№4/2020 year. Technical science and innovation
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Mechanical Engineering
227
(3)
and
(4) where
τ is the sowing angle, grad; d 1 and d 2 are the diameters of the sowing disc along the centers of the suction holes located respectively in the
, mm;
H-is the height of the center of the sowing disc from the bottom of the rig, m; l o - is the distance between the holes in a group located in the 1st and 2nd rows, mm; V c - speed of movement of the aggregate, m/s; U a - rotation speed along the centers of the suction holes of the disk, r/m; γ - is the angle between the straight line connecting the centers of the holes in a group in 1 and 2 rows and the radius of the disk, grad.
The following prerequisites are accepted: T=0; V ox = V s – U а sinτ; V оu = U а cosτ; X 01 = 0,5 d 1 cosτ; X 02 = V s T+0,5 d 2 cosτ; U 01 = 0,5 d 1 sinτ; U 02 = 0,5 d 2 sinτ. In this case, T - is the time required for the seeds to be grouped at certain distances in the bottom of the sowing rig, sec. Based on the expressions (3) and (4) and assuming l
follows:
(5)
It follows from these expressions that the quality of cluster formation depends on the speed of movement of the aggregate (V c ), the parameters of the sowing disc (d 1 , d 2 , γ, t ), the angle of sowing (
τ ) and the required distance between the clusters [16]. Assuming a height of 100 mm above the soil surface, N = 0.23 m. Substituting the values
= 180 mm, d 2 = 200 mm, τ = 65
0 , t = 18,5 mm, l u = 0.1 m into the expression (9), we calculate that the speed of the planter is 2.1 m/s, occurs when
0 . In practice, the degree of rarefaction of the air is several tens of times greater than the force of gravity of the seed in order to attach the seed to the disc hole and separate it from the seed mass. Is noted, that the quality of clustering by sowing with a pneumatic planter which has a sowing disk with a horizontal axis of rotation perpendicular to the direction of aggregate movement depends on the operating speed of the aggregate, parameters of the sowing disk, seed |
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