Show off clamp member annular interior

An endless clamp member inner show off, comprising: a center post assembly, the holder base, and carrying off the force component developing Straightening assembly, wherein: the bottom end of the center pillar assembly is provided on the holder base, show off assembly as set Straightening force to the top center pillar assembly connected component, there are several auxiliary lever connected for transmission between the component and the folded shape correction exhibition center pillar assembly of the present invention, multi-point load, so that a more uniform clamp load and the correction effect of shape, having an auxiliary support the lever, the force loading mechanism, and other auxiliary components, improving the accuracy of the clamp, the rigidity of the shape correction capabilities, improved quality of the assembly welding of thin-walled cylinder member.