Authors

Abstract

To investigate the movement characteristics and distribution patterns of materials inside the threshing drum during the rapeseed threshing process, a simplified DEM model was established using three typical particle types: seeds, pods, and stalks. A simulation system of the drum's internal environment was constructed, and combined with high-speed photography experiments to analyse the material distribution and dynamic movement trajectories. The results showed that materials primarily migrated in a helical pattern along the outer edge of the drum. Seeds and pods were mainly concentrated in collection box 2, accounting for 33.6% and 27.6% of the total, respectively. The material quantity gradually decreased from collection boxes 2 to 6, while 56.5% of the partially unbroken stalks were discharged from the straw outlet and collected in box 7. To verify the accuracy of the simulation, a test platform was built and high-speed photography experiments were conducted, showing that the actual material trajectories closely matched the simulation. Both simulation and experimental results indicated the highest material concentration in collection box 2, at 24.6% and 19.2%, respectively, and the lowest in box 6, at 5.1% and 6.8%. These findings provide theoretical support and technical guidance for optimizing drum structure, achieving precise threshing control, and advancing intelligent agricultural machinery design.

Abstract in Chinese

为研究油菜籽脱粒过程中脱粒滚筒内部物料的迁移特征和分布规律，建立了籽粒、果荚和茎秆三种典型颗粒简化的DEM模型。建立了脱粒滚筒内部环境模拟系统，并结合高速摄影实验对物料分布和动态迁移轨迹进行了分析。结果表明，物料主要沿滚筒外缘呈螺旋状迁移。种子和豆荚主要集中在 2 号收集箱，分别占总量的 33.6% 和 27.6%。从 2 号收集箱到 6 号收集箱，物料量逐渐减少，56.5% 的部分未破碎茎秆从秸秆出口排出，被收集到 7 号收集箱。为了验证模拟的准确性，我们搭建了一个测试平台，并进行了高速摄影实验，结果表明实际的物料轨迹与模拟非常吻合。模拟和实验结果都表明，2 号收集箱的物料浓度最高，分别为 24.6% 和 19.2%，6 号收集箱的物料浓度最低，分别为 5.1% 和 6.8%。这些发现为优化滚筒结构、实现精确脱粒控制和推进智能农机设计提供了理论支持和技术指导。