300MN模锻水压机操纵系统改造方案研究

300MN模锻水压机原有操纵系统操作不便,控制精度低,响应速度慢,可靠性低。针对其机械本体特征及运行要求,改操作系统控制方式“水控水”为“油控水”方式,改操纵系统为数字电液伺服控制系统。新增加一油压系统,由操作手柄、按钮发出控制信号,通过PLC控制油压系统驱动执行油缸,实现分配器阀的正确动作;检测凸轮驱动机构的实际位置,反馈给控制系统,实现闭环控制,以实现对水压机的工作过程快速、精确、可靠控制。

Research on the Reform Program of a 300 MN Die-forging Hydrostatic Press Control System

The original control system of a 300 MN die-forging hydrostatic press has inconvenience for operation,low control accuracy,slow response speed and low reliability.Following the characteristics and operation requirements of the press′ machine body,the paper puts forward the following reform programs:(1).the water-control-water mode is changed into the oil-control-water mode;(2).the control system is changed into a digital electro-hydraulic servo-control system.A new oil hydrostatic system is added so that its control handles and buttons may send control signals and direct the oil hydrostatic system to drive its executive oil cylinder so as to accomplish the correct actions of distributors′ valves.The real positions of its cam mechanism are detected and fed back to the control system,achieving its close-loop control.This realizes the rapid,accurate and reliable control of the working processes of the hydrostatic press.