Plastic extruder is a kind of common plastic machinery and equipment. In the process of daily operation of extruder, it is inevitable that various failures will occur, which will affect the normal production of extruder. Below we will detail the failures of extruder Analysis.
The main motor cannot start
Cause:
(1) There is an error in the driving procedure. ਨੂੰ
(2) There is a problem with the main motor thread, and whether the fuse is burned out. ਨੂੰ
(3) The interlocking device related to the main motor works.
Treatment method:
(1) Check the procedures and restart the car in the correct driving sequence.
(2) Check the main motor circuit. ਨੂੰ
(3) Check whether the lubricating oil pump is started, and check 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.
(4) Check whether the emergency button is reset. ਨੂੰ
(5) The inverter’s induction current has not been discharged, turn off the main power supply and wait for 5 minutes before starting. ਨੂੰ
Host current is unstable
Cause:
(1) Uneven feeding. ਨੂੰ
(2) The main motor bearing is damaged or poorly lubricated. ਨੂੰ
(3) A certain section of the heater fails and does not heat. ਨੂੰ
(4) The screw adjustment pad is wrong, or the phase is wrong, and the components interfere. ਨੂੰ
Treatment method:
(1) Check the feeder and troubleshoot. ਨੂੰ
(2) Overhaul the main motor and replace the bearings if necessary. ਨੂੰ
(3) Check whether the heaters are working normally, and replace the heaters if necessary. ਨੂੰ
(4) Check the adjustment pad and pull out the screw to check if there is any interference in the screw.
The main starting current is too high
Cause:
(1) The heating time is insufficient and the torque is large. ਨੂੰ
(2) A certain section of heater does not work. ਨੂੰ
Treatment method:
When driving, use the hand wheel, if it is not easy, extend the heating time or check whether the heaters of each section are working normally.
The machine head is not smooth or blocked
Cause:
(1) A certain section of the heater does not work, and the material is poorly plasticized. ਨੂੰ
(2) The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable. ਨੂੰ
(3) There may be foreign objects that are not easy to melt. ਨੂੰ
Treatment method:
(1) Check the heater and replace if necessary. ਨੂੰ
(2) Verify the set temperature of each section, negotiate with the technician if necessary, and increase the temperature set value. ਨੂੰ
(3) Clean up and check the extrusion system and machine head. ਨੂੰ
The main motor makes an abnormal sound
Cause:
(1) The main motor bearing is damaged. ਨੂੰ
(2) A certain SCR in the SCR rectifier circuit of the main motor is damaged.
Treatment method:
(1) Replace the main motor bearing. ਨੂੰ
(2) Check the thyristor rectifier circuit, and replace the thyristor component if necessary.
The main motor bearing temperature rise is too high
Cause:
(1) Poor bearing lubrication.
(2) The bearing is seriously worn. ਨੂੰ
Treatment method:
Check and add lubricant. Check the motor bearings and replace if necessary. ਨੂੰ
Unsteady head pressure
Cause:
(1) The rotation speed of the main motor is uneven. ਨੂੰ
(2) The speed of the feeding motor is uneven and the feeding amount fluctuates.
Treatment method:
(1) Check the main motor control system and bearings.
(2) Check the feeding system motor and control system.
Low lubricating oil pressure
Cause:
(1) The pressure setting value of the pressure regulating valve of the lubricating oil system is too low. ਨੂੰ
(2) The oil pump is faulty or the oil suction pipe is blocked.
Treatment method:
(1) Check and adjust the pressure regulating valve of the lubricating oil system.
(2) Check the oil pump and oil suction pipe. ਨੂੰ
The automatic screen changer is slow or not working
Cause:
(1) Low air or oil pressure. ਨੂੰ
(2) Cylinder (or hydraulic station) leaks (or leaks oil)
Treatment method:
(1) Check the power system of the screen changer. ਨੂੰ
(2) Check the sealing condition of the cylinder or hydraulic cylinder. ਨੂੰ
The safety pin or safety key is cut off
Cause:
(1) Excessive torque of the extrusion system
(2) The main motor and the input bearing are not connected
Treatment method:
(1) Check whether there is metal and other substances in the extrusion system that jam the screw. At the beginning, check whether the warm-up time or the warm-up value meets the requirements.
(2) Adjust the main motor.
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