活套是用来检测和调整相邻机架间的速度关系，实现无张力轧制的设备。主 PLC中设有活套调节器，活套调节器是根据检测的活套高度偏差，产生速度修 正信号，调整机架速度以维持活套高度（活套量）在给定值上不变，实现前后 机架速度秒流量平衡。活套的起落是通过起套辊，改变轧件的金属流动方向生 成的。使轧件在轧制过程中生成自由的弧形，保证轧制过程中无张力轧制。 起套辊伸出和收回信号来自轧件头尾跟踪信号。由于起套辊动作执行机构延 迟性，起套辊伸出信号要比预期到达的伸出位置，提前一个延迟时间。当轧 件尾端接近活套的前一机架时，开始收套，活套高度将按一定斜率下降为零， 以避免轧件甩尾，后起套辊收回。
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EXTREME NETWORKS BLACKDIAMOND 41511 G48T GIGABIT MODULE
