Hinge shaft devices of flexible support legs of gantry crane

The invention discloses hinge shaft devices of flexible support legs of a gantry crane, and relates to the gantry crane. The hinge shaft devices solve the problems of complex gantry crane structure, great dead weight, high manufacturing cost, inconvenient maintenance and poor flexible support leg side stability caused by a spherical hinge mode adopted in the conventional flexible support legs. The hinge shaft devices are characterized in that: the number of the hinge shaft devices is two, and the two hinge shaft devices are arranged in the flexible support legs below two main beams; each hinge shaft device consists of a hinge shaft, an upper support and a lower support; the upper support and the lower support are hinged together by the hinge shaft; the upper support is connected with a gantry; and the lower support is connected with the flexible support leg. The hinge shaft devices can be widely applied to the gantry crane with double main beams and a single trolley.