采用PLC和直流调速装置的矫直机自控系统改造

The Reformation of Automatic Control System of Straightener by Using PLC and DC Speed Regulator

本文描述了无缝钢管矫直机控制系统的设计和实现方法。该系统采用PLC来实现矫直机的逻辑控制,同时采用西门子直流调速装置6RA70实现矫直机的速度控制。通过安装在矫直机主传动电机轴上的绝对值偏码器,检测该电机的转速值并将其反馈到直流调速装置,实现了矫直机速度的闭环控制,以满足生产工艺的要求。

The methods of design and implementation of the straightenercontrol system for seamless steel tube are described in this paper. The PLC is used for realizing the straightener＇s logic control. Meanwhile the Siemens DC speed regulator 6RA70 is adopted for realizing the straightener＇s speed control in the system. By means of the absolute encoder which is installed on the axis of the straightener＇s main driving motor, the rotation speed value of the motor is detected and it is fed back to the DC speed regulator to achieve the closed- loop speed control for the straightener. Thus the requirements of the production technology can be satisfied.