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.

22-02-2012 om 03:48 geschreven door annazhao356  

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.

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

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.

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

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.

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

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.

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

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.

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

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