切纵流联合收割机纵轴流滚筒长度设计与优化(英文)

Design and optimization for length of longitudinal-flow threshing cylinder of combine harvester

为优化设计切纵流联合收割机纵轴流滚筒的长度,该文通过设计脱粒分离长度可变的纵轴流滚筒并进行喂入量为7 kg/s的水稻脱粒分离性能和籽粒分布试验,分析纵轴流滚筒下脱出混合物的分布规律,建立纵轴流滚筒的籽粒分布方程,计算纵轴流滚筒长度;通过计算纵轴流滚筒顶盖导流板的最佳导角对纵轴流滚筒长度进行优化,确定纵轴流滚筒长度的最佳值并进行水稻脱粒分离性能试验。结果表明,在水稻喂入量为7 kg/s,纵轴流滚筒顶盖导流角为7.64°时,优化后的纵轴流滚筒长度最佳值为3 159.77 mm,经优化后的纵轴流滚筒脱粒分离的籽粒夹带损失率约为0.29%。该研究为纵轴流联合收割机的纵轴流滚筒设计提供了参考。

In order to optimize the length of longitudinal-flow threshing cylinder of combine harvester, in this paper the length-adjustable longitudinal-flow threshing cylinder was designed and used to conduct rice threshing and separating performance experiments. The grain distribution rules and distribution equation under the grid concave were developed. The length of longitudinal-flow threshing cylinder was optimized by calculating the optimal deflector helical angle of cylinder cover. The optimal length of the longitudinal-flow threshing cylinder was used to conduct rice threshing and separation performance confirmatory test. The result showed that when the feeding rate was 7 kg/s, adapted deflector helical angle of 7.64°, the optimal length of the longitudinal-flow threshing cylinder was 3 159.77 mm, and then the un-separated grain loss ratio could be controlled at the range from 0.2 % to 0.3%. The verification test result was about 0.29%. This study may provide a basis and method for design the length of longitudinal- flow threshing cylinder of combine harvester.