Finite Element Analysis And Structure Improvement Of Excavator Boom

Hydraulic excavator is a important construction engineering machinery, which is widely used in building industry, railway, water conservancy, the mining industry, national defense project, and urban construction and so on, which played a decisive role in the modern engineering construction. Working device is the main component of hydraulic excavator. It is very important to excavator performance, which is directly reflected by reasonable structure and flexible reliable and durable working process. Boom is the main working component of implement, which is very important to excavator’s life. The design of boom is much more crucial so that it must use advanced design method.The research object of this paper is a large hydraulic excavator’s boom. The excavator’s digging resistance, theory excavating force and pivot-point forces are calculated by theoretical analysis. A mathematical model for combined work condition is established. The ANSYS parametric design language(APDL) was used to build parametric finite element model for the hydraulic excavator based on the real geometric dimensioning. After assembly, the actual working conditions were used to apply boundary conditions for the finite element model so that static analysis of seven dangerous working conditions was carried out. The detailed information for both the stiffness and the strength could be obtained from the analysis results of finite element model. Next, completed live stress test of boom, verified the accuracy of the finite element model. Then the reason of the working device failure that generate in practical use had been found out according to the result of the analysis, then the structure of boom had been improved and perfected,and the analysis results are compared before and after the optimization. Sub-modeling technique was used to improve the structure of rib plate so that the reasonable position and structure was carried out.The methodology developed in this study can be used to provide useful guidance to the design of other cranes of the same or similar types.