| As one of the most commonly used modern engineering equipment in modern engineering construction, hydraulic excavator plays a huge role in promoting the national economy construction. The working device is the major execution module of the hydraulic excavator action. As the excavator will be affected by the load variation under harsh conditions during the mining process, higher requirements are put forward on the rationality of the device structure, convenience of operation, durability and reliability. They will also affect the working performance and the service life. The reliability, the durability and the fatigue life of working device must meet the requirements of the working environment, and they are the key factors in the reasonable structure design.Based on actual working environment of working device in a hydraulic excavator’s working process, the force analysis model of working device under the extreme condition were established and the theoretical calculation of boom, dipper stick and the whole working device were carried on. Thus the extreme load of working device under working condition was got. Then the three-dimensional solid model of working device was built with the APDL parametric language in ANSYS and the stress and strain distribution was analyzed under the extreme load. Through the theoretical analysis and simulation, the weaknesses of the working device were found out, and a structure optimization design was conducted. According to the stress of dangerous area dangerous points, the simulation and analysis on the fatigue life of the working device were carried out. The simulation results showed that the optimized structure design of working device can meet the job requirements.The theoretical findings of this thesis has already been applied to the design and production of actual hydraulic excavator models, which proved that it can provide an important guidance to the design of hydraulic excavator. |
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