Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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Background of the Invention.
This invention relates to a slide rotary nozzle having
a bottom plate brick and a sliding plate brick and mounted
in a ladle for pouring of molten steel. More particularly,
it relates to such slide rotary nozzle in which said brick
plates are arranged as door plates.
In a slide rotary nozzle of the prior art, in which the
bottom plate brick is fixed, the fixed plate brick has a
single nozzle opening, while -the sliding plate brick has
two nozzle openings, and the sliding plate brick may be
rotated for bringing one of its nozzle openings into register
with the nozzle opening in the bottom plate brick for pouring
of molten steel through the registered nozzle openings.
The sliding plate brick is designed as a door and may be
swung open for exposure of the sliding surfaces for visual
inspection of the damaged state of the two plate brick
surfaces and occasional exchange of the damaged plate bricks.
The bottom and sliding plate bricks are exchanged as one set
when one of the plate bricks has become worn through use.
In the conventional sliding rotary nozzle, the single
nozzle in the bottom plate brick is used in conjunction with
two nozzles in the sliding plate brick and thus the bottom
plate brick may be worn out more promptly than the sliding
plate brick. Hence, the sliding plate brick has to be
exchanged with the worn out bottom plate brick while as yet
the sliding plate brick is in usable state.
In addition, since the nozzle in the fixed plate brick
is received in an upper nozzle socket in the conventional
dev.ice, the bottom plate brick must be removed for exchange
of the worn out upper nozzle, and the bottom plate brick
thus removed must be discarded.
Summary of the Invention.
An object of the present invention is to provide
a dual door type rotary nozzle which is free of the above
defects of the prior art device and in which the bottom plate
brick is designed as rotary plate brick which may be used more
effectively for extending the service life of the nozzle and
thereby extending the exchange time intervals of the bottom
plate brick and the sliding plate brick.
Another object of the present invention is to
provide a dual door type rotary nozzle wherein the upper nozzle
may be exchanged while the bottom plate brick is mounted in
position.
In the dual door type rotary nozzle of the present
invention, the bottom and sliding plate bricks respectively
have plural nozzle openings, the slidlng plate brick being
rotatable and disposed under the bottom plate brick, the
bottom and sliding plate bricks being swingably mounted for
opening and closing in a dual door configuration, the bottom
plate brick housed in and rotatably carried by a receiver metal
fixture, which in turn is carried by one side of a base plate
havi.ng a recess for housing the bottom plate brick, the sliding
plate brick housed in and rotatably carried by a sliding plate receiver-
rotor metal fixture which in turn is carried by the other side
of the base plate.
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According to the present invention, the bottom
plate brick in the conventional device is replaced by a bottom
plate brick having a plurality of, for example, two nozzle
openings, so that, in case o~ injury to one nozzle opening,
the remaining nozzle opening may come into use, thus enabling
the bottom plate brick to be used more effecti.vely
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for extendin~ the sexvice life of the nozzle.
Moreover, according to ~he present invention, not only
the sliding plate brick but also the bottom plate brick may
be swung open as door plates. The lower surface of the
bottom plate brick is slidable relative to the sliding piate
brick, while the upper surface of the bottom plate brick is
fitted in the recess in the upper nozzle socket and would be
unable to be rotated for exchange of the nozzle openings.
However, due to the double door structure described in the
Eoregoing, the upper nozzle and the bottom plate brick may
be in contact with or swung away fromjjeach other. Thus the
bottom plate brick may be rotated w~ it is separated
from the upper nozzle for enabling smooth changeover from
one to the other nozzle opening.
With the bottom plate brick arranged as do~r, it may
be disengaged from the upper nozzle socket-~iLst it is
swung open so that the upper nozzle may be exchanged without
regard to the bottom plate brick thus eliminating the
necessity to discard the usable bottom plate brick as in the
conventional practice.
The above and other advantages of the present invention
will be more fully understood by the following description
which is made in con~unction with the accompanying drawings.
Brief Description of the Drawings.
Fig. 1 is a perspective view, as seen from below, of
the dual door type rotary nozzle of the present invention
-- 4
n the opened state.
Fig. 2 is an enlarged partial view of a portion
A in Fig. 1.
Fig. 3 is a schematic view showing the right-hand
side of a bottom plate receiver metal fixture of Fig. 1.
Fig. 4 is a view looking in the direction of
the arrows IV - I~ of Fig. 3.
Fig. 5 is a schematic view showing the bottom
plate brick receiver metal fixture being locked in rotation.
Fig. 6 is a cross-sectional view of a dual ~oor
rotary nozzle according to the present invention with both
doors in the closed position.
Fig. 7 is a cross-sectional view similar to that
of Fig. 6 but with both doors i.n the open position.
Description of the Preferred Embodiment.
In Fig. 1, numeral 1 denotes a base plate having
a central recess 3 in which a rotary plate brick receiver
metal fixture 2 may have a snug fit when the metal fixture 2
is closed upon the base plate 1. The receiver metal fixture 2
is swingably carried by a shaft 4 to one side of the base plate
1 as shown in detail in Fig. 2, and is snugly received in the
recess 3 when swung to the closed position. In this position,
a socket 6 of a bottom plate brick 5 secured to the metal fixture
2 coincides with a socket of an upper nozzle UN shown in Fig. 1~
A slide plate receiver - rotor metal fixture 7 is used for hous-
ing a slide plate brick 8 and for rotating said brick 8. The
metal fixture 7 is swingably carried to the other side of the
base plate 1 by a shaft 9 which is used simultaneously as rota-
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~ional locking means. The metal fixture 7 is so designed andconstructed that, when the fixture 7 is brought to a closed
position in
~,
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contact with the receiver metal fixture 2, a slide plate
brick 8 secured to the metal fixture 7 is superimposed on
the bottom plate brick 5 secured to the receiver mekal
~ixture 2 and that, when the slide plate brlck is slid in
rotational movement, no interstices may be formed between
the two plate brick surfaces.
In Fig. 1, through-hole 8A is bored in -the slide plate
bric~ 8. A locking pin 9 is used for locking the receiver
rotor metal fixture to the base plate 1 against incidental
opening when the receiver - rotor metal fixture has been
closed. A rotor unit 11 is provided with gearing and used
for halting or rotating said receiver - rotor metal fixture
7 as the occasion may demand. An intermediate gear is used
for transmitting an external driving power to the unit 11
and is designed for meshing with a gear, not shown, of an
electric motor or other prime mover, also not shown.
In Figs.3 to 5, showing the receiver metal fixture
2 in detail. rotational means 13 is designed to rotate the
bottom plate brick 5 and comprises a number of circumferential
pin slits 13 A at a substantially constant pitch on the plate
brick 5. A separate operating rod 14 may be engaged in said
pin slits 13 through a peripheral cut-out in the receiver
metal fixture 2 and rotationally operated by an operator in
the direction shown by the arrow mark 15 in Figs. 3 and 4 or
in the opposite direction for rotating the bottom plate bric~
~ which is housed in the metal fixture 2. After completion
of the rotation of the plate brick 5 to -the desired angular
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-- 6 --
16
position, a locking eIement 16 in the form of a se~mental
gear shown in ~ig. 16 may be engaged into the pin slits ]3
through the peripheral cut-out ir. the metal fixture 2 for
securing the plate brick 5 in such angular posi-tion.
In the dual door type rotary nozzle of the present
invention, the degree of injury to each plate brick may be
advantageously checked by visual inspection similarly to the
prior-art door type rotary nozzle. In addition, the rotary
plate brick S has two nozzle openings fitted respectively
~V with sockets 6 which may be brought into register with the
socket of the upper nozzle UN. Thus, in case of injury of
one of these nozzle openings, the operating rod 14 may be
engaged into one of the pin slits 13 A in the receiver metal
fixture 2 as shown in Figs. 3 and 4 for rotating the rota-
tional means and hence the bottom plate brick 5 in the
direction of the arrow lark 15. When the remaining unused
nozzle opening is in register with the upper nozzle Ul~, the
locking element 16 is mounted in meshing with the pin slits
13A as shown in Fig. 5 for locking the bottom plate brick
5 in rotation. Then, the bottom plate receiver metal fixture
2 is closed on the base plate 1, and the receiver-rotor
metal fixture 7 is then closed on the receiver metal fixture
2. The metal fixutres 2, 7 may then be locked by the
operation of the locking pin 10 and the shaft 9. The
slide plate brick 8 may now be driven as desired by actuation
of the electric motor for driving the rotor unit 11.
In practial execution of the inventive dual door type
rotary nozzle, it has been shown that the service life of a
vtd~
set of pl~te brioks used in a ~OO-ton ~adle can be extended
from five chaxges in the conventional practice up to at least
six charges.
