上面的滚轴，下面的滚轴。
W12 series rolling machine with four rollers adopt upper roller rotary mechanical drive, lower roller and side roller fluctuation hydraulic drive, electric concentrated control operation system.
W12系列四辊卷板机采用上辊旋转机械传动，下辊和侧辊升降液压传动，电气集中控制操作系统。
The utility model can realize the gradual straightening operation and the straightening strain is very small. The upper roller and the lower roller can automatically conduct the centering operation.
本实用新型能实现渐进矫直，矫直应变极小，并且上、下辊能自行对中。
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