JPH0117420Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an improvement in the construction structure of a ladle sludge removal opening. [Prior Art] Molten steel obtained by melting and refining in an electric furnace or the like is generally transferred to a ladle and subjected to desulfurization and deoxidation treatment. In this case, the excess slag on the surface of the molten steel is scraped out from the slag removal port before the molten steel is transferred to the ladle and subjected to desulfurization deoxidation treatment or composition adjustment.The general structure of the ladle sludge removal port is As shown in FIG. 3, a recessed portion 4 is provided at the upper opening edge of the main body 3, which is lined with refractory bricks 2 in a stacked manner on the inner surface of the iron skin furnace shell 1.
An abbreviated iron skin frame 5 is placed in the recessed part 4 so that a part thereof rests on the firebrick 2, and is welded to the furnace shell 1 by 6, and the inside of the iron skin frame 5 is It was constructed by mounting castables 7 on the bottom and constructing a sludge removal port 8. According to this structure, when the refractory brick 2 expands upward due to the heat of the molten steel in the ladle, the part 5a on which the steel frame 5 rests on the refractory brick 2 is pushed up, and the castable 7 above it is detached. Otherwise, the refractory bricks 2 could no longer be held down and fell off, or the joints between the refractory bricks 2 would open, allowing molten steel to enter there and quickly damage the outer shell of the ladle. [Purpose and structure of the invention] The present invention aims to extend the life of the ladle, and consists of the uppermost lining brick of the main body facing the slag removal port and the flooring brick of the slag removal port. The lining bricks and flooring bricks are made to face each other with upwardly inclined abutting surfaces facing inward, and castable is poured into the gap between the abutting surfaces to join the lining bricks and flooring bricks. It is characterized by passing through burls that are pivoted to both side frame parts. [Function] Even if the lining bricks of the main body expand due to the heat of the molten steel, the expansion force is dispersed at the abutting surfaces of the lining bricks and flooring bricks, and the force pushing up the flooring bricks is reduced. Further, since the flooring bricks are pivotally attached to the frame portions on both sides of the slag removal port, they are not peeled off by the pushing up force of the lining bricks, and have the effect of holding down the lining bricks as a reaction force against the pushing up force. [Example] Fig. 1 shows an example of the slag removal opening construction structure of the present invention. In the figure, the same components as those in the conventional example of FIG. In addition, the slag removal port 8'
In this case, a flooring brick 9 made of firebrick is laid in place of the castable 7 in the steel frame 5, and one corner side of each of the flooring brick 9 and the lining brick 2' is inclined at an angle of 45°. Cut them out, make them face each other with upwardly inclined abutting surfaces facing inward of the main body 3, and pour the castable 10 into the gap between the abutting surfaces to close the gap with the castable 10 and join them. . Then, a crowbar 11 is inserted into the flooring brick 9 and the crowbar 11 is inserted into the flooring brick 9.
are pivoted to the frame portions 5b, 5b on both sides of the steel frame 5'. However, according to the ladle slag removal port constructed in this way, the lining brick 2' is removed by the heat of the molten steel in the ladle.
expands and the expansion force acts to push up the flooring bricks 9 at the slag removal port 8', but that force is dispersed at the abutting surface between the lining bricks 2' and the flooring bricks 9, and the flooring bricks 9 The force pushing up is reduced. Also, since the flooring bricks 9 are pivoted to both side frame portions 5b, 5b of the steel frame 5', the lining bricks 9 are
The lining bricks 2' are not peeled off by the pushing up force, and on the contrary, the lining bricks 2'
The force that holds it down works. Therefore, even when the lining bricks 2' expand and contract repeatedly, it is difficult for the flooring bricks 9 of the slag removal port 8' to come off, for the lining bricks 2' of the main body 3 to fall off, or for molten steel to enter the joints. . The following table compares the service life of the structure of the present invention (Figure 1) and the conventional structure (Figure 3). In the table, all materials other than castable are made of refractory bricks, and in terms of material composition, "Carbon" refers to 90-100% carbon, and "MgO-Carbon" refers to
Compounds of MgO 70-90% and carbon 10-30%,
"Hyal" is used as an abbreviation for high alumina.

[Table] As is clear from the table, the inventive structure has a significantly longer service life than the conventional structure.Comparing the same materials, the inventive structure is 350/140 times longer than the conventional structure.
= 2.5 times longer service life. The service life can be further extended by changing the materials, and in the case of the structure A of the present invention in which the lining bricks 2' are made of MgO-Carbon and the flooring bricks 9 are made of Carbon, 6
50/140=approximately 4.6 times longer service life. [Effects of the invention] Even if the lining bricks of the main body expand, the effect on the lining bricks at the slag removal port is alleviated, and at the same time, the flooring bricks have the effect of holding down the lining bricks, and the lining bricks themselves are able to absorb their own expansion and contraction. To withstand repeated use and extend the life of the ladle. Since the flooring bricks are fixed to the frames on both sides of the slag removal port by inserting a crowbar through them, even if they are repeatedly pushed up from the lining bricks, they will not come off, which is beneficial and will significantly extend the life of the slag removal port. It is something.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Figure 1 is a vertical cross-sectional view of the main parts, Figure 2 is an overall external view partially cut away, and Figure 3 is a vertical cross-sectional view of the conventional structure. It is. 2, 2'...Lining brick, 3...Main body, 5'...
...Iron skin frame, 5b, 5b...Side frame part, 8'...Slag removal port, 9...Flooring brick, 11...Crowbar.

Claims (1)

[Scope of utility model registration request] Among the lining bricks of the main body, the uppermost lining brick facing the slag removal port and the flooring brick of the slag removal port are arranged to face each other with a butting surface that slopes upward toward the inside of the main body, and a gap is formed between the butt surfaces. A ladle sludge removal opening characterized in that the lining brick and flooring brick are joined by pouring castable into the lining brick, and a crowbar fixed to both sides of the slag removal opening is inserted through the flooring brick. Built structure.