1、 Operation steps
1. Equipment preparation and inspection
Check the transmission system, fasteners, and lubrication status, confirm that there are no leaks in the vacuum pump and pipelines, and that the inlet/outlet seals are intact;
Turn on the cooling water system, verify the sensitivity of the pressure gauge and vacuum gauge, and check whether the instruments, buttons, and grounding wires in the electrical control cabinet are normal;
Start the motor with no load and check for abnormal operating noise. The sound source needs to be investigated.
2. Loading operation
Powdered/slurry materials are loaded through vacuum feeding, with a loading capacity not exceeding 50% of the container volume, to avoid containing hard lumps;
After loading, close the feeding hole cover, wrap the filter cloth filter and tie it tightly to ensure sealing.
3. Vacuum pumping and start-up
Close the vent valve and start the vacuum pump to achieve a vacuum degree of -0.1 MPa (approximately 600-755 mmHg) inside the tank;
Start the motor and slowly adjust the speed. After the tank rotates at low speed, gradually increase it to the required speed for the process.
4. Heating and drying control
Open the heat transfer valve (steam or hot water), set the temperature to 20-160 ℃, and gradually increase the temperature to prevent material clumping;
Continuously monitor the vacuum degree and jacket temperature to maintain stable negative pressure and uniform heating of materials.
5. Stop and cool down
After drying, close the heat source valve and introduce cooling water into the jacket to cool it down to room temperature;
Stop the vacuum pump and open the vent valve to restore normal pressure. Cut off the power and stop the rotation of the tank body.
6. Unloading and Cleaning
Open the discharge hole cover to unload, clean up residual materials, and close the cover to prevent dust from entering;
Regularly clean the filter and residual materials in the tank, and maintain the sealing components.
2、 Key precautions
1. Material loading control: The volume of the material should not exceed 50% of the tank, and the loading of high-density or high moisture materials should be reduced;
2. Temperature regulation: In the initial stage, step heating is used, and high-temperature materials need to be cooled with cooling water before unloading;
3. Sealing verification: Before each operation, check the sealing performance of the vacuum pipeline, packing box, and manhole cover;
4. Exception handling: If there are abnormal fluctuations in vacuum or temperature during operation, the machine should be stopped immediately for maintenance;
5. Maintenance standards: Regularly lubricate bearings, replace filter cloth, clean jacket scale to extend equipment life.