| Mining technology and equipment directly related to production capacity and safety of coal mines in our country, which is rich in coal resources. Mechanical excavator has increasingly become an integral part of the coal mining equipment, and therefore, the structure analysis of the important parts of the excavator is quite necessary. Mining excavator’s working device, including bucket, stick and boom, is main stressed part which complete the excavation and load of ore. Bucket usually withstands impulsive load while stick and boom frequent withstand bending moment and torque. Once the damage occurs, it will directly impact on the excavator machine. Indeed, damage often appears on excavator working device while working. For example, rack wearing of stick, fracture of bucket tooth and so on, which seriously impact the ability and efficiency of the excavator. For this reason, it is necessary to do research on precise analysis and design of excavator working device. As structure and working condition of working device are complicated and if each structural improvement needs re-established finite element model, loading, analysis, it would be quite tedious work. Therefore, a general analysis program designed for the excavator working device in hazardous conditions is essential.This paper mainly studies on the WK-75large mining excavators working device which is independently developed by Taiyuan Heavy Industry Co., Ltd., A general structure analysis platform is designed in certain conditions with ANSYS parametric design language based on Visual C++6.0integrated development environment and working device UG parameterized model. Then embed the platform into UG software interface, completing the automatic analysis for working device.The parametric model is established in UG, and the structure of variable size data stored in text form. Then write the analysis program and the simplified model, related to the size and location of the variable names in the text are expressed via APDL language. When analysis performs, Visual C++6.0will write data to a text file which serves as the ANSYS input file. Then the program can find the certain position via the data and apply load and solve. In this paper, the location when the working device hazardous is simulated, furthermore, a friendly interface is design. In the specific analysis, two kinds of analysis method are designed, foreground and background mode, which can meet the needs of different designers. When the analysis complete, the results can be checked in general postprocessor in foreground mode or via the interface in background mode. The results show that the stress where the stick rack pinion and the gear engage is high while other region is low. As a result, the working device is in safe condition on the whole. In this paper, the specific analysis program is designed for the working device in certain condition which will avoid the complexity of the operation and improve efficiency to some extent. The analysis result is proved to be correct, the results more credible through the comparison with the CAE centre of the Taiyuan Heavy Industry Co., Ltd..The design of the analysis platform is also proved the efficiency and feasibility of integrated CAD and CAE analysis. The realization of this analysis platform, provides an effective way for structural analysis and design of excavator’s other components, establishes the foundation for the structural design and analysis of whole machine and will also improve the efficiency and quality of large excavator design. |
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