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多維并聯(lián)振動篩篩分過程解析與篩面運動形式優(yōu)選
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國家自然科學基金項目(51405039,、51375062)


Screening Process Analysis for Multi-dimensional Parallel Vibrating Screen and Optimization of Screen Surface Movement
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    摘要:

    針對物料在多維并聯(lián)振動篩篩面上的運動過程及其規(guī)律不明確,,以及采用何種篩面運動形式最佳的問題,,研究了物料顆粒在多維振動篩篩面上的運動過程,,并提出最佳的篩面運動形式。引入分散度與分層速率2個指標,,基于顆粒離散單元法(DEM)研究各單自由度振動對篩面上物料分散和分層過程的影響,,優(yōu)選出分散度和分層速率較優(yōu)的4個單自由度振動,即:分別沿篩面長度,、寬度和高度方向的移動x,、y和z,以及繞篩面法線方向的轉(zhuǎn)動γ,,其中,,x和y單自由度振動效果尤為明顯。在優(yōu)選振動自由度組成的各種振動形式下,,基于篩分效率和含雜率,,對多維振動篩面的物料透篩過程進行模擬研究,表明:3平移1轉(zhuǎn)動(3T-1R)四維振動形式透篩性最好,,為理想的篩面運動,。據(jù)此設(shè)計了一種3T-1R并聯(lián)機構(gòu),并在樣機上進行了篩分試驗驗證,。

    Abstract:

    Coworkers and authors have put forward the concept of multidimensional parallel vibrating screen, and made prototype design and experimental analysis. However, the movement process of materials on the multidimensional vibrating screen and the problems of ideal sieve surface movement have not been solved yet. In this paper, the material movement process and the ideal screen surface movement of the multidimensional parallel vibrating screen were studied. First of all, two important indexes were imported, including the dispersion degree and layering rate, and the effect of six single degree of freedom (DOF) vibrations of screen surface on the material dispersion and layering process based on discrete element method (DEM) were analyzed, so the four single degree of freedom vibrations of screen surface were optimized which were more conducive to the material dispersion and layering process, that was three translations x, y, and z along the length, width and height of screen surface respectively, and a rotation γ around the normal of screen surface. Among them, the effects of the x and y single degree of freedom vibrations of screen surface were particularly obvious. Then according to screening efficiency and impurity rate, screening process of material on the multidimensional vibration sieve was simulated based on various vibration movement forms consisted of the four single degree of freedom vibrations selected. The results showed that three translational and one rotational 4DOF vibration form xyzγ had the best screen permeability, which was selected as the ideal screen surface movement form. Finally, according to the ideal screen surface movement, a 3T-1R parallel mechanism was designed, the prototype was developed, and the screening test was carried out on the prototype. The work of this paper provided a solid theoretical basis for the design of the multidimensional parallel vibrating screen and the selection of the optimum screening parameters.

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李菊,曾氫菲,鄧嘉鳴,沈惠平,熊坤.多維并聯(lián)振動篩篩分過程解析與篩面運動形式優(yōu)選[J].農(nóng)業(yè)機械學報,2016,47(11):399-407. Li Ju, Zeng Qingfei, Deng Jiaming, Shen Huiping, Xiong Kun. Screening Process Analysis for Multi-dimensional Parallel Vibrating Screen and Optimization of Screen Surface Movement[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(11):399-407.

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  • 收稿日期:2016-07-21
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  • 在線發(fā)布日期: 2016-11-10
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