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1. It uses the technique of individual-roller driven patent, eliminates the mechanical intervention of each roller, negative-torque phenomenon and each kind of problem caused by it, therefore it prolongs the life of working rollers and protects the surface of the workpiece2. Individual-roller driven also achieves the mode of linear decreasing leveling, and conforms to the leveling rule of steel plate, reaches the leveling precision as required. Since the pressing value decreases gradually, this mode decreases the total distortion degree of the material relative to the mode of deforming leveling. Therefore the total leveling forces and power-waste will be reduced so as to save the energy source3. It uses holistic close frame, transitted by foursquare circular, and arranges the steel bar reasonably, so it has both a good rigidity and intensity, exhibiting a beautiful appearance and a smooth line4. All the rolling bearing, worm gear case and active pair such as lead crew pair use the bili