Cause analysis and solution of excessive high torque of granulator main motor?

Reason analysis: Oil lubrication system failure, poor alignment between the output shaft of the main motor of the pelletizer and the shaft of the gear box, and vibration of the motor and clutch will damage the main motor bearings and cause excessive torque. In addition, excessive feeding load or poor material fusion will also cause the main motor torque to be too high.

Solution: Regularly check and clean the lubricating oil system, measure the main motor bearing of the granulator with a vibration measuring instrument and infrared thermometer and form a trend chart If the trend value is exceeded, determine whether the main motor idling current value or power value exceeds the specified value, and determine whether the bearing should be replaced. Regularly check the alignment between the output shaft of the main motor and the input shaft of the gearbox. The alignment must be checked after running for three months after the first drive or bearing replacement. Conduct electrical test inspection to determine the cause of rotor imbalance; perform vibration speed test on the clutch, and if it exceeds the specified value, the dynamic balance should be readjusted. Regularly check the cylinder heating and cooling system to ensure that the material is heated and melted evenly. If the power curve of the main motor and the melt pressure curve increase instantaneously when the extruder starts, it indicates that the feeding amount of the feeding system is too large instantaneously, and the feeding amount should be reduced.

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