JP3037284B1 - Repair method of tuyere block and repair device used for the repair method - Google Patents

Abstract

The present invention provides a tuyere block repairing technology that minimizes the work of repairing a tuyere block, eliminates a decrease in production efficiency at a steel mill, and reduces costs for repairing a ladle. . A tuyere block (1) at the bottom of a ladle (1) is provided.
c is a repair method for repairing the tuyere area, and when the tuyere mounting member arranged in the tuyere block 1c of the tuyere block 1c is replaced, the tuyere area is worn before the new tuyere mounting member is mounted. The discharge members 11 and 12 for discharging the repair material to the area are provided with the tuyere 1b.
And the repair material 15 is poured into the abrasion region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladle used for casting steel, a metal container such as a tundish or a hot metal ladle used in steel works (hereinafter referred to as "ladle"). More specifically, the present invention relates to a technique for repairing around a tapping tuyere formed at the bottom of such a ladle or around a tuyere for a porous plug that blows gas into the ladle.

[0002]

2. Description of the Related Art Generally, a ladle as described above has a structure in which a fire-resistant lining material or a fire-resistant brick is lined on its inner periphery, and a nozzle cassette for tapping is set on the bottom surface thereof. A hole for setting a porous plug for blowing gas for the purpose of stirring molten steel in a ladle or a so-called tuyere is formed.

When such a ladle is used for a long period of time, erosion or the like occurs on its inner peripheral surface and in a region where the tuyere is formed (hereinafter, referred to as a "tuyere block"). In addition, repair work for the above-mentioned fire-resistant lining material is required. Especially, around the tuyere block of the tuyere block is severely eroded, the replacement of the porous plug is about 8 times for the ladle, and the nozzle cassette for the tapping for tapping is about 14 times. At present, the tuyere block is also being repaired about 40 times, based on the degree of erosion around the tuyere block.

Conventionally, the tuyere block is repaired by cooling the ladle, and then inserting a worker into the ladle to replace the fire-resistant brick in which the tuyere is formed in advance. Alternatively, recently, in the same manner as the method of repairing the inner peripheral surface of a ladle, repair work using a core (Hagoguchi core) has been performed. After cooling, the worker entered the ladle, scraped the melted part, set the tuyere core, poured the refractory lining material (casting material) into the part, and it hardened This is done later by removing the tuyere core.

[0005]

As described above, the tuyere block cannot be repaired unless the entire ladle is cooled. For this reason, the tuyere block repair work takes about one day each for the ladle cooling process, the tuyere block repair process, and the ladle reheating process. Has to be stopped, and there is a problem that production efficiency is deteriorated as a steel mill. In addition, there is a problem that labor is required for the repair work, and the cost rises in terms of labor costs or using expensive materials so as to lengthen the cycle of the repair work of the tuyere block.

The present invention relates to a tuyere block repairing method and a tuyere block repairing method capable of minimizing the work of repairing a tuyere block, eliminating a decrease in production efficiency at a steel mill, and reducing the cost of repairing a ladle. It is an object of the present invention to provide a repairing device used for a vehicle.

[0007]

In order to solve the above-mentioned problems, a method for repairing a tuyere block according to the present invention provides a method for replacing a porous plug disposed in the tuyere of a tuyere block.
Before installing a new porous plug , the repair material is discharged into the frayed area around the tuyere and the repair material is poured and removed.
After that, the porous plug has a shape that can be attached to the tuyere
The repair material is poured into the abrasion region in a state where the configured discharge member is set in the tuyere from the back side of the ladle.

The tuyere block repair device of the present invention can be set on the tuyere block of the ladle bottom from the back side of the ladle, and accommodates the repair material and sets the tuyere on the tuyere. possess a container having a discharge hole to discharge the repair material to the wear area around the tuyere in a state, and a discharge mechanism for discharging the repairing material from said discharge hole, said housing body
Is a cylindrical cylinder with multiple discharge holes formed around it
And the discharge mechanism has a pin that engages with the cylinder.
It is characterized by having a stone . Alternatively, the tuyere block repair device of the present invention can be set on the tuyere of the tuyere block at the bottom of the ladle, protrudes upward from the bottom surface of the ladle in the state set in the tuyere, and surrounds the tuyere. A container provided with a discharge hole for discharging the repair material to the abrasion region, and a fitting portion formed integrally with the container and fitted to the tuyere.

As described above, the tuyere block in which the tuyere to which the tapping nozzle and the porous plug (the tuyere mounting member) are attached is formed relatively frequently and the ladle is cooled. Repair is performed every time the tuyere mounting member is replaced without requiring a process, so even if the ladle is used for a long time, erosion around the tuyere block of the tuyere block is prevented, thereby repairing the tuyere block Can be reduced or eliminated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, with reference to FIG. 1, an example of a procedure for repairing the inner periphery of a ladle and a tuyere block using a casting material will be described. It is not limited to the following method).

At the bottom of the ladle 1, a tapping tuyere 1a in which a nozzle cassette for tapping is set, and a porous plug in which a gas plug is blown for stirring the molten steel in the ladle. The tuyere 1b is formed. In this case, the tapping for tapping 1a is tapered and the lower half is tapered such that the upper half is reduced in diameter so that the cast steel can be easily tapped and the nozzle cassette can be easily mounted from below. The porous tuyere 1b is formed in a tapered shape that expands downward. The porous tuyere 1b expands downward (toward the upper side) so that the porous plug can be easily mounted and gas can be efficiently blown. It is formed in a tapered shape.

In the repair work of the entire ladle including the tuyeres 1a and 1b, first, a tuyere core having a shape corresponding to the tuyeres 1a and 1b is set, and in this state, the casting material is set. To repair the bottom area of the ladle. Next, the core 3 corresponding to the inner surface shape of the ladle 1 is set, the casting material is transported from the silo 5 to a position above the ladle by a conveyor 6 or the like, and the core 3 is rotated while the rotary filling device 7 is rotated. Pour it evenly between the inner peripheral surface of ladle 1. Then, after the casting material has hardened, the core 3 is removed, and the tuyere cores are removed, thereby repairing the ladle 1 having a tapered tuyere formed on the bottom surface as shown in the figure. Is completed.

When a ladle is actually used, each tuyere 1a, 1
The nozzle cassette and the porous plug set in b are the most severely damaged parts. As described above, the replacement operation of the porous plug is about 8 times and the nozzle cassette is about 14 times. The tuyere block has been repaired about 40 times. In this case, the porous plug and the nozzle cassette can be replaced without cooling the ladle, but for the tuyere block, after the ladle is cooled, the repair work using the tuyere core described above is required. .

As described above, the present invention is characterized in that the tuyere block is repaired when the porous plug or the nozzle cassette is replaced, thereby simplifying the tuyere block repairing work. Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG.

In the drawing, reference numeral 1c denotes a tuyere block in which a porous tuyere 1b on which a porous plug is set is formed, and shows a state where the porous plug is removed and the repair device 10 is set. Around the porous tuyere (around the tuyere), its surface is melted down and is in a shaved state as shown in the figure.

The repair device 10 is inserted into the porous tuyere 1b from the back side of the ladle, and is gradually reduced in diameter so as to fit into the porous tuyere 1b. And a cylindrical portion 12 formed integrally with the portion and projecting upward from the bottom surface of the ladle when fitted. An elongated hole 1 as shown in FIG.
2a is formed. Since the long hole 12a allows the repair material 15 to flow into the erosion area around the tuyere, the formation position is above the imaginary bottom surface 1d of the ladle to be repaired, and the repair material spreads over the entire periphery. As described above, it is preferable to form them at regular intervals (for example, at intervals of 90 degrees).

The cylindrical portion 12 functions as a container for discharging the repair material 15, and the cylindrical portion 12 houses a piston 20 as a discharge mechanism for discharging the stored repair material. That is, the piston 20 is removed and the repair material 1
The repair material 15 is filled in the erosion area by housing the cylinder 5 in the cylindrical portion 12 and pressing the piston 20. In this configuration, the piston 20 can be manually operated, but as shown in FIG.
0b may be formed, and a pinion 25a driven by the drive motor 25 may be meshed with the rack and driven in the direction of the arrow. In this case, the reciprocation of the piston is controlled by operating the operation switch 27.

The repair device 10 as described above is provided on the back surface of the ladle 1 where the porous tuyere 1b is formed.
By forming the engagement holding portion 30 in advance and holding the base 10a supporting each of the above members here, the mounting / removing operation can be easily performed.

Next, a procedure of a repair operation using the above-described repair apparatus 10 will be described.

First, the damaged porous plug is removed, and in this state, the fitting portion 11 and the cylindrical portion 12 filled with the repair material 15 are fitted into the porous tuyere 1b. Then, the base 10a supporting the piston 20, the motor 25 and the like is engaged and held by the engagement holding portion 30, and the piston rod 20a
Rack 20b and the pinion 25a of the motor 25 are engaged with each other. In addition, such mounting work, equipment of the steel mill,
When the arrangement of the ladle is considered, the ladle may be turned over.

Next, in this state, by operating the operation switch 27, the piston 20 is pushed in, and the repair material 15 is discharged from the long hole 12a formed in the cylindrical portion 12 described above. The repair material 15 flows into the erosion area around the tuyere, and after this hardens, becomes the repair part 15a filled in the erosion area. In addition, when the ladle is turned over and the repair device 10 is mounted, the filling operation is performed with the ladle upright again.
After the filling operation is completed, the base 10 and the fitting portion 1
1. Remove the cylindrical portion 12 and set the porous plug as in the conventional case.

As described above, when the porous plug is replaced, the tuyere block 1c, which has been conventionally cooled with a ladle, is also repaired by performing a repair work around the tuyere.
Repair work becomes unnecessary, the operation efficiency of the ladle can be improved, and the cost required for the repair work can be reduced. In addition, since the erosion area is repaired every time the porous plug is replaced, the tuyere block does not need to be formed of an expensive material that is hardly eroded.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and may be configured as follows, for example.

In the above configuration, the repair device set on the tuyere is fitted from the back side of the ladle, but may be configured so that it can be set on the tuyere from the opening side of the ladle. The overall shape is not particularly limited as long as the repair material to be discharged does not leak out of the ladle and the tuyere mounting member can be mounted after the work is completed. The discharge of the repair material may be performed by using a pump or the like from the storage part outside the ladle, in addition to the configuration performed by the above-described piston, and the actual discharge may be performed through the hole described above. Also,
A configuration using a nozzle or the like may be used. The container for storing the repair material may be configured, for example, in a conical shape instead of the cylindrical shape described above, and in this case, the repair material may be discharged from around the top of the tuyere. Further, in the above-described embodiment, an example in which a repair device around the porous tuyere is used has been described. However, even when the cassette nozzle set in the tapping tuyere 1a as shown in FIG. It is also possible to repair around the tuyere.

[0025]

As described above, according to the present invention, it is possible to reduce or eliminate the work of repairing a tuyere block when using a ladle, thereby preventing a reduction in production efficiency at a steel mill. Further, the cost for repairing the ladle can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a ladle repair technique to which the present invention can be applied, and is a diagram illustrating a procedure for repairing a ladle using a core and a tuyere core.

FIG. 2 is a diagram showing an embodiment of a tuyere block repairing work according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ladle, 1a ... Steel tapping tuyere, 1b ... Porous tuyere, 1
c: tuyere block, 3: core, 10: repair device, 11 ...
Fitting portion, 12: cylindrical portion, 15: repair material, 20: piston.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiichi Yasui 2-1-17 Shibadaimon, Minato-ku, Tokyo Intocast Japan Co., Ltd. (72) Inventor Hideo Omori 1st Chidoricho, Ichikawa-shi, Chiba Prefecture In the brick factory (56) References JP-A-7-260369 (JP, A) JP-A-52-153833 (JP, A) JP-A-9-314315 (JP, A) JP-A-4-371363 (JP, A A) JP-A-4-94863 (JP, A) JP-A-9-239502 (JP, A) JP-A-7-214292 (JP, A) JP-A-8-117988 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B22D 41/02 F27D 1/16

Claims (4)

(57) [Claims] 1. A method of repairing a tuyere block at the bottom of a ladle around a tuyere block, wherein a new polar plug is replaced when a porous plug disposed in the tuyere block of the tuyere block is replaced.
Before mounting of the sprag, after removal by pouring the repair material while discharging the repair material to the wear area around the tuyere, the
A repair material is poured into the frayed area with a discharge member configured to have a shape in which a porous plug can be attached to the tuyere set in the tuyere from the back side of the ladle. How to repair the mouth block. 2. A tuyere block from the back of the ladle to the bottom of the ladle.
Can be set in the tuyere of
With the tuyere set in the worn area around the tuyere
A container having a discharge hole for discharging the repair material;
A discharge mechanism for discharging the repair material from the discharge holes, wherein the container has a cylindrical shape having a plurality of discharge holes formed therearound.
It has a cylinder shape, and the discharge mechanism is attached to the cylinder.
A repair device having an engaging piston. 3. The driving device according to claim 1, wherein the piston is driven by a driving motor.
3. The device according to claim 2, wherein the device is driven by a force.
Repair equipment. 4. Set in the tuyere of the tuyere block at the bottom of the ladle
A possible repair device, set in the tuyere
To project upward from the bottom of the ladle,
A container provided with a discharge hole for discharging the repair material;
Is formed integrally with the container and is fitted to the tuyere.
A repair device characterized by having a part.