Rope stretching device for detecting hardness of metal wire

The utility model relates to the field of tension detection, in particular to a rope stretching device for detecting the hardness of a metal wire. The device comprises a bottom plate, a main body is installed at the top of the bottom plate, two limiting blocks are symmetrically installed on the inner walls of the two sides of the main body, two limiting rods are symmetrically installed on each limiting block, a sleeve is installed at the other end of each limiting rod, an automatic push rod is installed between the limiting rods, and one end of the automatic push rod is connected to the corresponding limiting block. Two sets of limiting holes are symmetrically formed in the top and the bottom of the sleeve, and the sleeve is located between the two sets of fixing devices. The two sets of sleeves are attached to form a complete sleeve through the automatic push rod, the sleeves can be kept at the fixed positions and cannot deviate through the limiting rods, meanwhile, limiting holes are reserved in the upper s