十进制编码电液数字阀的流量特性分析OA

The electro-hydraulic digital valve has the merits of good linearity and high reliability,which is the fundamental component in hydraulic digital control.To solve the problems that binary-coded valve groups require a large number of on/off valves,and that high-speed on/off valves have small flow rates and large impact,a decimal-coded electro-hydraulic digital flow valve is proposed,whose output flow rates follow a natural number sequence proportional relationship.Compared with binary-coded valve groups,given the same number of on/off valves,this valve achieves a wider flow regulation range and higher precision.Compared with high-speed on/off valves,it controls a larger flow rate with a smaller impact.The structure and working principle of the decimal-coded electro-hydraulic digital valve are first introduced,followed by the establishment of its static flow characteristic model.Combining the stepper motor model and the electromagnet dynamic model,a corresponding Simulink simulation model is constructed.Finally,the actual flow characteristics are obtained through experiments.The results show that at a supply pressure of 3 MPa,the output flow range of the designed valve is 0～19.3733 L/min,with a resolution of approximately 0.1294 L/min.The flow rate exhibits a linear relationship with the input signal with a smaller hysteresis.Under rated output,the step response time is less than 0.07 s,and the theoretical values obtained from the model agree well with the experimental values.