Clamp for positioning shaft parts

A clamp for positioning shaft parts comprises a fixed clamp base, wherein, a U-shaped bayonet longitudinally penetrating the upper and the lower surfaces of the fixed clamp base is formed in the middle of one side surface of the fixed clamp base, positioning cambered surfaces are longitudinally arranged on two sides of the opening of the U-shaped bayonet, two moving clamp bases are arranged side by side in correspondence to the side surfaces where the U-shaped bayonet of the fixed clamp base is positioned, positioning inclined surfaces corresponding to the U-shaped positioning cambered surfaces are longitudinally formed at the end parts of the moving clamp bases, and the two longitudinal positioning cambered surfaces of the U-shaped bayonet on the fixed clamp base and the longitudinal positioning inclined surfaces on the two moving clamp bases are combined to form a clamp opening which has four concentric points and can be used for clamping shaft parts. Through the positioning clamp opening with four concentr