Design and Performance of a Kneading Threshing Device for Sorghum
In order to improve the quality of threshing and separating during sorghum combination harvest,a kneading axial flow threshing drum was designed.Through the interaction between the grain bar drum and the matched grid drum,the material was extruded,rubbed and flipped to realize the threshing and separation of sorghum seeds and reduce the loss rate and grain crushing rate.Using secondary universal rotating combination design,taking the grain crushing rate and entrainment loss rate as the main indexes,the experimental bench of the kneading type sorghum threshing device was tested taking the feeding amount,the drum speed of grain bar and the drum speed of grid as the influencing factors.The experimental results showed that the entrainment loss rate and crushing rate decreased first and then increased with the increase of feed.With the increase of drum speed,the crushing rate increases gradually,and the entrainment loss rate decreased first and then increased.When the grid cylinder was rotating positively,the breakage rate and entrainment loss rate decreased firstly and then increased with the increase of the rotating speed.When the grid drum was reversed,the breakage rate and entrainment loss rate both increased with the increase of rotational speed.The optimal solution was obtained under the constraint conditions through the regression equation,and the optimal parameter combination of the threshing device was obtained as follows:the feeding volume was 0.76 kg·s-1,the drum speed was 403 r·min-1,and the drum speed was 35 r·min-1.Under the optimal parameter combination,the grain crushing rate was 0.21%and the entrainment loss rate was 1.03%.The results provided a basis for the field test of the device.
sorghumrubbing typethreshing devicegrain breakage rateentrainment loss rate
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