Gib-head taper key protection device for transmission shaft of railroad hopper car

The invention provides a gib-head taper key protection device for a transmission shaft of a railroad hopper car. The transmission shaft is used for being connected with a butt joint component in an inserted mode, a gib-head taper key is keyed between the transmission shaft and the butt joint component, the protection device comprises a pressing mechanism and a connecting assembly, and the pressing mechanism is fixed to the end portion of the transmission shaft through the connecting assembly. The side, facing the transmission shaft, of the pressing mechanism makes contact with the gib-head taper key. According to the gib-head taper key protection device for the transmission shaft of the railroad hopper car, the pressing mechanism and the connecting assembly are matched to replace an L-shaped stop iron structure for preventing looseness and falling off of the gib-head taper key in the prior art, manufacturing and overhauling are convenient, all the components can be repeatedly used, the assembling and disassem