Retractable detection arm equipment for bridge detection

The invention relates to the field of bridge detection equipment, and discloses retractable detection arm equipment for bridge detection, which comprises an external screen positioned on a main extension arm and used for receiving working data of a laser scanning camera and displaying the working data to people; the crack cleaning mechanism is located on the bogie, cleans bridge bottom wall crack attachments through vibration and conducts adjustment according to the crack size; the folding and unfolding driving mechanism is located on the main extension arm, and the bridge detection arm equipment can be folded and unfolded through manual operation of personnel. Through the design of the main extension arm and the auxiliary extension arm, the whole equipment can be conveniently folded, unfolded and controlled, meanwhile, the adaptability in different bridge structures is guaranteed, the portable requirement of maintenance personnel is considered in the equipment design, the stability and operation convenience