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264 Emilian Moşneguţu et al. significant studies have been done by Brereton and Dymott in 1973, Rose and English in 1973, De Pretis in 1977 and Ferrara in 1988, studies which aim, in especially, to increase the efficiency of separation (Tsakalakis, 2001), (Sol<strong>din</strong>ger, 1999). However the separation of solid particles by size is not well known, in the specialty literature, have appeared three trends to study this process: i) experimental studies (Trumic, 2011); ii) theoretical studies (Sol<strong>din</strong>ger, 2002), (Li et al., 2003), (Stoicovici et al., 2008), (Szymański et al., 2003), (Xie, 2007); iii) studying the process through the simulation (Dong, 2009), (Zhao, 2010), (Jianzhang & Xin, 2012). From specialty literature study is established that the process separation of solid particles after their size depends on several factors (Tsakalakis, 2001): i) size and shape aperture sieve; ii) particle size and form; moisture particles undergo the process of separation; intensity of vibration, respectively frequency and amplitude; iii) quantity of material that is fed sieve; sieve length. These factors also influence the behavior of solid particle on to surface oscillating respectively its trajectory. 2. Materials and Equipment In the specialty literature there are very few experimental determinations which involving the use of real particles to determine the trajectory and speed of movement thereof on an oscillating surface. Therefore, the experimental determinations have performed using real particles, respectively particles of beans and using the worksheet - Triplot was determined form of these types of solid particle (Fig. 1). To generate oscillatory movement was used laboratory stand equipped with a crank rod mechanism ( Fig. 2). Because the laboratory stand has tyrants horizontal and vertical the sieve block executes oscillations on three directions. It is very difficult to follow the solid particle on the surface oscillating, so it was used two video cameras, Sony DCR-SR 36, which has record speed is 25 frames/second. Cameras have been placed in two perpendicular planes (Fig. 3), in order to track particle movement on plans: a) XOY – camera no. 1; b) XOZ – camera no. 2.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 265 During these measurements we used a blind screen inclined to the horizontal at an angle of 7. Inclined flat surface was subjected to oscillatory motion of amplitudes: a) on axis OX on 0.723 mm; 1 2 3 4 b) on axis OY on 0.38 mm; c) on axis OZ on 1.01 mm. Fig. 1 – Determination of solid particle shape: a – length, b – width, c – thickness. 5 6 7 8 F ig. 2 – Laboratory stand components: 1 – flow control system, 2 – block the sieve, 3 – device to control of block angle of sieve, 4 – frameworks, 5 – counterweight, 13 9 10 11 12
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BULETINUL INSTITUTULUI POLITEHNIC D
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