Authors

Abstract

This research aims to solve the problem of material accumulation on the screen surface of the cleaning device of tracked combine harvester and proposes an innovative solution of designing a pre-screening device based on the traditional cleaning device. The problem of material accumulation on the screen surface is improved, which in turn enhances the cleaning efficiency. In this study, CFD-DEM coupled simulation technology is used to simulate and analyse the cleaning device, and the effects of airflow velocity, vibration frequency and amplitude on the cleaning effect are explored, and the impurity content and loss rate are used as evaluation indexes. Through orthogonal experimental analysis, the optimal parameter combination of the cleaning device was determined as airflow velocity 11 m/s, vibration frequency 9 Hz, amplitude 30 mm, impurity content rate 2.10% and loss rate 1.62%. The experimental results show that increasing the pre-screening device can significantly improve the material separation effect, reduce the loss and improve the cleaning efficiency.

Abstract in Chinese

本研究旨在解决履带式联合收获机清选装置的筛面物料堆积问题，提出了在传统清选装置基础上设计预筛装置的创新方案。改善了物料在筛面上的堆积问题，进而提升清选效率。本研究采用CFD-DEM耦合仿真技术，对清选装置进行模拟分析，探讨了风速、振频、振幅对清选效果的影响，并以含杂率和损失率作为评价指标。通过正交实验分析，确定了清选装置的最优参数组合为风速11 m/s，振频9Hz，振幅30mm。含杂率为2.10%，损失率为1.62%。实验结果表明，增加预筛装置能够显著改善物料分离效果，减少损失，提高清选效率。