A cutting knife for cutting double -walled bellows

The utility model discloses a cutting knife for cutting double -walled bellows, its technical scheme main points are including two arc splint unanimous with the crest shape of outer bellows, the position of arc splint and the trough looks butt of outside bellows is the inner wall, there is fixed block and the fixed plate that links together two arc splint at the both ends of arc splint rigid coupling respectively, on the fixed block joint have the blade and be provided with with the retaining member of blade butt with fixed blade, rotating between two arc splint and being connected with a plurality of rollers, a plurality of rollers distribute along the circumference equidistance of arc splint, enclose the arc recess with bellows crest looks adaptation between the arc splint of both sides and the roller, the pole is controlled to equal rigid coupling on fixed block and the fixed plate, can improve the accuracy of cutting. 本实用新型公开了种用于切割双壁波纹管的切割刀，其技术方案要点是包括两片与外层波纹管的波峰形状致的弧形夹板，弧形夹板与外侧波纹管的波谷相抵接的部位为内壁，弧形夹板的两端分别固接有