JP4312948B2 - Immersion nozzle for continuous casting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an immersion nozzle for continuous casting (hereinafter simply referred to as an immersion nozzle).
[0002]
[Prior art]
The submerged nozzle has a reinforcing iron skin covering the outer periphery of the upper end of the nozzle body integrally formed with a flange-shaped head at the upper end to the side peripheral surface of the head, and the lower surface of the head is supported by a slide guide in a predetermined direction. It is moved horizontally to the bottom of the slide gate. And in order to shorten the time required for replacement as much as possible and improve the operation efficiency, the nozzle is supported by a series of operations in which a new immersion nozzle is supported by the slide guide and waits for horizontal movement in a certain direction. We are exchanging.
[0003]
[Problems to be solved by the invention]
However, when the immersion nozzle is continuously changed by horizontally moving in a predetermined direction, the molten steel remaining attached to the gate hole of the lower plate of the slide gate is discharged and the immersion nozzle head to be charged is inserted. In some cases, the steel particles flowed down between the reinforcing iron skins and solidified, so that the immersion nozzles could not be separated and could not be replaced.
The present invention has been made to solve the above-mentioned problems, and the molten steel remaining attached to the gate hole at the time of replacement of the immersion nozzle is between the reinforcing iron skin of the immersion nozzle to be discharged and the head of the immersion nozzle to be inserted. An object of the present invention is to provide an immersion nozzle that does not flow down.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, an immersion nozzle according to claim 1, wherein the outer periphery of the nozzle body integrally formed with a flange-shaped head at the upper end and the side peripheral surface of the head are covered with a reinforcing iron skin. An immersion nozzle for continuous casting in which the lower surface of the head is supported by a slide guide and horizontally moved in a predetermined direction, and is attached to the lower surface of the slide gate, the nozzle toward the horizontal movement direction of the upper surface of the head An inflow recess for molten steel that remains attached to the gate hole of the slide gate is formed at a position that is substantially behind the inner hole.
[0005]
Further, the immersion nozzle according to claim 2 is characterized in that, in the configuration according to claim 1, the shape of the inflow concave portion in plan view is formed so as to expand toward the rear side in the horizontal movement direction. And
[0006]
[Operation and effect of the invention]
According to the immersion nozzle of claim 1, when the lower surface of the head of the immersion nozzle is supported by the slide guide, horizontally moved in a predetermined direction and discharged from the lower surface of the slide gate, the molten steel remaining attached to the gate hole is Flows into an inflow recess formed at a position substantially behind the nozzle bore toward the discharge direction on the upper surface of the nozzle. Therefore, the molten steel that remains attached to the gate hole flows between the discharged immersion nozzle and the reinforcing iron skin of the inserted immersion nozzle head and solidifies, so that the immersion nozzles cannot be separated and can be replaced. The problem of disappearing can be solved.
[0007]
Moreover, according to the immersion nozzle of Claim 2, since the planar view shape of the inflow recessed part was formed in the shape which spreads toward the rear side of a horizontal movement direction, the molten steel at the time of discharge | emission of an immersion nozzle spreads over the whole inflow recessed part. Therefore, the molten steel does not swell from the upper surface of the head and rub against the lower surface of the slide gate. Moreover, if it is set as the shape which imitates the arrow as a shape which spreads toward the back side of a horizontal movement direction, the discharge | emission and charging direction of an immersion nozzle can be confirmed visually.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of an immersion nozzle 1 according to the present embodiment, and FIG. 2 is a partially cutaway perspective view of a head 5. The immersion nozzle 1 is
A nozzle inner hole 3 is formed in 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-like head 5 having a substantially square or substantially rectangular shape in plan view is integrally formed. On the upper surface 5 a of the head 5, an inflow concave portion having an arrow shape in plan view with the 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. 6 is formed. When the inflow recess 6 is horizontally moved and discharged to replace the immersion nozzle 1, the molten steel S adhering to the gate hole 13 b of the lower plate 13 a of the slide gate 13 flows in.
[0009]
The nozzle body 2 is covered with a reinforcing iron skin 7 from the outer periphery of the upper end portion to the side peripheral surface 5 b 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 iron skin 7. The lower end 7a of the reinforcing iron skin 7 and the outer periphery of the nozzle body 2 are hermetically sealed. Further, a connecting rod 8 for connecting a gas pipe for blowing an inert gas into the gap G is attached to the reinforcing iron skin 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 iron skin 7, and the gas guide grooves 9 are formed on the side peripheral surface 5b. A plurality of gas guide grooves 10 in the vertical direction that are continuous with each other are formed in parallel. Further, a groove 11 surrounding the upper surface peripheral edge portion 5d is formed between the upper surface peripheral edge portion 5d of the head 5 and the reinforcing iron skin 7, and communicated with the vertical gas guide groove 10.
[0010]
As shown in FIG. 4, the immersion nozzle 1 horizontally moves on a pair of slide guides 12 that support the lower surface of the head 5 to below the slide gate 13, and the upper surface of the head 5 is lowered by the push-up arm 14. It is mounted in close contact with the lower surface of the plate 13. Then, a gas pipe (not shown) is connected to a connecting rod 8 attached to the reinforcing iron skin 7, and an argon gas as an inert gas is passed through the gap G between the outer periphery of the upper end of the nozzle body 2 and the inner surface of the reinforcing iron skin 7. Infuse.
[0011]
The blown argon gas passes through a plurality of gas guide grooves 9 formed on the lower surface 5 b of the head 5 and a plurality of gas guide grooves 10 continuing to the gas guide grooves 9, and then from a groove 11 surrounding the upper peripheral edge portion 5 d. Argon gas is blown out over the entire upper surface periphery 5d. When the slide gate 13 opens 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. , Can surely prevent atmospheric inhalation.
[0012]
Further, as shown in FIG. 5, the immersion nozzle 1 is supported by the lower surface 5b of the head 5 of the new immersion nozzle 1 by the slide guide 12 to stand by, and a series of operations for horizontally moving discharge and charging in a certain direction. The nozzle is being replaced. In order to replace the nozzle, 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 remaining in the gate hole 13b of the lower plate 13a of the slide gate 13 is discharged from the lower surface of the slide gate 13. Flows into the inflow recess 6 formed in the upper surface 5a of the head 5 of the immersion nozzle 1 (see FIG. 6).
[0013]
Accordingly, the molten steel S remaining in the gate hole 13a flows between the discharged immersion nozzle 1 and the reinforcing iron skin 7 of the head 5 of the immersion nozzle 1 to be solidified, and the immersion nozzles 1 are not separated from each other. The inconvenience that it becomes possible and cannot be replaced can be solved. Moreover, since the planar view shape of the inflow recessed part 6 was formed in the arrow shape which spreads toward the rear side of a horizontal movement direction, the molten steel which flows in at the time of discharge | emission of the immersion nozzle 1 spreads over the whole inflow recessed part 6. Therefore, the molten steel that flows in does not rise from the upper surface 5a of the head 5 and rub against the lower surface of the lower plate 13a. Furthermore, since the plan view shape of the inflow recess 6 is an arrow that spreads toward the rear side in the horizontal movement direction, the discharge and insertion 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 mounting state of the immersion nozzle.
FIG. 5 is an explanatory view showing a standby state of the immersion nozzle at the time of replacement.
FIG. 6 is an explanatory view showing an inflow state of molten steel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Immersion nozzle 2 ... Nozzle body 3 ... Nozzle inner hole 5 ... Head 5a ... Upper surface 6 ... Inflow recessed part 7 ... Reinforcement iron skin 12 ... Slide guide 13. ..Slide gate 13a ... Lower plate 13b ... Gate hole S ... Molten steel

Claims (2)

The outer periphery of the upper end of the nozzle body, which is integrally molded with a flange-shaped head at the upper end, is covered with a reinforcing iron skin, and the lower surface of the head is supported by a slide guide and moved horizontally in a predetermined direction. An immersion nozzle for continuous casting that is attached to the lower surface of the slide gate,
A continuous casting dipping characterized in that an inflow recess for molten steel that remains attached to the gate hole of the slide gate is formed at a position on the upper surface of the head substantially behind the nozzle inner hole in the horizontal movement direction. nozzle. 2. The continuous casting immersion nozzle according to claim 1, wherein a shape of the inflow recess in a plan view is formed so as to expand toward a rear side in the horizontal movement direction.

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