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一、问题的提出 近几年,我院曾先后设计了几台四重可逆和不可逆带材冷轧机的电控系统,张力变化范围分别为1:10以内或1:10以上。是用切换卷取机的减速机的传动比,还是用卷取机单双电机的切换,来满足工艺提出的最大张力和最小张力的要求呢?前者,不仅使机机设备结构复杂,操作麻烦,而且电控系统的设计也要适应传动比切换的要求,需设有相应改变传动比的单元和环节。后者,小张力时用一台电机,大张力时用二台电机工作,这也同样需要增加机械设备(如电磁离合器
First, the issue raised In recent years, our hospital has designed several sets of quadrupole reversible and irreversible strip cold rolling mill control system, the tension range of 1:10 or less than 1:10 or more. Is to use the switch winder reducer gear ratio, or coiler single double motor switch to meet the process proposed maximum tension and minimum tension requirements? The former, not only make the machine equipment structure is complex, the operation is troublesome , But also the design of electronic control system must also adapt to the transmission ratio switching requirements, there must be a corresponding change gear ratio unit and links. The latter, when a small tension with a motor, when the tension with two motors, which also need to increase mechanical equipment (such as electromagnetic clutch