Matters needing attention in safe operation of jet mill
Jet mills are becoming more and more popular in the powder industry, ranging from chemicals and mining to new energy sources, polymer materials, metals, superhard materials, medicines and foods, etc. Including rare earths, magnetic materials, ceramic materials, refractory materials, and light-emitting reflective materials all have applications in jet milling.
The following points should be paid attention to in the safe operation of jet mill:
1. Before starting the jet mill, check whether the various parts of the equipment are complete, and make sure that the parts are not loose, and the equipment can be started after confirming that it is correct.
2. The electric box and the motor must be grounded.
3. When the equipment is started, it is forbidden to touch any rotating parts, and it is forbidden to put your hands on the discharge port to prevent accidents or personal injury.
4. It is forbidden to do equipment maintenance and maintenance work under the condition of electrification and air.
Boot sequence:
1. Turn on the cooling water and start the air compressor. After 2-3 minutes of no-load operation, it is in normal operation.
2. Start the freeze dryer (the cooling water is connected with the cooling water of the air compressor).
3. The air compressor and freeze dryer work normally. After the air pressure reaches 0.7Mpa-1Mpa, start the host, adjust to the required speed, and then start the fan.
4. Before opening the main air pipe valve of the jet mill, adjust the air seal pressure of the motor bearing from 0.03Mpa to 0.05Mpa. After checking the above contents, start feeding and crushing.
5. Adjust the pulse air pressure of the dust collector to about 0.4Mpa.
6. When adjusting the thickness or fineness of the material according to the needs, the speed of the main machine’s grading wheel can be adjusted: low coarse and high fine.
7. In the discharging process after crushing the material, tap the outer wall of the conveying pipe, cyclone and dust collector regularly with a leather hammer to avoid closing the contaminated material, causing the pipe to block and affecting the normal discharging.
Stop sequence (after stopping feeding):
1. Turn off the main air pipe valve. After the compressor is depressurized, turn off the air compressor power supply, turn off the freeze dryer, and then turn off the induced draft fan. When the rotation speed of the induced draft fan drops below half, turn off the inverter, turn off the dust collector, and turn off unloading. valve.
2. When the temperature of the air compressor is lower than about 60°C, turn off the cooling water.
3. Regarding pulse dust removal: When the jet mill is shut down after work every day, let the pulse meter work for 5-10 minutes to wash off the powder adsorbed on the filter bag and keep the air flow unblocked.