Arm folding and unfolding structure and method of lightweight bridge intelligent detection vehicle

The invention discloses an arm folding and unfolding structure and method of a lightweight bridge intelligent detection vehicle. The arm folding and unfolding structure comprises a walking chassis, at least three electric cylinders are installed on the walking chassis, the electric cylinders are connected with telescopic cantilever shafts, the telescopic cantilever shafts are installed on an installation frame, and the telescopic cantilever shafts are connected with a suspended workbench through a rotating device; an insertion hole matched with the telescopic cantilever shaft is formed in the mounting frame, and a locking device is mounted on one side of the insertion hole; the suspended workbench penetrates through and is in sliding connection with a vertical arm, and the suspended workbench is connected with the vertical arm through a moving structure. The vertical arm is in sliding connection with a sliding vertical arm, a lifting winch is installed on the vertical arm, and the lifting winch is connected w