General purpose gantry crane

Abstract

The invention relates to a general purpose gantry crane which comprises a gantry girder and legs which are arranged at two sides of the gantry girder. The crane is characterized in that the leg at one side of the legs at two sides is a rigid leg, and the other leg is a semi-rigid leg; the rigid leg is fixedly connected with the gantry girder through a connecting bolt; and the upper end of the semi-rigid leg is combined with the gantry girder through hinged supports which are respectively welded on the gantry girder and the semi-rigid leg and matched with each other, in a mode of hinge jointing.

Description

technical field [0001] The invention relates to a general gantry crane. Background technique [0002] General-purpose gantry cranes are widely used. In order to maximize the utilization of equipment and reduce production costs, many gantry cranes have a steering function, which can realize multi-area hoisting construction, but these steerings are empty, especially for large-tonnage gantry cranes. type crane. The existing gantry crane gantry structure cannot realize heavy-load steering, especially for large-span and high-height gantry cranes, it is even more difficult to realize heavy-load steering. The reason is that the steering of the gantry crane under heavy load conditions will cause the deformation of the main girder and cause downward deflection, and the two outriggers will generate a horizontal lateral force. For the double rigid leg gantry crane, this horizontal force cannot be overcome. Yes, when the gantry crane turns to do lateral movement, the span value of the...

AI Technical Summary

Problems solved by technology

The existing gantry crane gantry structure cannot realize heavy-load steering, especially for large-span and high-height gantry cranes, it is even more difficult to realize heavy-load steering

The reason is that the steering of the gantry crane under heavy load conditions will cause the deformation of the main girder and cause downward deflection, and the two outriggers will generate a horizontal lateral force. For the double rigid leg gantry crane, this horizontal force cannot be overcome. Yes, when the gantry crane turns to move laterally, the span value of the crane will increase due to this horizontal force, and when it turns again, the increase in the span value will prevent the wheels on the trolley from falling on the rails

The larger the span, the higher the lifting height, the greater the lifting weight, and the greater the change in the span value, so the double rigid leg gantry crane cannot realize heavy load steering

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