Steam cover nut of double-extraction type steam turbine

The utility model discloses a steam hood nut of a double-extraction type steam turbine, relates to the technical field of nuts, and solves the technical problems that external anti-loose structural members are more and inconvenient to install, and pre-tightening force generated by smaller internal anti-loose elastic members is limited, the steam hood nut of the double-extraction type steam turbine comprises a hexagonal body, a beveled body and a base body, and the hexagonal body is movably connected to the upper side of the beveled body; the utility model relates to a double-nut structure of a hexagonal body and a beveled body, which is characterized in that the double-nut structure of the hexagonal body and the beveled body is adopted, so that a threaded rod which is connected and fastened in a threaded manner is subjected to additional friction force; the contact surface of the hexagonal body and the inclined plane body is a conical inclined plane, the equivalent friction area is increased, the static frict