Crane running mechanism

The utility model discloses a crane running mechanism, which relates to the technical field of hoisting machinery and comprises a gantry crane lower cross beam, a first slewing bearing, a support, a balance beam, a second slewing bearing, a trolley frame, a wheel group and a speed reducer, the support is installed on the upper portion of the balance beam and extends upwards, the portal crane lower cross beam is located above the support, and the first slewing bearing is assembled between the portal crane lower cross beam and the support. The bogie frame is located below the balance beam, the second slewing bearing is assembled between the bogie frame and the balance beam, the wheel set is installed on the bogie frame, the speed reducer is connected to the outer side of the wheel set, and the speed reducer drives the wheel set to rotate at a different speed during turning and normally rotate during linear walking. A double-slewing bearing structure is adopted, so that the turning capacity of the running mechan