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Mavlyanov Aybek Palvanbaevich, researcher, Djuraev Anvar, prof. doctor of sciences Tashkent institute of textile and light industry E-mail: elmonovsirojiddin@gmail.com
ANALYSIS OF NEW SCHEME OF FEEDER WITH THE EFFECTIVE WORKING BODIES
Abstract: A scheme of effective design of seed cotton including feed rollers with the intermittent, inclined blades and vibrating screen have been presented in the article and principle of work recommending by feeder of raw cotton carried out in detail.
Keywords: A cleaner of seed cotton, a feeder, feeding rollers, polyhedral splits, a drum, loosening, an uniformity, an effective cleaning.
Introduction. Necessary loosening and uniformity of the supply of fibrous material to the machines for the primary processing of fibrous materials is achieved due to the carrying out of blades of feeding rollers with the intermittent and consisting of short length plates connected rigidly (on one horizontal line) on the surfaces of rollers moreover, a distance between plates have chosen the same length of plate. Besides the blades of feeding rollers are located on the surface of rollers in a staggered manner. In this case plates are located in horizontal flatness going through the axes of feed rollers rotation that opposite the left feed plates has an interplanar zone of the right feed roller [1].
Analyses. Cotton feeders which are used in production contain simultaneously installed the feed blade rollers and receiving spike drum. The draw backs of the known feeder are a low uniformity of feeder and possible slaughters due to insufficient adhesion of the layers of fibrous material with the blades of feeding rollers. In another design of the fibrous material feeder the side working surfaces of feed rollers have made in the form of sinusoidal curve [1].
This design in a certain degree eliminates the slaughters, but it does not ensure the uniformity of feed cotton flies both along the length of feeder and time to time. The principal functions of machines are: loosening of cotton and uniformity of feeding both over the time and along the length of spinner as well as maximum discharge of weed impurities [2].
Existing designs of cotton feeders do not provide a sufficient degree of carrying out of the listed functions.
To improve the effect of loosening, cleaning and uniform feeding of cotton the feeder with the effective working elements have been recommended in the article [3; 4].
Design of feeding rollers with the inclined blades increases the uniformity of feeding by 1,5-2 times [2]. But this design of feeding rollers increases the unevenness of the loading of the working elements along the length of machine, due to axial travel of product.
The essence of suggested design is explained by fact that the blades have installed on the surface of feeding rollers at an angle to the axis of the roller, moreover an angle of inclination of adjacent blades both in the row and along the circumference of a roller have opposite directions and are arranged chess procedure. The angle of inclination relatives to the axis of feeding rollers 25° C... 30° C.
In Picture 1 Figure 1. shows a total scheme of the feeder, Figure 2 shows a diagram of the arrangement of plates on the surface of feeding rollers (Form A in the Figure 1); Figure 3 shows a diagram of a polyhedron split, Figure 4 shows a vibrous mesh surface, Figure 5 shows a diagram of elastic support.
A feeder comprises a working drum 1 with splits 6, a mesh surface 2 disposed below it, feeding rollers 3 with the intermittent blades in the form of plates 4 with the sinusoidal, working surfaces and a loading window 5. Plates 4 are installed on the surface of the rollers 3 at an angle to their axis.
The splits 6 of a drum 1 are polyhedral (see Figure 1, Figure 3). The device works as follows: A fibrous material passes through the loading window 5 to the plates 4 offeeding rollers 3. A rotation of the rollers 3 is transfered to the material which is fed to the workingdrum 1. A working drum 1, pushes the fibrous material through the mesh surface 2, through which the weeding impurities fall down.
During the operation of a feeder, the fibrous material is loose and flexible. Therefore, during the operation of a feeder, plates 4 with a short length provide necessary retention of fibrous material in the space between feed rollers 3. In this case, each part of fibrous material will be influenced by plates 4 of the rollers 3 (see Figure 2). By placing the plates 4 at an angle a leading the whole area of the surface of the roller 3 in a zone of interaction of plates 4 with the fibrous material (a space between the rows of plates 4 is on the surface of the rollers 3). It leads to an increasing of contact area of plates 4 (one can increase a length of blades 4) with the fibrous material, it allows eliminating the fall-out of cotton lumps (fibrous material), thereby also the faces of a feeder.
An angle pitch a of the plates 4 is determined as following. The pitch between the rows of plates 4 on the surface of the rollers 3 is expressed by expression
t = lsina + A (1)
Here: l - a length of a plate 4; a - an angle of inclination of plates 4;
A - the least clearance between the plates 4 of neighboring rows.
Clearance A has been assumed less than an average length of fibers. An average length of cotton fibers of middle-fibrous impurities is (32 ..37) mm, and fine-fiber varieties is (35 ... 41) mm [2].
ANALYSIS OF NEW SCHEME OF FEEDER WITH THE EFFECTIVE WORKING BODIES
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Picture 1. Feeder to machines for processing fibrous material
h
To ensure ^ — — (a maximum clan of a space between rows)
and taking accounts an average length of fibers, an angle of inclination of plates 4 is recommended to be chosen within 25° ... 30°. It should be noted that design that takes litter out grid 2 has done with the holes 7.
A descending grid 2 at the edges in four corners has connected rigidly with it sleeves 8, consists of fingers 9, connected with the body of cleaner 5. Between sleeve 8 and fingers 9 is installed elastic (rubber) sleeves 12. Above the descending grid is installed a split drum (it switched on for realization of work of descending grid). During the process a drum is gripped by splits 6 of a drum 1 and dragged along the grid surface 2.
In this case cotton in a zone of contact is subjected to cyclic action. As a consequence a raw cotton receives a high-frequency vibrations and is shaken. Weed impurities discharging by this way has dropped through the holes 7. At the same time due to change of a total mass of cotton on the surface of grid 2, some deformations of elastic bushings occur 12. Taking accounts, that a mass of
dragging of raw cotton and deformation of bush have been changing 12. It leads to vibration of grid 2 with a certain frequency and amplitude. Therefore, at the beginning in zone of dragging of seed cotton grid 2 vibrations will be occurred with a lot of amplitude due to a large diameter (d1 > d2, thickness) of elastic sleeves 12 in this zone, and at the end of dragging an amplitude of vibrations of seed cotton will be the least one 2. A frequency and amplitude of vibrations of grid 2 depends on rigidity of elastic sleeves 12, mass of grid 2, and changes the mass of dragging raw cotton. Vibrations of grid 2 intensifies with a great extent a discharge of foreign impurities, that leads to increasing of cleaning effect. Besides that, it is recommended to increase a velocity of rotation the left feeding roller at (20 + 25)% relative to the right one.
Conclusions. The new scheme of cotton feed with the polyhedral blades of feeding shafts and drum with the polyhedral splits developed. Formulas for determination of unevenness cotton's feed for existing and recommended design of feeding shafts received, graph dependences built, parameters of feed proved.
References:
1. Джураев А., Мирахмедов Ж. Ю., Мавлянов А. П., Холтураев Х. П. Питатель к машинам для обработки волокнистого материала. Патент РУз. FAP 01030, Ташкент, Бюлл. - № 8, 31.08.2015.
2. Мирошниченко Г. И. Основы проектирования машин первичной обработки хлопка. - М.: Машиностроение, - 1972, - С. 127-201.
3. Джураев А., Бобоматов А., Мирахмедов Дж., Мухаммедов Дж. М. Сетчатая поверхность очистителя волокнистого материала. Патент РУз. № БАР 00696, Ташкент, Бюлл. - № 2, 29.02.2012.
4. Джураев А., Сафаев А. А., Гафуров А. А., Исламов Э. Б., Мавлянов А. П. Рыхлительный барабан очистителя волокнистого материала. Патент РУз. - № ТАР 03023, Ташкент, Бюлл. - № 2, 28.04.2006.
