Gapless main shaft locking device with improved structure

The utility model discloses a gapless main shaft locking device with an improved structure, which comprises an output shaft, a power output disc, a check ring and a locking pin, the power output discis connected to a driving device, one end of the output shaft is provided with a polyhedral shaft, the polyhedral shaft comprises a locking section and a power transmission section, and a locking plane matched with the locking pin is arranged in the circumferential direction of the locking section; the power output disc is provided with a driving structure used for transmitting power, the power transmission section is provided with a driven structure used for transmitting power, and the driving structure is matched with the driven structure; the surface of the power output disc is provided with partition columns protruding upwards in the circumferential direction, a damping block is arranged between every two adjacent partition columns, a locking pin is arranged between each partition column and the corresponding