JP2603603Y2 - Immersion pipe repair equipment for vacuum degassing tanks - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for repairing an immersion pipe of a vacuum degassing tank for repairing a refractory erosion portion of an immersion pipe provided at a lower part of an RH degassing tank with an irregular refractory. .

[0002]

2. Description of the Related Art In general, it is well known that molten steel produced in a steel furnace such as a converter is degassed and decarburized using a vacuum degassing apparatus to produce clean steel. Not only is it applied to alloy steels. As a vacuum degassing device, for example, two dip tubes are provided at the bottom of a degassing tank,
An RH method is known in which molten steel is guided into a degassing tank from one suction-side immersion pipe, and the molten steel subjected to vacuum degassing is discharged from the other discharge-side immersion pipe to continuously perform vacuum degassing.

The immersion pipe provided in such a degassing tank of the RH type has a problem that the lower part of the immersion pipe immersed in the ladle during the molten steel processing is significantly melted and worn due to contact with the slag and the molten steel. As a result of repeated thermal expansion and contraction due to being used for molten steel processing, cracks and damages are severe, and irregular-shaped refractories are peeled off, resulting in breakage due to falling off and shortening the service life. Although the refractory material of the immersion pipe has been improved and the construction method has been improved to extend the life of the immersion pipe, this is not sufficient, and the repairs to be performed before replacing the immersion pipe must be improved. By doing so, the service life can be extended as a whole.

As an apparatus for repairing an immersion pipe provided in an RH type degassing tank, for example, Japanese Patent Publication No. Sho 63-26173 discloses a method for raising and lowering the inner and outer refractories of an immersion pipe by raising and lowering an inner lining pipe and an outer lining pipe. There is disclosed a method of repairing by spraying an amorphous refractory while performing the repair. By the way, as shown in FIG. 2, the portion of the two immersion pipes 4 provided at the lower part of the RH type vacuum degassing tank where the refractory is most damaged is the lower damaged part 1 from the lowermost part to the inner side, The inner damaged portion 2 and the outer damaged portion 3 of the immersion tube 4 are less damaged than the lower damaged portion 1.

[0005]

As described above, although the immersion pipe of the vacuum degassing tank is most susceptible to damage from the bottom to the inner surface, the above-mentioned Japanese Patent Publication No. Sho 63-26173 is disclosed.
As disclosed in Japanese Unexamined Patent Publication, a conventional immersion pipe repairing apparatus repairs the inside of the immersion pipe by spraying an undefined refractory from a lining pipe to a refractory evacuating portion on an inner surface and an outer surface.

For this reason, it is not suitable for repairing a refractory damaged portion from the lowermost portion to the inner surface side of the most severely burned immersion tube, so it takes a long time to repair, and it is difficult to repair efficiently and firmly. There was a disadvantage that it was. The present invention solves the above-mentioned problems of the prior art, and efficiently and firmly repairs the most easily damaged refractory portion from the lowermost end to the inner surface side of a dip tube provided in a vacuum degassing tank. It is an object of the present invention to provide an apparatus for repairing a submerged pipe of a vacuum degassing tank.

[0007]

According to the present invention, there is provided an apparatus for repairing an immersion pipe provided at a lower portion of a vacuum degassing tank, the center opening having a size substantially equal to the lower surface of the immersion pipe. And an upper and lower movable annular table on which an irregular refractory for repair is placed on the upper surface, and the irregular refractory placed on the annular table is raised to lower the refractory erosion part at the lower part of the immersion pipe from below. An elevating device for crimping, and an amorphous refractory crimped from below onto the refractory erosion portion at the lower part of the immersion pipe, can be reciprocally driven in the radial direction from the inner surface side of the opening of the center portion of the annular table, and can be driven in the circumferential direction. And a hammer device for pressing and repairing a hammer that can be driven to rotate to repair the immersion pipe of the vacuum degassing tank.

[0008]

The irregular refractory placed on the annular table is pressed upward from below toward the refractory erosion portion at the lower part of the immersion pipe, and the irregular refractory is reciprocated in the radial direction from the inner surface side. Repair is performed by repeating the stamping work of pressing the hammer while rotating in the circumferential direction. For this reason, the refractory near the lower part of the immersion pipe which is most damaged can be efficiently and firmly repaired, so that the life of the immersion pipe can be drastically improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a preferred embodiment of the present invention. As shown in FIG. 1, a plurality of hydraulic lifting cylinders 6 provided on a support frame 14 provided on a trolley 13 which can be moved by wheels 12 allow a spring seat plate 15 having a central opening 15a to be movable up and down. Supported. An annular table 11 having a size substantially equal to the lower surface of the immersion tube 4 and having a central opening 11a is supported via a plurality of springs 7 disposed on the spring seat plate 15.

A turning table 10 is supported on a carriage 13 by a support table.
It is installed rotatably in the horizontal direction via 16. As means for turning the turntable 10, for example, a gear 17 is provided on the outer peripheral surface of the turntable 10, a pinion gear 18 is meshed with the gear 17, and the pinion gear 18 is connected to a motor 20 via a gear mechanism 19. It can be structured. The turning means of the turning table 10 is not limited to this, and it goes without saying that another turning means can be appropriately selected and used.

Further, with a bearing 21 provided at the center of the turning table 10 as a fulcrum, a support rod 22 is supported so as to reciprocate through a center opening 15a of the spring seat plate 15 and a center opening 11a of the annular table 11. The hammer 8 is attached to the upper part of the support rod 22. The hydraulic cylinder 9 provided on the swivel table 10 is connected to the middle of the support rod 22, and when the cylinder 9 is extended and retracted, the hammer 8 on the support rod 22 is indicated by a dotted line from a central position shown by a solid line in FIG. It reciprocates to the position on the inner surface side of the immersion tube 4 shown. The front surface of the hammer 8 is tapered so that the immersion pipe 4
It is desirable to keep it along the inner surface of the object. If necessary, the swivel table 10 can be made up and down so that the hammer 8 attached to the upper part of the support rod 22 can be moved up and down.

Next, the operation of the present invention will be described. First, the carriage 13 is mounted on a repair carriage (not shown), and is moved to a repair place of the immersion pipe 4 and stopped. The repair trolley is raised using a lifting device (not shown), and the height is adjusted so that the lower damaged portion 1 of the immersion pipe 4 is located at the position of the upright hammer 8. In addition, as mentioned above, the hammer 8 is structured to be raised and lowered,
The height may be adjusted by raising and lowering the hammer 8.

On the annular table 11, an irregular refractory 5 is placed in a state corresponding to the damaged shape of the lower damaged portion 1 of the immersion tube 4. As the amorphous refractory 5, for example, a high-alumina plastic (Al ₂ O ₃ : 83% by weight, SiO ₂ : 10% by weight) is used. Good. Continue lifting cylinder 6
, The irregular refractory 5 placed on the annular table 11 is pressed against the lower damaged portion 1 of the immersion tube 4 from below to be crimped. At this time, since the annular table 11 is supported via the spring 7 on the spring seat plate 15, the pressing force acts evenly on the irregular-shaped refractory due to the buffering action of the spring 7, so that uniform crimping is achieved. When a pneumatic cylinder is used as the lifting cylinder 6, the spring 7 and the spring seat plate 15 can be omitted because the cushioning function is provided, and the annular table 11 can be directly supported by the pneumatic cylinder.

Subsequently, by extending and retracting the cylinder 9, the hammer 8 attached to the upper part of the support rod 22 is reciprocated in the direction of the arrow, and the hammer 8 presses the lower refractory portion 1 downward from the irregular shaped refractory 5 so as to protrude. Is repaired by repeating the stamping operation that presses radially from the inside surface several times. After stopping the stamping operation by the hammer 8 at an appropriate timing, the motor 20 is driven to rotate the swivel table 10 via the pinion gear 18 and the gear 17 so that the hammer 8 attached to the upper part of the support rod 22 is rotated by a predetermined angle. Turn in the circumferential direction and stop turning at the next repair position immediately next to it. Subsequently, the inner surface side of the irregular-shaped refractory 5 is stamped using a hammer 8. By repeating such an operation, the irregular refractory 5 is firmly pressed to the lower damaged portion 1 over the entire inner periphery of the lower part of the immersion pipe 4.

As shown in FIG. 3, when the conventional lining pipe is used for repairing by spraying an irregular-shaped refractory, the number of times the immersion pipe has been used has been about 100 times, whereas the apparatus of the present invention has been used. In the case of repair, the number of times the dip tube was used could be extended significantly to a life of 150 to 200 times.

[0016]

As described above, according to the device of the present invention, the irregular refractory placed on the annular table is pressed against the refractory damaged portion below the most severely damaged immersion pipe, and Since the refractory is repaired while being pressed by a hammer from the inside of the immersion pipe by stamping, the repair can be performed efficiently and firmly, and the life of the immersion pipe is greatly extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a damage state of a dip tube provided in a vacuum degassing tank.

FIG. 3 is a bar graph showing the life of the immersion tube (the number of uses) in comparison with the conventional one and the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower damaged part 2 Inner side damaged part 3 Outer side damaged part 4 Immersion pipe 5 Irregular refractory 6 Elevating cylinder 7 Spring 8 Hammer 9 Cylinder 10 Swivel table 11 Ring table 12 Wheel 13 dolly 14 Support frame 15 Spring seat plate 16 Support Table 17 Gear 18 Pinion gear 19 Gear mechanism 20 Motor 21 Bearing 22 Support rod

Claims (1)

(57) [Scope of request for utility model registration] An apparatus for repairing a dip tube provided at a lower portion of a vacuum degassing tank, wherein the refractory for repair is formed on a top surface having a central opening having a size substantially equivalent to a lower surface of the dip tube and having a central opening. An annular table that can be lifted and lowered, an elevating device that lifts the amorphous refractory placed on the annular table and presses the refractory erosion portion under the immersion pipe from below, and a refractory erosion below the immersion pipe A hammer device for pressing and repairing the irregular-shaped refractory crimped to the portion from below from the inner surface side of the opening at the center of the annular table, by pressing a hammer that can be reciprocated in the radial direction and that can be driven to rotate in the circumferential direction. An apparatus for repairing a submerged pipe in a vacuum degassing tank.