Single-stage worm and gear speed reducer

The utility model discloses a single-stage worm and gear speed reducer. The speed reducer comprises a speed reducer body, one side of the speed reducer body is connected with a connecting flange; theconnecting flange is connected with the output end of the motor; the bottom of the side, close to the connecting flange, of the speed reducer body is fixedly connected with a fixing ring. A threaded sleeve I is clamped in the fixed ring; a screw rod I is in threaded connection with the interior of the threaded sleeve I; a connecting sleeve is arranged on the side, away from the fixing ring, of thefirst threaded sleeve. The bottom end of the connecting sleeve is fixedly connected with a cushion block; the top of the connecting sleeve is connected with a connecting mechanism; and the top of theconnecting mechanism is connected with an attaching mechanism, a fixing sleeve is fixedly connected to the position, close to the worm, of the side, away from the connecting flange, of the speed reducer body, a screw rod is in