Volume 05 Issue 01-2025
62
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
05
ISSUE
01
Pages:
62-69
OCLC
–
1368736135
A
BSTRACT
Analysis of the studies conducted by domestic and foreign academic researchers to improve the lint
separation process shows that the existing lint separation machines have high energy consumption and
low process efficiency. The main reason for these shortcomings is the high coefficient of friction of the
working surfaces of the lint separation machines that come into contact with the raw materials, and the
rapid corrosion of the working surfaces is the cause of these problems. Especially in the autumn and spring
months with high air humidity, the working surfaces are quickly corroded, causing a sharp increase in the
coefficient of friction between the surface and the seed mass. This study focuses on the effect of the
coefficient of friction on the parameters of the lint separation process and its reduction.
K
EYWORDS
Process, lint, performance, air, friction, surface, improvement, machine, corrosion.
I
NTRODUCTION
In our republic, special attention is paid to
increasing the production of high-value-added
finished products based on deep processing of
cotton raw materials, improving the structure of
the country's cotton ginning industry, reducing
the cost of cotton products and improving their
Journal
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Research Article
INCREASING THE EFFICIENCY OF THE PROCESS OF
SEPARATING LINTERS FROM COTTON SEEDS
Submission Date:
October 25,
2024,
Accepted Date:
December 26, 2024,
Published Date:
January 27, 2025
Crossref doi:
https://doi.org/10.37547/ijasr-05-01-11
Eldor Mamurov
Associate Professor, Fergana Polytechnic Institute, Fergana, Uzbekistan
Olimjon Sarimsakov
Doctor of Technical Sciences, Professor, Namangan Institute of Textile Industry, Namangan, Uzbekistan
Volume 05 Issue 01-2025
63
International Journal of Advance Scientific Research
(ISSN
–
2750-1396)
VOLUME
05
ISSUE
01
Pages:
62-69
OCLC
–
1368736135
quality indicators based on technical and
technological restructuring. The new Uzbekistan
Development Strategy for 2022-2026 sets out
tasks, including "...to ensure the rapid
development of the national economy and high
growth rates and to double the production
volume of textile industry products." In
implementing these tasks, it is important to
improve the working chamber of the linting
machine based on theoretical and practical
analysis of the process of separating cotton lint
from the seeds and thereby increase the efficiency
of the linting process, including by improving the
adhesion of cotton lint to the saw teeth and
coordinating the speed of the raw material.
It is necessary to study the lint separation process
more thoroughly and use other methods to
accelerate the exit of the lint-separated seed from
the working chamber. In the research conducted
to date, the issue of accelerating the exit of the
lint-separated seed from the working chamber of
the lint separation machine by improving the
design of the grate has not been sufficiently
studied.
The aim of the research is to improve the
efficiency of the lint separation process by
developing a new, corrosion and erosion
resistant, low friction co-efficient grate design for
lint separation.
A number of studies were conducted on the
proposed grate, improving the working elements
of the linting machine. The purpose of the studies
is to create a plane on the working surface of the
grate-type linting machine so that the separated
seeds can exit the grate-type chamber in a timely
manner, and to prepare a device that performs
this process, determine its effective technological
dimensions, and introduce it into production.
M
ETHODS
The differential equations of the movement of
seeds on a grate with a profile of three broken
straight lines were integrated using piecewise
functions in the Maple 9.5 program under initial
conditions, and the laws of motion and changes in
speed over time, the laws of movement and
changes in speed of seeds on a grate with a broken
linear profile at different angles, and the laws of
change of friction coefficients were studied. An
increase in the friction coefficient leads to a
decrease in the movement and speed of the seeds
over time.
Volume 05 Issue 01-2025
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International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
05
ISSUE
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62-69
OCLC
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1368736135
1- a grate, 2- a seed separated from lint, 3- a saw.
A- distance between saws, mm; B- grate width, mm; h -grate thickness, mm; and d- seed
diameter, mm.
Figure 1. Seed location on the surface of the grate
Below (Figure 1), the laws of motion of separated
seeds on the surface of the grate are theoretically
studied.
Regardless of the degree of coarseness, the forces
exerted by the working surface of the grate on the
separated seeds between the saws are considered
from the point of view of statics.
Mathematical model of the problem.
a) The separated seeds (Fig. 2) move along the
arcuate section AB of grate from top to bottom
under the influence of their own weight G=mg. We
consider the seed to be a material point with a
mass m, and examine its motion: AB is the section,
relative to the natural coordinate system.
Let us assume that the separated seed moves
along an arc AB with radius R and center at point
O.
The equation of motion of the seed along the
surface of the grate is as follows:
{
m
dv
dt
= F
r
m
v
2
R
= F
n
(1)
where R
–
radius of curvature of the grate;
𝜈
–
seed speed;
m
–
mass, kg;
Taking into account all the forces acting on the seed, the
differential equation of motion of the seed along the arc
AB is obtained:
Volume 05 Issue 01-2025
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International Journal of Advance Scientific Research
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VOLUME
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a)
b)
c)
a) seed movement to change related power scheme, (b and c) seed condition
Figure 2. The movement of a seed separated from the wool
S
″
(t) =
g
K
(cos
S(t)
R
− f ⋅ sin
S(t)
R
(2)
This differential equation is solved numerically using
the MAPLE-9.5 program.
t=0 S(0)=0
V(0)=S(0)=0
(3)
The initial conditions were obtained from the results
of computer analysis with the following values of the
parameters: seed mass 0.14
–
0.18 grams (1.4
–
1.8x10
-3
kg), friction coefficient f=0.6; 2-f=0.5; 3-f=0.4, grate
curvature radius R = 0.9
–
0.105 m (90
–
105 mm),
grate length s = 0.6 m, and rotation angle
φ
= 0 - 2
π
.
1- f =0.6 ; 2- f =0.5 ; 3- f =0.4
Figure 3. Time variation of the path traveled by seeds along the grates at different friction
coefficients
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International Journal of Advance Scientific Research
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1-f=0.6; 2-f=0.5; 3-f=0.4
Figure 4. Time variation of the rate of seed falling along the grates at different friction
coefficients
Using the corresponding law of motion, the
dependence of the path traveled by the seeds
along the grates to which the seeds are fixed, the
rate of fall over time, and the speed of the seeds
on the surface of the grates on the path traveled
are presented in the graphs in Figures 3-5 for
three different materials with different friction
coefficients for the working surface of the seeds.
b) We check the movement of the seed and along
the BC section of the grate.
The time taken by the grain to travel the arc AB
from point B of the grate is τ. It moves in the x y
plane with a velocity VB(τ).
Here , the law of motion of the seed with respect
to the xy coordinate system is as follows:
{
mx
″
= 0
my
″
= G = mg
( 4 )
As a result of the analysis of the equation in the Maple
program, the trajectory of the seed's movement in the
BC section was obtained (Figure 5).
Volume 05 Issue 01-2025
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International Journal of Advance Scientific Research
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VOLUME
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1368736135
1-f=0.7; 2-f=0.5; 3-f=0.4
Figure 5. Variation of the speed of movement of seeds along the grate at different friction
coefficients depending on the distance traveled
The analysis of the grain velocities revealed an
uneven distribution of velocities along the
contour, with the highest value decreasing in the
flat part of the velocity, and the velocity
increasing in the final straight part.
Based on the above studies, an alternative
contour of the grate was selected and the laws of
motion of the grains transmitted using them were
studied.
The roughness of the working surface of the grate,
the friction coefficient, and the wear indicators of
the grate were experimentally studied in
laboratory conditions, and taking these factors
into account, the material was selected, and a
grate structure made of a new material was
developed.
The main goal of conducting experimental
research is to eliminate the shortcomings of the
current grate and to create a new grate with a
smooth working surface, i.e., a low coefficient of
friction, wear resistance during the lint
separation process, non-sparking during the
reaction process, high corrosion resistance, ease
of preparation technology and a positive effect on
the efficiency of lint separation, i.e., to improve
the lint separation process. Therefore, if a
material containing an alloy of non-ferrous
metals is taken for the working surface, the above
positive factors can be achieved. In addition, the
method of comparing materials is to identify their
positive and negative aspects and prepare a new
design with optimal properties.
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The selection of a material with high smoothness
for the working surface of a grate and its use for a
new structure is an important task of scientific
research. The roughness of the materials taken
for the sample was studied experimentally. The
materials used for the sample were cast iron of
the Cч15
-
32 grade, steel of the В2Ф grade, and
stainless steel of the 32НК
-
ВИ
grade. The
experimental work was carried out on the “Time
3200” device. This device is capable of testing
materials up to 10 mm long. The surface
roughness value was measured using a specially
installed sensor.
It is possible to see different heights of roughness
on this device, that is, the roughness of an area of
10 mm long can be determined at different values
Table 1).
Table 1. Roughness of the working surface of the grates made of different materials
№
Roughness to be
determined
Cч15
-32 grade
cast iron material
В2Ф
grade
material
32НК
-
ВИ
grade
material
1
R
a
, microns
0.796
0.312
0.180
2
R
q
, microns
1,070
0.429
0.282
3
R
z
, microns
4,996
2,255
2,128
4
R
t
, microns
9,100
4,340
4,519
5
R
p
, microns
2,276
0.680
0.515
6
R
v
, microns
2,720
1,679
1,611
The process of studying the friction coefficient of
materials was carried out in the laboratory of the
Andijan Machine-building Institute on a T25
model device designed to determine the friction
coefficient. As a result, the values f=0.75 and 0.78
were obtained for the cast iron grate material, the
values f=0.57 and 0.62 for the В2Ф grade steel
grate material, and the values f=0.46 and 0.48 for
the 32HК
-
ВИ grade stainless steel material. From
this it can be concluded that it is expedient to
select and use t
he 32HК
-
ВИ grade stainless steel
material as the material with the lowest friction
coefficient for the working surface of the new
composition grate structure.
C
ONCLUSION
The analysis of the results of the studies
considered on the topic led to the following
conclusions:
1. The analysis of the studies conducted by
domestic and foreign scientific researchers to
improve the operation of lint separators and their
main elements made it possible to identify a
number of shortcomings of existing saw lint
separators and determine research directions for
their elimination.
Volume 05 Issue 01-2025
69
International Journal of Advance Scientific Research
(ISSN
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2750-1396)
VOLUME
05
ISSUE
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Pages:
62-69
OCLC
–
1368736135
2. The differential equation obtained as a result of
a theoretical study of the movement of the seed
separated from the lint on the surface of the lint
separator grate made it possible to determine the
trajectory of seed movement.
3. In the process of scientific research, the friction
coefficient showed the values f=0.75 and 0.78 for
the Сч15
-32 cast-iron grate, the values f=0.57 and
0.62 for the В2Ф steel material, and the values
f=0.46 and 0.48 for
the 32HК
-
ВИ stainless steel
material. From this it can be concluded that it is
appropriate to select and use 32HК
-
ВИ stainless
steel as the material with the lowest friction
coefficient for the working surface of the new
grate.
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