Design and analysis of fatigue test bench for excavator working equipment with multiple test positions and load self-balancing function
Due to the fact that the existing fatigue test bench is only suitable for fatigue testing of a certain model of excavator boom and bucket,it results in low resource utilization and high testing costs.A self-balancing fatigue test bench suitable for various types of excavator working devices was designed.Firstly,the fatigue test was conducted on excavator working devices with a total weight of 6,8,20 t.Based on the design requirements and mechanical principles,the structural design of a multi-station self-balancing excavator working device fatigue test bench was completed.Secondly,based on the finite element theory,the structural strength and the stiffness analysis of the fatigue test bench under the ultimate load were carried out.Thirdly,based on the hot spot stress method and nominal stress method,fatigue life assessment was carried out on the welded joint structure,bolt group,and suspension rod,and the influecnce of preload on the fatigue life of the suspension rod was analyzed and studied.Finally,the fatigue test of 20 t excavator arm was performed.The results show that the fatigue test bench that designed can be used for fatigue testing loading of various types of excavator working devices,improving the universality of the fatigue test bench.The rationality and effectiveness of the design of the fatigue test bench have been verified.11 tabs,22 figs,27 refs.
mechanical engineeringexcavator working devicefatigue bench testfinite element analysisfatigue life
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