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THEORETICAL BASES OF FORMING AN EARTH BED BY MEANS OF SPHERICAL DISKS
Komilov Nematilla Muhammadjonovich, researcher, Scientific research institute of mechanizationand agriculture electrification Republic of Uzbekistan E-mail: knm_1977@umail.uz
THEORETICAL BASES OF FORMING AN EARTH BED BY MEANS OF SPHERICAL DISKS
Abstract: In the article about the theoretical foundations of the shape of a spherical disk can be realized by changing the angle of rotation relative to the direction of movement of the disks to form the required level of operating conditions.
Keywords: diameter of disk, installation angle of disk with regard to motion direction, ascending angle of soil pieces throught the running surfaces of disk, depth of sinking disks into the soil, height of earth bed being formed, spreading away distance of soil pieces coming out from the disk in the longitudinal direction.
The results of conducted analysis on the literature In conditions of our country, making spherical disks
and comparative test implementations [1] showed that have been studied by several researchers [2] researchers it is reasonable to apply the spherical disks in by consum- base on the researches implemented by them and each
ing a less energy (power) and by this way to reach the required level of forming a earth bed.
earth bed shall be formed by two disks installed at the opposite position each one another of (Scheme 1).
Scheme 1. Of forming the earth beds by spherical discs
and
In this case the following terms should be executed *=(i)
0,5Dsin ^ sin a < y < bk -Dsin^sina, (2)
In this case h - depth of sinking disks into the soil; Rn - height of earth bed being formed; kc - coefficient of soil tillage; D - diameter of disk;
Section 11. Technical science
Y1 - ascending angle of soil pieces throught the running surfaces of disk;
a - installation angle of disk with regard to motion direction;
y - spreading away distance of soil pieces coming out from the disk in the longitudinal direction.
In case if the 1st term is executed in order to form earth bed it will be enough for the required level level a height of soil excavated by the disks.
In case if the 2nd term is executed the soil pieces will drop onto the middle part of earth bed that means an earth bed is formed at the account of spreading away under the dropping down angle naturally. It outcomes in forming stable and big heighted earth bed.
By using the following formula we may determine the spreading away distance of the soil pieces coming out from the disk longitudinally [3].
y =1 \vj (sin0o cosa + cos0Q sin a cos ^ )-- 0,5 Va sin 2a sin ^ ] x
(3)
y.[Va cosa cosy + VT cos 0 sin y + < [Vacosa cos y +
+ VT cos^0 sin y ]2 + 2g R (1 - cosy )-hg ]
in this formula f0- soil pieces outgoing angle out the disk, degree;
rom
Vj - relative velocity of soil pieces coming out from the disk throughout disk working surface, m/s;
V - assembly speed, m/s.
After analysis of the formulas (1), (2) and (3) it is seen, that in effort to reach forming an earth bed with the required level disks should move under the soil at a certain depth and at the same time relatively installation angle and motion velocity can be changed relatively due to its diameter, motion direction.
Regarding the formula (1) in order to form the earth beds in accordance with the agricultural requirements (24 ± 3 cm) average sinking depth of the disks into the soil should be 11,92-14,63 cm.
From the literature materials it is known, that the disk diameter is related with its sinking depth into the soil and by using the following formula it may be determined [3-4]
i+jkc
In this case kn - is coefficient equal to 2.5 - 4.0 [5] for the earth bed forming assembly;
Lets put k with its values as it is identified and h
n g
with its values as above specified (4), and so determine the necessity of the disk diameter to be at 480-580 mm.
So if we consider these results, in effort to form earth beds for the required level for provided (set) labor conditions and speed range it should be implemented by way of changing the installation angle relative to motion direction of the disks.
D = k
(4)
References:
1.
2.
3.
4.
5.
Khojiyev A., Komilov N. Choosing the type of earth bed forming operating element // "Independent training of competitive personnel: cooperation of world education system with higher education institutions" Materials collection of Republican scientific-practical conference. 20-21st of May - 2010.- Namangan,- 2010.- P. 76-78. Khudoyorov A., Igamberdiyev A. Introducing the process of tilling earth beds forming by means of minimum tilling earth beds forming combined unit into practice // Effective using of new foreign machines and technologies under the soil climatic conditions of Ferghana valley.-Andijan.- 2009.- P. 159-162. Hamidov A. Design of agricultural machines. - Tashkent: Teacher,- 1991.- 246 p. Shoumarova M., Abdullayev T. Agricultural machines.- Tashkent: Teacher, - 2002.- 424 p. Postnikov N. M. and others. Potatoes sowing machines.- M.: "Machinery" - 1981.- P. 93-105.
