JPH0629764U - Plate bricks and nozzle bricks for slide valve devices - Google Patents

Abstract

(57) [Summary] [Structure] The present invention is an S.M. The plate brick and the nozzle brick used in the V apparatus are characterized in that at least one crack expansion preventing hole is provided, and the crack expansion preventing hole may have a configuration of penetrating in the axial direction of the molten steel flow hole or a bottomed perforation shape. [Advantages] With the above-described technical structure, cracks from the outer peripheral portion do not expand beyond the stop holes and do not reach the molten steel circulation holes, and therefore oxidation of the refractory due to air intake from the outside. , The life was stable without melting and the trouble of abnormal melting due to intake air disappeared.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanism of a crack expansion preventing hole (hereinafter, simply referred to as a stop hole) provided to prevent a crack generated in a plate brick and a nozzle brick used in a slide valve device for a molten metal container.

[0002]

[Prior art]

 As is well known, a plate brick used for a slide valve (hereinafter referred to as SV) device has a steel band or hoop attached to the outer periphery for the purpose of reinforcement. S. When using the V device, tensile stress is generated in the outer peripheral part of the plate brick due to the difference in thermal expansion due to the temperature difference caused by the molten steel passing through the molten steel flow hole, cracks are generated from the outer peripheral part, and molten steel flow is caused. It is known that cracks may reach the holes, causing dangerous situations such as steel leak accidents.

Therefore, in order to suppress the occurrence of cracks, the plate bricks and the nozzle bricks are uniformly formed as an integrated type, or a refractory material is provided in the axial direction of the molten steel flow holes of the plate bricks and the nozzle bricks. It has been reported that a layered structure is provided, or a notch or a radial groove is provided on the outer peripheral portion or the back surface of the plate brick to determine a crack generation position.

[0004]

[Problems to be solved by the device]

 In the uniform molded integral refractory as described above, the location of cracks cannot be specified, and if it occurs on an important working surface, melting damage on the working surface is promoted, which shortens the service life or causes a troublesome trouble. . Further, if a crack penetrates from the outer peripheral surface to the molten steel flow hole, the air is sucked in and the refractory is oxidized, which promotes melting loss and causes abnormal melting loss, further promoting the shortening of life and the occurrence of trouble.

Further, in the above-mentioned two-layer structure, separately molded ones are joined and assembled by mortar or the like, and a plate brick requires a sliding surface to be processed, resulting in a high manufacturing cost and a fire resistance of the two-layer structure. Cracks that penetrate objects are likely to occur, and the same drawbacks as described above are inevitable.

[0006]

[Means for Solving the Problems]

 The inventors of the present invention developed a plate brick and a nozzle brick of the present invention as a result of various studies and experiments in order to eliminate the above-mentioned drawbacks of the conventional method. The technical configuration of the present invention is a molten metal container. For S. The plate brick and the nozzle brick used in the V apparatus are characterized in that at least one crack expansion preventing hole is provided, and the crack expansion preventing hole may have a structure of penetrating in the axial direction of the molten steel flow hole or a bottomed perforated shape. Often, by adopting such a technical configuration, cracks from the outer peripheral portion do not expand beyond the stop hole and do not reach the molten steel circulation hole, and therefore refractory materials caused by air intake from the outside Oxidation and erosion did not occur, the life was stable, and the trouble of abnormal erosion due to intake air disappeared.

The technical configuration of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show a specific example in which the present invention is applied to a plate brick, FIG. 1 is a plan view, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view showing another example. It is a figure.

The plate brick 10 equipped with the steel hoop 11 includes a molten steel flow hole 12 and a molten metal stop position indicated by a dotted line 13, and is provided in a portion of the plate brick other than the broken line hatching region 14 which is 20 m / m wider than the flow hole radius. There are two stop holes 1 invented. The stop hole 1 is formed by penetrating a plate brick similarly to the molten steel flow hole 12.

In the case of a plate brick, cracks often occur near the molten steel flow hole 12 on the long side of the structure of the brick as shown in FIG. 1. Therefore, these penetration stop holes 1 should be provided at the positions shown in the drawing. preferable. When the crack 2 has progressed and expanded toward the center of the molten steel flow hole 12, the generated crack 2 reaches the stop hole 1 to stop the expansion and prevent the crack from further progressing.

FIG. 3 is a sectional view similar to FIG. 2 showing another example of the stop hole, and this stop hole 1'is not a through hole but a bottomed hole. Even with this bottomed perforation 1 ', its function and effect are the same as those in FIGS. Although the number of stop holes is at least one, it is preferable to provide the stop holes on both sides of the molten steel flow hole 12 in the sliding direction as shown in the figure. Further, the depth of the stop hole in this case is 20% or more of the thickness of the plate brick or the height of the nozzle brick.

4 to 7 show an example in which the stop hole of the present invention is applied to a nozzle brick, FIG. 5 is a vertical cross-sectional view taken along line BB of FIG. 4, and FIGS. 6 and 7 show other stop holes. It is a longitudinal cross-sectional view showing an example.

The position of the stop hole 21 in the nozzle brick 20 is also most effective when the hole is close to the outer circumference of the nozzle brick with respect to the molten steel flow hole 12, that is, the portion where the tensile stress is highest at the time of pouring the molten steel. Also, it is not preferable to provide it near the molten steel circulation hole from the viewpoint of preventing steel leakage.

FIG. 6 is an example in which the stop hole 21 is penetrated from the top to the step of the nozzle brick 20, and FIG. 7 is an example in which the nozzle brick 20 is drilled with a bottom from the vertical direction. Depending on the case, either the upper side or the lower side may be used.

The number of the stop holes 21 in the nozzle brick is at least one, but it is preferable to provide three stop holes 21 with a central angle of 120 ° as shown in FIG.

The diameter of the through hole or the stop hole of the bottomed perforation described above is determined in accordance with the size of the plate brick or the nozzle brick, and is approximately 5 to 30 mmφ.

[0017]

[Effect of device]

 (1) By providing a stop hole as in the present invention, a crack does not penetrate from the outer peripheral portion of the plate brick or the nozzle brick to the molten steel flow hole, and the progress and expansion are prevented in the stop hole.

(2) Therefore, there is no melting loss due to oxidation of the refractory due to air intake from the outside, the life is stable and the life is extended, and troubles such as abnormal melting damage due to intake are eliminated.

[Brief description of drawings]

FIG. 1 is a plan view of an example in which the present invention is applied to a plate brick.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing another example.

FIG. 4 is a plan view of an example in which the present invention is applied to a nozzle brick.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a cross-sectional view showing another example of a nozzle brick.

FIG. 7 is a cross-sectional view showing another example of a nozzle brick.

[Explanation of symbols]

 1 Stop hole 2 Crack 10 Plate brick 11 Steel hoop 12 Molten steel distribution hole 20 Nozzle brick 21 Stop hole

Claims (3)

[Scope of utility model registration request] 1. A plate brick and a nozzle brick for a slide valve device, wherein at least one crack expansion preventing hole is provided in a plate brick and a nozzle brick used for a slide valve device for a molten metal container. 2. The plate brick for a slide valve device and a nozzle brick according to claim 1, wherein the crack expansion preventing hole penetrates in the axial direction of the molten steel flow hole of the plate brick or the nozzle brick. 3. The plate brick for a slide valve device and the nozzle brick according to claim 1, wherein the crack expansion preventing hole has a bottomed perforation shape.