Research on Loading Way of Multi-way Valve Acceleration Life Testing of Excavators
To accurately measure the reliable life of the multi-way valve of the backhoe hydraulic excavator,two reliability accelerated life estimation test methods for the normal operation of the multi-way valve were proposed based on the measured load data of the excavator during excavation operation as well as the Archard wear equation.Taking the 20 t backhoe hydraulic excavator as the research object,the load data under the typical operating conditions of the hydraulic excavator are first collected,and 100 groups of typical excavation operation cycle data are extracted from the load data according to the pressure characteristics of the multi-way valve port during the operation of the excavator.To measure the reliable life of the normal operation of the multi-way valve in a short time,two accelerated life test methods of synchronous loading and simulated loading were proposed,where synchronous loading is the A/B port plugging,the rated flow rate of the main relief valve is input,and it is kept constant.In the process of continuous reversing,the rated pressure of the main relief valve is used to load the pressure of the multi-way valve,and the steady-state time of the valve core back to the median position is obtained by AMESim simulation and the pressure holding time of each valve port is determined by factors such as material deformation.Simulated loading means that each valve port is loaded following the action sequence of each valve port when the excavator performs a 90° rotation operation.Finally,the acceleration multipliers of the two acceleration tests are calculated using the Archard wear equation and combined with the actual working conditions of the multi-way valves.It concludes that the acceleration multipliers of synchronous loading are larger,while the simulated loading is closer to the actual working cycle.
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