旋压机液压伺服系统位置压力复合控制研究

Position and Pressure Compound Control of Hydraulic Servo System of Spinning Machine

通过研究大直径薄壁管旋压机旋轮的压下控制,提出对液压系统采取位置闭环控制为主、压力闭环控制为辅的复合控制策略。液压缸与负载接触时,压力传感器将采集到的动态压力通过压力-位移转换模块反馈到系统的输入端,同时位移传感器的输出也作用于系统的输入端。首先建立了旋压机液压伺服系统位置-压力控制数学模型,然后利用AMESim软件进行仿真分析,验证该控制方式的可行性。结果表明:利用该控制方法不仅实现了压力、位置之间的实时测量、转换与调整,同时提高了大直径薄壁管旋压机液压伺服系统的响应速度、位置精度。

The reduction control of the rotary wheel of a large-diameter thin-walled tube spinning machine is studied,and a composite control method is proposed,which adopts a position closed-loop control as the main and a pressure closed-loop control for the hydraulic system.When the hydraulic cylinder is in contact with the load,the dynamic pressure is collected by the pressure sensor,and then fed back to the input end of the system through the pressure-displacement conversion module,and the displacement sensor also feeds back the displacement signal to the input end of the system.First,the mathematical model of the position and pressure control of the hydraulic servo system of the spinning machine is established.Then,AMESim software was used for simulation analysis to verify the feasibility of the control method.The results show that the control method not only realizes real-time measurement,conversion and adjustment between pressure and position,but also improves the response speed and position accuracy of the hydraulic servo system of the large-diameter thin-walled tube spinning machine.