JPH09302409A - Device for repairing immersion tube in rh vacuum degassing vessel and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick repairing device of a refractory at the lower side of an RH vacuum degassing vessel, particularly at the inner and the outer sides of immersion tubes. SOLUTION: In the repairing device 1 of the immersion tubes in the vacuum degassing vessel 30, a turn table positioned at the lower part of the vacuum degassing vessel 30 and having a rotary center shaft on the extension of the center line of this device is provided and two pieces of supporting parts 3a, 3b are stood at almost center part on the turn table. A carrying body 6a having the rotating axis on the extending line of the axis of one side of the immersion tube 31a and a thermal-spraying nozzle for thermal-spraying repairing material is arranged by fitting to one side of the supporting post 3a. Then, the carrying body 6b having a rotating axis on the extending line of the axis of the other side of the immersion tube and a blowing nozzle 16 for blowing repairing material is arranged by fitting to the one side of the supporting post 3b. In this repairing method of the immersion tube, the repairing device arranging the repairing material carrying bodies rotatably and elevatably to each and the vacuum degassing vessel 30 completing the vacuum degassing treatment, are carried on the repairing device 1 for immersion tube in the vacuum degassing vessel under hot state, and the thermal-spraying repairing on the inner surfaces of the immersion tubes 31 and the blowing repairing of the outer surface of the other side of the immersion tube are simultaneously executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid repair of refractory materials on the lower side of an RH vacuum degassing tank, especially on the inner and outer surfaces of a dip tube.

[0002]

2. Description of the Related Art In recent years, the vacuum degassing and refining ratio of molten steel has been increasing due to the sophistication of steel quality. Therefore, the load on the refractory in the vacuum degassing tank also increases, and the melting loss of the refractory in the vacuum degassing tank also increases. . With the increase in the amount of refractory melting, the number of refractory replacements increases,
The service life of the vacuum degassing tank has been shortened, which has been a factor in reducing its operating rate.

Conventionally, as a method of repairing such a vacuum-degassed immersion pipe, there is a method in which a molding frame is attached to the melting point of the refractory material, and an irregular-shaped repair material is poured in to repair it. For example, JP-A-60-215712 and JP-A-63-166923.
No. 2, JP-A-2-179817, and JP-A-4-88116.
And Japanese Patent Application Laid-Open No. 5-9553. In addition, as disclosed in Japanese Examined Patent Publication No. 3-23605, a method of spraying a refractory repair material on a melt-damaged portion with a spray nozzle has also been proposed.

When repairing the melted part of the refractory material of the dip pipe, the outer side surface is relatively close to the melted part, so that the repair worker can spray the refractory material, but the dip pipe can be repaired. When repairing the inner surface of the, it is necessary to remove the dip tube, and the vacuum degassing tank must be stopped for a long time, which causes a decrease in the temperature of the degassing tank refractory and is one of the factors that shorten the service life. Was there.

[0005]

Under the present circumstances in which the number of steel grades requiring a degassing refining process is increasing, refractory materials for vacuum degassing tank dip pipe inner and outer surfaces which are efficient in a short time and have excellent durability are provided. A repair method was requested. However, in the conventional repairing method, since the spraying or spraying was appropriately carried out by the operator on the melted immersion pipe, it took a long time inevitably. Such work has various problems such as poor reliability for repair work and many labor and wasted points.

Therefore, in order to perform a quick repair, the repair can be performed hot (after the vacuum degassing tank is used, as it is) without removing the dipping pipe, and from the environmental aspect, the worker can approach the repaired object. It was desired that the inner surface and the outer surface of each dip tube can be repaired independently and simultaneously in the same device, independently of each other. A matched repair device and method therefor are provided.

[0007]

The present invention was developed in order to solve the above problems, and the gist thereof is as follows. In a dip tube repair device for a vacuum degassing tank, a turntable is provided below the vacuum degassing tank and having a rotation center axis on the extension of the centerline of the device. Two support posts are erected, a carrier having a rotation axis on the extension line of one immersion tube axis, and a thermal spray repair material spray nozzle is fitted to one of the support posts. In addition to the above, the carrier with the rotation axis on the extension line of the other immersion pipe axis and the spray nozzle for the spray repair material is fitted and arranged on the other support post to transfer the repair material. The body must be installed so that it can rotate and move up and down.

[0008] The immersion pipe repairing device is installed on a trolley, and tanks for storing each repairing material are installed at positions close to each other on the trolley so that they can be integrally transported on a rail. . When repairing a submerged pipe in a vacuum degassing tank, the vacuum degassing tank that has undergone the vacuum degassing process is transferred to the submerged pipe repairing device in the vacuum degassing tank while hot, and the inner surface of one of the submerged pipes is sprayed. A carrier with a spray nozzle for repair material can be repaired by rotating and moving up and down, and the outer surface of the other immersion pipe can be repaired by rotating and lifting a carrier with a spray nozzle for repair material. It is in the immersion pipe repairing apparatus and repairing method of the RH vacuum degassing tank, which is mainly used.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have conducted various studies to solve the above-mentioned problems, have repeatedly developed a method for repairing the inner and outer surfaces of a submerged pipe quickly and efficiently, and After studying the possibility of repairing the vacuum degassing tank after it has been used, the present invention has been completed. That is, according to the present invention, the outer wall surface of one of the dipping tubes of the RH-type vacuum degassing device is automatically sprayed and repaired according to a predetermined program, and the other dipping tube is repaired. Has developed a device that enables simultaneous automatic spraying repair of its inner wall surface in parallel according to a predetermined program.After finishing these operations, the turn on which the device is placed By turning the table 180 ° and automatically performing the same work for each unrepaired immersion pipe, the repair time can be shortened and more efficient and reliable hot repair of the immersion pipe is possible. It was done.

The present invention will be described in detail below with reference to FIGS. FIG. 1 shows the entire apparatus of the present invention. In order to facilitate understanding of the present invention, dipping pipes 31a and 31b of a vacuum degassing tank 30 to be repaired are present at predetermined positions above the apparatus. It showed the state. Repair device 1 in the figure
A post 3a on the left side and a post 3b on the right side are erected on a turntable 4, and a servomotor 17 for rotating the table 4 is arranged on the turntable 4. The support post 3a has a screw type lifting mechanism using a ball screw installed therein, and the carrier 6a of the thermal spray nozzle 5 for repairing the inner surface of the immersion pipe is fitted into the support post 3a and screwed inside the support post. And
It can be moved up and down by driving the servo motor 7. Further, the thermal spray nozzle 5 has a servo motor 8 at its lower part.
When the belt 9 erected on the pulley between the two shafts slides due to the drive, the thermal spray nozzle itself is rotatable so as to rotate 360 °.

On the other hand, the support post 3b is also internally provided with a screw type elevating mechanism using a ball screw, and the servo motor 11 controls the elevating and lowering of the spray nozzle 10 for repairing the outer wall surface of the immersion pipe. In order to rotate the outer circumference of the immersion tube, the servo motor 12 is driven so that the belt 13 slides to operate via the support column and the arm. That is, since the spray nozzle 10 is involved in the repair of the outer surface of the dip tube, the spray nozzle 10 is rotatable above the carrier 6b.
4 is installed, and a spray nozzle 10 is provided on the upper part of the column.
It has an arm 15 for supporting. Further, a servo motor 16 for rotating the spray nozzle 10 itself is also attached to the lower part of the spray nozzle.

Since these devices are installed in a place where much dust is generated, dust-proof measures are taken for the devices,
The whole main part of the device is covered with a cover 20 made of, for example, an iron plate,
Prevents dust from entering the equipment. In addition, the cover is also specially devised, and a sliding type opening / closing lid 23 that can be opened / closed is attached to the inlet / outlet of the thermal spray repair nozzle so that the lid can be opened when the thermal spray nozzle is lifted and closed when it is stored. I am collecting. Furthermore, on the spray nozzle side, a guard 22 is attached to the upper part of the column 14 to protect the apparatus from the molten metal and slag remaining in the vacuum degassing tank. There is. Similarly, the support arm 15 is also provided with an arm cover 21 that can move in association with the movement of the arm.
It protects the drive unit of the spray nozzle.

The carriers 6a and 6b are respectively provided with support posts 3a and 3b.
Since it is fitted and supported by b and moves up and down, the carrier sides of the support posts 3a and 3b have openings over the entire length of the support posts, and in order to prevent dust from entering through the openings, Curtains 24a and 24b are provided and move up and down with the movement of the carriers 6a and 6b to prevent dust from entering. Further, the curtains 24a and 24b are wound and unwound according to the vertical movement of the curtains by the curtain storage tools 25a and 25b installed on the upper and lower parts of the support posts 3a and 3b. Since the curtain 24 is made of an elastic material, it does not require power for winding and unwinding the storage device.

Further, in this apparatus, as shown in FIG. 3, a tank 27a containing a thermal spray repair material and a tank 27b containing a spray repair material are mounted side by side on a traveling carriage 26. At the same time, it has been considered that it is possible to easily move to the repair location by simply running on a rail.

The movement of each part of the device of the present invention will be described below based on an example in which the immersion pipe is repaired. First, the repair apparatus 1 is installed by moving the traveling carriage 26 to a predetermined position below the RH vacuum degassing tank 30 in the hot state after operation. After that, the opening / closing lid 23 of the cover 20 covering the upper part of the thermal spray nozzle 5 is opened, and the servomotor 7 is driven to raise the thermal spray nozzle 5 into the immersion pipe 31a. The thermal spray nozzle is capable of spraying and repairing the reflux pipe 32 joined to the upper part of the immersion pipe in terms of equipment, and the reflux pipe 32a including the reflux pipe 32a portion is included depending on the damage condition of the internal refractory of the reflux pipe. While the internal refractory material of the immersion pipe 31a is directed from the upper side to the lower side, the thermal spray nozzle 5 is rotated by the rotational force of the servo motor 8 to perform the thermal spray repair over the entire surface mainly at the thermal spray damaged portion.

On the other hand, at approximately the same time, the spray nozzle 10 raises the outer surface of the immersion pipe 31b by the driving force of the servomotor 11, and repairs the outer wall surface refractory material from above the immersion pipe 31b to below it. In this case, the spray nozzle 10 is rotated by the rotational force of the servo motor 12 along the outer peripheral wall of the dip tube 31b while maintaining a predetermined interval and continues spraying the repair material. The spray nozzle can be rotated by the servo motor 16 by the servo motor 16. The spraying angle of the repair material is changed according to the degree of damage on the outer surface, so that not only the spray from the vertical surface but also an appropriate angle with respect to the vertical surface. Can be sprayed. Moreover, since the spray nozzle 10 cannot be inserted into this gap because the outer wall distance between the immersion pipes 31a and 31b is small, the spray nozzle itself is designed to be inclined, and the outer surface of the gap portion is repaired by spraying. Repair is performed by freely rotating and tilting the tip of the nozzle.

Repair of the inner surface of the immersion pipe 31a and the immersion pipe 31b
When the outer surface of the turntable 4 has been repaired, the respective repair nozzles are lowered, and then the servo motor 17 is driven to turn the turntable 4
Is rotated 180 °, and then the same operation as the previous operation is performed on each unrepaired immersion pipe, thereby completing the repair of both immersion pipes 31a and 31b.

Regarding the supply of the repair material to each repair nozzle, the repair material is supplied from the repair material storage tank 27 mounted on the traveling carriage 26, and the auxiliary gas such as LP gas, oxygen gas, compressed air and water is supplied. The material can be taken in through a hose from the supply pipe of each auxiliary material arranged near the set position of the repair device 1.

In addition, the inner surface of the immersion pipe 31 is sprayed and the outer surface is sprayed, and different repair techniques are adopted.
The outer surface of the immersion pipe 31 may have the metal part of the flange exposed, and since the flame is used in the spray nozzle, the metal part of the flange may be melted, which causes an inconvenient situation when the immersion pipe is removed. On the other hand, the inner surface side of the dip pipe 31 is a place where molten steel recirculates, and as a result of being exposed to more severe conditions than the outer surface, the melting loss of refractory materials is large, and thermal spray repair is adopted as a more effective repair. It was done. When performing these repairs, the operation of each servo motor, the amount of repair material, the time, etc. should be in accordance with a predetermined program.
The work is automatically performed by remote control according to a fixed pattern, and it is no longer necessary for the worker to approach the repair dip tube.

[0020]

According to the present invention, when repairing a dip tube, it is not necessary to remove the dip tube for repair, and repair can be performed hot. Therefore, it is expected that repair cost will be significantly reduced.
In addition, these repairs can be performed by spraying the outer surface of the dip pipe on the one hand, and spraying the inner surface on the other hand, which can be performed simultaneously in parallel, so that it can be done in a short time and without relying on manual work. It can be done automatically and is extremely useful for repair work.

[Brief description of drawings]

FIG. 1 is an overall view showing the positional relationship between an example of the device of the present invention and the lower part of an RH vacuum degassing tank.

FIG. 2 is a partially enlarged view of an example of the device of the present invention.

FIG. 3 is a view showing an example in which the device of the present invention is mounted on a trolley.

[Explanation of symbols]

 1 Repair Device 3a, 3b Support Post 4 Turntable 5 Spray Nozzle 6a, 6b Conveyor 7 Servo Motor 8 Servo Motor 9 Belt 10 Spray Nozzle 11 Servo Motor 12 Servo Motor 13 Belt 14 Strut 15 Support Arm 16 Servo Motor 17 Servo Motor 20 Cover 21 Arm cover 22 Protective equipment 23 Opening / closing lid 24 Curtain 25a, 25b Storage tool 26 Traveling vehicle 27a, 27b Repair material tank 30 Vacuum degassing tank 31a, 31b Immersion pipe 32a, 32b Recirculation pipe

Claims (9)

[Claims] 1. A vacuum degassing tank submerged pipe repair apparatus, wherein a turntable is provided below the vacuum degassing tank and having a center axis of rotation on an extension of the centerline of the apparatus. Two support posts are erected in the central part of the, and has a rotation axis on the extension line of one immersion tube axis,
A carrier with a thermal spray nozzle for thermal spray repair material is installed by fitting it to one of the support posts, and has a rotation axis on the extension line of the immersion pipe axis of the other, and sprays the spray repair material. An immersion pipe repairing apparatus for an RH vacuum degassing tank, characterized in that a carrier having a nozzle is fitted and disposed on the other support post, and the repair material carrier is installed so as to be rotatable and vertically movable. 2. The immersion pipe repairing apparatus according to claim 1, further comprising a cover for covering each standing support post and each repairing material carrier from the outside.
H Vacuum degassing tank immersion pipe repair device. 3. The immersion pipe for an RH vacuum degassing tank, wherein a cover for covering the entire immersion pipe repairing apparatus according to claim 2 is provided with an openable / closable lid at an inlet / outlet port of a spraying nozzle for a spraying repair material. Repair device. 4. A cover for covering the whole of the immersion pipe repairing apparatus according to claim 2, wherein a cap-like residue residue fall protector is attached above a carrier having a spray nozzle for spraying repair material. Characteristic RH vacuum degassing tank dip tube repair device. 5. The cover for covering the entire immersion pipe repair device according to claim 2, wherein the cover for covering the spray nozzle support arm of the spray repair material is rotated in the same manner as the spray nozzle is rotated. Immersion pipe repair device for vacuum degassing tank. 6. The immersion pipe repair apparatus according to claim 1, wherein a curtain covering the opening is provided at a fitting opening between each of the upright support posts and each of the repair material transfer bodies arranged on the support post. An immersion pipe repair for an RH vacuum degassing tank, characterized in that the curtain is wound up and unwound by a storage tool installed above and below a support post in accordance with the raising and lowering of the repair material carrier. apparatus. 7. The immersion pipe repairing device according to claim 1, wherein the immersion pipe repairing device is installed on a dolly, and tanks containing respective repairing materials are installed at positions close to each other on the dolly to integrally An immersion pipe repairing device for an RH vacuum degassing tank, which can be transported on a rail. 8. When repairing the immersion pipe of the vacuum degassing tank, the vacuum degassing tank after the vacuum degassing process is transferred to the immersion pipe repairing apparatus of the vacuum degassing tank in a hot state. Then, the inner surface of one of the immersion pipes is repaired by rotating and moving up and down the carrier with the spray nozzle for the spray repair material, and the outer surface of the other immersion pipe is repaired with a spray nozzle for the spray repair material. A method for repairing a submerged pipe in an RH vacuum degassing tank, characterized by repairing by rotating and moving up and down. 9. The immersion pipe repair method according to claim 8, wherein automatic repair is performed by remote control in accordance with a predetermined repair pattern.