Clamping device for flexible circular ring

The utility model discloses a clamping device for a flexible circular ring, which comprises a connecting shaft flange, a connecting plate, two cylinders, two hinges and two single tool components, each single tool component comprises a plurality of clamping jaws, a clamping jaw fixing disc, a plurality of lower cover plates, a rotating shaft disc, a clamping jaw driving lever and an upper cover plate, the two air cylinders are connected with the clamping jaw driving levers of the two single tool assemblies through the two hinges correspondingly, and the two air cylinders are connected through the connecting shaft flange. By means of the mode, the clamping jaw driving lever is adopted to drive the rotating shaft disc to rotate, the arc-shaped guide grooves push the clamping jaws to move in the linear guide grooves in a limited mode, the clamping jaws do linear motion in an outward radiation mode on the axis, the concentric positions of all the clamping jaws can be kept at the same time, the structure is novel,