| 摘要 |
PURPOSE:To prevent breakage of a plate within a looper during a loop position is varied by driving a roll near to an entrace side of a looping roll group corresponding to speed difference of the enterance and the discharge sides of the looper. CONSTITUTION:In a process line of a steel strip, from a speed Ve of the entrance side and a speed Vd of the discharge side of the steel strip mutually suspended over the looping roll groups 1, 3-n, the speed difference between the entrance and the discharge sides is calculated. Each looping rolls 1-n are driven by separate motors or separate differential gears at each peripheral speeds corresponding to the speed difference between the entrance and the discharge sides. Thereby, when stopped rapidly, accidents such as the breakage of the plate are avoided and, because the tension variation due to the variation of the loop position during acceleration and deceleration is controlled to a small level, stable operation of the line is insured. |
