Authors

Abstract

Aiming at the problems of high crushing rate and severe loss of sesame capsules caused by mechanical collision in the conveying link of the header of the traditional sesame combine harvester, a low-damage screw conveying device has been optimized and designed. This study analyzed the operation mechanism of the low-damage screw conveyor based on the characteristics of the sesame capsule and determined the key parameters affecting the crushing rate of the sesame capsule, including diameter, pitch and rotational speed. Taking the crushing rate as the evaluation index and with the aid of EDEM discrete element simulation technology, the interaction model of sesame capsule - sesame stem - low-damage screw conveying device was constructed, and the single-factor and Box-Behnken response surface experimental designs were systematically carried out. Through simulation analysis and optimization, the optimal parameter combination of the low-damage screw conveyor device was determined: diameter 302 mm, pitch 422 mm, and rotational speed 200 r/min. Under these conditions, the crushing rate of sesame capsules can be reduced to less than 3%. This study provides a theoretical basis and technical reference for the structural optimization of the screw conveyor device of the sesame combine harvester and the reduction of the header loss rate.

Abstract in Chinese

针对传统芝麻联合收获机割台输送环节因机械碰撞导致的芝麻蒴果破碎率高、损失严重等问题，优化设计了一种低损伤螺旋输送装置。本研究基于芝麻蒴果特性分析了低损伤螺旋输送装置的作业机理，确定了影响芝麻蒴果破碎率的关键参数，包括直径、螺距和转速。以破碎率作为评价指标，借助EDEM离散元仿真技术，构建了芝麻蒴果-芝麻茎秆-低损伤螺旋输送装置的互作模型，系统开展了单因素和Box-Behnken响应面试验设计。通过仿真分析与优化，确定了低损伤螺旋输送装置的最优参数组合：直径302mm、螺距422mm、转速200r/min，此条件下，芝麻蒴果破碎率可降至3%以下。本研究为芝麻联合收获机螺旋输送装置的结构优化与割台损失率的降低提供了理论依据和技术参考