Research on Static and Dynamic Characteristics of Digital Proportional Valve for Coal Mine Underground Drilling Rig
In response to the problem of insufficient development of characteristics in the application of digital proportional valves in the electro-hydraulic system of coal mine underground drilling rigs,starting from the principle of digital proportional valves,a mathematical model was constructed to explain the coupling relationship between the pilot stage and the main valve.It was found that the pilot flow rate was a key indicator that determines the static and dynamic characteristics of the main valve.A AMESim model for a digital proportional valve was established,and simulation results showed that when the PWM signal frequency of the digital proportional valve was controlled at 20 Hz,the linear control range of the duty cycle flow rate was 0.2～0.8,and the output flow fluctuation amplitude of the main valve was 3.16 L/min.The static and dynamic characteristics of the digital proportional valve performed well.After adjusting the PWM signal frequency,the digital proportional valve was applied to the feed circuit of the drilling rig.After testing experiments,the displacement error of the drilling rig controlled by the digital proportional valve in the feed circuit was increased from 2.8％to 1.9％compared to the traditional valve controlled loop.
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