| 正负压式精量排种器设计与仿真优化 |
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| 引用本文： | 柏文杰,李颖,于华丽,赵达卫,李新领,赵晓顺.正负压式精量排种器设计与仿真优化[J].河北农业大学学报,2022,45(4):115-122. |
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| 作者姓名： | 柏文杰 李颖 于华丽 赵达卫 李新领 赵晓顺 |
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| 作者单位： | 1. 河北农业大学 机电工程学院，河北 保定 071001；2. 张家口市农机技术推广站，河北 张家口 075000 |
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| 基金项目： | 河北省重点研发计划项目（21327215D,19227208D）； 河北省引进留学人员资助项目（C20200337）； 河北省省级科技计划资助项目（20327401D） |
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| 摘 要： | 针对机械式排种器伤种率高、均匀性差以及气吸式排种器易堵塞等问题，设计了1种滚筒正负压式排种器，并基于有限元法与离散元法对滚筒正负压式排种器的排种性能进行分析，利用Fluent仿真软件分析了吸种负压值、种孔直径以及每排种孔数目等结构参数对排种器性能的影响，通过径向截面压力图以及速度矢量图的分析得到排种器较优结构参数：种孔直径为2.0 mm，每排种孔数为28个，以及吸种负压范围为-4.0～-2.5 kPa；利用EDEM-Fluent耦合方法对种子颗粒运动轨迹以及排种器转速对种孔的吸种性能的影响进行了仿真，仿真发现合格率随着转速的增大先增加后减少，重播率以及漏播率相反，最终确定排种器较优转速在19 r/min到27 r/min之间。本文的研究可为精量排种器的设计提供参考。
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| 关 键 词： | 气吸式 精量 排种器 Fluent EDEM 仿真分析 |
| 收稿时间： | 2021-08-05 |
Design and simulation optimization of positive and negative pressure seed-metering device |
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| BAI Wenjie,LI Ying,YU Huali,ZHAO Dawei,LI Xinling,ZHAO Xiaoshun.Design and simulation optimization of positive and negative pressure seed-metering device[J].Journal of Agricultural University of Hebei,2022,45(4):115-122. |
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| Authors: | BAI Wenjie LI Ying YU Huali ZHAO Dawei LI Xinling ZHAO Xiaoshun |
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| Institution: | 1.College of Mechanical and Electrical Engineering, Hebei Agricultural University, Baoding 071001, China;
2. Zhangjiakou Agricultural Machinery Technology Popularize Station, Zhangjiakou 075000, China |
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| Abstract: | In order to solve the problems of high injury rate and uneven distribution of mechanical seed-metering device, a kind of roller positive and negative pressure seed-metering device was designed, whose seed metering performance was analyzed using finite element and discrete element method. The Fluent software was applied to simulate the effects of structural parameters of the seed metering device such as suction negative pressure, seed hole diameter and the number of seed holes per row. The optimal structural parameters of the seed metering device were obtained through the analysis of the pressure diagram of radial section and the diagram of velocity vector. The parameters are as follows: The diameter of seed holes was 2.0 mm; The number of seed holes per row was 28; And the negative pressure range of seed suction was-4.0～2.5 kPa. The trajectory of seed particles was simulated by EDEM-Fluent coupling method, finding that the qualified rate first increased and then decreased as the rotational speed increased, whose trend was opposite with the multiple-seeding rate and the missing-seeding rate. Finally, the optimal rotational speed of the seed metering device was determined between 19 r/min and 27 r/min. This study provided a reference for the design of precision seed-metering device. |
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| Keywords: | air-suction precision seed-metering device Fluent EDEM simulation analysis |
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