Monorail crane emergency braking device

The invention discloses a monorail crane emergency braking device. The device which comprises a frame body; a plurality of rotating wheels are symmetrically and movably connected to the two sides of the top end of the frame body; the frame body is clamped on a monorail crane through the rotating wheels and can move; one rotating wheel is a tachometer wheel, and the other rotating wheels are walking wheels; a brake arm assembly is movably connected to the middle of the outer side face of the frame body through a first pin shaft, and a brake block is movably connected to the top end of the outerside face of the brake arm assembly through a second pin shaft; a hydraulic reciprocating assembly is arranged at the bottom end of the interior of the frame body, and a sliding block is fixedly connected to one end of the hydraulic reciprocating assembly; and a manual brake assembly is arranged outside the brake arm assembly, and a speed limiting brake triggering mechanism is arranged on the side face, where the tachome