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SUBSTANTIATION OF THE PARAMETERS OF ARC-SHAPED FURROW-OPENER KNIFE
DOI: http://dx.doi.org/10.20534/ESR-17-5.6-79-80
Xudoyberdiyev Tolibjon Soliyevich, doctor of technical sciences, professor of the Department, Andijan agricultural institute Mirzaakhmedov Anvarjon Tursunovich, competitor-researcher, Tashkent institute of engineers for irrigation and land reclamation of the agriculture, Republic of Uzbekistan, E-mail: ax-stajyor@mail.ru
SUBSTANTIATION OF THE PARAMETERS OF ARC-SHAPED FURROW-OPENER KNIFE
Abstract: The results of theoretical researches on substantiation of the parameters of furrow-opener, developed for a seeder for sowing cereal crops in the inter-row of cotton-plant are specified in the article. It is determined that in effort to ensure the qualitative performance of set technological process at minimum energy expenditures, the inlet angle of furrow opener knife penetration into soil must be at least 125°, the radius of its curvature shall not be less than 160 mm, and the sharpening angle — 67°.
Keywords: arc-shaped furrow-opener, knife, the inlet angle of furrow opener knife penetration into soil, the radius of its curvature and sharpening angle.
We have developed furrow-opener to seeder for sowing cereal The following are the main parameters of knife of the developed
crops in the cotton-plant inter-rows [1]. It consists of an arc-shaped furrow-opener (fig. 1, b): a - the angle of entry into the soil; R -
knife 1, a seed-line 2 and is fixed to the muzzle of a parallelogram mechanism by means of post 3 (fig. 1, a).
radius of curvature; y - sharpening angle.
a) 6)
Figure 1. Scheme of arc-shaped furrow-opener (a) and mainparameters (b) of its knife
In let angle of the knife penetration into the soil is determined based on term that ensures the sliding of the plant residues and weeds encountered with it, throughout its blade, as otherwise they are unloaded ahead of the furrow-opener and it outcomes in disruption of the technological process of its operation.
In effort to determine ag values of the angle at which the sliding of plant residues and weeds is ensured, let's consider the forces acting on them from the knife side. The normal force N acts (fig.2) and the frictions force F = Ntg$p (c} (where fp (c) is the friction angle of vegetable residue (weed) on the blade of the knife) onto the plant residue or weed encountered with the knife. The normal force N is divided into two components: N - acting in the direction of
furrow-opener movement and Nr - acting along the knife blade. According to the scheme shown in fig. 2.
N = (!)
sin«
and NT = Ntg
n
a--
1 2
(2)
It is obviously that sliding of the plant residues or weeds throughout the knife blade is ensured
n
Nt= Ntg [a6 - - j> F = Ntg$P (c). From above formula we obtain the following:
(3)
Section 9. Technical sciences
Figure 2. Scheme for determination of inlet angle of the knife of arc-shaped furrow-opener penetration into the soil
a
n A 2 %
p(c )•
(4)
In this case the following formula is obtained:
As it seen from fig.2, this term must been sure das minimum at the field surface level, as the distance from the lower point of furrow-opener knife increases the a6 angle decreases until the point being reviewed. Taking into account (4) from fig. 2 one can obtain the following formula for determination of the radius of knife curvature
tg
Y = 2arctg-
0
T n
2
cos0
T n
(6)
R >
h
1 - sin0
(5)
p (c)
where h - maximum depth of penetration of the furrow-opener
max J- J- J-
knife in to the soil.
Angle of sharpening the knife can be determined on base of term son ensuring minimum soil scattering to all sides for them and not allowing to stick soil to its sharpened part.
It allows to form the qualitative seeding furrow and provide qualitative embedding of seeds as well as reduce removal of the lower moist layers of the soil to the outside of field surface and reduce the energy expenditures for implementing the technologic process.
where an - friction angle of the soil of furrow-opener knife.
Calculations, given base on the formulas (4), (5) and (6) at the event of a ,. = 35 °, h = 80 mm and a = 30 ° [2; 3] showed, that
I P (c) ' max ' n i_ / _i /
the inlet angle of knife penetration into the soil of the developed furrow-opener on the level of soil surface must be at least 125 °, radius of its curvature — at least 160 mm, the angle of sharpening - 67 °.
Conclusions: So, in effort to implement the qualitative operation of the set technologic process at minimum energy expenditures the inlet angle of knife penetration into soil developed arc-shaped furrow-opener at the level of soil surface must be at least 125 °, the radius of its curvature -at least 160 mm, and the angle of sharpening - 67 °.
References:
1. Furrow opener: patent № FAP 00702 RUz., MPK 8 A01 C7/00/t. Khudoyverbiev T. S., Igamberdiev A. K., Vakhobov A. A., Mirzaakhm-edov A. T. № 20100153; request 12.11.2010; publication. 30.03.2012, Bulletin. № 3.
2. Sineokov G. N., Panov I. M. Theory and calculation of soil tillage machines. - Moscow: Machinery, - 1977. - P. 328.
3. Klenin N. I., Sakun V. A. Agricultural and land reclamation machines. -Moscow: Kolos, - 2005. - P. 671.
