Release time:

2024-07-20

In the process of long-term use of plastic extruder, it is inevitable that there will be various failures, which will affect the normal production and processing. Below, we will analyze some common faults of plastic extruders and give solutions to them, hoping to help you. The current of the main extruder is unstable 1. Causes: (1) Uneven feeding. (2) The main motor bearing is damaged or poorly lubricated. (3) A certain section of heater fails and is not heated. (4) The screw adjustment pad is wrong, or the phase is wrong, and the component interferes. 2. Treatment method: (1) Check the feeder and troubleshoot. (2) Overhaul the main motor and replace the bearing if necessary. (3) Check whether the heaters are working normally, and replace the heaters if necessary. (4) Check the adjustment pad, pull out the screw to check whether the screw interferes. The main motor cannot be started 1. Causes: (1) There is an error in the driving procedure. (2) There is a problem with the thread of the main motor, whether the fuse wire is burned. (3) The interlocking device related to the main motor works 2. Solution: (1) Check the procedure and start again in the correct driving order. (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 won't turn on, and the motor won't turn on. (4) Check whether the panic button is reset. (5) If the inverter induction power is not exhausted, turn off the total power supply and wait for 5 minutes before starting. The head discharge is not smooth or blocked 1. Causes: (1) A certain section of the heater does not work, and the material is not plasticized. (2) The operating temperature setting is low, or the molecular weight distribution of the plastic is wide and unstable. (3) There may be foreign matter that does not melt easily. 2. Treatment method: (1) Check the heater and replace it if necessary. (2) Verify the set temperature of each section, and negotiate with the technician if necessary to increase the temperature set value. (3) Clean and inspect the extrusion system and machine head. The main electric starting current is too high 1. Causes: (1) Insufficient heating time and large torque. (2) A certain section of heater does not work. 2. Treatment method: (1) When driving, the hand disc car should be used, if it is not easy, extend the heating time or check whether the heater of each section is working normally. The main motor makes an abnormal sound 1. Causes: (1) The bearing of the main motor is damaged. (2) A thyristor in the thyristor rectifier line of the main motor is damaged. 2. Solution: (1) Replace the main motor bearing. (2) Check the thyristor rectifier circuit and replace the thyristor components if necessary. The temperature rise of the main motor bearing is too high 1. Causes: (1) Poor bearing lubrication. (2) The bearing is seriously worn. 2. Causes: (1) Check and add lubricant. (2) Check the motor bearing and replace it if necessary. The pressure of the head of the plastic extruder is unstable 1. Causes: (1) The speed of the main motor is uneven. (2) The speed of the feeding motor is uneven, and the feeding amount fluctuates. 2. Solution: (1) Check the main motor control system and bearing. (2) Inspect the feeding system motor and control system. The lubricating oil pressure of the extruder is on the low side 1. Causes: (1) The pressure setting value of the pressure regulator of the lubricating oil system is too low. (2) The oil pump is faulty or the suction pipe is blocked. 2. Treatment method: (1) Check and adjust the pressure regulating valve of the lubricating oil system. (2) Check the oil pump and suction pipe.