JPH0957427A - Sliding nozzle device for molten metal vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost by saving the consumption of a sliding plate used for a sliding nozzle device arranged at the lower part of a molten metal vessel. SOLUTION: An upper plate 5 and a lower plate 6 are divided into two pieces of nozzle hole side plates 13, 15 and non-nozzle hole side plates 14, 15 respectively and the projecting part and recessing part arranged on two divided surfaces respectively are fitted without the difference in level. Both divided parts are fixed by springs 23 and a plate fixing bolts so as not to cause joint opening part between both parts. By this constitution, only one side plate developing remarkable damage out of two divided nozzle hole side plates 13, 15 and non-nozzle hole side plates 14, 16 is changed and the other side plates are used to save the consumption of the plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal container, for example, a sliding nozzle device for a molten metal container suitable for controlling an outflow amount of molten steel such as a molten steel ladle containing a molten steel or a tundish.

[0002]

2. Description of the Related Art In continuous casting, molten steel is poured into a tundish by using a sliding nozzle device provided at the bottom of a molten steel ladle, and further controlled by a sliding nozzle device provided at the bottom of the tundish. Is being cast. In the case of a two-layer type sliding nozzle device used for a molten metal container such as a ladle or a tundish, as shown in FIG. 5, a sliding refractory 3 constructed on the upper surface of an iron shell 2 constituting the molten metal container 1 is used. An upper nozzle 4 is provided, and a fixed side upper plate 5 is provided so as to be connected to a lower portion of the upper nozzle 4, and the upper plate 5 is further provided.
The lower plate 6 on the sliding side is arranged so as to be slidable in the horizontal direction by contacting the lower surface of the.

The molten metal 7 accumulated in the molten metal container 1 is slid on the lower plate 6 with respect to the upper plate 5, and the nozzles provided on the lower plate 6 are located at the nozzle holes 5A provided on the upper plate 5. This is done by moving the hole 6A. At this time, by adjusting the overlap between the nozzle hole 5A and the nozzle hole 6A, the amount of molten metal injected through the upper nozzle 4 provided in the molten metal container 1 is controlled, and when the two match, the injection amount is It will be the maximum. When the injection of the molten metal 7 is stopped, the lower plate 6 is slid in the nozzle-free portion with respect to the nozzle hole 5A provided in the upper plate 5.

In the sliding nozzle device, a refractory material is used in a portion which is directly exposed to the molten metal 7 such as molten steel.
Both the upper plate 5 and the lower plate 6 are made of refractory material. As shown in FIG. 6, a constant pressure is applied to the mating surfaces of the refractory upper plate 5 and the lower plate 6 from above and below in order to prevent leakage of molten metal 7 such as molten steel.

As means for applying pressure to the mating surface of the upper plate and the lower plate of the sliding nozzle device,
The nut holding the spring is tightened by tightening the torque notch, or the lever link mechanism applies pressure via the spring. Further, a means for pressing a fixed pressure from the lower part of the plate by a pressing machine and the like are known. Further, Japanese Utility Model Laid-Open No. 55-103058 discloses a sliding nozzle device including a pressurizing device for an upper plate 5 and a lower plate 6 as shown in FIG. In FIG. 8, the lower plate 6 on the sliding side is opened and closed using the drive cylinder 8 with respect to the upper plate 5 on the fixed side arranged at the bottom of the molten metal container 1. A lower metal frame 11 is disposed below a support plate 9 that slidably supports the lower plate 6 via a plurality of springs 10.

One end of the lower metal frame 11 is rotatably supported by a bearing 30 attached to the lower surface of the iron shell 2 via a pin 31. Further, in the working cylinder 32 attached to the iron skin of the molten metal container 1, the push-up member 34 supports the other end of the lower metal frame 11 via the two lever link mechanisms 33. Therefore, when the operating cylinder 32 is operated and the push-up member 34 is rotated via the lever link mechanism 33 with the pin 35 as the fulcrum, the push-up member 34 pushes up the other end of the lower metal frame 11. With this, a certain amount of pressure can be applied to the mating surface of the lower plate 6 and the upper plate 5 via the spring 10 by the lever action of the lower metal frame 11 with the pin 31 as a fulcrum.

By the way, the upper plate 5 and the lower plate 6 made of refractory are rapidly worn while being in direct contact with the molten metal at high temperature, so that the wear is remarkable and it is necessary to replace them in a short time. Since it increases, it is a big problem. Upper plate 5 and lower plate 6
Is limited by the use of each plate 5,
6 is the wear due to the surface roughness and cracks that are generated in a certain amount in the plate sliding direction for each charge due to the enlargement of the hole diameter due to the melting damage of the nozzle holes 5A and 6A and the sliding of the plate mating surface.

Conventionally, when melting damage of nozzle holes, surface roughening or cracks of plates occur in the upper nozzle and the lower nozzle provided in the sliding nozzle device, it does not hinder the control of the molten metal injection amount. In addition, it is necessary to replace the entire upper plate and the lower plate as soon as possible, which causes an increase in cost per unit plate unit. Although various proposals have been made such as selecting and improving the plate material as a technology for extending the life of the upper plate and the lower plate of the sliding nozzle device, they do not lead to a significant extension of the life and the cost of the plate refractory It is a major cause of hindering down.

[0009]

As described above, the lifespan of the upper plate and the lower plate of the sliding nozzle device is limited by the melting loss of the nozzle holes locally generated in the upper plate and the lower plate. Rough surface of the plate,
It is a crack. By the way, of the upper plate and the lower plate, the plate length actually required for controlling the flow rate of the molten metal is as shown in FIGS. 7 (A) and 7 (B).
As for the above, only the length in consideration of the melting loss of the nozzle hole 5A and the length of the surface roughness due to the slide are considered. Similarly, with respect to the lower plate 6, it is sufficient if the nozzle holes 5A and 6A can be fully opened and fully closed in consideration of the melt damage of the nozzle holes 6A and the length of the surface roughness. Therefore, in particular, the length of the upper plate 5 should be able to be made significantly shorter than the length of the lower plate 6.

However, when this is used as it is as the length shape of the upper plate 5 and the lower plate 6, as described above, the lower plate 6 has a sliding length for fully opening-closing the nozzle hole 5A of the upper plate 5. Since a certain amount is required, only the lower plate 6 has to be made longer than the upper plate 5. However, since pressure is applied to the upper plate 5 and the lower plate 6 from above and below, when the nozzle hole is fully opened, as shown in FIG. Bending stress is applied. Further, when the nozzle hole is fully closed, as shown in FIG. 7 (B), a large bending stress is applied to the lower plate 6 from the point C in the direction of the arrow, and this stress causes the lower plate 6 to deform and break. There is a risk.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve a sliding nozzle device which prevents leakage of molten metal by applying pressure to the mating surfaces of the upper plate and the lower plate. To provide a sliding nozzle device for a molten metal container capable of partially replacing at least one of an upper plate and a lower plate in a sliding direction to partially replace a locally damaged part. The purpose is.

[0012]

According to the present invention for achieving the above object, a molten metal is mounted on the bottom of a molten metal container, and a lower plate on a sliding side is slid against an upper plate on a fixed side. Of the upper plate and / or the lower plate in a sliding nozzle device for a molten metal container, in which the outflow amount of the molten metal is controllable and pressure is applied to the mating surface of the upper plate and the lower plate to prevent leakage of the molten metal. Is divided into a nozzle hole side plate and a holeless side plate in the sliding direction, and the nozzle hole side plate and the nozzle holeless side plate are placed above a convex portion and a concave portion which are mutually provided on the divided surface. Fits without forming a step on the lower surface,
A sliding nozzle device for a molten metal container, characterized in that a nozzle hole side plate and a nozzle hole non-side plate are connected via a pressing body without opening a joint.

[0013]

In the present invention, as described above, the upper plate and the lower plate are
Nozzle each plate in the sliding direction (nozzle longitudinal direction)
It is divided into two parts, one for the hole side and the one without the nozzle hole.
However, since it has a structure that combines these, the nozzle hole
Melting loss of nozzle holes on the side plate, plate surface
Roughness, cracks or no-nozzle side plate surface roughness, cracks
Remove only the plate with the largest wear
Replace it and reuse the plate that is not worn.
Therefore, when replacing the entire plate as in the past,
Can reduce the cost of plate refractories in comparison
You. In addition, for example, as shown in FIG.
The division ratio when dividing is the total plate length L₀,slide
When the stroke is S,
Length L ₂Is preferably selected as follows.

L ₂ <(L ₀ -S) × 0.75 Further, since the convex portion and the concave portion provided on the divided surface of the nozzle hole side plate and the nozzle hole side plate are fitted with each other, The upper and lower surfaces can be joined to each other without forming a step, whereby a flat sliding surface is held and smooth sliding can be held. Furthermore, since the nozzle hole side plate and the nozzle hole side plate are pressed against each other via a pressing body and joined, the joint opening of the concave and convex fitting part is prevented, and sliding smoothly without causing leakage of molten metal. become able to.

Since pressure is applied to the mating surfaces of the upper plate and the lower plate as in the prior art, leakage of molten metal from the mating surfaces can be reliably prevented. Also, the upper nozzle and lower nozzle can secure the required length by connecting the nozzle hole side plate and the nozzle hole side plate, so it is possible to control the flow rate of molten metal by sliding operation as usual. And

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, the sliding nozzle device for a molten metal container according to the present invention will be described in the case of a two-layer type, as shown in FIG. 1 (longitudinal sectional view) and FIG. 2 (plan view taken along the line AA of FIG. 1). , A steel shell 2 constituting the molten metal container 1
An upper nozzle 4 is provided on a laid refractory material 3 constructed on the upper surface of the. An upper plate 5 on the fixed side is provided so as to be connected to the lower portion of the upper nozzle 4, and a lower plate 6 on the sliding side is disposed so as to be horizontally slidable by contacting the lower surface of the upper plate 5. is there. An immersion nozzle 12 is connected to the lower plate 6 in the case of continuous casting.

The upper plate 5 is divided into two parts, a nozzle hole side plate 13 having a nozzle hole 5A and a nozzle hole side plate 14, in the sliding direction, and a lower plate 6 is a nozzle hole side having a nozzle hole 6A. The plate 15 and the plate 16 having no nozzle hole are divided into two parts in the sliding direction. FIG. 3 shows the nozzle hole side plate 13 and the nozzle holeless side plate 14 of the upper plate 5 and the nozzle hole side plate 15 and the nozzle holeless side plate 16 of the lower plate 6, respectively. Such a convex portion 17 and a concave portion 18 are provided,
By fitting the both, the structure is such that the mating surfaces of the upper plate 5 and the lower plate 6 can be connected flat without any step. It goes without saying that the convex portion 17 and the concave portion 18 can be formed in the right and left reversed concavo-convex relationship.

The nozzle hole side plate 15 and the nozzle hole non-side plate 16 which constitute the lower plate 6 have a planar shape as shown in FIG. 2, and tapers 6B and 6C are formed on both sides in the width direction. is there. The nozzle hole side plate 15 is provided with a spacer 20 having a taper which contacts the taper 6B on both sides thereof, and the nozzle hole side plate 16
Is set inside a rectangular casting frame 19 via a spacer 21 having a taper that contacts the taper 6C on both sides thereof.

The spacers 20 arranged in the casting frame 19 so as to come into contact with and sandwich the tapers 6B on both sides formed on the nozzle hole side plate 15 are arranged at one end of the casting frame 19 in the width direction. Two plate fixing bolts 22 are connected.
Further, the spacers 21 arranged in the casting frame 19 so as to contact and sandwich the taper 6C on both sides formed on the plate 16 without nozzle holes, respectively, the spacers 21 have a plurality of coil springs 23 arranged at the other end of the casting frame 19. The contact frame 24 is urged in the casting frame 19 in the longitudinal direction to support the receiving frame 24 in the longitudinal direction. Further, a drive cylinder 8 for sliding the lower plate 6 is connected to one end of the casting frame 19. Since the nozzle hole side plate 13 and the nozzle hole non-side plate 14 which constitute the upper plate 5 are also arranged in the casting frame 19 by the same structure, the lower plate 6 will be described as a representative of the assembly procedure. .

The casting frame 19 in which the lower plate 6 is set according to the above-described structure is supported on the support plate 9 so as to be slidable in the horizontal direction as shown in FIG. 1. The support plate 9 has a plurality of springs. The structure is such that it is supported by the lower lower metal frame 11 via 10. The means for upwardly pressing the lower metal frame 11 is performed by tightening a torque notch with a nut for pressing a conventionally known spring, applying pressure via a spring by a lever link mechanism, or by a pressing machine from the bottom of the plate. It is possible to employ means for pressing and applying a constant pressure. Further, as described with reference to FIG. 8, a mechanism for transmitting the power of the working cylinder via a link, a lever, a cam or the like can be used,
In the present invention, the pressing means for the mating surfaces of the upper plate and the lower plate is not limited.

When assembling the lower plate 6 into the casting frame 19, the casting is made by fitting the convex portion 17 and the concave portion 18 in which the nozzle hole side plate 15 and the nozzle hole side plate 16 are provided on the two divided surfaces to each other. It is placed on the inner upper surface of the frame 19.
And the taper 6B on both sides provided on the nozzle hole side plate 15
And the casting frame 19 with spacers 20 respectively, and the taper 6C on both sides provided on the nozzleless side plate 16 and the casting frame.
Spacers 21 are respectively arranged between the spacers 19 and.

Next, when the two plate fixing bolts 22 arranged at one end of the casting frame 19 are tightened, the spacer 20 contacts the taper 6B and the nozzle hole side plate 15 is pressed to the right in FIG. . As a result, the spacer 21 in contact with the taper 6C of the plate 16 having no nozzle hole is pressed rightward in FIG.
23 is urged toward the compression side. Therefore, the nozzle hole side plate 15 and the nozzle hole non-side plate 16 are formed into the convex portion 17 and the concave portion.
It can be fixed to the casting frame 19 without opening the joint.

In this way, the lower plate 6 is attached to the casting frame 19
The upper plate 5 is fixed to the casting frame 19 for the upper plate by the same procedure. Next, with the support plate 9 being lowered, the lower plate 6 and the upper plate 5 are placed on the support plate 9 in an overlapping manner, and the upper plate 5 and the upper nozzle 4 of the molten metal container 1 are aligned. Subsequently, the lower metal frame 11 is pushed up from below by using the same pressurizing device as in the prior art, and the spring 10 sets it while applying a predetermined pressure to the mating surface of the upper plate 5 and the lower plate 6. Then, one end of the support plate 9 is connected to the drive cylinder 8. Only when the lower plate 6 is slid using the drive cylinder 8, the pressure applied to the mating surface of the upper plate 5 and the lower plate 6 is reduced so that the lower plate 6 can be slid easily. You can also do it.

If any of the nozzle hole side plates 13 and 15 and the nozzle hole side plates 14 and 16 is damaged, only the damaged plate will be replaced through the procedure reverse to the above. According to the present invention, conventionally, the lower plate total length L ₀ = 520 m
m and slide stroke S = 200mm,
Nozzle hole side plate length L ₁ = 290 mm, nozzle hole side plate L ₂ = 230 mm shown in FIG. 4, lower plate total length L ₀
Even if the total nozzle length is set to 520 mm and the nozzle hole side plate is normally damaged and needs to be replaced frequently, the plate with no nozzle hole side is extremely damaged, so it is used semipermanently. You can do it. The results of use are compared and shown in Table 1.

[0025]

[Table 1]

As shown in Table 1, according to the present invention, the number of charges used on the side without a nozzle hole can be significantly increased, so that the refractory cost can be reduced. by the way,
In the above-described embodiment, the case where both the upper nozzle and the lower nozzle have the two-divided structure has been described, but only one of them, for example, only the lower nozzle can have the two-divided structure, if necessary. In addition, we explained the combination of plate fixing bolts, spacers, and coil springs as the pressing body.However, the mechanism that tightens the nut that presses the spring with the torque notch, the mechanism that presses the spring with the lever link mechanism, the pressing machine such as the working cylinder and the spring. It is possible to utilize the structure etc. which combined and. Further, the present invention can be applied to, for example, a three-layer type sliding nozzle device other than the two-layer type.

[0027]

As described above, according to the present invention,
Since the upper nozzle and / or the lower nozzle included in the sliding nozzle device of the molten metal container are provided on the two split surfaces in the sliding direction, the convex portion and the concave portion are fitted together,
Both can be joined to the upper and lower surfaces without steps, a flat sliding surface is secured, and smooth sliding can be maintained.

Further, since the nozzle hole side plate and the nozzle hole non-side plate formed by dividing into two are joined by pressing through the pressing body, leakage of molten metal due to opening of joint can be prevented. Further, of the two divided plates, only one of the plates that is significantly damaged is replaced and the other is reused, so that the refractory cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an apparatus according to the present invention.

FIG. 2 is a plan view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a partial side view showing a concave-convex fitting portion of the two-divided plate according to the present invention.

FIG. 4 is a view showing a nozzle hole side plate and a nozzle hole according to the present invention.
Set the length of the side plate to the total length L ₀And slide stroke
It is explanatory drawing shown in relation with S.

FIG. 5 is a vertical cross-sectional view showing a conventional device.

FIG. 6 is an explanatory view showing a pressing state of a conventional mating surface between an upper plate and a lower plate.

FIG. 7 is an explanatory diagram showing a pressing state of a mating surface of a lower plate when the upper plate is shortened.

FIG. 8 is a vertical cross-sectional view showing a conventional pressurizing device for a mating surface of an upper nozzle and a lower nozzle.

[Explanation of symbols]

 1 Molten Metal Container 2 Iron Peel 3 Refractory Material 4 Upper Nozzle 5 Upper Plate 6 Lower Plate 7 Molten Metal 8 Driving Cylinder 9 Support Plate 10 Spring 11 Lower Metal Frame 12 Immersion Nozzle 13 Nozzle Hole Side Plate 14 Nozzle Hole Side Plate 15 Nozzle hole side plate 16 No nozzle hole side plate 17 Convex part 18 Concave part 19 Casting frame 20 Spacer 21 Spacer 22 Plate fixing bolt 23 Coil spring 24 Receiving frame

Claims (1)

[Claims] 1. A molten metal container is attached to the bottom of the container, and a sliding-side lower plate is slid against a fixed-side upper plate to control the outflow amount of molten metal. In a sliding nozzle device for a molten metal container in which pressure is applied to the mating surfaces of the plates to prevent leakage of the molten metal, the upper plate and / or the lower plate are slidable in the nozzle hole side plate and the holeless side plate. The nozzle hole side plate and the nozzle hole side plate are fitted into each other without a step between the upper and lower surfaces through the convex portion and the concave portion which are provided on the divided surface, and the nozzle hole side A sliding nozzle device for a molten metal container, characterized in that a plate and a plate having no nozzle hole are connected to each other via a pressing body without opening a joint.