JP2933836B2 - Corner structure of molten metal container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corner structure of a molten metal container, such as a tundish or a pot, protruding from the inner surface of the molten metal container.

[0002]

2. Description of the Related Art In a continuous casting facility, a molten metal is poured from a ladle into a tundish, and the molten metal flows out from the tundish through a nozzle to continuously produce a steel slab.

The above-mentioned tundish has a horizontally long rectangular shape as shown in a plan view in FIG.
And has a contact portion 3 protruding outward in a substantially square shape as viewed from a plane on one side, and molten metal is injected into the contact portion 3.

[0004] In the tundish having the above structure,
There is a portion where the inner surface of the hot water contact portion 3 intersects with the inner surface of the tundish (hereinafter, this portion is referred to as a corner portion 4), and since the corner portion 4 has a form protruding inward, the corner portion is formed. The refractory block 5 (hereinafter referred to as a corner block) constituting 4 is pushed inward of the tundish due to the thermal expansion of the lining refractory, and damage such as overhang and collapse easily occurs.

Conventionally, as shown in FIG. 8, a ring-shaped hooking metal fitting 6 is welded to the inner surface of the corner portion of the steel shell 1 and is embedded in a corner block 5 constituting the corner portion 4. 9 to prevent the corner block 5 from protruding or collapsing, or as shown in FIG.
And castable 9 is cast to incorporate the anchor hardware 8 so as to form the corner portion 4. Further, as shown in FIG. 10, the corner block is a precast block 5A. 5A
A structure is mainly used in which an iron plate 10 and a steel shell 1 at the back are fastened with bolts 11 and an irregular refractory 12 is filled between them.

[0006]

However, the use of the mounting hardware such as the hooking metal fitting 6, the locking metal fitting 7, and the anchor metal fitting 8 in the level of the molten metal requires the use of the metal fitting and the castable metal. Due to the difference in the coefficient of thermal expansion, these refractories are easily cracked, and the molten metal may enter through gaps between the cracks and leak through the metal fittings.

In the case of the tension structure formed by the hook 6 and the latch 7, it is difficult to make the hook 6 on the steel bar 1 and the corner block 5 in close contact with each other. Therefore, the corner block 5 is extruded by the thermal expansion force of the refractory 2, the gap between the refractory 2 on the side wall and the corner block 5 expands at the time of cooling, and there is a problem that the metal easily enters at the time of hot reuse. there were.

In view of the above, the present invention provides a molten metal container which can prevent the corner block from projecting without using a metal fitting or an anchor in the molten metal level and can improve the structural stability of the corner portion. It is intended to provide a corner structure.

[0009]

As a means for solving the problems of the prior art, the present invention relates to a refractory block for corners which is laminated on a corner part protruding from the inner surface of a molten metal container such as a tundish. The refractory block forming the corner has a concave portion formed on one surface of the refractory block, the central portion of which is wide and narrows toward the front and rear ends, and the opposite surface can be fitted with the concave portion. A feature is that a convex portion having the same shape is formed, the concave portion and the convex portion are fitted to each other, and a refractory block is laminated to form a corner portion. Further, a refractory block higher than the molten metal level of the refractory blocks laminated to form the corner portion is fixed to a steel shell of the molten metal container by a mounting bracket.
It is assumed that.

[0010]

With the above arrangement, the upper and lower corner blocks are connected to each other by fitting the concave and convex portions formed on the upper and lower surfaces thereof, and the concave and convex portions are wide at the center in the front-rear direction of the corner block. As a result, the protrusions of the corner blocks to the inside of the molten metal container are mutually restrained, thereby preventing overhang. Also, as in claim 2,
If the corner block higher than the molten metal level is fixed to the steel shell with a locking metal, the corner block can be further extended without the need to provide metal fittings for fixing the corner block to the steel metal within the molten metal level. Can be prevented. In any case, by burying the lower end of the corner block in the floor, the stability of the corner portion can be increased.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The members common to FIGS. 7 to 10 are described using the same reference numerals.

The corner block 13 used in the present invention is, as shown in FIG. 1, an example of a plane, and as shown in FIG. 2 as a front view, abutted against the end of the refractory 2 constituting the inner surface of the tundish 2. Two abutting surfaces 13a, 13a and two inner surfaces 1 forming an extended surface of the inner surface of the refractory 2.
3b, 13b, a steel facing surface 13c facing the flat surface 1a of the corner portion of the steel shell 1, and a tip end surface 13d having a reduced corner portion have a flat and substantially hexagonal shape. 13b, 13b and the front end surface 13d are tapered surfaces that are slightly upwardly tapered, and when laminated on the corner portion 4, constitute an inclined surface as a whole as shown in FIGS.

A recess 14 is formed on one surface of the corner block 13 from the iron-sheet facing surface 13c, which is the rear end of the corner block 13, to the front end surface 13d, which is the front end thereof. The convex part 15 of the same shape which can fit as closely as possible is formed.

In the embodiment shown in FIG. 1, the shape of the concave portion 14 and the convex portion 15 is a substantially rhombic shape in which the position slightly closer to the steel-sheet facing surface 13c from the center is the widest and gradually narrows toward the front and rear ends. The periphery thereof is slightly tapered so that it can be easily fitted.

The shape of the concave portion 14 and the convex portion 15 is not limited to a rhombus as long as the central portion is wide, and is substantially elliptical as shown in FIG. 3 (A) or shown in FIG. 3 (B). The shape may be a circle, a closed rhombus, a polygon, or the like as shown in FIG.

The corner block 1 formed as described above
3 and 3 are sequentially fitted to each other, and the lower end is buried in the floor 16 as shown in FIGS. The concave portion 14 and the convex portion 15 are connected by fitting. Particularly, since the concave portion 14 and the convex portion 15 are formed so as to have a wide central portion in the front-rear direction, the corner block 13 is prevented from moving inward of the molten metal container. The corner blocks 13 are restrained from each other and are prevented from projecting inward.

In order to more reliably prevent the inward movement of the corner block 13, the corner block 13 'located above the level L of the molten metal is replaced with the conventional hooking metal fitting 6, locking metal fitting 7 and the like. It can be fixed to the steel shell 1 by using a mounting bracket. According to this, since the metal fittings 6 and 7 are located above the molten metal level L, the metal fittings 6 and 7 are not damaged by the infiltration of the molten metal, but the overhang of the lower corner blocks 13, 13. However, the structural stability of the corner portion 4 can be increased as a whole, and the reliability can be increased.

In the illustrated embodiment, the case of a tundish has been described. However, it goes without saying that the present invention can also be applied to a corner portion at the inner end of a pouring port of a pot.

[0019]

As described above, according to the present invention, the protrusions and the recesses formed on the upper and lower surfaces of the corner block forming the corner protruding from the inner surface of the molten metal container are engaged with each other. Are combined, and the convex and concave portions are wide at the center in the front-rear direction of the corner block,
The corner block does not protrude inward. Further, since it is not necessary to provide metals for fixing the corner block to the steel shell in the molten metal level, it is possible to prevent the occurrence of steel leakage accompanying the metal.

If the corner block higher than the level of the molten metal is fixed to the steel shell of the molten metal container via a mounting bracket as described in claim 2, the structural stability of the corner portion can be further enhanced.
The reliability can be further improved, and the mounting bracket is higher than the molten metal level, so it is not directly affected by the molten metal and there is no fear of steel leakage due to the presence of the mounting bracket .

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a refractory block (corner block) used in the present invention.

FIG. 2 is a front view of the same.

FIGS. 3A and 3B are plan views showing modified examples.

FIG. 4 is a plan view showing another modified example of the embodiment.

FIG. 5 is a plan view showing an example of a corner structure according to the present invention.

FIG. 6 is a sectional view of the same.

FIG. 7 is a plan view showing a tundish as an example of a molten metal container to which the present invention is applied.

FIG. 8 is a cross-sectional view of an example of a conventional corner portion structure.

FIG. 9 is a sectional view showing another example.

FIG. 10 is a sectional view showing still another example of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron skin 3 Hot water contact part 4 Corner part 5,13,13 'Corner block (refractory block) 6 Hook metal fitting 7 Lock metal fitting 8 Anchor metal hardware 14 Concave part 15 Convex part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B22D 41/02 B22D 11/10 310 F27D 1/00

Claims (2)

(57) [Claims] 1. A refractory block for a corner laminated on a corner portion protruding from an inner side surface of a molten metal container such as a tundish, wherein one surface of the refractory block constituting the corner has a wide center and front and rear ends. And a concave portion having the same shape as the concave portion is formed on the opposite surface, and the concave portion and the convex portion are fitted to each other to form a refractory. A corner portion structure of a molten metal container, wherein a corner portion is formed by stacking blocks. 2. The molten metal according to claim 1, wherein a refractory block higher than the molten metal level of the refractory blocks laminated to form the corner portion is fixed to a steel shell of the molten metal container by a mounting bracket. Corner structure of metal container.