Airflow ejection-wrapped clamping type seedling picking method and parameter optimization.
Airflow ejection-wrapped clamping type seedling picking method and parameter optimization.
复制标题
气流弹射裹夹式取苗方法及参数优化
DOI：
10.3389/fpls.2022.1084563
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发表时间：
2022
影响因子：
5.6
通讯作者：
中科院分区：
文献类型：
--
作者：
针对目前夹持式和推出式取苗方法对苗木造成损伤的问题，提出了一种气流喷射-包裹夹持式取苗方法，利用气流喷射出苗木，包裹夹持苗木，以减少取苗过程中对苗木的损伤。通过理论设计建立了参数模型，通过耦合仿真分析对参数进行了优化，并通过实验验证了参数的有效性。结果表明，气流喷嘴直径选择为3.5mm，与穴盘排水口相匹配;根据气体射流动力学原理，计算出喷苗所需气流压力为0.146MPa ~ 0.315MPa。在Comsol中对气流弹射进行流固耦合模拟，提出气流压力等于或大于0.4 Mpa时，秧苗才能弹射出来，气流维持0.3 s左右，保证弹射出来的秧苗姿态，才能更好地夹持秧苗。采用Fluent-Edem耦合方法对气流弹射过程进行了流体-离散体模拟，结果表明：气流压力为0.5MPa时，秧苗会受到损伤，因此在弹射过程中气流压力应设定为0.4MPa。此外，还设计了与气流引射方式相匹配的柔性包裹式夹持器，实现了全方位夹持秧苗，RecurDyn-Edem耦合仿真表明，夹持片与垂直方向夹角为8.5°时，末端夹持器能够牢固夹持秧苗而不损伤秧苗。最后，研制了气流引射包裹夹持式取苗装置，并进行了验证试验，验证了仿真结果。该研究可为自动取苗技术提供一定的参考。
Since the current clamp-type and push-out-type seedling picking method brought damage to seedlings, this study aimed to proposed an airflow ejection-wrapped clamping type seedling picking method, which used airflow to eject out seedling and the seedlings were wrapped clamped to reduce the damage of seedlings during seedling picking process. The parameter model was established through theoretical design, then the parameters were optimized through coupling simulation analysis, and the validity of these parameters was verified through experiments. We found that the diameter of the airflow nozzle was selected as 3.5 mm to match with the drainage outlet of the plug tray, and the airflow pressure which could eject out seedlings was calculated as 0.146 Mpa~0.315 Mpa on the basis of gas jet dynamic. The fluid-solid coupling simulation of airflow ejection in Comsol proposed that the seedlings could be ejected out under the airflow pressure was equal to or greater than 0.4 Mpa, and the airflow should be maintained for about 0.3 s to ensure the posture of the seedlings ejected out for better seedling clamping. The further fluid-discrete body simulation of airflow ejection by using Fluent-Edem coupling method indicated that the seedling was damaged under airflow pressure of 0.5 MPa, so the airflow pressure should be set as 0.4 MPa during seedling ejection process. Besides, a wrapped clamping type effector which clamped the seedlings from all sides in the form of flexible package was also designed to match with the airflow ejection method, and the RecurDyn-Edem coupling simulation showed that the end-effector could tightly clamp the seedling without damage when the angle between the clamping slices and the vertical direction was 8.5°. Finally, the airflow ejection-wrapped clamping type seedling picking device was manufactured, and the verification tests verified the simulation results. This research can provide some references for the automatic seedling picking technology.
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影响因子：
0.9
作者：
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通讯作者：
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影响因子：
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作者：
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作者：
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DOI：
10.25165/j.ijabe.20201304.5695
发表时间：
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影响因子：
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作者：
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通讯作者：
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