Internal expansion type clamp for polishing motor shell

The utility model relates to the technical field of clamping devices, and discloses an internal expansion type clamp for polishing a motor shell, which comprises a screw rod, the right part of the screw rod is in threaded connection with a threaded groove, the threaded groove is arranged on the middle side of the left end in a second fastening piece, and the right end of the second fastening piece is fixedly connected to the middle part of the left side wall of a mounting plate. According to the utility model, the first fastener gradually extrudes the sleeve towards the outer side in the process of inserting the first fastener into the sleeve rightwards, so that the left part of the sleeve expands through the expansion groove on the left side of the periphery of the sleeve, and the left side of the sleeve extrudes the through hole outwards to fix the left side of the motor shell main body; the inner side wall of the right end of the sleeve is gradually extruded outwards by the periphery of the second fastener