Gapless main shaft locking device with improved structure

The invention discloses a gapless main shaft locking device with an improved structure. The gapless main shaft locking device comprises an output shaft, a power output disc, a stop ring and locking pins, wherein the power output disc is connected to a driving device, a polyhedral shaft is arranged at one end of the output shaft, the polyhedral shaft comprises a locking section and a power transmission section, locking planes matched with the locking pins are 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, the driving structure is matched with the driven structure, spacing columns protrudingupwards are arranged on the surface of the power output disc in the circumferential direction, a damping block is arranged between every two adjacent spacing columns, the locking pins are arranged between the spacing columns