高速精量播种机阿基米德螺线型弧面双齿盘覆土装置设计与试验
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国家重点研发计划项目(2021YFD2000404、2021YFD2000405)


Design and Experiment of Archimedean Spiral-type Arc Double-toothed Disc Soil-covering Device for High-speed Precision Planter
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    摘要:

    针对现有重型精量播种机在高速作业时存在覆土装置影响播种均匀性、种沟内种子被“架空”等问题,基于阿基米德螺线切刃曲线与挤压式覆土原理相结合的思路,设计了一种阿基米德螺线型弧面双齿盘覆土装置,实现了覆土厚度适宜且均匀一致,降低覆土作业对播种均匀性影响的目的。本研究对覆土装置的结构参数、覆土量进行分析,确定了影响覆土效果的主要参数取值范围;利用EDEM离散元仿真技术建立了覆土装置-种子-土壤间的离散元模型,对关键参数进行仿真优化,确定弧面双齿盘的最优参数组合;通过田间试验对该装置的作业性能进行了验证。研究结果表明:影响弧面双齿盘作业性能的主要结构参数为阿基米德螺线型弧面双齿盘的中心间距、安装倾角、入土深度。当弧面双齿盘的中心间距为142.6mm、安装倾角为20°、入土深度为55mm时,该装置通过性能良好,覆土厚度均匀一致,平均厚度为47mm,合格粒距标准差、变异系数与空白对照组分别相差0.22mm、1.81个百分点,对播种均匀性影响小,满足精量播种的农艺要求。

    Abstract:

    Aiming at the existing heavy-duty precision planter soil-covering device at high speed, there are problems such as high impact on seed spacing uniformity, seed being overhead, etc., the proposed combination of Archimedean spiral-type and extruded soil cover technical ideas, an Archimedean spiral-type arc double-toothed disc soil-covering device was designed, to achieve suitable and uniform mulch thickness and reduce the impact of mulching operations on seed spacing uniformity. The structural parameters of the mulching device and the amount of mulch were analyzed, and the range of values of the main parameters affecting the effect of mulching was determined;the simulation and optimization analyses of the designed components were carried out by using EDEM software to determine the optimal parameter combinations of the arc double-toothed disc;and the operational performance of the device was verified through field experiments. The results showed that the main structural parameters affecting the operational performance of the arc double-toothed disc were the center distance, installation inclination, and embedded depth of the arc double-toothed disc. When the center distance of the arc double-toothed disc was 142.6mm, the installation inclination was 20°, and embedded depth was 55mm, the device passed well with suitable and uniform mulch thickness, the average mulch thickness was 47mm, and the standard deviation and coefficient of variation of qualified spacing differed from the blank control group by 0.22mm and 1.81 percentage points, which was a small influence on the uniformity of sowing and met the agronomic requirements of precision sowing.

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刘芳,高筱钧,贾宪,黄玉祥,张崇勤.高速精量播种机阿基米德螺线型弧面双齿盘覆土装置设计与试验[J].农业机械学报,2024,55(6):91-100,120. LIU Fang, GAO Xiaojun, JIA Xian, HUANG Yuxiang, ZHANG Chongqin. Design and Experiment of Archimedean Spiral-type Arc Double-toothed Disc Soil-covering Device for High-speed Precision Planter[J]. Transactions of the Chinese Society for Agricultural Machinery,2024,55(6):91-100,120.

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  • 收稿日期:2024-01-09
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  • 在线发布日期: 2024-06-10
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