DISCRETE ELEMENT ANALYSIS OF THE CORN THRESHING AND SEPARATION PROCESS

玉米籽粒脱粒分离过程离散元分析

DOI : https://doi.org/10.35633/inmateh-78-07

Authors

Liquan YANG

1. Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan 467033, China; 2. College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Kun ZHAO

Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University

Guangyu YIN

Pingdingshan Company, Henan Tobacco Company, Pingdingshan 467033, China

Qianglong SU

Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan 467033, China

Xiaodong LIU

Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan 467033, China

(*) Qingqing LÜ

Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan 467033, China

Zhe QU

College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Hongmei ZHANG

College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Erbo LIU

Henan Province Engineering Research Center of Ultrasonic Technology Application, Pingdingshan University, Pingdingshan 467033, China

(*) Corresponding authors:

2696@pdsu.edu.cn |

Qingqing LÜ

Abstract

This study focuses on the threshing device of a cross-axial flow drum and establishes a discrete element method (DEM) model to simulate the separation process of corn kernels within the device. The model reveals the motion behavior of corn kernels under different drum rotational speeds, feeding rates, and threshing gaps, as well as their spatial distribution along the axial direction of the drum. An orthogonal experimental design was employed to investigate the effects of various threshing parameters on the grain retention rate inside the device. The results indicate that drum rotational speed has the most significant influence on grain retention, followed by the feeding rate and the threshing gap. These findings provide an important theoretical basis for optimizing the threshing performance and improving the operational efficiency of the device. The optimal parameter combination was determined as follows: drum speed of 572.96 r/min, feeding rate of 1.5 kg/s, and threshing gap of 36 mm, which minimizes grain retention and ensures optimal operational performance.

Abstract in Chinese

以一种横轴流滚筒玉米脱粒机中的脱粒装置为研究对象，通过建立离散元模型来模拟玉米籽粒在脱粒装置中的分离过程，揭示了不同滚筒转速、籽粒喂入量、脱粒间隙下玉米籽粒的运动规律及玉米籽粒沿滚筒轴向的分布情况。通过正交试验揭示了不同脱粒条件对脱粒装置内部籽粒滞留率的影响，结果表明滚筒转速对籽粒滞留率的影响最大，其次是籽粒喂入量，最后是脱粒间隙。这对于优化脱粒装置的性能和提高其工作效率具有重要意义。最终确定的最优参数为：滚筒转速572.96 r/min、籽粒喂入量1.5 kg/s、脱粒间隙36 mm，可以达到脱粒装置内最低的籽粒滞留率，从而实现最佳的作业效果。

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