设计了PLC控制液压伺服系统来实现数控落地铣镗床主轴箱动态平衡的控制。在此液压系统中，应用电液伺服阀和伺服控制系统来控制活塞杆的压力和位移，实现对主轴箱因倾斜而产生误差的补偿。这样不仅可以提高机床加工精度，而且可以改善立柱的受力-design of PLC controlled hydraulic servo system to achieve CNC Milling-landing spindle box dynamic control. In this hydraulic system, the application of electro-hydraulic servo valves and servo control system to control the pressure and the piston rod displacement, realize right by tilting spindle box and error compensation. This will not only improve the machining precision, but also improve the force Column