Flattening tool for gear ring machining

The flattening tool comprises a base and a grinding wheel, supporting rods are arranged at the left end and the right end of the upper end face of the base, a top plate is arranged at the upper ends of the supporting rods, an air cylinder is arranged on the upper end face of the top plate, a dust collection cover is arranged below the top plate, and the center of the upper end face of the dust collection cover is rotationally connected with a rotating shaft. The upper end of the rotating shaft is rotationally connected with a piston rod of the air cylinder, a grinding wheel driving mechanism is arranged on the upper end face of the dust collection cover and drives the grinding wheel to rotate, open grooves are symmetrically formed in the upper end face of the base, movable plates are slidably connected into the open grooves, and convex teeth are arranged at the upper end of the face, away from each other, of each movable plate. The movable plate driving mechanism drives the movable plate to move synchronously