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Causes of Common Malfunctions in Rubber Extruders and Their Troubleshooting Methods

Time：

2018-06-26

I. Causes of the main motor of the rubber extruder failing to start: Incorrect startup procedure; issues with the main motor’s wiring; blown fuse. Remedial measures: Verify the procedure and restart according to the correct sequence. Inspect the main motor circuit. Check whether the lubrication oil pump has started, and verify the status of interlock devices associated with the main motor. If residual induced voltage remains in the frequency converter, switch off the main power supply, wait for 5 minutes, then restart. Ensure the emergency stop button has been reset. II. Causes of abnormal noise from the main motor of the rubber extruder: Damaged main motor bearings; failure of a specific thyristor in the main motor’s silicon-controlled rectifier circuit. Remedial measures: Replace the main motor bearings. Inspect…

1. The main motor of the rubber extruder cannot start.

Cause: There is an error in the driving program. The main motor thread has a problem, and the fuse may have blown.

Troubleshooting steps: Verify the procedure and restart the equipment in the correct startup sequence. Inspect the main motor circuit. Confirm that the lubrication oil pump has started, and check the status of interlocks associated with the main motor. If residual induced voltage remains in the variable-frequency drive, disconnect the main power supply, wait for 5 minutes, and then restart. Ensure that the emergency stop button has been reset.

II. Abnormal Noise from the Main Motor of the Rubber Extruder

Cause: Damage to the main motor bearing; failure of a specific thyristor in the main motor’s thyristor rectifier circuit.

Remedy: Replace the main motor bearings. Inspect the thyristor rectifier circuit and replace the thyristor components as needed.

III. Unstable Current in the Main Motor of the Rubber Extruder

Causes: uneven feeding, damage or inadequate lubrication of the main motor bearings, failure of a heating element in a specific section resulting in no heating, improper screw adjustment shims, incorrect phase alignment, or component interference.

Troubleshooting steps: Inspect the feeder and rectify any malfunctions. Overhaul the main motor and replace the bearings if necessary. Verify that all heaters are functioning properly, replacing them as needed. Examine the adjustment shims, retract the screw, and check for any interference with the screw.

IV. Excessive Temperature Rise in the Main Motor Bearing of the Rubber Extruder

Causes: Poor bearing lubrication; severe bearing wear;

Remedy: Inspect and apply lubricant; check the motor bearings and replace them if necessary.

V. Poor discharge or blockage at the die head of the rubber extruder

Cause: A section of the heater is not functioning, resulting in poor material plasticization. The set operating temperature may be too low, or the polymer may have a broad and unstable molecular weight distribution. Foreign matter that is difficult to melt may also be present.

Troubleshooting procedure: Inspect the heater and replace it if necessary. Verify the set temperatures for each zone, and, if required, coordinate with the process engineer to increase the temperature setpoints. Clean and inspect the extrusion system and the die head.

VI. Excessive Starting Current of the Main Motor in the Rubber Extruder

Cause: Insufficient heating time and excessive torque; a section of the heater is not functioning.