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The cause of the failure of the twin-screw extruder

by:TENGDA     2022-10-07
The main motor of the twin-screw extruder cannot be started. Reason: The driving procedure is wrong. There is a problem with the main motor thread, whether the fuse is burned.
Treatment method: 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.
The main causes of the current instability of the twin-screw extruder are: 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.
The reason for the poor discharge or blockage of the twin-screw extruder head: 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.
The main motor of the twin-screw extruder makes an abnormal sound Cause: The bearing of the main motor 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.
The reason for the high temperature rise of the bearing of the main motor of the twin-screw extruder: Poor lubrication of the bearing. Bearings are severely worn.
Treatment method: Check and add lubricant. Check motor bearings and replace if necessary.

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