The straightening mechanism is characterized by that a high-speed rotating sleeve with oval inner hole or eccentric inner hole is placed outside of a fixed beam with axial rectangular long groove, and some guidenway blocks with rectangular slideway are distributed in the long groove of the fixed beam, and each guideway block is equipped with a slide block, and in each slide block a pair of rollers forming a circular hole is placed, and the steel bar can pass through the middle of the rollers so as to attain the goal of straightening steel bar. |