Table 2. Test factors and levels.
Levels
Factors
Angle of Belt‐Rod X
1
Linear Velocity of Belt‐Rod X
2
Harvest Forward Velocity X
3
−1
17.5°
1.20 m/s
0.80 m/s
0
25.0°
1.35 m/s
1.00 m/s
1
32.5°
1.50 m/s
1.20 m/s
4. Results
4.1. Single‐Factor Test Results
The effect of the belt‐rod angle on the separation effect is shown in Figure 13. When
the angle of the belt rod increased from 10° to 40°, the peak values of the maximum force
on the potato tubers were 55.55 N, 81.68 N, 82.99 N, 119.54 N, 149.41 N, respectively. The
soil removal rates were 96.87%, 97.67%, 98.21%, 98.45%, 98.45%, and the bonding break‐
age rates of soil blocks were 39.24%, 42.87%, 46.47%, 58.19% and 65.20%, respectively.
(a)
(b)
(c)
Figure 13. The effect of the belt‐rod angle on the separation: (a) peak values of the maximum force
on tubers; (b) soil removal rates; and (c) bonding breakage rates.
The effect of belt‐rod linear velocity on the separation effect is shown in Figure 14.
With the increase in the linear velocity of the belt‐rod, the peak of the maximum force on
the potato block was 118.75 N, 109.72 N, 80.99 N, 87.81 N, 66.41 N; the soil removal rate
was 98.55%, 98.11%, 98.21%, 97.81%, 97.57%; the bonding breakage rate of the soil block
was 45.11%, 43.82%, 46.47%, 44.78%, and 48.44%, respectively.
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
7,500
10,000
12,500
15,000
17,500
20,000
22,500
25,000
27,500
Nu
mbe
r
of
bon
ds
be
tw
ee
n
so
il
p
ar
tic
les
Time / s
10.0°
17.5°
25.0°
32.5°
40.0°
Agronomy 2022, 12, 1734
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( a)
( b)
( c)
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