Henan Hongxing Mining Machinery Co., Ltd. is a joint-stock enterprise in Zhengzhou of China which is called the famous mining machinery brand in China. Recent years, we make great achievement. For further development, we always persist in implementing the strategy of improving the competition ability of our products,relying on strong R&D team, keeping forging ahead in an innovative way, aiming at the forefront of technology, and constantly updating the HI-TECH innovation capability of the corporation.

We are always insisting on international advanced technical cooperation and communication, and introduce advanced technology from Germany, Swedish, Finland, and make digestion and absorption to improve our products' quality continuously. We keep the service idea of 'win-win cooperation and create more value to customers', with the times, persist in innovation to provide the high quality products, global service and advanced technology support for our customers.

In cases, we design and manufacture mobile crushing plant which brings new life to the construction waste.

As the rapid development of society, the fundamental Infrastructure has gradually expanded the scale .The old things are being replaced by the new one, especially the concrete buildings and the comparatively narrow roads. In this process, more and more construction wastes are produced, and in the last time, these building wastes were transported to the area far away from city, or just thrown away everywhere, polluting the environment.

However, in these days, these things have their new function instead of just the construction waste. They are transferred into the construction aggregates just at the working site, and through the first crushing, secondary crushing, sometimes needs the tertiary crushing process, and the screening, sometimes may need grinding, the final products can be transported to the construction site directly.

It is the mobile crusher plant that brings all these changes. It is designed to help the customers change the working site conveniently compare to the stationary one. Nowadays the mobile crushing plant is being more and more popular in many aspects, say the ore mine, the waste process and so on.

And of course, it's not enough for future development and we are insisting our management theory and service spirit to make considerable progress.

25-02-2012 om 04:24 geschreven door annazhao356  

Cone crusher is suitable to crush various kinds of ores and rocks of medium or above medium hardness. Compare with jaw crusher, cone crusher is of stable structure, high efficiency, easy adjustment, economic operation, etc.

Spring cone crusher is cone crusher which is the earliest appearance in the world, and it is used widest and larger quantity crush mechanism at present. The Spring Cone crusher is generally used as a secondary crusher in a stone production line. The spring safety system of crusher acts as an overloading protection system that allows metal to pass through the crushing chamber so as not to damage the cone crusher. The safety system uses dry oil and water as two kinds of sealed formation to make plaster powder and engine oil separate to make sure reliable performance. The type of crushing chamber depends upon size of feeding and fineness of crushed product. The standard type (PYB) is applied to medium crushing, the medium type is applied to medium or fine crushing and the short head type is applied to fine crushing.

With the development of the series of spring cone crusher, its structure is more perfect than before and the technology parameter is more advanced, so these crushers have excellent performance in the aspects of manufacture, installation, use and maintenance etc. The spring cone crusher belongs to the cone crusher, in the stone production line, there are some other crushers such as jaw crusher, impact crusher, vibrating feeder and vibrating screen.

Spring cone crushers are widely used in industries like metallurgy, construction, road building, chemistry etc, to crush many kinds of mid-hard or hard rocks and ores such as iron ore, limestone, granite, basalt, quartz etc. The standard spring cone crushers are used for secondary crushing; the medium ones are used for fine crushing; and the short head ones are used for super thin crushing. The spring cone crusher is characterized by a reliable structure, high efficiency, easy adjustment and economic. The spring safety system prevents overload so that hard materials (such as iron) are processed through the crushing chamber without damaging the machine. Spring cone crushers are run on belt drives driven by an electric motor or diesel engine. Cone crushers are used extensively throughout the aggregate and mineral processing industry.

The working principle of spring cone crusher: spring cone crusher crushes materials by the working surface between the movable cone and fixed cone. So spring cone crusher is more advanced and efficiency. The movable cone is supported by spherical bearing and fixed on an hanging vertical shaft which is set in the eccentric sleeve, and the sleeve is set on the stopping and pushing bearing. The movable cone and vertical shaft are driven by the eccentric shaft sleeve together. The eccentric shaft sleeve is driven by horizontal shaft and fimbriated gear, and the wheel of the conveyor belt is driven by motor through v-belts. The lower part of vertical shaft is installed in the eccentric sleeve. When the eccentric sleeve rotates, there is a conical surface lined out by the shaft. When the movable cone comes near the fixed cone, rocks are grinded into pieces, when the cone leaves, grinded materials is discharged from the discharge hole. The fixed cone can be ascended or descended by adjusting setting to adjust the width of discharge hole, consequently the output size is determined.

Compared with jaw crusher, spring cone crusher has the advantage of low operation costs, high productivity, easy adjustment and stable structure. The spring cone crusher has higher capacity and the products with high quality. Because spring cone crusher has safety device, the parking time has been reduced greatly. The machine is cast steel structure and on the heavy load pat equip with dabber. The spring cone crusher equips with adjuster, it can adjust the discharge particle size to meet different demands. The spring cone crusher has a whole lubrication system, it can self-close once the oil temperature is too high or overflow. The inner structure of spring cone crusher has good sealing property. This will protect spring cone crusher from damage of dust. Spring cone crusher has long using life and high applicability. This spring cone crusher can be equipped with other equipments in the stone production line or sand making production line.

25-02-2012 om 04:23 geschreven door annazhao356  

The VSI sand maker machine made sand is made of river cobble and cobblestone, and processed by crusher machines and VSI sand makers, or other accessory equipments. This artificial sand can replace the natural sand, and even much better for construction than the natural sand.

Henan Hongxing is a manufacturer who produces the VSI sand makers based on the various processing requirement as well as the sand particle size, VSI sand maker can further meet the day-to-day needs of mining operating location. The VSI sand maker is broadly employed within high way, railway transport, water conservancy as well as other sectors. This VSI sand maker is suitable for metal and nonmetal ore, construction material, artificial sand as well as other types of metallurgy slag. This VSI sand generating machine is used inside the brittle material using the moh’s hardness much less than 9 degree, it not suitable for the viscous material or the stone material with a lot of soil.

Based on the above, it's the issue that how to choose the correct and proper VSI Sand Making Machine.

From the technological requirement, sometimes people just require the maximum particle size limited value, the fine powder can not exceed the limited value. Sometimes people not only require the particle size, but the particle shape. So the requirement of VSI sand maker is also strictly. For example, as the concrete aggregate, there is not only requirement on the product particle size, but also require the particle shape must be cubic. It is better with edge angle, this can promote the strengthen of concrete. In the sand making production line, the products particle size must be ensure by the third generation sand making machine-VSI high efficiency sand maker. As used for steelmaking material, limestone particle size must be controlled in a certain range, and not or less produce the powder.

In addition, the main consumption of VSI sand maker, inside the crushing plant, besides the typical wears of VSI sand maker, electric energy, steel consumption, lubrication, water and rubber belt are the primary consumption aspects. The consumption volume is distinct according to the ore constitute, mine sort, hardness, crushing flow and crushing ratio. So to be able to minimize power consumption, inside the crushing plant, folks should boost the processing capacity of each stage, reduce the VSI crusher empty operation to achieve the best economy benefit and lower the unit consumption.

Henan Hongxing connects the informatization technology and improved the work efficiency to solve the VSI sand makers problem, this promoted the VSI sand maker crushing ratio and reduced the wear and energy consumption. At the present condition of economic development, the VSI sand makers will have high use value in the mining machinery industry.

25-02-2012 om 04:23 geschreven door annazhao356  

With the gradual improvement and promotion of the steam engine and electric motor power machinery ,various crushers have been invented. After several improvements, the crushers have become what we are using now. with the requirements of the people, crushers will be further changed, then let us review the crusher history.

In 1806,steam-driven roll crusher appeared.In 1858,American EW Black invented the jaw crusher.1980s,a large jaw crusher’s material size(average diameter of abrasive)which can crusher 800 tons of material per hour had reached about 1800mm.In 1878,American Charles Brown invented the gyratory crusher with continuous work.The Gates Iron Works sold its first gyratory crusher Chicago in 1981.In 1953,U.S.Allis-Chalmers gyratory crusher hydraulic launched.The early 1970s,large gyratory crusher has been able to handle material per hour,5000 tons,the maximum size up to 2000mm.The late 1970s,the U.S.launch of super-heavy company Rexnord gyratory crusher.80 years,Sweden has introduced a new top Morgards Hammer gyratory crusher hydraulic cy linder.In 1984,China successfully developed the 1200 light-duty hydraulic gyratory crusher.

In 1858, American EW Black invented the jaw crusher. 1980s, crushing 800 tons of material per hour, a large jaw crusher feed size (average diameter of abrasive) has reached about 1800 mm.

In 1878, American Charles Brown invented the gyratory crusher withcontinuous work. The Gates Iron Works sold its first gyratory crusher Chicago in 1881 .In 1953 ，U.S. Allis-Chalmers gyratory crusher hydraulic launched. The early 1970s, large gyratory crusher has been able to handle material per hour, 5000 tons, the maximum size up to 2000 mm. The late 1970s, the U.S. launch of super-heavy company Rexnord gyratory crusher. 80 years, Sweden has introduced a new top Morgards Hammer gyratory crusher hydraulic cylinder. In 1984, China successfully developed the 1200 light-duty hydraulic gyratory crusher.

In 1895,the United States William invented a low energy impact crusher.In 1920,theoriginal design by the Americans Simmons brothers began to be used cone crusher concentrator.In 1948 the company developed into a U.S.AC hydraulic cone crusher.70 years for the development of control hydraulic cone crusher automatic controller.

In 1924,the Germans developed a crusher,its structure is similar to a modern squirrel cage crusher,1942,German Andreson on the basis of previous experience,and the invention of modern crusher structure similar AP series impact crusher,crusher of the kind of the kind after the Second World War(1945)appeared in the market.

Nowdays,the development of crusher is rapid,let us share some new crushers. Crushers includes many different types such as jaw crusher, cone crusher and impact crusher as well as vertical shaft impact crusher which is also called sand making machine. In addition, mobile crusher is also an important machine which is suitable for small miners. Symons crusher and HP series cone crusher are suitable for high hardness stones and varies minerals. Generally, whole crushing plant contains primary crusher, secondary crusher and tertiary crusher as well as some auxiliary machines such as vibrating feeder, belt conveyor and vibrating screen.

25-02-2012 om 04:23 geschreven door annazhao356  

Most ores contain less than 10% lead, and ores containing as little as 3% lead can be economically exploited. Ores are crushed and concentrated by froth flotation typically to 70% or more. When lead is exploited to the ground, it’s should be crushed or grinded for its further application. Lead ore crusher will act as the primary crushing equipment in lead ore crushing plant So now the PEW sequence of Jaw crusher has most unquestionably change to the earth most welcome crusher .And you might make your mind up upon the PEW sequence of jaw crusher while using earth superior crushing and production solutions as quickly when you desire to crush the products featuring very hard and big erosion.

We can supply many lead ore curshers such as lead jaw crusher, lead impact crusher, lead cone crusher, lead mobile crusher and so on. Metallic lead that results from the roasting and blast furnace processes still contains significant contaminants of arsenic, antimony, bismuth, zinc, copper, silver, and gold. Lead ore crushers are used widely in such ore curshing industry. Since the establishment, Hongxing has grown to become the largest crusher and screening equipment dealer in the China. So, if you want some lead ore or other ore mining equipments or crushing machines, you can come to visit Hongxing which must be your good choice.

Lead oxide from the roasting process is reduced in a coke-fired blast furnace.[6] This converts most of the lead to its metallic form. Three additional layers separate in the process and float to the top of the metallic lead. These are slag (silicates containing 1.5% lead), matte (sulfides containing 15% lead), and speiss (arsenides of iron and copper). These wastes contain concentrations of copper, zinc, cadmium, and bismuth that can be recovered economically, as can their content of unreduced lead.

Metallic lead that results from the roasting and blast furnace processes still contains significant contaminants of arsenic, antimony, bismuth, zinc, copper, silver, and gold. The melt is treated in a reverberatory furnace with air, steam, and sulfur, which oxidizes the contaminants except silver, gold, and bismuth. The oxidized contaminants are removed by drossing, where they float to the top and are skimmed off.

Lead hammer crushers are widely used in small quarries with small capacities. That’s because in such situation, the cost and the difficulty of changing and maintaining worn hammers are more acceptable to the quarry owners. However, once the quarry owners want to enhance the capacity to above 50-60t/h by one crushing plant, hammer crushers are no longer suitable. Using hammer crusher to do a big crushing work will lead to a passive situation .

25-02-2012 om 04:23 geschreven door annazhao356  

As is known to all, production of main raw material is limestone cement. In the most ordinary staple stones, use the equipment is mainly a counterattack crusher. Refers to the cement production process two materials according to certain proportion into a counterattack crusher for broken production process. Common mixed broken with mud limestone, a limestone with limestone and clay shale and limestone.

Mixed broken succeed, can reduce or exempt the dissection, elongate-shaped limestone ore resources more fully. Two kinds of raw material processing reduced together a set of processing system construction and operating expenses, cement mixed crushing process to ensure the grain-size meet the requirements of the grinding, prevent crusher cavity jams, ensure the smooth operation of the system. Therefore, the whole system from bunker up will be special design, including the shape, structure, the broken silo before group, the mud inside and funnel chop special treatment and chute, etc.

The rotor is crusher 'heart', and is also the most restrictive impact breaker acceptance of parts, which in the work plays a vital role. So the company developed and produced structure solid heavy rotor to obtain higher rotation inertia. High wear-resisting material and the best crushing cavity, making the performance of the crusher epic. By hydraulic impact breaker crushing technology bring the mixture in the process of advantage: broken by wet limestone broken material feeding package, dust reduce, formation of crushed stone and wet earth asphalt-measuring viscosity decrease, liquidity increases, reducing valve with the congestion, with belt conveyor in transport and stacking prehomogenization in the performance of stocks and rake take.

Hydraulic impact breaker is very suitable for crushing various soft and hard ore in, crushing, crushing, finely assignments, slag, gangue, coal ash of materials, such as cooperate mandibles crusher, impact crusher etc processing, can replace limestone, produce cement. A sticky soil high aluminium material and industrial waste residue (such as slag, fly ash, coal gangue) as main raw materials, add 5% of special additives, sintering temperature just 700 degrees Celsius, the energy consumption only ordinary cement 1/2 geological polymer cement new technology, this kind of cement don’t need limestone, fuel consumption is small, can reduce 50% coal burning, so dust and gas, and reduce the amount of waste materials, the cement is 50% la discount strength label is ordinary cement 2 ~ 3 times, such as used in building roads just half the thickness. In this year of cement building roads, can save considerable funds. No crack is the cement another big characteristics. Because no gesso, in fire not blowout, can be used .

25-02-2012 om 04:22 geschreven door annazhao356  

As we all know, jaw crusher discharge mouth (row mouth) is mine according to the needs of user can be adjusted for qualified product material size. And also at first, we must konw the knowledge of jaw crusher thrust board.

The jaw crusher thrust board, also called cubits board, in addition to transfer power to and fro dynamic jaw plate do outside, but also has a safety insurance effect, changing its length also can rise to adjust the role of ore mouth platoon.

When jaw crusher crushing cavity things (such as crushing in an iron ball, iron, etc.), for the protection of the equipment is mainly parts are not damaged and use as crusher insurance after thrust board components. With cast iron plate after general thrust moulds overall, in which a trough of some holes open or to lower the cross-section intensity; Also can cast two, then use screws (or rivets) of connecting thrust board, combined. When not broken objects into crushing cavity, equipment overloaded and huge breakage force to thrust plate lead to thrust board broken or combination thrust board screw, machine cut to stop work, have insurance effect.

These knowledge may use the specifications in equipment not spoken so detailed, so the user in the purchase equipment, installation debugging must be to learn more, experts crusher grasp the jaw crusher of insurance and the material adjustment, to better the stable production.

Along with the continuous abrasion gear plate, ranking ore mouth bigger product constantly coarsens, in order to obtain qualified product size, need regular adjustment row ore mouth size. Row the adjusting methods of the ore mouth basically has the following two:

1, gasket adjustment, namely the bearing seat behind thrust board with frame behind after a group of gasket placed between wall, increase or decrease gaskets quantity or changing its thickness, can achieve the purpose of adjusting row ore mouth. This compact structure, regulating and reliable, large and medium-sized jaw crusher multi-purpose the regulation method.

2, wedge block regulation, it is to use on thrust board with frame between the backseat two wedge block adjustment is suitable for small crusher adopted

25-02-2012 om 04:22 geschreven door annazhao356  

As we all know, jaw crusher discharge mouth (row mouth) is mine according to the needs of user can be adjusted for qualified product material size. And also at first, we must konw the knowledge of jaw crusher thrust board.

The jaw crusher thrust board, also called cubits board, in addition to transfer power to and fro dynamic jaw plate do outside, but also has a safety insurance effect, changing its length also can rise to adjust the role of ore mouth platoon.

When jaw crusher crushing cavity things (such as crushing in an iron ball, iron, etc.), for the protection of the equipment is mainly parts are not damaged and use as crusher insurance after thrust board components. With cast iron plate after general thrust moulds overall, in which a trough of some holes open or to lower the cross-section intensity; Also can cast two, then use screws (or rivets) of connecting thrust board, combined. When not broken objects into crushing cavity, equipment overloaded and huge breakage force to thrust plate lead to thrust board broken or combination thrust board screw, machine cut to stop work, have insurance effect.

These knowledge may use the specifications in equipment not spoken so detailed, so the user in the purchase equipment, installation debugging must be to learn more, experts crusher grasp the jaw crusher of insurance and the material adjustment, to better the stable production.

Along with the continuous abrasion gear plate, ranking ore mouth bigger product constantly coarsens, in order to obtain qualified product size, need regular adjustment row ore mouth size. Row the adjusting methods of the ore mouth basically has the following two:

1, gasket adjustment, namely the bearing seat behind thrust board with frame behind after a group of gasket placed between wall, increase or decrease gaskets quantity or changing its thickness, can achieve the purpose of adjusting row ore mouth. This compact structure, regulating and reliable, large and medium-sized jaw crusher multi-purpose the regulation method.

2, wedge block regulation, it is to use on thrust board with frame between the backseat two wedge block adjustment is suitable for small crusher adopted

25-02-2012 om 04:22 geschreven door annazhao356  

In recent years, high-speed railway construction is in rapid development, whose construction requires a lot of sand and concrete aggregate materials. According to the new operating indicator, the requirement on the gradation and shape of sand and concrete aggregate materials is higher, which is nearly close to the international standard.

Crusher has become one of the most important industries after the rapid development these years, and more and more people pay close attention to it. The technology of crusher is becoming mature gradually. From introduce foreign technology to produce advanced crusher, this process indicates that our technology of crusher producing has been enhanced greatly. For high-speed railway construction crushers make great contribution. For example, the impact crusher.

Impact crushers are often used for the coarse crushing, intermediate crushing or fine crushing of limestone, coal, carbide, quartz, dolomite, iron pyrite, gypsum, industrial chemicals and other below medium hard brittle materials. Impact crushers adopt the latest manufacturing technology and unique structural design. The finished products are with the cubic shape without tension and crack. They can crush various coarse, medium and fine materials (granite, limestone, and concrete, ect.), whose feed size is not more than 500mm, and compressive strength not more than 350MPa. And they are widely used in various ore crushing, railway, highway, energy, cement, chemical and construction industries. The particle size can be adjusted, and the crushing specifications are diversified. Through the test of hundreds of projects and constant improvement, the impact crushers produced by Henan Hongxing with superior quality and exquisite workmanship, are the essential equipments for the high-speed railway construction.

Crusher has a tendency of international. Recent years, the export volume of crusher is larger and larger, and the range of export is more and more widely. Now more and more foreigners begin taking notice of our crusher.

Also, the crusher industry has the characteristics of environmental-friendly and industry concentration. The manufacturer should hold the development trend of crusher exactly to have a better development.

25-02-2012 om 04:22 geschreven door annazhao356  

Global mining firms are unearthing ingenious solutions to grapple with shortages of workers and equipment amid the commodities boom, recruiting retired miners and buying cut-rate equipment from China and Russia, executives said this week. 'We hired some guys out of retirement, that was the only way to survive and get the skills in place,' said Pekka Pera, chief executive of Talvivaara, a Finnish firm building a new nickel and zinc mine.

Mining firms innovate to cope with labour and equipment shortages Eric OnstadMining firms, trying to cope with shortages of skilled workers and equipment, have been forced to innovate and adopt new solutions, rehiring retired mineworkers and buying cheaper equipment from China and Russia.

Different mining firms in different countries have various methods and policies.

Pera and other executives told the Reuters Global Mining Summit the key was taking advantage of local situations to surmount obstacles thrown up by a global rush to build new mines as metal prices soar to fresh peaks.

The Finnish firm realised that the depressed region around the mine had a lot young untrained and unemployed people, but also a number of retired miners.

Training and keeping workers was the biggest challenge for Major Drilling Group, one of the world's biggest mine drilling companies, Chief Executive Francis McGuire said.

'It takes three to five years to train a driller and it is a very, very skills intensive industry,' he said.

On the equipment side, Peter Hambro, executive chairman of the Russian gold producer that carries his name, said his firm had slashed costs by local purchasing.

The tyre situation has improved, but a lack of them was one reason behind a fall in production last year at the world's biggest diamond mines in Botswana, said Sheila Khama, the head of De Beers in that country.

Right now, big shortages and long lead times were being seen in mills, said Peter Marrone, chief executive of Canada's Yamana Gold.

His firm managed to keep expansion projects on schedule by ordering mills even before the board had formally approved building the new mines.

25-02-2012 om 04:22 geschreven door annazhao356  

Construction waste recycling is to different crushing equipment, screening equipment, transmission equipment and equipment to remove impurities with a reasonable production assembly process.

Construction waste in many of the waste by sorting, removed or crushed, most of them can re-use as a renewable resource. Such as scrap steel, scrap wire, scrap wire and other metal by sorting, concentration, re-melted, it can be processed into all kinds of steel; waste bamboo, wood can be used to make artificial wood.

If enterprises can reuse and recycle construction waste well, the crushing equipment productivity must be pushed forward. Of course, in addition to this aspect, influence of crushing equipment productivity there are many factors, including internal and external factors, internal is broken, the functions and characteristics of mechanical itself is material properties outside influence. Specific as follows:

1) material of hardness. The more hard material broken up, and the more difficult for equipment wear and tear the more serious. Broken slow, of course, crushing small ability.

2) materials, namely material containing the humidity of moisture is bigger, within easy adhesion material in crusher, also easy to next material transporting process jams, causing broken ability decrease.

3) crushing the fineness of materials, high fineness requirement, which requires broken out of the fine, the material crushing ability and smaller.

4) material composition, the broken in the former materials containing powder more many more influence, because these fine powder crushing to affect delivery. Adhesion For fine powder content more should advance once sieve.

5) material viscosity. Namely material viscosity, the bigger the more easily adhesion.

6) crushing equipment broken pieces (hammer) wear resistance, the better broken, the greater the if not wear-resisting ability will affect the crushing ability .

25-02-2012 om 04:22 geschreven door annazhao356  

The advanced technology is the main factor of development, the development in China of the urban and rural is a kind of solidarity, they are promoted each other and influenced each other. While the R & D of new sand making machine will make the township economic in our country develops rapidly. New sand making machine is one of the ideal equipment producing mechanism sand, cushion material, asphalt concrete and cement concrete aggregate. Which is widely used in highway, construction and other fields and called new sand making machine for impact crusher. New sand making machine is grinding and crushing materials by the material mutual collision and friction between materials, therefore it is suitable for the coarse and hard crushing of hard, medium hard and abrasive materials.

Sand making machine is the equipment which makes sand artificially. It can be impact crusher or cone crusher according to the materiel condition and production requirement.

In the working process of the new sand making machine, a swirling crushing chamber is particularly important; the structure shape of the swirling crushing chamber structure shape is a annular space composed by the upper and below two cylinder. The crushing of the materials proceeds in swirling crushing chamber and the crushing effect is limited to the materials, which can play a role of to wear resistant as a lining; the observation hole is used for observing the wear pattern of the wear-resistant block in the impeller emission outlet flow passage and the linear at the top of swirling crushing chamber, the observation must be strictly sealed when the machine works; the distributor is fixed to the upper cylindrical of the swirling crushing chamber; when the impeller rotates at high speed, it will generate air flow which will through the distributor in swirling crushing chamber and the impeller forms internal self circulation system; at last the fine material will discharge out from the opening.

The sand making machine is especial suitable for making building sand and paving sand. Because of its low wearable feature, sand making machine is also used in high abrasiveness and secondary crushing industry. Besides, because there is no pollution for machine, sand making machine is well suitable for producting glass quartz sand and other high purity material industry. Its production capacity scopes is 10-500t/h., so sand making machine almost can satisfies all production requirement.

With the continuously development of Chinese economy, the machinery industry has continued to expand and the machinery is widely applied to large-scale construction, believe that after many years' experience in the mineral processing equipment production areas, we will provide more perfect and excellent performance sand or gravel production line for the market. I believe that in the near future China's development will be more quickly, rural development will make a spurt of progress.

24-02-2012 om 03:47 geschreven door annazhao356  

A computer simulation, a computer model, or a computational model is a computer program, or network of computers, that attempts to simulate an abstract model of a particular system. Computer simulations have become a useful part of mathematical modeling of many natural systems in physics (computational physics), astrophysics, chemistry and biology, human systems in economics, psychology, social science, and engineering.

It is from the last century that people from foreign country had optimized the structure and cavity of the jaw crusher by the computer simulating technology, they had developed the new jaw crusher with characteristics of no plug point, low height, light weight, good product particle, high yield, high performance and low power consumption, which thereby greatly improved the performance of the jaw crusher, shortened the developing cycle of product and improved the competitiveness of the product in the market. However, the simulating optimization design of the jaw crusher in China was mainly limited to the specific models of jaw crusher to prepare the corresponding procedure to optimize the design. And these procedures are mostly with little reusability, which can only solve the specific issues of particular jaw crusher. However, the optimized content of a crusher changes frequently with different requirements of different customers, so the simulation optimization design work needs large repeated and cumbersome programming work, which is time-consuming and laborious as well as extends the developing cycle of the product.

Jaw crusher is widely used in mining, metallurgy, building materials, highway, railway, water and chemical industries. Among them some large and medium-sized the jaw crushers are the main products. Especially in designing and producing large jaw crusher, we has been a leading level at home and abroad. Try to use the advanced design tools of kinematics and dynamics simulation to have a rapid development of the new jaw crusher and to have a simulating optimization design of the mechanism design parameters, which greatly reduce the workload of the simulation design, shorten the product development cycle and improve the reusability of the simulating model. To optimize the jaw crusher by the use of simulating technology, the main task is to optimize the feeding, discharging horizontal and vertical stroke and stroke characteristic coefficient of a jaw crusher.

Computer simulations are used in many fields, including science, technology, entertainment, health care, and business planning and scheduling. With this high technology, we believe that our mining equipments will get better performance.

24-02-2012 om 03:47 geschreven door annazhao356  

The bearing of general large jaw crusher mainly uses the open sliding bearing. The bearing liner is mostly made of Babbitt alloy, the scraping technical of this kind of bearing has a higher requirements. If the scraping is not good or gap adjusted improperly, there can cause burning watt accident.

In process of replacing the bearing of large jaw crusher, we should pay attention to the following points:

A. What should we do when remove the old watt of jaw crusher.

(1) Measure the thickness of the old bush joint surface gasket.

(2) Measure the levelness of the spindle.

(3) Examine whether the spindle is smooth or not, and whether it with the defects of rust, bumps and so on or not. If the situation is exist, you should to eliminate it.

(4) Measure the of the bottom clearance, backlash and end clearance of the bearing bush.

B. Testing of the contact of the watt-back with the bearing of the jaw crusher.

In order to prevent happening of the reverse sliding and rotating between the bearing bush and the bearing pedestal when the equipment operation, it generally adopts the pin, sleeve positioning mode.

C. The techniques requiring of the scraping the bearing bush.

Spindle scraping should meet the required standards of technical.

D. Scraping and grinding the spindle bush.

The scraping is generally divided into rough scraping, fine scraping and refined scraping three processes.

E. The measurement and the adjusting method of the bearing clearance.

Reasonable adjust bearing clearance is an important issue, it must meet specified standards

The general adjusting methods include: top clearance adjusting and measuring methods, side gap adjusting and measuring methods, the axial clearance measuring method.

F. The assembly and test.

When assemble the jaw crusher, clean the bearing bush, shaft, oil collector and lubricating oil pipeline at first. Then assemble the main bearing, connecting rod and other components. When testing, actuate the pump, and ensure the amount of fuel supply slightly bigger than that of normal operation. As in the process of testing does not appear the phenomenon that the temperature is elevated and the current significantly increased, that proves the success of the overhaul, then the equipment can be used normally.

24-02-2012 om 03:47 geschreven door annazhao356  

In the course of operating jaw crusher, sometimes the jaw crusher parking condition can be met suddenly. At this time, if the operator can not find the reason of jaw crusher parking and repair it immediately, the greater damage will be caused and all of stone product must be forced stop operation, so the abnormal jaw crusher parking will bring great loss for enterprise. Well, why the jaw crusher parking and how to deal with this situation are very important.

(1). In the process of jaw crusher operation, some workers will keep adding to the ore material to feed the inlet. As a result, the feeding material will be more than the carrying capacity of the machine, it will cause a blockage of the inlet. The jaw crusher parking will happen in this situation, the operators must clean up the crushing cavity before restarting, and evenly feed the material to avoid jaw crusher parking.

(2). Jaw Crusher is transmitted power by the drive belt, so if improper belt tension will cause jaw crusher parking. So the belt should be checked before you start the machine each time to see if the under belt is appropriate.

(3). Timely check up all the bolts of jaw crusher machine, the loosen bolts also can cause jaw crusher parking in the course of operation.

Here, we also introduct some preparation work before using jaw crusher.

(1) double-check whether good lubrication of bearings, thrust plate connections have enough grease.

(2) carefully check all fasteners are tightened.

(3) Carefully check the belt is good. If there is breakage, should be replaced when the belt or pulley on the oil, the oil rag and wipe applications.

(4) Check the protection device is good, that there is insecurity, should be immediately removed.

(5) Check whether the ore crushing cavity or debris, or debris if the ore, then must be clean to ensure crusher cavity start.

(6) Check whether the return from the top bolts, gaskets group is pressed, T-bolts are tightened.

24-02-2012 om 03:46 geschreven door annazhao356  

The vibrating screen installation and debugging is important for the vibrating screener users. If can influence the working life of vibratory screen and the quality of final products. So the installation and debugging played an important role in course of vibrating screen operation. So today we will talk about the vibrating screen installation and debugging in order to make the user know more about the vibrating screener working.

1) Pre-installation preparation

The new equipment, vibrating screen prior to installation, should be carefully scrutinized. As the manufacture of finished goods inventory piling up a longer time, such as rusted bearings, seals, aging or damaged during handling and so on, faced with these problems need to be replaced new parts. Also, as exciter, and the factory for rust-proof, injection of anti-rust oil, formally put into operation before the replacement into lubricating oil.

Instructions should be read carefully before installation, make full preparations.

2) The installation

(1) installation of supporting or hanging device. Installation, to foundation leveling, and then supporting or hanging device in accordance with parts drawings and installation diagram sieves, in order to install the components. Spring-loaded before the end-tag should be the actual stiffness values matching.

(2) sieve box connected to the supporting or hanging device. Bottles and later, should be required to adjust the angle. For the hanging of the sieve, it should also adjust the screen angle and screen box spindle box level. The general level of first-degree horizontal adjustment to eliminate the screen box deflection. Levels after correction, and then adjust the vertical inclination of sieve box. Vibration isolation spring force should be uniform, which could force the situation by measuring the amount of spring compression to judge. General, two sets of feed-side of the compression spring to be the same two sets of springs discharging side should also be the case. Nesting side and feed side may be differences in the amount of spring compression.

(3) installation of electric motors and the triangle tape. Installation, leveling should be based on the motor, motor level of need for correction, two tape round the corresponding grooves of the center line should coincide, triangular tension dictate the appropriate tape.

(4) required to install and fixed-screen surface.

(5) Check the connection sieve components (such as the sieve plate, exciter, etc.) a fixed situation, screen should be uniform tension, in order to prevent the generation of local vibration. Check the transmission part of the lubrication conditions, the motor and control box wiring is correct, and the rotation transmission part of the hand to see whether it is normal operation.

(6) Check the entry sieve materials, discharge chute and the funnel at work the next screen whether a crash.

3) Commissioning

Screening machine installed, commissioning should be empty, the initial check installation quality, and make the necessary adjustments.

(1) shall not be less than the sieve empty commissioning time 8h. In this time, the observation of sieve quickly whether to initiate a smooth, vibration and stability of operation, no special noise amplitude by the amplitude to observe its compliance with licensing requirements.

(2) The sieve operation, the vibrating screen box should not result in yaw. In case of yaw, which may be due both sides of the spring height difference is too large, hanging rope pull uneven rotation axis is not horizontal or triangular tape too tight, should be adjusted accordingly.

(3) driving 4h, the bearing temperature is rising, and then remained stable. The maximum temperature does not exceed 75, temperature should not exceed 40.

(4) If abnormal noise or driving after a sharp increase in bearing temperature should be immediately shut down, check whether the rotation axis is a flexible and well lubricated and so on, until after the start troubleshooting.

(5) 2-4h after driving down to check whether there are loose connection parts, if there are loose, tighten until after the drive.

(6) 8h after the test if no failure, only the installation of project acceptance.

24-02-2012 om 03:46 geschreven door annazhao356  

The ball mill noise control is to control the noise output of the ball mill in the process of crushing materials by the engineering measures and is also to control the spread and receive of the noise,which is in order to reach the required acoustical environment.

Strong vibration and noise will be produced when the ball mill crushes materials and the noise can be up to about 100 to 115 dB (A),which does great harm to the operation workers and the surrounding environment.

If you want to control this noise of ball mill, the selection and application of ball mill sound insulation is important.

The ball mill sound insulation enclosure though no typical heat source, but cans in the collision of Jane long-term friction also can produce certain quantity of heat, also need to ventilation cooling. So the top cover open a vents and matches the muffler. The lower end plate and cover between shaft have crack, lie between the subglottic also often open, don't have to put wind path. This kind of equipment is to heat, the natural ventilation cooling way is enough. The cover of the structure of ball mill for assembly type, the first ball mill around erection channel steel skeleton, and then it into pieces of the cover wall plate assembly in successive skeletons. The upper portion of the cover plate for tile form, all assembly method for bolt coupling fixed, so in the equipment can be easily removed when the overhaul the sound insulation cover.

For convenience of homework personnel, in the sound insulation cover body is equipped with 8 group published two groups and the sound insulation window. The group of five for personnel to enter the laryngeal mask for ball mill in related to the operation with, the upper two equipment maintenance special door and a note oil lubrication with little door. Except through the sound insulation window lighting outside, enclosure also equipped with lighting facilities. Since it is the local sound insulation cover, there is part of the equipment in the hood, there is a cover body and the original equipment, the combination of between. Cover board and equipment should be sealed tight between fixed position. The problem is turning parts of the body and cover with more difficult, the rotation axis to cross the ball mill sound insulation cover the board, shall keep a circle gap here. Aperture neither too big. To avoid missing voice sound insulation effect influence; But neither is too small, so as not to cover plate and contact friction between the axis.

Sound insulation cover wall the composition of the board from inner to outer is as follows: 3 RRN thick plate, 6 nm thick drain clear stone cotton lint damping layer, 10 (~ en thick rock wool sound-absorbing board, spun glass cloth and 1 mm thick, perforation rate 30% of the principal part of the perforation panel. Cover plate thickness of the total for 11 firm. In the ends of the cover because of the self-contained tank tube end of the gap between less than 100 ram, cover board and not allowed and rotation tank have a contact, and therefore the place between the cover thickness for five (krma. Close to the shaft of the site because operation requirements often remove cover board, so this part of the cover plate is 4 ding m thick panels, with handles, may at any time off. Provide brand products within: the ball mill, the rotary kiln, mineral processing equipment, the grate ball mill and super fine ball mill.

Noise control of ball mill is the most direct, the most effective, the most economic measure to reduce the sound source sound:' from the sound source control noise'. So reducing noise source noise is the development trend of the research on noise control of ball mill.

24-02-2012 om 03:46 geschreven door annazhao356  

The rotary kiln is a rotary calcining kiln (commonly known as rotary kiln), belonging to the class of building materials equipment. I produced the rotary kiln system is equipped with technological innovation in the system using the most advanced hydraulic block device using a high measurement accuracy of the metering piston pump, high-precision speed control valve, contact graphite block sealing devices and other domestic advanced technology.

Henan Hongxing made of excellent quality within the rotary kiln, divided into several kinds of preheating decomposekiln, please welcome the experts to the decomposition ofrotary kiln and explain, the characteristics of the evaluation of decomposing furnace points:

(1) the gas flow, gas into in two different ways: the kiln gas into the way, air into the way.

(2) material feeding the position of the point: jet fuel, feeding entrance.

(3) rotary kiln temperature decomposition.

(4) rotary kiln stove burning conditions of fuel.

(5) of the rotary kiln powder and the residence time of gas.

The cylinder of kiln is made by high quality carbon steel plate , cylinder and rotary department is supported by supporting device through tire. At the middle part of the cylinder Fixed a large gear , the rotation of cylinder is through speed regulating motor--reducer --pinion -- large gear. Materials is feeding through the preheater chute to the rotary kiln, because of cylinder tilt and slow rotation, material along the circumference side scrolling, meanwhile moved to kiln head along the axial, Materials has been preheated, decomposed, sintering, then become to calcined dolomite ,and discharging into the cooler from the kiln head. The gas or coal powder as fuel is burning through the burner, the heat will be transfered to material by the flame radiation, the heat convection, kiln brick conduction , etc, then material calcined into finished products.

Henan Hongxing Mining Machinery Co., Ltd. manufactures various equipments for whole set of stone production line, and provide complete technical support for customers. The whole production line consists of stone crushing line, powder making line, sand making line and ore beneficiation line. We design different production lines ranging 50 t/h to 500 t/h by combining different models of equipments also matching cone crusher, deduster, etc.It is widely used for crushing hard limestone, granite, basalt, gravel, metallurgic slag, etc or artificial sand making for hydroelectric power, building material, high way, city construction, etc. Different models of equipments are combined to meet different customers' demands according to different craft requirements.

24-02-2012 om 03:46 geschreven door annazhao356  

The coal vibrating screen manufactured by Henan Hongxing Mining Machinery has accessed to countrywide patents, and also the coal screen as critical coal preparing gear act being an critical function within the processing circulation of coal screening plant. The perfect coal screening equipment is extensively utilised in coal market large-scale, mechanization, continuous grading operation.

Our coal vibrating screen has several benefits: mild excess weight, low noise, small energy consumption, higher efficiency, lengthy provider life, basic construction, handy maintenance attribute, utilised the high wear-resisting and high hole and so on.

The coal vibrating screen is the main screening tool for coal dressing. The normal screening work is realized by vibration, this is determined by the characteristics of silo wall vibrators. But vibration is the root cause of noise, and the noise with high sound level and sound source has variety and complexity. How to reduce the coal vibrating screen noise is important in the coal dressing process. There are some measures in the following for reducing the coal vibrating screen noise.

1. Fasten all the parts of coal vibrating screen, especially the screen plate which need to be replaced regularly, to avoid the necessary vibration caused by individual components of coal vibration screen.

2. The punching plate should be replaced by polyurethane sieve or rubber sieve which has the features of modulus of elasticity is small and low impact noise. It can be equipped with anti-blocking device.

3. Add rubber sheet in the sieve box side,feeding and discharge port, which can effectively suppress high-frequency vibrations and reduce radiated noise.

4. Replaced steel spring with a rubber spring, to reduce the impact of coal vibrating screen.

5. Add the soft acoustic shield out of the excister. Between the inner and outer coat of the bearing to be damped processing, rolling of anti-blocking device bearings can be made into a hollow roller or adding damping material in the hollow rolling inside, this can reduce the bearing vibration and reduce bearing noise.

24-02-2012 om 03:46 geschreven door annazhao356  

Beneficiation Machinery Production Line is mainly consisted of Vibrating Feeder,Jaw Crusher,Ball Mill，Classifier, Magnetic Separator, Flotation Machine, Condensing Machine ,Spiral Separator and Drying Machine.

The main purpose of beneficiation equipments is long-term use, it is unnecessary for people to buy the most expensive mineral processing equipments, but be sure to choose the right. People should according to the beneficiation test process, combine with the process capacity and the field conditions to choose the processing plant design and choose the right mineral processing equipment. In the purchase of mining equipment, in the case of the price difference is not large, be sure to choose the beneficiation equipment with good quality, to know the production machine to stop one more day, it may bring loss of tens of thousands or even millions.

In different place, because the ore grade, mineral structure, mineral form, mineral occurrence, the size and other properties are different, so the ore beneficiation process and technical conditions are different, this determined that the applied mineral processing technology is differ from others. People must test their own ore quality and then choose the proper beneficiation equipments. And then determine the use value of mineral. People who want to invest in the mine, no matter how high-grade of the mine, the first thing is find out the geological reserves and better with geological detailed investigation report. To know the ore components is the first step to choose what kind of beneficiation equipments is suitable. The beneficiation equipments incluedes ball mill, shaking table and so on.

Henan Hongxing has a share holding company engages in providing services for mining and construction company as well as providing professional advice for building a factory.

All of them have implementation experiences in mining and construction project management. During the recent years, we have already undertaken assembly lines of different products for tens of big-scale multinational company and small-and-mid sized companies in China. And our staff receives business management courses in University at a regular time to obtain advanced management idea.

24-02-2012 om 03:45 geschreven door annazhao356  

Stone crusher also named rock crusher includes stationary crusher, portable stone crusher or mobile stone crusher, mini stone crusher, large heavy duty stone crusher, used stone crusher, etc. According to stone crusher application, it’s usually used to take as primary crushing machine or secondary crusher equipments in stone crushing plants, grinding mill plants, limestone crusher plants, rock quarry plants etc.

Stone crusher is used to crush these stones into small size or change the form such as limestone, quartz, marble, granite and recycle building waste materials such as debris, asphaltic cement concrete. Usually in stone crusher plant, we crush stones into small particles with diameter of 10mm, 12mm, 19mm, 25mm, 50mm, 100mm. According to the stone crusher usage, jaw stone crusher is used as primary crusher machine, when big stones are crushed smaller after jaw crusher, they are transferred to impact stone crusher or cone stone crusher for secondary crushing, then go through the stone shapping machine for getting cubic size. Using screening machine to screen out the suitable building aggregates, while the unsuitable stones return to the stone crusher machine for re-crushing.

The birth of a crusher, whose production process, is a little long. After its rough machining, modulation, fine machining, etc, an important step is doing beauty for crusher. What the consumer need is not only its high-tech feature, but its beautiful appearance. Henan Hongxing makes perfection more perfect in every step. And now we will analyze the appearance of crusher.

For cabinet of crusher, after its stress relieving, then it will be abrasive blasting. Through this step, the surface will be more smoothly. Even though it seems not essential, a good crusher manufacture will try its best to make the appearance more beautiful, meanwhile, the production cost will be higher. However, Henan Hongxing can make his consumer feel good vale. The abrasive blasting process is not just for crusher’s good-looking, but gaining in strength of paint.

23-02-2012 om 04:03 geschreven door annazhao356  

When the customers are going to buy the sand making machine, they will first to be asked that what kind of material. This is because the different hardness of material need different equipment, there will also have different production capacity in the future. The sand making machine which researched and developed by Henan Hongxing is used for highway, high speed railway, municipal, and other public infrastructure, and it is the first choice of artificial system sand and plastic field.

Sand making machine main features and benefits:

Simple structure and low operating cost; high efficiency and low consumption; has the function of fine crush and crude grinding; slightly influenced by the moisture content of material, and the max moisture content is 8%; more suitable for crushing mid-hardness and high-hardness materials; cubic shape of final products, high density of piling up and low iron pollution; more wearable and easy maintenance; low working noise and light dust pollution.

The pertinence advantage of sand making machine, take the cobble for example, some users directly choose crusher for the crushing of cobble to pave roads, but leaked the most important sand making machine, actually this is not correct. Based on too much users don't know much about the sand making machine while deal with too hard stone so they can't choose the suitable equipment, insiders of industry recommend, for the material such as cobble with higher hardness, users can choose the sand making machine. This equipment has unique advantage compare with the traditional equipment on the crushing of cobble; output capacity is 35%-50% higher than the traditional crushing equipment with same scale! And as renewal of the sand making equipment, the application scope of sand making machine becomes more widely, not only the concrete aggregate of civil engineering and the stable layer material of highway construction; they all need the strong support of the sand making machine.

The sand making machine can come to the fore in many mining equipment is not by chance, this is through a long process and summing up experience and crushing technology, condensed the essence of this industry. So it can say that the sand making machine is the best choice of the benefit advantages under the mode of new economic development.

23-02-2012 om 04:03 geschreven door annazhao356  

In recent years, though the sand making machine has experienced a fast development, questions still remains to be solved. For example, how to decrease the noise of sand making machine? In order to solve this problem, shunky’s experts have been focusing on it for many years and summarized the following solutions:

1. Do the self production to the workers near the sand making machine, they can wear earplugs, covers and other noise-prevention tools. At the same time, do the rotation work, thus it can shorten the workers suffering time from the noise of sand making machine.

2. Improve the craft level of sand making machine. Shunky’s sand making machine has a smaller noise than other supplier’s ones, usually it can decrease 34% on average.

3. Do the sound attenuation, absorption, insulation, isolation job to the sand making machine.

4. Control the spread of noise of sand making machine.

In addition, shunky is still working on decreasing the noise of sand making machine, which will be bound to have a better result.

Sand making machine working principle:

Stone enters sand making machine though conveyor belt. Stone is crushed by hitting other stones. Material falls down to impellor cavity. Under great centrifugal force, it hits material that coming downwards. After hitting each other, they force a vortex between impellor and shell, and hit each other several times, finally smaller stone comes out, and goes to vibrating screen.

Satisfactory material is transported to sand washing machine, however overlarge material will go back to sand maker to be refreshed. Output sizes can be made according to customers requirement. If input size is larger than the designed size, other crushing equipment will be necessary.

23-02-2012 om 04:03 geschreven door annazhao356  

Jaw Crusher is a primary crushing machine used for coarse crushing plant in stone quarrying and mine ore mining process. It has properties of large crushing ratio, even granularity, simple structure, reliable operation, easy maintenance, and low cost. So this kind of jaw crusher can be widely used in mining, metallurgy, iron ore, building material, highway, railway, water project, chemical industry, etc, for crushing various material with compression strength less than 320MPa.

Jaw crushers are equipped with one fixed and one moveable crushing jaw (moving jaw), both of which support crushing plates (wearing parts) in several versions. They form a wedge-shaped crushing zone. The walls of the crushing zone are made of replaceable wearing sheets. Crushing is done between the two crushing jaws. The moving jaw of the single toggle jaw crusher moves elliptically. A pendulum motion is being carried out by the double toggle jaw crusher.blake jaw crusher is is widely used in mining and quarry.

The crushing force is produced by an eccentric shaft. Then it is transferred to the crushing zone via a toggle plate system and supported by the back wall of the housing of the machine. Spring pulling rods keep the whole system in a condition of nonpositive connection. Centrifugal masses on the eccentric shaft serve as compensation for heavy loads. A flywheel is provided in the form of a pulley. Due to the favorable angle of dip between the crushing jaws, the feeding material can be reduced directly after entering the machine. The final grain size distribution is influenced by both,jaw crusher is the adjustable crusher setting and the suitability of the tooth form selected for the crushing plates.

The following is the process of jaw crushing plant:

The Big materials are fed to the primary jaw crusher evenly and gradually by vibrating feeder through a hopper for the primary crushing. After first crushing, the material will transferred to impact crusher or cone crusher by belt conveyor for secondary crushing; the crushed materials will then transferred to vibrating screen for separating.

After being separated, the parts that can meet standard will be taken away as final products, while the other parts will be returned to impact crusher, thus forming a closed circuit. Size of final products can be combined and graded according to customer specific requirement. We can also equip dust catcher system to protect environment.

Jaw crusher maintenance features finite element analysis technology, top manufacturing materials, higher crushing strength, simple structure, safer and convenient, which has greatly extended the bearing’s service life. Due to the tooth guard, the whole cast steel of the bearing seat has greatly improved the production, and have definitely occupied the leading position in our China’s machinery area.

23-02-2012 om 04:02 geschreven door annazhao356  

For some people, the concept of Routine Maintenance is like watching your diet or going to the dentist: Everyone knows they should do it—but sometimes it is easier just to put it off for a while. Among the wearing parts of crusher, the most easily damaged parts are its jaw plates. After buying equipment, the expenses on fragile replacement is also a bunch of spending. In order to improve the work efficiency and reduce unnecessary spending, lengthening the span life crusher’s jaw plate is particularly important.

There are two kinds of jaw plate used for jaw crusher: mobable jaw plate and fixed jaw plate. The movable jaw plate is made of high-quality cast steel. The precise machining and strict testing ensure that its high reliability and safety. The fixed jaw plate, like the movable jaw plate, is made of high-manganese steel, it’s designed symmetrically; so if one end is frayed, the other end can be used.

The eccentric shaft is made of forging steel, which is of high stength and rigidity. The bearing adopts four sets of the self-aligning roller bearing; it has a great loading capacity and auto self-aligning. The fly wheel and groove wheel are made of cast iron. Its weight and the structure can ensure the blance of the crusher.

In the production process, jaw plates of crusher hit the material directly, crushing force is very big, especially crushing the material with great hardness, lead to the nut becomes loose which install the plate, has great noise, makes the plate worn or intensified seriously even stops the crusher. In that case, concrete analysis according to the actual situation. Particular way is to make the spring on the crusher to be self-fastened device, put the device to wear in the bolt tighten the nut, because after the spring was pressing to a certain degree, they will create strong anti-vibration effect, the loose of nut on the crusher will tighten up by the action of self-fastened device, so not bolt looseness and prolong the service life of jaw plates. In short, it can figure out a way to solve specific problems in using process of crusher on specific conditions, and prevent the jaw plate loose, the wear is intensified, broken and so on, so as to extend the service life of jaw plate, reduce the cost, improve the working efficiency of the crusher.

While the crusher is working, the jaw plate directly contacts with material, bear enormous crushing force and friction with material, the service life of jaw plates directly related to the work efficiency and production cost of jaw crusher, therefore, it is a way for the survival of enterprise that is to extend the service life of jaw plate of crusher.

Only a qualified technician should carry out these maintenance steps. Should your jaw crusher require basic or full maintenance, make sure you let the experts handle your request. Remember, maintaining your assets correctly and timeously will save your company money in the long run.

23-02-2012 om 04:02 geschreven door annazhao356  

There are complete kinds of crushers, and how to position crushing ability of crushers? Due to different customers' demand and different practical situations, we can choose different crushers such as jaw crusher, impact crusher, hammer crusher, Hongxing cone crusher and so on. So how to position the crushing ability of crushers? The crushing ability of crushers means the amount of crushed materials in unit time, its unit is calculated by t/h. How many factors will affect the crushing ability? There are many factors to affect capacity of crushers:

a. The Hardness of Materials . If the materials are harder, it is harder to crush them and the abrasion of equipments will be more serious. It will cause lower speed of crushing and will definitely lead to smaller crushing capacity

b. The fineness of crushed materials . If the demand on fineness is higher or the crushed materials are requested to be finer, then the crushing capacity is smaller.

c. The viscosity of materials. It means if the viscosity of materials is higher, they are easier to be adhered together.

d. The better the abrasion resistance of crushing parts of crushers is, the bigger the capacity is, If they cannot resist abrasion, it will affect capacity.

e. Humidity of materials. It means if the moisture of materials is higher, materials are easier to be adhered inside of crushers and easier to be blocked in the process of delivery when discharging, which will cause capacity smaller.

f. The composition of raw material. If there are more powder contained in raw materials, it will cause more effect on crushing, because the powder are easy to be adhered to affect convey. Materials contain much powder should be screened in advance.

23-02-2012 om 04:02 geschreven door annazhao356  

Reusing these materials also lightens the load on our landfills. Examples of these materials include industrial co-generated materials such as fly-ash (from power generation industry) and blast furnace slag (from steel manufacturing).

And like concrete itself, old rebar is recycled into new. Incidentally, did you know that steel and concrete are among the most recycled materials in the world? The asphalt industry would have you believe asphalt is the most recycled material in the world, but the truth is that much of that recycling happens because asphalt pavements require complete demolition and reconstruction every 8-10 years.In sharp contrast, a comparable concrete pavement can easily last up to 40 years.

Concrete is made from granite aggregate, sand, cement, and water. While cement itself cannot be recycled, there has been increasing interest in recycling aggregate because of the environmental costs of mining the material and shrinking landfill space.

Concrete is an almost inert material.Because of its inert nature, but also because it cures to a solid form, it is ideal for using industrial by-products that otherwise would have been deposited in landfills. A stell mesh sunshaded box of a building in the dusty industrial estate of Kranji Crescent has been hosting a steady stream of visitors from China, Mongolia, Israel and France over the past four months.

Concrete is made from granite aggregate, sand, cement, and water. While cement itself cannot be recycled, there has been increasing interest in recycling aggregate because of the environmental costs of mining the material and shrinking landfill space. Currently, recycled aggregate is mainly used to line the bottom of roads and cast into road kerbs, rather than used in building structures, due to concerns about its strength.

Recycling concrete is a smart and environmentally-conscious choice that saves resources. With in-place recycling, the recycling process has become even more cost-effective, too!

In-place concrete recycling reduces construction costs because a contractor doesn’t have to locate a recycling center or pay for trucking the materials away. This saves money for taxpayers and agencies.

23-02-2012 om 04:02 geschreven door annazhao356  

The limestone roll crusher is suitable for crushing sulphur iron ore, phosphate ore, barite, celestite, coke, limestone and so on. The limestone crusher can be divided into roller crusher and four roller type crusher according to the number of roller. The operators should to do maintenance work when roll crusher at work, so as to extend the using life of the crusher. In this regard, look what should pay attention when the limestone roll crusher in the work!

The most important issue of limestone crusher equipment selection is to know what this device will have to bear the task. In other words, the limestone crusher equipment selection is the core issue of what it is to process the material? What the material particle size is? How much the capacity and what kind of product will be produced? The material need to be processed is varied. Each material has different characteristics. Some materials are crushed more easily, while others require more crushing energy; some of the materials will be broken into blocks, and some materials will be broken into powder; wear and tear of some limestone crusher machine is strong, while others are caused by the wear rate of limestone crusher equipment is very small.

Pay attention to the bolt-on condition and immediately tighten up if any bolt loosen. Starting the limestone roll crushe first, feed material after the machine operating normally. Regularly check the wearing parts of limestone roll crusher, pay attention to replace wearing part at any time. Check the discharge condition of roll crusher, eliminate material if any blocking happened.

Additionally, the machine should not be overload, pay attention to the electric instrument at any time. The bearing of roll crusher should be refueled timely and avoid oil leaking in the bearing. Control the bearing temperature and not higher than the surrounding air 25 to 30 ℃. The limestone roll crusher is widely used in cement, metallurgy, chemicals, electricity,coal and other industries for processing the brittle and ductile materials.

In order to select limestone crusher equipment for a particular purpose, people should know what kind of material that being crushed. For example, if the material is limestone, you can choose the limestone crushers such as, jaw crusher, impact crusher. But the differences between these materials is significant. Tests of materials in laboratorycan be able to avoid some unnecessary spending a lot of information. For example, as high wear resistance index of the quartzite-like materials should not be fed into the impact crusher, because this equipment not only with high maintenance costs, but also to spend a lot of time. The kind of dolomite materials do not need to use large scale limestone crusher equipments.

23-02-2012 om 04:02 geschreven door annazhao356  

Building materials is the basis of the buildings and structures, road building materials for all parts of the road bed, pavement, bridges, tunnels and other various components and structures.

This series of crusher are widely used in metallurgy, mining, chemical, cement, coal gangue, construction, sand, refractory material, ceramic and other industrial and mining enterprises, engaged in breaking and crushing the material in the operation. Used for tertiary or quaternary crushing, it is mainly suitable for crushing various ores the compressive strength of which is no more than 320MPa.

Industries as hydropower, roads, railways, construction (urban central supply concrete) and other sectors in China are the national infrastructure industriy, and also are the state mainly invested industry, which have a very prosperous prospect. Those industries above require the sand and gravel system to produce aggregate, so as to meet the quality requirements of concrete. Hammer crusher has been widely used in the system.

The hammer crusher application is wide in processing building materials for construction like above. With the large-scale expansion of China's highway construction, road building materials use and development of speed is also faster and faster, traditional building materials widely used in foundation engineering, but has been increasingly unable to meet the rapid development of highway construction on standard engineering requirements. So the demand for hammer crusher application has been increased greatly. High quality building material need good performance hammer crusher. Hongxing hammer crusher has been applied to construction, chemical industry, light industry and so on.

After building materials and solid materials are crushed, the internal crystal structure changes, the surface and the unit mass can increase, can improve the speed of physical and chemical reaction, easy mixing and improve homogenization, and create favorable conditions for drying, storage and delivery. This is the reason why hammer crusher application is popular in construction industry. Hongxing hammer crusher application is wide also because of high quality crusher hammer and rotor. The hammer crusher application can meet different crushing request of construction material.

The structure features of the hammer crusher in the aggregate system:

1) Large feeding mouth, high crushing chamber, suitable for the materials with high hardness and block degree, low dust pollution;

2) Convenient to adjust the gap between hammer board and board hammer, effective to control particle size;

3) Compact structure, high rigidity, the rotor with great inertia;

4) High chromium plate hammer with large hammer resistance, abrasion resistance and hammer force;

5) Non-key connection, easy maintenance, economical and reliable;

6) Perfect crushing-function, high productivity, high overall efficiency.

23-02-2012 om 04:02 geschreven door annazhao356  

The roll crusher equipment is a very potential force in market development of the crushing plant, roll crusher plays an important role in the process of crushing materials, the material is repeatedly crushed by the broken parts. Compared with hammer crusher and impact crusher, in the crushing of materials, the roll crusher equipment is more suitable for crushing brittle materials.

Roll crushers have a theoretical maximum reduction ratio of 4:1. If a 2 inch particle is fed to the roll crusher the absolute smallest size one could expect from the crusher is 1/2 inch. Roll crushers will only crush material down to a minimum particle size of about 10 Mesh (2 mm). A roll crusher crushes using compression, with two rolls rotating about a shaft, towards the gap between the rolls. The gap between the rolls is set to the size of product desired, with the realization that the largest feed particle can only be 4 times the gap dimension.

Roll crusher equipment has large crushing ratio and can up to 50. This roll crusher can be used to crushing limestone in cement industry. Any company and business that use of the roll crusher equipment or are using the production of roll crusher has a deeper understanding of the improvement the utilization of crushing materials. Spare parts of roll crusher equipment is easy to replace, and has a corresponding reduction in maintenance expense. This machine is suitable for a very large hardness of materials or used for soft materials.

Some major advantages of roll crushers are they give a very fine product size distribution and they produce very little dust or fines. Rolls crushers are effectively used in minerals crushing where the ores are not too abrasive and they are also used in smaller scale production mining of more abrasive metal ores, such as gold. Coal is probably the largest user of roll crushers, currently, though. Coal plants will use roll crushers, either single roll or double roll, as primary crushers, reducing the ROM coal. Usually, these crushers will have teeth or raised forms on the face of the roll. (Roll crushers used for minerals and metal ores have smooth faced rolls.)

Roll crusher equipment in daily use, the maintenance of the machine must be aware of. In particular, the operators need to pay attention to maintenance of the roller of roll crusher equipment, because the most easy to wear and consumption is the roller.

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Sand maker (Sand making machine) is the equipment which makes sand artificially. It can be impact crusher or cone crusher according to the materiel condition and production requirement.HX series impact crusher is a high-efficiency rock crushing equipment with domestic and international leading level. In order to make their client to use sand making machine more exactly, do safe operation of electrical equipment,increase of service life, they summarize six basic safety engineering:

1. Before operation, inspect whether the observation door of vortex chamber is shut tight to avoid danger.

2. Examine the rotation direction of impeller; impeller should performance anticlockwise rotation.

3. The starting sequence of sand making machine and transportation equipment: discharge→ sand making machine→ feeding; crushers must be started without load, and feeding can be carried out when crushers run normally. Shutdown sequence and start-up sequence is opposite.

4. Materials whose size exceeds the limit shouldn’t be fed into crushers, otherwise, it may cause the unbalance of impeller or excessive abrasion of impeller, even leading the block of impeller passage.

5. When the discharge equipment stops, feeding should be timely ceased.

6. Materials should be fed evenly and continuously.

7. Fierce vibration and abnormal noise are not allowed during operation.

8. The addition of grease lubrication should make up 1/2-2/3 of bearing chamber; Add proper lubrication grease each time crushers work an hour.

The construction and mining machinery/equipment market is in the midst of a consolidation phase, as acquisitions and strategic partnerships are still continuing after a spurt in the consolidation wave of the nineties. The highly competitive industry has maintained price levels in the moderate range with slight fluctuations, over the last few years.

Key competitive factors that affect construction & mining equipment manufacturers include service, distribution networks, quality, features and price. In addition, unprecedented growth in the rental industry transformed the landscape for customers, manufacturers and distributors of construction equipment. Further, key end markets for construction equipment such as mining and forestry exert a significant impact on the industry.

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Stone crusher is a kind of machine whose discharge larger than three millimeter takes up more than 50%.

Crushers usually adopts the transmission of direction connection; Optional: magnetic separation device, automatically even vibrating feeder system. Main part: rotor, having experienced dynamic balance test with high precision; Hammers of good quality with special heat treatment.

However, abrasion and corrosion are two main problems we need to address during usage. One crucial approach is to employ exquisite materials. While in real practice, there is some contradiciton like the issue of carbon value. With less of this value, the material hardness will be greater reduced, whereas this value is high, materials are prone to be rusty. So we must try to find the balance within when choosing crushers.

To abtain both of these two characters: anti-abrasion and anti-corrosion, well consideratoin should be taken. Generally, its material hardness is no more than 316L stainless steel with low carbon.

Generally, crusher‘s maintenance approach can fall into the following three categories: minor repair, medium repair and major repair with different maintenance time respectively.

a. Minor Repair: it includes test and restore adjustmemt device, high speed discharge opening, the replacement of liner plate, repair some transmission part, change lubrication system, etc. Its period is about one to three months.

b. Medium Repair: In addition to the first repair approach, it also includes the replacement of toggle plate, test and restoration of bushing, etc. Its usual period is about one to two years.

c. Major Repair: Besides medium repair, it contains replacement of bearings, the casting of babbitt on the head of pitman coupling, replacement of easy-wear parts. Its average period is more or less five years.

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Of course, any businessman cares about the cost. For mining machinery consumers, how to save money is the important thing when purchasing and using.

In the era of thchnology economy, advanced technology has taken the leading position in the business circle. As to buyers, it's beneficial for a long period to purchase the advanced equipment with reasonable price. Henan Hongxing is just the best manufacturer of mining equipment.

Fine crusher always be used in limestone raw material crushing. Such as desulfurization limestone and gypsum fine crushing in power industry. In metallurgical industry, fine crusher mainly used for crushing iron ore, periclase, steel slag and son on. It can also be used for super fine crushing of quartz raw materials in the glass industry. As well as limestone crushing in sand stone industry and phosphate ore crushing in chemical fertilizer industry. The crushing of these materials require a relatively small size of the discharge products(usually under 8mm).

In this case, many customers will adopt the change two-stage crushing into the three stages, this is a very effective means. However, people encountered complex and difficult process layout and large investment problems in a specific technological innovation process. While Hongxing fine crusher can solve these problems. This fine crusher machine has the absolute superiority compared to the similar crusher:

The maximun feeding material size can up to 1300mm, and the minimun discharge material size can under 8mm. Fine crusher can save 35-50% of total investment than two stage and three stage crushing system. Save 30-40% of the cost of operation and management. Wear parts of fine crusher with long working life and the maintenance frequency is greatly reduced.

Hongxing Brand is a 'China Famous Brand' for reliable and stable quality, and been awarded the 'Civilized Enterprise' 'Key Enterprise' 'Enterprise with Standard Quality' and 'Enterprise with Honesty and Credit Standing'. The company has modernized management system, first-class gold-processing equipments, perfect detection methods, high-quality personnel and fine after-service. We firmly believe that we can get sincere repayment with our sincere dedication. And it's not in doubt that ' To choose Hongxing is to choose convenience.'

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What is Rust? Technically, it’s oxidized metal. It generally occurs where water is allowed to stay next to unprotected steel for a period of time.

There is one problem that makes enterprise headache: When there are both water and oxygen on the steel surface it is easy to rust. Rust is a kind of corrosion occurs on the surface of the steel, which every year cost a lot. To prevent your crusher rusting, Henan Hongxing - professional crusher manufacturer introduces the following measures to the majority of users:

1) during the crusher storage or seasonal shutdown period, your should run the machine for at least 5minutes at least once a month in order to ensure correct lubrication bearing.

2) if the flywheel has been removed from the eccentric shaft, the contact surface between the flywheel and the shaft should be coated with preservatives.

3) if the jaw body is removable from the frame, the seal should be coated with enough oil to prevent debris from entering the bearing seat.

4) crusher and the removed parts should be stored in a solid support to prevent directly contact with the ground.

5) when pick out the crusher from the repository, you should check the painting and repair it according to the need.

Before assemble the crusher, you should be removed the preservative from all contact surfaces.

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Bucket elevators can be used to handle a great variety of bulk materials. The basic design involves a belt or chain driven around head and tail pulleys, which carries buckets containing the material. This is carried out within a fully sealed casing, providing efficient dust containment for materials posing dust emission problems.

The advantage of using bucket elevators is that they are simple in construction enabling maintenance and fault finding to be carried out on site with ease.

Hongxing can competitively design and supply a large range of bucket elevator types from heavy duty, high temperature, high tonnage applications to the lighter duty applications.

Chain and Bucket Elevators

In special applications where high temperature, high tensions or corrosive material properties exist, Hongxing can implement chain to elevate buckets rather than belts.

Pulleys

Crowned, Diamond Lagged or Slatted pulleys can be supplied, esuring the most suitable pulley for the application is selected.

Shaft Seal Arrangements

Based on the application, two main types of selas can be provided, either a labyrinth seal or, in arduos circumstances, a tripple seal stuffing box.

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Minister of Land and Resources recently held China International mining Conference, said China is committed to scientific development, continue to adhere to save low resources consumption, little environmental pollution and the new road to industrialization. 'scientific development, promote green mining' is a new path of industrialization in China mineral resources in the field of concrete embodiment. Here, the green mining industry has become the most eye-catching words, the reason for it visible, because it is China's economic development, because it is in line with the direction that mining industry calls for the requirements of energy conservation advocacy and environmental protection development.

The so-called 'green mining' refers to the disturbance in the mine environment is less than the premise of the capacity of the regional environment to achieve optimal exploitation of mineral resources and the environment are minimized. Implementation of green mining industry there are three stages:

First, the regional environment through the development of capacity or former capacity evaluation and mine environmental assessment and disturbance, the establishment of environmental evaluation index system and technical standards, to develop green mining plan;

Second, but through technological innovation, optimize Process, to achieve mining, dressing, smelting and refining process, a small disturbance, no poison and less pollution;

Third, through the mining environmental management and ecological restoration, to achieve minimum environmental disturbance and ecological reconstruction optimization. We say that the development of green mining is the voice of the times, China's economic development, it is not groundless, but evidence-based.

Over the years, our economy has been growing rapidly though, but we also paid a high price, called a lot of fees. Relevant data show that the country due to ground subsidence due to mining to 180 locations with more than 1,600 pit collapse, subsidence area of over 1150 square kilometers. The collapse of the national mining subsidence disaster occurred nearly 40 cities, causing serious damage to the 25 annual ground subsidence due to mining, the loss occurred up to 4 billion. The mining, ore mining 6 billion tons per year the amount of disturbance of the Earth's environment, induced the mountain crack, collapse, landslide, debris flow, earthquake and other geological disasters. These figures are shocking, but in order to change this situation, to promote green mining industry is the best way.

22-02-2012 om 03:47 geschreven door annazhao356  

A strict maintenance schedule and well-trained maintenance crew can save companies a large amount of money over the course of equipments life. The maintenance function in any operation is in charge of keeping the equipment operating at maximum productivity or capacity. Scheduled maintenance reduces downtime and ensures the efficient and safe operation of the system. A quality maintenance program begins with management and their insistence on strict routine maintenance schedule and periodic outages specifically for the overall review of the equipment.

The maintenance of a belt conveyor is basically the same as any equipment with moving parts and no matter how well the conveyor is designed and constructed it will require scheduled maintenance and periodic service maintenance.

Recommended components of a belt conveyor requiring routine maintenance and service:

Electrical: Motors - lubricate internal bearings as recommended by the manufacture. Safety switches check electrical connection and any signs broken parts.

Reducers: Lubricate internal bearings and fill oil level as recommended by the manufacture.

V-Belts: Check for proper tension and worn or cracked areas.

Chain drives: Check for proper tension and worn roller and sidebars.

Screw Take-ups: Check for proper belt tension and remove any built up material.

Idlers: Check for free rotation and excessive worn areas, if greaseable type lubricate as recommended by the manufacture. Remove any built up material.

Training Idlers: Check for proper alignment to belt and free rotation or excessive worn areas, if greaseable type lubricate as recommended by the manufacture. Remove any built up material.

Pulleys: Check pulley alignment and surface of lagging if lagged. Pulley assemblies should rotate freely. Remove any built up material.

Bearings: Check for proper alignment to frame and lubricate as recommended by the manufacture. Remove any built up material.

Belting: Check for proper tension excessive wear areas, torn, or ripped areas. If a mechanical splice check fasteners.

Belt Cleaners: Check for proper tension and wear on the cleaner blade and replace if needed to keep cleaner from rolling under.

All operators should familiarize themselves with the details of the equipment involved and take necessary precautions. If the operator of the equipment is aware of a potential hazard it should be brought to the owners attention for immediate correction.

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Continental Belt conveyor Systems equipment offers many safety features, some of which are standard, while others are optional and specified by the user based on conditions under which the equipment will be operating. Good common sense is the key when working on any equipment and must be used while observing or servicing equipment.

The maintenance of a belt conveyor is basically the same as any equipment with moving parts and no matter how well the conveyor is designed and constructed it will require scheduled maintenance and periodic service maintenance.

The section deals with general maintenance practices and is not intended to be a guide for the actual maintenance of specific parts on the conveyor. This particular information is available from the manufacture's manuals; please consult it for maintenance schedule and lubrication requirements.

A strict maintenance schedule and well-trained maintenance crew can save companies a large amount of money over the course of equipments life. The maintenance function in any operation is in charge of keeping the equipment operating at maximum productivity or capacity. Scheduled maintenance reduces downtime and ensures the efficient and safe operation of the system. A quality maintenance program begins with management and their insistence on strict routine maintenance schedule and periodic outages specifically for the overall review of the equipment.

Manual inspection, maintenance or repairs must be done at a time the can be taken out of service, properly lockout and tagged. In NO case should belt conveyors or any operating equipment be serviced while in operation. Only visual inspection can be done during operation and care must be taken to be at a safe distance and not be wearing loose clothing. Inching drives provide an excellent method of visually inspecting the belting.

Companies must constantly observe the working conditions, and if doubt exists, as to whether you deem your equipment safe enough for your employees welfare, call in a qualified safety engineer to advise you as to whether or not your equipment satisfies current safety regulations and requirements of any federal, state, municipal or other duly constituted regulatory agency to whom you might be responsible.

Equally as important to the maintenance schedule of belt conveyors, is that service being performed by well-trained, competent personnel provided with proper test equipment and tools. The maintenance crew should be skilled employees empowered to shut down the conveyor to make repairs necessary repairs.

Employees, maintenance personnel and operators must be made aware of the type of equipment and how it operates and of the power required to operate this equipment. Basic conveyor safety begins with the design of the equipment that avoids foreseeable hazards. Company management must provide training in the proper operation and maintaining of the equipment. Management must insist on good housekeeping and safety procedures.

The information contained in this manual is be used as a guideline only, any company policies, local or state regulation should be adhered to. The recommendation on service and maintenance are general in nature and any technical information from the manufacture on particular parts should be used.

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Screening is a process of separating into groups of different products of various sizes. Each group consists of products of approximately same size. The mass, which remains, on a screen is called the oversize of the screen and the material, which passes through the screen is, called the undersize.

The vibratory screen should be compulsorily enclosed from the screen supporting platform level up to top of the screen. The enclosure should be provided either with maintenance walkway around or without walkways with a compact enclosure of the size of the screen only.

The screens in between the primary and the secondary crusher help in separating the oversize. The oversize goes to the secondary crusher while the undersize is discharged through a chute on to the same conveyor belt, which receives the discharge from the secondary crusher. This saves considerable power in the second crushing stage and also increases the capacity of the secondary crusher, as it eliminates possible choking of material in the crusher, particularly during wet weather or wet material.

Screening is generally classified into two types.

(i) Coarse screening, which is achieved through Grizzlies, Vibratory Screens, Revolving Screens or Shaking Screens.

(ii) fine screening which is achieved through Vibrating screens, Shaking Screens. Brief description of various screening technologies is given below.

Vibrating Screens save space and weight, and operate on little power because the screening surface may be actuated by vibrating, gyrating or pulsating movement of small amplitude, but at frequencies that normally exceed 3000 cycles per minute.

Combination of frequency of vibration (speed) and amplitude (throw), affects performance of any vibrating screen. A correct combination of slope and direction of mechanism of rotation is vital for inclined screens. The larger the opening the greater the amplitude needed for a screen. Vibrating screens are mainly divided into two classes. Mechanically vibrated and electrically vibrated.

The mechanical shaking screen comprises of a rectangular frame with perforated steel or wire cloth. It is usually inclined and suspended on loose rods or cables. They are used mainly for special tasks of coarse screening. The screening media that are normally in use are of many classes. Following are some of the commonly used media in the stone crushing industry.

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Bulldozers, loaders, excavators and truck crane, etc. in use for some time, often there will be deterioration of the sensitivity control mechanism, slow work of agencies and so on.

Engine exhaust, running, sounds all unusual, difficult to start, accelerate slowly; oil contaminated hydraulic system, hydraulic components and piping, external and internal joints are a serious drain, the hydraulic cylinder does not lock automatically retract; whole Machine loose drive chain of the manipulation of the handle, maneuver block effort. The reason resulting the detections includes overload of work is mainly a long time and do not meet the requirements in the operating environment; routine maintenance is not timely, large, medium and minor repairs not up to standard requirements.

Adjustment and repair methods

(1) the adjustment of the engine throttle

For example, crane equipped with diesel engines in the car, after a long-term use, sometimes in the manipulation of the throttle the car will appear when the slow growth rate, reach maximum speed and maximum power of the situation. At this point need to check and adjust the throttle pedal on the car the entire driveline. This would take two people, one person in the car control the accelerator pedal and the other was observed in the fuel pump speed control lever at the movement. The crane used for many years, the operator in the cab of the accelerator pedal Although extreme position, but in fact the speed diesel engine fuel pump rod and sometimes can not reach the limit position. Speed control lever in the Machine because of the position in the operator's position is not easily observed, the air travel is often overlooked, should be to observe for a while, try several times. Reasons for this situation, one size chain drive engine throttle changes, among which is too large due to the accumulation of air travel; Second, some fasteners on the gear, such as caused by loosening set screws. At this point the throttle should be gradual to check the drive size chain, when the throttle on the train ride in the end, the speed control lever must reach the limit. Throttle drive chain shall be required on the process sacrificing the space should be based on the specific situation of each device fastening and adjustment.

(2) gear pump repair

Gear pump wear, pump shell is mainly the surface of tooth wear on top and tooth thickness. Repair methods are: wear in the pump shell surface layer of metal coating solution at the brush, so to restore the original size; the top of the gear tooth and the tooth may be its thickest plating, restoring the top of the tooth thickness and tooth size; axis sets are generally not only for repair and replacement bushings must pay attention to its axial length, do not leave space. Several of the same model can be used on the gear pump for accurate measurements, and then use lighter gear and wear re-combined with the pump installed and a test in the test rig.

(3) piston pump repair

Wear surface of the plunger piston and the rotor is mainly compatible with the plunger hole. Repair Methods: According to the wear measured by the size of the plunger hole reconstituted plunger, the plunger of the new materials, heat treatment technology and outer dimensions and surface roughness must comply with the relevant technical requirements; Assembly may, before the new plunger with the hole and grind it. In addition, it can be used in the selection of some of the same model worn piston plunger and rotor to a lesser extent plunger hole re-combination equipped. Generally speaking, the old with the gap between the plunger and the hole should not exceed 35mm, 45mm when the wear reached should be rejected.

(4) control valve repair

Should be measured in accordance with the valve stem hole the size of the wear re-formulated the new stem, new stem material, heat treatment, size and surface roughness departments must ensure compliance with relevant technical requirements; the new valve assembly before the best rod and the valve stem hole on the ground look, (preferably a car manufacturing process used to grind the spindle), can also be used if the conditions are not met milling about the same time a new stem, but also on the control valve positioning and pressure adjustment spring Unit elasticity of the return spring testing to see if it meets requirements. Can also be based on the valve stem of each hole to determine the degree of wear and tear repair methods, if the same model more than the old valve can be detected between several and deployment. After repair the valve should be tested in the pilot stage, the valve can also be flat, two holes in the above to fill kerosene, with a stopwatch to measure the speed of the oil spill to determine the extent of the valve seal.

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When other multinational giants still looking for a new road to recovery, construction Machinery enterprises in China has become the absolute protagonist of the show. According to Voice of 'news and newspaper summary' report, known as the Asian construction machinery industry benchmark known as the 2010 Shanghai BMW Exhibition April (23) opening. Xuzhou Construction Machinery Group Chairman Wang Min said that by 2015, construction Machinery enterprises in China will be among the world's top five.

As traditional manufacturing and emerging industries, modern energy industry, modern agriculture, integrated transport system are all key industry future, and therefore as the representative of the mechanical engineering machinery industry will undoubtedly play an important role. At present, the mining machinery market is facing several development emphases, first is product innovation, and second is the large-scale product.

Nowadays the mining machinery market faces several development point, first is the innovation crushing product. After the development in 2011, more and more manufacturers were streaming out of mining machinery industry. A few small-scale enterprises blindly chase and imitate others equipment production, their product quality is no guarantee and they do not have core competitive power of enterprise products, in the long run, the enterprise will naturally be submerged in the wave of the high development of the economy and eventually was out of the game. Therefore, if a crusher enterprise wants to develop in a long period of time, it is necessary to have market core competitiveness and has its own unique products.

Wang Min, chairman of Xuzhou Construction Machinery Group, said: 'By 2015, when Xugong (000425) must become the world's top five construction equipment, direct approximation of the world, Caterpillar, Komatsu. Now the world's largest Caterpillar this year he is now more than 300 billion U.S. dollars, in order to reach such a scale beyond. ' However, Wang Min stressed that Chinese companies want to break the European and American giants dominated the International Heavy machinery market for many years, but also to seek a breakthrough on the core components.

The development of mining machinery is closely related to the improvement o human’s technology, modern technology of science and the whole level of the industry, especially the development of mechanical engineering and mining geology. The general trend of mechanical engineering’s development is digitalization, intellectualization, precision, micromation, vitality and ecologization. As a branch of mechanical engineering, mining machinery abides by the trend, too. Meanwhile, regarding the features of mining machinery, its trend will be digitalization, intellectualization, precision, micromation, vitality and ecologization.

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The fundamental goal for the design of a crushing plant is an installation that meets the required production requirements, operates at competitive cost, complies with today's tough environmental regulations, and can be built at a reasonable price despite the rising costs of equipment, energy and construction labor. These can include the owner's engineering staff, safety personnel, operations and maintenance personnel, equipment manufacturers, and the engineering consultant. Ideally, the consultant combines his knowledge and experience with an understanding of all parties' needs, to provide a balanced, workable, safe and economic plant design.

Capital Cost

Direct Costs. The largest primary gyratory crushers cost US $2 million or more, while overall crushing plant costs can be as high as $18 million. It's necessary therefore to estimate crusher installation costs based on equipment costs plus the following direct costs, including construction contractor indirects: Earthworks, Mechanical, Concrete, Electrical, Structural steel, Instrumentation, Architectural Indirect Costs. Indirect costs can fall within a range of 40 to 60% of the direct costs, and include: Construction indirects, Startup and commissioning, Construction equipment, Freight, Spare parts/first fill, Taxes/duties, Engineering, procurement and construction management (EPCM), Owner's costs (relocation, hiring and training personnel, permits, licensing fees, etc).

In addition to the above, a contingency to cover unforeseen costs will be in the range of 10 to 20% of the sum of the direct and indirect costs. The designer must be aware of the project-specific costs of all such elements, so that he can monitor costs and promote methods of reducing total installation costs. In some locations, for example, labor and material costs could make a gabion wall more expensive than a poured concrete wall, which has minimal structural backfill.

Ore Characteristics

Ore characteristics are a critical element in both crusher selection and plant design. Dry ores require greater provisions for dust suppression and collection, including dust enclosures around screens, sealing on conveyor skirts, and vacuum and wash-down systems. Wet, sticky ores can plug chutes, reduce surge capacity, and decrease the live storage capacity of bins and silos. To address this problem, chutes must be easily accessible for clean-up, and large feeder openings must be provided for bins, silos and tunnels. If it is practical to obtain representative ore samples, it is prudent to have testwork conducted to establish ore flow properties, which will influence design parameters.

At virtually all mines, ore characteristics change over time, and it can be costly to 'design in' the optimal flexibility required to handle such changes. Some owners stipulate that initial capital investment be kept to a minimum, with design modifications paid for out of the operating budget. This is not always easy to achieve.

Safety and Environment

Safety must be designed into all mining facilities. North American mines must comply with local and national regulations such as OSHA, MSHA, the Mines Act and the WCB. The modern plant includes safety guards around all moving equipment, and emergency pull-cords on both sides of any conveyors with personnel access. The maintenance department and safety officer must keep these safeguards in working order. Ongoing safety training of plant personnel is imperative, and is considered to be one of the most vital and monitored feature of most mining operations.

Dust emissions must comply with the latest regulations for the jurisdiction. Designers must make provisions for the installation of dust abatement, suppression or collection equipment. Spillages from feeders, chutes and conveyors must be minimized. Spill collection can be 'designed in' on feeder installations; chute designs can minimize spillage at receiving and discharge points; and conveyor belts can be widened to be more forgiving (e.g., skirting internal back-to-back width can be reduced to allow the belt more side travel.) Skirting should be extended a minimum of three belt widths past the load point. Rules for conveyor and load point design should be used for guidance only, with transfers custom-designed to suit a particular project. It goes without saying that clean plants have lower operating costs. Crushers, screens and dust-collection fans all contribute to high noise levels. Air-cooled lubrication systems are not only noisy, but often leak oil. Well-balanced, choke-fed crushers, dustenclosed screens and dust collector fans with silencers can keep noise levels under control. Recirculating water can be used to cool crusher lubrication systems.

22-02-2012 om 03:46 geschreven door annazhao356  

As we know that fertilizers have enabled better growth and yield of plants and vegetation, have you ever considered about their harmful effects on the environment? And fertilizers as the chemicals afffect our lives and the planet.

Mother nature has always taught us to balance out everything, and still continues to do so! If you eat a lot, your body naturally bloats up and tells you to exercise and come back to shape. When you exercise too much, your body tells you to slow down and relax. If there is rain, you also get the Sun, each and everything works fine till a balance is maintained. And we all know the consequences of imbalance. A classic example for the same would be the rise in global warming due to various reasons, including deforestation! Same is the case with fertilizers. The problem is that humans tend to use too much of fertilizers in the soil because they have to cater to the global demand of food. As mentioned already, more than half of the total yield production is out of synthetic or inorganic fertilizers which contains components like nitrogen, potassium, sulfur, calcium, magnesium, and so on. These chemicals and minerals, although help in boosting the growth of plants, they also have their drastic side effects in the long run. Mentioned below are some key points defining the effects of using fertilizers on the environment.

When you use too much of fertilizers in the soil, it leads to eutrophication. Fertilizers contain substances like nitrates and phosphates that are flooded into lakes and oceans through rains and sewage. These substances prove to become toxic for the aquatic life, thereby, increasing the excessive growth of algae in the water bodies and decreasing the levels of oxygen. This leads to a toxic environment and leads to death of fish and other aquatic fauna and flora. Indirectly, it contributes to an imbalance in the food chain as the different kinds of fishes in the water bodies tend to be the main food source of various birds and animals in the environment. You would be surprised to know that more than 50% of the lakes in the United States are eutrophic!

The nitrogen and other chemicals present in the fertilizers can also affect the ground waters and waters that are used for the purpose of drinking! One of the most common result for this can be the development of blue baby syndrome which occurs in infants whose skin tissues are low in oxygen, which is why their skin appears to be blue or purplish in color. You would also be interested to know that studies reveal that the use of lawn fertilizers and pesticides can cause health risks like cancer and chronic diseases in humans, especially in children.

Though this may sound ironic to you, the fact is that using too much of fertilizers in the soil can alter the fertility of the soil by increasing the acid levels in the soil. Which is why it is recommended to get a soil test done at least once in every 3 years so that you can keep a track whether or not you are using the right amount of fertilizers. The levels of soil pH varies from 0-14, wherein 0 is considered to be the most acidic and 14 being the most basic. 7 is considered to be neutral. The ideal soil pH varies from plant to plant and can be altered by bringing in some changes. Bottom line for using too much of fertilizers in the soil is that though it may seem to work currently, there are high chances that you may not use it for plant yielding in the long run.

Fertilizers consists of substances and chemicals like methane, carbon dioxide, ammonia, and nitrogen, the emission of which has contributed to a great extent in the quantity of greenhouse gases present in the environment. This in turn is leading to global warming and weather changes. In fact, nitrous oxide, which is a byproduct of nitrogen, is the third most significant greenhouse gas, after carbon dioxide and methane. Therefore, you can well imagine as to how harmful is the use of fertilizers for our environment... and the ongoing use of fertilizers across the world will only make matters worse!

These facts are alarming and a serious step needs to be taken as soon as possible to avoid more severe consequences. The use of fertilizers for growth and cultivation is keeping our stomach filled for now, but then if things keep on progressing the way they are, it won't take long to see the times where there is lack of food, water, and health.

21-02-2012 om 03:30 geschreven door annazhao356  

Modern underground mines have rigorous safety rules and precautions and mining companies require a great deal of on-the-job safety training. In addition, the Federal Coal Mine Health and Safety Act of 1969 directed the National Institute for Occupational Safety and Health to study the causes of coal-related diseases and to develop a program to prevent the heath problems of coal workers. Mining requires workers to spend long hours underground in hazardous and often unstable conditions. Miners use a variety of safety equipment to stay safe on the job daily. These pieces of equipment can save the lives of those who choose to enter this particularly dangerous line of work.

Cap Lamps

Mines are completely dark unless workers are near the entrance or provide the light themselves.

Miners often have their own personal lights attached to their hard hats, even if the work site has lights set up. The workers may need to make their way through dark areas to transition from one spot to another, or the light system's power could fail. A miner's hard hat can be fitted with a small battery pack and a lamp that hooks to the front.

Respirators

Inhalation hazards are among the most significant dangers for workers in mines. Gases can cause nausea or may even be toxic. Dust particles in the air can cause respiratory complications and more.

Minors often use respirators to reduce inhalation levels and work comfortably in the mine. The style of respirator varies based on the dangers associated with a particular mine. Many respirators are simple face masks with an odor filter and protection from airborne contaminants. Some are powered and provide a flow of fresh oxygen to the miner.

Gas Detection

The days of taking a canary into the coal mine as a warning system of poisonous gases are long gone. Gas detection sensors are now placed in mines to monitor the levels of methane, carbon monoxide, oxygen, nitrogen dioxide and other gasses to ensure that the workers are not in danger of inhaling a toxic gas or running out of oxygen.

Portable Air

Mining involves digging, scraping and pounding hard materials such as limestone and other rocks. To make the job more efficient and safe the industry now uses pneumatic tools instead of hammers and picks. While these older tools are still used, the heavy lifting is done by air-powered equipment.

Portable air systems are much lighter and more mobile than older air compressors and canisters. They can be rolled along or worn by a worker. The hose attaches to the pneumatic tool of choice.

Employees who have worked for in mines for extended periods of time have a greater chance of developing a mining- related illness. These illnesses are caused by exposure to mining chemicals and the physical hazards which are associated with mining. Mining related illnesses include respiratory disease, lung cancer, hearing loss and musculoskeletal disorders.

21-02-2012 om 03:30 geschreven door annazhao356  

Mobile equipment is used in many industrial applications, be it mining, construction or freight. However, the field with the highest potential for hazard is the mining field. Such as in mining mahcinery industry, there are mobile crushing station, mobile jaw crusher, mobile impact crusher and so on. Mobile equipment is heavy-duty industrial equipment that is used to move material from one area to another. Some examples would be forklifts, dump trucks, tractors and backhoes. This type of equipment can be hazardous if used incorrectly, so proper safety precautions should be taken to avoid injury. Luckily, operating mobile equipment safely is possible for most people when following a few steps.

1. Obtain a commercial driver's license (CDL) before operating mobile equipment. This will ensure that you or anyone operating the equipment will be properly and legally trained. A CDL can be obtained through a local technical college or private institution. The cost varies depending on the type of equipment you will operate, but generally the CDL will cost around $75. You have to be 21 years of age in most cases to get a CDL and complete a series of written tests.

2. Inspect the equipment before beginning use. Look for fuel leaks or any visible defects like damaged electrical or mechanical parts. If repairs are necessary, do not operate before those repairs are completed. Local mobile equipment service technicians will be able to repair most types of equipment.

3. Fasten seat belts when using mobile equipment to avoid injuries.

4. Maintain focus while operating the equipment and keep a look out for other people or vehicles in the vicinity. Use extra caution when moving in reverse. There is a warning sound on most mobile equipment like dump trucks and forklifts when moving in reverse.

5. Keep loads under the intended load capacity. Never attempt to lift more than your equipment can handle. The load capacity can be found in the manufacturer's handbook.

6. Avoid transporting people on mobile equipment and only use it as intended.

Mobile devices that impair your ability to drive safely include cameras, cell phones, laptops, music players, pagers and personal digital assistants (PDAs).

21-02-2012 om 03:30 geschreven door annazhao356  

Limestone is a sedimentary rock composed mainly of calcite. Are distributed throughout the country, while the more exposed the fine texture of the surface, mining is easy and low development cost, and easier processing and comprehensive utilization.

The largest applications of limestone cement manufacturing industry. Cement manufacturing industry has a considerable advantage, since the invention of cement, cement products as the main construction material has been 180 years. Even in highly developed science and technology today, nor come up with alternatives, so invest in mill production line, for processing limestone for cement manufacturing is a good way to obtain economic benefits.

Limestone can be used in the manufacture of glass, soda ash, caustic soda, etc., iron with limestone for flux, remove gangue, slag forming material to do with lime to remove sulfur, phosphorus and other harmful impurities. In life, made of limestone burning process than pure calcium carbonate powder, used as rubber, plastic, paper, toothpaste, cosmetics, etc. as filler. Agriculture, lime sulfur mixture prepared with lime, Bordeaux mixture and other pesticides. Application of hydrated lime to the soil and soil acidity and improve soil structure, supply of plant-available calcium. Brush with lime tree trunks to protect trees. Chemical industry to use the chemical processing of limestone made of calcium chloride, calcium nitrate, calcium sulfite and calcium important, limestone-rich Xinjiang Province in China, given the huge economic value of limestone mining in recent years to develop limestone flour processing industry and achieved good economic benefits.

Crushed limestone processed by the mill can be used in many fields and achieved substantial economic benefits, limestone flour processing industries in recent years gradually vigorous.

Limestone processing mill is the main equipment, applications can adjust the fineness of the new material mill can produce a variety of uses for limestone powder. Meet the processing requirements of various industries. Hongxing Mill machines produced series including Raymond mill, mill machine high strength, high pressure micro-grinding, fine crusher, the product fully meet the various requirements of the limestone processing, the particle size range from tens of adjustment Head to Head 3000, high yield and stable performance. China currently has a number of limestone powder production line investors successfully installed a complete set of mill production line, provides customers cost-effective protection, is the optimal milling equipment purchase business choice. Another main product-mobile crusher station, PE / PEX Jaw Crusher, PF impact crusher, VSI New Type Sand Making Machine, high energy ball mill, MBS rod mill, etc., have to go abroad, and international standards, depth of domestic and foreign relations have made outstanding contributions.

21-02-2012 om 03:30 geschreven door annazhao356  

As we all know, jaw crusher discharge mouth (row ore mouth) can be adjusted according to user's need to obtain a qualified product material size. Zhengzhou general crusher experts now as this issue, with everyone do simple description, hope to be able to bring you help.

Along with the continuous abrasion gear plate, ranking ore mouth bigger product constantly coarsens, in order to obtain qualified product size, need regular adjustment row ore mouth size. Row the adjusting methods of the ore mouth basically has the following two:

1, gasket adjustment, namely the bearing seat behind thrust board with frame behind after a group of gasket placed between wall, increase or decrease gaskets quantity or changing its thickness, can achieve the purpose of adjusting row ore mouth. This compact structure, regulating and reliable, large and medium-sized jaw crusher multi-purpose the regulation method.

First we must be clear,Concrete Crushers, the jaw crusher thrust board, also called cubits board,Crusher Equipment, in addition to transfer power to and fro dynamic jaw plate do outside, but also has a safety insurance effect, changing its length also can rise to adjust the role of ore mouth platoon.

When jaw crusher crushing cavity things (such as crushing in an iron ball, iron, etc.), for the protection of the equipment is mainly parts are not damaged and use as crusher insurance after thrust board components. With cast iron plate after general thrust moulds overall, in which a trough of some holes open or to lower the cross-section intensity; Also can cast two, then use screws (or rivets) of connecting thrust board, combined. When not broken objects into crushing cavity, equipment overloaded and huge breakage force to thrust plate lead to thrust board broken or combination thrust board screw, machine cut to stop work, have insurance effect.

2, wedge block regulation, it is to use on thrust board with frame between the backseat two wedge block adjustment is suitable for small crusher adopted.

These knowledge may in equipment instructions say not so detailed, so the user is in the purchase equipment, installation debugging when must learn more with crusher experts, mastering jaw crusher insurance and discharging adjustment, stable production can be better.

21-02-2012 om 03:30 geschreven door annazhao356  

Mining Machinery is to develop a technology to improve human, modern science and technology and is closely related to the overall industry level, particularly in mining and mechanical engineering disciplines of science and development are closely linked. Mechanical Engineering, the general trend of scientific development will be digital, intelligent, precision, miniaturization, life, and Ecology. Mining Machinery as a branch of mechanical engineering disciplines, but also follow this general trend. At the same time, combining the characteristics of mining industry and its development trend is digital, intelligent, ecological and amenity of. Mining Machinery manufacturing should continue to integrate into the human's outstanding achievements in various fields, major demand for national economic construction, scientific outlook on development as guidance, to achieve sustainable development.

A) The need for economic development

Along with social improvement and economic development, human resources and increasing demand for energy, but what a resource of relatively poor countries. Followed by resource development, mining depth increased, extending from land to sea, the premise of resource extraction deteriorating security situation is becoming increasingly difficult mining; coal mining in China has reached the depth of 1000m, metal ore concentration 1380m, deposit mining depth increased, water, gas, high stress, geological structure that greatly increased the difficulty of resource extraction.

Automated unmanned underground or dangerous working face is the development direction of the mining environment, but also protect the safety of mining face an effective way. Integrated use of mining science, automation technology, communication technology, computer science and technology, no one working face to automate the basis of theoretical research and development of new technologies, new equipment, so that mining machinery (crusher, ball mill) will be towards robots and intelligent direction.

Storage of a variety of strategic metals seabed mineral resources, to achieve efficient and safe marine mineral resources exploitation, to protect the country's maritime rights and interests and provide technical support for national economic development, social protection for sustainable development. Achieve seabed mining, submarine control need to develop unmanned submersible depth, no diving, etc. made no intelligent cable mining machinery and equipment.

B) Competition in the market-driven

China mining machinery to improve the overall level of senior level comparable with the international discrepancy. Towards mining machinery journey in the manufacture of power, opportunities and challenges. Product design is the soul of the manufacturing industry, product structure, function, quality, capital, delivery time and manufacturability, maintainability, scrap processing and post-human, machine and environment relationship, in principle, are in the product design stage decision. The product is different and the design capacity has become a deciding competitive position in the global primary factor.

Mining Machinery is a high technological content and integration of equipment, development of new equipment constantly results in all areas of human integration in, followed by materials science, manufacturing technology, information technology, computer technology improved, each round There are new technologies into products, parts and components of the update cycle is shorter and shorter, faster and faster updating of new equipment, especially large-scale mining machinery development, no warning from the experience of mature, but not agreed to the design Any errors in the thrown, it must be multi-disciplinary technology with the integration of design efficiency and design quality improvement, promotion, business is different and independent capacity and market competitiveness. Mining Machinery and computer technology, network technology formed the basis of comprehensive digital trends.

C) For the natural environment and harmonious development

China's 'Eleventh Five-Year Plan' that, to build a resource-saving and environment-friendly society, focusing on the development cycle of the economy, insisted on developing equal emphasis on conservation, conservation priority, in accordance with the reduction, reuse, recycle principle, resource extraction, produce consumption, waste generation, consumption and other sectors, and gradually establish the whole cycle of use of system resources of society; to save energy, save water, saving land, saving material, comprehensive utilization of resources to strengthen the promotion of conservation policies.

Machinery from the simple pursuit of scale and efficiency of the model to build the cycle of economic direction 4R. Natural environment for the harmonious development requires mining machinery 'ecology', through a variety of senior technology to improve manufacturing model, manufacturing resources, manufacturing, process manufacturing organizations continued to stand out, so that products are not in the whole life cycle cause environmental pollution or environmental pollution minimization, resource utilization, the highest, lowest energy consumption, the ultimate enterprise coordination of economic and social benefits. Efficient, zero emission fuel cell mining machinery has good development prospects.

Geothermal energy as a green, renewable resources, are identified as countries around the world to maintain social sustainable development of new energy, rich in geothermal resources have been a better use of the developed countries, developing energy resources and the crust of solid waste treatment resources for the Mining Machinery to expand the service area. Mining Machinery in computer technology, network technology, multidisciplinary integrated support for economic development, driven by demand in the market, in the harmony of human and natural community development, mining machinery has been toward the digital, intelligent, ecological and pleasant direction.

Forefront of modern science and technology have significant time-domain, field and dynamic characteristics. Integration between different scientific cross will produce new scientific focus, economic development and social improvement of the mining machinery to generate a new expectations.

21-02-2012 om 03:29 geschreven door annazhao356  

Mobile crusher can be classified into: mobile jaw crushing plant, mobile cone crushing plant, and mobile impact crushing plant, etc. In the manufacturing and processing period, only production operation with sufficient knowledge and recognition about the equipment can have a better output. many customers will possibly have a misunderstanding area in case of unnecessary damaging, which causes a lower efficient of production.

Firstly, only after the mobile crushing plant is working in a stable state, material can be put into for production.

Secondly, the material for crushing must be put uniformly into the crushing cavity instead of putting in side direction or piling full, which can avoid the situation that mobile crushing plant will hold the stress on one side or be overload.

Thirdly, before the mobile crushing plant ends work, stop adding the material into the cavity, after the material in the cavity has been removed totally, the power can be shut down. This avoids the phenomenon of blocking in crushing cavity.

Fourthly, when the mobile crushing plant is working, there are too much materials in the crushing cavity that caused the stop of machine, the electrical power should be closed down immediately, then clearing the material, after it is well cleared, the mobile crushing plant can begin again to work.

Lastly, after a while of using, the maintenance and repair should be on time and checking every parts stability.

21-02-2012 om 03:29 geschreven door annazhao356  

Machinery industry is closely related with the fixed asset investment growth, we expect the “Eleventh Five-Year” period of China’s economic growth will be slightly lower than the “fifth” period of growth, fixed asset investment growth will also be more “fifth” during slowed, but is expected to increase. China's State Council executive meeting on the 4th approved in principle the equipment manufacturing industry restructuring and revitalization plan, this plan made it clear that speed up the revitalization of equipment manufacturing industry, we must rely on national key construction projects, large-scale independent of the major technologies and equipment to carry out the work.

Experts pointed out that the equipment independently of the biggest highlights of this plan. To promote the equipment independently, relying on the planning requirements for efficient and clean power generation, ultra-high voltage power transmission, coal and metal ore mining, pipeline and liquefied natural gas storage and transportation, high-speed rail, urban rail transit and other areas of key projects, targeted to achieve the key products of domestic manufacture; combination of iron and steel, automobiles, textiles and other major industries, key projects, promoting the equipment independently.

China Machinery Industry Federation, said Deputy Secretary-General Song Xiaogang, equipment manufacturing industries for the national economy, technology and equipment of the strategic industries, and equipment independently of not only the development of equipment manufacturing industry itself, but also to the country s economic security.

China National Machinery and equipment development into the best period of development transfer of world manufacturing, China is gradually becoming the world’s factory. United States, Germany, Korea and other countries have already entered the era of industrialization and the development of microelectronics era of high-tech intensive, steel, machinery, chemical and other heavy industries are gradually made transfer in developing countries. China’s current economic development has been the early stages of development, the development of heavy industry is in the middle.

To improve the basis for China s equipment manufacturing spare parts and basic level of technology, planning that, to enhance Forging, basic components, processing aids, special raw materials and other ancillary products, skills, reinforce the basis for industrial development.

In this regard, China First Heavy Industries Group Corporation Wu Shengfu said, good basic parts of the industry is of great significance. Although China can produce a number of large equipment, but has been unable to keep up a good solution to the problem of key components, some of the important bearings, hydraulic components, pressure vessels and other long-term dependence on imports.

The future development will continue to benefit from the revitalization of the equipment of the national police equipment, policies to promote the revitalization of domestic demand. June 28, 2006 “to accelerate the revitalization of the State Council on Several Opinions of the equipment manufacturing industry” (hereinafter referred to as “Opinions”) issued the “Opinions” that future development will focus on 16 major areas, namely:

Power generation, power transmission, petrochemical, coal chemical industry, sheet metal rolling, fully mechanized coal mining, shipbuilding, railway and mass transit, environmental protection, construction machinery, control and precision instruments, machine tools, textile machinery, agricultural machinery, IT equipment and aircraft. “Opinions” not only for equipment.

The future development of equipment manufacturing industry clear direction and goals, but also support the policy put forward a series of measures, including tax incentives, financial support is conducive to long-term health of the machinery industry, rapid development. Expected in the “Opinion” and its related policies and other policies to promote the revitalization, China’s machinery industry will maintain robust growth in domestic demand.

21-02-2012 om 03:29 geschreven door annazhao356  

Since the grinding track is horizontal and the centre of gravity of the roller system only moves vertically, all impact forces and dynamic reactions are mainly vertical and thus easy to accommodate. The extremely low mass of the roller suspension system means low total inertia and thereby low dynamic forces.

In the event of excessive vibrations of the roller system, the lower inertia also limits the dynamic loads on the grinding table and thrust bearing in the gear box as well as on the surroundings.

The variation in hydraulic force is greatly limited by means of the nitrogen-filled accumulators connected to the cylinders, which act as springs. Even though the variation in the grinding bed takes place during operation, the hydraulic force varies within only a few bars.

The horizontal force into the mill housing normally accounts for 10-15% of the hydraulic force. The required raw meal quality and capacity are obtained by easily adjusting the grinding pressure, separator speed, gas flow and dam ring height.

The roller suspension system permits the hot gas inlet section to be designed virtually, without restrictions to the gas flow below the grinding table. The nozzle ring area is adjusted by inserting or removing shims on top of the vanes. Thereby the gas speed can be reduced to a minimum allowed by the amount of external circulation. The benefit of the low gas speed in the nozzle ring is a significant reduction in pressure loss across the nozzle ring and thus a significant saving in power for the mill fan.

The beneficial design of the hot gas inlet with low pressure loss enables the mill to be fitted with an oversize nozzle ring. It is not necessary to involve a larger mill size just to accommodate the gas flow – only the nozzle ring and the separator must be adapted to the higher gas flow. This feature reduces energy and wear in the crusher.

21-02-2012 om 03:29 geschreven door annazhao356  

To quote a wise crusher operator, Crushing is not just about tons per hour; it's about safe tons per hour.' But consider that a safe workplace is not achieved via mere lip service and signage, but rather from the right mindset--from owners, managers and workers--and from the manufacturers of each piece of processing equipment.

Importantly, manually digging out the crusher before repairs or restarts puts workers in dangerous positions. The Mine Safety and Health Administration (MSHA) has reported numerous injuries and fatalities incurred when climbing in or under the jaw to manually clear, repair or adjust the typical older-style jaw crusher. As such, a welcome market entry is that of modern crusher design, derived from a major impetus to put safety first while also meeting demand for far greater productivity and ease of maintenance.

Whether a crusher is jammed by large material or uncrushable debris, or stalled by a power failure, the chamber must be cleared before restarting. Manual clearing is a lengthy and risky task, especially since material can be wedged inside the crusher with tremendous pressure, and dislodging poses much danger to workers placed in harm's way inside the crusher.

The hydraulic chamber clearing system on the Model 3258 jaw automatically opens the crusher to a safe position, allowing materials to pass. Its hydraulic relief protects parts and components against overload damage, and its hydraulic adjustment reduces maintenance time and maintains safe, consistent crusher output without the need for manual intervention.

Safety is a culture and should be championed by every worker in the operation. At the same time, management should respond immediately to each worker's safety concerns and successes, rather than monitoring only overall team efforts and targets. And, manufacturers should engineer greater safety as well as productivity into their units while accompanying their equipment with strong operational and safety training programs.

It has never been more important to consider the potential hazards of conventional, older-style crushers versus modern jaw crusher design. And even during today's challenging economic climate, safety should never be minimized due to a need to achieve lower prices or costs. Modern crusher design is a major development in safe material processing--one that allows operations to maximize productivity while putting safety first.

A Jaw Crusher is one of the main types of primary crushers in a mine or ore processing plant. The size of a jaw crusher is designated by the rectangular or square opening at the top of the jaws (feed opening). For instance, a 24 x 36 jaw crusher has a opening of 24' by 36', a 56 x 56 jaw crusher has a opening of 56' square. Primary jaw crushers are typically of the square opening design, and secondary jaw crushers are of the rectangular opening design. However, there are many exceptions to this general rule.

A Jaw Crusher reduces large size rocks or ore by placing the rock into compression. A fixed jaw, mounted in a 'V' alignment is the stationary breaking surface, while the movable jaw exerts force on the rock by forcing it against the stationary plate. The space at the bottom of the 'V' aligned jaw plates is the crusher product size gap, or the size of the crushed product from the jaw crusher. The rock remains in the jaws until it is small enough to pass through the gap at the bottom of the jaws.

Today's jaw crushers utilize hydraulics to do the heavy work, reducing maintenance time and keeping workers at a safe distance. The graphics below illustrate how hydraulics facilitate the toggle removal, eliminating the need for workers to access under the jaw while lowering heavy items. Hydraulics push the pitman forward and a lock-out pin is inserted through the side plate securing the pitman. The toggle is secured for lowering and hydraulic pressure is reduced in the tension cylinders, freeing the toggle. Hydraulics retract the toggle beam.

21-02-2012 om 03:29 geschreven door annazhao356  

To maximize crushing, you must marry impact and attrition actions. When size reduction begins, the material is picked up by the lower liner, moved outwardly and caught between the crushing members. The impact of the head results in reduction of material by grinding and by facture of particle-upon-particle caused by forceful relocation to the particles within the mass.

Even at the closest approach of the attrition members, the liners are still separated by a layer of small particles of substantial thickness. In most instances it has been found that a better product and greater usable quantity of desired size is obtained by increase rather than decrease of gap when it becomes a question of optimizing crusher capacity and power draw. Therefore, the setting of the crushing members is not as directly related to the size of the product required as is the setting in the cone-type crusher.

Remember that during the upward thrust of the rotating head two distinct processes combine to reduce the feed into a uniform fine product:

1. The impact of coarse particle against fine particle similar to the action of balls or pebbles in a grinding mill. The progressive structuring of cubical shaped, fine, particles is clearly shown in these two enlarged views of the attrition zone. Finely crushed particles are discharged at perimeter of attrition chamber.

2. The attrition resulting from the high surface friction during forceful relocation of the particles into smaller voids within the feed mass. In the Gyradisc crusher, the combination of impact and attrition offers the most efficient power utilization as compared to other fine crushing or reduction methods employed today.

21-02-2012 om 03:29 geschreven door annazhao356  

With the constant growth of china's economic construction, domestic real estate and domestic highway have made rapid development, crusher industry as well. The sales and market of the cone crusher also gradually blossom and the sales volume have significantly improved far more than previous years.

It is tempting that cone crusher has a very big application prospect. The root cause lies in the special design and the great performance. Moreover, cone crusher is a new machine of energy saving, low cost, high productive capacity. The cone crusher has novel design principle and adopt new crushing technology, which can meet the different materials, different specificationes of crushing, and meet requirements of the new process 'more crushing & less gridding'. The crushing ratio of Cone crusher is bigger, the granularity is fine and uniform and lower unit power consumption.

This is of importance to operate properly crusher in use, which concerns the working life of the crusher parts and the crusher. The following is the do's and don'ts.

(1) The starting and the stopping of cone crusher

A. cone crusher should match the appropriate starting motor according to the model of crusher.

B. cone crusher should be sequentially started up and closed down.

C. when it starts, cone crusher inside should be empty. After the crusher remains stable, it is the time that feed in stuff. Feeding in stuff by equality and can't operating by overload.

D. before stopping the crusher, feeding in stuff should be stopped. By now, the crusher can be stopped; when the all stuff in the crusher was to be discharged.

(2) Feeding stuff

A. the stuff that is prepared to put in crusher should comply with the technical requirements; the size of stuff must not exceed the prescribed scope. The Moisture content in related to the property, both the proportion must not more than 15%, so as not to block the machine’s mouth.

B. feeding the stuff equably, thus can increase the effect of crush and imporve the work contition.

(3) Discharge

A. discharge opening should ensure clearance, in order to avoid causing the overloading accidents because of dischage difficultly.

B. the cone crusher should be inspected termly. If the size of stuff is not comply with the specified size, then should inspect the wear condition of the hammer, lining plate and the tension situation of V-belt. When those problems are found, worn parts are replaced and the tensile force of V-belt is adjusted.

Compare to the traditional crusher equipment, those advantages, such as the bigger crushing ratio, fine granularity, lower power consumption, crushing anything hard brittle matters etc, make the cone crusher to be an ideal, energy saving, superfine crushing equipment.

21-02-2012 om 03:29 geschreven door annazhao356  

Rock crushers--also called non-metallic mineral processing plants--are credited with a variety of environmental impacts: air pollution; ground and surface water contamination; solid and hazardous wastes; increased traffic to and from mining sites; and scenic degradation. As a consequence of these impacts, rock crushing plants in the United States are subject to federal, state and local environmental laws and permitting requirements.

Ground and Surface Water Contamination

Another important environmental impact of rock crushers is water pollution from sediment runoff, particularly in temperate climate zones. Excess sediment clogs streams, causes flooding and harms fish; sediment runoff into storm water sewer systems can also cause problems.

In drier climates, where groundwater is in short supply, the quantity of water necessary for rock crushers to wash equipment and control dust may strain the local water supply. The National Pollutant Elimination Discharge System (NPDES) program regulates water pollution from rock crushers.

Increased Traffic

Rock crushers can result in a significant increase in traffic and hazardous conditions for motorists on highways, as trucks filled with gravel or other material, often uncovered or loosely covered, enter and leave the processing plants many times per day. This increases the quantity of airborne particulate matter (dust), diesel exhaust fumes and other air pollutants in and around the vicinity of the plants.

Air Pollution

Air pollution from dust (also called particulate matter) is the No. 1 environmental impact of rock crushers. Minute particles of dust--10 microns (.0004 inches or .01 mm) or less in diameter, called PM10--can damage the lungs. Dust from rock crushing facilities can coat nearby residential and office buildings.

Scenic Degradation

Rock crushers can destroy scenic views in areas where mining facilities abound, such as occurs around some large cities in New Mexico, as noted in a 2004 study by the Center for Science in Public Participation.

Other ambient impacts from rock crushers include bright lights from facilities that operate at night and loud noises from equipment operation that can be heard up to a mile away.

21-02-2012 om 03:28 geschreven door annazhao356  

In mining operations, the layout of crushing plants and ancillary equipment and structures is a crucial factor in meeting production requirements while keeping capital and operational costs to a minimum. This paper addresses the critical design parameters as well as the consideration of ore characteristics, geographical location, climatic conditions, expected operational life, expansion potential, safety, environment, and operability and maintainability.

The fundamental goal for the design of a crushing plant is an installation that meets the required production requirements, operates at competitive cost, complies with today's tough environmental regulations, and can be built at a reasonable price despite the rising costs of equipment, energy and construction labor.

There are three main steps in designing a good crushing plant: process design, equipment selection, and layout. The first two are dictated by production requirements and design parameters, but the layout can reflect the input, preferences and operational experience of a number of parties.

Crushing plants must be designed for ease of access and maintainability if they are to meet their production goals. Keeping maintenance requirements to a minimum helps achieve higher overall operating availability. Scheduled preventive maintenance at crushing plants involves a number of elements, including: crusher wear parts, screen decks, feeder wear parts, conveyor skirting and adjustment, Oil and lubrication, conveyor belt repair, visual inspections, electrical and instrumentation adjustments.

Building for cold-weather operations is very challenging, as is designing a plant in a desert environment. This is particularly true when year-round operation is required. Seasonal variations can change ore moisture content, so the crushing plant must be adaptable to changes in the material flow characteristics. Higher moisture requires greater angles of withdrawal, and stoneboxes must be designed to avoid plugging. The crushing plant equipment itself must be adjustable to climatic changes; for example, screen decks must be designed to maintain production, possibly by using wire mesh during the wet season and plastic during the dry. Vary screen deck types dependent on seasons and material characteristics to achieve maximum passing through deck openings.

Equipment suppliers are offering ever-larger primary crushers, with 1,800 mm (72 in) gyratories expected soon, as well as secondary and tertiary machines of up to 3,000 mm (120 in).

21-02-2012 om 03:28 geschreven door annazhao356  

Mining is a process by which the earth is drilled, usually by heavy machinery, to extract minerals and other materials from beneath the soil. Mining is carried out to retrieve a number of substances such as coal, gold, iron, diamonds, potash and uranium. While mining yields important substances for sale and industrial production, mining also affects the natural environment.

Ecosystems are affected by the physical perturbations of mining operations, as well as the chemical alterations in soil and water. Mining activities vary, but can include soil compaction and conversely, removal of the topsoil. These alterations disrupt nutrient dynamics by minimizing the availability of nitrogen and phosphorus, lower the pH through the acidification of the soil and can introduce toxic metals and acids. Depending on the scale and nature of the mining operation, these effects can be localized to the location of the mining or, through local hydrology, can extend to nearby aquatic systems, such as stream, wetlands and lakes.

All mining activities create considerable waste, including acid runoff and chemical byproducts of refining. Coal mines are particularly prone to acid runoff. When large amounts of rainwater enters functioning or abandoned mines, the water becomes acidic and contaminated with heavy metals. The Environmental Protection Agency estimates that 40 percent of western U.S. watershed have been contaminated by mine waste. In the United States, the mining industry is the top toxic polluter. The problems are frequently more pronounced in under-regulated developing countries, where mining companies can be free to pollute with impunity. Water pollution from mines has been known to decimate aquatic life, and seriously impact bird and mammal populations. Water sources used by humans have also been contaminated, posing serious risks to human health.

Mining operations often contaminate the soil with toxic heavy metals and acids. Acids can lower the pH of the soil, preventing plants and soil microorganisms from thriving, and can also react with various minerals in the soil that are required by plants, such as calcium and magnesium. The hydrogen ions from the acid absorb the soil particles, preventing other nutrients required by plants to remain in the soil. These chemical alterations can interact with soil compaction. Because water isn't moving through the soil profile, some of the metals and acids can get carried away by the water, extending the mining effects throughout greater portions of the landscape. Elkins, Parker, Aldon and Whitford report in their article 'Responses of Soil Biota to Organic Ammendments in Stripmine Spoils in Northwestern New Mexico,' in the 'Journal of Environmental Quality,' 1984, that the addition of organic matter to mined lands can increase water retention in the soil, as well as the microbial process of nutrient accumulation and processing, potentially offsetting and minimizing the ecosystem effects from mining operations.

Mining releases particles of various kinds into the air, which has an impact on air quality. Some of these substances are harmless, such as dust particles, while others can be potentially dangerous. Dangerous particles include arsenic, cadmium and lead. Over time, and in sufficient quantities, these dangerous particles can have an effect on human health, especially respiratory health. Emphysema is one potential effect of prolonged inhalation of dangerous particles. These particles can also be ingested or absorbed through the skin.

20-02-2012 om 09:16 geschreven door annazhao356