JPH0331491Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a refractory structure for a ladle sludge removal opening, and particularly to a refractory structure using iron plate reinforcement bricks of a specific shape.

Conventional technology When used in general steel pots, the top surface was held down by being integrated with the bottom of the slag removal opening.
The operating conditions became more severe due to the operation of radar furnaces, etc., and the conventional structure could no longer meet the requirements.

For this reason, the use of bricks has been promoted, but the regular wall brick shape is subject to impact and tensile forces when removing slag and bare metal, as well as loads in the axial direction when the entire pot is tilted or turned over. Defects such as sticking and falling off are known.

As a countermeasure to these problems, a construction method called the jack arch structure is being used as shown in Figure 5, but this construction method uses a special brick splitting method to prevent the bricks from floating in the direction of arrow b. Various problems are known, such as the need to press the bricks 10 on both sides in the direction of arrow a, and the method of filling castable refractories around the brick assembly is also difficult. There is.

Problems that the invention aims to solve When removing slag, the bricks on the side of the bedding wear at the ladle removal opening cracked horizontally due to the impact and thermal spalling of the scraping device, resulting in falling accidents. The refractory structures currently in use have problems such as complexity in construction.

Means for Solving the Problems The inventors of the present invention have successfully developed the present invention as a result of various studies and experiments to solve the problems of the conventional method as described above. Although the configuration is as specified in the claims of the above-mentioned utility model registration, it will be explained in detail based on the attached drawings showing a specific example of the present invention.

Figure 1 is a sectional view of the ladle slag removal port of the present invention, Figure 2 is a perspective view of the same, and Figures 3 and 4 are perspective views of U-shaped and L-shaped bricks in cross section used in the structure of the present invention. be.

The specially constructed bricks used in the structure of this invention are
As shown in the figure and FIG. 4, a brick 1 having a U-shaped or L-shaped cross section is provided with a reinforcing iron plate 4 on its side (one or both sides) and fixed, and a concave or L-shaped portion 8 is formed. At least 1 on one end face of the side having
The structure is made of bricks in which Y-shaped studs 2 are installed, but depending on the case, the structure may be such that the reinforcing iron plate 4 is not attached.

As shown in FIGS. 1 and 2, the brick 1 having the shape described above is arranged so that the inward protruding end of the brick retainer 5 is inserted into the recess or L portion 8 of the brick 1, and then the castable refractory 3 is inserted. construction to the specified position. In FIG. 1, reference numeral 6 designates a Y-shaped stud for the castable refractory 3 provided on the brick clamp 5 and its rib 9.

The cross section used in the structure of this invention is U-shaped or L-shaped.
By fixing the shaped brick 1 and the castable refractory 3 with the studs 2, the strain concentration of thermal stress and mechanical impact on the brick 1, which has a U-shaped or L-shaped cross section, is prevented during use of the ladle. This is to suppress the occurrence of cracks 7 and maintain the structure. Also,
By fixing the reinforcing iron plate 4 to the side surface of the brick 1, which has a U-shaped or L-shaped cross section, the occurrence of cracks can be further suppressed.

Effects of the idea When exposed to the inside of a furnace in conventional castable construction, the initial corrosion rate was 30mm/charge, and then the rate increased to 20mm/charge with slag and base metal attached, causing cracks and peeling to occur. There is no product that is worth the cost because of the charge life.

In addition, in the case of the jack arch structure, the structure loosened after 5 to 10 charges, but although there was no individual damage to the bricks, they fell off during the first (20 to 30 charges) drop and had to be reloaded.

Before adopting this improved brick, we conducted a test in an actual furnace with anchors, and found that only 8 cracks 7 developed out of the 11 bricks used per pot, but none of them fell off. Furthermore, the combined use of iron plate attachment combined with the synergistic effect of preventing cracks resulted in a lifespan of 1.5 to 1.7 times longer than conventional methods.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the ladle slag removal port of the present invention, Fig. 2 is a perspective view thereof, and Figs. 3 and 4 are perspective views of U-shaped and L-shaped bricks in cross section used in the structure of the present invention.
Figure 5 is a schematic diagram of a conventional jack arch structure; in the figure: 1: U-shaped or L-shaped bricks;
2: Y-shaped stud, 3: Castable refractory,
4: Reinforcing iron plate, 5: Brick presser, 6: Y-shaped stud, 7: Crack, 8: Recess or L portion, 9: Rib, 10: Pressing brick.

Claims (1)

[Claims for Utility Model Registration] (1) A recess in a U-shaped brick 1 or an L-shaped brick in which at least one stud 2 is implanted on the innermost upper end surface of a ladle removal opening. A refractory structure for a ladle slag removal port, characterized in that the L portion is arranged so as to surround the inner end of a brick presser foot 5, and a castable refractory 3 is installed up to a predetermined position. (2) The above-mentioned U-shaped cross-section brick or L-shaped brick 1
A refractory structure for a ladle slag removal opening as set forth in claim 1 of the utility model registration claim, in which a reinforcing iron plate 4 is disposed and fixed on the side surface of the ladle.