JPH10230355A - Immersion nozzle exchanging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the exchanging yard for exchanging immersion nozzles as much as possible, to simultaneously exchange plural immersion nozzles and moreover to heat immersion nozzles to be exchanged with a pre-heating furnace until just before the exchanging time. SOLUTION: In the immersion nozzle exchanging device exchanging immersion nozzles 3 of a molten metal housing ladle 1, the mobile carriage 7 self- running on a pair of rails 6 laid in the lower side of the molten metal housing ladle 1 and nozzle exchanging devices 8a...8n placed on the mobile carriage 7 are provided, the mobile carriage 7 is stopped in the lower side of the molten metal housing pan 1, and immersion nozzles 3 of the molten metal housing ladle 1 positioning in the upper side of nozzle exchanging devices 8a...8n are exchanged with new immersion nozzles 3 by nozzle exchanging devices 8a...8n.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion nozzle exchanging apparatus used when exchanging an immersion nozzle attached to a molten metal storage pot such as a tundish or a ladle in a continuous casting apparatus.

[0002]

2. Description of the Related Art An immersion nozzle exchanging apparatus described in Japanese Patent Application Laid-Open No. 4-28475 is an immersion nozzle exchanging apparatus for exchanging an immersion nozzle attached to a molten metal storage pan such as a tundish or a ladle in a continuous casting apparatus. Has been proposed. This device will be described with reference to FIGS. FIG. 6 is an overall plan view of this device, and FIG.
7 is a sectional view taken along the line II of FIG. 6, and FIG. 8 is an enlarged view of a main part of FIG.

[0003] As shown in FIG.
Reference numeral 0 denotes a rail 104 laid so as to pass near an immersion nozzle 103 detachably attached to an outflow nozzle 102 of a tundish 101, and travels between a retreat position A and a forward limit C on the rail 104. Self-propelled trolley 105
A movable arm 106 provided on the self-propelled carriage 105 at right angles to the traveling direction, a support mechanism 107 for the immersion nozzle 103 provided at the tip of the movable arm 106, and a cleaning device 108 for the lower surface of the outflow nozzle 102 And

A description will now be given of the replacement operation of the conventional replacement device for the immersion nozzle configured as described above. First, the self-propelled carriage 105 is disposed at the retreat position A in FIG. 6, and at this position, the used immersion nozzle 103 removed from the tundish 101 is taken out from the support mechanism 107. The self-propelled carriage 105 is then moved to the standby position B, where a new immersion nozzle 1 attached to the tundish 101 is placed.
03 is mounted on one end side of the support mechanism 107 and stands by. Subsequently, the tundish 1 is raised to a height at which the used immersion nozzle 103 does not hit the upper surface of the cover of the mold 111, and the immersion nozzle mounting device 110 is operated, whereby the used immersion installed in the molten metal storage pan 1 is started. The nozzle 103 is moved from the set state to the downward release state.

[0005] Then, the immersion nozzle changing device 100 is moved to the vicinity of the immersion nozzle mounting device of the mold 111, and an operator sets a packing (not shown) on the upper portion of the immersion nozzle 103 to be used. Next, as shown in FIG. 8, a support mechanism 107 attached to the distal end of the movable arm 106.
The other end of the holder 103a holds the immersion nozzle 3.
The movable arm 106 is moved so as to engage with the pin 109 of FIG. The immersion nozzle 3 held by the movable arm 106 via the pin 109 is lifted upward by the movable arm 106, and becomes free from the immersion nozzle mounting device 110. By retracting the movable arm 106 from below the outflow nozzle 102, the immersion nozzle 1
03 is removed.

Thereafter, a cleaning device 108 made of a rotating wire brush or a grindstone (not shown) is positioned below the outflow nozzle 102, and the rotating wire brush or the grindstone is rotated while being pressed against the lower end surface of the outflow nozzle 102, so that the outflow nozzle 102 is rotated. The lower end of 102 is cleaned. After the cleaning is completed, the new immersion nozzle 103 held at one end of the support mechanism 107 is moved to the nozzle center position of the outflow nozzle 2 and set on the immersion nozzle mounting device 110 so that the new immersion nozzle 103 is set. Is performed, and the immersion nozzle mounting device 110 is operated to activate the immersion nozzle 1
03 is fixed. After that, the used immersion nozzle 103
The self-propelled carriage 105 holding the immersion nozzle 103 is returned to the evacuation position A, and the used immersion nozzle 103 removed from the tundish 101 is taken out. Subsequently, the self-propelled carriage 105 waits at the position B, and the above-described operation is repeated.

[0007]

By the way, in the immersion nozzle exchanging device described above, a rail is laid on the side of the molten metal storage pan, and the self-propelled carriage on which the immersion nozzle exchanging device is mounted is not provided. It is configured to run on the rail. Therefore, in order to replace the immersion nozzle, a space for the molten metal storage pot and a space for the self-propelled carriage to travel are required, and the immersion nozzle is replaced using a conventional immersion nozzle replacement device. Needed a fairly large working space. Especially, since the rail is laid on the side of the molten metal storage pot, when the width of the nozzle replacement yard (work area for nozzle replacement) is narrow, the immersion nozzle using the conventional immersion nozzle replacement device is used. There was a technical problem that replacement work could not be performed.

Further, when replacing the immersion nozzle, the new immersion nozzle to be replaced needs to be heated in a preheating furnace in advance in order to improve the working efficiency. That is, when the immersion nozzle is to be heated after the immersion nozzle is attached to the molten metal storage pan, the molten metal storage pan cannot be used during the heating, and the production efficiency is reduced. is there.

In the above-described immersion nozzle changing device, the self-propelled carriage is moved to the standby position B, where a new immersion nozzle mounted on the molten metal storage pan is mounted and stands by. ing. Therefore, in this conventional immersion nozzle replacement device, the heated immersion nozzle is cooled during standby, and particularly when the standby time is long, after the immersion nozzle is attached to the molten metal storage pan, Has to be reheated.

Further, in the above-described conventional immersion nozzle exchanging device, when exchanging one immersion nozzle, the immersion nozzle exchanging device moves the immersion nozzle via the retreat position, the standby position, and the forward limit position. This operation has to be repeated by the number of immersion nozzles to be replaced, since it is configured to be replaced and returned to the retracted position again. Therefore, it took a considerable time to replace the immersion nozzle, and it was not possible to improve the work efficiency. In particular, today's molten metal storage pans are equipped with several immersion nozzles, and there is a technical problem that the replacement operation takes a considerable time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and it is possible to minimize the number of replacement yards for replacing immersion nozzles and to simultaneously replace a plurality of immersion nozzles. It is another object of the present invention to provide an immersion nozzle exchanging apparatus capable of heating an immersion nozzle to be exchanged by a preheating furnace until immediately before the exchange.

[0012]

An immersion nozzle exchanging device according to the present invention is a immersion nozzle exchanging device for exchanging an immersion nozzle of a molten metal storage pan, wherein a pair of lasers laid below the molten metal storage pan are provided. And a self-propelled truck that runs on
A nozzle exchange device mounted on the self-propelled vehicle, the self-propelled vehicle stops below the molten metal storage pan, and the immersion nozzle of the molten metal storage pan located above the nozzle exchange device, It is characterized in that a new immersion nozzle is replaced by a nozzle replacing device.

Here, the molten metal storage pan is formed of a casting yarn.
The self-propelled vehicle mounted on the self-propelled vehicle movable between the nozzle and the nozzle replacement yard and having the nozzle replacement device mounted thereon is between the pair of rails of the self-propelled vehicle of the molten metal storage pan. In addition, it is desirable to be configured to run on a pair of rails laid at a position lower than the rail.

Further, a plurality of nozzle changing devices are mounted on the self-propelled carriage on which the nozzle changing device is mounted, and a plurality of immersion nozzles mounted on the lower surface of the molten metal storage pot are simultaneously replaced. It is desirable to be constituted.

Further, the nozzle changing device mounted on the self-propelled carriage has at least a hand for attaching and detaching the immersion nozzle, a nozzle accommodating section for accommodating the removed immersion nozzle, and an immersion nozzle for replacement. It is desirable to have a preheating furnace for preheating.

In addition, the nozzle replacement device is mounted on a self-propelled carriage of the nozzle replacement device via a first base and a second base, and the first base and the second base are mounted. Therefore, it is desirable that the nozzle replacement device is configured to be movable back and forth with respect to the self-propelled carriage.

Since the immersion nozzle replacement device according to the present invention has the above-described configuration, it is configured to enter a lower portion of the molten metal storage pot and perform a predetermined operation. Even when the width is narrow, the immersion nozzle replacement operation can be performed using the immersion nozzle replacement device. As a result, the immersion nozzle can be replaced safely and efficiently for the operator. Especially,
Since the self-propelled vehicle is equipped with a plurality of immersion nozzle replacement devices, the plurality of immersion nozzles can be replaced at the same time, and work efficiency can be improved. In addition, since the immersion nozzle replacement device is equipped with a preheating furnace, the immersion nozzle can be preheated until immediately before the immersion nozzle is mounted, and after the nozzle replacement, the molten metal pot can be used immediately in the casting process. In addition, the manufacturing efficiency can be improved.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a schematic front view showing the front of the molten metal storage pan and the immersion nozzle changing device according to the present invention, and FIG. 2 is a side view showing the side of FIG. Furthermore,
3 to 5 show a replacement unit of the immersion nozzle replacement device according to the present invention. FIG. 3 is a plan view, FIG. 4 is a side view, and FIG.
Is a front view.

Referring to FIGS. 1 and 2, a schematic configuration of an immersion nozzle replacement device according to the present invention will be described. As shown in the drawing, reference numeral 1 denotes a molten metal storage pot such as a tundish or a ladle in a continuous casting apparatus. Nozzle 3 is attached. The molten metal storage pan 1 is mounted on a molten metal storage pan self-propelled carriage 4 by supporting means (not shown). Note that FIG. 1 shows only a part of the right side of the molten metal storage pot self-propelled carriage 4. Wheels 4a are provided on the lower surface of the molten metal storage pot self-propelled trolley 4, and a casting yarn of the self-propelled trolley 4 is provided.
It is configured to be able to run on a pair of rails 5 provided between the nozzle and the nozzle replacement yard. That is, the molten metal storage pan 1
Is a casting yarn by the molten metal storage pot self-propelled carriage 4.
From the nozzle replacement yard to the casting yard.

Further, the self-propelled vehicle travels on a pair of rails 6 provided between the pair of rails 5 of the molten metal storage pot self-propelled carriage 4 and at a position lower than the rails 5. An exchanging device self-propelled vehicle 7 is provided, on which a plurality of nozzle exchanging devices 8a... 8n are mounted. As shown in FIG. 2, wheels 7a of the self-propelled trolley 7 are provided on both sides of the trolley 7 so as to keep the height low. At the left end (front end) of the exchange device self-propelled carriage 7, a disposal pot 9 for disposing of the residue in the molten metal storage pan is provided.

A signal cable 10 for controlling the operation of each nozzle changing device 8 and the like is derived from the right end of the self-propelled carriage 7 of the changing device, and receives a control signal from the signal cable 10 to receive a control signal. The nozzle replacement device 8 is configured to perform a predetermined operation. In the figure, reference numeral 11 denotes a maintenance deck of the signal cable 10, and reference numeral 12 denotes an operator.

As described above, the immersion nozzle replacement device according to the present invention is configured such that the nozzle replacement device 8 enters below the molten metal storage pot 1 and performs a predetermined replacement operation. The width of the conventional nozzle replacement yard, such as the case where a rail is laid on the side of the pot, is not required, and even if the width of the nozzle replacement yard is small,
Using the immersion nozzle replacement device, the immersion nozzle replacement operation can be performed.

Next, one nozzle changing device 8 mounted on the self-propelled trolley 7 will be described with reference to FIGS. This nozzle exchange device 8 is used for the molten metal storage pan 1
A detaching hand 21 for detaching the immersion nozzle 3 attached to the lower surface of the nozzle, a nozzle storage section 22 for accommodating the removed immersion nozzle, a preheating furnace 23 for preheating a new immersion nozzle, and a molten metal for preheating the immersion nozzle. A mounting hand 24 for mounting on the lower surface of the storage pan, a packing mounting device 25 for mounting packing made of mortar on an upper portion of the immersion nozzle when mounting the preheated immersion nozzle on the lower surface of the molten metal storage pan, After removing the dowel surface, a dowel surface cutting device 26 for cutting the residue of the molten metal adhered to the dowel surface, and a positioning pin 27 for positioning the base 20 with respect to the molten metal storage pan 1
Is provided.

The nozzle exchanging device 8 includes a first base 28 movable in the front-rear direction with respect to the traveling direction of the exchanging device self-propelled carriage 7, and a direction perpendicular to the first base 28. (A left-right direction) and a second base 29 movable in the left-right direction, and a ball bearing 30 is interposed between the second base 29 and the base 20. Each of the above-described devices for nozzle replacement, such as the removal hand 21, the storage unit 22, and the preheating furnace 23, is mounted on the base 20.

Here, the first base 28 and the second base 2
9. The relationship between the base 20 and the first base 2
Reference numeral 8 denotes a rail attached to the self-propelled carriage 7 by a piston cylinder (not shown) fixed to the exchange device self-propelled carriage 7.
The second base 29 can be moved back and forth on the first base 28 by means of a piston cylinder 31 fixed on the first base 28. It is configured to be able to move on the left and right direction on the ruler 28a.

Further, the base 30 is constructed so as to be able to move by a predetermined amount in all directions on a horizontal plane by means of a ball bearing 30 mounted between the second base 29 and the base 20. Although not shown, a fixing means for preventing the base 20 from moving with respect to the second base 29 by the ball bearing 30 and fixing the both integrally is provided.

As described above, each base 28, the second base 29,
Since the base 20 is configured, when the position of the base 20 is deviated from the normal position, the positioning pins 27 mounted on the base 20 are provided on the lower surface of the molten metal storage pan 1 described later. When the base 20 is engaged with the positioned positioning block 35, the base 20 moves to a proper position. Then, in the state of the proper position, the base 20 is fixed to the second base 29 by fixing means. As a result, each device on the base 20 is placed at a proper position and is fixed to the second base 29. And the piston cylinder 3
The first base 28, the second base 28,
Is moved in the front-rear and left-right directions with respect to the exchange device self-propelled device 7.

Also, a detachment hand 2 for detaching the immersion nozzle 3 attached to the lower surface of the molten metal storage pan 1
1, and the attachment hand 24 for attaching the immersion nozzle to the lower surface of the molten metal storage pan will be described in detail.
As shown in FIG. 3, the hand 21 and the hand 24 have a bifurcated tip, and are configured to engage with an engaging pin 103a formed on the immersion nozzle holder 103 shown in FIG. Have been.

A piston cylinder 32 for raising and lowering the hand 21 is attached to the back side of the detaching hand 21 so that the hand 21 can be moved up and down. Similarly, an attachment hand 24 for attaching the preheated immersion nozzle to the lower surface of the molten metal storage pan is also formed with a piston cylinder 33 attached so that the hand 24 can be moved in the vertical direction.
In this embodiment, the detaching hand 21 and the attaching hand 24 have been described as separate bodies. However, the detaching and attaching operation may be performed by one hand.

The preheating furnace 23 for preheating the new immersion nozzle is provided with a preheating burner 34.
Is introduced into the preheating furnace 23 to heat the immersion nozzle 3. In addition, as shown in FIG. 2, an exhaust duct 37 is provided above the preheating furnace 23, and is configured to exhaust the exhaust gas from the preheating furnace 23 to the outside. This exhaust duct 37 is shown only in FIG. 2 and is omitted in other drawings.

The packing mounting device 25 for mounting the mortar packing on the upper part of the immersion nozzle 3, which is used when mounting the preheated immersion nozzle 3 on the lower surface of the molten metal storage pan 1, comprises a suction head 25a. And a drive source for rotating the suction head 25a in the vertical direction,
The packing placed on a packing table (not shown) is sucked by the suction head 25a, the suction head 25a is moved by the driving source, and the packing is mounted on the upper part of the immersion nozzle 3.

Further, the dowel surface cutting device 26 is a device for removing the residue adhering to the dowel surface with which the upper end surface of the immersion nozzle 3 contacts after removing the immersion nozzle 3.
It comprises a cutter 26a, a drive source 26b for rotating the cutter 26a, and a piston cylinder 26c for raising and lowering the cutter 26a.

The positioning pin 27 for positioning the base 20 with respect to the molten metal storage pan 1 is provided with a piston cylinder 35 for moving the pin 27 up and down. The positioning pin 27 is raised to engage with a positioning block 36 provided on the lower surface of the molten metal storage pan 1 shown in FIG. 2 so that positioning is performed.

Next, the operation of the immersion nozzle replacement device according to the present invention will be described. First, as a preparation step, the immersion nozzle 3 is loaded into the preheating furnace 23 of each of the nozzle replacing devices 8a to 8n and heated, and the preheating state of the immersion nozzle 3 is maintained. Then, when a molten metal storage pan 1 requiring replacement of the immersion nozzle 3 is generated, the molten metal storage pot self-propelled carriage 4 is moved from the casting yard to the nozzle replacement yard. On the other hand, the exchange device self-propelled trolley 7 is moved below the molten metal storage pan self-propelled trolley 4, the waste pot 9 is stopped immediately below each immersion nozzle 3, and the residue remaining in the molten metal storage pan is discarded. Discard at 9. When the disposal of the residue is completed for all the immersion nozzles 3, the exchange device self-propelled carriage 7
Is stopped at a predetermined position. At this time, the nozzle exchange devices 8a to 8n are located substantially directly below the respective immersion nozzles 3 attached to the molten metal storage pan 1.

Next, the positioning pins 27 of the nozzle changing devices 8a to 8n are raised by the piston cylinder 35, and the pins 27 are engaged with the positioning blocks 36 provided on the lower surface of the molten metal storage pan 1. At this time, the base 2
When the position 0 is displaced with respect to the molten metal storage pan 1, the base 20 is in a free state by the ball bearing 30. The platform 20 moves in a direction to correct the displacement.

Thereafter, the base 20 is fixed to the second base 29 by using a locking means (not shown). With this position as the origin position, each cylinder is operated in response to a control signal from the signal cable 10 and the first and second bases are moved, whereby the preheating furnace 23 and the dowel surface cutting cutter 2 are moved.
Each device such as 6 is located directly below the immersion nozzle mounting device 2. It should be noted that the displacement of the base 20 is corrected,
0 is fixed to the second base 29, the positioning pins 27
And the block 36 are disengaged.

At this origin position, the detaching hand 21 and the nozzle housing 22 are located directly below the immersion nozzle mounting device 2. From this state, the removal hand 21 is raised by the piston cylinder 32, the immersion nozzle mounting device 2 is released, and the pin provided on the holder of the immersion nozzle 3 is engaged with the hand 21 to remove the removal hand 21. Receive. After receiving the immersion nozzle 3, the piston cylinder 32 is contracted and the hand 21 is lowered, and the immersion nozzle 3 is stored in the storage section 22.

After removing the immersion nozzle 3, the residue of the molten metal adhered to the dowel surface is removed. First,
The second base 29 is moved with respect to the first base 28, and the dowel surface cutting device 26 is positioned immediately below the mounting position of the immersion nozzle 3. Thereafter, the cutter 26a is raised by the piston cylinder 26c while being rotated by the drive source 26b, and the residue of the molten metal attached to the dowel surface is removed. When the removal of the residue is completed, the piston cylinder 36c is contracted, the cutter 26a is returned to the initial state, and the cutting of the dowel surface is completed.

Then, the first base 28 and the second base 29 are moved with respect to the self-propelled carriage 7 of the exchange device, and the mounting hand 24 and the preheating furnace 23 are placed immediately below the mounting position of the immersion nozzle 3. Position. At this time, since the exhaust duct 37 is fixed to the exchanging device self-propelled carriage 7, the exhaust duct 37 is removed from above the attaching hand 24 and the preheating furnace 23 by moving the mounting hand 24 and the preheating furnace 23. .

Thereafter, the packing mounting device 25 is operated to mount the packing on the preheated immersion nozzle 3. The immersion nozzle 3 on which the packing is mounted is lifted upward by a mounting hand 24, and the immersion nozzle 3 is mounted on the immersion nozzle mounting device 2. After the immersion nozzle 3 is attached to the immersion nozzle attachment device 2, the attachment hand 24 descends and returns to the initial state.

The above-described series of operations is performed by each of the nozzle changing devices 8.
.. 8n, and after a series of operations is completed, the molten metal storage pot self-propelled carriage 4 on which the molten metal storage pan 1 is placed moves from the nozzle replacement yard to the nozzle replacement yard. The nozzle changing devices 8... 8n in which the immersion nozzles 3 are stored in the nozzle housing 22 are moved to the standby yard by the self-propelled trolley 7, and discharge the immersion nozzles 3 housed in the nozzle housing 21. At the same time, a new immersion nozzle is loaded into the preheating furnace 23, and the immersion nozzle is brought into a heated state to stand by. Then, the molten metal storage pot self-propelled carriage 4 on which the molten metal storage pot 1 is placed again moves from the casting yard to the nozzle replacement yard, and the replacement operation of the immersion nozzle is started.
The above operation is repeated.

[0042]

The immersion nozzle replacement device according to the present invention is:
With the above configuration, since it is configured to be able to enter the lower part of the molten metal storage pot and perform a predetermined replacement operation, even when the width of the nozzle replacement yard is narrow, This has the effect that the immersion nozzle replacement operation using the immersion nozzle replacement device can be performed. As a result, the immersion nozzle can be replaced safely and efficiently for the operator. In addition, since a plurality of nozzle replacement devices are mounted on the replacement device self-propelled trolley, a plurality of immersion nozzles can be replaced at the same time, resulting in an effect that work efficiency can be improved. Furthermore, since the nozzle replacement device is provided with a preheating furnace, the immersion nozzle can be preheated immediately before mounting the immersion nozzle, and the molten metal storage pot can be used immediately in the casting process after the nozzle replacement. The effect is that it can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing the front of a molten metal storage pan and an immersion nozzle replacement device according to the present invention.

FIG. 2 is a side view showing a side surface of FIG. 1;

FIG. 3 is a plan view of a nozzle replacement device according to the present invention.

FIG. 4 is a view showing the front of a nozzle replacement device according to the present invention.

FIG. 5 is a view showing a side surface of the nozzle replacement device according to the present invention.

FIG. 6 is an overall plan view of a conventional immersion nozzle replacement device.

FIG. 7 is a sectional view taken along the line II of FIG. 6;

FIG. 8 is an enlarged view of a main part of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 molten metal storage pan 2 immersion nozzle mounting device 3 immersion nozzle 4 molten metal storage pot self-propelled trolley 5 rail 6 rail 7 nozzle exchange device self-propelled trolley 8 nozzle exchange device 9 waste pot 10 signal cable 11 maintenance Deck 12 Operator 20 Base 21 Removal Hand 22 Nozzle Storage Unit 23 Preheating Furnace 24 Mounting Hand 25 Packing Mounting Device 26 Dowel Surface Cutting Device 27 Positioning Pin 28 First Base 29 Second Base 30 Ball Bearing 31 Piston Cylinder 32 Piston cylinder 33 Piston cylinder 34 Preheating burner 35 Piston cylinder 36 Positioning block 37 Exhaust duct

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shin Kojima 1 Minami Fuji, Ogakie-cho, Kariya-shi, Aichi Prefecture Toshiba Ceramics Corporation Kariya Works (72) Inventor Hideki Igarashi 378, Oguni-machi, Oguni-machi, Oguni-machi, Nishiokitama-gun, Yamagata Prefecture Toshiba Ceramics Co., Ltd. Oguni Works (72) Inventor Satoshi Kawahito 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd.Wakayama Works (72) Inventor Shintake Nobutake 1850 Minato, Wakayama, Wakayama Sumitomo Metal Industrial Wakayama Works

Claims (5)

[Claims] 1. An immersion nozzle exchanging device for exchanging an immersion nozzle of a molten metal storage pan, wherein the self-propelled carriage self-propelled on a pair of rails laid below the molten metal storage pan; A nozzle exchange device mounted on a truck, wherein the self-propelled truck stops below the molten metal storage pan, and immerses the molten metal storage pan located above the nozzle exchange device with the nozzle exchange device. A replacement nozzle for a new nozzle. 2. The molten metal storage pan is mounted on a self-propelled vehicle movable between a casting yard and a nozzle replacement yard, and the self-propelled vehicle mounted with a nozzle replacement device is provided with the molten metal storage device. It is characterized in that it is configured to run on a pair of rails laid between the pair of rails of the self-propelled carriage of the storage pan and at a position lower than the rail. The immersion nozzle replacement device according to claim 1. 3. A self-propelled trolley on which the nozzle exchanging device is mounted, a plurality of nozzle exchanging devices are mounted, and a plurality of immersion nozzles attached to the lower surface of the molten metal storage pan are simultaneously exchanged. The immersion nozzle replacement device according to claim 1 or 2, wherein the device is configured. 4. A nozzle replacement device mounted on the self-propelled carriage includes at least a hand for mounting and dismounting the immersion nozzle, a nozzle storage unit for storing the removed immersion nozzle, and a immersion nozzle for replacement. 4. The immersion nozzle exchanging device according to claim 1, further comprising a preheating furnace for preheating. 5. The nozzle exchanging device is mounted on a self-propelled vehicle of the nozzle exchanging device via a first base and a second base, and is mounted by the first base and the second base. The immersion nozzle replacement device according to any one of claims 1 to 4, wherein the nozzle replacement device is configured to be movable back and forth and left and right with respect to the self-propelled carriage.