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Fault analysis of plastic extruder

by:TENGDA     2023-01-07

​Plastic extruder is a common plastic machinery and equipment. During the daily operation of the extruder, various failures will inevitably occur in the extruder, which will affect the normal production of plastic machinery. Next, we will discuss the extrusion Machine fault analysis in detail.

1. The extrusion volume suddenly drops significantly

Reason 1: The feeding system fails 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 blocks the screw of the plastic extruder, so that the material cannot pass through.

Treatment method: check and clean the extrusion system.

2. The main electric starting current is too high

Reason: Insufficient heating time and high torque. A section of the heater in the plastic extruder does not work.

Treatment method: Use hand wheel when driving. If it is not easy, extend the heating time or check whether the heaters in each section are working normally.

3. Lubricating oil pressure is low

Reason 1: The pressure setting value of the pressure regulating valve of the lubricating oil system is too low.

Solution: Check and adjust the lubricating oil system pressure regulating valve.

Reason 2: The oil pump of the plastic extruder is faulty or the oil suction pipe is blocked.

Solution: Check the oil pump and oil suction pipe.

4. The automatic screen changing device is slow or ineffective

Reason 1: Air pressure or oil pressure is low.

Solution: Check the power system of the screen changer.

Reason 2: The cylinder (or hydraulic cylinder) leaks air (or oil).

Treatment method: Check the sealing condition of the air cylinder or hydraulic cylinder.

5. Safety pin or key cut off​

Cause: Excessive torque in the extrusion system.

Treatment method 1: Check whether there is metal or other objects entering the extrusion system to block the screw.

Solution 2: Check whether the warm-up time or temperature rise value meets the requirements at the beginning

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