Thigh length adjusting device for rehabilitation robot

The invention discloses a thigh length adjusting device for a rehabilitation robot, belonging to the field of medical facilities. According to the device, a feed screw is driven to rotate by an electric motor, a feed screw nut is driven to rotate, and finally a dovetail groove sliding block fixed with a connecting rack is moved, so that the extension of a thigh can be realized when in rehabilitation training. According to the thigh length adjusting device, a potential device is driven to rotate by a thread rope pulling rope pulley so that the telescopic length of the thigh is recorded; the screw thread clearance of the feed screw is eliminated through the matching of the feed screw and the nut, the matching between the dovetail groove sliding block and a dovetail groove guiding rail is adjusted through the dovetail groove adjusting block capable of adjusting the distance, the dovetail groove adjusting block can adjust the clearance between the motion planes of the dovetail groove sliding block in normal direction and also can adjust the clearance between the side faces of the dovetail groove sliding block in motion direction, and the motion direction of a dovetail groove is always parallel to the transmission direction of the feed screw. The device is high in positioning accuracy, high in motion intuition, large in integral rigidity of system, relatively easy to realize in structure, simple in a driver and a control structure.