JPH07251260A - Structure for fixing plate for sliding nozzle to metallic frame - Google Patents

Abstract

PURPOSE:To simplify the fitting/removal of a plate having a metal case to and from a metal frame and to facilitate the exchanging work even in the high temp. after casting by forming a projection of the metal case so as to be fittable to the recessed part of the metal frame and forming a specific gap to the fitting. CONSTITUTION:The gap for the fitting between the projected part 6 of the plate and the recessed part 10a of the metal frame, is formed so as to be 0.1-1.0mm to the sliding direction of the plate, in order to synchronize the plate with the movement of the metal frame 11 at the time of sliding. However, in order to simplify the fitting/removal, the high accurate fitting is adopted only to the sliding direction in the positional direction being important at the time of casting, and a rather play is given in the right angle direction to the sliding direction. Therefore, as the fitting/removal of the fixing plate or the sliding plate for sliding nozzle device to the fixing metal frame or the sliding metal frame can easily be performed by manual means or mechanical means, the exchanging work of the plate can easily be performed in any case of the cold state and the hot state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a refractory plate to a metal frame in a sliding nozzle device mounted on a molten metal container to control the amount of molten metal extracted.

[0002]

2. Description of the Related Art Refractory plates in a sliding nozzle device have at least one molten metal passage hole, and there are a two-plate type and a three-plate type in which a fixed plate and a sliding plate are respectively combined. The upper plate and the lower plate, and the three-plate type upper plate and the lower plate are, as disclosed in Japanese Patent Laid-Open No. 48-6932, a metal case surrounding the side surface and the non-sliding surface of the plate refractory. I have it.

The means for fixing the plate provided with the metal case to the metal frame is disclosed in Japanese Utility Model Publication No. Sho 49-119422, Japanese Utility Model Publication No. 52-115607, and Japanese Patent Laid-Open No. 60-2347.
There are many proposals as seen in Japanese Patent Laid-Open No. 65.

In this sliding nozzle device,
It is extremely important for efficient operation of the apparatus that the plates be easily attached to and removed from the metal frame when they are exchanged and assembled. As one of the measures for this, for example, Japanese Patent Laid-Open No. 1-218761.
In the publication, there is a fixing structure that is concentric with the through hole and has substantially no play with respect to the metal frame so that the plate can be easily centered with respect to the metal frame. It is disclosed. However, in this fixing structure, it is necessary to provide a plate housing part that is slightly larger than the outer shape of the metal case for positioning around the molten metal passage hole of the metal frame, so that the temperature difference between the metal case and the metal frame is large. If this happens, the gap between the metal case and the metal frame during cold will become smaller, making it difficult to mount the metal case of the plate.In some cases, the metal case will fit into the metal frame and the plate will not come off, which will cause operational problems. It may cause trouble.

[0005]

An object of the present invention is to easily attach and detach the plate having the metal case to and from the metal frame, and to easily replace the plate even at a high temperature after casting. Moreover, it is to provide a structure for fixing a plate to a metal frame in a sliding nozzle device that can be finished by a simple manufacturing process.

[0006]

According to the present invention, a plurality of protrusions are formed on the outer surface of a metal case on the back side of a sliding surface of a plate, and the metal case is formed on the metal frame surface corresponding to the metal case of the plate. The recesses of the metal case and the recess of the metal frame are formed so that they can be fitted to each other, and the plate slides through the fitting gap between the metal case and the metal frame. 0.1 to direction
It is characterized in that it is formed to have a thickness of 1.0 mm.

The protrusions have an outer diameter of 3 minutes of the plate width so that the gap in the sliding direction of the protrusions of the plate during cold working does not fluctuate as much as possible due to the temperature load during casting. A cylindrical shape having a diameter of 1 or less or a rectangular tubular shape having a width length, and the height of the cylindrical portion or the rectangular tubular portion is 1 to 5 mm, and the curved top portion continuous to the cylindrical side surface. Can be formed.

The projection of the metal case is formed in a so-called trumpet shape, which is continuous with the cylindrical portion in the sliding surface direction, forms a gentle curved surface and is smoothly connected to the horizontal surface of the bottom of the metal case. The height can be matched with the thickness of the joint material filled between the brick and the metal case.

The method of manufacturing the metal case may be welding, forging, pressing, cutting or a combination thereof, but the single step of pressing is the simplest and most efficient. When pressing, a press die is required, and in order to extend the life of the die, it is preferable that the curved surface of the die be gentle, and the height of the cylindrical shape that is in the pressing direction be 5 mm or less, and further, it is continuous to the cylindrical portion. , A bowl-shaped shape that waits for a curvature that will not cause mold pain.

[0010]

When the plate slides, in order to synchronize with the movement of the metal frame when the plate slides, the projections fit into the recesses of the metal frame and the clearance is 0.1 to 1.
Although it has an outer diameter of 0 mm, as a device to make it easy to attach and detach the plate and metal frame, a highly accurate fit is adopted only in the sliding direction in the important positioning direction during casting, and it is perpendicular to the sliding direction. The plate is easy to remove due to the considerable play in the direction.

Further, due to the temperature load during normal casting, a temperature difference occurs between the temperature of the projection of the plate and the temperature of the plate fitting portion of the metal frame. That is, the temperature on the plate side becomes higher than the temperature on the side of the metal frame of 20 to 100K, and it works in the direction of reducing the gap in the sliding direction. By reducing the outer diameter to one third or less of the plate width, it is possible to reduce the difference in the gap in the sliding direction between cold and hot. By reducing the difference between the cold and hot gaps, it is possible to prevent the rattling when the plate slides from becoming too large, and conversely the gap becomes too small to prevent the protrusions from coming off the sliding metal frame.

In order to facilitate the attachment / detachment of the plate to / from the metal frame, the protrusion has a cylindrical portion having a height of 1 to 5 mm, and further has a bowl-like shape continuous to the cylindrical portion. If the cylindrical shape of the protrusion, that is, the height of the fitting portion is 1 mm or less, poor fitting occurs, and the height of the cylindrical portion is 5 m.
If it is more than m, the attachment and detachment of the plate will be a pull-out action and it will be difficult to do. Further, during sliding, not only the shearing force but also the bending force acts on the protrusion, and the strength of the protrusion becomes insufficient. When trying to fit the plate into the metal frame, the bowl-shaped protruding portion following the cylindrical shape serves as a guide. Further, in order to prevent the plate from swinging during sliding, the projections are formed in plural.

The protrusion of the metal case fits into the concave portion on the metal frame side. Of course, the metal frame side can be formed as the protrusion and the metal case side can be formed as the concave portion. There is a problem with the structure to be attached. That is, when the recess is formed and used on the metal case side, the thickness of the joint material of the metal case and the refractory becomes extremely thick because the height of the recess must be added. There is also a method of forming a recess in the refractory body, but this is not preferable because cracking of the refractory material is likely to occur.

[0014]

EXAMPLE An example in which the present invention is applied to an upper fixed plate of a sliding nozzle device composed of two plates will be shown as an example.

Embodiment 1 FIG. 1 is a plan view of a first embodiment of the present invention, and FIG. 2 is a vertical sectional view of FIG. 1 taken along the line AA.

In the figure, 1 indicates a plate refractory which is usually made of alumina, zirconia, zircon, alumina-carbon or magnesia. Reference numeral 2 denotes a metal case that surrounds the sliding surface except the sliding surface. 3 is a refractory mortar loaded between the plate refractory 1 and the metal case 2, 4 is a molten metal passage hole, and 5 is a sliding surface. A sliding plate (not shown) is arranged in contact with the sliding surface 5, and the sliding movement of the sliding plate in contact with the sliding surface 5 causes the molten metal passage hole 4 in the fixed plate The degree of opening of the molten metal passage hole 4 is adjusted by overlapping with the molten metal passage hole of the sliding plate, and the flow rate of the molten metal flowing down in the molten metal passage hole 4 is adjusted. Reference numeral 6 denotes a protrusion provided on the outer surface of the metal case 2 on the back side of the sliding surface 5 of the plate and for positioning the metal frame and the plate. Two protrusions 6 are formed to receive the sliding force of the metal frame and prevent the plate from moving in a horizontal plane. The planar shape of the protrusion 6 is a simple circle, and the outer shape of the cylindrical portion 8 is finished with high accuracy of ± 0.2 mm, and the radius of the circle is the plate width 200.
It is 36 mm, which is one third or less of mm. The protrusion 6 of the metal case is formed in a so-called trumpet shape, which is continuous with the cylindrical portion in the sliding surface direction and draws a gentle curved surface and is smoothly connected to the horizontal surface of the bottom of the metal case. However, the structure is made to match the thickness of the joint material filled between the brick and the metal case, and the return portion 7b also serves as the joint projection. Reference numeral 7a indicates a joint projection for keeping the mortar joint thickness constant. Metal case 2
Has a practical thickness of 1 to 6 mm, and was manufactured by press molding using carbon steel having a plate thickness of 3.2 mm here. The radius of curvature of the bent portion processed portion is at least 3 to 8 mm in order to suppress wear of the press die during press molding. The plate was obtained by placing mortar in the metal case 2, press-fitting a plate refractory, and then drying. About 10 small holes (not shown) were provided in the metal case in order to release air during press-fitting and to accelerate drying during drying.

FIG. 3 is a sectional view showing a state in which the concave portion of the metal frame 11 is fitted in the protrusion 6 of the metal case 2 of the plate shown in FIGS. 1 and 2 as seen from the direction perpendicular to the sliding direction of the plate. 4 shows a sectional view of the portion shown in FIG. 3 as seen from the sliding direction. In the figure, 10a indicates a recess formed in the metal frame 11 so as to fit with a plurality of protrusions 6 formed on the outer surface of the metal case 2 on the back side of the sliding surface 5 of the plate shown in FIGS. A play allowance of 1 to 10 mm is provided between the outer surface of the projection 6 and the inner surface of the recess 10b in the direction perpendicular to the sliding direction of the plate.

In the plate fixing structure described above, when the plate is mounted, a bowl-shaped curved portion of the top corner portion following the cylindrical portion 8 of the protrusion 6 is pushed by an operator or a pushing operation for rough positioning by an automatic mounting machine. First, 9 hits the edge of the recess 10a provided in the metal frame 11, and the bowl-shaped curved shape portion 9 serves as a guide and slides into the recess 10a along the bowl-shaped shape. The slid projection 6 is fixed to the metal frame by fitting the cylindrical portion 8 of the projection formed with high precision and the concave portion of the metal frame. In order to insert the projection 6 into the recess 10a accurately and reliably, the height of the projection 6 is 5 to 15 m.
It has a height of m. If the plate comes off when the pushing is released by only fitting, the mounting work can be carried out very easily by temporarily holding it by a not-shown pressing spring or magnet attached to the metal frame side. Next, in the removal work, the cylindrical portion 8
When the recesses 10a of the metal frame and the recesses 10a of the metal frame are fitted with high precision in all directions, only a pull-out movement is allowed. A gap of 1 to 10 mm is used as a play allowance, and the plate can be easily removed by prying the plate in a direction perpendicular to the sliding direction.

Embodiment 2 FIG. 5 shows an example in which the projections 6 are provided so as to be continuous with both side edges of the plate of the metal case 2 in a direction perpendicular to the relative sliding direction. In the case of the figure, the projection 6 has a rectangular tubular shape in plan view, and the length of the projection in the sliding direction is the plate width 2
The width was 60 mm, which was one-third or less of 10 mm, and the width of the protrusion was 20 mm. The protrusion has a plane portion 8 having a height of 3 mm on the surface intersecting with the sliding direction, and this plane portion receives the sliding force from the metal frame like the outer shape of the cylindrical portion of the first embodiment.
A bowl-shaped curved portion 9 is formed at the top corner portion of the protrusion 6 that follows the tubular portion 8. 3 and 4 of the first embodiment.
In the same manner as in the above description, the bowl-shaped curved shape portion 9 serves as a guide and slides into the concave portion formed in the metal frame along the bowl-shaped shape to facilitate the mounting. The recess of the metal frame corresponding to the protrusion 6 shown in FIG. 5 is about 0.3 mm between the protrusion 6 and the recess 10a in the sliding direction corresponding to FIG. 3 of the first embodiment. A fitting gap is formed,
In addition, in the same sliding direction as that of FIG.
The gap between the protrusion 6 and the recess 10b is formed to be 4 mm. As a result, as in the case of the first embodiment, the outer surface of the protrusion 6 and the recess 10b are formed in the direction perpendicular to the sliding direction.
The gap of 4 mm provided between the plate and the inner surface of the plate can be used as a play allowance, and the plate can be easily removed by prying it open in the direction perpendicular to the sliding direction.

[0020]

The present invention has the following effects.

(1) Since the fixing plate or the sliding plate for the sliding nozzle device can be easily attached to and detached from the fixed metal frame or the sliding metal frame by human means or mechanical means, cold and heat The plate replacement work can be easily performed at any of the intervals.

(2) Plate When manufacturing a plate in which a metal case is attached to a refractory, the manufacturing process is simplified.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG. 1 taken along line AA.

FIG. 3 is a view showing a fitting state of a protrusion of a metal case and a recess of a metal frame as seen from a direction perpendicular to a sliding direction.

FIG. 4 shows a view of FIG. 3 viewed from the sliding direction.

FIG. 5 shows a second embodiment of the present invention.

[Explanation of symbols]

 1 plate refractory 2 metal case 3 mortar for joint 4 molten metal passage hole 5 sliding surface 6 protrusion 7a protrusion for joint 7b return part of protrusion of metal case 8 cylindrical portion 9 bowl-shaped curved portion 10a concave portion of metal frame (sliding) Direction) 10b Recessed part of the metal frame (perpendicular to the sliding direction) 11 Metal frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Teruo Aoki, 1-1 Higashihama-cho, Hachimansai-ku, Kitakyushu-shi, Fukuoka Prefecture Kurosaki Ceramics Co., Ltd. Kurosaki Ceramics Co., Ltd.

Claims (3)

[Claims] 1. A plurality of protrusions are formed on the outer surface of the metal case on the back side of the sliding surface of the plate, and the plurality of protrusions are formed on the metal frame surface corresponding to the metal case of the plate corresponding to the metal case. A recess is provided so that the projection of the metal case and the recess of the metal frame can be fitted to each other, and the fitting gap between the projection of the metal case and the metal frame is set to 0. A structure for fixing a metal frame of a sliding nozzle plate, which is formed so as to have a thickness of 1 to 1.0 mm. 2. A plurality of projections are provided on the outer surface of the metal case on the back side of the sliding surface of the plate, and the outer diameter of the projections is 3 times the plate width.
It is formed in a cylindrical shape having a diameter of one-tenth or less or a rectangular tubular shape having a width length, and the height of the cylindrical portion or the rectangular tubular portion is 1 to 5 mm, and further, a curved top portion continuous to the cylindrical side surface is formed. The metal frame fixing structure for the sliding nozzle plate according to claim 1, which is formed. 3. A plurality of protrusions formed of a metal case are formed on the back side of the sliding surface of the plate so as to draw a gentle curved surface and smoothly connect to the horizontal surface of the bottom of the metal case, and the height of the return is made into a brick. The thickness of the joint material filled between the metal case and the metal case is made to match.
The structure for fixing the metal frame of the sliding nozzle plate described in.