Door operator of cranking arm

The utility model discloses a door operator of cranking arm comprises aircraft nose, drive arrangement, actuating lever, connecting rod and gate link, and drive arrangement sets up in the aircraft nose and connects the actuating lever, and the aircraft nose includes housing and bottom plate, the housing on be equipped with the separation and reunion handhole door, said drive arrangement includes motor, worm wheel, worm, worm-wheel shaft and reducing gear box, and the output shaft on the motor is inserted in the hole of worm, and the cylindric lock of motor is inserted in the cross slot of worm, and the worm wheel is connected to the worm, and the worm wheel overlaps on the worm-wheel shaft, still is equipped with clutch between worm wheel and the turbine shaft, turbine shaft connection actuating lever, the utility model discloses a transmission structure adopts the worm gear transmission, and is firmly durable, and has switch door limit function concurrently, and safe and reliable has designed unique clutch, can manually open the door with the rotatory clutch of key under the outage circumstances, convenient more easy-to-use.