Pin penetrating device for grabbing beam of portal crane

The invention belongs to the technical field of water conservancy and hydropower equipment, and particularly discloses a portal crane grabbing beam pin penetrating device. The door machine grabbing beam pin penetrating device comprises a door machine lifting hook, a guide sleeve assembly, a lead screw, a connecting pin, a first connecting end cover, a sealing assembly and a driving piece. The door machine lifting hook is provided with a first pin hole. The guide sleeve assembly is arranged on one side of the portal crane lifting hook; the lead screw is provided with a working end and a connecting end, the lead screw rotates in the guide sleeve assembly, the working end is located in the guide sleeve assembly, the connecting end is located outside the guide sleeve assembly, the connecting pin is in threaded connection with the exterior of the lead screw, the connecting pin is inserted into the first pin hole, and the connecting pin can move relative to the portal crane lifting hook; the first connecting end co