Steering axle, steering control system and crane

The invention discloses a steering axle, a steering control system and a crane, the steering axle is mounted on a rear wheel of a vehicle and comprises a driving shaft, and the driving shaft is connected with a tire through a cross shaft universal joint and a connecting shaft; an axle housing is arranged outside the driving shaft and is connected with the upper main pin; the steering knuckle is coaxially arranged on the connecting shaft, the steering knuckle is connected with the upper main pin through a first bearing, and the steering knuckle is connected with the lower main pin through a second bearing; a motor is installed at the tail end of the upper main pin, when the motor receives a steering signal, the motor drives a steering knuckle to rotate, the steering knuckle rotates around the main pin through a first bearing and a second bearing, a tire starts to steer, and the steering angle of the tire is accurately controlled by controlling the motor to rotate. According to the technical scheme, the rear wh