German ZFTK500×10 bevel gear milling machine, after commissioning, the output shaft of the chip conveyor system reducer and the scraper chain drive shaft coupling are broken. Although it is repaired as it is, faults often occur. 1. Reason analysis (1) The removed coupling is a steel piece with different thicknesses at both ends, the left end is matched with the output shaft slot of the reducer, and the right end is interference-fitted with the main shaft slot of the scraper chain (Fig. 1) . The chip removal system power comes from the motor 1, through the reducer 2, the coupling 4 transmits the torque to the scraper chain drive shaft 5, drives the chain and the sprocket 6, and is arranged by the scraper plate on the chain.

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