High-strength arc screw hardness detection device

The utility model relates to the technical field of machining, in particular to a hardness detection device for a high-strength arc screw. Wherein the arc positioning support is used for fixing the top end of the high-strength arc screw, and the outer cylinder positioning fixing block is arranged on the arc positioning support and fixed through an inner hexagonal cylinder head screw. The outer cylinder positioning movable block is arranged on the arc positioning support, is fixed through an inner hexagonal fillister head screw and is matched with the outer cylinder positioning fixed block to position the outer cylindrical surface position of the high-strength arc screw, and the Rockwell hardness detection position of the high-strength arc screw is detected from the original enlarged outercylinder; the thread end face of the high-strength arc screw is changed into the thread end face of the high-strength arc screw, it is guaranteed that the size precision and the surface roughness of an outer cylinder of the h