JP3133811U - Unfixed refractory anchor device - Google Patents

Abstract

An anchor device that has high heat resistance and does not damage a refractory structure.
In an anchor device for supporting and fixing an amorphous refractory used in a high-temperature furnace or the like or a lightweight heat-insulated amorphous refractory to an iron shell, a male screw part is processed at least at one end of a metal anchor member. Then, a female screw part is processed inside the ceramic protective cap member, the male screw part and the female screw part are screwed and fastened, and the cap member is attached to the metal anchor member.
[Selection] Figure 1

Description

The present invention relates to an anchor device for fixing and supporting an amorphous refractory used mainly in a high temperature furnace or the like whose furnace material surface temperature is 1400 ° C. or higher, or a lightweight heat-insulated amorphous refractory.

  Unshaped refractories used for steelmaking ladle or tundish lid, etc. are exposed to high temperature because they are used near the molten steel surface, and are cooled rapidly when the lid is removed. This is a part where refractory is easily peeled and dropped due to repeated heating and cooling.

As an energy-saving measure that has been regarded as important in recent years, there is a case where a high-fire-resistant, lightweight, heat-insulating and irregular-shaped refractory is applied to the above-mentioned steel ladle or tundish lid, etc. Lightweight heat-insulated amorphous refractories generally have lower material strength than ordinary amorphous refractories, and therefore tend to be more easily peeled off than when applying general amorphous refractories.

Various stainless steel anchors corresponding to the expected operating temperature for the above application are used to fix the refractory to the iron skin to prevent peeling off (see Patent Document 1).
Japanese Patent Laid-Open No. 11-183041

However, when trying to fix and hold an amorphous refractory using a stainless steel anchor device on the steel ladle or tundish lid, the thermal expansion coefficient of stainless steel is generally much higher than that of the amorphous refractory. Therefore, the stainless steel anchor member presses the amorphous refractory, and stress is generated at the location of the amorphous refractory in contact with the stainless steel anchor member. There is a tendency for cracks to occur in the object and to promote peeling and falling off.
In particular, in the case of a highly fire-resistant lightweight heat-insulating amorphous refractory, the above-mentioned tendency is remarkably recognized because the material strength is lower.

  An object of the present invention is to provide a highly heat-resistant anchor device that prevents cracks occurring in an amorphous refractory at the tip of a metal anchor member such as stainless steel, and that does not easily cause the amorphous refractory to peel off.

In the anchor device of the present invention, a male thread portion is processed at least at one point of the metal anchor member tip portion for supporting and fixing the amorphous refractory on the furnace inner surface of the iron skin, and the female thread portion is formed inside the ceramic protective cap member. Then, the male screw part and the female screw part are screwed and fastened, and the cap member is attached to the tip of the metal anchor member.

For the purpose of preventing damage such as cracking of the ceramic protective cap member due to the influence of large thermal expansion of a metal such as stainless steel, the male screw portion at the tip portion of the metal anchor member and the female screw portion inside the protective cap member made of ceramic, It is desirable to process so that a slight gap is generated.

The material used for the ceramic protective cap member is preferably selected from high alumina, zirconia, and silicon nitride. However, if it is high alumina, it is possible to divert the ceramic insert device embedded in the concrete for the purpose of supporting concrete panels widely used in the construction civil engineering field. It is possible to obtain the anchor device of the present invention at low cost.

By using the anchor device of the present invention, the ceramic protective cap has a very large thermal expansion compared to the amorphous refractory that occurs when a metal material such as stainless steel used for the anchor member is exposed to high temperatures. Since the gap existing between the member and the anchor member tip can be absorbed to some extent, the stress generated by the difference in expansion can be reduced.

Furthermore, since the strength of the ceramic protective cap member is generally higher than that of the amorphous refractory, cracks generated in the amorphous refractory at the tip of the anchor member can be reduced compared to when the ceramic protective cap member is not attached. Is possible. In particular, in the case of a lightweight heat-insulating amorphous refractory, the strength is generally significantly lower than that of a protective cap member made of ceramic, so that the obtained effect becomes larger.

As is clear from the above description, according to the anchor device of the present invention, it is possible to prevent the separation and dropping of the amorphous refractory in a high-temperature furnace in which the ambient temperature is 1400 ° C. or higher. This makes it possible to extend the life of the refractory lining and greatly contribute to cost reduction.

In addition, the ceramic protective cap member of the present invention can be used as a ceramic insert device embedded in concrete for the purpose of supporting concrete panels widely used in the civil engineering industry. It is possible to make purchase arrangements more quickly and at a lower cost than when a ceramic protective cap member is separately manufactured for physical use.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a lining configuration of a ladle lid for steel making according to the present embodiment. The constituent members are: a constructed lightweight heat-insulating amorphous refractory 1, a Y-type stainless steel anchor member 2 welded to the iron skin 6, a ceramic protective cap member 3 in which the female screw portion is not processed, and a female screw The protective cap member 4 is made of a ceramic processed portion 7 and a screw fastening portion 5.

The Y-shaped anchor member 2 is made of a material SUS310S. The ceramic protective cap member 3 in which the female screw portion is not processed and the ceramic protective cap member 4 in which the female screw portion 7 is processed are formed of high alumina, and these are made of concrete panels in the civil engineering construction industry. Ceramic inserts that are widely used for support are used.

FIG. 2 shows the ceramic protective cap members 3 and 4 used in this embodiment. Inside the ceramic protective cap member 4, there is a hollow portion 8 that has not been subjected to female screw processing behind the female screw portion 7. Is provided. Due to the presence of the hollow portion 8, a void into which the Y-type anchor member 2 is not inserted is created, and when this void is exposed to a high temperature, it plays a role of absorbing large thermal expansion generated in the Y-type anchor member 2, and a protective cap made of ceramic. The effect which prevents the damage of the member 4 is produced.
Moreover, the cavity diameter inside the ceramic protective cap member 3 is larger than the diameter of the Y-shaped anchor member 2, and this gap prevents the ceramic protective cap member 3 from being damaged for the same reason as described above. It produces the effect.

FIG. 3 shows the Y-shaped anchor member 2 used in this embodiment, and a male thread portion 9 is machined at the tip. By machining the male screw portion 9 slightly smaller than the female screw portion 7 processed inside the ceramic protective cap member 4, a slight gap is generated between the male screw portion 9 and the female screw portion 7, and this gap For the same reason as above, the ceramic protective cap member 4 is prevented from being damaged.

In this way, by implementing the structure of the ladle lid for steel making of this embodiment, the tip of the stainless steel anchor has been a problem in the structure in which the lightweight heat-insulating amorphous refractory is fixedly held on the iron skin only by the conventional stainless steel anchor It has become possible to prevent the peeling-off phenomenon of the lightweight heat-insulating amorphous refractory, which is caused by the cracks in the light-weight heat-insulating amorphous refractory generated at the section.
This is because the protective cap members 3 and 4 that are screwed and fastened with the stainless steel anchor member 2 described above are not damaged even if they are exposed to high temperatures during use. It was possible to prevent the refractory 1 from cracking and, as a result, dramatically improve the life of the ladle lid for steel making of this example.

The present invention is not limited to the above embodiment, but can be applied not only to the ladle lid for steel making, but also to irregular refractories used for the lining of various industrial furnaces. The material of the regular refractory can be changed.

It is a vertical sectional view of the principal part of the iron skin using the anchor device of the present invention. It is a side view of the ceramic protective cap member with which the metal anchor member of the anchor device of FIG. 1 was mounted. It is a side view of the metal anchor member of the anchor device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indeterminate refractory 2 Stainless steel anchor member 3 Ceramic protective cap member which does not process internal thread part 4 Ceramic protective cap member which processed internal thread part 5 Threading fastening part 6 Iron skin 7 Internal thread part 8 Internal thread part is processed Unfinished cavity 9 Male thread

Claims (4)

  A male screw part is machined at least at one point of the metal anchor member tip for supporting and fixing the amorphous refractory on the furnace inner surface of the iron skin, and the female screw part is machined inside the ceramic protective cap member. And the female screw part are screwed and fastened, and the cap member is attached to the tip of the metal anchor member. Inside the ceramic protective cap member, there is a hollow portion that is not subjected to female screw processing at the back of the female screw portion, and the presence of the hollow portion creates a gap in which the metal anchor member is not inserted. The anchor device according to claim 1, characterized in that: By setting the male screw portion processed at the tip of the metal anchor member slightly smaller than the female screw portion processed inside the ceramic protective cap member, a slight gap is created between the male screw portion and the female screw portion. The anchor device according to claim 1 or 2, wherein the anchor device is formed. A male screw part is machined at least at one point of the metal anchor member tip for supporting and fixing the amorphous refractory on the furnace inner surface of the iron skin, and the female screw part is machined inside the ceramic protective cap member. The cap member is attached to the tip of the metal anchor member by screwing and fastening the female screw portion, while the cap member made of ceramic is formed by processing the female screw portion inside the metal anchor member. Adjacent, another ceramic protective cap member is mounted, and the cavity diameter inside the another ceramic cap member is set larger than the diameter of the metal anchor member, and a gap is created between them. An anchoring device for irregular refractories.

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