Abstract
<p>The paper presents the results of experimental researches on the working process and his efficiency for a sieve with external conical surface with alternative periodic motion. The sieve is suspended at the top and bottom with three elastic threads (of silk), with thread diameter f1.5<em> </em>mm and is provided with circular apertures of f4.2<em> </em>mm. Vibratory motion was obtained with an eccentric mechanism, placed horizontally and acting on tangential direction to the sieve at adjustable distance. . Was thus obtained amplitude oscillation of 3.58, 3.74, 3.91 and 4.10 mm. The oscillation frequencies used were 250, 520 and 790 osc/min. The sieve was used for sorting of canola seeds having sizes between f1.25 mm and f2.5 mm, in percent of 95 %.</p><p>It was found that seeds are separated closer to the feeding point of sieve the more so as the oscillation frequency is smaller. Seeds of a size less than 1.5 mm is separated close to the axis of rotation. Also, the sieve orifices can properly calibrate a seeds mix for all oscillation frequencies analyzed.</p>
Highlights
Based on the data in the table and the determinations performed, were plotted the distribution curves of material on conical sieve generatrix
In order for a granular mixture can be sifted and sorted into fractions using sieves is required to exist a state of sifting of the material, so that is a relative movement between the particles and the separation surface
In another order of ideas for the particles may be sieved, two conditions must be met: first, the particles must reach on the aperture, which is achieved by the relative movement of these on the separation surface and, second, particles have sufficient time to be involved in passing through apertures [1,2,3,4,5]
Summary
Based on the data in the table and the determinations performed, were plotted the distribution curves of material on conical sieve generatrix (according to the number of seeds collected under the sieve and beyond the edge thereof). In order for a granular mixture can be sifted and sorted into fractions using sieves is required to exist a state of sifting of the material, so that is a relative movement between the particles and the separation surface. In another order of ideas for the particles may be sieved, two conditions must be met: first, the particles must reach on the aperture, which is achieved by the relative movement of these on the separation surface and, second, particles have sufficient time to be involved in passing through apertures [1,2,3,4,5]. Sifting and sorting on sieve requires relative movement of the material particles on the separation surface, which is performed either by a corresponding inclination of the sieves, either by the oscillation movement of the sieve blocks [3]. Separation surfaces can be realized in the form of metal or textile braids or in the form of perforated sheets with apertures, ordinarily, elongated or circular
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