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5044108 
Journal Article 
Review of grain threshing theory and technology 
Fu, Jun; Chen, Zhi; Han, L; Ren, L 
2018 
Yes 
International Journal of Agricultural and Biological Engineering
ISSN: 1934-6352 
11 
3 
12-20 
WOS:000434341100002 
Threshing is the most important function of grain harvester. Grain loss and damage in harvesting are significantly related with threshing theory and technology. There are four kinds of threshing principles including impact, rubbing, combing and grinding. Four types of contact model between grain and threshing components have been constructed correspondently. Grain damage can be regarded as a function of peripheral velocity and contact pattern of impacting. Grain loss can be regarded as a function of contact pattern of rasp bars. Grain loss coming from cleaning and separation in the subsequent process of combing threshing was significantly decreased. Tangential and axial threshing technologies have been applied in grain threshing system widely. It showed that in the combined application, tangential rolls are used to accelerate grain flow, and axial rolls are used to increase threshing quality especially lower loss and damage. Conical concave may take the place of the traditional cylindrical one. With the development of sensor technology and communication technology, intelligent harvesting robot and automatic threshing system will be integrated together to improve grain quality and operation comfort. 
grain; threshing; harvester; grain loss; review 
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