Vertical lifting device for lower sealing head of nuclear power steam generator

The utility model relates to the technical field of nuclear power steam generators, in particular to a vertical lifting device for a lower sealing head of a nuclear power steam generator. The vertical lifting device for the lower end socket of the nuclear power steam generator specifically comprises a lifting machine and a lifting body, the lower sealing head comprises a manhole and a plurality of threaded holes formed around the manhole; the hoisting body comprises a hoisting handle, a cover plate and a plurality of connecting pieces, the hoisting handle is fixedly connected with the cover plate, the hoisting handle is detachably connected with the hoisting machine, the cover plate covers the manhole, a plurality of through holes are formed in the cover plate, and the connecting pieces penetrate through the through holes and are detachably connected with the threaded holes; the lifting handle comprises a main lifting hole, and the lifting point position of the main lifting hole corresponds to the gravity cen