The paper expounds a technological demand for the hydraulic excavator's center control valve manufacturing modular machine tool in a hydraulic excavator plant,introduces the application of PLC in the center control system of the machine tool,and the outer circuit diagram and ladder diagram are given.
阐述了某液压挖掘机制造厂的液压挖掘机中心控制阀加工中的三面二工位钻孔攻丝工序的工艺要求 ;介绍了PLC在用于该工序加工的组合机床控制系统改造中的应用 ;给出了外部接线图和梯形