The operation efficiency of the reversing valve has significant influence on the stability of the excavator hydraulic system.In order to solve the problem of low frequency width of traditional electro-hydraulic servo vibration excitation valves,a cartridge type hydraulic control system combining a pilot valve and a two-way cartridge valve is designed,and the vibration frequency evaluation model is established.Simulation analysis and experimental verification results show that a relatively stable reversing stroke can be obtained when the throttle aperture is maintained at 5 mm.With the change of the diameter of the throttle hole,the excitation frequency also changes accordingly.When the area ratio is reduced,the quality of the valve core also increases,resulting in a decrease in the reversing frequency.When the system working pressure is gradually increased or the diameter of the throttle hole is increased,the reversing frequency is also increased.It can be seen that the appropriate system pressure and throttle hole diameter are selected to realize control of the excitation frequency.The experiment verifies the accuracy of the simulation,and lower excitation frequency is obtained during the experiment,which is caused by the influence of oil inertia.The research is helpful to improve the energy saving efficiency of excavators.
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