Design and experiment of pneumatic seed clearing mechanism for pin-hole tube wheat plot precision sowing device

IF 2.2 2区农林科学 Q2 AGRICULTURAL ENGINEERING

International Journal of Agricultural and Biological Engineering Pub Date : 2023-01-01 DOI:10.25165/j.ijabe.20231604.8006

Xirui Zhang, Youming Yang, Qingjie Wang, Hongwen Li, Zhifu Zhang, Junxiao Liu

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引用次数: 0

Abstract

For the problem that when wheat is sucked up by the air suction method, the seeds are gathered in a small area, making it difficult for the contact seed cleaning mechanism to clean the seeds. The mechanism of seed cleaning airflow on wheat seed was studied, the flow velocity distribution relationship of the jet section was defined, the mathematical model of the jet velocity of circular and plane sections was established, and the key factors that could have a significant influence on seed cleaning effect were explored. A non-contact positive pressure air flow seed cleaning method was proposed. After theoretical calculations, it is concluded that the core section lengths of the circular section jet and the inline jet are 24.8 mm and 28.8 mm, respectively. The clearing distance is set to 20 mm. Through the single-factor test, the best air tube nozzle shape was clarified as a vertical inline nozzle. The angle of seed cleaning, the air velocity of seed cleaning, and the negative supply pressure were selected as influencing factors, and the seed leakage index, seed reabsorption index, and seed qualification index as the evaluation indicators to conduct a 3-factor 5-horizontal rotation test. A mathematical regression model of influencing factors and evaluation indexes was established to analyze the influence of these factors and indexes. The optimal operation parameters were obtained as the seed cleaning Angle of 19°, the seed cleaning air velocity of 58 m/s, and the negative pressure of 8.5 kPa. Under the optimal parameters, the seed leakage suction index is 8.23%, the seed reabsorption index is 0.33%, and the seed qualification index is 91.44%, which meets the design requirements. Keywords: wheat, precision seed-metering device, clearing, seed, positive pressure airflow, jet flow field DOI: 10.25165/j.ijabe.20231604.8006 Citation: Zhang X R, Yang Y M, Wang Q J, Li H W, Zhang Z F, Liu J X. Design and experiment of pneumatic seed clearing mechanism for pin-hole tube wheat plot precision sowing device. Int J Agric & Biol Eng, 2023; 16(4): 85-95

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针孔管式麦田精密播种机气动清种机构设计与试验

针对小麦采用空气吸收法吸收时，种子聚集面积小，接触式清种机构难以对种子进行清种的问题。研究了清种气流对小麦种子的作用机理，定义了射流截面的流速分布关系，建立了圆截面和平面截面射流速度的数学模型，探讨了影响清种效果的关键因素。提出了一种非接触式正压气流种子清洗方法。经理论计算得出，圆截面射流的芯段长度为24.8 mm，直列射流的芯段长度为28.8 mm。清除距离设置为20mm。通过单因素试验，确定了气管喷嘴的最佳形状为垂直直管喷嘴。选取清种角度、清种风速、负压为影响因素，以种子泄漏指数、种子重吸收指数、种子合格指数为评价指标，进行3因素5水平旋转试验。建立了影响因素和评价指标的数学回归模型，分析了影响因素和评价指标的影响。得到最佳操作参数为洗种角19°，洗种风速58 m/s，负压8.5 kPa。在最优参数下，种子泄漏吸力指数为8.23%，种子重吸收指数为0.33%，种子合格指数为91.44%，满足设计要求。关键词:小麦，精密排种器，清场，种子，正压气流，射流场[DOI: 10.25165/ j.j ijabj .20231604.8006]引用本文:张晓荣，杨玉明，王庆军，李红伟，张志峰，刘建新。针孔管式小麦小区精密播种器气动清种机构设计与试验农业与生物工程学报，2023;16 (4): 85 - 95

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来源期刊

International Journal of Agricultural and Biological Engineering AGRICULTURAL ENGINEERING-

CiteScore

4.30

自引率

12.50%

发文量

审稿时长

24 weeks

期刊介绍： International Journal of Agricultural and Biological Engineering (IJABE, https://www.ijabe.org) is a peer reviewed open access international journal. IJABE, started in 2008, is a joint publication co-sponsored by US-based Association of Agricultural, Biological and Food Engineers (AOCABFE) and China-based Chinese Society of Agricultural Engineering (CSAE). The ISSN 1934-6344 and eISSN 1934-6352 numbers for both print and online IJABE have been registered in US. Now, Int. J. Agric. & Biol. Eng (IJABE) is published in both online and print version by Chinese Academy of Agricultural Engineering.