关键词: 菠萝, 旋耕机刀辊, SolidWorks, 有限元, 模态分析

Abstract: The structure and strength of the knife roll, which is the core part of the pineapple belt trenching machine, are the important factors affecting the trenching effect and quality. Firstly, combined with the agronomic requirements of pineapple planting and agricultural machinery production indicators, the structural design of the knife roller of the pineapple ribbon rotary tillage trenching machine was carried out, and the modeling was carried out with SolidWorks2022. Secondly, the tool roll will be affected by complex factors such as environment and working conditions when it is working. The modal analysis of the tool roll model is carried out by ANSYS Workbench17 finite element analysis software, and the frequency distribution and vibration displacement of the first eight steps of the tool roll under constrained state are obtained. Finally, the maximum working speed of the cutter roller is taken as the factor and the vibration frequency is taken as the evaluation index. The results show that when the outer diameter of the shaft is 74mm, the inner diameter is 58mm, the row spacing is 500mm, and the groove width is 260mm, the first natural frequency of the tool roll modal analysis is 66.778Hz, which is far greater than the actual maximum operating frequency of the tool roll 16.25Hz, and it is confirmed that the structure of the rotary tiller tool roll meets the design requirements. The results of this study can reduce the failure rate of the cutter roller in practical application and production, which is of great significance for the development of agricultural production mechanization in pineapple cultivation.

Key words: pineapple, rotary tiller knife roll, SolidWorks, finite element, modal analysis