Clamping system for clamping annular workpiece

The utility model provides a clamping system for clamping an annular workpiece. The clamping system comprises a base plate, a plurality of inner pressing plate assemblies, a plurality of first supporting pieces, a plurality of outer pressing plate assemblies and a plurality of second supporting pieces. Each inner pressing plate assembly comprises an inner pressing plate suitable for pressing the annular workpiece from the inner side of a ring of the annular workpiece towards the base plate. The plurality of first supporting pieces are arranged on the base plate and matched with the inner pressing plates and face towards the inner pressing plates to support the annular workpiece. Each outer pressing plate assembly comprises an outer pressing plate suitable for pressing the annular workpiece from the outer side of the ring of the annular workpiece towards the base plate. The plurality of second supporting pieces are arranged on the base plate and matched with the outer pressing plates and face towards the outer pressing plates to support the annular workpiece. The inner pressing plates and the outer pressing plates are suitable for being moved from pressing positions where the workpiece are pressed to releasing positions where the annular workpiece is not contacted, or suitable for being removed from the clamping system in detachable mode. By means of the technical scheme, locating efficiency and accuracy rate of the annular workpiece can be improved, and simultaneously curve machining on the annular workpiece is convenient.