1. The upper row of rollers is the collectively tilted and adjusted. The upper row rollers are mounted on the tilt-able beam and the bending from the entrance to the exit is gradually reduced. It can achieve large and small deformation, higher straightening speed and easy adjustment. Therefore it is widely used.
2. Each roller of the flattening machine can be adjusted independently. Each upper roller has an independent bearing box and a reduction adjustment mechanism to ensure any height adjustment. In addition, it is usually possible to move the upper part of the frame relative to the lower part for collective adjustment. Higher straightening accuracy is achieved. However, the structure is complex, so in practice the number of rolls is usually small.
3. The upper row of rollers are jointly adjusted in parallel to the height. The upper row of rollers is fixed on the parallel lifting beam and can only be adjusted up and down in parallel within the group, so the rollers have the same pressure and the structure is relatively simple. However, this adjustment method can only achieve high straightening accuracy with small effective bending deformation, otherwise it will produce large residual curvature. To solve these disadvantages, the upper and lower rollers are usually adjusted separately. This structural solution is widely used for the straightening of medium-thick plates.
