Hydraulic double-tensioning device for driving monorail crane

The invention discloses a hydraulic double-tensioning device for driving a monorail crane, comprising: a monorail crane guide rail, the front and rear side surfaces of which are provided with guide rail grooves; the driving frame is provided with walking wheels and a braking mechanism, the walking wheels are in rolling contact with the lower groove wall of the guide rail groove, and a braking friction block on the braking mechanism is in friction contact with the guide rail groove; the driving tensioning mechanism comprises two mounting sleeves, first hinge plates and second hinge plates are fixed to the outer side walls of the mounting sleeves at intervals, and the two first hinge plates are hinged to the front side wall and the rear side wall of the driving frame correspondingly; the two driving hydraulic motors are fixedly sleeved with the two mounting sleeves respectively, driving wheels are fixed to driving shafts of the two driving hydraulic motors, and the two driving wheels make rolling contact with t