Device for replacing sample piece without lifting cross beam in high-cycle fatigue test

The invention provides a device for replacing a sample piece without lifting a cross beam in a high-cycle fatigue test, which comprises a base, a cover body, a stud, a nut, a wedge-shaped block and a base jacking block, and is characterized in that the stud is fixed on one side of the cover body and is used for penetrating through the base and being matched with the nut for fixation; the wedge-shaped blocks are arranged in the cover body in pairs and are used for clamping a sample piece; wherein the wedge-shaped block inclines inwards from one side facing the base to the other side; the base jacking block is arranged between the base and the cover body and used for jacking the wedge block, the cover body is provided with a side opening, and the sample piece is inserted into the cover body from the side opening. The invention has the beneficial effects that through the design of the clamp side opening, the sample piece can be replaced from the clamp side opening after the locking stud is unscrewed, the manual