Namangan Institute of Engineering and Technology

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Namangan Institute of Engineering and Technology Pdf ko'rish
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Bog'liq ТўпламNamangan Institute of Engineering and Technology
nammti.uz
10.25.2023
Pg.574
3.
Василевская Е.А. Профессиональная направленность обучения математическим
дисциплинам студентов технических вузов: дисс…. канд. пед. наук / Е.А. Василевская. М.,
2020. - 229 с.
EFFICIENT SEPARATION OF FIBER FROM COTTON SEEDS
M.Mirzakarimov
Namangan Institute of Engineering and Technology
Abstract: A new design is simulated after determining the factors that increase the efficiency
of fiber extraction. In our new construction machine, the air blowing system collects the air flow
coming from the fan through a rectangular tube of b=250mm x h=250mm and collects it in the
whole air blowing system through a slot with a size of S=150cm x 0.5cm= 75cm
2
. sends The air
flow comes out of the slot of the air blowing system at a speed of 63 meters per second and
removes the fiber from the saw teeth and transfers it to the air intake system. In this case, we take
the diameter of the guide pipe as 105 mm.
Keywords: saw cylinder, impact force, fiber damage, air, fiber quality analysis.
Introduction. In the working chamber, the saw teeth of the saw cylinder draw fiber from
the raw material shaft consisting of cotton, pull the fiber through the slits of the grate, and the
process of separating the fiber from the seed occurs. Fiber adjacent to the saw teeth is removed
from the saw teeth using a removal device. [1]
The efficiency of the fiber removal device with the help of air flow depends on the width of
the nozzle opening, the active flow rate, the contact time of the saw teeth of the saw cylinder
with the working air flow, the length and curvature of the guide part, the ejection coefficient, the
shape and location of the opening of the intake pipe. [2].
The width of the nozzle slot depends on the active air flow consumption and fiber removal
efficiency. In order to reduce the air consumption and improve the mixing process of the active
air flow and the injection air flow, it is desirable to have the smallest value of the air flow exit slot
width, but the experience has shown that if the slot width is less than 4 mm, the saw teeth of the
fiber normal removal is disturbed. [3]
When the width of the hole exceeds 6 mm, the air consumption by the active stream
increases and the air suction from the gap between the saws in the saw cylinder increases,
therefore, in the existing designs of devices for removing fiber from the saw teeth, the width of
the nozzle slot is taken up to 5-5.5 mm .[4]
The distance between the surface of the nozzle guide edge and the minimum gap between
the teeth of the saw cylinder is 30-32 mm. To ensure the normal state of fiber extraction, the
current of active fiber extraction must be Vc=55 ÷ 60 m/sec. If the flow active fiber removal
current is Vc<55 m/sec, then the fiber removal is partially impaired and the fiber removal rate
from the saw teeth decreases. The length of the zone of intensive fiber removal is L = 89 mm, and
the time spent by the saw teeth in the zone of intensive contact is 0.0113 s for the existing designs
of devices with a lower position of removal from the saw cylinder saw teeth. For the existing
designs of the devices with saw cylinder removal above the saw teeth, the length of the intensive
fiber removal zone is L = 56 mm and the time is 0.0071 sec [5].
The removal device in the lower position from the saw cylinder saw teeth provides the best
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