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Easily know the common faults of the extruder

Update:25-01-2021
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Easily know the common faults of the extruder-Early pre […]

Easily know the common faults of the extruder-Early prevention, early preparedness
1. The temperature rise of the main motor bearing is too high:
  1. Reason:
   (1) Poor bearing lubrication.
   (2) The bearing is worn out seriously.
  2. Reason:
  (1) Check and add lubricant. Check the motor bearings and replace if necessary.

 2. The head pressure is unstable:
  1. Reason:
   (1) The rotation speed of the main motor is uneven.
  (2) The speed of the feeding motor is uneven and the feeding amount fluctuates.
  2, processing method:
   (1) Check the main motor control system and bearings.
   (2) Check the feeding system motor and control system.


3. Low lubricating oil pressure:
  1. Reason:
   (1) The pressure setting value of the pressure regulating valve of the lubricating oil system is too low.
  (2) The oil pump is malfunctioning or the suction pipe is blocked.
  2, processing method:
  (1) Check and adjust the pressure regulating valve of the lubricating oil system.
   (2) Check the oil pump and suction pipe.
4. The automatic screen changer is slow or not working
  1. Reason:
   (1) Low air or oil pressure.
  (2) The cylinder (or hydraulic station) leaks air (or oil).
  2, processing method:
  (1) Check the power system of the screen changer.
  (2) Check the sealing condition of the cylinder or hydraulic cylinder.
5. The safety pin or safety key is cut off
  1. Reason:
  (1) Extrusion system torque is too large
  (2) The main motor and the input bearing are not connected
  2, processing method:
   (1) Check the extrusion system if there is metal or other objects entering and jamming the screw. At the beginning, check whether the warm-up time or the warm-up value meets the       requirements.
  (2) Adjust the main motor
6. Sudden decrease in extrusion volume:
  1. Reason:
  (1) The feeding system fails or there is no material in the hopper.
  (2) The extrusion system enters into the hard and jammed screw, preventing the material from passing through.
  2, processing method:
  (1) Check the material level of the feeding system or hopper.
  (2) Check and clean the extrusion system.
7. the host current is unstable
  1. Reasons for production:
   (1) Uneven feeding.
   (2) The main motor bearing is damaged or poorly lubricated.
   (3) A certain section of the heater fails and does not heat.
  (4) The screw adjustment pad is wrong, or the phase is wrong, and the components interfere.
  2, processing method:
   (1) Check the feeder and troubleshoot.
   (2) Overhaul the main motor and replace the bearings if necessary.
   (3) Check whether the heaters are working normally, and replace the heaters if necessary.
  (4) Check the adjustment pad and pull out the screw to check if there is any interference in the screw.

8. The main motor cannot start
  1. Reason:
(1) There is an error in the driving procedure.
  (2) There is a problem with the main motor thread, whether the fuse is burned.
  (3) The interlocking device related to the main motor works
  2, processing method:
   (1) Check the procedure and drive again in the correct driving sequence.
   (2) Check the main motor circuit.
   (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) The inverter has not discharged the induction current, turn off the main power supply and wait for 5 minutes before starting.
  (5) Check whether the emergency button is reset.
9. the machine head is not smooth or blocked
  1. Reason:
  (1) A certain section of the heater does not work, and the material is not plasticized.
  (2) The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.
  (3) There may be foreign objects that are not easy to melt.
  2, processing method:
   (1) Check the heater and replace if necessary.
   (2) Verify the set temperature of each section, negotiate with the technician if necessary, and increase the temperature set value.
  (3) Clean and check the extrusion system and the head.
10. The main starting current is too high
  1. Reason:
  (1) The heating time is insufficient and the torque is large.
   (2) A certain section of the heater does not work.
  2, processing method:
   (1) When driving, use a hand wheel, if it is not easy, extend the heating time or check whether each section of the heater is working properly.
11. The main motor makes an abnormal sound:
  1. Reason:
   (1) The main motor bearing is damaged.
   (2) A certain SCR in the SCR rectifier circuit of the main motor is damaged.
  2, processing method:
   (1) Replace the main motor bearing.
         (2) Check the SCR rectifier circuit, and replace the SCR components if necessary.

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