Dismounting structure for preventing nut from slipping off screw nut

The utility model discloses a dismounting structure of a screw rod and a screw cap capable of preventing the screw cap from slipping off. The dismounting structure of the screw rod and the screw cap capable of preventing the screw cap from slipping off comprises a supporting body and a cap body, the supporting body is a semi-cylinder, and the diameter of the supporting body is smaller than the shape defined by the vertical face, facing the bolt head, of the clamping head and the check block. The cap body is a 1/4 sphere with the diameter matched with that of the supporting body, one face of the cap body coincides with the side plane of the supporting body, and the other face of the cap body coincides with one end of the supporting body and is fixedly connected with the supporting body. Thelength sum of the supporting body and the cap body is equal to the length of the chuck. The problem that an elastic clamping piece is difficult to press into an installation hole so that a nut can bedisassembled is solved. 本