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Topic

Technologies and technical equipment for agriculture and food industry

Volume

Volume 65 / No. 3 / 2021

Pages : 333-344

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DESIGN AND EXPERIMENTAL STUDY OF FLEXIBLE THRESHING UNIT FOR CHINESE CABBAGE SEEDS

大白菜种子柔性脱粒装置设计与试验

DOI : https://doi.org/10.35633/inmateh-65-35

Authors

(*) Shengsheng Wang

Henan University of Science and Technology

Pan Chen

Henan University of Science and Technology

Jiangtao Ji

Henan University of Science and Technology

Mengqing Lu

Henan University of Science and Technology

(*) Corresponding authors:

[email protected] |

Shengsheng Wang

Abstract

In order to solve the problems of low efficiency of artificial harvesting method and high breakage rate and undepurated rate of traditional threshing method, a new flexible threshing device of Chinese cabbage seeds was designed, which was composed of flexible round head nail teeth and circular tube concave plate. Hertz contact collision theory was used to analyze and determine the structural parameters of the new threshing unit. The interaction force of different threshing elements materials were analyzed by using EDEM. The feasibility of the flexible threshing unit was verified by the comparison test of the distribution of threshed mixture. Finally, the orthogonal test was carried out to study the influence of the movement parameters of each structure on the cleaning rate and the rate of undepurated, and the weight matrix method was used to optimize it. The results indicate that under the condition the rotating speed of the threshing cylinder 750 rpm, the concave clearance 20 mm, and the feeding rate 1.4 kg/s, the threshing performance of the flexible threshing unit was the best. At this time, the breaking rate was 0.064%, and the un-threshing rate was 0.67%, which both met the relevant industry standards.

Abstract in Chinese

针对大白菜种子人工收获方式效率低、传统脱粒方式存在破碎率及未脱净率较高的问题,设计了一种新型的柔性圆头钉齿和圆管凹板组合的大白菜种子柔性脱粒装置。采用Hertz接触碰撞理论确定了柔性圆头钉齿及圆管凹板的结构参数,采用离散元仿真软件EDEM对比分析了不同脱粒元件及凹板与物料接触时的受力情况,结合脱出物分布对比试验结果进一步验证了该柔性脱粒装置的可行性。最后以滚筒转速、脱粒间隙及喂入量为试验因素,以种子破碎率、未脱净率为试验指标,开展正交试验,采用权矩阵法优化得到了该脱粒装置的最佳工作参数组合。结果表明:当脱粒滚筒转速为750r/min,脱粒间隙为20mm,喂入量为1.4kg/s时,该柔性脱粒装置的脱粒性能达到最佳,此时破碎率为0.064%,未脱净率为0.67%,满足国家相关行业标准。

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