Clamp used for turning of threads of perpendicularly intersecting shafts

The invention discloses a clamp used for turning of threads of perpendicularly intersecting shafts. A supporting surface of an annulus body is formed by the cambered surfaces of two rib plates jointly. An opening in the circumference of the annulus body is located between the two rib plates. A connecting surface on the circumferential surface of a positioning ring makes contact with the surface of a clamping plate and is fixed to the surface of the clamping plate. The lower surface of the positioning ring makes contact with the upper end face of the annulus body and is fixed to the upper end face of the annulus body. A positioning stopping opening in the upper surface of the positioning ring is used for mounting of a workpiece. A bottom plate is welded and fixed to the lower end face of the annulus body, and the plane on the circumference of the bottom plate corresponds to the opening in the circumference of the annulus body in position. Through the clamp, the effect that the threaded rotation shaft is shifte