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ZHU Yongle, E-mail: 2017429651@qq.com
Outline
The conveying of grains is a critical process in the operation of combine harvesters, and the performance of this conveying system directly affects the overall operational efficiency of the harvester. However, traditional screw conveyors often suffer from low conveying efficiency during grain transport, which has become a bottleneck limiting the improvement of harvester performance. To address this issue, this study focuses on optimizing the structural parameters of key components in screw conveyors with the aim of enhancing their conveying performance. A novel discontinuous folded-edge structure was innovatively proposed. Based on the discrete element method (DEM) and orthogonal experiments design, folded-edge width B, axial folded-edge length Lx, and axial spacing between folded-edges Sx were systematically investigated with mass flow rate q as the performance evaluation indicator. The optimal combination of structural parameters was determined through range analysis. To verify the reliability of this optimization scheme, bench tests and high-speed photography were conducted to compare the conveying efficiency and material motion characteristics between the optimized design and the traditional screw conveyor. The research results indicate that, orthogonal simulation experiments identified the optimal parameter combination for the discontinuous folded-edge structure: B=5 mm, L=20 mm, S=0 mm. Bench tests confirmed the reliability of the optimized structure, demonstrating a 5.41% to 7.47% improvement in conveyance efficiency compared to the prototype. High-speed photography analysis further revealed that the discontinuous folded-edge structure effectively alters the flow state of particles, increasing the ratio of axial velocity to resultant velocity. This results in a higher axial conveying speed, enhances the axial transport of grain particles, and reduces energy loss. This study designed a screw conveyor with a discontinuous folded-edge structure, which improved the conveying performance of grain particles. The findings provide a solid theoretical basis and practical guidance for the structural optimization of screw conveyors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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