Authors

Abstract

To address grain breakage and high losses associated with elevated grain moisture during corn harvesting in hilly regions, this study analyzes the threshing process and proposes a flexible threshing device composed of flexible arc-shaped bar teeth and a round steel bar concave screen. Discrete element simulations using EDEM were conducted to evaluate the contact forces between corn ears and the flexible threshing device, in comparison with a conventional rigid device. The aim was to verify the performance of the proposed design. Field comparative tests were subsequently performed to assess the operational performance of both flexible and rigid threshing devices. The results show that, compared with the rigid device, the flexible device reduces kernel breakage by 3.25 percentage points and kernel loss by 2.88 percentage points. These findings provide a useful reference for the design and application of corn kernel harvesters in hilly regions.

Abstract in Chinese

针对丘陵地区玉米籽粒收获过程中籽粒含水率高导致籽粒破碎和损失大等问题。本文对脱粒过程进行力学分析，设计一种由“柔性弧面杆齿+圆钢栅条凹板筛”组成的柔性脱粒装置。通过EDEM软件对脱粒装置进行模拟仿真，探究柔性脱粒装置与传统刚性脱粒装置对玉米果穗接触力的数值大小，验证所设计的柔性脱粒装置性能。进行了柔性和刚性脱粒装置田间对比试验，试验结果表明：与传统刚性脱粒装置相比，籽粒破碎率下降了3.25个百分点，籽粒损失率下降了2.88个百分点，为丘陵地区玉米籽粒收获机提供了参考。