Quick-opening blind plate self-locking type safety bolt

The utility model provides a quick-opening blind plate self-locking type safety bolt. The quick-opening blind plate self-locking type safety bolt comprises a piston, a bolt sleeve and a bolt body. The bolt sleeve is a stepped cylinder and is provided with an axial stepped hole and a radial through hole, and the upper end of the axial stepped hole is communicated with the radial through hole. The bolt body and the bolt sleeve are fixedly connected to the open end of the lower-section stepped hole, the contact face of the bolt body and the bolt sleeve is sealed, and the bolt body is provided with an axial through hole. The piston is slidably arranged between the bolt sleeve and the bolt body, and the diameter of the piston seat is the same as the inner diameter of the lower section stepped hole. When the piston seat makes contact with the top face of the bolt body, the top face of the piston rod is flush with the upper end face of the upper-section stepped hole, and when the piston seat moves in the axial direc