Factors of gear wear of ball mill
According to the investigation, when the ball mill is in operation, most of the components are running very well, except that the large and small gears of the ball mill are frequently worn out, and the scrap rate is very high, which increases the production cost. So what causes the gear wear of the ball mill?
1. Poor lubrication conditions: In actual operation of the ball mill, the lubrication effect of the gear lubrication points is not ideal, because as the gear rotates or the speed increases, most of the grease does not enter the gear surface under the action of centrifugal force. It was thrown to the gear cover, and dropped onto the surface of the gear in the vibration of the gear cover, and was still directed to the gear cover, and finally fell to the bottom of the gear cover. As a result, the gear meshing parts have poor lubrication conditions, and dry friction or boundary friction will occur at the local meshing points of the tooth surface, causing serious wear and failure of the gear surface.
2. Frequent slurry leakage of the equipment: During the operation of the ball mill, due to improper operation or improper maintenance, there is a slurry leakage in the ball mill, and the slurry enters the gear without being cleared in time, causing the gear to wear; or the threaded hole at the hole cover of the ball mill is leaking. Pulp, causing gear wear.
3. Poor sealing performance: If the performance of the sealing element of the ball mill is too poor, a large amount of debris will enter the grease during operation, such as excessive mineral pulp, powder particles and other impurities. As a result, the gear lubrication conditions are worse, aggravate the wear of the gear, shorten the operating life of the gear, and increase the user's production cost.
4. The installation accuracy cannot be achieved: Although the ball mill has a simple structure and high manufacturing and installation accuracy requirements, when installing the gear of the ball mill, the manufacturing process and installation methods must be emphasized. If the lubricating oil is not added in time during installation to relieve the friction of the installation, the wear will be increased and the service life of the ball mill gear will be short.
Types of dust collector
Dust collector is a dust removal equipment that separates dust from flue gas. The performance of the dust collector is expressed by the amount of gas that can be processed, the resistance loss when the gas passes through the dust collector, and the dust removal efficiency. At the same time, the price of the dust collector, operation and maintenance costs, the length of the service life and the difficulty of operation and management are also important factors to consider its performance.
Dust collectors are divided into the following categories according to their principle of action:
- Filter type dust collector, including bag filter and particle layer dust collector, etc.
- Electrostatic precipitators.
- Magnetic dust collector.
Dust collectors are divided into:
- Dry dust collector;
- Semi-dry dust collector;
- Wet dust collector.
The working principle of the dust collector:
After the dust-containing gas enters from the upper air inlet of the ash hopper, under the action of the wind baffle, the air flow flows upward, the flow rate is reduced, and some large particles of dust are separated and fall into the ash hopper due to inertial force. The dust-containing gas enters the middle box and is filtered and purified by the filter bag, and the dust is trapped on the outer surface of the filter bag. The purified gas enters the upper box through the filter bag mouth and is discharged from the air outlet. The most commonly used in modern industry are: electric bag compound dust collector and bag dust collector.
The electric bag compound dust collector is installed in a box, with a short electric field installed at the front end and a filter bag field installed at the back end. The smoke and dust are introduced from the left end and pass through the electric field area first. The dust particles in the electric field area are 80%-90% charged. Dust is collected (use the advantages of electric dust removal to reduce the load on the filter bag field). The flue gas passing through the electric field enters the filter bag area for secondary filtration, and enters the inner cavity of the filter bag through the outer surface of the filter bag. The dust is trapped on the outer surface of the filter bag, and the pure gas is discharged from the inner cavity into the flue. Exhaust from the flue.
The electric bag compound dust collector combines the advantages of the electric dust collector and the pure bag dust collector, and is a new generation of dust removal technology.
Precautions for the use of dust collector:
During use, prevent the gas from cooling below the dew point temperature in the bag chamber, especially when using the bag filter under negative pressure. Because the shell often has air leakage, the air temperature in the bag room is lower than the dew point temperature, and the filter bag will be damp. As a result, the dust is not loosely attached to the filter bag, but sticky to the filter bag, resulting in a paste. The bag cannot remove dust, and the holes of the filter bag are blocked, causing the cleaning failure, and the pressure drop of the dust collector is too large, and the operation of the dust collector cannot be continued.
Reasons for the lower and lower output of ball mills
- "Saturated grinding" is the main reason that affects the output of ball mills
When the output of the ball mill is getting lower and lower, the first thing to consider is whether there is a phenomenon of "saturated grinding". The causes of "saturated grinding" are: too much feed; the hardness and particle size of the grinding material become larger; The material has too much moisture; the steel ball grading is unreasonable; the compartment board or the grate is blocked by debris. The solution to the "full grinding" problem: reduce the amount of feed; when the size or hardness of the grinding material changes, make corresponding adjustments in time; adjust the water content of the grinding material; reasonably configure the large, medium, and small steel balls Than; clean up the blockage of the compartment board or grate seam; increase the ventilation of the ball mill cylinder.
- The working time of the ball mill is too long
The length of the milling time directly affects the product composition and purity, and the impact of the milling time on the particle size is also obvious. In the initial stage, with the extension of time, the particle size decreases faster, but after the ball milling for a certain period of time, even if the ball milling time continues to be extended, the particle size value of the product does not decrease too much. Different materials have different optimal ball milling times. On the other hand, the longer the milling time, the more serious the pollution caused, which affects the purity of the product.
- Failure to add steel balls in time
The grinding effect of the ball mill and the output are restricted by the steel balls of the ball mill. With the grinding and impact of the steel balls in the cylinder, the steel balls will wear out. Therefore, the steel balls must be added in time to ensure the output of the ball mill consistency.
- The temperature in the cylinder rises
The temperature of the ball mill increases during operation, the effective strain of the ball mill to form nanomaterials is reduced, and the crystal grain size increases, which significantly affects the mechanical properties of the powder made into bulk materials. Moreover, whether the final product of ball milling is solid solution, intermetallic compound, nanocrystal, or amorphous phase, diffusion is involved, and diffusion is affected by the grinding temperature, so temperature is also an important factor affecting the output of the ball mill.
- The material moisture content is too high
Due to the large moisture content of the material, the uniformity of the feeding is affected and the feeding time is prolonged. Secondly, because the wet material is fed too much, it may cause the phenomenon of paste ball and paste liner in the mill, and even "full grinding" will be forced to stop the grinding process. Generally speaking, for every 1% increase in the comprehensive moisture of the material entering the mill, the output of the ball mill will decrease by 8%-10%; when the moisture is greater than 5%, the ball mill basically cannot perform grinding operations.
- Addition ratio of grinding aid
Grinding aids are allowed to be added in the cement production process, but the addition amount should not exceed 1%. Adding more than this standard is unreasonable. In addition, most of the grinding aids are substances with strong surface activity, which are not suitable for all materials. They should be added reasonably according to the nature of the materials.
To sum up, if the output of your ball mill is getting lower and lower, first check whether the "full grinding" phenomenon occurs. If not, then perform investigations based on other reasons to find the crux of the problem, and then you can fundamentally solve the problem of low output. The problem caused the ball mill to resume production as soon as possible, bringing greater economic benefits.
The fineness and purity of the jet mill are the main performance "highlights"
The jet mill has various properties such as winnowing type, no screen, no net, uniform particle size, etc., and the production process is continuous. This machine has reached the international advanced level and is widely used in the grinding of materials in the pharmaceutical, chemical, food and other industries. It is suitable for the grinding of various non-metallic minerals, cement, building materials and other brittle materials. It can also be used for some materials difficult to achieve grinding fineness. The jet mill adopts purified and dry compressed gas, which is jetted into the grinding chamber at a high speed through a special supersonic nozzle. The air flow carries the material at high speed, causing strong collision, friction and shearing between the material and the material to achieve the purpose of grinding.The ground material rises into the classification chamber, the material that meets the particle size requirements passes through the forced impeller classifier, and the particles that do not meet the particle size requirements return to the grinding chamber to continue grinding.
The entire production process is fully enclosed and continuous operation, no dust pollution, and the air is purified after dust removal and filtration. The grinding principle of the jet mill determines the typical characteristics of the machine such as wide application range, fine particle size and high product purity. It can be matched with inert gas to form a new type of inert gas closed-circuit protection grinding production line, which is widely used in flammable, explosive, easy to oxidize, etc. grinding processing of materials.
The reason why the jet mill is favored by the majority of users is mainly because it has many "highlights", one is "fineness", as the name suggests is how fine the jet mill can grind, and the application requirements of various industries are different, how Achieving the established fineness is the primary consideration when designing and manufacturing. Various materials require different grinding fineness, depending on the applicable industry and the requirements for material grinding. The second is "purity", which requires no pollution during the grinding process and the original composition should be maintained. Many materials will have some chemical effects during grinding due to temperature, humidity and other reasons, especially in the pharmaceutical industry of Chinese herbal medicine grinding, this is even more important. Therefore, the temperature, humidity and other conditions of the material must be considered in the design. The airflow of the jet mill must have a high speed in order to generate a lot of energy. Therefore, increasing the air velocity of the nozzle is beneficial to improving the material grinding effect and grinding efficiency. However, if the pursuit of high speed is too high, energy consumption must be increased.
Factors affecting the performance of cyclone dust collector
There are many factors that affect the performance of the cyclone dust collector. Generally speaking, one is the structure factor, and the other is the operating condition factor.
The structural factors are generally divided into four aspects:
- Entrance and top
1) The inlet form is generally divided into two types, direct inlet and vortex inlet.
2) The top of the dust collector is usually flat, but there are also raised and spiral types.
- Exhaust pipe
The exhaust pipe of ordinary cyclone dust collector is mostly cylindrical and concentric with the body of the dust collector. The shorter the insertion depth of the exhaust pipe, the lower the pressure loss.
- The length and diameter of the dust collector
Generally, when the ratio of length to diameter is greater than 2, it is called a high-efficiency cyclone dust collector; when it is less than 2, it is a low-type cyclone dust collector. The former is more efficient because the dust stays in it for a long time.
- Roughness of the inner wall
The rougher the inner wall of the cyclone dust collector, the easier it is to cause vortex, which will increase fluid resistance and reduce dust collection efficiency. Therefore, in the manufacturing, attention should be paid to the smooth welding seam, and the cylindrical and conical heads should strive to be smooth.
Factors in operating conditions
The operating conditions of the dust collector include factors such as gas flow, temperature, dust particle size and density.
- Gas performance
1) Gas flow: The efficiency and resistance of the cyclone dust collector are related to the flow rate of the gas into the dust collector.
2) Gas temperature: The gas temperature directly affects the viscosity coefficient of the gas. The coefficient of viscosity increases with the increase of temperature, while the dust collection efficiency decreases with the increase of temperature.
- Dust properties
1) Particle size of dust
The efficiency of the cyclone dust collector is very sensitive to the particle size of the dust. Generally, the efficiency of particles smaller than 5μm is low, while the dust collection efficiency of particles larger than 20μm is more than 90%.
2) Density of dust collection
The higher the dust density, the higher the efficiency; when the density reaches a certain value, the smaller the particles, the greater the influence of density. However, the impact on the actual dust collection range of the dust collector is relatively small.
3) Dust concentration
The dust concentration has an impact on the efficiency and resistance of the dust collector. The effect of dust concentration on the performance of the dust collector is that when the dust concentration is high, the friction loss between dust particles increases, the rotation speed of the airflow decreases, and the centrifugal drop occurs, which reduces the resistance and efficiency; but on the other hand, On the other hand, the increase of the concentration will cause the agglomeration of dust, which will increase the dust collection efficiency.
Therefore, only a sufficient understanding of the factors that affect the performance of the cyclone dust collector can better avoid performance loss and make the dust collection efficiency of the cyclone dust collector better.
What to do if the work efficiency of the ball mill is low
The ball mill is a kind of beneficiation equipment. Its main function and function is to grind and process various minerals. However, the work efficiency in the production process is very low. How to solve such problems?
- The equipment configuration is low
There is a close relationship between the level of equipment configuration and production capacity, and the higher the production capacity, the higher its work efficiency will be. At this time, the output can also meet the user's standard. Otherwise, the work efficiency will be low. Therefore, users must choose equipment with high configuration when purchasing equipment, so that the problem of low work efficiency can be easily solved.
- Poor operating performance
If the equipment is prone to problems during operation, it will inevitably affect production, and the performance of the equipment is directly related to the motor. Only a good motor can ensure the stability of the equipment, and in the actual production process Higher reliability, this move provides a hardware foundation for improving the efficiency of the equipment.
- The problem of failure rate
The production capacity of equipment with high failure rate is necessarily low. The failure of equipment is caused by technical reasons. Generally speaking, equipment with high technology content will have higher technology content. On the contrary, equipment with low technology is not enough to meet the normal production of users. This is also one of the main reasons for its work efficiency. When purchasing equipment, you must choose carefully.
- User operation
In the course of use, improper operation will also lead to a sharp decline in the production capacity of the equipment. Therefore, it is quite necessary to effectively improve the user’s operational proficiency. Therefore, various manufacturers have increased the training level of their employees. In this process, the equipment The production capacity has been greatly improved, and the output also meets the actual production standards of users.
- External environmental factors
Changes in the external environment will also cause the equipment’s working efficiency to be low, because the ambient temperature will have a great impact on production, too high or too low temperature is not conducive to production and operation, so it is necessary to install a temperature controller on the equipment and start it officially In the past, effective temperature detection was required to provide necessary preparations for improving the production efficiency of the equipment.
The application and market status of talc
The molecular formula of talc is Mg3Si4O10(OH)2, and the chemical name is hydrated magnesium metasilicate, monoclinic system. The theoretical composition of pure talc is 63.47% SiO2, MgO 31.68%, H2O 4.75%.
The properties of talc: pure talc is white or slightly yellowish, pink, and light green; generally dense block, leaf-like, fibrous or radial aggregates; glassy, translucent; hardness 1.0, specific gravity 2.58~ 2.83, melting point 800°C. Because talc is white in color, soft, odorless, tasteless, stable in chemical properties, it has high stability, low conductivity, fine particles, and has the advantages of flake structure and large specific surface area.
Types of talc deposits
According to the geological origin, it is mainly divided into carbonate hydrothermal metamorphic type, contact metamorphic type, sedimentary dynamic metamorphic type and ultra-basic hydrothermal metamorphic type.
According to the type of ore-forming parent rock, it can be divided into four types: magnesia carbonate, serpentinite, siliceous rock/aluminous rock and magnesia sedimentary rock.
According to the type of ore, it can be divided into four types: lump talc, flaky soft talc, tremolite talc and mixed talc.
The prospective reserves of talc in the world are more than 2 billion tons, and the proven reserves are about 800 million tons. Global talc (including pyrophyllite) deposits are distributed in more than 40 countries and regions, mainly in the United States, Brazil, China, India, France, Finland and Russia.
The main application of talc
- Papermaking
Talcum powder has a special layered structure with softness, hydrophobicity, strong adsorption and other characteristics. The addition of talcum powder in the paper industry can help increase filler retention and improve paper transparency, smoothness and printability, and make paper Has high ink absorption. It is lipophilic and can absorb organic substances to keep the white water and slurry system clean. As a filler, it also has the effect of eliminating resin barriers.
- Plastic
Talc is an important filler for plastics. It can improve the chemical resistance, heat resistance, impact strength, dimensional stability, firmness, hardness, thermal conductivity, tensile strength, creep resistance and electrical insulation of plastics. . At the same time, it is also a reinforcing agent for many thermoplastics, which can control the rheology of the melt, reduce the creep of molded products, increase the cycle of molding, and improve the heat deflection temperature and dimensional stability. When flake talc was used at that time, it had a good lubrication effect on the parts of the molding press.
- Ceramics
The reason why ceramics show different colors is that talc powder is added to them. Different proportions and different composition ratios can make the ceramics show different colors. At the same time, it can make the ceramics have uniform density, smooth surface and good gloss after calcination.
- Coating
Talcum powder has good suspension and dispersibility, and low corrosiveness. Therefore, in coatings, talc powder can be used as a filler and a skeleton function, which reduces manufacturing costs, and at the same time can increase product shear strength, pressure strength and Tensile strength reduces its deformation strength, elongation and thermal expansion coefficient.
- Cosmetic
Talc is a high-quality filler in the cosmetics industry. Due to its high content of silicon, it has the effect of blocking infrared rays, enhancing the sun protection and anti-infrared properties of cosmetics. In addition, because talc powder has the properties of lubrication, softness, and hydrophilicity, various emollient powders, beauty powders, talcum powders, etc. are commonly used.
- Cable
In the wire industry, special talc powder is mainly divided into two types: rubber sheathed cable-filled talc powder and special peeling talc powder for sheathed insulated wires. Lubrication and insulation.
- Roofing, waterproof material
Talc can be used not only as a filler for roofing materials, but also as a surface material for roofing materials. When used as a filler, talc acts as a stabilizer in the molten asphalt component, which can increase the stability of the roofing material and the ability to resist weathering. When talc is sprayed on the surface of asphalt shingles or rolled roofing materials, it can prevent the materials from sticking during production and storage.
- Textile
Superfine ground talcum powder is often used as a filler and bleaching agent in some textiles, such as tarps, fireproof cloths, wheat flour bags, rope nylon, etc., which can enhance the compactness of plants, and enhance heat resistance and acid and alkali resistance Performance.
- Medicine and Food
Talc powder is often used in medicine and food because of its non-toxic, tasteless, good solubility, high whiteness, strong smoothness, and soft taste. For example, it can be used as pharmaceutical tablets, sugar coatings, Chinese medicine prescriptions, prickly heat powder, and food additives. , Release agent, etc.
- Other apps
Treatment of oily wastewater to reduce water pollution hazards. It can also be used in metal smelting, building material modification, pesticide absorbents, making overall foamy latex boards, and manufacturing floor waxes, bleaches, anti-corrosion compounds, and lubricants , Joining fillers, etc.
The market status of talc
The annual output of talc in the world in recent years is about 6 million tons. From 2016 to 2018, the international trade volume was 2.87 million tons, 3 million tons, and 2.98 million tons, accounting for about 50% of the total output.
From the perspective of the export market, China is the world's largest exporter of talc. However, in recent years, due to the impact of environmental protection and rising labor costs, the export price of talc has increased year by year. The Netherlands, Germany, the United States, Japan, and South Korea are the largest importers. The United States, China, Austria, and Italy are importing countries as well as producing and exporting countries.
Consumption profile of talc
In recent decades, the formulation of tiles and sanitary ware and the technology of burning tiles have changed, reducing the amount of talc required for the manufacture of ceramic products. In coatings, the industry has shifted its focus from oil-based coatings to water-based coatings. Talc is hydrophobic and not suitable for the production of this product.
In the 1990s, papermaking began to decrease, and some talcum powder used for pitch adjustment was replaced by chemicals. In cosmetics, talcum powder manufacturers have shifted the production of some products from talcum powder to corn starch.
The paper industry used to be the world's largest consumer market for talc. As paper mills used a large amount of calcium carbonate instead of talc for papermaking, the global talc consumption structure center gradually shifted from the papermaking market to the plastics market. It is expected that in the next few years, the world's talc production and demand will grow steadily. The consumption of talc in the plastics sector will exceed that of the paper industry. As the automotive industry develops in the direction of lighter weight, the demand for automotive plastics will further increase in the future. Thereby driving the growth of the amount of talcum powder used in automobiles.
Article source: China Powder Network
The role and types of grinding media of ball mill
The function of the grinding body in the ball mill is to crush and grind the bulk materials fed into the mill into fine powder. The particle size of the material that has just entered the mill is about 20mm, and it will eventually be ground into a fine powder below 0.08mm (generally, the sieve residue should not exceed 15%). The grinding body mainly impacts the newly fed bulk materials (in the coarse grinding chamber), and grinds them as a supplement. During this period, collisions between the grinding bodies are unavoidable. The strong sound when the mill is running mainly comes from the coarse grinding chamber. As the particle size of the material decreases, it will flow to the next silo, the grinding body will turn to be mainly grinding, the sound will gradually weaken, and it will be sent out of the grinding mill after being finely ground. Different types and specifications of grinding bodies are used in different grinding chambers.
①Steel ball: a kind of grinding body widely used in ball mills. It comes into contact with the material during the grinding process and has a large impact on the material. It is mainly used in a warehouse (the feed end is also a coarse grinding warehouse) and a double warehouse. Two chambers (coarse and fine grinding chambers) for closed-circuit mills, one and two chambers for tube mills. The diameter of the steel ball is between Ф15~125mm. According to the requirements of the grinding process, the coarse grinding chamber generally selects Ф50~110mm, and the fine grinding chamber uses various specifications of Ф20~50mm.
②Steel section: In the fine grinding chamber of the mill, the material is mainly ground. The steel (iron) section can replace the steel ball. Its shape is short cylindrical or truncated cone. It has line contact with the material and has a strong grinding effect. But the impact is small, so it is more suitable for the fine grinding chamber.
③Steel rod: Steel rod is a kind of grinding body commonly used in wet grinding, with a diameter of Ф40~90mm, and the length of the rod is 50~100mm shorter than the length of the grinding chamber.
Regardless of the type of abrasive body, it has high requirements for its material: it must have high wear resistance and impact resistance. The quality of its material affects the grinding efficiency and the operation rate of the mill. The material is required to be hard, wear-resistant and not easy to break. For example, high chromium cast iron is an alloy white cast iron with high chromium content, which is characterized by wear resistance, heat resistance, corrosion resistance, and considerable toughness. Low chromium cast iron contains less chromium elements, and has higher toughness. Chromium cast iron is poor, but has good wear resistance. It is suitable for use as the liner of small balls, iron sections and fine grinding chambers.
Factors affecting the efficiency of cyclone dust collector
The cyclone dust collector enters the dust collector from the tangential inlet. The airflow rotates in the dust collector. The dust particles in the airflow move to the outer wall under the action of centrifugal force, reach the wall surface, and move along the wall under the action of the airflow and gravity. The wall falls into the ash hopper to achieve separation. There are several factors that affect the dust removal efficiency of the dust collector:
1. Air inlet area: The air inlet is an important part of the dust collector, and it also affects the efficiency of dust removal. The smaller the air inlet area, the higher the air velocity and the higher the dust removal efficiency, which is beneficial to the separation of dust and other things;
2. Inlet wind speed: Generally, the inlet wind speed is maintained at 12-25m/s. When it is lower than 12m/s, the dust removal efficiency will decrease. When it is higher than 25m/s, the dust removal efficiency will not increase significantly, but the resistance loss will increase and energy consumption will increase. . The higher the wind speed in this range, the greater the resistance and the higher the dust removal efficiency;
3. The diameter and height ratio of the cyclone cylinder affect the efficiency of the dust collector: at the same tangential speed, the smaller the diameter of the cylinder, the greater the centrifugal force and the higher the dust removal efficiency. If the diameter of the cylinder is too small, the particles will easily escape, and the dust removal efficiency will be lower. Therefore, the diameter of the air inlet of the dust collector is not easy to be too large, just appropriate, and the near air port cannot be too small. When the dust particles are large, it is easy to block the air inlet;
4. Properly lengthening the cone of the cyclone dust collector is also beneficial to improving the dust removal efficiency;
5. The influence of the diameter and depth of the ash discharge port: the smaller the diameter of the ash discharge port, the smaller the airflow, and the greater the difficulty of dust discharge, so the speed and diameter of the outlet air discharge should be accelerated;
6. Tightness of the lower part of the dust collector: Generally, there are two types of double flap valves or star-shaped unloaders for the air lock device at the lower part of the dust collector. The static pressure inside the precipitator gradually decreases from the outer wall to the center. Even if the precipitator is under positive pressure, the bottom of the cone may be under negative pressure. Air leakage from the lower part of the dust collector will take away the dust falling into the ash hopper again, which will significantly reduce the dust removal efficiency. When the air leakage reaches 15% of the air volume processed by the dust collector, the dust removal efficiency is almost reduced to zero;
7. Gas temperature: The gas viscosity increases as the temperature rises, so that the centripetal force on the dust particles increases, and the separation efficiency decreases. Therefore, the dust collector efficiency of the cyclone dust collector decreases with the increase of the gas temperature or viscosity.
Introduction & advantages of ball mill
The ball mill is the key equipment for grinding materials after being crushed. This type of grinding machine is equipped with a certain number of steel balls as grinding media in its cylinder.
It is widely used in the production of cement, silicate products, new building materials, refractory materials, fertilizers, ferrous or non-ferrous metal beneficiation, and glass ceramics. The ball mill is suitable for grinding various ores and other materials. It is widely used in mineral processing, building materials and chemical industries. It can be divided into dry and wet grinding methods. According to different ways of discharging, it can be divided into grid type and overflow type.
The ball mill is mainly composed of a cylindrical barrel, an end cover, a bearing, a large transmission gear ring and other components. The barrel is filled with steel balls or steel bars with a diameter of 25-150mm, which is called a grinding medium, and its loading is the entire barrel. 25%-50% of effective volume. There are end caps at both ends of the cylinder. The end caps are connected with the flange at the end of the cylinder by bolts. There is a hole in the middle of the end cap, which is called a hollow shaft. The hollow shaft is supported on bearings and the cylinder can rotate. A large gear ring is also fixed on the cylinder. In the drive system, the electric motor drives the large gear ring and the cylinder through the coupling, reducer and pinion to rotate slowly. When the cylinder rotates, the grinding medium rises to a certain height with the cylinder wall, and then falls in a parabola or cascade down. Because there is a hollow shaft on the end cover, the material is fed into the cylinder from the hollow shaft on one side, and gradually spreads and moves to the other side. During the movement of the material, the rotating cylinder brings the steel ball to a certain height and falls to hit the material. While a part of the steel balls in the cylinder body in a cascading state have a grinding effect on the material, the entire movement process is also the grinding process of the material.
The advantages of the ball mill are:
1. Stable operation and reliable work;
2. The use of materials and processing techniques with excellent performance extends the service life of main components;
3. Use three-dimensional design and simulation to optimize the design to make the equipment more cost-effective;
4. A variety of equipment types to meet the needs of different production processes.