Equi-curvature scotch mechanism for steel bar straightener

The present invention discloses one kind of equi-curvature rotation retaining mechanism for steel bar straightener; and features that the equi-curvature rotation retaining mechanism includes two side-by-side lower straightening rollers and one upper straightening roller on the lower straightening rollers, and that both the spacing between these two lower straightening rollers and the draught amount of the upper straightening roller may be regulated to adopt steel bars of different diameters. The present invention is installed inside the horizontal roller system of steel bar straightener to make steel bar generate plastic deformation. The present invention can control the rotation of the steel bar during being straightening and reach the equal curvature of the straightened steel bar to ensure the steel bar straightening quality.