液压运输车制动平衡阀先导液阻网络研究

为了降低液压运输车在复杂工程路面行驶过程中出现时候的速度异常波动,利用半桥液阻网络对马达进口压力与平衡阀先导压力进行分离,调节平衡阀开启的实际先导比。针对平衡阀先导压力进行稳定控制,提高了行走马达流量稳定性。应用流体力学理论,建立平衡阀动态数学模型并进行系统仿真分析。分析结果表明:应用半桥液阻网络能够有效减小先导压力波动,使平衡阀阀芯位移相对稳定,当阻尼孔A与阻尼孔B直径同为0.6 mm时,行走马达流量平稳性提高了71.6%。

Study on Pilot Liquid Resistance Network of Brake Balance Valve for Hydraulic Transport Vehicles

In order to reduce the abnormal speed fluctuation of the hydraulic transport vehicle during the complicated engineering road driving, the D-type half-bridge liquid resistance network is used to separate the motor inlet pressure and the balance valve pilot pressure, and adjusts the actual pilot ratio of the balancing valve opening is adjusted.The pilot pressure was stably controlled to improve the flow stability of the traveling motor.Applying the theory of fluid mechanics, the dynamic mathematical model of the balancing valve was established and the system simulation analysis was carried out.The analysis results show that the application of D type half bridge liquid resistance network can effectively reduce the pilot pressure fluctuation and make the balance valve spool displacement relatively stable.When the diameters of the orifice A and the orifice B both are 0.6 mm, the stability of the flow rate of the traveling motor is increased by 71.6%.