Plastic Extruder Failure Analysis

The plastic extruder is a common plastic machinery and equipment. During the daily operation of the extruder, various faults may occur in the extruder, which affects the normal production of the plastic machinery. Below we will analyze the faults of the extruder.
Host current is unstable
1. Production reasons:
⑴Uneven feeding.
⑵The main motor bearing is damaged or poorly lubricated.
⑶The heater in a certain section fails and does not heat.
⑷The screw adjustment pad is wrong, or the phase is wrong, and the components interfere.
2. Processing method:
⑴ Check the feeder and troubleshoot.
⑵Inspect the main motor and replace the bearings if necessary.
⑶ Check whether each heater is working properly and replace the heater if necessary.
⑷ Check the adjustment pad, pull out the screw and check whether there is any interference with the screw.
Main motor cannot start
1. Cause:
⑴The driving procedure is wrong.
⑵There is a problem with the main motor thread, and whether the fuse wire is burned.
⑶The interlocking device related to the main motor works
2. Processing method:
⑴ Check the procedures and drive again according to the correct driving sequence.
⑵ Check the main motor circuit.
⑶ Check whether the lubricating oil pump is started and check the status of the interlocking device related to the main motor. The oil pump does not turn on and the motor cannot turn on.
⑷ If the induction power of the inverter is not discharged completely, turn off the main power supply and wait for 5 minutes before starting it again.
⑸ Check whether the emergency button is reset.
The machine head is not discharging smoothly or is blocked.
1. Cause:
⑴ A certain section of the heater does not work, and the material is poorly plasticized.
⑵The operating temperature is set too low, or the molecular weight distribution of the plastic is broad and unstable.
⑶ There may be foreign matter that is not easy to melt.
2. Processing method:
⑴ Check the heater and replace it if necessary.
⑵ Verify the set temperature of each section, and negotiate with the technician if necessary to increase the temperature set value.
⑶Clean and inspect the extrusion system and machine head.
Main power starting current is too high
1. Cause:
⑴Insufficient heating time and high torque.
⑵A certain section of heater does not work.
2. Processing method:
⑴Turn the car by hand when driving. If it is not easy, extend the heating time or check whether the heaters in each section are working properly.
The main motor makes an abnormal sound
1. Cause:
⑴The main motor bearing is damaged.
⑵A certain thyristor in the main motor thyristor rectifier circuit is damaged.
2. Processing method:
⑴Replace the main motor bearings.
⑵ Check the silicon controlled rectifier circuit and replace the silicon controlled components if necessary.