高速开关阀先导控制电液换向阀特性研究

Research on the Characteristics of Pilot Controlled Electrohydraulic Directional Valve with High Speed On/Off Valve

针对现有液压支架使用乳化液传动介质电液换向阀存在流量控制不精准、压力冲击大、造成地下水污染等问题,提出使用水基高速开关阀先导控制电液换向阀,实现对主阀控制腔压力和主阀芯位移的精准控制。提出高速开关阀先导控制电液换向阀的液压桥路,针对先导高速开关阀提出复合PWM控制策略,将滞后时间缩短15.8 ms;提出脉频调制和脉宽调制占空比的方式控制主阀位移。仿真结果表明:在先导高速开关阀驱动信号一定占空比范围内主阀芯位移可以呈现比例开启效果。最后进行试验研究,试验结果证明高速开关阀作为先导级提升了主阀的响应速度。

Aiming at the problems of inaccurate flow control,large pressure impact and groundwater pollution of traditional hydraulic support using emulsion transmission medium electro-hydraulic reversing valve,a pilot proportional valve with water based high-speed switching valve was proposed,to achieve accurate control of the pressure of the main valve control chamber and the displacement of the main valve spool.A hydraulic bridge for pilot control of electro-hydraulic directional valve with high speed on-off valve was proposed.The compound PWM control strategy was proposed for pilot high speed on-off valve,reducing latency by 15.8 ms.The main valve displacement was controlled by pulse frequency modulation and pulse width modulation.The simulation results show that the displacement of main valve core can show proportional opening effect within a certain duty ratio range.The ultimate test findings indicate that using the high-speed on/off valve as a pilot stage enhances the response rate of the main valve.