ความผิดพลาดทั่วไปของเครื่องอัดรีดพลาสติก

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. ถึง

(2) There is a problem with the main motor thread, and whether the fuse is burned out. ถึง

(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. ถึง

(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. ถึง

(5) The inverter’s induction current has not been discharged, turn off the main power supply and wait for 5 minutes before starting. ถึง

Host current is unstable

Cause:

(1) Uneven feeding. ถึง

(2) The main motor bearing is damaged or poorly lubricated. ถึง

(3) A certain section of the heater fails and does not heat. ถึง

(4) The screw adjustment pad is wrong, or the phase is wrong, and the components interfere. ถึง

Treatment method:

(1) Check the feeder and troubleshoot. ถึง

(2) Overhaul the main motor and replace the bearings if necessary. ถึง

(3) Check whether the heaters are working normally, and replace the heaters if necessary. ถึง

(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. ถึง

(2) A certain section of heater does not work. ถึง

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. ถึง

(2) The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable. ถึง

(3) There may be foreign objects that are not easy to melt. ถึง

Treatment method:

(1) Check the heater and replace if necessary. ถึง

(2) Verify the set temperature of each section, negotiate with the technician if necessary, and increase the temperature set value. ถึง

(3) Clean up and check the extrusion system and machine head. ถึง

The main motor makes an abnormal sound

Cause:

(1) The main motor bearing is damaged. ถึง

(2) A certain SCR in the SCR rectifier circuit of the main motor is damaged.

Treatment method:

(1) Replace the main motor bearing. ถึง

(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. ถึง

Treatment method:

Check and add lubricant. Check the motor bearings and replace if necessary. ถึง

Unsteady head pressure

Cause:

(1) The rotation speed of the main motor is uneven. ถึง

(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. ถึง

(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. ถึง

The automatic screen changer is slow or not working

Cause:

(1) Low air or oil pressure. ถึง

(2) Cylinder (or hydraulic station) leaks (or leaks oil)

Treatment method:

(1) Check the power system of the screen changer. ถึง

(2) Check the sealing condition of the cylinder or hydraulic cylinder. ถึง

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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