KR100862820B1 - A slag dart - Google Patents

Abstract

The slag dart is provided to prevent slag from entering the ladle by closing the converter outlet at the end of the molten steel tapping operation.

The slag dart (1), a plurality of slots 12 are formed in the dart head 10 to close the converter outlet 102; And a rod member having a first steel rod 32 protruding from the upper surface of the dart head 10, and a second steel rod 34 detachably assembled to the lower surface of the dart head 10. 30); And, the sleeve 50 is integrally wrapped on the outside of the second steel rod (34); And a center of gravity means (70) inserted into and fixed to the outer circumferential surface of the dart head (10) to maintain the center of gravity of the dart, wherein the center of gravity means (70) is in close contact with the outer circumferential surface of the dart head (10). Supported head contact groove 72 is composed of a disc integrally formed in the center is configured to facilitate the slag horizontal maintenance of the dart head (10).

Therefore, according to the present invention, it is equipped with a center of gravity means to easily close the converter outlet in response to the vortex phenomenon of the molten steel near the converter outlet, while maintaining the assembly and life of the slag dart Provides an excellent effect of improving.

Converter, converter outlet, molten steel, ladle, slag, slag dart

Description

Slag Darts {A SLAG DART}

1 is a schematic diagram showing a state of use of a common slag dart

Figure 2 is a state diagram showing the vortex phenomenon of the molten steel during the conversion of the converter

3 shows a state of use of the conventional slag dart,

(a) is a schematic diagram

(b) is the main state diagram

4 is an assembled state diagram showing a conventional slag dart

Figure 5 is a schematic perspective view showing a slag dart excellent in assembly and tap closure according to the present invention

Figure 6 is a schematic diagram showing a state of use of the present inventors slag dart

Figure 7 is an exploded state diagram showing the slag dart of the present invention

8 is a structural diagram showing a slag dart of the present invention

9 shows the center of gravity means of the present inventors slag dart,

(a) a plan view

(b) front view

10 is a schematic diagram showing a state in which the present invention slag dart corresponding to the molten steel vortex phenomenon

Explanation of symbols on the main parts of the drawings

1 .... slag darts 10 .... darts head

30 .... rod member 32 .... first steel rod

34 .... Second Steel Rod 50 .... Sleeve

70 .... Center of gravity 72 .... Head contact groove

74 .... slag passing hole

100 .... Converter 102 .... Converter Exit

110 ... Ladle M ... molten steel

S .... slag V .... molten steel vortex

The present invention relates to a slag dart for closing the converter outlet at the time when the tapping operation of the molten steel is finished during the tapping operation of the converter to prevent the slag in the molten steel is mixed into the ladle, in particular, having a center of gravity means The present invention relates to a slag dart capable of easily closing the converter outlet in response to the vortex phenomenon of molten steel near the sphere, and improving the assemblability and life of the slag dart.

Generally, the molten iron produced in the blast furnace is transferred to the converter to perform refining operations such as oxygen scavenging and other alloying treatments, and then the iron source such as scrap iron is transferred to the arc heat in the electric furnace. In the electric furnace company which melts the furnace by refining and alloying and then taps the molten steel into the ladle, as shown in FIG. 1, in the refining process during the operation of tapping the molten steel M from the converter 100 into the ladle 110. It is necessary to separate the slag (S) generated from the molten steel due to the difference in specific gravity on the upper surface of the molten steel (M).

That is, as shown in Figures 1 and 2, when the internal molten steel (M) to the ladle 110 during the tilting operation of the converter through the converter outlet 102, the molten steel generated during the refining operation of the molten steel The less specific slag (S) should not be incorporated into the ladle 110, because the slag changes the composition of the molten steel after the refining process, after all, the success of effective tapping is the amount of slag incorporated into the ladle Depends on how much can be minimized.

On the other hand, since the specific gravity of the slag (S) is 2.2-2.8, which is considerably lower than the specific gravity of the molten steel, the slag floats on the molten steel. Since the slag (S) is discharged through the converter outlet later, it is common to use a slag dart that closes the converter outlet at the point of completion of the tapping of the molten steel to block the ladle mixing of the slag (S).

4 illustrates a conventional slag dart 120 as described above. The conventional slag dart 120 is an assembled slag dart as disclosed in Korean Patent Laid-Open No. 2000-55654.

That is, the conventional slag dart 120 has a plurality of slots 122a which are integrally extended in the vertical direction on the outer circumferential surface thereof, and a funnel-shaped dart head 122 manufactured to be filled with refractory, and the dart head ( A sleeve 124 in which a plurality of units 126 having protrusions 126a and recesses 126b fitted to each other are inserted to be inserted into the exit 102 of the converter 100 at a lower portion of the converter 100, and Passing the sleeve 124 and the dart head 122 integrally, the washer 128 is welded to the upper, lower side and the lower end of the sleeve of the dart head 122 to integrate the dart head 122 and the sleeve 124 in the vertical direction. It is comprised as the steel rod 130 fixed with the.

At this time, in the conventional slag dart 120 as described above, the sleeve 124 assembled with the refractory units 126 is inserted into the tap hole 102 of the converter 100 during the molten steel tapping operation of the converter. As shown in FIG. 2, the dart head 122 of the slag dart 120 deviates from the tap hole 102 by a vortex phenomenon that occurs near the converter tap hole during the tapping of the converter. Serves to prevent this from happening.

However, such a conventional slag dart 120 is, as shown in Figures 3 and 4, after the plurality of sleeve units 126 are injection molded into a pipe (tube) shape, the steel rod 130 and the washer ( 128), considering that the melting point of the steel rod exposed portion, that is, the upper side of the dart head 122 and the lower end of the sleeve and the washer 128 is 1250 ° C, the molten steel to block the ladle mixing of the slag When the molten steel is injected into the molten steel, the molten steel temperature is about 1750 ° C., so that the steel rod 130 and the sleeve 124 are fixed to the dart head 122 while the molten steel is separated. The lower sleeve units 126 of the dart head 122 are also easily separated from the dart head 122 by the vortex or the back pressure generated when the molten steel is pulled out as shown in FIG. Dart Head (122) It can not not turned over As completely close the converter tapping opening (102) by a vortex of molten steel to the slag is entrained into the ladle.

In addition, as shown in Figure 3b, when looking at the state of tapping due to the vortex (V) generated during the molten steel, the conventional slag dart 120 is a dart when the molten steel is large, the height of the remaining molten steel and slag darts The length of the sleeve is almost the same so that the slag dart 120 falls by the vortex (V) is not completely inserted into the tap hole, as shown in Figure 3a and the above, the steel rod 130 and washer 128 ) Melts and the sleeve units 126 are disengaged so that the center of gravity of the sleeve 124 does not fit and the sleeve 124 is not inserted into the converter outlet 102, resulting in the converter by the dart head 122. It is difficult to close the exit.

And, as shown in Figure 4, by applying a mortar to the protrusion 126a and the groove 126b integrally formed on the upper and lower portions of the unit 126 of the sleeve 124, the loss is easily generated at such an adhesive site It is.

Therefore, the conventional slag dart 120, as shown in Figures 1 to 4, does not effectively block the ladle mixing of the slag during the molten steel of the converter, while reducing the quality of the molten steel while changing the composition of the molten steel, In the assembly thereof, fixing of the steel rod 130, the sleeve unit 126, and the washers 128 is cumbersome, and in particular, applying mortar to the protrusions 126a and the grooves 126b between the sleeve units 126 to adhere them. Therefore, workability is also inferior at the time of assembly.

The present invention has been made in order to improve the various problems as described above, the object of which is to provide a center of gravity means to easily close the converter outlet in response to the vortex phenomenon of the molten steel near the converter outlet, In order to improve the assembly and life of the slag dart, it is to provide a slag dart.

As a technical configuration for achieving the above object, the present invention, in the slag dart for closing the converter entrance to prevent ladle mixing of the slag during the molten steel of the converter, a plurality of slots are formed to close the converter outlet Dart head to make;

A rod member having a first steel rod protruding from an upper surface of the dart head and a second steel rod detachably assembled to a lower surface of the dart head; Wow,

A sleeve that is integrally wrapped on the outside of the second steel rod and inserted into the converter outlet; And,

It is composed of; the center of gravity means for maintaining the center of gravity of the dart is fixed to the outer peripheral surface of the dart head,
The center of gravity means is provided with a slag dart configured to facilitate the slag horizontal maintenance of the dart head is composed of a disc formed integrally in the center of the head contact groove that is in close contact with the outer peripheral surface of the dart head.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 is a schematic perspective view showing the slag dart excellent in the assembly and tapping blockability according to the present invention, Figure 6 is a schematic diagram showing the use state of the slag dart, Figure 7 is an exploded state diagram showing the slag dart 8 is a structural diagram showing a slag dart, FIG. 9 is a view showing a center of gravity of the slag dart, and FIG. 10 is a schematic diagram showing a state in which the slag dart corresponds to the molten steel vortex phenomenon.

In FIG. 5, the slag dart 1 of the present inventors has excellent assembly ability and tap closure property. The slag dart 1 of the present invention has a dart head 10, a rod member 30, and a sleeve ( 50), and may be divided into the center of gravity means 70, the various components 10, 30, 50, 70 as described in more detail as follows.

First, FIGS. 5, 7 and 8 illustrate the dart head 10 of the slag dart 1 of the present invention. The slag dart head 10 of the present invention is formed in a funnel shape and refractory is integrally formed. In this case, a total of four slots 12 are formed on the circumferential surface of the dart head 10 at approximately 90 ° intervals.

That is, as shown in FIG. 6, the slot 12 is immersed in the slag S by the weight of the dart head 10 when the dart head 10 is injected into the slag S on the molten steel. In addition, the slag flows along the slot 12 and prevents the dart head 10 from being turned over on the slag.

Next, FIGS. 5, 7 and 8 show the rod member 30 of the slag dart 1 according to the present invention. The rod member 30 of the present invention has an upper portion of the dart head 10. It is divided into a first steel rod 32 protruding from the surface and a second steel rod 34 detachably assembled to the lower surface of the dart head 10.

That is, as shown in FIGS. 7 and 8, the first steel rod 32 of the rod member 30 is integrally connected to the inside of the dart head 10 during the refractory molding of the dart head 10. It is formed in a fixed inverted T shape and when the slag dart 1 is introduced into the converter, it serves as a fastening rod that is fastened to a dart feeder not shown in the drawing.

As shown in FIGS. 7 and 8, the second steel rod 34 of the rod member 30 has a screw part 14 formed integrally with the lower inner side during the refractory molding of the dart head 10. The second steel rod 34 is detachably connected to the dart head 10, which is a refractory material, by having a screw part 34a that is integrally processed at an upper end portion thereof so as to be fastened thereto.

That is, since the second steel rod 34 of the present invention can be simply assembled in the lower part of the dart head 10 after the sleeve 50 described below is integrally mounted on the outer circumferential surface, Compared to assembling the conventional slag dart 120 with a washer or the like as in FIG. 4, the assembly and disassembly work is facilitated, which is transferred to the dart feeder (not shown) before the movement and storage of the slag dart 1 or the converter. Even when it is attached, it is to be able to handle easily.

Next, FIGS. 5, 7 and 8 show the sleeve 50 of the slag dart 1 of the present invention. The sleeve 50 of the present invention is integrally different from the conventional sleeve 124 of FIG. Is formed.

That is, as shown in Figures 7 and 8, the sleeve 50 is integrally wrapped on the outside of the second steel rod 34, this sleeve 50 of the present invention is the rod member 30 In the manufacturing of the second steel rod (34)) is formed of a refractory molded in a solid integrally to the sleeve fastening piece (34b) integrally installed in the longitudinal direction on the outer side.

As a result, since the sleeve 50 is firmly fixed to the fastening piece 34b of the second steel rod 34, the outer circumferential surface of the second steel rod 34 is closely wrapped, so that the conventional steel rod portion is formed in molten steel. The problem of melting is completely solved, and when the slag dart 1 is thrown onto the slag due to the rod detachment of the sleeve 50, it is prevented from falling down effectively to close the converter outlet 102.

That is, since the sleeve 50 of the present invention is stably maintained even if it is introduced into molten steel by an initial length, the sleeve 50 is always uniformly inserted into the converter outlet 102 so that the slag dart 1 is always smooth. It is to close the converter door 102.

Next, FIGS. 5, 7 and 9 illustrate the center of gravity means 70 of the slag dart 1 of the present invention. The center of gravity means 70 of the present invention includes the dart head 10. It is fitted to the outer circumferential surface of and is configured to maintain the center of gravity of the dart.

That is, as shown in Figures 5 and 7, the center of gravity means 70 is composed of a disc formed integrally in the center of the head contact groove 72 is supported in close contact with the outer peripheral surface of the dart head 10 When the lower portion of the dart head 10 having an inclined outer circumferential surface into the funnel shape is inserted into the head close groove 72, the head close groove 72 is forcibly fitted to the outer circumferential surface of the dart head 10. do.

At this time, as shown in Figure 6, when the actual slag dart (1) is put into the converter, the center of gravity means 70 consisting of a disc slag while the sleeve 50 is inserted into the converter outlet 102 by its own weight Since it is floating on (S), since the center of gravity means 70 consisting of a disc is gradually pushed up along the circumferential surface of the dart head 10, the center of gravity means 70 consisting of a disc is a dart head ( 10) does not break away.

In addition, the center of gravity means 70 composed of a disc serves as a wing of the dart head 10 does not turn over even if the dart head 10 is put into the converter, so that the sleeve 50 always faces downward, slag The overall center of gravity of the dart 1 is directed downward so that the slag dart 1 effectively closes the converter entrance.

At this time, as shown in Figure 8, the center of gravity means 70 composed of a disk, it is provided with a slag through hole 74 is arranged in a plurality of circumferential direction and formed in a screw shape in the opposite direction of the molten steel vortex, Such a width d of the slag passage hole 74 is preferably formed between 1/3-2/3 of the width D of the center of gravity means 70 composed of a disc.

That is, since the slag through-hole 74 is formed in the opposite direction of the molten steel vortex (V) as shown in Figure 10, when the slag dart (1) is put into the converter, the dart head 10 is Slag dart (1) by the center of gravity means (70) consisting of a disc while passing the slag (S) from the top of the center of gravity (70) consisting of a disc by the molten steel vortex (V) at the moment of being immersed on the slag The center of gravity of the, that is to facilitate the horizontal maintenance to avoid overturning.

However, the width d of the slag passage hole 74 as described above is between 1/3 and 2/3 based on the width D of the center of gravity means 70 composed of a disc, as shown in FIG. 8A. If it is out of the above range, that is, if the width of the center of gravity means 70 composed of the disc is less than 1/3, the vortex of molten steel generated by collision with the center of gravity means 70 composed of the disc If the phenomenon cannot be suppressed and, on the contrary, larger than 2/3, the slag passing amount is too large, so that the slag dart position adjusting effect by the center of gravity means 70 composed of the original plate is hardly obtained.

And, as shown in Figure 8, the center of gravity means 70 composed of the disk is further provided with a plurality of circular projections 76 formed integrally along the lower edge of the bottom, such as the center of gravity composed of such a disk The circular protrusions 76 of the means 70 are for smoothing the horizontal center of gravity means (70) consisting of the disc slag through the slag passing through the slag passage hole 74 formed on the disc smoothly in the slag .

Accordingly, as shown in FIG. 6, when the slag dart 1 of the present invention is put into the converter, the dart head 10 is stably on the slag without being turned over by the center of gravity means 70 composed of a disc. While floating, as shown in FIG. 10, even when the molten steel vortex (V) is generated at the time when the converter tapping of the molten steel (M) is completed, the dart head 10 effectively closes the converter tap hole 102 so that the slag To prevent ladle mixing.

In addition, since the second steel rod 34 in which the sleeve 50 is integrated is easily attached to or detached from the dart head 10, the assembly of the slag dart 1 and the installation of the dart feeder are very convenient. will be.

As described above, according to the slag dart of the present invention, it is possible to minimize the incorporation of slag into the molten steel of the ladle during the tapping of the converter, thereby improving the quality of the molten steel.

And, it is easy to assemble and separate to facilitate the molten steel input preparation work of the slag dart through the dart injector is convenient to use, and to facilitate the disassembly and assembly to provide an excellent effect to facilitate the movement and storage of the slag dart.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (6)

In the slag dart (1) for closing the converter entrance to prevent ladle mixing of the slag during the molten steel tapping of the converter, A plurality of slots 12 are formed to close the converter outlet 102, the dart head 10; And, A rod member 30 having a first steel rod 32 protruding from the upper surface of the dart head 10 and a second steel rod 34 detachably assembled to the lower surface of the dart head 10; Wow, A sleeve 50 that is integrally wrapped on the outside of the second steel rod 34 and inserted into the converter outlet; And, Consisting of the center of gravity means 70 is fitted to the outer peripheral surface of the dart head 10, fixed, The center of gravity means 70 is composed of a disk formed integrally in the center of the head contact groove 72 is in close contact with the outer peripheral surface of the dart head 10 is configured to facilitate the slag horizontal maintenance of the dart head 10 Slag dart featured The method of claim 1, wherein the first steel rod 32 of the rod member 30 is formed in an inverted T-shape fixed integrally connected to the interior of the dart head 10 during the refractory molding of the dart head 10 Made of a fastening rod fastened to the dart injector, The second steel rod 34 of the rod member 30, the screw portion 34a integrally processed to the upper end portion to be fastened to the screw portion 14 formed integrally with the lower inner side during the refractory molding of the dart head 10 Slag dart, characterized in that the second steel rod 34 is detachably connected to the dart head 10 that is refractory The method of claim 1, wherein the sleeve 50 is firmly integrated into the sleeve fastening piece (34b) is a plurality of integrally installed in the longitudinal direction on the outer surface when manufacturing the second steel rod 34 of the rod member (30) Slag dart, characterized in that formed from molded refractory delete The center of gravity means (70) consisting of the disk has a slag through hole (74) arranged in the circumferential direction thereof and formed in a screw shape in a direction opposite to the molten steel vortex, Slag dart characterized in that the width d of the slag passing hole 74 is formed by 1/3-2/3 of the width D of the center of gravity means 70 composed of a disc According to claim 1, wherein the center of gravity means (70) consisting of the disk is further provided with a plurality of circular projections 76 formed integrally along the lower edge of the slag passing through the slag passage hole 74, the contact Slag dart characterized in that the center of gravity means (70) consisting of a disk is configured to smoothly maintain the horizontal in the slag

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