Coal machine gear sleeve replacer

The utility model discloses a gear sleeve replacing device of a coal machine. The replacer comprises a base, a supporting platform and a replacer body, rollers are arranged at the lower end of the base; a motor is arranged at the upper end of the base; the motor is connected with a bidirectional screw rod; a support frame is inserted in the middle of the bidirectional screw rod; the support frame is fixedly connected with the base; threaded sleeves are symmetrically arranged on the two sides of the supporting frame. The bidirectional screw rod is in threaded connection with a threaded sleeve; the upper end of the threaded sleeve is connected with a telescopic frame; telescopic rods are symmetrically arranged on the two sides of the telescopic frame; a supporting platform is arranged at the upper end of the telescopic rod; the device is compact in structure, light weight and convenient movement, sealing performance is good, the device is simple and convenient to operate, time-saving, labor-saving, labor-saving