A crane main beam load turning device is characterized in that: it comprises a base and an overturning body whose rotation axis of the rotatable assembly is consistent with the length extension direction of the corresponding crane main beam, and the upper end of the overturning body is provided with a U-shaped groove with a notch facing upward. The bottom of the U-shaped groove body is provided with a support surface for supporting the bottom of the main beam of the crane, and the two sides of the groove walls of the U-shaped groove body are provided with a lock with a telescopic adjustment amount along the extension direction of the corresponding crane main beam width. A locking and positioning mechanism, the locking and positioning mechanism has a pushing end surface for press-fitting with the two side walls of the crane main beam to lock and fix the crane main beam, and the base is also provided with a turning body facing the crane. A loading mechanism that applies a loading force to rotate the inverting body about its axis of rotation.
When in use, the main beam of the crane is placed on the base, and the wire rope is passed between the base and the main beam of the crane. When the right main weld of the crane main beam needs to be welded, the wire rope of the right coiler rises, and the wire rope of the left coiler descends, and the crane main beam is turned over by the wire rope to make the right main weld in the flat welding position , Similarly, the left main weld of the crane main beam can be welded. The disadvantage of the existing main girder overturning machine is that during the overturning process of the wire rope to the crane main girder, the crane main girder will move because the crane main girder is not fixed, and there is a certain safety hazard.