基于压下力控制模型的带钢平整分卷机组液压控制系统自动化改造

Hydraulic force control automation system of transformation strip leveling unit based on pressure control model

针对热轧带钢平整后板材出现横折和浪形缺陷等问题,对原平整机组液压压下系统的控制原理进行了研究,对控制系统各组成部分的主要功能和控制方式等方面进行了分析,找到了板材质量问题的关键因素。提出了平整分卷机组液压控制系统进行自动化改造的方法,将原继电控制方式改为西门子PLC运算控制方式,分析了基于压下力控制模型的建模方法,介绍了液压控制系统中压下控制系统、液压弯辊控制、恒压力控制、跟随控制、调零控制等5个方面的功能。PLC逻辑控制的设计,弥补了以前依靠简单的图表和现场操作人员的经验方法来设置轧制组工艺参数的预设值的不足。研究结果表明,控制系统改造后,提高了系统控制精度,改善了板材的板形和表面质量,达到了平整机组液压控制系统自动化改造的目的。

In view of the problem of horizontal and wave shape defects of hot rolled strip after formation. The control principle of the hydraulic pressure system of the hydraulic press was studied,The main function of the control system and the control method was analyzed,The key factor in the quality of the plate was found. The method of automation of hydraulic control system of leveling unit was proposed,The original relay control mode was transformed into SIEMENS PLC operation control mode,The modeling method based on the pressure control model was analyzed,The functions of five aspects,such as the pressure control system of the hydraulic control system,the control of the hydraulic bending roll,the constant pressure control,the following control and the zero control were introduced. PLC logic control was designed,which used to rely on simple charts and field operation personnel to set up the method to set the parameters of the rolling set of the backward means of the design has been changed. The results indicate that the control system reform and improve the system control precision,improve the plate shape and surface quality of the strip,to temper mill hydraulic control system automation.