Plastic extruder is a common plastic machinery equipment. During the daily operation of the extruder, various faults may occur, affecting the normal production of plastic machinery. Below, we will analyze the faults of the extruder.
The host current is unstable
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Production reasons:
⑴ Uneven feeding.
⑵ The main motor bearings are damaged or poorly lubricated.
⑶ A certain section of the heater is malfunctioning and not heating up.
⑷ The screw adjustment pad is incorrect, or the phase is incorrect, and the components interfere.
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Handling method:
⑴ Check the feeder and troubleshoot.
⑵ Repair the main motor and replace the bearings if necessary.
⑶ Check if each heater is working properly and replace it if necessary.
⑷ Check the adjustment pad and pull out the screw to check for any interference.
The main motor cannot start
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Reason for occurrence:
⑴ There is an error in the driving procedure.
⑵ There is a problem with the main motor thread, whether the fuse has been burned.
⑶ The interlocking device related to the main motor functions
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Handling method:
⑴ Check the program and restart the vehicle in the correct driving sequence.
⑵ Check the main motor circuit.
⑶ Check whether the lubricating oil pump is started and the status of the interlocking device related to the main motor. The oil pump cannot be turned on, and the motor cannot be turned on.
⑷ If the induction power of the frequency converter is not fully discharged, turn off the main power and wait for 5 minutes before restarting.
(5) Check if the emergency button has been reset.
The discharge of the machine head is not smooth or blocked
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Reason for occurrence:
⑴ A certain section of the heater is not working, resulting in poor plasticization of the material.
⑵ The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.
⑶ There may be foreign objects that are not easily melted.
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Handling method:
⑴ Check the heater and replace it if necessary.
⑵ Verify the temperature settings for each section and consult with the process engineer if necessary to increase the temperature settings.
⑶ Clean and inspect the extrusion system and machine head.
The starting current of the main power is too high
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Reason for occurrence:
⑴ Insufficient heating time and high torque.
⑵ A certain section of the heater is not working.
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Handling method:
⑴ When driving, use a hand cranked car. If it is not easy, extend the heating time or check whether each section of the heater is working properly.
The main motor emits an abnormal sound
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Reason for occurrence:
⑴ The main motor bearing is damaged.
⑵ One of the thyristors in the rectifier circuit of the main motor is damaged.
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Handling method:
⑴ Replace the main motor bearings.
⑵ Check the thyristor rectifier circuit and replace the thyristor components if necessary.
Zhangjiagang Carry Technology Co., Ltd. provides stable performance, high-quality and cost-effective plastic twin-screw/single-screw extruders and related PVC HDPE PP products extrusion production lines for customers to choose from, welcome to consult.