Authors

Abstract

To address issues such as clogging of threshing units, high grain loss rates, and elevated impurity levels in wheat breeding harvesters, this study developed a combing-type threshing and separation system for wheat plot harvesters. The system adopts a closed plate-tooth threshing drum structure, where the airflow generated by the rotation of drum blades is combined with external impurity-cleaning airflow, thereby reducing material accumulation and seed retention in the threshing and separation system. CFD-DEM coupling simulations determinethe optimal parameter combination: when the drum rotational speed is 891 r/min, the feeding rate is 0.58 kg/s, and the impurity-cleaning airflow speed is 22.56 m/s, the system achieves a loss rate of 0.87% and an impurity rate of 9.06%.A field performance test using this parameter combination showed that the system’s loss rate was 1.09% and impurity rate was 11.13%. This study provides a reference for the design and research of threshing and separation systems in comb-type wheat plot harvesters.

Abstract in English

为解决小麦育种收获机脱粒装置易堵塞，损失率与含杂率高等问题，本文设计了一种梳脱式小麦小区收获机脱分系统。采用闭式板齿脱粒滚筒结构方案，滚筒叶片旋转产生气流叠加外置清杂气流，有利于减少脱分系统内的物料堆积和存种。CFD-DEM耦合仿真得出最优参数组合：滚筒转速891r/min，脱分系统喂入量0.58kg/s，清杂气流风速22.56m/s时脱分系统损失率为0.87%，含杂率为9.06%。以此参数组合进行田间性能试验，得到脱分系统损失率为1.09%，含杂率为11.13%，试验样机脱分系统达到设计目标，本研究为梳脱式小麦小区收获机脱分系统设计研究提供了参考。