JP3140930B2 - Long nozzle preheating device for continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long nozzle preheating device mounted on the bottom of a ladle of a continuous casting machine.
The present invention relates to a long nozzle preheating device in which a long nozzle of a ladle at a casting position is always replaceable with a long nozzle in a preheated state.

[0002]

2. Description of the Related Art A ladle of a continuous casting facility is provided with a long pouring nozzle, called a long nozzle, which is detachably attached to the bottom of the ladle via a sliding nozzle, and molten steel in the ladle passes through a lower nozzle through the long nozzle. It is poured into a dish, and then cast into a mold via a sliding nozzle and a dipping nozzle at the bottom of the tundish. Slag and slag adhere to this type of nozzle during operation, and if left unchecked, the nozzle gradually narrows and the amount of pouring changes, so it is necessary to clean or replace the long nozzle when replacing the ladle .

Conventionally, a long nozzle has been replaced by installing a long nozzle attaching / detaching device provided with a swivel arm adjacent to a casting position on a casting floor, and manually or remotely automatically operating a long nozzle which is located on the swivel radius of the swivel arm. A new long nozzle has been delivered from the nozzle accommodating device to the tip of the arm, and has been replaced by turning to the position of the ladle at the casting position.

[0004] Further, there has been known an apparatus in which a long nozzle to be replaced is preheated before being mounted on a ladle and delivered to a long nozzle attaching / detaching apparatus (for example, Japanese Patent Laid-Open No. 2-1).
No. 33157, JP-A-2-133158, etc.). In this apparatus, one long nozzle is housed in a heating furnace main body whose side wall can be opened and closed in a double-opening manner, and the heating furnace main body is supported on a column of a carriage, and reciprocates between a swivel table and a long nozzle attaching / detaching device. The transfer of the long nozzle to each of the rotating table, heating furnace body and long nozzle attaching / detaching device is performed by another jib crane, and the heating of the long nozzle lowers the furnace lid and burner from above to the long nozzle. Then, the combustion gas is injected downward, and after the heating, the burner is detached upward again.

[0005]

When a long nozzle that has not been preheated at the casting position is replaced from a ladle, the long nozzle comes into contact with molten steel, and a rapid heat load is applied, which easily causes damage such as cracks. The unheated long nozzle increases the heat loss of molten steel during pouring.

On the other hand, in the apparatus described in the above publication in which a bogie type long nozzle heating furnace is provided between the long nozzle swivel table and the attachment / detachment device, the number of preheating long nozzles in the heating furnace is one. However, it is not possible to sufficiently cope with the trouble of the long nozzle during casting. Also, the used long nozzle removed from the ladle by the attachment / detachment device cannot be returned to the heating furnace as it is in the form of a preheated long nozzle, and must be once conveyed to a swivel table using a jib crane. There is a safety problem. Furthermore, since the heating method in this apparatus is a method in which combustion gas is fed into the nozzle from the top of the long nozzle accommodated in the heating furnace, it is necessary to lower the furnace lid and burner by aligning the furnace lid and the burner with the long nozzle. In addition, problems such as complicated control are pointed out.

[0007] The present invention is such that two or more long nozzles can always be preheated and stored at the casting position at the same time, and the preheated long nozzles can be directly replaced with the long nozzles of the ladle immediately after pouring by the long nozzle attaching / detaching device. To provide a long nozzle preheating device for a continuous casting facility.

According to the present invention, the preheating burner is fixed to the preheating furnace, and the long nozzle is lifted by a crane or the like and immediately transferred to the long nozzle attaching / detaching device in the preheated state without being lowered, and the long nozzle on the ladle side is provided. It is an object of the present invention to provide a long nozzle preheating device which can be replaced with the above, thereby improving the safety and speed of operation.

Another object of the present invention is to provide a long nozzle preheating apparatus in which a used long nozzle removed from a ladle after pouring is stored in the vicinity of a casting position, reheated as it is, and can be recycled. And

[0010]

According to the present invention, a long nozzle preheating device in a continuous casting facility according to the present invention is provided in proximity to a long nozzle attaching / detaching device installed so that a long nozzle of a ladle at a casting position can be replaced. In addition, a space between the inner / outer cylinder wall and the bottom wall is a storage chamber, and a plurality of long nozzles can be stored in an upright state in the storage chamber .
A preheating furnace having a long nozzle entrance on one side, a long nozzle support device rotatably supporting the long nozzle so as to sequentially feed the long nozzle in the preheating furnace to the long nozzle entrance of the preheating furnace, and the preheating. At least two in the furnace
As book a long nozzle can preheated simultaneously possess the combustion gas ejection portion provided in the lower part of該予thermal furnace, the long
The nozzle attaching / detaching device grasps the long nozzle and turns
And a swivel arm that can extend and retract
At least one of the long nozzle ports of the furnace is
It is arranged so as to face the turning center of the turning arm .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view showing a positional relationship between a ladle 1, a long nozzle preheating device 2, and a long nozzle attaching / detaching device 3 on a casting bed according to an embodiment of the present invention.
The ladle 1 is held by an arm (not shown) of a turning post, and is provided so as to turn above the casting floor 4.
Also, a tundish 5 held by a tundish turret (not shown) below the ladle 1 turns through a casting position A. In FIG. 1, reference numeral 6 denotes a turning path of the ladle 1, and reference numeral 7 denotes a turning path of the tundish 5. The long nozzle attaching / detaching device 3 is installed on the casting floor 4 outside the ladle turning path 6 near the ladle 1 at the casting position A. Long nozzle attaching / detaching device 3 as described later
Has a swing arm 9 that swings from a casting position A to a retracted position B around a column 8. The long nozzle preheating device 2 according to the present invention is provided on the casting floor at the retreat position B of the swing arm 9, and the long nozzle 10 is transferred between the tip of the swing arm 9 and the long nozzle preheating device 2. I have.

In the ladle 1 containing molten steel, the sand from the sliding nozzle (not shown) at the bottom of the ladle is discharged at the pan sand discharge / oxygen hole position C before the casting position A, and the long nozzle attaching / detaching device at the casting position A. A long nozzle 10 (preheated, which will be described later) held at the tip of the turning arm 9 of 3 is mounted below the sliding nozzle, and molten steel in the ladle 1 is poured into the tundish 5 by opening the sliding nozzle. After that, casting is performed on a mold (not shown). The used long nozzle 10 is removed from the ladle 1 after pouring by the long nozzle attaching / detaching device 3 again, and the swivel arm 9 is swung to the position of the long nozzle preheating device 2 and retracted, and the used long nozzle is transferred to the preheating device 2. While the nozzle 10 is housed, one of the plurality of long nozzles preheated in the preheating device 2 is received from the preheating device 2 in preparation for the next pouring, and is turned to the casting position A again.

FIG. 2 and FIGS. 4 to 6 show a long nozzle preheating apparatus 2 according to an embodiment of the present invention. The preheating furnace main body 11 has an inner and outer cylinder wall and a bottom wall lined with refractory bricks. It forms a double cylinder and is fixedly installed on a base 13 on the floor. The space between the outer cylinder wall 11a and the inner cylinder wall 11b of the furnace body 11 is a storage chamber 12 for the long nozzles 10, and in this embodiment, five long nozzles 10 are stored at equal pitches. ing. Outer cylinder wall 11a
As shown in FIG. 4, the sides of the long nozzles 10 that are not adjacent to each other are partially cut off corresponding to the positions of the two long nozzles 10, and this portion is connected to the entrances 14 and 15 of the long nozzles 10.
It has become. Opening / closing walls 16 and 17 are pivotally attached to the outer cylinder wall 11a via brackets 18 fixed to the outside so as to open and close the long nozzle entrances 14 and 15, respectively. An opening / closing drive cylinder 19 for opening / closing the opening / closing wall is pivotally mounted between the cylindrical wall 11a. In FIG. 4, only two long nozzles 10 are stored in the storage chamber, and the other nozzles are not shown for clarity.

At the center of the inner cylinder wall 11 b of the preheating furnace main body 11, a turning shaft 20 of a long nozzle support device is penetrated and supported at the center. A gear is connected via a worm speed reducer 22 to a provided rotary motor 21 that can be rotated forward and backward. Five support rods 23 each extending to the upper part of the long nozzle storage chamber are radially connected to the upper end of the turning shaft 20. As shown in FIGS. 3 and 4, the distal end of the support rod 23 engages with a support pin 10 a projecting to both sides from a long nozzle holder 10 ′ holding the long nozzle 10, and vertically moves the long nozzle 10. It is formed on a mooring portion 23a suitable for supporting in a posture. An annular preheating chamber cover plate 24 having five circumferentially spaced concave portions is provided below the support rod 23 so as not to interfere with the long nozzle 10 carried by the support rod 23. It is connected to. The long nozzle support device includes a support rod 23, a preheating chamber cover plate 24,
And its rotary drive (rotary motor 21, reduction gear 2)
2) and the like, and are integrally rotated by the rotary drive device, whereby the five long nozzles 10 rotate in the same direction in the storage chamber 12. In this case, the long nozzle support device rotates intermittently at intervals of the arrangement pitch of the long nozzles 10. In order to increase the rotation accuracy of the long nozzle support device, a position detector 25 such as an ABSOCODER is provided at the bottom of the base 13 near the lower end of the turning shaft 20.

Referring to FIG. 5 and FIG. 6, the preheating furnace main body 1
A preheating burner 26 is attached to the side of the lower base portion 1, and a combustion gas chamber 27 is defined in the base portion 13 following the preheating burner 26. At least two preheating holes 28 and 29 communicating with the long nozzle storage chamber 12 are formed on the wall, and the combustion gas from one preheating burner 26 is sent into the long nozzle storage chamber 12 through these preheating holes 28 and 29. .

The interval between the two preheating holes 28, 29 is set to be equal to the arrangement pitch of the plurality of long nozzles 10 in the long nozzle storage chamber 12, so that two adjacent long nozzles 10 are connected to these preheating holes 28, 29. 29, the combustion gas is discharged from these two long nozzles 10.
Flows from the lower end of the nozzle into the hollow portion and rises, and propagates also to the outer peripheral side of the long nozzle 10 through the gap between the lower end of the long nozzle and the bottom wall of the furnace main body. The long nozzle 10 is simultaneously preheated. Note that the combustion gas from the preheating holes 28 and 29 also spreads around the other long nozzles 10 that are not located at the positions of the preheating holes 28 and 29 in the long nozzle storage chamber 12, and thus
Long nozzles not aligned with 8, 29 are also heated to some extent.

FIGS. 7 to 10 show the operation when the long nozzle 10 held by the long nozzle attaching / detaching device 3 is taken into the storage chamber of the long nozzle preheating device 2 according to the present invention. 7B is a side view of FIG. 7A and FIG.
8B shows a side view of FIG. 8A. As described in FIG. 1, the long nozzle attaching / detaching device 3 has a pivot arm 9 that can pivot around a column 8 mounted on the column 8 so that the vertical position and the longitudinal position of the arm 8 can be adjusted. The revolving arm 9 has a U-shaped portion 30 attached to the tip thereof, and the U-shaped portion 30 supports a support pin 10 b projecting from a long nozzle holder 10 ′ holding the long nozzle 10. Is supported in a vertical position.

In order to take out the preheated long nozzle 10 from the long nozzle preheating device 2, mount it on a ladle, and after pouring, store the used long nozzle from the ladle into the preheating device 2 first, a long nozzle attaching / detaching device 3 receives the used long nozzle 10 from the ladle 1 at the casting position A, and then the long nozzle preheating device 2
Turn and stop. One long nozzle port 14 of the preheating device 2 faces the column 8 of the long nozzle attaching / detaching device 3, and its opening / closing wall 16 is opened by an opening / closing drive cylinder 19, and the turning arm 9 moves forward as it is in FIG.
(A) and (B), the long nozzle 10 supported by the turning arm 9 is inserted into the storage chamber from the side of the long nozzle preheating device 2. At this time, the long nozzle support portion (U-shaped portion 30) at the tip of the arm is located above the long nozzle support rod 23 of the preheating device 2 (FIG. 8B), and thereafter, the swing arm 9 descends as shown in FIG. Support rod 23
The long nozzle 10 is delivered to the mooring portion 23a (FIG. 2) for each nozzle holder 10 '. At this time, the nozzle holder 10
The support pin 10a on the outer side of the '
3a. Then, the turning arm 9 moves backward as shown in FIG. 10, and the long nozzle supporting device of the long nozzle preheating device 2 turns, and the long nozzle 10 preheated at the position of the preheating hole 28 turns to the position of the long nozzle entrance 14. I do. The swivel arm 9 moves forward again and the entrance 14
From the supporting chamber 23, the preheated long nozzle 10 is received from the support rod 23, and is turned to the ladle side of the casting position A, and the long nozzle 10 is mounted on the ladle 1.

In this embodiment, the long nozzle entrance 14
Is located at a position adjacent to one of the two preheating holes 28, 29, and each time the long nozzle support device intermittently rotates by the arrangement pitch of the long nozzles 10, the long nozzle 10 at the position of one preheating hole 28 is connected to the entrance 14. And the long nozzles not preheated in the preheating furnace are swirled to the position of the other preheating hole 29, so that the two long nozzles 10 are always preheated and the long nozzle entrance 1
4 sequentially. When a long nozzle to be repaired or discarded occurs, the open / close wall 17 of the other long nozzle doorway 15 is opened to take out the long nozzle and replenish a new long nozzle from the doorway 15. Since the long nozzles in the storage chamber 12 which are not located at the positions of the preheating holes 28 and 29 are also heated to some extent by the combustion gas as described above, the long nozzles adjacent to the preheating holes are When turned to a position and preheated, the heat efficiency is good, and the preheat is quickly performed to a required temperature.

[0020]

As described above, according to the present invention, two or more long nozzles are always preheated simultaneously while accommodating the long nozzles in the preheating furnace near the casting position. The long nozzle that is always in a preheated state can be quickly replaced. Even if there is a problem with the long nozzle during casting, at least one or more spare preheated long nozzles are prepared, so that operation interruption due to the trouble of the long nozzle does not occur. Since it is not necessary to suspend and transport the long nozzle with a jib crane or the like when exchanging the long nozzle, handling the preheated long nozzle does not involve danger.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a positional relationship between a ladle on a casting bed, a long nozzle preheating device, and a long nozzle attaching / detaching device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a long nozzle preheating apparatus according to an embodiment of the present invention.

FIG. 3 is a partially cut side view of an upper end portion of a long nozzle applied to an embodiment of the present invention.

FIG. 4 is a top view of FIG. 2;

FIG. 5 is a partially cut-away side view of the long nozzle preheating device shown in FIG. 2;

FIG. 6 is a cross-sectional view taken along the line FF of FIG. 5;

FIG. 7 is a plan view and a side view showing an operation immediately before storing the long nozzle in the long nozzle preheating device.

FIG. 8 is a plan view and a side view showing an operation when the long nozzle is stored in the long nozzle preheating device.

FIG. 9 is a side view showing a state where the long nozzle is housed in the long nozzle preheating device and is supported by the long nozzle support rod.

FIG. 10 is a side view showing a state where the storage of the long nozzle is completed and the turning arm of the long nozzle attaching / detaching device moves backward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladle 2 Long nozzle preheating device 3 Long nozzle attaching / detaching device 9 Rotating arm 10 Long nozzle 11 Preheating furnace main body 12 Storage chamber 14,15 Long nozzle entrance 16,17 Opening / closing wall 20 Rotating shaft 23 Support rod 26 Preheating burner 27 Combustion gas chamber 28,29 Preheating hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-133157 (JP, A) JP-A-1-122264 (JP, A) JP-A-3-71959 (JP, A) 39249 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 11/10 320 B22D 41/56 B22D 41/60

Claims (2)

(57) [Claims] 1. A long nozzle attaching / detaching device installed so that a long nozzle of a ladle at a casting position can be replaced, and a space between an inner / outer cylindrical wall and a bottom wall is provided. A storage room, and multiple long nose in this storage room
Can be stored upright , and a long nozzle is provided on the side.
A preheating furnace having an inlet, a long nozzle support device that rotatably supports the long nozzle so as to sequentially feed a long nozzle in the preheating furnace to a long nozzle entrance of the preheating furnace, and at least two of the long nozzles in the preheating furnace. of the long nozzle at the same time have a combustion gas ejection portion provided in the lower part of該予heat furnace to allow preheating, the long nozzle attachment apparatus is the
Swivels and expands / contracts by holding the long nozzle
The long nozzle of the preheating furnace
At least one of the entrances is a pivot center of the pivot arm.
A long nozzle preheating device for a continuous casting machine, wherein the device is arranged so as to face . 2. The long nozzle support device is adapted to intermittently rotate a plurality of long nozzles in the preheating furnace at an arrangement pitch of the long nozzles, and wherein the combustion gas ejecting section is provided in the preheating furnace. On the bottom wall of the main body, at least two preheating holes are formed at intervals corresponding to the arrangement pitch of the plurality of long nozzles in the main body, and the combustion gas of the preheating burner passes through the preheating holes to the position of the preheating holes. 2. A long nozzle preheating apparatus for a continuous casting machine according to claim 1, wherein the long nozzle is ejected to a long nozzle.