512
C. Popa et al.
45.4
x +
0.08
+
2
x
0.005
-
y =
R² = 0.9179
47.986
x +
0.0629
+
2
x
0.0086
-
y =
R² = 0.9124
35
40
45
50
55
0
1 0
2 0
3 0
4 0
k
1 (%)
e (mm)
y = -0,006x 2 + 0,076x + 57,14
R² = 0,994
y = -0,004x 2 + 0,040x + 61,77
R² = 0,950
45
50
55
60
65
70
0
1 0
2 0
3 0
4 0
k
1 (%)
e (mm)
Fig. 6 Variation of the degree of seeds separation of the first-quality k 1 with respect to the eccentricity of the slider-crank mechanism, for the angles of inclination of the chaff cover γ = 30° and
γ = 60°, for wheat (left) and barley (right)
7.5429
x +
0.0514
+
2
x
0.0018
-
y =
R² = 0.9673
6.1
x +
0.09
+
2
x
0.0025
-
y =
R² = 0.907
4
6
8
10
0
1 0
2 0
3 0
4 0
k
2 (%)
e (mm)
10.3
x +
0.1
+
2
x
0.005
-
y =
R² = 0.9441
8.3286
x +
0.1393
+
2
x
0.0054
-
y =
R² = 0.9012
3.5
5.5
7.5
9.5
11.5
13.5
0
1 0
2 0
3 0
4 0
k
2 (%)
e (mm)
Fig. 7 Variation of the degree of seeds separation of the second-quality k 2 with respect to the
eccentricity of the slider-crank mechanism, for the angles of inclination of the chaff cover γ = 30°
and γ = 60°, for wheat (left) and barley (right)
⇒
a Mx = a Bx − ω
2
2 − ε 2
a My = a By − ω
2
2 + ε 2
(14)
Replacing, at a time, the classic slider-crank mechanism with four eccentric slidercrank mechanisms (e = 10, 20, 30 and 40 mm, respectively) produced the results of
Figs. 6 and 7 [9].
4 Results and Discussions
The variations k 1 = f (e), k 2 = f (e) are illustrated in Figs. 6 and 7, respectively. The
determinations were made using a classic slider-crank mechanism to drive the sieves
and then repeated using four eccentric slider-crank mechanisms (e = 0, 10, 20, 30
and 40 mm, respectively). It is should be noticed that the seed separation of the firstquality, as well and of the second-quality, is optimal for the slider-crank mechanisms
with eccentricity of approximately 10 mm.
The variation of the degree of separation of the seeds of the first-quality k 1 and
of the second-quality k 2 with respect to the eccentricity of the slider-crank mechanism, for the angle of inclination of the chaff cover γ = 30° and γ = 60°, is best
C. Popa et al.
45.4
x +
0.08
+
2
x
0.005
-
y =
R² = 0.9179
47.986
x +
0.0629
+
2
x
0.0086
-
y =
R² = 0.9124
35
40
45
50
55
0
1 0
2 0
3 0
4 0
k
1 (%)
e (mm)
y = -0,006x 2 + 0,076x + 57,14
R² = 0,994
y = -0,004x 2 + 0,040x + 61,77
R² = 0,950
45
50
55
60
65
70
0
1 0
2 0
3 0
4 0
k
1 (%)
e (mm)
Fig. 6 Variation of the degree of seeds separation of the first-quality k 1 with respect to the eccentricity of the slider-crank mechanism, for the angles of inclination of the chaff cover γ = 30° and
γ = 60°, for wheat (left) and barley (right)
7.5429
x +
0.0514
+
2
x
0.0018
-
y =
R² = 0.9673
6.1
x +
0.09
+
2
x
0.0025
-
y =
R² = 0.907
4
6
8
10
0
1 0
2 0
3 0
4 0
k
2 (%)
e (mm)
10.3
x +
0.1
+
2
x
0.005
-
y =
R² = 0.9441
8.3286
x +
0.1393
+
2
x
0.0054
-
y =
R² = 0.9012
3.5
5.5
7.5
9.5
11.5
13.5
0
1 0
2 0
3 0
4 0
k
2 (%)
e (mm)
Fig. 7 Variation of the degree of seeds separation of the second-quality k 2 with respect to the
eccentricity of the slider-crank mechanism, for the angles of inclination of the chaff cover γ = 30°
and γ = 60°, for wheat (left) and barley (right)
⇒
a Mx = a Bx − ω
2
2 − ε 2
a My = a By − ω
2
2 + ε 2
(14)
Replacing, at a time, the classic slider-crank mechanism with four eccentric slidercrank mechanisms (e = 10, 20, 30 and 40 mm, respectively) produced the results of
Figs. 6 and 7 [9].
4 Results and Discussions
The variations k 1 = f (e), k 2 = f (e) are illustrated in Figs. 6 and 7, respectively. The
determinations were made using a classic slider-crank mechanism to drive the sieves
and then repeated using four eccentric slider-crank mechanisms (e = 0, 10, 20, 30
and 40 mm, respectively). It is should be noticed that the seed separation of the firstquality, as well and of the second-quality, is optimal for the slider-crank mechanisms
with eccentricity of approximately 10 mm.
The variation of the degree of separation of the seeds of the first-quality k 1 and
of the second-quality k 2 with respect to the eccentricity of the slider-crank mechanism, for the angle of inclination of the chaff cover γ = 30° and γ = 60°, is best