World scientific research journal
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Volume-40_Issue-2_June-2025
124
SLOW TO THE GROUND THE TEETH OF THE WORKING UNIT IS
ACROSS THE SOIL SOFTENING ZONE STUDY OF THE EFFECT OF
SECTION AND ANGLE OF SHOT
Makhmudov Fakhriddin Rakhmonjonovich
Namangan State Technical University
e-mail : maxmudovf692@gmail.com
Phone: +99899 9790594
Abstract.
One of the most important works in the whole complex of agro-
technical measures to prepare the ground for sowing of cotton is harrowing. The article
examines the impact of cross-sectional shape and angle of the tooth cusp of a new joint-
spike-tooth harrow made of local recycled ferrous metal by casting. Examined the
teeth of various cross-sections: square, oval, round. The teeth are wedge-square
work surface and different value sharpening angle. The optimal value of the cross-
sectional shape and angle of taper of the tooth.
Kеywоrds:
Cross-sectional surface, gear softening soil link, Deformation, rate
of advance.
Village household their crops in cultivation to the ground planting before
processing to give many work and energy demand to do is an operation . T to the ground
processing in giving important from the process considered toothed blizzards of the soil
surface to the part processing give and give was of the soil surface part of softens and
his/her natural humidity save to stay conditions creation with together , growing
emerging stranger the grass loses and lands known to the extent smooths .
Proposal being pushed plow local raw from the thing , that is secondary black
from metal casting method with is prepared . Such toothed of the snowplow optimal
parameters justification for , to take visited scientific and practical research as a result
following situation being necessary was theoretical research issues come it turned out
a ) K decimal section surface shape; b) Sharpening angle; c) Thickness; g)
Tooth tip length, etc.
In the article, gear softening soil cross section of the link the issue of justifying
the shape of the surface was considered. The tines of the harrow grind the
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Volume-40_Issue-2_June-2025
125
1
soil The soil is first compressed in the horizontal direction during the movement of the
tooth, and then crushed when the deformation reaches a critical value . The degree of
soil softening depends mainly on the deformation rate of the soil and the shape of the
transverse cross-section of the tooth [1]. As the deformation rate increases, the stress
concentration also increases. As a result, the quality of soil softening increases.
We will consider the interaction of teeth with a circular, oval, and wedge-shaped
cross-section, mounted vertically on a harrow, with the soil . When a circular tooth
moves with a speed V
n ,
its working surface is hit soil particles AV at the
station (this on the ground
1
,
1
don't move forward speed direction with
of the soil to the tooth beaten from the point around passed normal between corner,
-t is a noun steel with friction corner) only tooth way according to forward
speed with will be pushed (this at the station
90
) . V
a1
=V
n
(1)
However, this only occurs during the initial period of movement . Because in the
AB section, a cone-shaped core is formed from soil particles [2]. Further deformation
of the soil occurs through this core. As a result, the tensile resistance of the tooth
increases, and the quality of soil loosening deteriorates . Because there, the friction of
the soil on the steel is replaced by the friction of the soil with the soil, which leads to
excessive energy consumption.
Tooth A D and BC at the station tooth with meet soil
the angle of friction of the particles on the circle normal moves in a direction that
deviates from . This in motion (Figure 1, a) of the soil deformation
this on earth
1
- the angle between the normal and the forward velocity direction
transferred to the circle . From formula (2) and Fig. 1, a, it can be seen that the soil
deformation velocity in sections AD and BC is proportional to the forward direction of
the aggregate movement. to the speed correct proportional being, soil particles
contact point tooth from the arrow to move away looking at less is, that is
1
increase with decreases and
90
0
when it is to zero equal will be.
Thus, when a circular tooth is used, the deformation rate of the soil is not uniform
along the thickness of the tooth , i.e. , it is greater than the maximum value
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Volume-40_Issue-2_June-2025
126
corresponding to the axis of symmetry (V
n of the unit).
from speed) decreases to zero.
This effect of the tooth on the soil reduces the concentration of stresses, as a result, the
quality of soil softening decreases . In addition, the speed of the tooth deformation of
the soil is small. or to zero equal was right on the part arrived lumps without crushing
to the side
pushed will remain. Oval Simon teeth both to the ground effect will be similar to
circular teeth (Fig. 1 , b ).
Soil deformation speed as follows:
V
V
class
, (3)
this on the ground
-t work exacerbation corner half.
a
n
cos
(Fig. 1, c) and expression (3) show that the soil deformation rate is the same on
all working surfaces of the conical tooth and deforms the soil uniformly across the
coverage width (tooth width) . Since the soil softened by the conical tooth is moved
with relatively large kinetic energy, additional crushing occurs as a result of the
collision of the pieces. From formula (3) it can be seen that the soil deformation rate in
conical teeth depends on the aggregate speed and the tooth sharpening angle . With
their increase, the deformation rate also increases and, due to this, the soil softening is
improved.
1-
picture When the shape of the
teeth is different the soil
Determining the rate of
deformation.
2-picture A particle of soil tooth
Scheme of studying the behavior
under the influence.
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Volume-40_Issue-2_June-2025
127
in this case, the soil will stick to the working surface of the tooth, and the softening effect
will be damaged. Therefore, the sharpening angle of the tooth 2
it is recommended to
choose based on the condition of "ensuring the soil slip from the working surface" . T is
determined from the following condition [2].
90
(4)
According to literature data [3], the coefficient of friction between unpolished
steel and medium-heavy soil with a moisture content of 15...19% is 0.68..0.72 between
will be. This friction corner 34..36
0
for the price of suitable comes. Such in the case
2
110
0
will be .O date 3B3S-1.0
and
3B3TU- 1.0 tooth
harrows,
this angle is
2
90
0
(
4
)
condition
It has been found from experiments that increasing the speed of the snowdrifts
improves the loosening and leveling of the soil. However, the speed is 2.5 m/ s . After
increasing from , excessive soil dispersion occurs. As a result, ditches are formed, the
wet layers of the soil are pushed up, and the resistance to the rain is increased.
Let's look at soil scattering and ways to reduce it . tooth under the influence
movement seeing we go out. Vertical located
tooth V
n
speed with when moving
m
massive soil particle A , tooth
work
surface
From point
M
V
V
class
with absolute
speed
1
a
n
cos
moves and known from time to time later
M
2
comes to the point. That's it on point soil
particle tooth from the outside separated, soil on the surface initial
And
speed with
the movement continue will give and how much h to the distance go stops.
This distance determination for of a particle field on the surface movement
expressive
differential equation We will fix it. Particle And
direction (x read) according to
differential equation is as follows
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Volume-40_Issue-2_June-2025
129
x
a
x
d
2
x
It happens:
m
dt
2
f
1
mg
(5)
here
f
1
mg
T
1
friction
force, f
1
soil
with soil
friction coefficient.(5) equation
t
time according to if we integrate:
V
f
1
gt
c
(6)
x
f
1
gt
2
2
c
1
t
c
2
7
Using
the initial
conditions , the integral
constant
c
1
and
c
2
what
we find:
t
0, V
x
And , x
0
when
c
1
And
, c
2
0
will be.
(6) and (7) to equations
c
1
and
c
2
what values if we put,
V
V
f
1
gt
1
t
2
(8),
X
W
a
t
f g
2
(9).
The fact that the final velocity of the particle is zero for By setting the right-
hand side of equation (8) to zero, we find the time of movement of the particle:
t
And
f
1
g
(10)
Found
t
time (9) to the formula let's put, and
V
2
class
2
And
V
class
n
cos
that it is
to your attention
take ,
L
n
2 f
1
g cos
2
(11)
1
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Volume-40_Issue-2_June-2025
130
V
n
c
From equation (11) It looks like soil particle from the tooth from separation then
from moving until it stops by pressing past
L
distance don't move forward speed and
tooth exacerbation corner
of sinus to squares correct
proportional of the soil physicist - mechanic to its properties (
f
1
and
) is related This
will be from the equation again that to see it's possible to storm movement speed
necessary to the extent increasing the soil designated far away of throwing provision
for , tooth sharpening corner
It is necessary to reduce
.
Using
expression
(11), we can find the
difference between
and
V
n
to contact finding possible . This for plow speed every what distance
L
at
the value
does not change because reception we will do Snowstorm
permission
done maximum don't move forward speed V
nk
with we mark .
V
2
class
2
V
2
class
2
He in case
L
n k
c
n n
n
(12)
2 f
1
g cos
2
2 f
1
g cos
2
This from the ground
arcsine
V
nk
class
c
n.n.
(13)
Here
c
-
existing
ZBZS- 1.0
and
ZBZTU-
1.0 of the tine
exacerbation corner;
n
, V
n
- fast moving of the snowplow suitable sharpening corner
and don't move forward speed. (13) from the expression It can be seen that as the
speed of movement increases,
L
It turns out that the angle of sharpening of the tooth
needs to be reduced to keep the value unchanged.
Currently used of the snowplow permission done speed
V
nk
2.5 m / c
and exacerbation corner
45
0
values (13) to the expression put, 3.0...3.3 m/ s
speed for tooth exacerbation corner calculation possible.
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Volume-40_Issue-2_June-2025
130
n
n
32...36
0
or
2
64...72
0
.
REFERENCES:
1.
Мухамедов, Д., Абдувахобов, Д. А., Исматуллаев, К. К., & Набижонов, У. А. (2020).
Определения факторов влияющих на качественные и энергетические показатели работы
зубовой
бороны
копирующей
рельеф
поля.
ПРОРЫВНЫЕ
НАУЧНЫЕ
ИССЛЕДОВАНИЯ: ПРОБЛЕМЫ, ПРЕДЕЛЫ И ВОЗМОЖНОСТИ, 51.
В.А .Гордеев
«Ткачество». М.-1984 г.
2.
Мухамедов, Ж., Турдалиев, В. М., & Косимов, А. А. (2019). ОПРЕДЕЛЕНИЯ
УГЛА ЗАКРУЧИВАНИЯ СОСТАВНОГО ЗУБЧАТОГО ШКИВА. In Перспективное
развитие науки, техники и технологий (pp. 192-195).
