Polishing device for internal combustion engine crankshaft machining and production

The utility model discloses a polishing device for internal combustion engine crankshaft machining and production, belongs to the technical field of crankshafts, and aims to solve the problems that in the crankshaft machining process, a crankshaft needs to be polished and is generally polished through a polishing machine or a polishing gun, however, polishing heads of different shapes and sizes cannot be replaced according to different polishing positions, and the polishing efficiency is high. The grinding device comprises a gun body, a driving motor is embedded in the side wall of one side of the gun body, a main shaft is fixed to an output shaft of the driving motor through a coupler, a grinding head is installed at the end, away from the driving motor, of the main shaft, and a first groove is formed in the side wall of the side, away from the driving motor, of the main shaft; the side walls of the two sides of the first groove are provided with second grooves which are symmetrically formed. According to th