液压挖掘机斗杆内收流量分配节能设计OA北大核心CSTPCD

In order to solve the problems of the slow arm retraction,the high system pressure and the overflow loss under the excavation conditions,an arm retraction energy-saving system is proposed.Under the excavation condition or positive load,the return oil of the arm retraction returns through the energy-saving valve.That is,the return oil area is increased when the stick retraction flow is not regenerated.The energy-saving system working principle and simulation parameters are given.Based on AMESim,the arm retraction energy-saving system simulation model is built.The characteristics of the stick retraction speed,pressure and flow of the system with and without the energy-saving valve are compared and simulated.The effect of the diameter of the energy-saving valve on the arm retraction dynamic characteristics is analyzed.The feasibility analysis of the system practical application is carried out.The simulation conclusion was verified through testing the entire excavator.The results show that:the energy-saving valve is introduced,the arm retraction speed increases by 18％,and the arm cylinder oil inlet pressure decreases by 65％;the energy-saving valve diameter has little influence on the output flow,total return oil flow and system pressure.According to the excavator,measurement,the arm rod internal retraction speed can be increased by 19％.