Authors

Abstract

To investigate the distribution characteristics of the threshed mixture, threshing and separation experiments were conducted using a self-developed longitudinal axial-flow threshing device with adjustable threshing force, with the adjustable threshing force plates set to the closed mode. The variation patterns of the threshed mixture, grains, stalks, and light impurities along both the axial and radial directions of the threshing drum were obtained experimentally. Based on the experimental data, distribution models of the threshed and separated mixture along the axial and radial directions of the drum were established. The results show that the mass of the threshed mixture beneath the drum accounts for 91.99% of the total feed rate, while the discharged material at the drum outlet accounts for 8.01%. Within the threshed mixture beneath the drum, wheat grains, stalks, and light impurities account for 61.48%, 26.22%, and 12.30% of the total mass, respectively. Based on these findings, the structure of the threshing device was optimized. In the axial range of 1020 ~ 1700 mm along the threshing drum, the grain crushing rate was reduced from 1.16 ~ 12.5% to 1.05 ~ 7.5%. These results provide a theoretical basis and technical reference for the structural design and parameter optimization of threshing, separation, and cleaning systems, contributing to reduced energy consumption and improved operational performance.

Abstract in Chinese

为了研究脱出物的分布规律，在自行研制的脱粒力度可调式纵轴流脱粒装置上进行了脱粒力度调节板处于关闭状态下的脱粒分离试验。通过试验获得脱出物总体、籽粒、茎秆及轻质杂余沿滚筒轴向和径向的变化规律。通过分析获得脱出物沿滚筒轴向和径向的分布规律方程。试验结果表明，滚筒下方脱出物的质量占总喂入量的91.99%，滚筒尾部排出物的质量占总喂入量的8.01%。在滚筒下方的脱出物中，籽粒、茎秆及轻质杂余分别占脱出物总质量的61.48%、26.22%、12.3%。基于试验结果对脱粒装置进行了结构优化，在脱粒滚筒轴向距离1020mm ~ 1700mm范围内，籽粒破碎率从1.16% ~ 12.5%降为1.05% ~ 7.5%。该试验结果可为脱粒、分离及清选装置的结构设计和参数优化提供参考和依据，从而降低脱粒、分离及清选能耗，提高作业质量。