Core technology and innovations Individual roll drive and variable roll plate leveling machine: 1. Patent of Individual roll drive is adopted (patent No: 99 2 37340.9), it means that each drive is driven by a independent reducer, in this way, the mechanical interference between plate and drive roll and negative torque can be eliminated , the use life of work roll is prolonged and working surface is protected. The plate leveling machine of 7 rollers and 9 rollers are using this technology. 2. The adoption of individual roll drive can realize the leveling method of linear decrement pressing for medium & thick plate. Because it conforms to leveling principle of steel plate, the mechanical efficiency and one-time leveling precision have been greatly increased. At the same time, compared with deformation of parallel bended, such action reduces the degree of the material deformation. Therefore, aggregate leveling force and power consumption decreased correspondingly. 3. Variation of rolls(patent No: 03101384.8),leveling rolls vary between n+2 and n, which take into account unparallel leveling requirement ranging from thin to thick plates and expand the working scope of the machine. 4. It adopts combined pressing device of mechanic and hydraulic power, leveling and pressing can work together, and the reduction can be adjusted at random and controlled precisely. Pressing efficiency is greatly increased. 5. Integrated closed stander is adopted, it has smooth great circular arc on each corner and reasonable rib plate distribution. The rigidity of the machine is greatly increased.