Field
[0001] The present invention relates to a jig for
mounting an upper nozzle and a method of mounting an upper
nozzle for inserting and mounting an upper nozzle into an
upper nozzle insertion port in a sliding nozzle device that
is mounted on a bottom surface of a molten metal container
having an upper nozzle insertion port on a bottom part
thereof, and controls a flow rate of a molten metal.
Background
[0002] There is known a sliding nozzle device that is
mounted on a bottom surface of a molten metal container
such as a tundish and a ladle to control a flow rate of a
molten metal. For example, as disclosed in Patent Document
1, the sliding nozzle device includes an upper nozzle that
is inserted into an upper nozzle insertion port disposed at
a tuyere brick of the molten metal container, and an upper
plate disposed under the upper nozzle. Typically, after
refractory mortar is applied to an outer circumference of
the upper nozzle, the upper nozzle is inserted and mounted
into the upper nozzle insertion port disposed at the tuyere
brick of the molten metal container.
Citation List
Patent Document
[0003] Patent Document 1: JP 2009-241076A
Summary
Technical Problem

[0004] In a case in which an amount of the refractory
mortar applied to the outer circumference of the upper
nozzle is large, a large amount of refractory mortar
remains in the sliding nozzle device at the time of
mounting the upper nozzle in some cases. If the upper
plate is mounted on the sliding nozzle device in such a
state in which a large amount of refractory mortar remains,
a level difference is generated due to the refractory
mortar between the upper nozzle and the upper plate, and as
a result, inclination of the upper plate is caused. In
such a case, a load tends to be applied to the upper plate,
and the upper plate may be rapidly worn out.
[0005] An object of the present invention is to provide
a jig for mounting an upper nozzle and a method of mounting
an upper nozzle that can reduce the refractory mortar that
remains in the sliding nozzle device at the time of
mounting the upper nozzle.
Solution to Problem
[0006] According to the present invention, a jig for
mounting an upper nozzle and a method of mounting an upper
nozzle as described below are provided.
(1) A jig for mounting an upper nozzle, the jig being
detachable from an upper plate storage part of a sliding
nozzle device, the sliding nozzle device being mounted on a
bottom surface of a molten metal container having an upper
nozzle insertion port at a bottom part, and including the
upper plate storage part and a through hole disposed on the
upper plate storage part to communicate with the upper
nozzle insertion port, the jig including:
a base plate that is able to cover at least a
periphery of the through hole on a bottom surface of the
upper plate storage part, in which

an opening is disposed on the base plate, and the
opening has a diameter larger than a diameter of the
through hole.
(2) The jig for mounting an upper nozzle according to (1)
described above, in which an outer wall is disposed on an
outer circumference of the base plate.
(3) The jig for mounting an upper nozzle according to (1)
or (2) described above, in which a difference between the
diameter of the opening and the diameter of the through
hole is equal to or smaller than 30 mm.
(4) The jig for mounting an upper nozzle according to any
one of (1) to (3) described above, in which the base plate
includes an engaging part, and the bottom surface of the
upper plate storage part includes a part to be engaged with
which the engaging part is engaged.
(5) The jig for mounting an upper nozzle according to any
one of (1) to (3) described above, in which the bottom
surface of the upper plate storage part includes an
engaging part, and the base plate includes a part to be
engaged with which the engaging part is engaged.
(6) The jig for mounting an upper nozzle according to any
one of (1) to (5) described above, in which a magnet is
disposed on the base plate, and a ferromagnetic material
corresponding to the magnet is disposed on the upper plate
storage part.
(7) The jig for mounting an upper nozzle according to any
one of (1) to (5) described above, in which a magnet is
disposed on the bottom surface of the upper plate storage
part, and a ferromagnetic material corresponding to the
magnet is disposed on the base plate.
(8) The jig for mounting an upper nozzle according to any
one of (1) to (5) described above, in which a magnet is
disposed on the base plate, and the upper plate storage

part is made of a ferromagnetic material corresponding to
the magnet.
(9) The jig for mounting an upper nozzle according to any
one of (1) to (5) described above, in which a magnet is
disposed on the upper plate storage part, and the base
plate is made of a ferromagnetic material corresponding to
the magnet.
(10) The jig for mounting an upper nozzle according to any
one of (1) to (9) described above, further including a
grip.
(11) The jig for mounting an upper nozzle according to any
one of (1) to (10) described above, in which a mortar
receiver is disposed on the base plate, and the mortar
receiver is opened on a side of the opening of the base
plate.
(12) A method of mounting an upper nozzle for a sliding
device that is mounted on a bottom surface of a molten
metal container having an upper nozzle insertion port at a
bottom part, and includes an upper plate storage part and a
through hole disposed on the upper plate storage part to
communicate with the upper nozzle insertion port, the
method including:
a first step of mounting a jig on the upper plate
storage part, the jig including a base plate that covers at
least a periphery of the through hole on a bottom surface
of the upper plate storage part, and having an opening
disposed on the base plate and having a diameter larger
than a diameter of the through hole; and
a second step of inserting an upper nozzle to which
refractory mortar is applied into the upper nozzle
insertion port via the through hole.
(13) The method of mounting an upper nozzle according to
(12) described above, in which

an engaging part is disposed on one of the bottom
surface of the upper plate storage part and the base plate,
and a part to be engaged with which the engaging part is
engaged is disposed on the other one of the bottom surface
and the base plate, the method further including:
a third step of engaging the engaging part with the
part to be engaged to position the jig with respect to the
upper plate storage part between the first step and the
second step.
Advantageous Effects of Invention
[0007] According to the present invention, the
refractory mortar that remains in the sliding nozzle device
can be reduced.
Brief Description of Drawings
[0008] FIG. 1 is a perspective view of a sliding nozzle
device that uses a jig for mounting an upper nozzle
according to an embodiment of the present invention (in a
state in which the sliding nozzle device is opened).
FIG. 2 is a cross-sectional view illustrating a use
state of the sliding nozzle device in FIG. 1.
FIG. 3 is a perspective view of a principal part of
the sliding nozzle device in FIG. 1.
FIG. 4 is a perspective view of a front surface side
of the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 5 is a perspective view of a back surface side of
the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 6 is a perspective view of a principal part of
the jig for mounting an upper nozzle according to the
embodiment of the present invention.

FIG. 7 is a perspective view of the principal part of
the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 8 is a perspective view illustrating a use state
of the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 9 is a perspective view illustrating a use state
of the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 10 is a perspective view illustrating a use state
of the jig for mounting an upper nozzle according to the
embodiment of the present invention.
FIG. 11 is a perspective view illustrating a state in
which the upper nozzle is mounted by using the jig for
mounting an upper nozzle according to the embodiment of the
present invention, and the jig for mounting an upper nozzle
is dismounted thereafter.
Description of Embodiments
[0009] The following describes an embodiment of the
present invention in detail based on the drawings.
FIG. 1 illustrates a sliding nozzle device 3 that uses
a jig for mounting an upper nozzle according to an
embodiment of the present invention.
Mounting of an upper nozzle and an upper plate
described above is performed in a state of putting the
sliding nozzle device 3 in a vertically standing state, so
that FIG. 1, and FIG. 3 and FIGS. 8 to 11 (described later)
illustrate the sliding nozzle device 3 in a vertically
standing state. In the present specification, upper and
lower directions in FIG. 1 are respectively assumed to be
an upper side and a lower side.
[0010] As illustrated in FIG. 1 and FIG. 2, the sliding
nozzle device 3 is disposed on a bottom surface of a molten

metal container 2.
The molten metal container 2 according to the present
embodiment is a container that houses a molten metal.
Examples of the molten metal container 2 include a ladle
and a tundish, and examples of the molten metal include
iron, copper, and aluminum. An upper nozzle insertion port
21 is formed on a bottom part of the molten metal container
2. The upper nozzle insertion port 21 is a hole passing
through the molten metal container 2 from an internal space
thereof to the outside.
[0011] The sliding nozzle device 3 according to the
present embodiment includes a fixed metal frame 4, an
openable metal frame 5 (not illustrated in FIG. 2) disposed
to be openable with respect to the fixed metal frame 4, a
slide metal frame 6 disposed on the openable metal frame 5,
an upper nozzle 7 (not illustrated in FIG. 1), and a lower
nozzle 8 (not illustrated in FIG. 1). The fixed metal
frame 4 includes a lock mechanism 47 that maintains a state
of closing the slide metal frame 6.
[0012] As illustrated in FIG. 2, nozzle holes 71 and 81
through which a molten steel passes are formed on the upper
nozzle 7 and the lower nozzle 8. The upper nozzle 7 is
fixed to the fixed metal frame 4. Part of the upper nozzle
7 is inserted into the upper nozzle insertion port 21 of
the molten metal container 2. Although not illustrated,
the lower nozzle 8 is fixed to the openable metal frame 5.
[0013] The fixed metal frame 4 and the slide metal frame
6 are plate-shaped members having a substantially
rectangular shape. The fixed metal frame 4 is fixed to the
bottom surface of the molten metal container 2 with a bolt
(not illustrated). The slide metal frame 6 is disposed in
a slidable manner with respect to the fixed metal frame 4.
A storage part for storing a plate is formed in an

inner part of each of the fixed metal frame 4 and the slide
metal frame 6.
In the present embodiment, a storage part disposed in
the fixed metal frame 4 is assumed to be an upper plate
storage part 41, and a storage part disposed in the slide
metal frame 6 is assumed to be a lower plate storage part
61. A plate stored in the upper plate storage part 41 is
assumed to be an upper plate 42, and a plate stored in the
lower plate storage part 61 is assumed to be a lower plate
62.
Plate holes 421 and 621 are disposed on the upper
plate 42 and the lower plate 62, respectively.
The upper plate 42 and the lower plate 62 are not
illustrated in FIG. 1 and FIG. 3 (described later).
[0014] As illustrated in FIG. 3, a through hole 43,
magnets 44, recessed parts 45, and a mounting part 46 are
disposed on a bottom surface of the upper plate storage
part 41.
[0015] When the upper plate 42 is mounted on the upper
plate storage part 41, the plate hole 421 of the upper
plate 42 communicates with the through hole 43 of the upper
plate storage part 41. When the lower plate 62 is mounted
on the lower plate storage part 61, the plate hole 621 of
the lower plate 62 communicates with the through hole of
the lower plate storage part 61.
[0016] The through hole 43 of the upper plate storage
part 41 communicates with the upper nozzle insertion port
21 of the molten metal container 2. The upper nozzle 7 is
inserted into the upper nozzle insertion port 21 in a state
in which the upper plate 42 is not mounted on the upper
plate storage part 41. Thus, to insert the upper nozzle 7
into the upper nozzle insertion port 21, the upper nozzle 7
is inserted through the through hole 43 of the upper plate

storage part 41.
[0017] The recessed parts 45 are each a circular
indentation disposed on the bottom surface of the upper
plate storage part 41. Two recessed parts 45 are disposed
on the bottom surface of the upper plate storage part 41.
[0018] A plurality of magnets 44 are disposed on bottom
surfaces of the upper plate storage part 41.
[0019] The mounting part 46 is a semicircular
indentation disposed on a periphery of the through hole 43
of the upper plate storage part 41. A fixture 72 mounted
on an end part on the upper plate storage part 41 side of
the upper nozzle 7 can be fixed to the mounting part 46.
Due to this, the upper nozzle 7 can be fixed to the bottom
surface of the upper plate storage part 41.
[0020] The openable metal frame 5 is disposed to be able
to rotate with respect to the fixed metal frame 4 about a
rotation axis, and to be openable.
In the present specification, a state in which the
sliding nozzle device 3 is closed indicates a state in
which the openable metal frame 5 is closed and the upper
plate storage part 41 and the lower plate storage part 61
cannot be seen from the outside. A state in which the
sliding nozzle device 3 is opened indicates a state in
which the openable metal frame 5 is opened and the upper
plate storage part 41 and the lower plate storage part 61
can be seen from the outside.
[0021] When the slide metal frame 6 slides with respect
to the fixed metal frame 4, the lower plate 62 can also
slide in a state of being in contact with the upper plate
42. Thus, by sliding the slide metal frame 6 to adjust a
positional relation with the fixed metal frame 4, an
overlapping of the plate hole 621 of the lower plate 62 and
the plate hole 421 of the upper plate 42 can be adjusted.

By adjusting the overlapping thereof, a flow rate of the
molten metal that flows out can be adjusted.
[0022] Next, the following describes the jig for
mounting an upper nozzle (hereinafter, simply referred to
as a "jig") according to the embodiment of the present
invention.
[0023] As illustrated in FIG. 4 and FIG. 5, a jig 1
includes a base plate 11, an outer wall 12, grips 13, and a
mortar receiver 14.
The base plate 11 has a shape of covering the bottom
surface of the upper plate storage part 41 in a state in
which the jig 1 is installed in the upper plate storage
part 41.
The base plate 11 includes an opening 111 and a
mounting hole 112. The opening 111 has a substantially
circular shape. In a state in which the base plate 11
covers the bottom surface of the upper plate storage part
41, the through hole 43 of the upper plate storage part 41
communicates with the opening 111 of the base plate 11.
The mounting hole 112 is a hole obtained by cutting out the
base plate 11 at an edge portion of the opening 111 in a
semicircular shape. When the jig 1 is installed in the
upper plate storage part 41, the mounting hole 112
communicates with the mounting part 46. Thus, the base
plate 11 of the jig 1 does not hinder the upper nozzle 7
from being fixed to the upper plate storage part 41.
[0024] In the present specification, a back surface of
the jig 1 is assumed to be a surface of the base plate 11
that is brought into contact with the upper plate storage
part 41 when the jig 1 is installed in the upper plate
storage part 41, and a front surface thereof is assumed to
be a surface opposite thereto. In the present
specification, a front surface side is a direction in which

the front surface of the base plate 11 is oriented, and a
back surface side is a direction in which the back surface
of the base plate 11 is oriented.
[0025] Projecting parts 113 are formed on the back
surface of the base plate 11. Two projecting parts 113 are
formed on the back surface of the base plate 11.
[0026] The outer wall 12 is formed along an outer
circumference of the base plate 11. The outer wall 12 is a
surface erected toward the front surface side of the base
plate 11. The outer wall 12 protects a side surface of the
upper plate storage part 41 so that refractory mortar does
not adhere to the side surface at the time when the upper
nozzle 7 is mounted.
[0027] In the present specification, a surface of the
outer wall 12 facing the base plate 11 is assumed to be an
inner peripheral surface, and a surface of the outer wall
12 facing the outside is assumed to be an outer peripheral
surface.
[0028] In the present embodiment, in a state in which
the jig 1 is mounted on the upper plate storage part 41,
there is a gap between the outer peripheral surface of the
outer wall 12 and the side surface of the upper plate
storage part 41, so that the upper plate storage part 41
hardly interferes with the jig 1. Thus, the jig 1 can be
easily mounted on the upper plate storage part 41.
[0029] The grips 13 projecting toward the front surface
side of the base plate 11 are disposed on the front surface
of the base plate 11 and the outer peripheral surface of
the outer wall 12. The grips 13 each have a U-shape, and
are used for carrying the jig 1 from the front surface side
of the base plate 11.
[0030] The mortar receiver 14 is disposed on a lower
side of the front surface of the base plate 11. As

illustrated in FIG. 6, the mortar receiver 14 includes a
lower wall 141, and a pair of side walls 142 and 142. The
pair of side walls 142 and 142, and the lower wall 141 of
the mortar receiver 14 are disposed on the inner peripheral
surface side of the outer wall 12.
As illustrated in FIG. 7, the lower wall 141 and the
pair of side walls 142 and 142 of the mortar receiver 14
are disposed to project from the outer wall 12. The pair
of side walls 142 and 142 are inclined and extend upward
from both end parts of the lower wall 141. In other words,
the pair of side walls 142 and 142 of the mortar receiver
14 extend from the lower wall 141 toward a direction in
which the opening 111 of the base plate 11 is present. A
part of the mortar receiver 14 on the opening 111 side of
the base plate 11 is opened. Due to this, refractory
mortar that overflows at the time of mounting the upper
nozzle 7 can be received by the lower wall 141 and the pair
of side walls 142 and 142.
[0031] The projecting parts 113 on the back surface of
the base plate 11 are engaged with the recessed parts 45
formed on the upper plate storage part 41. When the
projecting parts 113 are engaged with the recessed parts
45, the position of the jig 1 with respect to the fixed
metal frame 4 can be determined. That is, the projecting
parts 113 function as engaging parts, and the recessed
parts 45 function as parts to be engaged.
[0032] A diameter of the opening 111 of the base plate
11 is larger than a diameter of the through hole 43 of the
upper plate storage part 41. Thus, the upper nozzle 7 does
not interfere with the base plate 11 at the time when the
upper nozzle 7 is inserted.
A difference between the diameter of the opening 111
of the base plate 11 and the diameter of the through hole

43 of the upper plate storage part 41 (hereinafter,
referred to as a "diameter difference") is preferably equal
to or smaller than 30 mm.
In a case in which there is no diameter difference, an
amount of the refractory mortar remaining around the
through hole 43 becomes too small, so that friction between
the upper plate 42 and the upper plate storage part 41 is
increased. Thus, the upper plate is worn out more rapidly
as compared with a case in which the upper nozzle 7 is
mounted by using the jig 1 in which the diameter of the
opening 111 is larger than the diameter of the through hole
43.
In a case in which the diameter difference is larger
than 30 mm, the amount of the refractory mortar remaining
around the through hole 43 becomes too large, so that a
level difference is generated between the upper plate 42
and the upper plate storage part 41. Thus, a load tends to
be applied to the upper plate 42 as compared with a case in
which the upper nozzle 7 is mounted by using the jig 1
having the diameter difference equal to or smaller than 30
mm.
[0033] The base plate 11 is made of a ferromagnetic
material, so that the base plate 11 can be attracted to the
fixed metal frame 4 by magnetic force of the magnet 44
disposed on the upper plate storage part 41. In this way,
it is possible to prevent a gap from being generated
between the base plate 11 and the upper plate storage part
41.
In this case, the ferromagnetic material indicates a
material attracted to a magnet such as iron, cobalt, and
nickel.
[0034] Next, the following describes a method of using
the jig 1.

In a case of mounting the upper nozzle 7 on the molten
metal container 2 and the sliding nozzle device 3, the
upper nozzle 7 is inserted into the upper nozzle insertion
port 21 of the molten metal container 2 via the through
hole 43 of the upper plate storage part 41 of the fixed
metal frame 4 in the sliding nozzle device 3 disposed on
the bottom surface of the molten metal container 2.
As illustrated in FIG. 8, the jig 1 is used by being
mounted on the upper plate storage part 41 of the fixed
metal frame 4 at the time of mounting the upper nozzle 7 on
the molten metal container 2 and the sliding nozzle device
3.
[0035] The following specifically describes the method
of using the jig 1.
The upper nozzle 7 is mounted on the molten metal
container 2 and the sliding nozzle device 3 in a state in
which the sliding nozzle device 3 is opened.
First, in a state in which the sliding nozzle device 3
is opened, the jig 1 is mounted on the upper plate storage
part 41 as illustrated in FIG. 8. At this point, the
position of the jig 1 with respect to the upper plate
storage part 41 is determined by inserting the projecting
parts 113 of the base plate 11 into the recessed parts 45
of the upper plate storage part 41. At this point, the
through hole 43 of the upper plate storage part 41
communicates with the opening 111 of the base plate 11.
Next, as illustrated in FIG. 9, refractory mortar M is
applied to the upper nozzle 7, and the upper nozzle 7 is
inserted into the upper nozzle insertion port 21 of the
molten metal container 2 via the through hole 43 of the
upper plate storage part 41. At this point, as illustrated
in FIG. 10, the refractory mortar M overflowed from the
periphery of the upper nozzle insertion port 21 of the

molten metal container 2 adheres to the base plate 11. The
refractory mortar M that has not adhered to the base plate
11 drops down by self weight, and is collected by the
mortar receiver 14 disposed on the lower side of the base
plate 11.
Next, the fixture 72 mounted on the upper nozzle 7 is
fixed to the nozzle mounting part 46 of the upper plate
storage part 41.
Finally, the jig 1 is dismounted from the upper plate
storage part 41.
The opening 111 of the base plate 11 is larger than
the through hole 43 of the upper plate storage part 41, so
that a small amount of the refractory mortar M remains
around the through hole 43 of the upper plate storage part
41 as illustrated in FIG. 11 after the jig 1 is dismounted.
[0036] In this way, when the upper nozzle 7 is mounted
on the molten metal container 2 and the sliding nozzle
device 3 by using the jig 1, the refractory mortar M that
has overflowed at the time of mounting the upper nozzle 7
adheres to the jig 1, so that adhesion of the refractory
mortar M to the upper plate storage part 41 can be
suppressed. Thus, an amount of the refractory mortar M
that remains in the upper plate storage part 41 can be
reduced. The overflowed refractory mortar M can be
collected by the mortar receiver 14, so that the sliding
nozzle device 3 and a footing are not contaminated by the
refractory mortar M.
The amount of the refractory mortar M that adheres to
the sliding nozzle device 3 can be reduced, so that the
refractory mortar M between the upper nozzle 7 and the
upper plate 42 is reduced, and a load is hardly applied to
the upper plate 42. Thus, the upper plate 42 can be
prevented from being worn out.

[0037] In the present embodiment, the sliding nozzle
device 3 includes the fixed metal frame 4, the openable
metal frame 5 disposed on the fixed metal frame 4, and the
slide metal frame 6 disposed on the openable metal frame 5,
but the present invention is not limited to this structure,
and can be applied to various kinds of sliding nozzle
devices 3. For example, the slide metal frame 6 may be
disposed on the fixed metal frame 4.
[0038] Especially at the time of mounting the upper
nozzle 7, the refractory mortar tends to remain around the
through hole 43. Thus, although the base plate 11 has a
shape of covering the bottom surface of the upper plate
storage part 41 in a state in which the jig 1 is installed
in the upper plate storage part 41 in the present
embodiment, the base plate 11 does not necessarily cover
the entire surface of the upper plate storage part 41. The
base plate 11 may have a shape of covering at least the
periphery of the through hole 43 of the bottom surface of
the upper plate storage part 41. Due to this, the amount
of the refractory mortar that remains in the upper plate
storage part 41 can be reduced.
[0039] The grips 13 are disposed on the base plate 11
and the outer wall 12 in the present embodiment.
Alternatively, for example, two grips 13 may be disposed on
the base plate 11, or the grips 13 may be disposed on
either one of the base plate 11 and the outer wall 12.
[0040] In the present embodiment, the engaging part
(projecting part) is disposed on the back surface of the
base plate 11, and the part to be engaged (recessed part)
is disposed on the bottom surface of the upper plate
storage part 41. Alternatively, the structure may be such
that the part to be engaged (recessed part) is disposed on
the back surface of the base plate 11, and the engaging

part (projecting part) is disposed on the bottom surface of
the upper plate storage part 41.
The structure for determining the position of the jig
I with respect to the upper plate storage part 41 is not
limited to the recessed part and the projecting part. For
example, the position may be determined by hanging part of
the jig 1 on the through hole 43 or the mounting hole 112.
Alternatively, the position of the jig 1 with respect to
the upper plate storage part 41 may be determined by
bringing the outer wall 12 to abut on the side surface of
the upper plate storage part 41. In this case, the
engaging part and the part to be engaged are not
necessarily formed on the bottom surfaces of the base plate
II and the upper plate storage part 41.
[0041] In the present embodiment, the magnets 44 are
disposed on the bottom surface of the upper plate storage
part 41, but the number thereof may be optional. It is
sufficient that at least one magnet 44 is disposed on each
of an upper side and a lower side of the through hole 43 of
the upper plate storage part 41.
In the present embodiment, the base plate 11 is made
of the ferromagnetic material corresponding to the magnet
44, but the ferromagnetic material corresponding to the
magnet 44 may be disposed on the base plate 11.
Alternatively, the magnet may be disposed on the base
plate 11 of the jig 1, and the ferromagnetic material
corresponding to the magnet may be disposed on the bottom
surface of the upper plate storage part 41. The magnet may
be disposed on the base plate 11 of the jig 1, and the
upper plate storage part 41 may be made of the
ferromagnetic material corresponding to the magnet. In
this case, the magnet is positioned on the back surface of
the base plate 11, and it is sufficient that at least one

magnet is disposed on each of an upper side and a lower
side of the opening 111.
[0042] In the present embodiment, the opening 111 of the
base plate 11 of the jig 1 has a circular shape, but may
have any shape so long as the upper nozzle 7 does not
interfere with the base plate 11 at the time of inserting
the upper nozzle 7. The shape of the opening 111 may be a
quadrangular shape or an elliptical shape, for example.
Reference Signs List
[0043] 1 JIG (JIG FOR MOUNTING UPPER NOZZLE)
11 BASE PLATE
111 OPENING
112 MOUNTING HOLE
113 PROJECTING PART (ENGAGING PART)

12 OUTER WALL
13 GRIP
14 MORTAR RECEIVER
141 LOWER WALL
142, 142 SIDE WALL

2 MOLTEN METAL CONTAINER
3 SLIDING NOZZLE DEVICE
4 FIXED METAL FRAME

41 UPPER PLATE STORAGE PART
42 UPPER PLATE
43 THROUGH HOLE
44 MAGNET
45 RECESSED PART (PART TO BE ENGAGED)
46 MOUNTING PART
47 LOCK MECHANISM

5 OPENABLE METAL FRAME
6 SLIDE METAL FRAME
61 LOWER PLATE STORAGE PART

62 LOWER PLATE
7 UPPER NOZZLE
71 NOZZLE HOLE
72 FIXTURE
8 LOWER NOZZLE
81 NOZZLE HOLE
M REFRACTORY MORTAR

We Claim :
1. A jig for mounting an upper nozzle, the jig being
detachable from an upper plate storage part of a sliding
nozzle device, the sliding nozzle device being mounted on a
bottom surface of a molten metal container having an upper
nozzle insertion port at a bottom part, and including the
upper plate storage part and a through hole disposed on the
upper plate storage part to communicate with the upper
nozzle insertion port, the jig comprising:
a base plate that is able to cover at least a
periphery of the through hole on a bottom surface of the
upper plate storage part, wherein
an opening is disposed on the base plate, and the
opening has a diameter larger than a diameter of the
through hole.
2. The jig for mounting an upper nozzle as claimed in
claim 1, wherein an outer wall is disposed on an outer
circumference of the base plate.
3. The jig for mounting an upper nozzle as claimed in
claim 1 or 2, wherein a difference between the diameter of
the opening and the diameter of the through hole is equal
to or smaller than 30 mm.
4. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 3, wherein the base plate comprises an
engaging part, and the bottom surface of the upper plate
storage part comprises a part to be engaged with which the
engaging part is engaged.
5. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 3, wherein the bottom surface of the

upper plate storage part comprises an engaging part, and
the base plate comprises a part to be engaged with which
the engaging part is engaged.
6. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 5, wherein a magnet is disposed on the
base plate, and a ferromagnetic material corresponding to
the magnet is disposed on the upper plate storage part.
7. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 5, wherein a magnet is disposed on the
bottom surface of the upper plate storage part, and a
ferromagnetic material corresponding to the magnet is
disposed on the base plate.
8. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 5, wherein a magnet is disposed on the
base plate, and the upper plate storage part is made of a
ferromagnetic material corresponding to the magnet.
9. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 5, wherein a magnet is disposed on the
upper plate storage part, and the base plate is made of a
ferromagnetic material corresponding to the magnet.
10. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 9, further comprising a grip.
11. The jig for mounting an upper nozzle as claimed in any
one of claims 1 to 10, wherein a mortar receiver is
disposed on the base plate, and the mortar receiver is
opened on a side of the opening of the base plate.

12. A method of mounting an upper nozzle for a sliding
device that is mounted on a bottom surface of a molten
metal container having an upper nozzle insertion port at a
bottom part, and comprises an upper plate storage part and
a through hole disposed on the upper plate storage part to
communicate with the upper nozzle insertion port, the
method comprising:
a first step of mounting a jig on the upper plate
storage part, the jig comprising a base plate that covers
at least a periphery of the through hole on a bottom
surface of the upper plate storage part, and having an
opening disposed on the base plate and having a diameter
larger than a diameter of the through hole; and
a second step of inserting an upper nozzle to which
refractory mortar is applied into the upper nozzle
insertion port via the through hole.
13. The method of mounting an upper nozzle as claimed in
claim 12, wherein
an engaging part is disposed on one of the bottom
surface of the upper plate storage part and the base plate,
and a part to be engaged with which the engaging part is
engaged is disposed on the other one of the bottom surface
and the base plate, the method further comprising:
a third step of engaging the engaging part with the
part to be engaged to position the jig with respect to the
upper plate storage part between the first step and the
second step.