双张紧辊组配置下连退机组清洗段的张力控制模式探讨

A discussion on a tension control model in the CAPL clean section with two sets of bridle rolls

某新建连退机组清洗段采用的是双张紧辊组配置方式,其中1号张紧辊位于清洗段入口,作为速度主控制辊;2号张紧辊位于清洗段出口,用于清洗段张力控制(张力计在清洗段入口);其他辅助辊子(沉没辊、转向辊)也采用速度控制。在此控制方式下,出现过张力控制不稳定,2号张紧辊过载及带钢跑偏的问题。针对某连退机组的清洗段出现的这些问题,提出对张力控制的建议,主要是:在设计上尽量减少张力计与2号张紧辊之间的距离,同时辅助辊参与张力调节,提高控制快速性;平衡清洗段各辊子电机负荷,以降低辊子磨损和跑偏,防止2号张紧辊电机过负载。

The new CAPL clean section has two sets of bridle rolls.The No.1 bride roll is located at the entry of the clean section used as the speed master roll.The No.2 bridle roll is located at the exit of the clean section used as the tension control（a tension meter at the entry of the clean section）.The other rolls,such as sink roll,deflector roll,etc.are also under the speed control.With this control model,some bad things would happen,such as unstable tension control,the No.2 bridle roll＇s over load,strip deviation,etc.In order to solve these problems,the paper gives some suggestions,including to shorten the distance between the tension meter and the No.2 bridle roll at the design stage;to make the auxiliary rolls join the tension control（ATR）so as to increase ATR＇s respond speed;to balance the rolls＇ motor load in the clean section,so as to decrease rolls＇ abrasion and strip deviation,preventing the No.2 bridle roll from over load.