基于摩擦轮反馈的数字液压缸系统

Digital Hydraulic Cylinder System Based on Friction Wheel Feedback

提出了一种柔性闭环反馈式数字液压缸系统。该系统采用一种基于摩擦轮柔性连接方式进行反馈控制,通过步进脉冲信号驱动阀芯轴向移动,打开进出油口,推动活塞杆移动,并带动摩擦轮转动,通过与摩擦轮相连接锥齿轮传动将活塞杆运动传递给反馈螺母,进而控制阀芯反向移动,闭合进出油口。该系统通过阀芯的轴向移动距离来控制液压缸的输入流量及活塞杆行程;通过摩擦轮直径大小和对活塞杆正压力以及锥齿轮模数来控制反馈系统的灵敏度和反馈精度;通过摩擦传动避免刚性连接件的机械冲击,减缓构件机械磨损及污染油液,从而提高系统可靠性,并对数字液压缸系统建立数学模型,推导传递函数,运用AMESim仿真软件分析系统的可行性、稳定性以及在不同情况下的动态特性。

A digital hydraulic actuator with flexible closed-loop position feedback system was designed,which adopted friction wheel to control the system.The stepper motor received the digital pulse signal,and drived the valve core to move axially,then the oil inlet and outlet was opend to drived the piston rod to move,which drived the friction wheel to rotate,and controlled the oil inlet and outlet to drive the valve core to move reversely by transmitting the movement of the piston rod to the feedback nut by connecting the bevel gear with the friction wheel,then the oil inlet and outlet was closed.The flow of the digital gap could be controlled by changing the length of the valve core;the sensitivity and precision of the control feedback system could be controlled by the diameter of the friction wheel,the positive pressure between the piston rod and the friction wheel and the modulus of the bevel gear;the reliability of the system could be improved by friction transmission,which could avoid the mechanical impact of rigid connectors to slow down the mechanical wear of components and pollute the oil.The theoretical model of the digital hydraulic cylinder system was constructed,and then the feasibility,stability and dynamic characteristics of the system under different conditions were analyzed by using AMESim simulation software.