Grinding mechanism for transmission shaft of speed reducer

The utility model relates to the field of speed reducer transmission shaft polishing, and discloses a speed reducer transmission shaft polishing mechanism which comprises a workbench, two sets of fixing frames are fixed to the position, close to the side wall, of the top of the workbench, chucks are fixed to the side surfaces of the two sets of fixing frames, and a plurality of sets of fixing claws are arranged on the surfaces of the chucks in a circumferential mode. And opening, closing and fixing of the chuck surface fixing claws can be achieved by rotating an annular handle rotationally installed on one side of the fixing frame, the movable grinding assembly is installed on the inner wall of an annular sliding groove in a sliding mode through the annular sliding groove, and a certain position of the cylindrical surface or shaft bodies of non-cylindrical surfaces of different shapes can be fixedly ground. A sliding block is installed on the side surface of the screw in a threaded mode, a grinding device is