506
C. Popa et al.
sorting) and prior to millings, such as density, hectolitre weight, as well as friction
coefficients between seeds, between seeds and chaff, and between seeds and sieves.
In the paper [7], Ke Shun Liu studied the influence of vibrations and friction on
the quality and efficiency of seed separation by sifting.
Also, Stendish made an extensive study of the movements, velocities and accelerations of the component parts of the drive mechanisms of the planar and cylindrical
sieves in the article [10].
2 Materials and Methods
This paper aims to supply optimum ways of cleaning and sorting the wheat and barley
seeds. An experimental stand has been used, made of two bodies out of which the
higher one having adjustable slope (1…8°) and the lower one having a fixed slope
(15°). The machine has also a centrifugal ventilator. Measurements were made for
five values of the airflow velocity [8, 9].
A mixture of 30 kg of wheat seeds and 30 kg of barley seeds was used.
This experimental stand (Fig. 1) is intended for cleaning and sorting by size and
aerodynamic properties of grains, pastures, technical crops obtained from combines
or walking sticks. It is used for cleaning and sorting seeds of wheat, rye, barley, oats,
rice, peas, beans, lentils, mustard, hemp, sunflower, millet and rape.
Experimental research was done for autumn wheat and autumn barley at three
feed rates of the experiment stand, five airflow speeds set from the machine fan, and
four values of the tilt angle β of the lower sieve of the upper block. The five speeds
of the airflow are: v 1 = 2.3 ms
−1 , v 2 = 3.8 ms
−1 , v 3 = 5 ms
−1 , v 4 = 6 ms
−1 , v 5 =
7 ms
−1 . The four values of the angle β are: β 1 = 2
◦
, β 2 = 4
◦
, β 3 = 6
◦
, β 4 = 8
◦ .
The angle of the upper block with sieves is α = 4°.
The above determinations were repeated using, at a time, four eccentric slidercrank mechanisms (eccentricities of 10, 20, 30 and 40 mm, respectively) instead of
the classic slider-crank mechanism (eccentricity e = 0) previously used [7, 9].
Experiments are realized on the stand in Fig. 1 and with the equipment from
Table 1. Sieves for the autumn wheat and barley seeds are selected, according to the
seed sizes of these crops.
2.1 Determining the Amplitude of the Signal
A number of four determinations were made with signal transducers in three points
of the windrow: P on the upper sieve of the upper block with a sieve (Figs. 2, 3, 4).
All the determinations were performed for the windrow [2–4, 6, 7, 11].
C. Popa et al.
sorting) and prior to millings, such as density, hectolitre weight, as well as friction
coefficients between seeds, between seeds and chaff, and between seeds and sieves.
In the paper [7], Ke Shun Liu studied the influence of vibrations and friction on
the quality and efficiency of seed separation by sifting.
Also, Stendish made an extensive study of the movements, velocities and accelerations of the component parts of the drive mechanisms of the planar and cylindrical
sieves in the article [10].
2 Materials and Methods
This paper aims to supply optimum ways of cleaning and sorting the wheat and barley
seeds. An experimental stand has been used, made of two bodies out of which the
higher one having adjustable slope (1…8°) and the lower one having a fixed slope
(15°). The machine has also a centrifugal ventilator. Measurements were made for
five values of the airflow velocity [8, 9].
A mixture of 30 kg of wheat seeds and 30 kg of barley seeds was used.
This experimental stand (Fig. 1) is intended for cleaning and sorting by size and
aerodynamic properties of grains, pastures, technical crops obtained from combines
or walking sticks. It is used for cleaning and sorting seeds of wheat, rye, barley, oats,
rice, peas, beans, lentils, mustard, hemp, sunflower, millet and rape.
Experimental research was done for autumn wheat and autumn barley at three
feed rates of the experiment stand, five airflow speeds set from the machine fan, and
four values of the tilt angle β of the lower sieve of the upper block. The five speeds
of the airflow are: v 1 = 2.3 ms
−1 , v 2 = 3.8 ms
−1 , v 3 = 5 ms
−1 , v 4 = 6 ms
−1 , v 5 =
7 ms
−1 . The four values of the angle β are: β 1 = 2
◦
, β 2 = 4
◦
, β 3 = 6
◦
, β 4 = 8
◦ .
The angle of the upper block with sieves is α = 4°.
The above determinations were repeated using, at a time, four eccentric slidercrank mechanisms (eccentricities of 10, 20, 30 and 40 mm, respectively) instead of
the classic slider-crank mechanism (eccentricity e = 0) previously used [7, 9].
Experiments are realized on the stand in Fig. 1 and with the equipment from
Table 1. Sieves for the autumn wheat and barley seeds are selected, according to the
seed sizes of these crops.
2.1 Determining the Amplitude of the Signal
A number of four determinations were made with signal transducers in three points
of the windrow: P on the upper sieve of the upper block with a sieve (Figs. 2, 3, 4).
All the determinations were performed for the windrow [2–4, 6, 7, 11].