JPH07260372A - Expansive plug for stopping taphole of container for metallurgy - Google Patents

Abstract

PURPOSE:To surely stop up a taphole for steel in whatever condition the operation is by making a spring impart its repelling power as an axial compressive force to the body of an expansive plug, which expands and softens under heat, so as to make it radially expand rapidly. CONSTITUTION:An expansive plug is inserted in the taphole for steel in a container for metallurgy and designed to prevent the slag from flowing out into a receiving container. In this instance from a material containing respectively a temperature-reactive component which expands under heat and a component which softens under heat a body of expansive plug which is composed of a core 1 of expansive material and a outer surface layer 2 is formed. Iron plates 3 are provided at the two ends of the body of expansive plug respectively and an iron bar 4 is passed therethrough with a spring 7 interposed between a stopper 5 on the iron bar 4 and one iron plate 3. The repelling power of the spring 7 exerts an axial compressive force on the body of expansive plug so that this body of expansive plug can be radially expanded with rapidity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansive plug for closing a tap of a metallurgical container for preventing slag from flowing into a receiving container by being inserted into the tap of a metallurgical container.

[0002]

2. Description of the Related Art An expansive plug for closing a tap hole of a metallurgical vessel will be outlined with reference to FIGS. As shown in FIG. 4, when the metal is melted, a slag S is formed on the surface thereof, and when the metallurgical container A is rotated in that state, the slag S flows out from the tap hole B into the receiving container (not shown). . On the other hand, as shown in FIG. 5, if the tap hole B of the metallurgical container A is closed with a plug P and the plug P is removed after rotation or disappeared, the molten metal surface on which the slag S floats. Is located above the tap hole B, and the slag S does not flow out into the receiving container. That is, the plug P is inserted into the tap hole B before the metallurgical container A is rotated in order to prevent the tip of the slag S from flowing out before the metal in the metallurgical container A is discharged into the receiving container. The tap hole B is closed.

Among the plugs, the expandable plug P is shown in FIG.
As shown in FIG. 7, it is inserted into the tap hole B in advance, receives heat from the metallurgical container A, and expands as shown in FIG. Then, as shown in FIG. 8, a block is formed by filling and closing the tap hole B of the metallurgical container A,
The outflow of the slag S from the tap hole B is prevented.

As a conventional technique of an expansive plug for closing a tap hole of a metallurgical container, Japanese Patent Application Laid-Open No. 2-11262 discloses a plugging material for blocking outflow of a metallurgical container and a method for cleaning internal slag of the metallurgical container. ing. This is a slag outflow prevention method in which an inactive plug and an inflatable plug are combined, but at present, the inflatable plug is often used alone as a tip outflow prevention method for the slag S.

The expandable plug 10 described in Japanese Patent Laid-Open No. 11262/1990, as shown in FIG. 9, is a temperature responsive core member 11 that expands immediately when heated, and the core is wrapped and softened by heat. And an outer surface layer 12 that is extensible to contain an inner expansion core. The temperature responsive core member 11 contributes to filling and closing of the tap hole, and the heat softening material of the outer surface layer 12 strengthens the strength of the block formed of the expansive material and serves as a refractory material forming the tap hole. It contributes to the adhesiveness. When the expandable plug 10 is inserted into the tapping port B of the metallurgical container A as shown in FIG. 6, the expandable plug 10 receives heat in the metallurgical container at 900 to 1000 ° C. and the expandable plug 10 as shown in FIG. , Heat softens, expands, and gradually expands in volume. And about 5-7
The maximum volume expansion of 30% takes place over a period of minutes to fill and close the tap hole as shown in FIG.

[0006]

As described above, the expansive plug described in Japanese Patent Laid-Open No. 11262/1990 requires about 5 to 7 minutes for filling and closing the tap hole. When the expansive plug is inserted into the tap hole before blowing, it is sufficient if the tap hole can be filled and blocked in about 5 to 7 minutes. But,
When inserting the expansive plug into the tap hole after the tapping is finished, the expansive plug expands within 2 minutes, and if the tap hole is not filled and blocked, it is used for metallurgy when tilting the scrap input for blowing. There was a technical problem that the expansion plug fell inside the container and it was impossible to prevent the slag from flowing out.

That is, when the expansive plug is inserted into the tap hole after tapping, the expansive plug must be expanded and filled within 1 to 2 minutes so as not to come into contact with the inner wall of the tap hole made of refractory. When the hot metal or scrap is tilted, the expansive plug falls inside the metallurgical container, and the expansive plug cannot serve as a slag outflow preventing material. Therefore, there is a technical problem that the conventional expansion plug, which expands and takes 5 to 7 minutes to block the tap hole, cannot be used as a slag outflow preventing material for the above purpose of use.

The present invention has been made to solve the above problems, and prevents the slag from flowing out of the metallurgical container in any use by shortening the expansion time of the expandable plug. It is an object of the present invention to provide an expandable plug that can be made.

[0009]

An expansive plug for closing a steel outlet of a metallurgical container according to the present invention is inserted into a steel outlet of a metallurgical container to prevent slag from flowing out into a receiving container. In the expandable plug for closing the tap hole of the metallurgical container for, an expandable plug body containing at least a temperature reaction component that expands when heated and a component that softens by heat,
Iron plates provided at both ends of the plug body, an iron rod that inserts the expandable plug body and the iron plate and locks the one iron plate at one end thereof, and an engagement member formed at the other end side of the iron rod. A stop member and a spring interposed between the iron plate and the locking member, and the repulsive force of the spring applies a compressive force in the axial direction to the expandable plug body to reduce expansion in the radial direction. The feature is that it is done in time.

[0010]

When the expandable plug according to the present invention is inserted into the tap hole B of the metallurgical container A, it receives heat in the metallurgical container at 900 to 1000 ° C., is softened and expanded, and gradually expands in volume. At this time, since the plug body is softened, the expansive plug body is prevented from expanding in the axial direction by the repulsive force of the spring, that is, the compressive force in the axial direction, and the volume expanding portion contributes to the expansion only in the radial direction. To do. Therefore, the expansive plug can come into contact with the inner wall of the tap hole in a short time, and even when the hot metal or scrap is tilted, the expansive plug falls inside the metallurgical container and prevents the slag outflow material. It doesn't stop functioning.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 is an expansive material core containing an expansive raw material, and 2 is an outer surface layer containing a substance softening by heat surrounding the core and capable of extending to accommodate an inner expansive material core. is there. The expansion material core 1 and the outer surface layer 2 form an expansion plug body.

Here, the expansive raw material is a raw material that generates steam to rapidly expand when heated, and for example, vermiculite, pearlite, etc. are used as the expansive raw material.
It is a substance that generates vapor and generates peeling at a temperature of 0 ° C. or higher, and it is said that its volume expansion is about 6 to 20 times. The vermiculite is also known as vermiculite, and the heat-expanded one is generally widely used for horticultural construction.
Further, pearlite is widely known by the name of perlite, and like vermiculite, the one that is heated and expanded is widely used as a building material or a heat insulating material and has been used for a long time. The expansive raw material is added in an amount of 30 to 80% by weight. If the addition amount is 30% by weight or less, the amount of expansion necessary and sufficient for filling the steel mouth cannot be obtained, so that when the metallurgical container is tilted, slipping out or slag flowing into the receiving container is observed. In addition, the expandable raw material 8
If 0% by weight or more of the expandable raw material is added, sufficient strength as a block body cannot be obtained, and when the block body is added, there is a risk that it will fall into the receiving container at the same time as the slag. Cannot be prevented.

As the heat softening raw material, plate glass, glass waste represented by bottle glass, frit and the like can be used. The heat softening raw material is added as a binder for the thermally expanded expansive raw material, and plays an important role in controlling the shape retention and strength of the expanded and expanded block. In addition to glass dust and frit, powder or liquid sodium silicate is also added to the heat softening material at the same time. Sodium silicate is an additive material that plays a role similar to that of glass dust and frit, and at the same time plays a role of a filling aid and a binder in the production of expandable plugs.

The amount of addition is 20 to 70% by weight of sodium silicate and 10 to 5 of glass dust and frit, either alone or mixed.
It is 0% by weight. Addition amount of glass frit is 20% by weight
If the amount is less than the above, the strength of the expanded and expanded block cannot be obtained, and if it is more than 70% by weight, the viscosity of the expandable plug during hot rises significantly, which causes the expansion of the expandable raw material to be significantly reduced. . Sodium silicate also showed similar development with vapor glass dust and frit when the addition amount increased and decreased, and 10% by weight
If it becomes the following, it may cause deterioration of the moldability of the expandable plug.

Further, in the figure, 3 is an iron plate attached to both ends of an expansion plug body constituted by the expansion material core 1 and the outer surface layer 2, and 4 is a substantial center of the expansion plug body and the iron plate 3. The one iron plate is locked to one end of the iron rod 4 by a tightening washer 6 that is locked and fixed to the iron rod 4. A locking washer 5 for locking is also attached to the other end of the iron rod 4 to lock the container 8 containing the spring. A spring 7 is interposed in contact with a container 8 containing the iron plate 3 and the spring. That is, one end of the spring 7 is in contact with the iron plate, and the other end is locked to the washer 5 via the side wall of the container 8.

Next, the manufacture of this expandable plug will be described. First, the expandable plug body is mixed and molded using a predetermined material, and the iron plates 3 are attached to both ends thereof,
The iron rod 4 is inserted through the central portion of the expandable plug body, and the washer 6 is attached to one end. Then, the spring 7 is inserted into the other end of the iron rod 4, and the spring accommodating container 8 is inserted therein. Then, the spring 7 is stored in the container 8 in a compressed state, and finally the washer 5 is attached to the iron rod 4 to lock the container 8. here,
Although the repulsive force of the spring 7 acts on the expandable plug body, the shape of the expandable plug is not destroyed by the force of the spring 7 because the expandable plug body is not thermally softened.

Next, the operation of the expandable plug will be described. When the expansive plug thus formed is inserted into the tap hole B of the metallurgical container A, it receives heat in the metallurgical container at 900 to 1000 ° C., is softened and expanded, and gradually expands in volume. At this time, since the plug body is softened, the expansive plug body is prevented from expanding in the axial direction by the repulsive force of the spring 7, that is, the compressive force in the axial direction, and the volume expansion is performed only in the radial direction. Become. Further, when the expandable plug main body cannot withstand the repulsive force (compressive force) of the spring 7 due to further softening, the iron plate 3 shown on the right side in the figure.
Moves axially left to compress the expandable plug body. As a result of this compression, radial expansion rapidly progresses, and the expandable plug body comes into contact with the inner wall of the tap hole. for that reason,
The expansive plug can come into contact with the inner wall of the tap hole in a short time, and the expansive plug does not fall inside the metallurgical container even when the hot metal or scrap is tilted.

Next, the time required for closing the tap hole is measured, and the example and the comparative example are compared and examined. First, the expansion plugs of the example and the comparative example were manufactured with the same material and compounding ratio to form an expansion plug body having a diameter of 140 mm and a length of 300 mm. Then, the iron plate, the iron rod, the spring, the container, and the washer were attached to the expansion plug body of the embodiment as described above. Then, it was inserted into a tap hole having a diameter of 180 mm, and the time required for blockage was measured. The results are shown in the table below.

[0019]

[Table 1]

As is clear from the above table, in the comparative example, the tapping hole temperature before insertion was 980 ° C. for 5 minutes to completely close the tapping port. On the other hand, in the embodiment, although the tapping temperature before insertion is 950 ° C., which is lower than that in the comparative example, the tapping port can be completely closed in a short time of 70 seconds. It was

In the present invention, as shown in FIG. 3, a cylindrical cardboard or a cylindrical member 9 made of soft iron may be formed on the outer circumference of the expansion plug body. The cylindrical member 9 is used when the expansion material, the softening material and the like are cast and filled. Moreover, the cylindrical member 9 has an effect that it can be inserted into the tap hole without causing the expansion plug body to lose its shape.

Further, although the iron bar and the iron plate and the iron bar and the container are locked by a washer, the iron plate and the container do not come off from the iron bar during use, such as tightening nuts and welding stoppers, and resist the repulsive force of the spring. Any method can be adopted as long as measures are taken to hold the expansion plug body sufficiently. Furthermore, as a means for applying a compressive force,
Although a leaf spring or the like can be used in addition to the coil spring as shown in the figure, when the coil spring is used, the spring may fall off in the extended state because the iron bar is inserted through the center of the coil spring. It is possible to give a stable compression force.

[0022]

According to the present invention, it is possible to contact the inner wall of the tap hole in a shorter time as compared with the conventional expansion plug to close the inner wall of the tap hole. This has the effect of preventing the expansive plug from falling off. Moreover, unlike the conventional expansion plug, the purpose of use is not limited, and the slag can be effectively prevented from flowing out in any use.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the expansion plaque shown in FIG. 1 has expanded in the radial direction.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a view for explaining the outline of an expandable plug for closing a tap hole of a metallurgical container.

FIG. 5 is a view for explaining an outline of an expansive plug for closing a tap hole of a metallurgical container.

FIG. 6 is a cross-sectional view for explaining a state in which the expandable plug for closing the steel exit of the metallurgical container is inserted into the steel exit.

FIG. 7 is a cross-sectional view for explaining an expanded state of an expandable plug for closing a tap hole of a metallurgical container.

FIG. 8 is a cross-sectional view for explaining a closed state of the expandable plug for closing the tap hole of the metallurgical container.

FIG. 9 is a sectional view showing an expansive plug for closing a tap hole of a conventional metallurgical vessel.

[Explanation of symbols]

 1 Expansion Material Core 2 Outer Surface Layer 3 Iron Plate 4 Iron Bar 5 Washer 6 Washer 7 Spring 8 Container

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[Procedure amendment]

[Submission date] July 25, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

[Explanation of the Invention] Expandable plug for closing a tap hole of a metallurgical container

Front page continuation (72) Keisuke Yamazaki 1st Nanto, Ogakie-cho, Kariya city, Aichi Toshiba Ceramics Co., Ltd., Kariya factory Kashima Works Co., Ltd. (72) Inventor Minoru Sato 2-1-1 Hitotsubashi Chiyoda-ku, Tokyo Josuikai Building Sumitomo Corporation (72) Inventor Masashi Toyohara 2-1-1 Hitotsubashi, Chiyoda-ku, Tokyo Josuikai Bill Sumitomo Corporation

Claims (1)

[Claims] 1. An expansive plug for closing a tap hole of a metallurgical container for preventing slag from flowing out into a receiving container, which is inserted into the tap hole of a metallurgical container, and expands at least when heated. An expansive plug body containing a temperature-reactive component and a component softened by heat, iron plates provided at both ends of the plug body, the expansive plug body and the iron plate, and the one end of the one An iron bar for locking the iron plate, a locking member formed on the other end side of the iron bar, and a spring interposed between the iron plate and the locking member, and the expansion due to the repulsive force of the spring. An expandable plug for closing a tap hole of a metallurgical container, which is characterized in that an axial compressive force is applied to a flexible plug body so as to expand in a radial direction in a short time.