Crankshaft positioning clamp for machining center

The crankshaft positioning clamp for the machining center comprises a supporting guide seat used for supporting, two rows of positioning insertion holes used for positioning are evenly formed in the inner end face of the supporting guide seat at equal intervals, and a supporting device used for limiting is fixedly arranged on the inner end face of the supporting guide seat through the positioning insertion holes. The upper end face of the supporting device is in threaded connection with a limiting device used for transmission. By arranging the limiting device, when crankshafts with different radiuses are limited, the stepping motor can synchronously drive the two sets of bidirectional lead screws to rotate through meshing of the synchronous belt wheel and the synchronous belt, and the bidirectional lead screws can drive the positioning clamp and the fixed clamping plate to move up and down through threaded connection with the threaded sliding seat; crankshafts with different radiuses can be conveniently clamp