buletinul institutului politehnic din iaşi - Universitatea Tehnică ...

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),
(Soldinger, 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 (Soldinger, 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.