JP2002153950A - Immersion nozzle for continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an immersion nozzle with which remaining molten steel to a gate hole is not made to flow out from a gap between an ejected immersion nozzle and a reinforced iron shell of a fitting immersion nozzle head. SOLUTION: A nozzle exchange is performed at one series of movement, in which the lower surface 5b of the head 5 of the new immersion nozzle 1, is supported with a slide guide 12 and waited and the eject and the fit are horizontally moved in the fixed direction. The nozzle exchange is performed by lowering a push-up arm 14 after closing a slide gate nozzle 13, and supporting the immersion nozzle 1 on the slide gate 12. Then, the ejected immersion nozzle 1 and the fitted immersion nozzle 1 are simultaneously and horizontally moved and so, the remaining molten steel stuck on the gate hole 13b in a lower plate 13a of the slide gate 13, is made to flow into a flowing recessed part 6 formed on the upper surface 5a of the head 5 in the ejected immersion nozzle 1 from the lower surface of the slide gate 13. The remaining molten steel is not made to flow down between the ejected immersion nozzle 1 and the reinforced iron shell 7 of the head 5 in the inserting immersion nozzle 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion nozzle for continuous casting (hereinafter simply referred to as an immersion nozzle).

[0002]

2. Description of the Related Art An immersion nozzle covers an outer periphery of an upper end portion of a nozzle body integrally formed with a flange-shaped head at an upper end to a side peripheral surface of the head with a reinforcing iron skin, and a lower surface of the head is covered by a slide guide. It is supported and horizontally moved in a predetermined direction to be mounted on the lower surface of the slide gate. Then, in order to shorten the time required for replacement as much as possible and to increase the operation efficiency, a new immersion nozzle is supported by the slide guide to stand by, and a series of operations for horizontally moving discharge and charging in a certain direction are performed. Exchange is taking place.

[0003]

However, if the immersion nozzle is continuously replaced by being horizontally moved in a predetermined direction, the molten steel adhering to the gate hole of the lower plate of the slide gate is discharged. In some cases, the immersion nozzles flow down and solidify between the reinforcing iron skins of the heads of the immersion nozzles, so that the immersion nozzles cannot be separated from each other and cannot be replaced. The present invention has been made in order to solve the above-mentioned problems. Molten steel adhered to a gate hole at the time of replacement of an immersion nozzle is removed between a immersion nozzle to be discharged and a reinforcing steel bar of a head of an immersion nozzle to be charged. It is an object of the present invention to provide an immersion nozzle that is prevented from flowing down.

[0004]

According to a first aspect of the present invention, there is provided an immersion nozzle, comprising: a nozzle body having a flange-shaped head integrally formed at an upper end thereof; Up to the reinforcing steel skin,
A continuous casting immersion nozzle in which the lower surface of the head is horizontally moved in a predetermined direction by being supported by a slide guide, and is mounted on the lower surface of a slide gate. An inflow concave portion of the molten steel that adheres to the gate hole of the slide gate and is formed at a position substantially right behind the hole.

According to a second aspect of the present invention, in the immersion nozzle according to the first aspect, the shape of the inflow concave portion in plan view is formed to be wider toward the rear side in the horizontal movement direction. It is characterized by the following.

[0006]

According to the immersion nozzle of the first aspect, when the lower surface of the head of the immersion nozzle is supported by the slide guide and horizontally moved in a predetermined direction to be discharged from the lower surface of the slide gate, the head adheres to the gate hole. The remaining molten steel
It flows into an inflow recess formed at a position on the upper surface of the head substantially directly behind the nozzle inner hole in the discharge direction. Therefore, the molten steel adhering to the gate hole flows down between the immersion nozzle to be discharged and the reinforcing steel skin of the head of the immersion nozzle to be charged and solidifies, so that the immersion nozzles cannot be separated and can be replaced. The inconvenience that disappears can be eliminated.

Further, according to the immersion nozzle according to the second aspect, the planar shape of the inflow recess is formed so as to widen toward the rear side in the horizontal movement direction. Since the molten steel spreads over the entire surface, the molten steel does not rise from the upper surface of the head and rub against the lower surface of the slide gate. Further, if the shape spreading toward the rear side in the horizontal movement direction is a shape imitating an arrow, the discharge and charging directions of the immersion nozzle can be visually checked.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an immersion nozzle 1 according to this embodiment.
FIG. 2 is a partially cutaway perspective view of the head 5. The immersion nozzle 1 has a nozzle inner hole 3 formed at the center of the nozzle body 2, and molten steel discharge holes 4, 4 communicating with the nozzle inner hole 3 are formed on the left and right sides of the lower end side. At the upper end of the nozzle body 2, a flange-shaped head 5 having a substantially square or substantially rectangular shape in plan view is integrally formed. Head 5
The upper surface 5a has an inflow recess 6 having an arrow shape in a plan view and having a tip directed toward the center of the nozzle inner hole 3 at a position substantially behind the nozzle inner hole 3 in the horizontal movement direction of the immersion nozzle 1 described later. Is formed. When the immersion nozzle 1 is replaced by being horizontally moved and discharged to replace the immersion nozzle 1, the inflow recess 6 allows molten steel S remaining in the gate hole 13 b of the lower plate 13 a of the slide gate 13 to flow therein.

The nozzle body 2 is covered with a reinforcing steel 7 from the outer periphery of the upper end to the side peripheral surface 5b of the head 5. A gap G is provided between the outer periphery of the upper end portion of the nozzle body 2 and the inner surface of the reinforcing steel shell 7. The lower end 7a of the reinforcing steel shell 7 and the outer periphery of the nozzle body 2 are hermetically sealed.
Further, a connecting beak 8 for connecting a gas pipe for blowing an inert gas into the gap G is attached to the reinforcing steel shell 7. As shown in FIGS. 2 and 3, a plurality of lateral gas guide grooves 9 are formed in parallel on the lower surface 5c of the head 5 covered with the reinforcing steel shell 7, and the gas guide grooves 9 are formed on the side peripheral surface 5b. Are formed in parallel with each other.
Further, a groove 11 surrounding the upper peripheral edge 5d is formed between the upper peripheral edge 5d of the head 5 and the reinforcing steel shell 7 so as to communicate with the vertical gas guide groove 10.

The immersion nozzle 1 is horizontally moved below a slide gate 13 on a pair of slide guides 12 supporting the lower surface of the head 5 as shown in FIG. 13
The lower plate 13 is mounted in close contact with the lower surface of the lower plate 13. Then, a gas pipe (not shown) is connected to a connection beak 8 attached to the reinforcing steel shell 7, and argon gas, which is an inert gas, is supplied to the gap G between the outer periphery of the upper end portion of the nozzle body 2 and the inner surface of the reinforcing steel shell 7. Blow into

The blown argon gas passes through a plurality of gas guide grooves 9 formed on the lower surface 5b of the head 5 and a plurality of gas guide grooves 10 continuous with the gas guide grooves 9, and surrounds the upper peripheral portion 5d. Argon gas is blown out from the groove 11 to the entire upper surface peripheral portion 5d. When the slide gate 13 is opened and the molten steel flows down and the upper peripheral edge of the nozzle inner hole 3 is depressurized, the argon gas blown to the upper peripheral edge 5d of the head 5 is sucked from between the upper surface 5a and the lower plate 13a. In addition, the suction of the atmosphere can be reliably prevented.

The immersion nozzle 1 is, as shown in FIG.
The lower surface 5b of the head 5 of the new immersion nozzle 1 is supported by the slide guide 12 to stand by, and nozzle replacement is performed by a series of operations for horizontally moving discharge and charging in a certain direction. For nozzle replacement, after the slide gate 13 is closed, the push-up arm 14 is lowered to support the immersion nozzle 1 on the slide guide 12. When the immersion nozzle 1 to be discharged and the immersion nozzle 1 to be charged are horizontally moved, the molten steel S attached to the gate hole 13 b of the lower plate 13 a of the slide gate 13
Upper surface 5 of head 5 of immersion nozzle 1 discharged from the lower surface of
It flows into the inflow recessed part 6 formed in (a) (see FIG. 6).

Therefore, the molten steel S adhered to the gate hole 13a flows down between the immersion nozzle 1 to be discharged and the reinforcing steel 7 of the head 5 of the immersion nozzle 1 to be charged and solidifies. However, it is possible to eliminate the inconvenience that the separation becomes impossible and the replacement becomes impossible. Further, since the shape of the inflow concave portion 6 in a plan view is formed as an arrow extending toward the rear side in the horizontal movement direction, molten steel flowing in when the immersion nozzle 1 is discharged spreads over the entire inflow concave portion 6. Therefore, the flowing molten steel does not rise from the upper surface 5a of the head 5 and rub against the lower surface of the lower plate 13a. Further, since the shape of the inflow recess 6 in plan view is an arrow expanding toward the rear side in the horizontal movement direction, the discharge and charging directions of the immersion nozzle 1 can be visually confirmed.

[Brief description of the drawings]

FIG. 1 is a front view of an immersion nozzle.

FIG. 2 is a partially cutaway perspective view of a head.

FIG. 3 is an enlarged sectional view of a head.

FIG. 4 is a cross-sectional view of a main part showing a mounted state of an immersion nozzle.

FIG. 5 is an explanatory diagram showing a standby state of the immersion nozzle at the time of replacement.

FIG. 6 is an explanatory diagram showing a flow state of molten steel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Immersion nozzle 2 ... Nozzle main body 3 ... Nozzle bore 5 ... Head 5a ... Top surface 6 ... Inflow recess 7 ... Reinforcement steel 12 ... Slide guide 13. ..Slide gate 13a ... Lower plate 13b ... Gate hole S ... Molten steel

Claims (2)

[Claims] An outer periphery of an upper end portion of a nozzle body integrally formed with a flange-like head at an upper end thereof to a side peripheral surface of the head is covered with a reinforcing steel, and a lower surface of the head is supported by a slide guide to be fixed. A continuous casting immersion nozzle which is horizontally moved in the direction, and which is mounted on the lower surface of the slide gate, wherein the slide gate is located at a position on the upper surface of the head substantially directly behind the nozzle inner hole in the horizontal movement direction. A continuous casting immersion nozzle characterized in that a recessed portion of molten steel that adheres to the gate hole is formed. 2. The immersion nozzle for continuous casting according to claim 1, wherein the shape of the inflow recess in plan view is formed so as to expand toward the rear side in the horizontal movement direction.