智能化农业装备学报（中英文）2025，Vol.6Issue(3)：67-75,9.DOI:10.12398/j.issn.2096-7217.2025.03.007
联合收获机卸粮堆积角形成规律与影响因素分析
Formation mechanism and influencing factors of grain pile angle during unloading in combine harvesters
摘要
Abstract
The piling behavior of grain particles during the unloading process directly affects the efficiency of the combine harvester's unloading system and the continuity of subsequent operations.As a key parameter reflecting unloading uniformity and spatial utilization,the angle of repose(piling angle)has not yet been systematically studied in terms of its formation mechanism and influencing factors.To investigate the formation mechanism and variation characteristics of the piling angle during grain unloading,this study focuses on three representative cereal crops:wheat,maize,and soybean.Discrete Element Method(DEM)models of the grain particles were developed based on the measured three-dimensional dimensions and physical properties of the seeds.Using SolidWorks and EDEM 2024,particle modeling and simulation settings were completed.The unloading process was simulated using the Hertz-Mindlin(no-slip)contact model,considering the effects of gravity,particle collisions,and the orientation of the unloading auger on the particle motion and piling behavior.Simulation experiments were conducted by varying three factors:unloading height,auger rotational speed,and auger inclination angle.To validate the accuracy of the simulation models,cylinder lifting and slope sliding experiments were performed.The results demonstrated a high degree of agreement between the simulated and actual particle pile profiles,confirming the reliability of the modeling approach.Finally,a grain unloading and accumulation simulation experiment was conducted.The results showed that appropriately increasing the unloading height and auger speed,combined with the implementation of a high-position unloading mode,effectively reduced the pile angle and expanded the grain coverage area.This approach helps to prevent excessive localized accumulation of crop grains during the unloading process.The findings provide a theoretical basis for the structural optimization and parameter matching of combine harvester unloading systems,support the adaptive unloading planning of unloading augers,and offer insights for the precise control of unmanned cooperative grain unloading systems.关键词
农业机械/离散元法/联合收获机/卸粮/堆积角Key words
agricultural machinery/discrete element method(DEM)/combine harvester/grain unloading/angle of repose分类
农业科技引用本文复制引用
魏文波,张鹏程,孙小彦,王文彬,郭沛琦,朱烨均,肖茂华..联合收获机卸粮堆积角形成规律与影响因素分析[J].智能化农业装备学报（中英文）,2025,6(3):67-75,9.基金项目
国家重点研发计划项目(2022YFD2001604) （2022YFD2001604）
江苏省研究生科研与实践创新计划项目(KYCX25_1035) National Key Research and Development Program of China(2022YFD2001604) （KYCX25_1035）
the Postgraduate Research and Practice Innovation Program of Jiangsu Province under Grant(KYCX25_1035) （KYCX25_1035）
