Precise cutting device of wear-resistant large-specification gear ring for engineering machinery

The utility model discloses a precise cutting device of a wear-resistant large-specification gear ring for engineering machinery, which comprises a fixed base, a gear ring bearing mechanism is arranged at the top of the fixed base, a support frame is fixedly connected to one side of the fixed base, a cutting mechanism is arranged at the end part of the support frame, the gear ring bearing mechanism comprises a bearing turntable, and the bearing turntable is fixedly connected with the fixed base. An air distribution column is fixedly connected to the center of the top end of the bearing rotary disc, a plurality of guide seats are fixedly connected to the side surface of the air distribution column, and piston rods are slidably connected to the interiors of the guide seats; the gear ring bearing mechanism is arranged, an air pump introduces air into each guide seat, the air pushes a piston rod to move, the piston rod moves to drive a fixed tooth block to move, the fixed tooth block is embedded into a tooth groo