Device for detecting hardness of valve rod of valve

A hardness detection device for a valve rod of a valve relates to the technical field of detection devices and comprises a Rockwell hardness tester main body, a supporting table is arranged on the Rockwell hardness tester main body, a supporting seat which ascends and descends along the vertical direction is arranged on the supporting table, and two fixing plates which move oppositely and oppositely are arranged above the supporting seat in a relatively sliding manner. Clamping plates are detachably installed on the opposite side walls of the two fixing plates, columnar valve rod clamping grooves are horizontally formed in the centers of the clamping plates, and cuboid valve rod clamping protruding parts are formed through the areas of the upper side and the lower side of the columnar valve rod clamping grooves. The utility model solves the problems in the prior art that as the valve rod of the valve is cylindrical or cuboid-shaped, the pressure head and the to-be-detected object need to be pressed tightly wh