Modeling and dynamic characteristics of multi-valve visualization machine-liquid system
ZHANG Liping1, XU Lei1*, WANG Xiajin2, HE Siqi1
1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610000, China; 2. Sichuan Changjiang Hydraulic Parts Limited Liability Company, Luzhou, Sichuan 646006, China
Abstract：To analyze the dynamic characteristics and optimize the parameter of LBF20 electro-hydraulic proportional load sensitive multi-way valve,the control principle and the flow distribution characte-ristics of this valve were analyzed. A new method for constructing a visualized machine-liquid integrated system model based on excavator with AMEsim software was proposed. To verify the correctness of the model, the distribution characteristics of flow were compared from simulation results and theoretical analysis. The effect of the spring pre-pressure of three-way flow valve,the diameter,the length and the cross-sectional shape of LS pipe on the dynamic characteristics of the system was stu-died by batch operation and control variables. The results show that the spring pre-pressure of the three-way flow valve should be set at 150-350 N.With the pre-pressure increasing, the flow rate entering the load, the pressure margin and the pump outlet pressure are increasing. When the diameter of LS pipe increases appropriately, the state of fluid is laminar, so the length and cross-sectional shape of the pipeline have little influence on the system. The modeling method can provide a reference for other multi-control valve system modeling, and the LBF20 multi-way valve model can be used for the further parameter optimization and dynamic characteristics research.
