Reducer axle distance adjusting mechanism and gear reducer thereof

The speed reducer shaft distance adjusting mechanism comprises a rotating shaft, an inner cavity of the rotating shaft is connected with an extension shaft through an extension mechanism, the surface of the extension shaft is connected with a connecting shaft through a locking mechanism, the extension mechanism comprises an extension plate, the surface of the extension plate is fixedly connected with a rotating bolt, and the rotating bolt is fixedly connected with the inner cavity of the rotating shaft. The utility model relates to the technical field of speed reducers. According to the speed reducer axle distance adjusting mechanism and the gear speed reducer thereof, a connecting shaft is pulled leftwards to drive a driving block to move, the driving block drives a lower driving belt to move, the lower driving belt drives a first driving wheel and a second driving wheel to rotate, and meanwhile the upper driving belt drives an extending plate to move leftwards through a fixing block; and the extension plate