JP2587827Y2 - Converter tap tap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug for closing a tapping hole of a converter.

[0002]

2. Description of the Related Art A converter is a refining furnace for producing steel by removing components such as carbon, phosphorus and sulfur from pig iron, and has a tapping outlet for removing molten steel on a side wall. After refining, slag generated by refining accumulates in the upper layer of molten steel,
When the molten steel is taken out from the tap hole by tilting the converter, it is necessary to take out the molten steel so that slag does not flow out. Therefore,
Before removing the molten steel, plug the tap into the tap to prevent slag from being discharged from the tap at the initial stage of tilting the converter.
After the molten steel reaches the tapping port as the converter tilts, the stopper is removed and only the molten steel is taken out.

Conventionally, various plugs have been used as plugs for closing tap holes. Japanese Utility Model Publication No. 2-10450 discloses a tap for a tapping outlet having a structure in which a thermosetting coating layer is coated on the surface of an inorganic fiber molded article. Generally, an inorganic fiber molded article has a large porosity and a small specific gravity. For this reason, stoppers made mainly of inorganic fibers are light and easy to handle.

[0004]

However, a tap for a tapping hole using an inorganic fiber molded article has a large porosity, so that the molded article itself shrinks during use and the plug falls off the tapping port. The danger was great.

In view of such problems, the present invention takes advantage of the features of the inorganic fiber molded body, which is light and easy to handle, and shrinks and falls off when installed in a steel tap of a converter. It aims to provide a tap for tapping holes without danger.

[0006]

The present invention solves the above-mentioned problems, and comprises a substrate 2 and a thermal expansion layer 3 coated on the outside of the substrate 2, wherein the substrate 2 is a molded article mainly composed of inorganic fibers. The invention is characterized in that a plug for a converter steel outlet is characterized in that the formed thermal expansion layer 3 is formed of a slurry composition which expands and softens by heating.

[0007]

When the tap 1 for tapping is inserted into the tap of a converter immediately before taking out molten steel, the base 1 is sufficiently compressed and deformed to bring the tap 1 into close contact with the tap. After a lapse of time, the plug is heated, the thermal expansion layer expands, for example, about 3 to 4 times, and a part or all of the layer is softened and fused to the base 2 and the inner wall of the tap hole. This expansion and softening protects the substrate 2 from erosion. Even if a local gap occurs between the tap 1 and the tapping hole, the gap is filled by the action of the thermal expansion layer 3. Further, even if the base 2 contracts due to heat, the contraction can be automatically compensated for by the expansion of the thermal expansion layer 3.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a converter tapping tap according to the present invention, and FIG. 2 is a longitudinal sectional view of the converter tapping tap of FIG.

The converter tap 1 is composed of a base 2 and a thermal expansion layer 3 coated on its surface.
The thermal expansion layer 3 covers a part of the substrate surface or the entire surface. In this embodiment, the portion disposed outside the converter (the bottom surface of the plug 1 in the drawing) is not covered. Therefore, the base 2 is exposed on the bottom surface. The base 2 is formed of a molded body mainly composed of inorganic fibers.

The inorganic fibers constituting the substrate 2 include glass fibers, rock wool, slag wool, asbestos, ceramic fibers,
Carbon fiber or the like can be used. Further, the base 2 may be formed of a mixture thereof. The type, mixing ratio, and the like of the inorganic fibers to be used can be appropriately determined according to the size of the converter, operating conditions, the diameter of a tapping hole, and the like.

A known binder is added to these inorganic fibers,
If necessary, an inorganic powder such as silica or alumina may be added to form a slurry, and the slurry may be formed into a truncated cone shape by casting or vacuum forming. As the binder, for example, colloidal silica, water glass, various resins and the like can be used. Further, a thin plate may be formed by the above-described method, and the thin plate may be laminated and formed into a predetermined shape.

The bulk specific gravity of the substrate 2 is preferably set to 0.20 to 0.35. More preferably, 0.25
Set to 0.30. When the bulk specific gravity is less than 0.20, the shrinkage rate becomes large, and there is a high possibility that the bulk material falls out from the tapping port. On the other hand, when the bulk specific gravity exceeds 0.35, it becomes too hard to cope with slight deformation of the tapping hole, and the adhesion is deteriorated.

The shape and size of the plug 1 are determined by the shape and size of the tapping hole to be used. The shape of the plug 1 is preferably a truncated cone or a truncated cone similar to a truncated cone in consideration of the fact that the tap hole is generally circular in cross section and the plug itself can be easily inserted. . It is desirable to provide a small hole 4 in the axial direction at the center of the bottom surface of the plug 1. By inserting the holding tool into the small hole 4, handling during carrying and use becomes easy.

The thermal expansion layer 3 of the present invention is configured to be at least partially melted when heated, and to expand to a volume of 2 to 6 times, preferably about 3 to 4 times. The thermal expansion layer 3 is mainly composed of a thermal expansion mineral that expands by heating, such as vermiculite, perlite, and the like, and a fused material that softens by heating, such as glass powder. It is composed of a composition obtained by adding and mixing an inorganic fiber effective for the above. The mixing ratio of these three components is preferably set to 25 to 75% by weight of the thermal expansion mineral, 20 to 70% by weight of the fused material, and 5 to 15% by weight of the inorganic fibers.

[0015] The three components are mixed in the above-mentioned ratio, and an additive such as a binder is added to prepare a slurry. This slurry is applied to a predetermined portion of the substrate 2, in this case the entire side surface and the surface 5 on the side coming inside the furnace. The application of the slurry may be performed by any method, such as a method of submerging the substrate 2 in the slurry, a method by spraying, or brush coating. The coating thickness of the slurry is such that the thickness of the thermal expansion layer 3 after drying is 2 to 10 mm.
So that The thickness is preferably set to 4 to 6 mm. If the thickness of the thermal expansion layer 3 is out of the above range, the effect of providing the thermal expansion layer is not sufficient, or the fluidity becomes excessively large, causing problems. After applying the slurry, the plug 1 is obtained by sufficiently drying.

[0016]

The converter tap of the present invention comprises a base 2 and a thermal expansion layer 3 coated on the outside of the base. The base 2 is formed of a molded body mainly composed of inorganic fibers. Since the expansion layer 3 is formed of a slurry composition that expands and softens by heating, when the plug 1 is set to a tapping port, the heat expansion layer 3 expands and softens by receiving heat. For this reason, the stopper 1 is press-bonded and fused to the tapping port, and can be securely fixed without danger of falling off. Also, even if the tapping shape is slightly deformed, the plug 1 itself deforms and absorbs it, so there is no danger of falling off.
We can use in peace. Further, since the base material 2 is made of inorganic fibers, the plug 1 itself is reduced in weight, and is easy to carry and use during use.

The present invention is not limited to the embodiment described above. For example, the thermal expansion layer may have a multilayer structure by changing the mixing ratio of the materials. Further, the substrate can also have a multilayer structure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a converter tap for a converter steel tap according to the present invention.

FIG. 2 is a longitudinal sectional view of the plug for a converter tap hole of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plug 2 Base 3 Thermal expansion layer 4 Small hole 5 Surface coming inside furnace

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C21C 5/46 103 F27D 3/14 B22D 41/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A substrate (2) comprising a substrate (2) and a thermal expansion layer (3) coated on the outside thereof, wherein the substrate (2) is formed of a molded article substantially free of thermal expansion using inorganic fibers as a main material. A plug for a converter steel outlet, wherein the expansion layer (3) is formed of a slurry composition that expands and softens when heated.