Twin screw extruder problem, this can help you solve 80%

Twin screw extruder problem solution

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Everyone who does production knows that the machine is the lifeblood of the machine. The editor who has done equipment knows that once the machine fails, it will affect the production efficiency, ranging from a short shutdown to find the cause of the failure, or to stop the line, which will affect the production capacity of the day. None of the departments hoped that the machine would fail, so today we simply sorted out 11 reasons for the failure of the twin screw extruder and its analysis. If it can give you a little help, the editor will be satisfied.

The main motor cannot be started

Reason 1: The driving procedure is wrong.
Treatment method: Check the program and restart the car in the correct driving sequence.
Reason 2: There is a problem with the main motor thread, whether the fuse is burned.
Solution: Check the main motor circuit. Check whether the lubricating oil pump is activated, and check the status of the interlocks related to the main motor. If the induction power of the inverter has not been discharged, turn off the main power supply and wait for 5 minutes before restarting. Check that the emergency button is reset.

The main motor makes an abnormal sound

Reason 1: The main motor bearing is damaged.
Treatment method: replace the main motor bearing.
Reason 2: A thyristor in the thyristor rectifier circuit of the main motor is damaged.
Treatment method: Check the thyristor rectifier circuit, and replace the thyristor element if necessary.

The host current is unstable

Reason 1: Uneven feeding.
Treatment method: Check the feeder and troubleshoot.
Reason 2: The main motor bearing is damaged or poorly lubricated.
Treatment method: overhaul the main motor, and replace the bearing if necessary.
Reason 3: A certain section of the heater fails and does not heat.
Treatment method: Check whether each heater is working normally, and replace the heater if necessary.
Reason 4: The screw adjustment pad is wrong, or the phase is wrong, and the components interfere.
Treatment method: Check the adjustment pad, pull out the screw to check whether the screw has interference.

The pressure of the machine head is unstable

Reason 1: The main motor rotates unevenly.
Treatment method: Check the main motor control system and bearings.
Reason 2: The rotation speed of the feeding motor is uneven, and the feeding amount fluctuates.
Treatment method: Check the feeding system motor and control system.

The temperature rise of the main motor bearing is too high

Cause: Poor bearing lubrication. Bearings are severely worn.
Treatment method: Check and add lubricant. Check motor bearings and replace if necessary.

The machine head is not discharged smoothly or blocked

Reason 1: A certain section of the heater does not work, and the material is poorly plasticized.
Treatment method: Check the heater and replace if necessary.
Reason 2: The operating temperature is set too low, or the molecular weight distribution of the plastic is wide and unstable.
Treatment method: Verify the set temperature of each section, and negotiate with the craftsman if necessary to increase the temperature set value.
Reason 3: There may be foreign objects that are not easily melted.
Treatment method: clean and check the extrusion system and the machine head.

The amount of extrusion suddenly drops significantly

Reason 1: The feeding system is faulty or there is no material in the hopper.
Treatment method: Check the material level of the feeding system or hopper.
Reason 2: The extrusion system enters the hard object and jams the screw, so that the material cannot pass through.
Treatment method: Check and clean up the extrusion system.

The main electric starting current is too high

Reason: insufficient heating time and large torque. A section of the heater is not working.
Treatment method: Use the hand crank when driving. If it is not easy, prolong the heating time or check whether the heaters of each section are working normally.

Low lubricating oil pressure

Reason 1: The pressure setting value of the pressure regulating valve of the lubricating oil system is too low.
Treatment method: Check and adjust the pressure regulating valve of the lubricating oil system.
Reason 2: The oil pump is faulty or the oil suction pipe is blocked.
Treatment method: Check the oil pump and oil suction pipe.

The automatic screen changing device is slow or not working

Reason 1: Air or oil pressure is low.
Treatment method: Check the power system of the screen changing device.
Reason 2: Air leakage (or oil leakage) of the cylinder (or hydraulic cylinder).
Treatment method: Check the sealing condition of the cylinder or hydraulic cylinder.

The safety pin or safety key is cut off

Reason: Excessive torque of extrusion system.
Treatment method 1: Check whether there is metal or other objects in the extrusion system to jam the screw.
Treatment method 2: When it first occurs, check whether the preheating heating time or heating value meets the requirements.