Clamping protection device for wire fatigue performance test

A clamping protection device for wire fatigue performance testing belongs to the field of material fatigue performance testing, the device is composed of a wedge-shaped clamping device and an auxiliary positioning device, the wedge-shaped clamping device is composed of four wedge-shaped clamping blocks, the clamping surfaces of the inner sides of the wedge-shaped clamping blocks are provided with occlusion patterns, and the clamping surfaces of the inner sides of the wedge-shaped clamping blocks are provided with the occlusion patterns. The bottom ends of the left side and the right side of the wedge-shaped clamping block are provided with positioning clamping grooves used for clamping the progressive metal foil, and the thickness of the progressive metal foil is increased from top to bottom in a stepped mode. The auxiliary positioning device consists of a fixed base, a scale rod, a movable cantilever, a central positioning groove, an edge bayonet and a positioning ring; a scale rod is arranged on the fixed b