Design and Performance Test of Rotary Grate Concave Threshing and Separating Unit of Head-Feeding Combine Harvester

Author:

Zhang Zhengzhong,Xie Fangping,Tian Liquan,Liu Zhenghuai,Looh George Ashwehmbom,Wang Xiushan

Abstract

HighlightsThis research was aimed at assessing the performance of a head-feeding combine harvester.The rotary grate concave threshing and separating unit were effective for improving and preventing the threshing cylinder from being jammed and improving working efficiency.More broken grains were obtained at a faster speed of concave grate.The speed of feeding chain was significant on the performance parameters that were evaluated.Abstract. It is easy for the threshing cylinder to get blocked in the head-feeding combine harvester with the fixed grate concave threshing and separating unit to affect the working efficiency when high yield rice is harvested. The rotary grate concave threshing and separating unit was designed to solve the above problem. The rotary grate concave surface revolved in the same direction along the cylinder arc of threshing drum. A test-bench of the rotary grate concave threshing and separating unit was developed. The rotational speeds of cylinder (RC), the speed of the concave grate (SG), and the speed of feeding chain (SF) were regarded as experimental factors, and the grain loss rate, broken grain rate, and impurities rate were selected as indices. Central composite design combined with response surface methodology and multi-objective optimization method were employed to conduct experiments and explore the interaction effects of factors on indices. The optimal operating parameters were nonlinearly optimized and determined to be RC of 547.6 rpm, SG of 0.93 m·s-1, and SF of 1.06 m·s-1. Under these conditions, the predicted values of the grain loss rate, broken grain rate, and impurities rate were 1.95%, 0.29%, and 0.58%, respectively. Verification experiments indicated that the observed values were in agreement with the predicted values. Results suggested that the rotary grate concave threshing and separating unit developed in this study were effective for preventing the threshing drum from being blocked, and there was a good potential for performance improvement of head-feeding combine harvester. Keywords: Central composite design, Cylinder speed, Feeding chain speed, Head-feeding combine harvester, Response surface methodology, Rotary grate concave, Threshing and separating unit.

Publisher

American Society of Agricultural and Biological Engineers (ASABE)

Subject

General Engineering

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3