What are the development directions of supersonic jet mills?
At present, the development trend of powder granulation technology is toward the direction of large-scale equipment, compact structure, high-tech processing technology, diversified functions, high efficiency, and automation of control systems.
- Large-scale equipment
With the advancement of science and technology and the development of technology, the advantages of large-scale production equipment have become more and more obvious. At the same time, the application of CAD/CAM technology and precise stress analysis technology has promoted the development of mechanical structure design and processing and manufacturing technology. The large-scale granulation equipment provides a solid technical guarantee. At present, the powder granulation equipment is developing in the direction of large-scale, and the single-machine processing capacity of the super-large screw extruder can reach 25-30t/h. Taking the screw granulator as an example, the maximum screw diameter of the existing equipment is 240mm, and the single machine processing capacity exceeds 2t/h. A super-large screw granulator with a screw diameter of 380mm and a single machine processing capacity of more than 4t/h is under development; a rotary cold belt drop molding device, the width of the condensed steel belt under development is more than 1.5m, the equipment length exceeds 20m, and the single machine processing capacity More than 6t/h.
- Compact structure
Another development trend of jet milling equipment is compact structure. The structural design of the equipment is more reasonable, more compact, and more ergonomic, thereby reducing manufacturing costs, reducing floor space and improving labor efficiency. Take the screw granulator as an example, the direct connection of the motor replaces the traditional belt drive, making the equipment more compact and the transmission torque is greater; the variable pitch design is adopted, and the material conveying section, kneading and extrusion section are designed on one shaft , So that the conveying, kneading, and granulation can be completed at one time. These design concepts all represent the development direction of powder granulation equipment.
- High-tech processing technology
With the expansion of the application field of powder granulation equipment, traditional mechanical processing methods can no longer meet the needs of powder design technology. In the future, the processing technology of powder equipment will develop in the direction of high technology. For example, computer-aided design/manufacturing (CAD/CAM) technology is used to design and process the screw thread profile, special deep hole processing equipment is used to process the slender hole of the cold belt die distributor, and the five-axis CNC bed is used to realize the space twisting blade Profile processing, using plasma cutting machine, laser, EDM to process small aperture templates, using nano technology (nanometer coating) to process extrusion screws and rotating steel belts to solve material holding rods, product demoulding, etc.
- Diversified functions
The powder post-processing project is a system project that includes many unit operations in multiple disciplines and categories. It is required that the selection of powder granulation equipment should reduce the intermediate steps to save investment; at the same time, the market demand for products also requires production Manufacturers can provide products in various forms. This requires diversification of the functions of powder granulation equipment. Take the special extruder pelletizer for catalyst as an example. Based on the ordinary single-screw pelletizer, this machine has been specially designed and improved. It consists of two parts, extrusion and pelletizing, which can complete the extrusion and pelletizing in one machine. At the same time, by replacing the die template, granular products of different particle sizes and shapes can be obtained; the rotary belt molding device can realize hemispherical, flake, block, and stripe shapes by replacing parts such as distributors and overflow weirs. The production of products with different shapes, such as the shape, greatly facilitates users and truly realizes the diversification of functions.
- Efficiency and efficiency
With the improvement of people's awareness of energy saving, higher requirements are put forward for the efficiency of powder granulation equipment. This type of equipment is required not only to meet functional requirements, but also to be energy-saving, durable, and low in use, maintenance, and repair costs to reduce product costs. Take the crushing granulator as an example. If a traditional electromagnetic speed-regulating motor is used and an ordinary speed regulator is used to regulate the speed, the motor power needs to be 45kW. If the frequency conversion speed motor is used and the frequency converter is used to adjust the speed, it can save energy by more than 30% in actual use; the dual-axis differential continuous kneader, due to the specially designed high-efficiency kneading element, has an operating time compared with ordinary screw kneaders. Cut it in half and more than double the efficiency. The adoption of these technologies indicates that high efficiency has become one of the main goals pursued in the design of powder granulation equipment.
- Control system automation
With the advancement of science and technology and the development of automatic control technology, whether to adopt assembly line operation and automatic control has become an important indicator to measure the advancement of powder post-processing technology. The control system adopts automatic control, which can not only ensure the flow of the production process and reduce the labor intensity of the operators, but more importantly, it can ensure the accuracy and real-time feedback of the production process, improve product quality, and reduce equipment failure rate. Taking the rotary belt molding device as an example, if the computer DCS distributed control system is adopted, not only can the automatic operation of feeding, granulating, conveying, packaging and other processes be realized, but also through various temperature, pressure, flow, speed and other sensors, real-time Monitor system status. When the system status and process parameters change, timely feedback the changes, send out an alarm signal, and adjust the parameters according to the preset status to automatically adjust the system status to ensure the normal operation of the equipment. It is foreseeable that the automation of the control system will greatly improve the technical level of the powder granulator equipment and become the inevitable direction of the development of powder granulation equipment.
What are the application fields and characteristics of the air classifier?
Application field of air classifier (material):
1. Superhard functional materials: silicon carbide, boron carbide, white corundum, brown corundum, diamond, zirconia, cerium oxide, high temperature alumina, silicon nitride, boron nitride, tourmaline, garnet, etc.
2. New chemical and polymer materials: magnesium hydroxide, aluminum hydroxide, aluminum oxide, carbon black, white carbon black, catalyst, titanium dioxide, activated carbon, ammonium polyphosphate, polyethylene wax, polyethylene, polypropylene, polyvinyl chloride , PTFE, epoxy resin, benzene aldehyde resin, fen aldehyde resin, paraffin wax, silica gel, titanium dioxide, dyes, flame retardants, blowing agents, zinc borate, etc.
3. Non-metallic minerals: calcite, dolomite, kaolin, talc, barite, quartz, graphite, coal powder, gangue, calcium carbonate (heavy, light), mica, vermiculite, pyrophyllite, spinel, Attapulgite, wollastonite, brucite, bentonite, limestone, diatomite, rectorite, sepiolite, petroleum coke, perlite, etc.
4. Metals and oxides: phosphorus iron, tantalum powder, selenium powder, spherical aluminum powder, molybdenum powder, high chromium iron, vanadium titanium, iron, aluminum, copper, zinc, tin, cobalt, nickel, magnesium, iron oxide, Alumina, zinc oxide, tin oxide, cobalt oxide, tungsten carbide, metallic silicon, stainless steel powder, alloy powder, etc.
5. New materials for batteries and copying: lithium cobalt oxide, cobalt oxide, lithium manganese oxide, manganese dioxide, lithium nickel cobalt oxide, lithium nickel manganese oxide, lithium carbonate, lithium iron phosphate, ternary materials, natural graphite, artificial graphite, Pitch coke, calcined petroleum coke, lithium hydroxide, cobalt tetroxide, ferrous oxalate, iron phosphate, carbon powder, etc.
6. Other materials: ceramic materials, refractory materials, electronic materials, magnetic materials, rare earth materials, phosphors, copy material powders, etc.
The performance characteristics of the air classifier:
1. It is suitable for the fine classification of dry micron products. It can classify spherical, flake, and needle-shaped particles, and can also classify particles of different densities.
2. The particle size of the graded products can reach D97: 8～150 microns, the product particle size is steplessly adjustable, and the variety is extremely convenient to change.
3. The classification efficiency (extraction rate) is 60% to 90%, and the classification efficiency of materials with good fluidity is high, otherwise the efficiency is reduced.
4. The vertical grading turbine device is adopted, with low speed, wear resistance, and low system power configuration.
5. Multi-stage classifiers can be used in series to produce products with multiple particle sizes at the same time.
6. It can be used in series with ball mill, vibration mill, Raymond mill and other grinding equipment to form a closed loop.
7. The control system adopts program control, the running status is displayed in real time, and the operation is simple.
8. The system runs under negative pressure, and the dust emission does not exceed 40mg/m³, and the equipment noise is not higher than 75dB(A) through the use of silencer measures.
Features of jet milling equipment
Air jet crushing equipment is used for various materials that cannot be crushed at room temperature. It is widely used in various chemicals, petrochemicals, machinery, ships, automotive industries, electronics industries, clothing, coatings, printing, engineering plastics, rubber, thermoplastic materials, hot melt Ultra-fine crushing of type materials, nylon, polyester, polyethylene, polypropylene, textiles, clothing, Chinese and Western medicinal materials, food industry and other products. The inert gas shielded airflow crushing system is a dry crushing system for flammable, explosive, and easily oxidizing materials. It consists of a nitrogen source, a compressor, a silo, a crushing host, a cyclone separator, and a dust collector. The material to be crushed enters the crushing area from the silo in a closed state, and the crushed material enters the classification area with the ascending airflow. The fine particles meeting the particle size requirements enter the cyclone separator and the dust collector to collect with the airflow, and the coarse particles return to the crushing area to continue. Shattered. The filtered inert gas is returned to the compressor suction port for recycling, meeting the requirements of environmental protection, energy saving, and clean production.
The working principle of the airflow crushing equipment: compressed air is filtered and dried, and then injected into the crushing chamber at a high speed through the Laval nozzle. The animal material is repeatedly collided and rubbed at the intersection of the high-pressure airflow and crushed. The crushed coarse and fine mixture plays a role in the negative pressure fan After reaching the classification area, the coarse and fine materials are separated under the strong centrifugal force generated by the high-speed rotating classification turbine. The materials that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles drop to the crushing area and continue to be crushed.
Features of jet milling equipment:
1. It is suitable for dry pulverization of various materials with Mohs hardness below 9, especially suitable for the pulverization of materials with high hardness, high purity and high added value.
2. The breakthrough of particle acceleration technology has greatly improved the crushing efficiency, reduced energy consumption, good particle shape, narrow particle size distribution and no large particles.
3. During the crushing process, the airflow temperature is reduced due to the rapid expansion of the airflow, which is especially suitable for the crushing of heat sensitive, low melting point, sugar-containing and volatile materials.
4. The crushing of materials by collision with each other is different from mechanical crushing which relies on the impact crushing of blades or hammers, etc., so the equipment is free from wear and the product is of high purity.
5. It can be used in series with a multi-stage classifier to produce products with multiple granularities at one time.
6. The equipment is compact in structure, easy to disassemble and clean, and the inner wall is smooth and has no dead corners.
7. The whole system is sealed and crushed, no dust, low noise, and the production process is clean and environmentally friendly.
8. The control system adopts program control, which is easy to operate.
9. Variable combined structure, compact structure, multi-purpose machine.
How to self-check and repair if the jet mill fails
The jet mill has a wide range of applications and high fineness of the finished product. Typical materials include super hard diamonds, silicon carbide, metal powder, etc. Ordinary air is replaced with inert gas, such as nitrogen and carbon dioxide gas, so that the machine can be protected by inert gas, which is suitable for crushing and grading treatment of inflammable, explosive, oxidizable and other substances.
Too much, too little or aging lubricating oil in the bearings of jet mills is the main cause of bearing overheating and damage. Therefore, the lubricating oil is used according to the filling quantity. Generally, the lubricating oil uses 70% of the space, too much or too little. Conducive to bearing lubrication and heat transfer, extending the service life of the bearing. The matching bearing cap is tight with the shaft. Too tight or too loose matching between the bearing and the shaft will cause the bearing to overheat. However, by operating the shredder equipment in this way, the frictional noise and movement become more obvious, so the bearing should be disassembled, the friction part should be completed, and then reassembled as needed.
The pulverizer, cyclone separator, dust collector, and induced draft fan form a complete pulverization system. The dry compressed air is injected into the crushing chamber through a high-speed Laval nozzle. When the high-pressure air impacts the material, it repeatedly collides, rubs, shears, and crushes. The crushed material interacts with the upward air movement. The exhaust fan rotates at high speed, and the turbine is powerful. Under the action of the centrifugal force, the particles that meet the requirements enter the cyclone separator and dust collector through the classification wheel to collect, and the coarse particles return to the crushing zone to continue crushing.
The jet mill is a device that uses high-speed airflow to achieve ultra-fine grinding of dry materials. It consists of a pulverizing nozzle, grading and other components. The material enters the pulverizing chamber through a screw feeder, and the compressed air enters at a high speed through a special configuration of supersonic nozzles. In the crushing chamber, the material is repeatedly impacted, collided and crushed by the high-speed airflow.
Nowadays, jet mills are frequently used, and there are many types of popular mills on the market. Therefore, they have various problems. When encountering these problems, everyone always waits for maintenance personnel to inspect and repair, which is costly and troublesome. If we can perform self-examination and repair at this time, it will be much more convenient.
First, check the power socket, plug, and power cord for oxygen loss or breakage. If there is no such problem, you can plug in the power test machine. When the motor is energized and does not rotate, the wheel can be turned by lightly turning it by hand. It can be concluded that one of the two starting capacitors of the device has failed. If the discharge spark can be emitted and there is a loud "pop" sound, it means that the capacitor can be used; if the spark and noise are weak, it means that the capacity of the capacitor has decreased, and it needs to be replaced or added with a small capacitor. If the capacitor of the jet mill is damaged and short-circuited, this method cannot be used, and it must be replaced with a new product of the same specification to be repaired.
Regarding the safety issues when using the jet mill
The jet mill uses high-speed airflow to carry animal materials, so that the material particles collide and shear each other to achieve the purpose of ultra-fine pulverization. Because of its excellent pulverizing effect, it is favored by powder manufacturers in various industries. The typical materials of the jet mill are: super hard diamond, silicon carbide, metal powder, etc., high purity requirements: ceramic pigments, medicine, biochemical, etc., low temperature requirements: medicine, PVC. By changing the ordinary air in the air source to inert gases such as nitrogen and carbon dioxide, the machine can be used as an inert gas protection device, suitable for the crushing and classification of inflammable, explosive, and oxidizable materials.
The safety issues of ultrafine powder processing with jet mills include respiratory pneumoconiosis and dust explosion. The particle size of the dust processed by the jet mill is basically below 5μm, and the dust below 5μm is the most harmful to the human body. Therefore, the probability of the operator of the jet mill operator suffering from pneumoconiosis occupational disease will increase significantly.
In addition, after the dust is scattered in the air on a large scale to form a dust cloud, a dust explosion may occur. Because the dust particles that are not captured during the processing of the jet mill have a suitable particle size and distribution state: generally the particle size is less than 5μm, the dispersion stability in the air is good, and it is easy to reach the explosion limit. If there is enough combustion-supporting air around these particles and has its minimum ignition energy, then dust explosions are prone to occur. Moreover, the shock wave generated by the explosion of a local dust cloud causes a large amount of deposited dust to fly up and mix with the air, which may form a secondary explosion. Because dust explosion has the characteristics of large energy, serious damage, short burst time, etc., it is easy to cause incomplete combustion, thereby producing a large amount of carbon monoxide gas to poison people. Therefore, the consequences of dust explosions are extremely serious.
What points should be paid attention to in the daily maintenance of the jet mill?
1. During the production process, the bearing temperature rise of the jet mill must be checked frequently. When the temperature rise exceeds 50°C, the machine should be shut down for inspection to find out the cause and eliminate the fault.
2. When the jet mill is running, the transmission belt is easy to stretch, so attention should be paid to adjusting the belt's proper tightness to ensure the working life of the belt.
3. The wearing parts should be checked frequently and replaced in time to ensure production quality and throughput.
4. The blades and bushings should be frequently checked for wear. After wear, the productivity will decrease and the particle size will become coarser. Replace it in time when it is found to be worn.
5. The main engine and graded flow bearings are all grease lubricated.
6. The grease replacement period for the bearings of the jet mill is 2000 hours, and the filling amount of the grease is 1/2 (upper measurement) or 3/4 (lower measurement) of the space in the bearing cavity. Do not fill with grease too much. Otherwise, the bearing temperature will be too high.
7. The grease change period of the screw feeder is 4000 hours, and ordinary calcium-based grease is added.
In fact, every kind of mechanical equipment has a certain degree of danger when in use, and the fluidized bed jet mill is the same. This requires us to master its use method, standard operation and scientific maintenance can minimize the risk of danger.
The jet mill can ensure the collection rate and yield of ceramic pigments
Ceramic colors refer to powdered metal oxides and other mixtures used for ceramic glazes, which are used to decorate ceramics, porcelain and terracotta, and are also used in porcelain enamels for decorative metalware. When it is in powder form, most of the ceramic pigments are off-white; although the particle size requirements of the pigments are not explicitly specified, it is generally required to pass a 300-mesh sieve. Insufficient pulverization will make it difficult to use due to uneven particle size, and lack of hiding power, resulting in spots after firing. On the contrary, if the crush is too fine as dust, it will not be fully fused in the glaze and become the cause of glaze rolling. Compared with other crushing equipment, the product morphology, particle size distribution, purity and other aspects obtained by the jet mill have obvious advantages.
The ceramic pigment jet milling equipment strictly controls the distribution of particles to ensure a qualified collection rate and yield rate. The complete production line is our company's mature technology, with stable equipment performance, constant operating parameters and reliable quality.
Equipment characteristics of ceramic pigment jet mill
1. Avoid impurities doping into the materials to ensure the purity of the materials.
- Without water, washing, and completely dry production, one-time production can obtain fine powder materials with better particle size distribution and pollution-free, and the single-number finished product rate can reach more than 75%.
- Complete, stable and uniform flow field control technology; constant gas-solid concentration ratio design technology in the crushing cavity to ensure the stable and long-term operation of the system.
- Reasonable flow field design and special wear-resistant treatment for easy-wear parts greatly reduce the wear of the equipment, extend the service life, high classification accuracy, more accurate cutting particle size, lower speed required, and long service life.
2. In a fully fluidized state, an excellent spherical particle shape can be obtained; qualified micropowders are immediately classified to avoid excessive crushing. The company's unique frequency conversion feeding system helps to disperse materials, ensure continuous, uniform and stable feeding, and help product particle size control.
3. The complete and stable flow field established by the high-efficiency and high-precision classifier can strictly limit the generation of large particles, and obtain an excellent particle size distribution and a high and narrow particle size range. In particular, the core competitive advantage of more thorough extraction and good stability of fine powder has been widely recognized by the industry.
4. Once the operating parameters of the equipment are adjusted and fixed, the operation is stable, and there is no difference or change in the long-term continuous startup.
5. Fully enclosed negative pressure operation, low temperature crushing, high purity operation, no dust pollution, system emission <5mg/m3. The crushing chamber is equipped with an automatic slag discharge device, which can automatically remove the hard-to-grind particles and impurities in the material. It has the function of breaking up and dispersing agglomerated materials. Large flow of air means cooling and grinding, which can be used for processing heat-sensitive materials without deposition problems.
Ceramic pigment jet mill is suitable for typical materials: ceramic pigments (glaze, frit, etc.), ceramic raw materials (feldspar, porcelain clay, bauxite, etc.), ceramic raw materials (clay, gangue, etc.), special ceramics, diamonds , Green (black) silicon carbide, brown (white) corundum, cubic boron nitride, garnet, zircon sand, quartz sand, tungsten carbide, mullite, refractory materials, etc...
How to superfine lithium iron phosphate
Lithium iron phosphate battery is a new type of lithium ion battery that has attracted widespread attention in recent years. Because lithium iron phosphate ( LiFePO4 ) material has the characteristics of high specific energy, long cycle life, stable structure, good safety performance, and low cost, lithium iron phosphate Power batteries have many advantages such as high mass specific energy, low unit price, and high working potential. The pulverization of lithium iron phosphate is a very important link. The products processed by the principle of jet pulverization have narrow particle size distribution, no excessive pulverization and large particles, low fine powder rate, and high pass rate. They are the first choice of most battery material manufacturers. The lithium iron phosphate special jet mill has the characteristics of high yield, uniform particle size distribution, and good particle morphology. It can be widely used in micron-level experiments and production of battery powder cathode materials.
The special jet mill for lithium iron phosphate is a kind of equipment that uses high-speed airflow to achieve ultra-fine grinding of dry materials. It consists of a feeding zone, a crushing zone, and a classification zone. The material enters the crushing zone through the feeding zone, and the crushed material enters the classification zone with the upward air flow under the action of the negative pressure system. The fine particles that meet the particle size requirements enter the cyclone separator and the dust collector to collect with the air flow, but do not meet the particle size requirements The coarse particles return to the crushing zone to continue crushing.
The special jet mill for lithium iron phosphate also has the following performance advantages:
1. The jet mill has the ability of shaping, the finished particle has an excellent morphology, and can obtain spherical (potato-like) particles.
2. Narrow particle size distribution and high tap density of the finished product.
3. Mechanical ultra-fine pulverizer, low over pulverization, and the finished product rate can reach 75%-95% or more.
4. The inside of the equipment can be lined with wear-resistant materials, and the finished product has high purity and low equipment wear.
5. The air flow classifier adopts frequency conversion adjustment, which can be adjusted arbitrarily between 0.5μm and 100μm.
6. The equipment runs stably, and there is no difference or change when it is turned on continuously for a long time.
7. Fully enclosed negative pressure operation, automatic control, low noise and no dust pollution.
The structural characteristics of the special jet mill for lithium iron phosphate are:
1. The material contact cavity is lined with ceramic or coating to prevent iron pollution caused by the material crushing process and ensure the purity of the crushed items.
2. Does not heat up. The material is crushed under the state of gas expansion, and the temperature will not rise.
3. The wear is small, the particles collide and crush each other, and rarely collide with the wall surface. It is suitable for crushing materials with Mohs hardness below nine.
4. Low energy consumption, 15%~25% energy saving compared with other types of jet mills.
It adopts advanced automatic control, real-time display of running status, simple operation, and can form a central monitoring system with the equipment control system according to the actual requirements of customers to realize remote monitoring.
Maintenance of jet mill classifier
The jet mill adopts the advanced structure of similar products at home and abroad, and is updated and improved on the basis of the Raymond mill in the same industry. This equipment has higher efficiency than ball mills, lower power consumption, smaller footprint, and small one-time investment. The jet pulverization classifier is a kind of equipment that uses high-speed airflow to achieve ultrafine pulverization of dry materials. The jet pulverization classifier is composed of a pulverizing nozzle, a grading rotor, and a screw feeder. The jet pulverizing classifier, cyclone separator, dust collector, and induced draft fan constitute a complete pulverizing system.
After the compressed air is filtered and dried, it is sprayed into the crushing cavity at high speed through the nozzle. At the intersection of multiple high-pressure airflows, the materials are repeatedly collided, rubbed, and sheared to be crushed. The crushed materials move with the ascending airflow under the action of the fan's suction. In the classification area, the coarse and fine materials are separated under the strong centrifugal force generated by the high-speed rotating classification turbine. The fine particles that meet the particle size requirements are collected by the cyclone separator and dust collector through the classification wheel, and the coarse particles drop to the crushing area and continue to be crushed. The jet mill classifier is widely used in industries such as chemical industry, minerals, metallurgy, abrasives, ceramics, refractory materials, medicine, pesticides, food, health products, new materials and so on.
The jet pulverization classifier is an air flow classification technology with a square cylindrical structure as the main body. This technology changes the form of the circular cylinder rotating air field, which makes the material more dispersible, thereby improving the classification efficiency. The jet pulverizing classifier adopts a high-precision horizontal classification form, which has a sharp cutting effect, good cutting accuracy and large particle control performance. The jet pulverizing classifier also adopts the connection form of the classifying wheel hinge structure, which can remove the classifying impeller, making it very convenient for gap adjustment and maintenance. It embodies the humanized design concept.
Air jet pulverizer classifier needs maintenance after working for a period of time to extend its service life and create more benefits for manufacturers. The jet pulverizing classifier can be maintained through the following four aspects:
(1) When cleaning the jet mill classifier, the motor and bearing seals should not be wetted with water.
(2) When replacing parts or repairing and maintaining the jet mill classifier, it should be carried out in the power-off state, and warning signs should be hung up.
(3) The bearings should be lubricated.
(4) Lubricating oil must be added after the general jet pulverizing classifier has worked for 1500 hours.
Precautions & maintenance steps before assembling the grinder
The shredder should be cleaned before assembly to ensure that the surface is clean. Pay attention to the cleanness of the ring die. If the material of the ring die of the screw hole is not clear, the ring die bolt hole is likely to be broken when the bolt tightens the ring. It is hoped to use a torque wrench to tighten the ring die to ensure the specified tightening torque.
Generally speaking, the new mold that matches the new roller, the ring mold and the old mold use the old roller, and each partial gap between the rollers is roughly the same. Therefore, the entire ring mold loading and unloading uniform can improve production efficiency. When assembling the roller, pay attention to the inspection of the bearing. If damage is found, it should be replaced in time. After the roller is assembled, make sure that there is a certain gap so that the roller can rotate freely. The transfer roller must be oiled on time. Once the roller lacks oil, it will cause the bearing and pressure roller to burn, and in severe cases, the entire roller will be scrapped.
And pay attention to before work, check the transmission parts, meters, valves, filling lubricating oil, and remove iron. The maintenance of carbon steel ring molds is more cautious.
1. The fixed operation of the crusher should be fixed on the cement foundation. If you change the work place frequently, the shredder and the motor should be installed on the base made of angle iron. If the pulverizer is powered by a diesel engine, the power of the two should be matched, that is, the power of the diesel engine is slightly greater than that of the pulverizer, and the pulley grooves of the two should be consistent. The outer end surface of the pulley should be on the same plane.
2. Before starting up, check whether the connecting bolts of each part of the unit are tight, whether the tightness of the transmission belt is appropriate, and whether the power cord is in good condition. Whether the motor shaft and the shredder shaft are parallel.
3. Check whether the hammer is in good condition, the aperture of the sieve is suitable, and whether it is damaged. Drag the belt by hand to check whether the spindle rotates flexibly, whether it is stuck, bumped, or rubbed.
4. After starting the machine, let the equipment run idling for 2-3 minutes to check whether the rotation of the rotor is correct and whether the sound is normal. It can work only after it rotates smoothly at the rated speed.
5. Pay attention to the operation of the crusher at all times during work, and feed evenly to prevent blocking the car, and do not overwork for a long time. If there are vibrations, noises, excessive temperature of the bearing and the body, or spraying materials, you should stop and check immediately, and then continue to work after troubleshooting.
6. The crushed materials should be carefully inspected, and no foreign objects such as stones, metals, etc. should be mixed to avoid damage to the machine.
7. When the machine is running, the operator is not allowed to leave the unit, nor is it allowed to disassemble the machine during operation to observe the working conditions in the crushing chamber, and the maintenance tools must not be placed on the machine or packing.
8. Operators should not wear gloves. When blockage occurs, it is strictly forbidden to reach into the filler hopper. When feeding, stand on the side of the grinder to prevent rebound debris from hurting the face.
9. Don't stop the machine immediately after the work is over, it should be idling for 2-3 minutes to allow the material in the machine to be discharged completely. Cleaning and maintenance work should be carried out after shutdown.
10. Hammers are the main wearing parts. After wear, the whole set of hammers must be replaced at the same time whether the edges and corners are changed in the same direction or the corners are changed. When replacing new hammers, the whole set of hammers must be replaced at the same time. Trade new for old. The sieves are also vulnerable parts. If part of the sieves are damaged, they can be riveted. If they are severely damaged, new sieves need to be replaced.
11. After 300 hours of operation of the crusher, the bearings should be cleaned and the oil should be replaced. When parking for a long time, the belt should be removed.
The air classifier can accurately classify metal powder
The rapid development of 3D printing has been widely used in our real life. The production of metal powder is a very critical part, but it is often overlooked. For high-quality special metals with superior mechanical properties required in the industry, alloy metal powders are showing an increasing trend. Airflow classifier is a common equipment in metal powder processing, and it is also a more important equipment. Only qualified finished metal powders screened by the airflow classifier can be put into application.
The metal powder air classifier is a classifying system composed of a classifier, a dust collector, and an induced draft fan. Under the action of fan suction, the material moves at high speed from the lower end of the classifier to the classification area with the updraft. Under the action of the strong centrifugal force generated by the high-speed rotating classification vortex, the coarse and fine materials are separated, and the fine particles that meet the particle size requirements are classified. The gap between the wheel blades enters the cyclone separator or the dust collector to collect, the coarse particles entrained by the part of the fine particles hit the wall and the speed disappears, and they descend along the cylinder wall to the secondary air outlet. After the strong elutriation of the secondary air, the coarse and fine particles are separated. The particles rise to the classification zone for secondary classification, and the coarse particles fall to the discharge port for discharge.
Equipment performance characteristics of metal powder air classifier:
1. It does not need to be washed with water or water, and it is produced by completely dry method, which can obtain a narrower particle size distribution and non-polluting abrasive powder; one grade can be processed into products of any brand according to the current domestic and foreign standards (such as: national standard W63～W3.5, Japanese standard 240#～3000# and European standard F230/53～F1200/3). The single number finished product rate reaches more than 75%.
2. The classification accuracy is high, the cutting particle size is more accurate, the required speed is lower, and the service life is long.
3. Independent casting bearing seat, never deformed, and long service life.
4. Optimized transmission design, small bearing force and long service life.
5. Unique piping design helps powder flow, helps reduce abrasion, and easy-to-wear parts are easy to replace and handle.
6. The unique frequency conversion feeding system is helpful for the dispersion of materials, can ensure the continuous uniformity and stability of the feeding, and is helpful for the control of product particle size.
7. Unique internal circulation secondary air design, adjustable grading cone gap, greatly reduced air consumption, lower grading energy consumption, and thorough extraction of fine powder.
8. The separation of the flow path helps to slow down the abrasion at the bottom of the classification wheel and is more conducive to the control of large particles.
9. Fully enclosed negative pressure operation, no dust pollution.
10. Good stability, stable production after adjusting the fixed parameters once;
11. In particular, the core competitive advantage of more thorough extraction of fine powder and good stability has been widely recognized by the industry.
12. The whole system adopts automatic control, which can realize one-button start and stop, and the operation is simple and convenient. The connection with the central control can realize remote control.
- General application:
It can classify materials that cannot be classified on ordinary sorting equipment. It is especially suitable for processing products that strictly limit the largest particle size and require a narrow particle size distribution, such as heavy calcium, kaolin, talcum powder, barite powder, copier toner, paint, Mica, graphite, auxin, aluminum hydroxide, etc.
- High-purity applications:
It can classify materials with extremely strict impurity content or materials that are extremely sensitive to iron, while meeting the requirements of particle size and particle size distribution. Typical materials are: fluorescent powder, titanium dioxide, starch, silica gel, aluminum, copper, luminescent powder and various high-purity pigments.
- Abrasive and hard materials:
The application of the vertical eddy current classifier can exceed the subdivision level of hard materials with a Mohs hardness level of seven or more, so that the wear of the equipment is extremely small. The rotating speed of the grading wheel can be adjusted, and the crushing parameters can be optimized. The combination of multiple classifiers can complete narrow-band classification of several particle sizes at one time. Typical products are: diamond, silicon carbide, boron carbide, tungsten carbide, special ceramics, emery and so on.
- Food, health products, medicine:
It can superfinely process the raw materials of medicine, food and health care products. Its low-temperature pulverization, high-purity operation, high processing finish and easy cleaning of the machine are ideal for use in the pharmaceutical, health care and food industries, which not only improves the bioavailability of medicines. And curative effect, and reduce production cost. Typical products are: pollen, hawthorn, shiitake mushroom, pearl powder, stomach medicine, nimodipine, antibiotic medicine, contrast medicine, Ganoderma lucidum, gallnut, fleece-flower root, etc.