Gantry crane with auxiliary hinge point shaft system and hinge point maintenance method

The invention discloses a gantry crane with an auxiliary hinge point shaft system and a hinge point maintenance method.The crane comprises a seat frame and a suspension system, the suspension system comprises a large pull rod, an arm frame and a trunk beam, and one end of the large pull rod and one end of the arm frame are hinged to the seat frame; the other end of the large pull rod and the other end of the arm support are respectively hinged with the trunk beam; a first hinge seat is arranged on the side, away from the large pull rod, of the arm support, a second hinge seat is arranged on the side wall of the trunk beam, when the suspension system is adjusted to be in the minimum amplitude state, the connecting portions of the first hinge seat and the second hinge seat coincide, and the minimum amplitude state is the state that the included angle between the side, away from the large pull rod, of the arm support and the trunk beam is the minimum included angle. Maintenance platforms are installed at the hin