U.S. patent number 3,909,873 [Application Number 05/499,523] was granted by the patent office on 1975-10-07 for device for dedusting loose materials.
Invention is credited to Nikolai Viktorovich Florinsky, Alexandr Nikolaevich Minasov.
United States Patent |
3,909,873 |
Minasov , et al. |
October 7, 1975 |
Device for dedusting loose materials
Abstract
A device for dedusting loose materials in which there is
provided an inclined covered trough along which the loose material
travesl downwards. The trough bottom has an opening with a slot
type grate through which from a bottom inlet, a flow of compressed
air is delivered to pass through the bed of material and be
extracted together with dust particles of the material through an
inlet in the top portion of the trough. The slotted grate is
composed of separate and parallel strips positioned in a step-like
fashion perpendicular to the longitudinal axis of the trough. These
strips are installed for possible turning in relation to their
longitudinal axes to adjust the width of the slots
therebetween.
Inventors: |
Minasov; Alexandr Nikolaevich
(Kharkov, SU), Florinsky; Nikolai Viktorovich
(Kharkov, SU) |
Family
ID: |
27012301 |
Appl.
No.: |
05/499,523 |
Filed: |
August 22, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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388411 |
Aug 15, 1973 |
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Current U.S.
Class: |
15/309.2;
209/394; 209/466 |
Current CPC
Class: |
C10B
57/005 (20130101); B07B 4/08 (20130101) |
Current International
Class: |
C10B
57/00 (20060101); B07B 4/08 (20060101); B07B
4/00 (20060101); A47L 005/14 () |
Field of
Search: |
;209/394,466
;15/308,303,36R,36B |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Feldman; Peter
Assistant Examiner: Moore; C. K.
Attorney, Agent or Firm: Holman & Stern
Claims
What is claimed is:
1. A device for dedusting loose materials, comprising: an inclined
trough having side walls, a top and a bottom along which loose
material travels downwards; a lower opening in the bottom of said
trough; an upper opening in said top above the lower opening; a
slot type grate mounted in said lower opening, said grate including
separate parallel strips, the top surfaces of said strips being
arranged in a descending step-like fashion perpendicular to the
longitudinal axis of said trough for transferring the material
step-by-step across said lower opening to the lower side thereof,
said strips being mounted for simultaneous rotation about the
longitudinal axes thereof to adjust the width of slots provided
between and formed by said strips; a duct outlet connected to said
lower opening to deliver compressed air from a source to the inner
space of said trough via the slots between said strips of the
grate; a source of suction connected to said upper opening to
extract the mixture of air with dust particles of bulk material
from the inner space of said trough, with the mixture being created
when an upward flow of compressed air passes through the bed of
material travelling across said strips and slots along the
trough.
2. The device according to claim 1, wherein the simultaneous
rotation of the strips of the grate is effected by means of levers,
each lever having one end rigidly connected to a corresponding
strip at the rotative axis thereof and with the other end pivotally
connected to a bar installed in parallel to the bottom of the
trough for reciprocating motion in relation to the trough to adjust
the width of the slots between the strips of the grate.
3. The device according to claim 2, wherein the reciprocating
motion of the bar is effected by a hydraulic cylinder-piston unit
whose cylinder is pivotally connected via its end to a lower
surface of the trough bottom, while its piston is pivotally
connected to the end of the bar.
Description
BACKGROUND OF THE INVENTION
The present invention relates to the by-product coke industry and
more particularly to a device for dedusting loose materials, such
as coke, when carried by conveyors.
PRIOR ART
There are known devices for dedusting loose materials, comprising
an inclined trough along which these materials travel downwards by
gravity. The bottom of the trough has an opening closed by a grate
under which a duct outlet is installed to deliver compressed air
from an appropriate source to the inner space of the trough
underneath the grate.
The top portion of the trough has an opening with a duct inlet
installed above the trough to extract the mixture of air and dust
particles of loose material carried away by air.
The grate in these devices is essentially a perforated surface
which, in the course of operation, is vibrated to facilitate the
dust removal from the device. One of the disadvantages of such
devices is that at a sudden shut-down of compressed air delivery,
the openings of the perforated grate become clogged with lumps of
loose material and the duct outlet delivering the compressed air is
also choked by lumps of material falling through the grate
openings.
Moreover, the known devices are devoid of a possibility of
adjusting the size of the grate openings to vary the compressed air
flow parameters which narrows the range of their application.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the present invention is to provide a device for
dedusting loose materials with such a grate and whose design
prevents the clogging thereof with lumps of the material being
dedusted and also the choking of the compressed air delivery inlet
even at a sudden shut-down of the compressed air delivery, which
result in the improved operating characteristics of the device as
the whole.
Another object of the present invention is to provide control over
the compressed air flow parameters by varying the ability of the
grate to pass air therethrough for dedusting loose materials of a
different granular composition.
These and other objects are achieved due to the provision of a
device for dedusting loose materials travelling therethrough
downwardly along an inclined covered trough having in its bottom an
opening provided with a grate to effect communication between the
inner space of the trough with a duct outlet connected to the
bottom thereof to deliver compressed air underneath the grate,
while the top portion of the trough has an opening provided with a
duct inlet to extract the mixture of air with dust particles of
materials, with said mixture being created when an upward flow of
compressed air passes through the bed of loose material.
According to the invention, the grate is of a slotted type and
composed of separate and parallel strips positioned in a step-like
fashion perpendicular to the longitudinal axis of the trough and
installed for a possible simultaneous turning in relation to their
longitudinal axes to adjust the width of the slots between these
strips.
This step-like arrangement of the strips of the grate allows the
loose material, in the course of its travel along the inclined
trough, to flow successively from one strip down to another without
falling into the slots between the strips even at a sudden
shut-down of the compressed air delivery underneath the grate.
This finally results in the improved performance of the dedusting
device as no extra time is required to clean the grate and the air
delivery outlet from lumps of materials trapped therein.
In addition, the step-like arrangement of the strips of the grate
makes the material more loose to improve the dedusting
efficiency.
It is also necessary to take into account that the positioning of
the strips of the grate for possible adjustment of the width of the
slots between the strips permits a varying of the clear slot area
of the grate to control the flow rate of compressed air delivered
into the trough, depending on the amount of loose material to be
dedusted and its granular composition.
The turning of the grate strips is conveniently effected by means
of levers with one end of each of levers being rigidly connected to
the axle of the corresponding strip, while the other end thereof
being pivotally connected to a common bar installed in parallel to
the trough bottom for possible reciprocating motion thereof with
respect to the trough when the width of the slots between the
strips is being adjusted.
This feature allows the width of the slots between all the strips
of the grate to be adjusted simultaneously.
The turning of the strips may be effected by a hydraulic piston
unit with its body pivotally connected at its end to the lower
surface of the trough bottom and with its bar pivotally connected
to the end of the rod.
The strips of the grate are top-faced with an abrasion-resistant
material to prolong their service life.
A specific embodiment of the present invention will now be
described in detail with reference to the accompanying drawings, in
which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal sectional view of the coke dedusting
device; and
FIG. 2 is a view taken along the arrow A of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
The coke dedusting device comprises an inclined top-covered trough
1 (FIG. 1) for a gravity flow of coke. A bottom 2 of the trough 1
has an opening in which a slot type grate 3 is installed. Secured
below the grate 3 to the bottom 2 of the trough 1 is a duct outlet
4 connected to the delivery port of a blower 5 installed therebelow
to deliver compressed air into the inner space of the trough 1
through the slots in the grate 3.
Installed in an opening formed in a cover or top portion 6 of the
trough 1 above the grate 3 is a duct inlet 7 connected, via a dust
collecting device (not shown), to an upper blower 8 for extracting
the mixture of air with dust particles of coke from the inner space
of the trough above the bed of loose material lying on the grate
3.
The grate 3 is of the slot type, composed of separate and parallel
to strips 9, with the strips being rectangular in shape. These
strips 9 are arranged one-above-the-other in a step-like succession
and perpendicular to the longitudinal axis of the trough 1 so that
longitudinal slots 10 are left between the longitudinal edges of
the strips.
Connected to each strip 9 of the grate 3 along the geometric axis
thereof is a longitudinal axle 11 whose ends are mounted in
bearings 12 (FIG. 2) fixed in side walls 13 of the trough 1.
One of the ends of the axle 11, protruding beyond the limits of the
trough 1 is rigidly connected to a lever 14 and the opposite end of
the lever is pivotally connected to an inclined bar 15 which is
common for all the levers 14 and the bar is positioned in parallel
to the bottom 2 of the trough 1.
This bar 15 has one end thereof connected to a rod 16 of a
hydraulic cylinder piston unit whose body, 17 through its end is
pivotally connected to the underside of the bottom 2 of the trough
1.
For longer surface life, the strips 9 of the grate 3 are faced on
the top with a abrasion-resistant material 18, say diabase (igneous
rock);
The device operates as follows;
The flow of coke during its downward travel along the bottom of the
inclined trough 1 reaches the strips 9 of the grate 3 and
successively transfers from each upper strip 9 to the next lower
strip without falling into the slots 10 therebetween because of a
certain travel speed of the coke flow.
When the blowers 5 and 8 are actuated the flow of compressed air
from the delivery port of the lower blower 5 via the duct outlet 4
passes upwards through the slots 10 of the grate 3 and at the
moment the coke is transfering from one strip 9 to another the air
takes away fine dust particles of coke to the upper duct inlet 7
connected to the intake port of the upper blower 8.
To protect this blower 8 against premature wear, dust-laden air
passes through a dust collecting device before reaching the
blower.
For more efficient extraction of dust, the volume rate of air drawn
in by the upper blower 8 should exceed the volume rate of air
delivered by the lower blower 5.
The compressed air flow parameters, depending on the granular
characteristics of coke, can be controlled (beside varying the
rotational speed of the blower 5) by adjusting the width of the
slots 10 between the strips 9 of the grate 3.
For this purpose, the hydraulic cylinder is actuated and its rod 16
moves the bar 15 which turns the levers 14 through an equal angle.
The levers 14 turn the axles 11 of the strips 9 of the grate 3 and
consequently the strips 9 themselves, thus altering the width of
the slots therebetween.
The present device raises the code dedusting efficiency to improve
working conditions in production buildings in which coke is
processed.
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