Grinding and polishing device for mechanical gear machining

The utility model discloses a grinding and polishing device for mechanical gear machining, belongs to the technical field of gear machining, and aims to solve the problem of low grinding efficiency caused by incapability of turning over a gear. The grinding and polishing device comprises a base, supporting rods are fixedly connected to the top of the base close to four corners, and a top plate is fixedly connected to the tops of the supporting rods; the top of the base is slidably connected with a connecting seat, the bottom of the connecting seat is in threaded connection with a threaded rod and is rotationally connected with the top of the base, the left side and the right side of the top of the top plate are fixedly connected with first air cylinders, and the bottoms of the first air cylinders penetrate through the top plate and are fixedly connected with grinding devices; a clamping mechanism is arranged on the turnover mechanism; through the arrangement of the turnover mechanism, a gear which is clamped