JPH08294755A - Four ladle mounting type ladle changing device - Google Patents

Abstract

PURPOSE: To prevent the development of a defective cast slab at the time of changing a ladle by arranging two ladle mounting parts for supplying molten metal to each strand at a molten metal pouring side of a turret and arranging the same ladle mounting part in a ladle receiving side positioned by turning the turret by 180 deg.. CONSTITUTION: On the ladle mounting parts 7-1, 7-2, the ladles 6-1, 6-2 storing the molten metal are mounted, respectively and the molten metal is supplied to the molds 4, 5 by pouring the molten metal in the ladles 6-1, 6-2 into tundishes 12-1, 12-2, respectively. The pourings of the molten metal in the ladles 6-1, 6-2 are simultaneously started and completed. Two ladles 11-1 and 11-2 storing molten metal to be poured next are mounted in the ladle mounting parts 8-1, 8-2 during pouring, and at the time of completing the pouring of the molten metal in the ladles 6-1, 6-2, the turret is turned by 180 deg. and the ladles 11-1 and 11-2 are shifted to the molten metal pouring side. The empty ladles 6-1, 6-2 are changed for the other ladles storing the molten metal. By this constitution, the development of the defective cast slab at the time of changing is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladle exchanging device used for exchanging a preceding ladle and a latter ladle in a multi-strand continuous casting machine.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of a turret 1 of an ordinary ladle changing device used in a multi-strand continuous casting machine having a plurality of molds 4 and 5, (A) being a plan view and (B).
[Fig. 3] is a front explanatory view of a state of use. That is, on the pouring side 2 of the turret 1 which horizontally swivels in the direction of the arrow 9 around the center column 10, a ladle mounting portion for mounting the ladle 6 into which the molten metal is simultaneously poured into the molds 4 and 5 is placed. 7 and 180 on the ladle receiving side of the turret 1 in the direction of arrow 9
A ladle placing portion 8 for placing the ladle 11 after being rotated and simultaneously pouring the molten metal into the molds 4 and 5 is provided.

An operation method of continuous casting using the apparatus shown in FIG. 2 will be described. In the first method, first the ladle 6 on the pouring side 2
The molten metal of is poured into the molds 4 and 5 simultaneously. During this pouring, the later ladle 11 is placed on the ladle placing portion 8 provided on the ladle receiving side 3. When the pouring of the ladle 6 is completed, the turret 1 is swung to move the ladle 11 to the pouring side 2, and the molten metal in the ladle 11 is further poured into the molds 4 and 5 at the same time. The ladle 6 which has been emptied by the turning of the turret is moved to the ladle receiving side 3, but it is replaced with another ladle (not shown) containing the molten metal.

When the turret 1 is swung n times using ladles 6 and 11 containing M tons of molten metal (n in the text
Indicates the number of times of rotation for replacing the ladle during continuous casting. ),
M (n + 1) ton of molten metal is injected. In this way, the last molten metal of the ladle 6 and the first molten metal of the latter ladle 11 form a slab that serves as a connecting portion when the ladle is replaced. However, the slab serving as the connecting portion is a second-grade product because it is insufficient for producing a high-quality product. When the turret 1 is rotated n times, slabs are produced from each of the molds 4 and 5 which are addressed to n pieces, that is, a total of 2n connecting pieces in the example of FIG. Therefore, the generation rate of the second-class products of this first method is {(2n
Book) / M (n + 1) tons}, but this occurrence rate is higher than the second method described later.

In the second method, a tundish having no nozzle 17 in FIG. 2 is used to inject the molten metal only into the mold 4. When the turret 1 is swung n times by the second method, M (n + 1) ton of molten metal is injected. All of this molten metal becomes one cast piece 14, but in the cast piece 14 in the meantime, cast pieces (second grade products) which become n connecting parts are generated. Therefore, the generation rate of the second-class products of the second method is {(n pieces) / M (n + 1) tons}.
Which is preferable because it is reduced to half compared with the first method.

The supply rate (ton / min) of the molten metal to the mold 4 influences the quality of the slab 14. Therefore, the molten metal supply rate to the mold 4 in the first method and the mold 4 in the second method
The feed rates of the molten metal to are almost equal.

On the other hand, the second method does not use the mold 5. Therefore, in the second method, it is necessary to reduce the feed rate of the molten metal from the ladle, and the time required to cast M tons of molten metal is approximately doubled as compared with the first method. There is a problem that the casting capacity of the continuous casting machine is reduced to half compared to

[0008]

As described above, the first
The method (1) is preferable because the casting capacity of the continuous casting machine is larger than that of the second method, but there is a problem that the generation rate of the second grade product is high, and the second method has a low generation rate of the second grade product. However, there is a problem that the casting ability of the continuous casting machine becomes smaller than that of the first method. The present invention solves these problems, that is, the casting capacity of the continuous casting machine is sufficiently large as in the first method, and the amount of secondary products is sufficiently reduced as in the second method. The challenge is to provide the means by which things can be done.

[0009]

FIG. 1 is an explanatory view of an example of the present invention, FIG. 1 (A) is a plan explanatory view of a 4-pot loading type ladle changing device of the present invention, and FIG. 1 (B) is the same. It is a front explanatory view of the state of use. INDUSTRIAL APPLICABILITY The present invention relates to a ladle changing device used in a continuous casting machine for a plurality of strands having a plurality of molds 4 and 5, in which a pouring side 2 of a turret 1 horizontally swiveling around a central support column 10 as an arrow, The ladle placing section 7-1 for placing the one ladle 6-1 to which the molten metal is supplied to a part of the molds 4 of the multiple strands, and the destination where the molten metal is supplied to the remaining molds 5 of the multiple strands Two ladle placing parts, namely, a ladle placing part 7-2 for placing another ladle 6-2 are provided.

On the ladle receiving side 3 of the turret 1,
The turret 1 is rotated 180 ° in the direction of the arrow 9 to supply the molten metal to the part of the molds 4 having a plurality of strands, and a ladle placing portion 8-1 for one ladle (not shown) and a plurality of strands are provided. It is characterized in that there are provided two ladle placing portions, namely, a ladle placing portion 8-2 for another ladle (not shown) after supplying the molten metal to the remaining mold 5.

[0011]

A new method of continuous casting operation by the present inventors will be described with reference to FIG. The first ladle 6-1 containing the molten metal is placed on the ladle placing section 7-1, and the other ladle 6-2 containing the molten metal is placed on the ladle placing section 7-2. ing. Ladle 6-
The molten metal No. 1 is exclusively supplied to the mold 4 by injecting it into the tundish 12-1. The molten metal in the ladle 6-2 is exclusively supplied to the mold 5 by injecting it into the tundish 12-2. The molten metal injection in the ladle 6-1 and the molten metal injection in the ladle 6-2 start in parallel at substantially the same time and end at substantially the same time.

During this pouring, one ladle 11-1 (not shown) after containing the molten metal to be poured next is placed on the ladle placing portion 8-1 and the ladle placing portion 8-1 is placed. -2, another ladle 11-2 (not shown) after containing the molten metal to be injected next is placed.

After the pouring of the ladles 6-1 and 6-2 is completed, the turret 1 is rotated 180 ° and the ladle on the ladle receiving side 11-
Move 1 and 11-2 to the pouring side. Then ladle 11-
The molten metal of No. 1 is exclusively supplied to the mold 4 by pouring it into the tundish 12-1, and the molten metal of the ladle 11-2 is exclusively supplied to the mold 5 by being injected into the tundish 12-2. The pouring of the molten metal in the ladle 11-1 and the pouring of the molten metal in the ladle 11-2 are started in parallel and at substantially the same time.

By the turning of the turret 1, the empty ladles 6-1 and 6-2 are moved to the ladle receiving side 3, but another ladle containing molten metal (shown in the figure). Not).

When the turret 1 is swung n times by the method shown in FIG. 1, 2M (n + 1) ton of molten metal is injected. During this injection, a total of 2n second grade products are generated from the mold 4 and the mold 5 with the number of n addressed to n. Therefore, the generation rate of the second-class products is {(2n) / 2M (n + 1) tons}, that is, {(n)
/ M (n + 1) ton}, which is half that of the first method and becomes the same as the second method.

In the method of FIG. 1, the molten metal is supplied from the ladle 6-1 at a speed lower than that in the first method, but the speed at which the mold 4 receives the molten metal is the same as that in the first method. is there. At the same time, the receiving speed of the molten metal in the mold 5 is the same as in the case of the first method. Therefore, the casting capacity of the continuous casting machine is doubled as compared with the second method and becomes the same as that of the first method.

In the present invention, the respective molten metal supply rates are adjusted so that the ladle 6-1 and the ladle 6-2 end the pouring at substantially the same time. This adjustment is performed by a conventional tundish for adjusting the flow rate. Since the nozzle 16 and the ladle nozzle 18 can be used, and the mold 4 and the mold 5 can be driven independently for each strand, the supply rate of the molten metal can be easily adjusted.

[0018]

When the ladle changing device of the present invention is used, in continuous casting by a continuous casting machine for a plurality of strands, a slab of inferior quality generated at the time of changing the ladle can be produced without lowering the casting ability of the continuous casting machine. The amount generated can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of a ladle changing device of the present invention.

FIG. 2 is an explanatory view of a conventional ladle changing device.

[Explanation of symbols]

1: Turret, 2: Pouring side, 3: Ladle receiving side,
4: mold, 5: mold, 6 (6-1, 6-2): previous ladle, 7 (7-1, 7-2): ladle placement part, 8 (8-
1, 8-2): Ladle mounting part, 9: Turning direction of turret, 10: Central support, 11: Ladle, 12 (12-
1, 12-2): Tundish, 13: Traon of ladle, 14: Cast piece, 15: Cast piece, 16: Tundish nozzle, 17: Tundish nozzle, 18:
Ladle nozzle.

Claims (1)

[Claims] 1. A ladle changing device for use in a continuous casting machine for a plurality of strands, wherein a pouring side of a horizontally rotating turret is for one ladle to which molten metal is supplied to a part of molds of a plurality of strands. Two ladle mounting portions for the other ladle to which the molten metal is supplied to the remaining molds of the multiple strands are provided, and the turret is swung by 180 ° on the ladle receiving side of the turret. Two ladle mounting portions are provided for one ladle after supplying the molten metal to the part of the molds and for another ladle after supplying the molten metal to the remaining molds of a plurality of strands. 4 ladle loading type ladle changing device, characterized in that