Polishing auxiliary tool

The utility model relates to a grinding auxiliary tool, and relates to the technical field of valve production. The device comprises a rack, a tray, a rotating shaft and a motor, the tray is rotationally connected to the top wall of the rack, the bottom wall of the tray is coaxially and fixedly connected with the top end of the rotating shaft, an output shaft of the motor is coaxially and fixedly connected with the bottom end of the rotating shaft, a flange blank is coaxially arranged on the tray, and the device further comprises a fixing mechanism used for fixing the position of the flange blank. The fixing mechanism comprises a plurality of clamping plates and an adjusting assembly used for adjusting the positions of the clamping plates. The multiple clamping plates are distributed in the circumferential direction of the tray and connected with the adjusting assembly. The adjusting assembly is arranged on the tray and used for adjusting the multiple clamping plates to move in the radial direction of the tra