close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3025878

код для вставки
March 20, 1962
J. N. AD COCK
3,025,865
APPARATUS FOR COOLING HOT METAL STRIP OR
PLATE BY LAMINAR LIQUID FLOW
Filed Dec. 2, 1957
4 Sheets-Sheet 1
FIZ
Inventor
305 EPH NOEL' ADcocK
Attorneys
March-20, 1962
J. N. ADCOCK
APPARATUS FOR COOLING HOT METAL STRIP OR
3,025,865
PLATE BY LAMINAR LIQUID FLOW
Filed Dec. 2, 1957
4 Sheets-Sheet 2
Inventor
DOSEPH NOEL ADCOCK
B
A ttorneyg
March 20, 1962
J. N. ADCOCK
APPARATUS FOR COOLING HOT METAL STRIP 0R
PLATE BY LAMINAR LIQUID FLOW
Filed Dec. 2, 1957
3,025,865
4 Sheets-Sheet 5
l
l
1
I
I
l
I
|
-'\
_, |
I (1231:)?
.01’. (10‘
f n, ‘PT-Mfg‘:
(A w
F/G.4
:4
_
p:>/l
i
|
'
v
:/
|
I
|
|
|
|
|
41'
|
2’
‘
Inventor
DOSEPH NOEL AbgocK
BWEWHMMX
Attorneys
March 20, 1962
J. N. ADcocK
APPARATUS FOR COOLING HOT METAL STRIP OR
PLATE BY LAMINAR LIQUID FLOW
Filed Dec. 2, 1957
3,025,865
4 Sheets-Sheet 4
JOSEPH NOEL ADCOCK
O
.
By
.A
Attorneys
United States Patent 0
3,025,855
Patented Mar. 20, 1962
1
3 025,865
APPARATUS FOR CUULING HOT METAL STRIP
0R PLATE BY LAMINAR LIQUID FLOW
Joseph Noel Adcock, Moorgate, Rotherham, England, as
signor to The United Steel Companies Limited, Shef
field, England
Filed Dec. 2, 1957, Ser. No. 700,011
9 Claims. (Cl. 134-422)
2
In addition, in the accompanying drawing FIGURE 5
is a diagram of a rolling mill equipped with apparatus
according to the invention.
In the apparatus shown in FIGURE 1 the liquid con
tainer is a metal box 3, and there are 20 syphon tubes 1
in it. The inlet ends of the syphon tubes alternate at
the opposite sides of the box, as shown in FIGURE 3,
and lie just so far above the bottom 2 of the box as to
ensure that water can always enter them without obstruc~
This invention relates broadly to the cooling of hot 10 tion.
metal strip or plate.
The discharge ends of the tubes 1 are brazed in holes
When steel is rolled into strip or plate it emerges hot
in the plate 2, which is recessed on its underside, as shown
from the rolling mills and is commonly cooled by water
in FIGURE 4. The tubes 1 are maintained in a rigid
sprayed onto it. The water splashes on impinging onto
vertical position by means of a stay plate 4. The tops
the strip or plate.
15 or bends of the syphon pipes are maintained at an equal
It is possible to prevent the water from splashing, even
distance from the bottom plate 2.
though it may ?ow as jets from nozzles situated several
Water is supplied through an inlet 5 of circular cross
feet above the strip. What is required is to make the
section and a baffle plate 6 is interposed between the
jets assume parallel laminar form. By “parallel laminar
inlet 5 ‘and the tubes 1 and is perforated to allow water to
form” we means a non-turbulent jet in which the mole 20 ?ow through it. The box is closed at the top, except for
cules of the liquid are all moving substantially at the
an air vent 7, and a sight glass 8 is incorporated in the
same velocity and in straight parallel lines with respect
side to indicate the water level.
to each other. This kind of jet is characterised by its sim
In operation the water is turned on at a predetermined
ilarity in appearance to a clear glass rod, and on im
rate of flow and rises in the box 3 until the level in the
pingement upon a plane surface the liquid disperses along 25 box is higher than the top of the syphon bends. There
the surface without any substantial splash.
upon the syphons establish themselves and the water
One object of my invention is to cool hot metal strip
level in the box rapidly falls until the discharge head, i.e.
or plate without splash.
the depth of water in the box measured from the surface
Another object of my invention is to provide an ap
of the water to the discharge ends of the syphon tubes, is
paratus for producing a plurality of jets of liquid in 30 su?'icient to give a total discharge through the syphons
parallel laminar form.
equal to the amount of water entering the box. This
A further object of my invention is to provide improved
discharge is self-adjusting.
cooling means in a rolling mill.
The entering water is free of entrained ‘air, and turbu
I have found that I can produce jets ?owing in parallel
lence is reduced by the ba?le plate 6.
35
laminar form by causing the liquid to ?ow to a nozzle
The box shown in FIGURE 1 is suitable for installa
through a suf?cient length of smooth bore pipe to give
tion in a ?xed position.
direction and straightness to the stream, and by using a
In a rolling mill, the hot strip or plate leaving the last
low operating head to ensure the absence of turbulence.
mill stand travels horizontally along a roller rack. For
I have further found that the requirements are satis?ed
cooling strip or plate by means of the invention, boxes
by discharging the liquid through syphon tubes, one to
are arranged in succession above the rack with their
each jet.
short sides parallel to the centre line of the rack and their
One feature of this invention is the cooling of hot
long sides extending across it, each box being of such
metal strip or plate by jets of water moving downwards
dimensions and containing so many syphon tubes as to
from syphon tubes onto the strip or plate in parallel
project jets over the whole width of the strip or plate.
laminar flow.
45
One such arrangement .is shown diagrammatically in
Another feature of this invention is an apparatus for
FIGURE 5, the last mill stand being shown at 15 and the
producing a number of jets of water or other liquid in
roller rack at 16, and the direction of movement of the
parallel laminar form, this apparatus comprising a liquid
strip being indicated by an arrow. The jets are indicated
container and a number of syphon tubes mounted in the
at 17.
container with their suction legs terminating a little dis 50
Now strip travels at high speed and does not always
tance above the bottom of the container, their discharge
lie ?at. Sometimes, the leading end will raise itself into
legs passing in liquid-tight fashion through the bottom of
the air and sometimes a loop will form in the strip as it
the container, and their tops lying below the top of the
travels along. In either case, the leading edge of the
container, so that on ?lling the container all the syphon
strip or the crest of the loop could rise suf?ciently to come
tubes will be flooded and simultaneous ?ow will begin 55 into contact with the boxes. To prevent the boxes being
through each. To ensure that the liquid flows satisfac
damaged their bottoms are made of thick plates, and it is
torily in parallel laminar form the discharge leg of each
for the same reason that the plates forming the bottoms
syphon tube should have a straight length of at least 12
are recessed. In addition each plate 2 is secured in posi
times its diameter, and I prefer to make this length 16
60 tion by countersunk screws.
times the diameter.
The boxes may advantageously be spaced somewhat
Some apparatus according to the invention are shown
in the drawings accompanying the provisional speci?ca
apart from one another as shown in FIGURE 5. If each
one syphon tube.
as shown at 14, so as to present an inclined surface to the
box had a bottom plate just equal to the width of the
tion, in which—
box there would be such a gap between adjacent boxes
FIGURE 1 is a longitudinal section through one ap
65 that the leading edge of the strip might become trapped in
paratus;
it. To avoid this, the plates 2 may advantageously pro
FIGURE 2 is a longitudinal section through another
ject out from each box to form ?anges as shown in
apparatus;
FIGURES 3 and 5, so that the plates of adjacent boxes
FIGURE 3 is a transverse section on the line III-III
in each of FIGURES 1 and 2;
almost touch one another. Further, the ?ange projecting
FIGURE 4 is an enlarged view of the discharge end of 70 towards the oncoming strip is slightly turned upwards,
speaeee
A
4.
In
a
rolling
mill
having
a plurality of mill stands,
leading edge of the strip if this should strike the under
the combination of a roller rack for hot strip or plate
side of the plate.
leaving the last mill stand, and a plurality of apparatus
If each box must be easily moved out of its operating
arranged in succession above said rack to project jets of
position, so as to give access to the roller rack or for
any other reason, it may be mounted to swing, as shown GI liquid over the whole width of strip or plate travelling
along said rack, each of said apparatus comprising a con
in FIGURE 2. In this apparatus the water inlet is a
3
tainer for liquid and means comprising a plurality of
parallel syphon tubes each having a suction leg terminat
closed trough 9 leading from ‘an open-topped tundish 10'.
The box is pivoted at 11 on a circular shaft holding several
ing in the container to discharge liquid from said con
tainer as jets moving downwards in parallel laminar ?ow.
boxes. The boxes may be swivelled vertically either by
rotation of the pivot shaft or by rotation of the box upon
the shaft, and the box is maintained in a level working
position by abutment upon a rigid structure at 12.
Water is introduced into each box by means of a pipe
‘13 which projects downwards into the tundish to give a
5. A combination as claimed in claim 4 in which the
containers are spaced apart from one another and their
bottoms have ?anges which substantially close the gaps
‘between adjacent containers.
submerged delivery, and the quantity of water ?owing 15
through the box is governed by a valve in a supply pipe
line. Air entrained during the introduction of the water
into the tundish is removed during the passage of the water
along the trough 9, assisted by the action of the baf?e
plate 6.
I claim:
1. An apparatus for feeding cooling liquid comprising
is turned upwards to present an inclined surface to the
leading edge of the strip.
7. A combination as claimed in claim 4 in which the
20 containers are mounted to rock about an axis parallel to
the centre line of the roller rack so that they can be swung
outof the operating position.
'
a container for liquid and means for producing a number
of jets of liquid in parallel laminar form, comprising a
plurality of parallel siphon tubes mounted in said con
tainer, the suction leg of each tube terminating at small
distance above the bottom of said container, the discharge
leg of each tube passing in liquid-tight fashion through
the bottom of said container and the top of each tube 30
lying below the top of the container, and means to feed
Water to the container at a rate at least equal to the low
est rate of continuous discharge of said tubes determined
by the lowest Water level in the container permitting con
tinuous ?ow so as to maintain continuous discharge 35
through all the tubes.
2. An apparatus as claimed in claim 1 in which the
discharge leg of each syphon tube has a straight length of
at least 16 times its diameter.
3. An apparatus as claimed in claim 1 in which the 40
container has a liquid inlet in one wall and a perforated
batlle plate is interposed between the inlet and the syphon
tubes.
6. A combination as claimed in claim 5 in which on
each container a ?ange projecting towards oncoming strip
8. A combination as claimed in claim 7 in which each
container is rigid with an open tundish to which cooling
water is supplied and from which it enters the container.
9. A combination as claimed in claim 4 in which the
syphon tubes in each apparatus are arranged in at least
one line transverse to the longitudinal axis of the roller
rack.
References Cited in the ?le of this patent
UNITED STATES PATENTS
858,522
974,336
1,998,192
2,536,208
Low __________________ __ July 2,
Alt __________________ __ Nov. 1,
Haswell _____________ __ Apr. 16,
Nystrom ______________ __ Jan. 2,
1907
1910
1935
2,628,924
2,696,823
2,702,042
1951
Johnston _____________ __ Feb. 17, 1953
Scott ________________ __. Dec. 14, 1954
Smith _______________ __ Feb. 15, 1955
2,828,761
Weibert ______________ __ Apr. 1, 1958
Документ
Категория
Без категории
Просмотров
0
Размер файла
364 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа