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References:
1. Рахимов Ш. Х., Бегимов И. Использовании метода конечных элементов для моделирования двумерного неустановившегося движения воды в открытых руслах.//Проблемы механики, - Ташкент. - Фан, - 2012. - № 3.
2. Кюнж Ж. А., Холли Ф. М., Вервей А. Численные методы в задачах речной гидравлики.
DOI: http://dx.doi.org/10.20534/ESR-17-1.2-228-230
Rakhmonov Hayriddin Kodirovich, Doctor of Technical Sciences, Professor Bukhara Engineering Technological, Institute Uzbekistan
E-mail: [email protected] Shodiyev Ziyadullo Ochilovich, Ph.D, Department"Technological and Equipment" Bukhara Engineering Technological, Institute, Uzbekistan
Oripov Zainiddin Bahodirovich, Department"Technological and Equipment" Bukhara Engineering Technological, Institute, Uzbekistan
Murodova Istat Nurillaevna, Department"Technological and Equipment" Bukhara Engineering Technological, Institute, Uzbekistan Zaripova Mohira Djuraevna, Department"Technological and Equipment" Bukhara Engineering Technological, Institute, Uzbekistan
Basis of saw updating of gin feeder in order to improve purifiering effect
Abstract: To create a new design of technological machines on the basis of a study of the dynamics of machine units, must be new technical solution taking into account the internal and external loads. This article provides mathematical models of cotton movementinside the drum of the feeder. Represented by the formula for determining the length of the drum pegs. Differential equations allows to obtain patterns of change in drum speed, taking into account the dissipative properties of the transmission, allows to define rational values of the dynamic parameters of drives.
Keywords: Gin, feeder drum, sheet, feed, screw, roller, soft impurities, material fabric tension, cotton.
The feeder is included in the overall Gin set installation and feeders are divided into feeders and purifying of feeders cleaners
provides equable feed of raw cotton in the working chamber of gin, raw cotton from small and large sort, in terms of volume of working
a thorough loosening and additional purifying it from trash before drums on the single drum and multi drum. the ginning process. By appointment in the process technological
a) b)
Figure1. Feeder raw cotton and cotton design scheme of movement on the surface of the drum chopping
Basis of saw updating of gin feeder in order to improve purifiering effect
Single Drum feeders are intended mainlyfor loosening and uniform feed of the cotton gin in the working chamber. Construction of single-drum feeders are simple on the device, easy to maintain and repair, but they have a cleansing effect on the small litter only 5-6% [4].
The following technological requirements are put in Saw gin Feeders raw cotton before entering the working chamber of gin should be loosened up its primary structural components — the lobules and sheets; in its composition should not life tramp will take; cotton flow supplied to the working chamber gin must have a high degree of uniformity both in time and in the width of the feeder, a feeder should not be fiber formation defects, crushed seeds and care in sheet litter.
To ensure the above indicators we are proposed modernized peg drum feeder [1; 2; 6].
The construction of feeders which is proposed to us works as follows. Raw cotton with distributional shaft is directed to the mine shaft, it becomes the gin feeder. The feed rollers 1, whereby the rotation toward each other from the feeding mechanism, grasp the cotton out of the mine evenly fed it to the receiving pegs drums 2, which loosen cotton, drags his net surface 3, cleans raw cotton from small trash and supplies its outlet drum 4. Last completing drum 4 serves as a soft trap impurities. Structurally, it is a tree with a diameter of 50-70 mm with radial special pegs. The composition of raw cotton in addition to large and small litter are accidentally trapped while collecting it impurities (pieces of cloth of polyethylene, etc.) The latter, penetrating into the mass of cotton, its special long pegs engage the soft impurities which are wound onto the shaft of small diameter and cleaned periodically. Trash isolated mesh surface through holes are collected at the bottom of the housing and output feeder conveyor 6 weed out. On the tray 5 seed cotton gin sent to the working chamber.
To study the process of cleaning raw cotton accidentally caught by soft contaminants we studied theoretical model of the motion of impurities on the surface of the drum chopping. For carrying out tissue on the surface of the drum chopping occurs forces the tension PH, which has two components P1, P1 on the curved surface of the peg. Based on the theoretical model can obtain the following differential equation [3; 5].
PH[R0 -S -R0 -sinm0(t)]
ms = -
VR0 - s - r
PH[R -S-R0 sina>t(t)] yfR - S - R sin a>t (t) Puffin®, (t )r
ms =
(1)
(2)
f
[exp(f & - f)]-m(R-S)a>2
f
Where;
^-coefficient of friction between the fabric and peg; f- the coefficient of friction between the yarn and cotton fiber; w- frequencydrum speed.
After the solution of the equation (2) numerical method when 0.25, a = n, m = 0.12g, R = 0.25 m we obtain the following relationship
Analyzing the received payments you may choose the length of drum.
When designing peg drum is important to ensure their balance, as well as the necessary strength and stiffness of its parts, the shaft and Pegs strap.
Location of the drum details as in its design must be such as to be statically and dynamically balanced. Due to manufacturing and assembly errors and heterogeneity of the material, in most cases drums are unbalanced, that at their considerable weight and high corner velocities can cause not only additional harmful stress on the
bearings and vibration entire feeder, and this will result in first temporary wear and breakages. However, the studies showed that non-uniformity of the rotation reels peg not only leads to breakdowns, but also reduces the ability of the trap drum, and also reduces the purifying effect of the feeder. In this connection, to detect changes in the load on the working bodies, at the same time we are studied the dynamics of rotating bodies with allowance for dissipative transmission characteristics at one time.
0.0C
Figure 2. Curve determining tissue displacement since the value of the tension force P1 = 1.2, P2 = 0.046H
Design scheme for studying the variation in the rotation of working bodies in view of the mass movement of cotton inside the feeder is shown in Figure 1 (b). Movement of cotton inside the feeder consists of six parts. Of these, the first, third and fifth peg occur on the surface of the drums, and the second, fourth and sixth — with a margin of peg drums.
500
195
196 494
iSS
usu ■
i82
i30
-100
-80
-60
-CO
~r
-20
r 20
¿0
60
r so
wo
Figure 3. Diagram of changing rotation frequency of peg drums
Based on the calculated differential scheme composed equation movement on the surface of cotton peg drum (2).
In solving the equations (3) and (4) used a numerical method of Runge-Kutta method for the second order differential equation
d2s ( ■
of the form S =-= F {t, s ,s). After solving equation of numerical
dt2 1
methods we obtain charts (Figure 3)
(Kv -Sf) ■ sin(2 -n-fafa)
d2
S = — = K
dt2 mp
Kv •(©• R)2
m
+ 2 • o- S + g • sin(o • t + 4>0)
—r - g • cos(o • t + 0J r
dX = _ (K *-Q-sin(. dt2 m
dt2 m
whereK — the coefficient of friction between the cotton and the
mp
drum pegs;
K — coefficient proportionality;
and ^ — the angle of the capture and dumping of cotton groves drum;
® — peg drum speed, s-1; m — cotton weight, kg; R — peg drum of radius, m;
d2 y dt2 ' d2 y dt2 '
(Kv-s;2)-cos(fa)
(Kv -SK2)-cos(2■ n-fa)
(3)
(4)
g — acceleration of gravity, m/s 2;
t — time s;
Conclusion
On the basis of the analysis of the research results it is found that, for effective work drum feeder, which provides its trapping ability of soft contaminants and uniform supply of cotton to the working chamber a given performance, one must reduce irregular rotation peg drum by optimizing the elastic-dissipative parameters transmission.
References:
1.
2.
Rakhmanov HK Development of a rationaltechnology distribution of raw cotton in its storage: Dis ...Cand. tech. Sciences - Tashkent, - 1996. - P. 107.
Dzhuraev A. Modeling the dynamics of machine units ginning machines - Tashkent: Fan, - 1984. - 128 p.
3. Juraev A. Dynamics working mechanisms of cotton processing machines. - Tashkent: Fan, - 1987. - 168 p.
4. Turanov H. T. Swing and loading of composite shafts drum some tyape of cotton machines - Tashkent: Fan, - 1982. - 165 p.
5. Rakhmonov H. K. Nagruzhennost screw shaft cotton supply distributor in their storage//Problems Textiles - Tashkent, - 2009. - № 1.
DOI: http://dx.doi.org/10.20534/ESR-17-1.2-230-232
Rakhmanov Hayridin Kodirovich, Doctor of Technical Sciences, Professor Bukhara technological engineering Institute, Uzbekistan
E-mail: [email protected] Rajabov Ozod Isroilovich, Assistant of the Department of "Technologier and eduipment" Jomardova Dilafruz Qahramonovna, Assistant of the Department of "Technologier and eduipment"
Sayfullayev Sayyor,
Assistant of the Department of "Technologier and eduipment"
Muzrobov Suxrob,
Assistant of the Department of "Technologier and eduipment"
Investigation of methods of preparation of cotton and its components for storage
Abstract: This article discusses the regulation of the process of technical preparation of seeds to send oil mills. Regulations is applicable technical measures for the preservation of quality of seeds on the cotton oil mills. There is expressed the most important physical-mechanical properties of microhardness peel. The results of theoretical study on heat and mass transfer in order to analyze the possibility of an intensification of the uniformity of the heating and drying of raw cotton components.
Keywords: Cotton fibers, polyester, moisture, seeds, oil, drum dryer, peel, core, micro-hardness, heat treatment.
As everyone knows that cotton is the most useful products in the world. It is breathable, hypoallergenic, soft to touch, comfortable for body, rather warm, absorbs moisture, easily bleached, not electrified. Sometimes as an addition it is added an artificial fibers, such as polyester or lycra [1; 4].
Four species (Gossypium arboreum, Gossypium barbadense, Gossypium herbaceum, Gossypium hirsutum)of cotton began in-
dependently used for textile production. In general, since the beginning of the XX century took place in employment drop in the cotton industry due to the development of mechanization. Today, cotton remains as one of major export goods in many countries (Table 1) and a large part of the annual cotton harvest is long staple cotton [2].
