Rehabilitation training chest expander

The invention discloses a rehabilitation training chest expander, and relates to the technical field of rehabilitation training instruments. The device comprises a shell and two pull rings, the shell is filled with non-Newtonian fluid; a connecting shaft is coaxially arranged in the shell; the connecting shaft is in sealed sliding connection with the shell; one end of an adjusting screw is fixedly connected with the connecting shaft, and a piston is rotationally mounted at the other end; damping blades are hinged to the outer side wall of the piston in the circumferential direction; damping shifting pieces are vertically and fixedly mounted on the outer walls of the damping blades; the outer wall of the adjusting screw is in engaged connection with a screw nut; the outer wall of the screw nut is fixedly sleeved with a mounting ring; and frameworks are correspondingly matched with the damping blades in position, and the frameworks are matched with the damping blades in a hinged mode. The rehabilitation trainin