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Common faults of twin screw extrusion granulator

by:TENGDA     2022-10-02

1. The main electric starting current of the twin-screw extrusion granulator is too high
Cause: Insufficient heating time and large torque. A section of the heater is not working.
Treatment method: Use the hand crank when driving. If it is not easy, prolong the heating time or check whether the heaters of each section are working normally.


2. The temperature rise of the main motor bearing of the twin-screw extruder is too high
Cause: Poor bearing lubrication. Bearings are severely worn.
Treatment method: Check and add lubricant. Check motor bearings and replace if necessary.


3. The main motor of the twin-screw extruder makes an abnormal sound
Cause: The main motor bearing is damaged. A certain thyristor in the thyristor rectifier circuit of the main motor is damaged.
Treatment method: replace the main motor bearing. Check the thyristor rectifier circuit, and replace the thyristor element if necessary.


4. The head of the twin-screw extruder is not smooth or blocked
Cause: A certain section of the heater does not work, and the material is poorly plasticized. The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable. There may be foreign matter that does not melt easily.
Treatment method: Check the heater and replace if necessary. Verify the set temperature of each section, and negotiate with the technician if necessary to increase the temperature set value. Clean and check the extrusion system and the machine head.


5. The current of the twin-screw extruder is unstable
Causes: uneven feeding, damage to the main motor bearing or poor lubrication, failure of a certain section of the heater, no heating, wrong screw adjustment pad, or wrong phase, and component interference.
Treatment method: Check the feeder and troubleshoot. Overhaul the main motor and replace the bearings if necessary. Check whether each heater is working properly, and replace the heater if necessary. Check the adjustment pad and pull out the screw to check whether the screw interferes.


6. The main motor of the twin-screw extruder cannot be started
Cause: There is an error in the driving program. There is a problem with the main motor thread, whether the fuse is burned.
Solution: Check the program and restart the car in the correct driving sequence. Check main motor circuit. Check whether the lubricating oil pump is activated, and check the status of the interlocks related to the main motor. If the induction power of the inverter has not been discharged, turn off the main power supply and wait for 5 minutes before restarting. Check that the emergency button is reset.


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