Camber prefabricating device of crane main girder

The utility model relates to the filed of production of crane components and parts, in particular to a camber prefabricating device of a crane main girder. The camber prefabricating device of the crane main girder comprises a lifting support. The lifting support comprises two oppositely arranged supporting seats and a bearing cross beam transversely arranged between the two supporting seats. Each supporting seat is provided with a lifting drive mechanism, one end of the bearing cross beam is erected on the lifting drive mechanism of one supporting seat, the other end of the bearing cross beam is erected on a lifting mechanism of the other supporting seat, and the lifting drive mechanisms on the two supporting seats are synchronous lifting drive mechanisms. In the process of camber prefabrication on the crane main girder, a U-shaped groove of the crane main girder can be placed on the bearing cross beam, and then the bearing cross beam is jacked to a proper height through the lifting drive mechanisms. Due to the facts that the height is adjustable and distance errors of lifting supports can be remedied, camber prefabrication of crane main girders of the most specifications can be achieved through positioning at a time; accordingly, the problems that the efficiency for camber prefabrication of the crane main girders is low and labor intensity is large can be solved.