| Scraper conveyor is one of the important components of intelligentized equipments in comprehensive mechanized coal mining forefield. Central groove is the body and material bearing mechanism of scraper conveyor. Its performance directly affects the conveyor capacity of scraper conveyor and stability and the stability and reliability of the whole machine work, and then has a great influence on the efficiency of coal transportation. Compared with other parts in the scraper conveyor, the central groove has a much more complicated modeling process, and different types of central groove has a large difference in the form. Typical working conditions of central groove divide into support-pushing,support-pulling and so on. During the operation,the force and stress on central groove is much complex. The main failure forms are excessive wear and fracture. Therefore, in the entire three machine auxiliary devices, the central groove is the component that has larger usage amount and consumption. Given all that, it is necessary to carry though a systematic parametric design and analysis of the central groove of scraper conveyor.Based on the central groove of SGZ764/400 mining scraper conveyor, in ANSYS environment, set the key dimensions of central groove into a variable by using the APDL parametric design language directly. According to the characteristics of difference between different types of central groove structure, the central groove is parameterized by using the modular modeling method and taking the way of command stream inputting. By this way, the function of fastly establish the corresponding central groove model can be realized by changing the dimension parameters.According to the dimension parameters of central groove, a finite element model of the middle groove is established, and the mesh generation unit length, material property parameters and load parameters are parameterized, the parametric static analysis of central groove is completed under two typical conditions of support-pushing and support-pulling. Achieved the function of fleetly build finite element modeling, analysis and solution by changing finite element parameters. By means of contrastive analysis of stress nephogram, the stress concentration parts of the central groove under push forwards the conveyer and driving the powered support are obtained, which lays the foundation for the fatigue analysis of central groove.On the basis of the static analysis of central groove, by using the Fatigue Tool module of ANSYS Workbench software, the analysis of fatigue life for central groove can be completed. It analyses the fatigue life nephogram, fatigue safety factor nephogram and fatigue sensitivity curve graph, and obtains the parts where the middle groove is most prone to fatigue failure. Thus provides the basis for the optimization design of central groove.Based on the basic theory and method of topology optimization, it carries out the topology optimization analysis of the central groove in two typical conditions.According to the topology optimization analysis results and the application of the central groove in the actual working conditions, the structure of the central groove is optimized,then the static analysis and fatigue analysis of optimization of middle groove are carried out. The results show that the improved central groove cut out two part materials of the bottom, reduces the weight of the central groove and save the materials,at the same time, in accordance with the requirements of strength and fatigue life, and in the actual working environment of the central trough is more convenient to clean the bottom of the cinder.Finally, under the VC++ platform, the ANSYS command stream of parametric modeling and static analysis of central groove are encapsulated in the background. And a system of parametric modeling and analysis system for central groove is developed to realize the complete process of modeling and analysis, effectively improve the modeling and analysis efficiency of central groove. |
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