JPH0560648U - Tundish cover opening / closing device - Google Patents

Abstract

(57) [Abstract] [Purpose] The long nozzle insertion hole formed in the tundish cover is closed except for the long nozzle fitting hole, and the effect of blocking the outside air is enhanced to prevent the oxidation of molten steel. [Configuration] Guide rails 5 are installed on both sides of a long nozzle insertion hole 2 of a tundish cover 1, and a pair of left and right heat resistant plates 6 and 7 are movably mounted. The heat-resistant plates 6 and 7 are formed with semi-circular cutouts 7 in the opposing portions, and when the heat-resistant plates 6 and 7 are closed, the long nozzle 9 can be fitted when the sliding nozzle is fully opened. Then, a skirt 10 made of a heat-resistant sheet such as asbestos hangs down on the tundish cover on the periphery other than the side where the notch 8 is formed, and closes the gap with the tundish cover 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an opening / closing device that opens and closes an opening of a tundish cover.

[0002]

[Prior art]

In the tundish of the continuous casting equipment, prior to receiving molten steel from the ladle, the heat resistant layer on the inner surface is preheated before casting, and in order to prevent oxidation of the injected molten steel, Ar, N ₂ gas, etc. An inert gas is purged to replace the internal air, the replaced gas is blocked from the outside air, and a tundish cover is usually provided to keep the injected molten steel warm. This tundish cover is generally provided with a hole for injecting an inert gas such as Ar or N ₂ gas, a gas burner insertion hole, a long nozzle insertion hole used when receiving molten steel from a ladle, Among them, the long nozzle insertion hole is formed as a relatively large hole so as to cope with the change in the molten steel discharge position from when the sliding nozzle starts to open to when the sliding nozzle fully opens, as shown in the illustrated embodiment. There is.

[0003]

[Problems to be solved by the device]

 The above-mentioned various holes formed in the tundish cover, particularly the large-sized long nozzle insertion hole, causes the replaced gas to diffuse and the outside air to enter, impairing the cutoff from the outside air. The present invention was made for the purpose of improving the effect of blocking the outside air and preventing the oxidation of molten steel.

[0004]

[Means for solving the problem]

 For this reason, the present invention has a sliding door-like or double-opening heat-resistant plate in which the long nozzle insertion hole is opened and closed on the tundish cover, and a fitting hole for fitting the long nozzle when the sliding nozzle is fully opened is formed when closed. The opening / closing device is provided. It is possible to provide an opening / closing device for opening / closing the holes other than the long nozzle insertion hole.

[0005]

[Action]

 With the sliding nozzle fully opened and the long nozzle stopped, the switchgear is closed and the insertion hole around the long nozzle is closed. The opening / closing of the opening / closing device is automatically performed by using power, or manually performed.

As described above, the opening / closing of the opening / closing device is performed in the sliding door shape or the double opening door shape, and it is preferable that the opening / closing device is opened / closed in the sliding door shape. This is because the tundish cover does not need a space for opening and closing. In this case, it is desirable to move the heat resistant plate along the guide rails arranged on both sides of the long nozzle insertion hole, and when there is a gap between the heat resistant plate and the tundish cover. It is desirable to attach a skirt made of a heat-resistant sheet such as asbestos to one side and both sides of the heat-resistant plate so that the above-mentioned gap is closed.

As a device for opening and closing the holes other than the long nozzle insertion hole, a single sliding door or a single opening door type opening and closing device can be adopted.

[0008]

【Example】

 In the tundish cover 1 shown in FIGS. 1 and 2, a long nozzle insertion hole 2 is formed in the center, and a gas burner insertion hole 3 and a gas purging hole 4 are formed on both sides of the long nozzle insertion hole 2. A pair of left and right heat resistant plates 6 and 7 are movably mounted on the guide rails 5 arranged on both sides of the long rail so that the long nozzle insertion hole 2 can be opened and closed like a sliding door. The heat-resistant plate 6 has a semi-circular cutout 8 formed in the opposing portion so that when the heat-resistant plates 6 and 7 are closed, they can be fitted into the long nozzle 9 when the sliding nozzle is fully opened. A skirt 10 made of a heat-resistant sheet such as asbestos is attached to the side edges of the side and both rails, and hangs down from the side end onto the tundish cover to close the gap with the tundish cover 1. .

FIG. 2 shows a state in which the heat resistant plates 6 and 7 are closed and the long nozzle insertion hole 2 around the long nozzle 9 is closed when the sliding nozzle is fully opened.

[0010]

[Effect of the device]

 The present invention is configured as described above and has the following effects. According to the opening / closing device of the first aspect, the long nozzle insertion hole, which is the largest opening formed in the tundish, has an improved effect of blocking the outside air and prevents the molten steel poured into the tundish from being oxidized. be able to.

According to the opening and closing device of the second aspect, all the openings formed in the tundish can be closed, and the oxidation prevention of molten steel can be further improved. If the skirt is provided so as to close the gap between the heat-resistant plate and the tundish cover as in the opening / closing device according to claim 3, the effect of blocking the outside air is further enhanced and it is useful for preventing the oxidation of the molten steel. it can.

[Brief description of drawings]

FIG. 1 is a plan view of a tundish cover according to the present invention, showing a state in which an opening / closing device is opened and a long nozzle insertion hole is released.

FIG. 2 is a view showing a state in which the long nozzle insertion hole is closed.

[Explanation of sign]

1 ... Tundish cover 2 ... Long nozzle insertion hole 3 ... Gas burner insertion hole 4 ... Gas purging hole 5 ... Guide rail 6, 7 ... Heat-resistant plate 8 ... Notch 9 ・ ・ ・ Long nozzle 10 ・ ・ Skirt

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mikiki Okada 11-1 Showa-cho, Kure-shi, Hiroshima Nisshin Steel Co., Ltd. Kure Steel Works (72) Shizuo Machino 11-11 Showa-cho, Kure-shi, Hiroshima Kure Works, a new steel company

Claims (3)

[Scope of utility model registration request] 1. A device for opening and closing a long nozzle insertion hole formed in a tundish cover, comprising a sliding door-shaped or double door-shaped heat-resistant plate, and a long nozzle fitted when the sliding nozzle is fully opened when fitted. An opening and closing device that has a fitting hole that fits. 2. The opening / closing device according to claim 1, further comprising an opening / closing device made of a heat-resistant plate for opening / closing openings other than the long nozzle insertion hole. 3. The heat-resistant plate is movably mounted on a guide rail provided in parallel with the tundish cover, and a skirt made of a heat-resistant sheet hanging from the side edge on the tundish cover is provided. The switchgear according to any one of claims.