基于S7-400 PLC的造纸机直接张力控制

为提高造纸机运行的稳定性,防止纸幅断裂现象,从分析纸幅张力检测的原理及方法出发,设计了基于SIMATIC S7-400 PLC的造纸机张力控制系统.详细介绍了该控制系统的结构、硬件配置及其控制功能的软件实现.将该控制系统应用于造纸机压光部的实践证明,该系统采用的速度控制+张力控制方式调节各传动点之间的速度链关系及纸幅张力,较好地实现了纸机张力控制功能,取得了满意的控制效果.

Direct Strain Control of Paper Machine Based on S7 - 400 PLC

In order to enhance the stability of paper machine and to prevent paper's break, the strain con-trol system based on SIMATIC S7 -400 PLC for paper machine was designed from analyzing the principle and method of strain measure beginning. The structure, hardware configuration and the software achievement of control function in the strain control system were presented in details. The results of this control system ap-plied in planishing part of paper machine proved that this control system which adapted the method of combina-tion of speed control and strain control to adjust the speed ratio of transmission points as well as paper's strain has fulfilled the strain control function very well and achieved the satisfactory control result.