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基于DEM-CFD的氣吸式三七種苗定向移栽裝置研究
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國(guó)家自然科學(xué)基金項(xiàng)目（31960366）,、國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2017YFD0700600-2017YFD0700604）,、云南省重大科技專項(xiàng)（2016ZF001、2017ZF001,、2018ZC001-3,、2018ZC001-4、2018ZC001-5）和云南省高校工程研究中心建設(shè)計(jì)劃項(xiàng)目


Design and Test of Air Suction Directional Transplanting Device for Panax notoginseng Seedlings Based on DEM-CFD Coupling
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    摘要:

    為實(shí)現(xiàn)機(jī)械化移栽,、解決三七種苗調(diào)姿定向問(wèn)題,，設(shè)計(jì)了一種振動(dòng)輔助吸苗氣吸式三七種苗定向移栽裝置。通過(guò)分析種苗的吸附狀態(tài)受力及種苗在升力作用下產(chǎn)生旋轉(zhuǎn)力矩,、實(shí)現(xiàn)調(diào)姿的過(guò)程,，闡明了種苗吸附調(diào)姿的機(jī)理；利用DEM-CFD氣固兩相流耦合仿真方法對(duì)種苗吸附調(diào)姿過(guò)程進(jìn)行分析,，驗(yàn)證了種苗吸附調(diào)姿的可行性,，仿真結(jié)果表明，當(dāng)主吸孔與輔助定位吸孔夾角為23°,、與調(diào)姿轉(zhuǎn)向吸孔夾角為30°時(shí),，種苗因受到壓力差而產(chǎn)生的升力能使其調(diào)姿并定位,。為優(yōu)化移栽裝置的工作性能，以主吸孔負(fù)壓,、動(dòng)吸盤轉(zhuǎn)速和調(diào)姿轉(zhuǎn)向吸孔直徑為試驗(yàn)因素,，以定向合格指數(shù)和漏吸指數(shù)為試驗(yàn)指標(biāo)，進(jìn)行了二次回歸正交旋轉(zhuǎn)組合臺(tái)架試驗(yàn),。試驗(yàn)表明,，影響定向合格指數(shù)的主次順序?yàn)檎{(diào)姿轉(zhuǎn)向吸孔直徑、主吸孔負(fù)壓,、動(dòng)吸盤轉(zhuǎn)速,，當(dāng)調(diào)姿轉(zhuǎn)向吸孔直徑為4.5mm、主吸孔負(fù)壓為1.03～2.11kPa,、動(dòng)吸盤轉(zhuǎn)速為4.67～6.08r/min時(shí),，定向移栽裝置平均定向合格指數(shù)為85.87%、平均漏吸指數(shù)為6.33%,，可滿足三七種苗移栽要求,。

    Abstract:

    In order to solve the orientation problem of Panax notoginseng seedling and realize mechanized transplanting, air suction directional transplanting device of Panax notoginseng seedling assisted by vibration was designed. The mechanism of seedling adsorption posture adjustment was clarified based on the stress analysis of adsorption state of seedlings and the process under the action of lifting force, the seedlings generated rotation torque to realize posture adjustment. The process of seedling adsorption attitude adjustment was analyzed and the feasibility of posture adjustment was verified by seedling adsorption through DEM-CFD gas solid two phase flow coupling simulation. And the results showed that when the angle between the main suction hole and the auxiliary positioning suction hole was 23° and the angle between the attitude adjustment and steering suction hole was 30°, the posture of those seedlings can be adjusted and positioned by the raising force produced by the pressure difference on them. To test the performance of directional transplanting device, the quadratic regression orthogonal rotary combination bench tests were carried out, with the negative pressure value of main suction hole, rotating speed of dynamic sucker and diameter of suction hole for attitude adjustment and steering as experimental factors, the directional qualified index and missing planting index as indicators. As the results shown, factors arranged in important order were as follows: diameter of suction hole for attitude adjustment and steering, rotating speed of dynamic sucker, negative pressure value of main suction hole. The diameter of suction hole for attitude adjustment and steering was 4.5mm, the negative pressure of main suction hole was 1.03～2.11kPa, the rotating speed of the dynamic sucker was 4.67～6.08r/min, the directional qualification index was 85.87%, the missing planting index was 6.33%, which satisfied the needs of transplanting of Panax notoginseng.

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賴慶輝,趙瑾汶,蘇微,賈廣鑫,李俊宏,呂勤.基于DEM-CFD的氣吸式三七種苗定向移栽裝置研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2021,52(7):60-70. LAI Qinghui, ZHAO Jinwen, SU Wei, JIA Guangxin, LI Junhong, Lü Qin. Design and Test of Air Suction Directional Transplanting Device for Panax notoginseng Seedlings Based on DEM-CFD Coupling[J]. Transactions of the Chinese Society for Agricultural Machinery,2021,52(7):60-70.

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  • 收稿日期:2021-03-02
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  • 在線發(fā)布日期: 2021-07-10
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