Low temperature grinding refers to the process of crushing the material cooled to the embrittlement point temperature into smaller particles or powders under the action of external forces. The low temperature grinding technology can ensure that the material to be crushed, such as natural products, is not destroyed in the grinding process. Low temperature crusher is a machine that is processed by low temperature (minimum temperature -70℃) to crush materials.
Working principle
Low temperature crusher system with liquid nitrogen as the cold source, the crushed material through cooling at low temperature to achieve embrittle easy to crush state, into the mechanical crusher chamber through high-speed rotation of the impeller, material and blade, tooth disk, material and material between the repeated impact, collision, shear, friction and other comprehensive action, to achieve the crushing effect: The crushed material is classified and collected by the airflow screen classifier: the material that does not meet the fineness requirements is returned to the silo for further crushing, and most of the cold air is returned to the silo for recycling.
Apply
Low temperature crusher system is used in a variety of materials that can not be crushed at room temperature, widely used in a variety of chemical, petrochemical, machinery, shipbuilding, automotive industry, electronics industry, clothing, paint, printing, engineering plastics, rubber, thermoplastic materials, hot melt adhesive, nylon, polyester, polypropylene, polyethylene, food industry (chili powder), Chinese and Western herbs, nylon, nylon, plastic, plastic, plastic, plastic, plastic, plastic, plastic, plastic, plastic, plastic, etc. Polyester, hot melt adhesive, all kinds of engineering plastics, polyethylene, polyvinyl alcohol, polystyrene (PS), thermoplastic elastomer, TPU, general plastics, High density polyethylene (HDPE), polypropylene, thermal adhesive, PA1010, Low density polyethylene (LDPE), clothing hot melt adhesive, decorative powder coating, Nylon 66, Pharmaceutical, nylon 11, vinyl acetate copolymer (EVA), nylon 6, nylon 12, plastic, rubber, PPT, PET, TPU, ABS, functional anticorrosive powder coating, linear low density polyethylene (LLDPE), etc. Engineering plastics: general engineering plastics (PA, PA6, PA66, PA11, PA12, PC, POM, PBT, PET, PPO, PMMA), etc. Special engineering plastics (PPS, PI, PSF, PEEK, PCTFE, LCP, PTFE, PES, PAI, PAR), etc.; Modified plastics: general plastic engineering modified products (modified ABS, PP, PVC, PC); Modified engineering plastics (PPO, PA, POM, PC, PBT (PET), PSU); Modified special engineering plastics (PPS, PEEK, PEI, PSF, LCP); Plastic rubber raw materials, various masterbatches and color masterbatches: such as white masterbatches, other color masterbatches, etc.; Ultrafine crushing of functional masterbatch, color pumping masterbatch, pigment dyes, thermoplastic elastomers, engineering plastics and other products. The technology can be widely used in chili powder, pepper powder, black pepper powder, white pepper powder, green pepper powder, cinnamon powder, cumin powder, grass carp powder, Dahongpajiao powder, cinnamon powder, red koji powder, red koji powder, cardamom powder, red pepper powder, garlic powder, star anise powder, clove powder, amomum powder, fragrant leaf powder, cardamom powder, grass fruit powder, yellow ginger powder, good ginger powder, five spice powder, fresh ginger powder, curry powder Sand ginger powder, chives powder, onion powder, mustard powder, meat powder, angelica powder, Shanai powder, green onion powder, cumin powder, spice powder, five spice powder, aniseed powder and other food industry materials crushing.
sort
(1) tooth mill: By the fixed gear ring and rotating gear disk high-speed relative operation, the material is crushed (including impact, shear, collision, friction, etc.) machine.
(2) hammer mill: By the high-speed rotating movable hammer parts and the relative movement of the fixed ring, the material is crushed (including hammering, collision, friction, etc.) machine. The hammer mill is divided into the hammer mill (paddle mill) with the active hammer hammer for the flake piece and the hammer mill (block mill) with the active hammer hammer for the block piece.
(3) knife mill: By the high-speed rotating knife plate (block, piece) and the relative motion of the fixed tooth ring to crush the material (including shear, collision, friction, etc.) machine.
Selection guide
First, choose according to the crushing raw materials
To crush grain feed based, can choose the top feed hammer mill; To crush bran and wheat feed, can choose the claw grinder; If it is required to have good versatility, such as crushing grain mainly, taking into account cake grain and straw, you can choose the tangential feed hammer mill; Grinding shells and other mineral feed, can choose shell non-screen crusher; If it is used as a pre-treatment of premixed feed, requiring the particle size of the product to be crushed is very fine and can be adjusted according to needs, special non-sieve crusher should be selected.
Select according to production capacity
The manual and nameplate of the general straw crusher contain its rated production capacity (kg/h). However, it should be noted that: first, the rated production capacity refers to the output in a specific state, such as grain feed crusher, which refers to the crushing raw material for corn, its water content is stored safe water (about 13%), and the diameter of the screen hole is 1.2 mm. Because it is the smallest commonly used sieve, the production capacity is small, so it should be considered when choosing. Second, the production capacity of the selected straw crusher should be slightly greater than the actual need for production capacity, otherwise the hammer wear, air leakage and other causes the production capacity of the straw crusher to decline, will affect the continuous production of feed supply.
According to the supporting power selection straw crushing machine manual and nameplate are contained in the mill supporting motor power kilowatts.
It often indicates not a fixed number, but a certain range. There are two reasons: First, there is a large difference in the power required when the raw material is crushed. For example, under the same working conditions, the power of crushing sorghum is twice as large as that of crushing corn. Second, when changing to different screens, the load of the crusher has a great impact.
maintenance
1, diesel engine cooling system maintenance check the working state of the thermostat, to prevent the diesel engine water temperature is too low or too high. Remove water from jacket
Filthy. It is necessary to choose a minimum temperature of about 10 ° C lower than that of the area where construction machinery is used, and it has winter anti-freeze, summer anti-boiling, anti-corrosion and waterproof
Long-acting antifreeze for dirt. Once the tank is found to have mud and sand deposition, remove it immediately.
2, electrical equipment maintenance check the battery motor wiring. Check and adjust the electrolyte density. Maintain the starting motor, adjust the power generation
Machine charging voltage. In winter, the battery should be charged frequently and the preheating device should be maintained.
3. The maintenance of the brake system should pay attention to whether the brake fluid is sufficient and whether the quality is deteriorating. Check the oil-water separator, discharge switch is working
Make normal. Check whether the brake is weak, running off, the brake pedal pedal is insufficient and the brake does not return, and adjust it in time.
Matters needing attention
1, diesel engine cooling system maintenance check the working state of the thermostat, to prevent the diesel engine water temperature is too low or too high. Remove water from jacket
Filthy. It is necessary to choose a minimum temperature of about 10 ° C lower than that of the area where construction machinery is used, and it has winter anti-freeze, summer anti-boiling, anti-corrosion and waterproof
Long-acting antifreeze for dirt. Once the tank is found to have mud and sand deposition, remove it immediately.
2, electrical equipment maintenance check the battery motor wiring. Check and adjust the electrolyte density. Maintain the starting motor, adjust the power generation
Machine charging voltage. In winter, the battery should be charged frequently and the preheating device should be maintained.
3. The maintenance of the brake system should pay attention to whether the brake fluid is sufficient and whether the quality is deteriorating. Check the oil-water separator, discharge switch is working
Make normal. Check whether the brake is weak, running off, the brake pedal pedal is insufficient and the brake does not return, and adjust it in time.
troubleshooting
Pulverizer in practical applications because of the use of ultra-high-speed DC motor so the heat is also high, the main heating part in the carbon brush and commutator and tank, this motor in the energized operation of the carbon brush contact on the commutator surface, the motor external power supply (generally DC excitation current), through the slip ring (on the rotor, with the rotor running), Provides to the rotor winding (field winding)., the role of current reversal, so that when the rotor rotates, the inflow of direct current from one end of the rotor to keep flowing, so that the motor rotates in one direction. The carbon brush is in good contact with the rotor of the motor, and the carbon brush is connected with the power supply to provide electrical energy for the rotor. Because the carbon brush is in contact with the commutator for a long time, it produces wear, when the length of the carbon brush reaches the point where it needs to be replaced, the supporting spring behind the carbon brush will no longer work, which may cause poor contact between the carbon brush and the commutator, and the situation that the mill is powered on does not start, when these problems are encountered, as long as the new carbon brush is replaced, the rotor head can be cleaned with alcohol.
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