CC BY
3
Section 7. Technical sciences
Mavlyanov Aybek Palvanbaevich, researcher, Djuraev Anvar, prof. doctor of sciences Tashkent institute of textile and light industry E-mail: elmonovsirojiddin@gmail.com
PIN DRUM WITH THE POLYHEDRAL SPLITS OF RAW COTTON CLEANER
Abstract: This article states a scheme of a new design of loosening drum with the polyhedral splits and its principle work. Keywords: Pin drum, splits, polyhedral splits, loosening's, cleaning, uniform motion, fluff, work regime, heavy much damage of seeds and fibers, a cleaning effect.
The existing design of loosening drum of cleaning fibrous material [1] contain a cylindrical shell with the metal strips and fastening splits on them, installed longitudinal rows. Defects of known loosening drum of cleaner is that due to bad taking by splits a portion of material and dragging them on perforated surface an insufficient effect has been observing. Besides, that, measured installed a drum splits leads to monotonous force the last ones on the fluff of seed cotton. As dirty has been found in raw cotton in chaotic condition of various depth so monotony of percussive forces by splits don't secure the optimal terms for discharging the impurities with the arbitrary coordinates of finding and bedding on the surface of fluffy.
According to cleaner of fibrous material for cleaning of influence monotony has suggested to create the flat working surfaces on the work part of splits and install in mixed order in every row of a drum at angle 30 0 relative to direction of motion of seed — cotton particles. Defect of this design is low cleaning effect due to considerable influences of splits of their angle of meeting with the fluffy of seed-cotton.
Defect of this design is that everyone surfaces (sides) splits have been turned upon one direction that leads to appearances of horizontal composing a power of crush that is to say a peculiar displacement which occurs in an only direction. It leads to irregularity of treatment along the length of working part, as well as faces [2].
Which the purpose of increasing of cleaning effect offibrous material a new pin drum has been recommended ensuring the percussive forces by splits, available polyhedral flat surfaces on the working part (polyhedral prism) what is more every flatness has turned regard to an axis of splits. In such fulfillment of splits a considerable increase of cleaning effect due to force of splits on fluffy of seed cotton which the various force as the same quantity as the direction [3].
The essence of this design has been explained by a scheme which is shown in picture 1, here in figure 1 - a total appearance of a drum, in figure 2 - a total appearance of a design of split, in figure 3 - a scheme of installation of splits on the drum, in figure 4 - scheme of interaction of splits on the fluffy of cotton.
The design consists of a drum 1 and polyhedral splits 2, installed on its surface and polyhedron has carried out only upper, working part of splits 2.
During the rotation of a drum 1 in process of work, split 2 interacts with seed-cotton, the last one undergoes direct percussive actions under different angle of meeting. It has been achieved due to
use of polyhedral splits 2, which allows the optimal terms for discharging the impurities in arbitrary coordinates of finding and bedding on the surface of fluffy. Because of interaction of pin sides 2 at various angle to a fluffy different quantity and direction the indignant forces which allows to discharge foreign impurities with the various parameters are arisen. This effect is forced due to turning of split sides 2, as well as mounting of splits 2 on the surface of a drum 1 as on a chess-board, moreover, neighboring splits 2 have been displeased on an axis of mounting to an angle / n, here, n — a quantity sides on the splits 2. Besides that, it should be noticed, that execution ofworking and of split 2 the polyhedral ones allows creating a local area in a zone of direct interaction of fluffy with the split 2 and to achieve simultaneous discharge of foreign impurities and their blow from working zone that it also gives a cleaning effect. It should be explained by scheme expressed in figure 4. At work seed-cotton gets under forces of splits 2, which have polyhedral plane on the working part 2, and depending on direction of received percussive impulse S, foreign impurities have been discharged by fluffy only with the certain position.
Impulsive action of drum split on the fluffy of cotton has been determined by system
J^ = M -M dt g c S = Rm(rnmax -®min)
Here, J - a suitable moment of a drum; w an angular velocity
of a drum; M - motive force moment; M - a suitable moment of
' g ' c
resistance, R - a working radius of a drum; m - mass of cotton fluffy, t - time.
For instance, with a blow of split 2 on a fluffy in variant A, because of rise of inert force a fluffy might has been discharged only foreign impurities a, b, c and d, and foreign impurities e, f, k, l, m, n, o, and p might have been discharged by a blow of splits 2, working parts are located at an angle of fluffy motion. A turn of every flatness of polyhedral split 2 in regard to its axis promotes to decrease of heavy damage of fibers and seeds during cleaning, as in this case is observed the principle, more easy a blowing interaction of working side of split with seed-cotton than with the straight, acute side.
To increase a cleaning effect of fibrous material faces and ensuring the uniformity of treatment of a material along the whole length of the working parts of machines we recommended a new working
PIN DRUM WITH THE POLYHEDRAL SPLITS OF RAW COTTON CLEANER
drum. In this design polyhedral splits of loosening drum have been turned in both sides. Moreover, a turn of upper foundation of split in regard to lower on around an axis will be changed clock-wise, and a neighboring split will be changed counter clock wise.
However, the splits made by such volume figure (prism) can have a quantity of sides about 4-10 accounting by production necessity.
Picture 1. Loosening drum of a cleaner of fibrous material
Figure 2.
Figure 3.
In this case an angle of turn of upper founding of split 2 regard to lower one will be changed within the limits.
•180°
2n_ 2 __. n "(4-10)
_ 360 ^ 900
Here, n - a quantity of split sides 2.
A turn of very flatness of polyhedral split 2 in regard to its axis decreases much damage of fibers and seeds during cleaning, as in
Figure 4.
this case is observed the principle, more easy a blowing interaction of a working side of split with seed-cotton than with the straight acute side (an increase of angle 0 more than 90% leads to increasing of twisted fibers).
Conclusions: Developed a pin drum of a seed-cotton cleaner is allowed to increase the efficiency of loosening and cleaning of fibrous material from foreign impurities, particularly at rotation of a drum with the variable and an angular velocity.
References:
1. Мирошниченко Г. И. Основы проектирования машин первичной обработки хлопка. - М.: Машиностроение, - 1972. - С. 153.
2. Сафаев А. А. Повышение эффективности очистки хлопка-сырца тонковолокнистых сортов. Канд. дис. - Ташкент. - 1984. - С. 116.
3. Джураев А., Сафаев А. А., Гафуров А. А., Исламов Э. Б., Мавлянов А. П. Рыхлительный барабан очистителя волокнистого материала. Патент РУз. № 1АР 03023, - Ташкент, Бюлл. - № 2, 28.04.2006 г.
