Authors

Abstract

To address the issues of high grain impurity rate and low cleaning efficiency in the cyclone separation cleaning system of small wheat combine harvesters in hilly and mountainous areas, this study proposes an internally screened cyclone separation cleaning system. Using the CFD-DEM coupled simulation method, the effect of the screen structure on the motion trajectory and separation behavior of the threshed material was systematically analyzed. A response surface methodology was applied to analyze the impact of interaction factors on cleaning performance. The optimal working parameters were determined to be: fan speed of 4020 r/min, scraper shaft speed of 340 r/min, clearance between the screen and the chamber wall of 37mm, and mesh size of 29 mm. Under these parameters, the simulation results showed a grain impurity rate of 2.99% and a cleaning loss rate of 1.10%, while the field experiment results were 3.08% and 1.14%, respectively. The field experiment results indicate that the designed cleaning system improved the cleaning performance and operational efficiency of the small combine harvester, providing both theoretical support and engineering guidance for the optimized design of cleaning system in small combine harvesters for hilly regions.

Abstract in Chinese

针对丘陵山区小型联合收获机旋风分离清选系统小麦清选时籽粒含杂率高、清选效率低等问题，本文提出一种内置筛网式旋风分离清选系统。采用CFD-DEM耦合仿真方法，系统分析筛网结构对脱出物运动轨迹及分离规律的影响。并采用响应面试验方法，分析了各交互因素对清选性能的影响，得出优化工作参数组合为：风机转速4020 r/min、刮板转轴转速340 r/min、筛网到筒壁间隙37 mm、网格间距29 mm。在此参数组合下，仿真结果显示籽粒含杂率为2.99%，清选损失率为1.10%；田间试验为籽粒含杂率3.08%，清选损失率1.14%。田间试验结果表明，所设计清选系统提高了小型联合收获机的清选性能与作业效率，为丘陵山区小型联合收获机清选系统的优化设计提供了理论依据与工程指导。