Holding mechanism of annular polisher

The utility model discloses a holding mechanism of an annular polishing machine. The device comprises more than three holding units, the retaining units are distributed along the circumferential direction of the grinding disc (3); the maintaining unit comprises a maintaining supporting column (21), a maintaining frame (22), a driving motor (23), a driving wheel (24) and a driven wheel (25). The retaining support column (21) is fixedly mounted on the adjusting cylinder; the fixed end of the retainer (22) is fixedly mounted on the retaining support column (21); the driving wheel (24) is mountedat the free end of the retainer (22); the driving motor (23) is fixedly mounted on the retainer (22), and the driving wheel (24) is in transmission connection with the driving motor (23). According tothe utility model, the retaining unit is arranged in the circumferential direction of the millstone to apply retaining force to a workpiece to be machined, so that the equipment retentivity is improved, and the machining prec