Note: Cross posted from sbmzhcn.

http://sbmzhcn.appspot.com/2010/09/2/297001.html

MTW European Trapezium Grinding Mill  is designed by our experts according to advices and suggestions from customers of YGM9518 grinding mill and their long-term experiences. This grinding mill obtains international advanced technology as well as many proprietary intellectual property rights. This series of grinding mill has arrived the top technical level in the world with many patented technology and has made great efforts to the industry of grinding mill.

MTW Trapezium grinding mill Application:
MTW European Trapezium Grinding Mill is mainly applied to the powder processing of mineral products in the industries of metallurgy, construction materials, chemical, and mining, etc. This ball mill  can produce powder from various non-flammable and non-explosive mineral materials with Moh’s hardness below 9.3 and humidity below 6%, such as quartz, feldspar, calcite, talcum, barite, fluoride, Xircom, cinder, white lime, cement clinker, activated carbon, dolomite, granite, soft coal, coking coal, lignite, magnesia, chromium oxide green, gold ore, red clay, clay, kaolin, coke, coal Gangue, porcelain clay, kyanite, fluorspar, bentonite, medicinal stone liparite, diabase, pyrophyllite, shale red stone, emeraldite, basalt, gypsum, graphite, carborundun, heat insulating material, etc.

Technical Advantages:
This series grinding machine is vertical structure; takes small area; strong whole-set. Moreover the main unit transmission device uses the airtight gear box, and the transmission is steady. The important part of grinding machine uses high quality steel, therefore complete machine is durable and reliable. The mill electric system uses centralized control, advanced and reasonable shape, high automaticity, small and light vibrating feeder, easy to adjust and energy saved.

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Note: Cross posted from dotnode001.

http://crushers.dotnode.com/2010/09/01/how-about-ball-mill/

Material being broken, then to smash the ball mill is critical equipment, it is widely used in building materials, chemicals, metallurgy, ceramics, electricity and mineral processing industry, mainly used for grinding various materials.

Uses: The machine used in cement, refractories, chemicals, nonferrous and ferrous metals such as factories, mines and industrial sectors are for grinding various ores and other grinding materials used.
The machine consists of feeding part, discharging Department, Rotary Department, Transmission Division (reducer, small transmission gear, motors, electrical control) and other major components. Hollow shaft with steel casting, lining Replaceable, slewing gear hobbing by casting process, the body inlaid cylinder liner wear, has good wear resistance. The machine running stable, reliable work.
Note: According to the ore material and scheduling methods, choose dry mill and wet lattice-type ball mill.

Use of the whereabouts of grinding media (such as steel balls, pebbles, etc.) as well as the impact of the role of the inner wall of grinding media and grinding and the abrasive material grinding and mixing. When the ball rotates, as grinding media and grinding friction between the inner wall. The grinding body according to the direction of rotation and then bring down. Ball mill This material was crushed on a continuous basis. According to the shape of the body can be divided into cylindrical grinding, taper grinding ball and tube (also known as tube mill) three.

Advantages are:

(1) can be used for dry grinding or wet grinding;
(2) good operating conditions, grinding machine in a confined within, there is no dust flying;
(3) reliable operation, grinding body cheap, and easy to replace;
(4) Intermittent operation can also be a continuous operation;
(5) smash explosive materials, the mill can be filled with inert gas instead of air.

Disadvantages are:

(1) volume of bulky;
(2) running a strong vibration and noise, must have a solid foundation;
(3) low efficiency, greater energy consumption;
(4) abrasive body and the body of the friction loss large, and will stain products. Crush the hard materials are widely used materials.

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Note: Cross posted from sbmzhcn.

Permalink: http://sbmzhcn.appspot.com/2010/09/1/265001.html

1 The principle of automatic control system for milling process overview

Automatic control of the ball grinding mill powder size of purpose is to control the ball mill, the possible to improve the quality of products of powder. Using the computer control system of the grinding technology can improve the productivity, improve the control accuracy.

1.1 The principle and operating characteristics of ball mill

Usually the ball within a ball. Wall lining has wavy manganese steel armor of cylinder. Cylinder side as raw materials imported and wind blowing on the other side of the import, export for gas mixture of powder. The motor and reducer cylinder rotate speed, turning device with centrifugal and polishing in under the action of forces, armor will ball and raw material up to a certain height. Then use gravity free fall. Raw materials are mainly ball shatter, but also affected by steel ball and armor between, between the extrusion and grinding. A good FenZi grinding materials, mixing system into the next procedure. For running after a ball. Noise signal, the population pressure difference and relationship between output (see figure 1)

When the ball when the increase in quantity. The increasing power of ball mill, but until the noise signals, basically is found by large slope down. With the increasing of quantity of ball mill, export differential pressure also slightly increased. When feed greater depth. Differential pressure is rising sharply.

According to the curves shown in figure 1 characteristics can be seen. The noise signal is ball mill can reflect the quantity of materials. In the ball speed constant, the ball is a certain period, by measuring the grinding machine, the noise signal can be directly within the ball mill detection of materials. Therefore, the stability of the grinding machine for shoes. Control air purging, make their relationship, it can control the equilibrium of the grinding mill.

1.2 Difficult to control the ball milling

1) from its existing mill run characteristics. Noise is a variation of parameters, it is significant for mill materials. But because the ball inside the operating conditions of complex and measurement methods have greater error. So the control scheme in composition may have some limitations.

2) the grinding mill control system is more people, more than the output variables and strong coupling, large inertia, large delay of time-varying system. Using common PID control force lacerates the relationship between the variables. Not only get better effect, but also is caused extremely easily system stability.

3) the grinding ball control, except for shoes, accused of parameters for air outside disturbance. Also, the grain size ball and the effect of water content.

2 Grinding process is sub

General grinding system operating first kind is to use of ball mill for export pressure difference control parameters, the second kind is to use manual operation. Depend on the experience, the operator control over two methods, the existing control precision grinding low volatility of particle size, quality and yield of grinding is difficult to control. The quality of products.
Two of the automatic control system

Control system is composed of two parts, hardware and software are introduced as follows:

2.1 control system software

The software is used to control strategy of human-simulated intelligent control scheme. It is based on the principle of intelligent control, imitation of man’s thinking on intelligent decoupling, ball mill in order to ensure the safe and reliable operation, the software is the core logic by intelligent controller and intelligent algorithm.

Intelligent design according to the logic is running the operation experience, according to the input error and its variation formulate corresponding control strategy, the principle is: (1) the noise signals according to the ball, adjusting control of disc feeder under shoes. Make quantity to achieve stability.

(2) adjust air control two loop baffle, its balance. Intelligent algorithm according to the ball mill system controller is the coupling, the controller can be divided into three sons, each loop circuits using intelligent algorithm based on the input, and the changes of choose corresponding algorithm and achieve the purpose of humanoid control.

2.2 control system of the hardware

Control system hardware consists of: PLC and computer, isolation and transducers, inverter, noise and transform device, flowmeter, electric baffle valves, electric butterfly valve, pressure transmitter such equipment. A new form of the control system can fully test the key parameters of grinding process, through these parameters to PI C and computer provide enough information to control system, comprehensive treatment, and to form a correct judgment, provide accurate control signal, make grinding system according to the requirements of control in advance to work.

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Jaw crusher  is a widely used stone crusher. jaw crushers are configured for primary crushing of even hardest rock. Our jaw crushers are crushing without rubbing minimum dust oil lubrication, devise having oil or grease lubrication system. SBM crushers are designed for long life service with minimum maintenance for hard, tough, abrasive material and overload high capacity. This service goal has been confirmed by our customers all over the world.

A jaw or toggle crusher consists of a set of vertical jaws, one jaw being fixed and the other being moved back and forth relative to it by a cam or pitman mechanism. The jaws are farther apart at the top than at the bottom, forming a tapered chute so that the material is crushed progressively smaller and smaller as it travels downward until it is small enough to escape from the bottom opening. The movement of the jaw can be quite small, since complete crushing is not performed in one stroke. The inertia required to crush the material is provided by a weighted flywheel that moves a shaft creating an eccentric motion that causes the closing of the gap.

Single and double toggle jaw crusher are constructed of heavy duty fabricated plate frames with reinforcing ribs throughout. The crushers components are of high strength design to accept high power draw. Manganese steel is used for both fixed and movable jaw faces. Heavy flywheels allow crushing peaks on tough materials. Double Toggle jaw crushers may feature hydraulic toggle adjusting mechanisms.

Flexible discharge opening setting of jaw crusher allows perfect match with relative equipments.  jaw crusher is easy to install, operate and maintain. As per Feedback, our experts will make continuous improvements on our products to meet customers’ changing needs. Jaw crusher is widely used in fields of mining, metallurgy, construction, smelting, hydropower and chemical industries etc.
Features:
1. The application of world-class manufacturing processes and high-tech materials.
2. Integrated steel structures are used for the base of bearing;
3. The broken cavity using "V"-shaped structure, so that the actual width of feed is same as nominal width;
4. The broken cavity is deep and without dead zone, increased capacity and output feed;
5. Lubrication system is safe and reliable, convenient of replace parts, easy to maintenance;
6. The outlet employs pad-style adjustment devices, convenient and reliable, and increase the flexibility of the equipment;
7. Low noise, less dust;

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Vertical Roller Mill is a new kind of large scale power mill which is designed specially to solve the problems of low capacity and high consumption of industry mills. With a decade of years’ research of mills, Vertical Roller Mill is designed and manufactured based on our advanced design idea, and in combination with the European technology and the market demand. It adopts reliable structure and reasonable process flow, integrated with drying, milling, classifier , elevator. Especially ,it can fully meets the requirement of clients in the high production of powder and its main technical and economy indicator reaches the international level.

Since the 1980’s, cement plants are increasingly looking to vertical roller mill technology for their finish grinding needs. Vertical roller mills present a compact and efficient grinding method. Clinker and gypsum is ground on a rotating table that passes under large rollers. Material is forced off the table by centrifugal force, where it is then swept up into an airstream to a classifier immediately above. Just as with a ball mill, material that is too coarse is returned to the table for additional grinding while material that is fine enough is collected as product. The compact design of a vertical roller mill allows it to dry, grind, and classify, all within one piece of equipment and all in a relatively compact space. Vertical roller mill technology allows: (1) power consumption savings; (2) consistent product quality and (3) process simplification.

1. Cost Savings

The single largest energy consumption point in the manufacture of portland cement is in the finish milling process. A reduction in power consumption here makes a dramatic impact on the plant’s overall power consumption. VRM technology makes significant power reductions possible by more efficient grinding.

2. Quality

Vertical roller mills create a particle size distribution with a sharper cut in comparison to cement milled in a traditional ball mill. That is, the particle size distribution is in a narrower band. This sharper cut means potentially less variability in product consistency and, hence, more predictable results in product performance.

3. Process Simplification

By changing various vertical roller mill operating parameters, significant adjustments in the particle size distribution, retention time, and fineness of the finished cement can be achieved. This can help with plant operations as production is switched between different cement types.

In light of these issues, vertical roller mills are becoming a popular choice for both existing ball mill conversion and new mill construction. From 2000-2002, 56% of the mill orders (comprising both raw mills and finish mills) came from vertical mills – compared to 32% for ball mills. Clearly vertical roller mills are an increasingly attractive option for improving production, lowering energy costs, and maintaining product quality.

Vertical roller mill working principle

Flow of material through the Vertical roller mill of the separator when, the motor will drive the plate to rotate by the reducer and then the materials will fall down on the central place of the plate from the inlet by the qir-locking feeder .While at the same time ,the hot air will enter the grinder from the air inlet. With the rotation of the plate, the materials will move to the edge of the plate by the centrifugal force and the materials will received the pressure from the roller and be crushed when it passes the circle ring sink on the plate. And the coarse powder will fall down from the cone hopper and then repeat this kind of process when materials in the air stream passes the upper separator by the effect of the rotors .And during the process ,the fine powder will flow out with the air stream .By the dust catcher ,the final products will be collected .The materials with moisture will be dry when it contact with the hot air stream. By adjusting the temperature of the hot air, we can satisfy materials with various moisture degree ,thus achieving the required products moisture. By the separator, we can also achieve the required coarse and fine degree of the products.

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Vertical roller mill ( grinding ) is the dawn of Heavy Industry and Technology to address the industrial mill output is low, energy consumption and higher technical problems, absorb advanced technologies combined with our years of design and manufacture of advanced mill concept and market demand, after years of concentrated design improved Large grinding equipment . Vertical roller mill using reasonable and reliable structural design, with advanced technological process, set drying, grinding, powder selection, improve the integration, especially in the large grinding process, can meet customer demand, the major technical, economic indicators reached the international advanced Level .

Vertical roller mill applications

• Special glass fiber industry ’s largest high yield pyrophyllite powder fineness of grinding ;
• Private coal gangue powder industry powder produced a large output ;
• Special chemical industry raw materials, high production of various chemical powder production;
• Non-metallic mineral industry, a variety of low, medium and high hardness of the hundreds of species of large-scale ore powder production preparation;
• Hundreds of species of other big industry production of a variety of materials, powder preparation;

Vertical roller mill Features:

• operating costs low:
  1. mill efficiency, vertical roller mill with roller compacted ground and feed bed materials, low energy consumption, milling system power consumption 40-50% lower than the milling system, and with the increased humidity of raw materials, section Electric effect is more significant.
  2. metal loss, liner and roller with a special material, long life, reduced operating costs, high utilization ;
  3. into the grinding material particle size of up to roller diameter of about 5%, usually 40 ~ 100 mm, it can be saved two medium-sized vertical mill grinding.
• construction costs low:
  1. The grinding process is simple, and milling system can be reduced compared to an area of about 50%, reduced by about 70% of construction costs, building size, occupy less space .
  2. set of broken grinding, drying, grinding, grading conveyor in one, the system is simple, compact . Can open layout, making low-cost construction .
• easy and reliable operation :
  1. with a control device, can realize remote control, easy to operate .
  2. The roller cover and the disc has to prevent direct contact liner quality control device, to avoid fragmentation of severe vibration .
• drying ability, vertical mill using air transportation of materials, the grinding of materials for large water inlet temperature can be controlled so that products reach the final water, drying in the grinding of water up to within 12 to 15 % of the material, even drying Dry milling, drying only water for 3 to 4 % of the material .
• stable quality, uniform particle size distribution . Material in the mill residence time is short, easy-to- size and chemical composition of the product testing and control, product quality and stability .
• easy maintenance, through the maintenance tank, turn rotating arm, roller, liner can be replaced in a very short time .
• environmental protection, energy saving ; vibration, low noise, low dust, clean operating environment to meet the requirements of environmental protection .

Source Article:http://sbmzhcn.appspot.com/2010/08/31/245002.html

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Vertical Roller Mill Technology Advantages:
1. Cost Savings
The single largest energy consumption point in the manufacture of portland cement is in the finish milling process. A reduction in power consumption here makes a dramatic impact on the plant’s overall power consumption. VRM technology makes significant power reductions possible by more efficient grinding.
Vertical Roller Mill Technology Advantages: 1. Cost Savings The single largest energy consumption point in the manufacture of portland cement is in the finish milling process. A reduction in power consumption here makes a dramatic impact on the plant’s overall power consumption. VRM technology makes significant power reductions possible by more efficient grinding. 2. Quality Vertical Roller Mill create a particle size distribution with a sharper cut in comparison to cement milled in a traditional ball mill. That is, the particle size distribution is in a narrower band. This sharper cut means potentially less variability in product consistency and, hence, more predictable results in product performance. 3. Process Simplification By changing various Vertical Roller Mill operating parameters, significant adjustments in the particle size distribution, retention time, and fineness of the finished cement can be achieved. This can help with plant operations as production is switched between different cement types. In light of these issues, vertical roller mills are becoming a popular choice for both existing ball mill conversion and new mill construction. From 2000-2002, 56% of the mill orders (comprising both raw mills and finish mills) came from vertical mills – compared to 32% for ball mills. Clearly vertical roller mills are an increasingly attractive option for improving production, lowering energy costs, and maintaining product quality. Vertical Roller Mill Structure and function : The main structure consists of separator ,roller, mill table, pressurization device, deceleration machine, motor, shell body, etc. Separator is an important part which determines the size of the final powder.It is composed of gearing with adjustable speed , rotor, guiding vane, shell body , cone filler for coarse powder, blower. It is a kind of powder collector with high-efficiency , low powder consumption and convenience. Roller is the main part to grins the materials into powder. Vertical Roller Mill is equipped in the curving arm of the mill. In virtue of the outside force, It pressed the materials on the table tightly. Driven by the mill table ,the roller runs, so the materials are grinded into pieces. The mill table is fixed at the output shaft of the deceleration machine. At the upside of the table is the hoper with an annular groove in which the materials are grinded. The pressurization device brings the grinding pressure. It contains oil pressure station, pull rod of hydraulic pressure for grinding. Deceleration machine carries powder. The rotate speed of the mill table is the machine’s output speed. According to the position of humidifier and dust collector. Our company can provide 2 allocation :three blower system and double blower system. This vertical grinder collect the finished products by whirlmind dust catcher. This configuration can reduce the working negative pressure and the volume of gas which through the dust catcher. In vertical grinder can use electrical dust catcher ,also bag dust catcher as terminal dust removal plant. By using the electrical dust catcher and bag dust catcher ,the gas can directly go from grinding into dust catcher. This construction can reduce the quantity of equipments and also simplify the allocation. Vertical Roller Mill Working principles : The motor dives the grinding table to turn through the speed reducer. At the same time, hot air comes into the roller mill from the air inlet. The materials fall down the centre of grinding table from the feeder. Because of the centrifugal force, the materials move to the edge of grinding table from the centre .
The materials are crushed by the grinding roller when by pass of the groove on the grinding table. The crusher materials continue to move to the edge of the grinding table until taken away by the airstream. Then the bigger materials fall down the grinding table and the process of crushing continues. When the materials in the airstream pass the separator on the top of the mill, the materials fall down the grinding table from the taper filler under the force of guide leaf blade.

Vertical Roller Mill

The fine powder comes out with the airstream, and is gathered by the dust catcher of the system. The powder gathered is the final product of roller mill. In the process of the contact of airstream , the materials are dried to meet the clients’ need at the proper moisture.Through the adjustment of the angle between the separator and the leaf of wind’s direction (not suitable to the small type of vertical mill), and also the speed of the separator rotor, it can reach the proper fineness of the materials.

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