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Influence of Oscillation Frequency of a Sieve on the Screening Process for a Conical Sieve with oscillatory circular motion

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Journal of Agricultural Science and Technology(B) 2011年第8期1卷 1224-1231页

作者： Gh. Voicu D. Stoica N. Ungureanu Faculty of Biotechnical Systems Engineering ＂Politehniea＂ University of Bucharest Splaiul Independentei 313 Bucharest 060042Romania

Removal of foreign bodies from seed mixtures, or their calibration for use as planting material, as well as fraction classification of granular materials requires screening surfaces with vibratory motion. This paper presents some aspects on the working process of a sieve, made of perforated sheet and having an outer conical surface with oscillatory circular motion （alternative） on the horizontal. Results are presented for some experimental researches on the movement of material on the sieve, for various kinematical parameters of the sieve （amplitude and oscillation frequency）. A conical sieve, suspended at the upper and lower in three points, was tested for screening of rapeseeds in order to estimate the influence of oscillation frequency on the screening process. Curves were drawn for separation intensity on the sieve generating line, and by regression analysis with normal distribution law were determined the equation coefficients and the correlation with experimental data. Movement of material on the sieve and its working process, in general, was appreciated by means of the peak position of distribution curve depending on the oscillation frequency of the sieve, considering that the normal distribution law correlates very well the data obtained by experiments.

关键词： Grain sieving conical sieve oscillatory circular motion oscillation frequency normal distribution law.

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