Device for detecting telescopic steel wire rope in main arm of truck crane

The invention discloses a device for detecting a telescopic steel wire rope in a main arm of a truck crane. The device comprises a control box and a mounting block, wherein one side of the control box is fixedly connected with a touch screen; a controller, a memory and a power supply are sequentially arranged in the control box; one end of the mounting block is sequentially and fixedly connected with a camera and an illuminating lamp; the bottom of the mounting block is fixedly connected with a fixed block; one side of the fixed block is fixedly connected with a motor; a through hole is formed in the fixed block; the output end of the motor penetrates through the outer wall of the fixed block and extends into the through hole; the extending end of the motor is fixedly sleeved with a guide wheel; the outer wall of the guide wheel is fixedly connected with a plurality of bumps; and the output ends of the touch screen, the power supply and the camera are connected with the input end of the controller. According