| The levelof production and RecurDyn and design of large-scale mining excavators basically determines the development level of a country's open-pit mining infrastructure.“75m~3 large-scale mine excavator RecurDyn”is mainly undertaken by Taizhong,and it is an important project of“key technology for equipment manufacturing”in the“12th Five-Year”major science and technology project in Shanxi Province.Its birth marks the large-scale mine use in China.Excavator manufacturing technology has reached the world advanced level.As an important component of the excavator,the running frame will directly affect the working efficiency and output of the WK-75mining excavator.The fatigue life analysis of the running chassis can not only obtain the dangerous parts of the undercarriage under various operating conditions but also can obtain the service life of the dangerous parts,which has certain guiding significance for the safety of the production.The research on the fatigue life of the running chassis is based on the static strength analysis and verification of the running chassis and the rigid body dynamics simulation and analysis.This paper research the development history and development characteristics of large-scale mechanical excavators and forecasts the future development trends.The common methods for fatigue life analysis of components were analyzed and analyzed,and the advantages and disadvantages of various methods were summarized.According to the actual working conditions of the traveling chassis,the basic method of multi-axis high-cycle fatigue failure analysis is referenced,and the basic steps for the fatigue life analysis of the walking chassis are proposed.First of all,according to the relevant data provided too heavy,the establishment of a three-dimensional model of the walking chassis was completed through the UG.On the basis of previous studies,three typical working conditions in the process of walking undercarriage were proposed,and related researches were conducted on the undercarriage under these three conditions.Calculate the load and moment of the undercarriage under three conditions through theoretical calculations,and establish the ANSYS finite element analysis model.In the process of adding the load,the torque in the workbench cannot be directly added,and the torque is reduced to 48 couples.Add and finally perform stress and strain analysis on the three working conditions of the walking chassis.The next step is to analyze the dynamics of the running chassis and add suitable constraints to the ADAMS based on the actual conditions of the excavator.Then build a virtual prototype of the excavator in ADAMS.According to the actual work of the WK-75 excavator in the lifting and rotation speed,add the appropriate driving function,in ADAMS realize the dynamic simulation of the excavator under different working conditions.And the load spectrum of the undercarriage under different working conditions was extracted.Through comparative analysis of these load spectra,the hazardous working conditions of the undercarriage were obtained.Finally,combined with the load spectrum and the static simulation results of the walking chassis during excavator work,FE-SAFE software is used to complete the analysis of the life of the walking chassis.Finally,the analysis results are imported into ANSYS for post-processing and are respectively obtained.The number of stress cycles for the fatigue life of the walking frame under the operating conditions and the corresponding fatigue life is calculated.Through comparative analysis,the position with the least number of working cycles can be obtained,that is,the part with the shortest fatigue life and the fatigue life of this part can be obtained.The analysis of the fatigue life of the walking frame has a certain reference value for the safe and stable production of the WK-75 mine excavator. |
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