JPH0819856A - Heat insulating device for nozzle for molten metal - Google Patents

Abstract

PURPOSE:To simplify a device without requiring a burner by sucking the high temp. preheating gas in a vessel for molten metal from the lower part of a nozzle and preheating the nozzle in the state or newly mounting this nozzle in the tap hole of this vessel for the metal. CONSTITUTION:This heat insulating device 5 is installed on a truck 5 moving or rails and has a horn-shaped guiding hood 7 enclosing the circumference of the nozzle 5, a suction device 8 installed integrally below this guiding hood and a positioning mechanism 9 for positioning the guide hood 7 of this suction device 8 at the bottom end of the nozzle 4. The device is composed of a lifting cylinder 10 which attaches and detaches this positioning mechanism 9 to and from the nozzle 4 by vertically moving the mechanism 9 and an air introducing device 11 for inducing an ejector effect by introducing high-pressure air into the suction device 8. As a result, the device is simplified and peeling of a coating material for preventing oxidation applied on the nozzle 4 and variation in heating temp. by the position in the vertical direction of the nozzle are eliminated and the heating up effect with good balance even among different kinds of steels is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining device for a molten metal nozzle, and more specifically, when replacing a nozzle installed at a tap hole of a molten metal container with a new nozzle,
The present invention relates to a heat retaining device for a molten metal nozzle, in which a new nozzle to be replaced is preheated by utilizing residual heat of a molten metal container to simplify the preheating device and improve the economical effect.

[0002]

2. Description of the Related Art Generally, in a continuous casting process in a steelmaking method, a molten metal outlet is provided at the bottom of a molten metal container, and this molten steel outlet controls the amount of molten metal tapped. The casting slide gate plate and nozzle are installed.

The structure of the molten metal container is, for example, as shown in FIG. 4, in which a lining brick 31 is attached to the inside of the container body 30, and in the vicinity of the tap hole 32 through which molten metal is tapped. Brick 33 is installed. Then, the upper nozzle 34 is assembled in the mounting hole formed in the brick 33, and the nozzle 36 is installed below the upper nozzle 34 via the casting slide gate plate 35 for controlling the molten steel output. Has been done.

Conventionally, the nozzle installed at the tap hole of the molten metal container is replaced with a new nozzle immediately after the completion of all the pouring in the casting process. After the nozzle was attached to the tap hole of the container through the joint material, the nozzle was heated and kept warm by several burners.

[0005]

However, in the conventional heat retaining device, a large amount of gas or oil that is the fuel of the burner is required, the combustion noise of the burner is large, and piping equipment for supplying the fuel is required. Therefore, there was a problem that the device was large and the economic efficiency was low.

Further, in the method of heating with a burner after attaching the nozzle to the tap hole of the molten metal container, since the pressure inside the molten metal container is higher, the temperature near the root of the nozzle does not rise properly. The thermal efficiency is low, and the anti-oxidant coating material on the nozzle is easy to peel off,
There is a problem that the heating temperature varies depending on the vertical position of the nozzle.

Further, when attaching and detaching the nozzle to and from the tapping port of the molten metal container, since it is almost done by hand, it is difficult to attach and detach the nozzle and position the burner, which causes thermal strain between different steel types. In addition to being unable to deal with the problem, there was a problem that the work efficiency decreased due to heavy work in a high temperature atmosphere and the risk was extremely high.

The present invention has been made in order to solve these problems, and when a new nozzle to be replaced is attached to the tap hole of the molten metal container, a high temperature inside the molten metal container is applied from below the nozzle. An object of the present invention is to provide a heat retaining device for a molten metal nozzle, which simplifies the nozzle preheating device by sucking residual heat gas to preheat the nozzle.

[0009]

In order to achieve such an object, a heat insulation device for a molten metal nozzle according to the present invention is installed in a carriage moving on a rail and has a horn shape surrounding the nozzle. A guide hood, a suction device that is integrally installed below the guide hood, a positioning mechanism that positions the guide hood of the suction device at the lower end of the nozzle, and a lifting mechanism that moves the positioning mechanism up and down to attach / detach to / from the nozzle. It is composed of a cylinder and an air introducing device which introduces high-pressure air into the suction device to cause an ejector effect. The positioning device of the heat retaining device includes a base fixed to the upper end of the lifting cylinder, an intermediate slider mounted on the upper surface of the base so as to be horizontally movable in the X direction, and a Y direction on the upper surface of the intermediate slider. A suction device having a guide hood is fixed to the upper surface of the upper slider, and the base of the positioning device and the intermediate slider are two parallel to each other in the X direction. Supported via the X-axis of, and the coil spring mounted between the bearing on the upper surface of the base and the bearing on the lower surface of the intermediate slider balances the movement in the X direction.
Set the middle slider and the upper slider to 2 parallel to the Y direction.
It is supported via the Y-axis of the book, and the movement in the Y direction is balanced by a coil spring mounted between the bearing provided on the upper surface of the intermediate slider and orthogonal to the bearing on the lower surface and the bearing on the lower surface of the upper slider. is there.

[0010]

According to the present invention, based on the above-described structure, the nozzle is preheated with a new nozzle to be replaced attached to the tap hole of the molten metal container. When it is set below and stopped, the lifting cylinder rises and the guide hood surrounds the nozzle, and the positioning device operates to move in the X direction and Y direction.
Correct the position in the direction, and keep the area around the lower end of the tap hole of the nozzle closed.

Then, high-pressure air is jetted from the jet nozzle introduced into the suction device to cause an ejector effect in the suction device, and the high-temperature residual heat gas in the molten metal container is sucked to form the tapped hole of the nozzle. Preheat nozzle while discharging through.

Therefore, the conventional burner is not required, the equipment and devices such as fuel and fuel piping are not required, the device is simplified and the cost can be greatly reduced, and the nozzle can be attached and detached. There is no heavy work in a high-temperature atmosphere for preheating the nozzle, the risk is low, and the work efficiency can be improved.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing a heat retaining device for a molten metal nozzle according to the present invention before heat retaining work, and FIG. 2 is an explanatory view showing a main part of a heat retaining work state by the heat retaining device for a molten metal nozzle.

In the figure, a nozzle is installed in the tap hole 2 of the molten metal container 1 through a slide gate plate 3 for casting, and is replaced with a new nozzle 4 immediately after the completion of all the pouring in the casting process. There is. The new nozzle 4 is positioned and attached by handling such as a robot (not shown).

The heat retaining device 5 for the nozzle 4 is installed on a carriage 6 which moves on a rail, and is integrally installed below the guide hood 7 and a horn-shaped guide hood 7 surrounding the nozzle 4. Suction device 8, a positioning device 9 for positioning the guide hood 7 of the suction device 8 at the lower end of the nozzle 4, an elevating cylinder 10 for moving the positioning device 9 up and down to attach / detach to / from the nozzle 4, and a suction device 8 And an air introducing device 11 that introduces high-pressure air to cause an ejector effect.

The upper end of the guide hood 7 is opened like a horn, and the periphery of the nozzle 4 is surrounded to seal the periphery of the lower end of the tapped hole of the nozzle 4 and is introduced into the suction device 8. Due to the ejector effect of the high-pressure air, the high-temperature residual heat gas in the molten metal container 1 is discharged through the tap hole of the nozzle 4.

The positioning device 9 includes a base 12 fixed to the upper end of the lifting cylinder 10, an intermediate slider 13 mounted on the upper surface of the base 12 so as to be horizontally movable in the X direction, and an upper surface of the intermediate slider 13. And an upper slider 14 mounted horizontally movable in the Y direction, and a suction device 8 having a guide hood 7 is fixed to the upper surface of the upper slider 14.

The base 12 and the intermediate slider 13 of the positioning device 9 have two X axes 15 and 15 parallel to the X direction.
The coil springs 16 and 16 mounted between the upper surface bearing of the base 12 and the lower surface bearing of the intermediate slider 13 are balanced so as to be movable in the X direction.

The intermediate slider 13 and the upper slider 14 are supported via two Y-axes 17, 17 which are parallel to the Y direction, and are provided on the upper surface of the intermediate slider 13 orthogonally to the bearings on the lower surface. The coil springs 18 mounted between the upper bearing and the lower bearing of the upper slider 14 are balanced so as to be movable in the Y direction.

In the air introduction device 11, high-pressure air generated by a compressor (not shown) is stored in a high-pressure tank, and the high-pressure air is injected from an injection nozzle 19 inserted inside the suction device 8 through a control valve. Thus, the ejector effect is produced in the suction device 8.

In the above construction, when preheating and heat retention of the molten metal nozzle, first, a new nozzle 4 is installed in the tap hole 2 of the molten metal container 1 via the casting slide gate plate 3. The carriage 6 mounted on the rail under the nozzle 4 and equipped with the heat insulation device 5 is installed at a predetermined position and stopped.

Next, when the heat retaining device 5 is stopped, the elevating cylinder 10 is raised, the guide hood 7 surrounds the periphery of the nozzle 4, and the positioning device 9 is activated to move the X axis.
Direction adjustment and Y-direction position correction are performed to maintain the bottom end of the tap hole of the nozzle 4 in a sealed state.

Then, high-pressure air is jetted from the jet nozzle 19 introduced into the suction device 8 to generate an ejector effect in the suction device 8 and suck the high temperature residual heat gas in the molten metal container 1 to jet the nozzle 4 Nozzle 4 is preheated and kept warm because it is discharged through the tapped hole.

When the preheating and heat retention of the nozzle 4 is completed, the elevating cylinder 10 of the heat retention device 5 descends and moves away from the nozzle 4, and the positioning device 9 returns to its original position via the coil springs 16 and 18 and the molten metal container 1 Away from below.

FIG. 3 shows experimental results when the nozzle 4 is preheated and kept warm by using the warming apparatus 5 according to the present invention. As is clear from the results of this experiment, when preheated by the suction method, it is possible to heat the entire nozzle to 1000 degrees Celsius or higher in about 80 minutes. Further, when the preheating time is compared with 120 minutes, the heating temperature can be improved by 100 to 200 degrees, and the temperature difference between the upper part and the lower part of the nozzle is small, and a well-balanced temperature rising effect can be expected.

[0027]

As described above in detail, according to the heat insulation device for a molten metal nozzle according to the present invention, a new nozzle to be replaced is melted from below the nozzle in a state where it is attached to the tap hole of the molten metal container. Since the nozzle is preheated by sucking the high-temperature residual heat gas in the metal container, the conventional burner is not required, and the equipment and devices such as fuel and fuel piping are not required, and the device is simplified. Significant cost reduction is possible.

Further, the anti-oxidizing coating material applied to the nozzles is eliminated and variations in heating temperature due to the vertical position of the nozzles are eliminated, and a well-balanced temperature raising effect can be obtained between different steel types.

Further, since heavy work in a high temperature atmosphere such as attaching and detaching the nozzle to the tap hole of the molten metal container or preheating the nozzle is almost automated, the work is easy and the risk is low. It is possible to improve work efficiency.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a heat retaining device for a molten metal nozzle according to the present invention before a heat retaining operation.

FIG. 2 is an explanatory diagram showing a main part of a molten metal nozzle during a heat retaining operation by a heat retaining device.

[Fig. 3] Preheating of nozzles by using the heat insulating device according to the present invention
It shows the experimental results when heat insulation is performed.

FIG. 4 is a cross-sectional view showing the structure of a general molten metal container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal container 2 Steel tap 4 Nozzle 5 Heat retention device 6 Cart 7 Guide hood 8 Suction device 9 Positioning device 10 Lifting cylinder 11 Air introduction device 12 Base 13 Intermediate slider 14 Upper slider 15 X-axis 17 Y-axis 16, 18 Coil spring 19 injection nozzles

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Sato No. 1 Minamito, Ogakie-cho, Kariya city, Aichi Toshiba Ceramics Co., Ltd. Kariya factory (72) Inventor Shinichiro Iura No. 1 Nanto, Ogakie-cho, Kariya city, Aichi prefecture Lamix Co., Ltd. Kariya Plant (72) Kenichi Tsujimoto, 1st Nanto, Ogakie-cho, Kariya City, Aichi Prefecture Toshiba Ceramix Co. Ltd., Kariya Plant, Shogo Mizutani, 1st Nanto, Ogakie-cho, Kariya City, Aichi Prefecture Lamix Co., Ltd. Kariya Plant (72) Kenzo Hayashi, 1st Nanto, Ogakie-cho, Kariya, Aichi Prefecture, Toshiba Ceramix Co., Ltd. Kariya Plant, Toshio Kawamura, 1st Nanto, Ogakie-cho, Kariya City, Aichi Prefecture Lamix Co., Ltd. Kariya Plant (72) Inventor Satoshi Kawato 1850 Minato Minato, Wakayama Prefecture Wakayama Steel Works, Sumitomo Metal Industries, Ltd. (72) Inventor Takeshi Okada 4-53, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd.

Claims (3)

[Claims] 1. A device for keeping a temperature of a new nozzle, which is attached to the molten metal container by replacing it with a tap hole, wherein the device is installed on a carriage moving on a rail and has a horn-shaped guide surrounding the nozzle. A hood, a suction device that is integrally installed below the guide hood, a positioning mechanism that positions the guide hood of the suction device at the lower end of the nozzle, and an elevating cylinder that moves the positioning mechanism up and down and attaches to and detaches from the nozzle. And a heat retaining device for a molten metal nozzle, which is configured by an air introducing device that introduces high-pressure air into the suction device to cause an ejector effect. 2. The positioning device of the heat retaining device comprises a base fixed to an upper end of a lifting cylinder, an intermediate slider mounted on the upper surface of the base so as to be horizontally movable in the X direction, and an upper surface of the intermediate slider. 2. The heat retaining device for a molten metal nozzle according to claim 1, further comprising an upper slider mounted horizontally movable in the Y direction, and a suction device having a guide hood is fixed to an upper surface of the upper slider. 3. A base of the positioning device and an intermediate slider are supported via two X axes parallel to the X direction, and are mounted between a bearing on an upper surface of the base and a bearing on a lower surface of the intermediate slider. A bearing provided on the upper surface of the intermediate slider orthogonal to the bearing on the lower surface while balancing the movement in the X direction by the coil spring and supporting the intermediate slider and the upper slider via two Y axes parallel to the Y direction. 3. The heat insulation device for a molten metal nozzle according to claim 1, wherein the movement in the Y direction is balanced by a coil spring mounted between the lower slider and the bearing on the lower surface of the upper slider.