Research On Strength Analysis And Flow Channel Optimization Of Integral Multi-way Valve In Hydraulic Excavator

Due to its compact, connected and simple advantage, Multi-way the versatile integrated Multi-way valve has been widely applied on the engineering machinery, especially on the hydraulic excavator. To solve the problems such as unreasonable design of flow channels in the multi-way valve and the failure of valve body, an overall research of multi-way valve was conducted by using flow field simulation and using the finite element method on the basis of design and research method of existing valves. The main research contents are as follows:The main geometric parameters was obtained by calculating the structure size of multi-way valve, combining with the principle of hydraulic systems. In order to obtain the flow area of the orifice, the formula was derived by different throttle valve opening slot area, and at the same time the program was conducted by MATLAB to calculate the flow area, thus laid the foundation for the pressure loss in the flow channel. In order to ensure the high performance of the valve, the leakage between body and spool was calculated as the same to flow force and clamping force, which laid a foundation for the flow field analysis and structure analysis.The flow channel field simulation was built by ANSYS Workbench, the pressure loss was analyzed in flow channel of specific conditions. In order to optimize the pressure loss of flow channel, the influence of related parameters on the flow pressure loss of the channel was analyzed by using parametric optimization design method. The results reveals that the height and inlet size has a greater impact on the pressure loss and the effects has optimized significantly.In order to obtain the stress and deformation of the valve body, the strength analysis was established by ANSYS. The lifetime of multi-way valve body was predicted by using the finite life prediction method and the influence of fatigue safety factor and related parameters was studied.The integral multi-way valve performance was tested based on the experimental platform. The test items as well as their realization were analyzed in details, and related tests of the valve were conducted. The test results are analyzed combining with the functional principle and structural characteristics that can provide experimental support for the simulation.