JPH10314903A - Structure for fitting nozzle for continuous casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the change of an immersion nozzle and also, to position the immersion nozzle so as not to obstruct at the time of no using by putting away the part supporting the immersion nozzle into the iron shell side of a tundish. SOLUTION: This fitting structure of the immersion nozzle is provided with two rails 10 rotatably connected with a flange 9 on the bottom iron shell 2 of the tundish 1, a rotating means 11 for rotating the rails toward the iron shell side of the tundish round the connecting point of the rails and the flange as an axis, an upper nozzle 4 supported at the intermediate position of two rails with a supporting body 13 arranged at the bottom iron shell of the tundish, with the lower end part thereof positioned at lower than the lower end part of the rail, the immersion nozzle 5 held in a holder 12 and having the shape in which the upper end surface is brought into close contact with the lower end surface of the upper nozzle, an immersion nozzle supporting tool 14 for holding the immersion nozzle held with the holder 12 and an inclining means for inclining the immersion nozzle supporting tool centered on the rails for bringing the immersion nozzle into close contact with the upper nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type continuous casting nozzle mounting structure for forming molten steel outflow holes into a mold at the bottom of a tundish of a continuous casting facility.

[0002]

2. Description of the Related Art In continuous casting, molten steel is once injected into a tundish from a ladle and then injected into a mold through a continuous casting nozzle provided at the bottom of the tundish. The main purpose of the continuous casting nozzle is to prevent the oxidation of molten steel by air, and therefore, the continuous casting nozzle is used while being immersed in the molten steel in the mold. In addition, since mold powder is added on the molten steel in the mold as an air oxidation inhibitor for the molten steel and a lubricant between the mold and the solidified shell, the nozzle for continuous casting is melted by the mold powder, and one continuous casting is performed. Nozzles cannot cope with long casting times.

[0003] Therefore, a continuous casting nozzle, for example,
Like a sliding nozzle, it is divided into four parts such as an upper nozzle, a fixed platen, a sliding plate, and an immersion nozzle. A casting method has been practiced in which a submerged nozzle is replaced during casting.

During the replacement of the immersion nozzle, it is necessary to interrupt the casting. If the interruption time is long, the quality of the slab is deteriorated, such as the solidification of the molten steel surface and the incorporation of mold powder. Work troubles such as breakouts occur. In addition, when the tundish is raised to replace the immersion nozzle and the immersion nozzle is lifted from the molten steel in the mold, in the case of multi-strand casting, it is necessary to interrupt the casting of other sound strands as well. It also has an adverse effect on quality.

[0005] Therefore, it is necessary to replace the immersion nozzle promptly and in a manner that does not adversely affect the quality of other healthy strands. In order to solve this problem, it is necessary to mount the immersion nozzle. Many attempts have been made to devise the structure and the replacement method.

[0006] For example, Japanese Patent Publication No. 1-15344 (hereinafter referred to as "prior art 1") discloses that a dipping nozzle held on a nozzle hanger protruding from an elevating body is raised and lowered by lifting and lowering the elevating body. Using a nozzle mounting device to be attached to and detached from the nozzle, and a nozzle changing device arranged near the mold, when replacing the immersion nozzle, the immersion nozzle held by the nozzle changing device is moved horizontally while moving toward the nozzle mounting device. A nozzle replacement method for changing the attitude from a vertical position to a vertical position is disclosed. According to Prior Art 1,
Since the immersion nozzle is horizontal, the work space required for immersion nozzle replacement work can be maintained in a steady state at the casting position of the tundish, so the immersion nozzle can be replaced without affecting casting by sound nozzles .

Also, Japanese Utility Model Laid-Open No. Hei 4-26663 (hereinafter, referred to as “Japanese Utility Model Application Publication No.
In the “prior art 2”, the continuous casting nozzle is divided into an upper nozzle and an immersion nozzle, and parallel rails are provided hanging down from the bottom of the tundish. A structure for mounting an immersion nozzle on an immersion nozzle support is disclosed. According to the prior art 2, the immersion nozzle can be accurately and quickly attached.

[0008]

However, when the cross-sectional area of the mold of a billet continuous casting machine or the like is small, the side wall of the mold and the immersion nozzle are close to each other, and in the prior art 1, the immersion nozzle is detached from only one direction. Therefore, it takes time to detach and attach the immersion nozzle, and the quality of the cast slab during that time is problematic.

In the prior art 2, since the immersion nozzle is mounted on the immersion nozzle support in a vertical state and then moved immediately below the upper nozzle, the tundish is raised to immerse the mold between the upper end of the mold and the bottom of the tundish. Although it is necessary to secure a space through which the nozzle passes and it is possible to perform the operation quickly, it is not suitable for a multi-strand continuous casting machine.

Further, in both the prior art 1 and the prior art 2, the immersion nozzle mounting device provided at the bottom of the tundish cannot be easily removed, so that when the tundish is moved or the tundish is maintained. Since it is an obstacle, problems such as breakage of the immersion nozzle mounting device and enlargement of the tundish maintenance device occur.

The present invention has been made in view of the above circumstances, and its purpose is to simplify an immersion nozzle mounting device and to store a portion supporting the immersion nozzle on the steel skin side of the bottom of the tundish. Another object of the present invention is to provide a continuous casting nozzle mounting structure that facilitates replacement of an immersion nozzle and does not hinder the immersion nozzle when not in use.

[0012]

According to a first aspect of the present invention, there is provided a continuous casting nozzle mounting structure comprising: a flange provided on a steel shell at a bottom of a tundish; and two rails rotatably connected to the flange. Rotation means for rotating the two rails to the tundish steel side around the connection point between the rail and the flange, respectively, and a support provided on the tundish bottom steel shell, an intermediate position between the two rails. Holds the upper nozzle whose lower end position is higher than the lower end position of the rail, the immersion nozzle housed in the holder, the upper end surface of which is in close contact with the lower end surface of the upper nozzle, and the immersion nozzle housed in the holder. A immersion nozzle support to be immersed, and a tilting means for inclining the immersion nozzle support with the rail as a fulcrum in order to bring the immersion nozzle into close contact with the upper nozzle. It made.

In the present invention, the immersion nozzle is housed in the holder and placed on the immersion nozzle support, and then the immersion nozzle support is inclined with the rail as a fulcrum, and the immersion nozzle is pressed against the upper nozzle and attached. At this time, the rail can be rotated toward the tundish steel by the rotating means, so that the rail does not become an obstacle to the operation of attaching and detaching the immersion nozzle. Therefore, the immersion nozzle can be detached from any direction. In addition, when the immersion nozzle is not mounted, the rail can be stored at the bottom of the tundish, which facilitates transportation and maintenance of the tundish.

Further, the mounting structure of the continuous casting nozzle according to the second aspect of the present invention comprises a first flange provided on the steel shell at the bottom of the tundish, and two lifting and lowering members rotatably connected to the first flange. A cylinder, two rails integrally formed with a cylinder rod of each lifting cylinder, and a second flange of a tundish bottom steel shell rotatably connected to the cylinder rod; Connected to the cylinder rod of the lifting cylinder, the storage cylinder that rotates the rail to the tundish steel side around the connection point between the lifting cylinder and the first flange, and the steel cylinder at the bottom of the tundish An upper nozzle which is supported at an intermediate position between the two rails and whose lower end position is higher than the lower end position of the rails, Housed in Ruda, and shaped to contact the upper surface to the lower end surface of the upper nozzle, and consists of a submerged nozzle in close contact with the upper nozzle through the rail by the operation of the lifting cylinder, equipped with a configuration.

In the present invention, the rail is raised by the operation of the lift cylinder, and the immersion nozzle is pressed against the upper nozzle and attached. At this time, the rail can be rotated to the tundish steel side by the operation of the lifting cylinder or the storage cylinder connected to the cylinder rod of the lifting cylinder. Does not. Therefore, the immersion nozzle can be detached from any direction. In addition, when the immersion nozzle is not mounted, the rail can be stored at the bottom of the tundish, which facilitates transportation and maintenance of the tundish.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a mounting structure showing one embodiment of the first invention, FIG. 2 is a schematic side view, and FIG. 3 is an explanatory view when a submerged nozzle is detached.

In FIG. 1, a tundish 1 in which a refractory 3 is applied to the inner surface of a steel shell 2 is mounted on a tundish car (not shown) and placed above a mold 7. At the bottom of the tundish 1, a support 13 is fixed to the iron cover 2 with bolts 25, and the upper nozzle 4 is supported by the support 13. The upper portion of the upper nozzle 4 that tapers upward passes through the opening of the steel shell 2 and is fitted to the refractory 3 provided at the bottom of the tundish 1. Above the upper nozzle 4, a stopper 6 is disposed for adjusting the flow rate of molten steel.

Flanges 9 and 9 are provided on the steel shell 2 at the bottom of the left and right tundish 1 with the upper nozzle 4 interposed therebetween.
The flange 9 and the L-shaped rail 10 are rotatably connected by pins 26 with the lower end of the rail 10 being lower than the lower end of the upper nozzle 4. The flange 9 and the rail 10 are connected by a coil spring 11,
The rail 10 is rotated by the coil spring 11 toward the bottom steel 2 of the tundish 1 and stored. On the other hand, the immersion nozzle 5 is housed in the holder 12, and the upper end surface of the immersion nozzle 5 has a shape that is in close contact with the lower end surface of the upper nozzle 4.

First, after the rail 10 is stored in the bottom of the tundish 1 by the coil spring 11, the holder pin 24 of the holder 12 containing the immersion nozzle 5 is placed on the immersion nozzle support 14, and then the immersion nozzle support 14 The immersion nozzle 5 is temporarily held immediately below the upper nozzle 4.
As shown in FIGS. 6A and 6B, the immersion nozzle support 14 has a fulcrum shaft 27 at an intermediate portion, a tip becomes a nozzle hanger 28, and the other end is supported by human power or the like. What is necessary is just a model.

Next, the rail 10 is rotated and dropped.
The holder 12 and the portion of the nozzle hanger 28 from the fulcrum shaft 27 of the immersion nozzle support 14 are placed on a horizontal plane below the rail 10. Thereafter, the weight 15 is attached to the immersion nozzle support 14 on the opposite side of the nozzle hanger portion 28 with the fulcrum shaft 27 as a boundary, and the immersion nozzle 5 is inclined with the fulcrum shaft 27 as a fulcrum, and is brought into close contact with the upper nozzle 4. . At this time, a groove is provided at a predetermined position of the rail 10 to support the fulcrum shaft 27.
Can be easily aligned with the center position of the upper nozzle 4 and the immersion nozzle 5.

In this way, the molten steel outflow hole 29 from the tundish 1 to the mold 7 is formed, and the molten steel 8 injected into the tundish 1 is immersed in the molten steel 8 in the mold 7 covered with the mold powder 23. It is cast. The removal of the immersion nozzle 5 can be performed in the reverse process.

In the above, the coil spring 11 is used as the rotating means.
However, the rotating means is not limited to the coil spring 11, but may be, for example, a leaf spring as long as it is a spring, or may use the power of an electric motor or a hydraulic motor. Similarly, the immersion nozzle support 14 is mechanized,
Power such as an electric motor or a hydraulic motor can also be used as the tilting means. Further, the continuous casting nozzle is not limited to the two-piece type, and in the case of a sliding nozzle, the present invention can be applied by replacing the rectifying nozzle connected to the sliding board with the upper nozzle 4 of the present application. .

Next, the second invention will be described with reference to the drawings. FIG. 4 is a schematic longitudinal sectional view of a mounting structure showing one embodiment of the second invention, and FIG. 5 is an explanatory view when the immersion nozzle is detached.

In the drawing, a tundish 1 in which a refractory 3 is applied to the inner surface of a steel shell 2 is mounted on a tundish car (not shown) and placed above a mold 7. At the bottom of the tundish 1, a support 13 is fixed to the iron cover 2 with bolts 25, and the upper nozzle 4 is supported by the support 13. The upper portion of the upper nozzle 4 that tapers upward passes through the opening of the steel shell 2 and is fitted to the refractory 3 provided at the bottom of the tundish 1. Above the upper nozzle 4, a stopper 6 is disposed for adjusting the flow rate of molten steel.

First steel flanges 21, 21 are provided on the steel shell 2 at the bottom of the left and right tundish 1 with the upper nozzle 4 interposed therebetween. The first flanges 21, 21 and the nozzle lifting cylinders 16, 16 are connected to each other. They are rotatably connected by pins 26,26. Then, the nozzle lifting / lowering cylinder 16
The L-shaped rail 10 integrally formed with the cylinder rod 17 of FIG.
Is provided below the lower end position of the upper nozzle 4. A second flange 2 is provided on the steel shell 2 on the opposite side of the upper nozzle 4 with respect to the nozzle lifting cylinder 16.
2 and 22 are provided, and the second flange 22 and the rail storage cylinder 19 are rotatably connected by pins 26. The cylinder rod 20 of the rail storage cylinder 19 is rotatably connected to the cylinder rod 17 by a pin 18, and the integrally constructed nozzle lifting cylinder 16 and the rail 10 are connected to the rail storage cylinder 19. When the tundish 1 is actuated, the tundish 1 is rotated and stored toward the bottom steel 2 side. On the other hand, the immersion nozzle 5 is housed in the holder 12, and the upper end surface of the immersion nozzle 5 has a shape that is in close contact with the lower end surface of the upper nozzle 4.

First, after the rail 10 is stored by the operation of the rail storage cylinder 19, the holder pin 24 of the holder 12 containing the immersion nozzle 5 is placed on the immersion nozzle support 14, and then the immersion nozzle support 14 is used. The immersion nozzle 5 is temporarily held immediately below the upper nozzle 4. still,
As shown in FIGS. 6A and 6B, for example, the immersion nozzle support 14 may be of a type in which the tip is a nozzle hanger portion 28 and the other end is supported by human power or the like.

Next, the rail 10 is suspended by the operation of the rail storage cylinder 19, and then the nozzle lifting cylinder 16 is operated to raise the rail 10.
The horizontal surface at the bottom of the rising rail 10 will soon be the holder 1
2, the immersion nozzle 5 rises together with the holder 12 and comes into close contact with the upper nozzle 4. When the immersion nozzle 5 and the upper nozzle 4 are connected, the immersion nozzle support 14 is removed.

The molten steel outflow hole 29 from the tundish 1 to the mold 7 is thus formed, and the molten steel 8 injected into the tundish 1 is immersed in the molten steel 8 in the mold 7 covered with the mold powder 23. It is cast. The removal of the immersion nozzle 5 can be performed in the reverse process.

In the above description, the rail storage cylinder 19 is used.
Although the cylinder rod 20 is connected to the cylinder rod 17, the cylinder rod 20 operates in exactly the same manner when connected to the nozzle lifting cylinder 16, and therefore may be connected to the nozzle lifting cylinder 16. Further, the continuous casting nozzle is not limited to the two-piece type, and in the case of a sliding nozzle, the present invention can be applied by replacing the rectifying nozzle connected to the sliding board with the upper nozzle 4 of the present application. .

[0030]

EXAMPLES Example 1 In a 6-strand billet continuous casting machine having a mold cross section of 300 mmφ, an immersion nozzle replacement operation was performed during casting in the mounting structure shown in FIG. The work procedure is shown below. 1. A few hours before the replacement of the immersion nozzle, the preheating of the new immersion nozzle is started in a state of being stored in the holder. 2. At the time of replacement of the immersion nozzle, the tundish is raised to the upper limit position where casting is possible. 3. Close the stopper of the strand to be replaced with the immersion nozzle, and temporarily suspend the casting. 4. Remove the weight of the immersion nozzle support and separate the immersion nozzle from the upper nozzle. 5. With the immersion nozzle supported by the immersion nozzle support by human power, both the left and right rails or any one of the rails are stored, and then the immersion nozzle on the immersion nozzle support is manually removed in any direction outside the mold. . 6. Place the new pre-heated new immersion nozzle on the immersion nozzle support and support it just below the upper nozzle in the mold.
Hang the left and right rails. 7. A weight is attached to the immersion nozzle support, and the immersion nozzle is brought into close contact with the upper nozzle. 8. After confirming the installation of the immersion nozzle, lower the tundish and resume casting.

By the above procedure, the replacement operation of the immersion nozzle could be performed without interrupting the casting of other strands.

Example 2 The cross section of the mold was 120 mmφ.
In a six-strand billet continuous casting machine, FIG.
The submerged nozzle replacement operation during casting in the mounting structure shown in FIG. The work procedure is shown below. 1. A few hours before the replacement of the immersion nozzle, the preheating of the new immersion nozzle is started in a state of being stored in the holder. 2. At the time of replacement of the immersion nozzle, the tundish is raised to the upper limit position where casting is possible. 3. Close the stopper of the strand to be replaced with the immersion nozzle, and temporarily suspend the casting. 4. The nozzle raising / lowering cylinder is operated to extend the cylinder rod of the nozzle raising / lowering cylinder to lower the rail, and the immersion nozzle is separated from the upper nozzle. 5. After inserting the immersion nozzle support under the holder pin,
In a state where the immersion nozzle is supported by the immersion nozzle support by human power, the rail storage cylinder is operated to store both the left and right or any one of the rails, and then the immersion nozzle mounted on the immersion nozzle support is manually operated. Remove in any direction outside the mold. 6. The new pre-heated immersion nozzle is placed on the immersion nozzle support and is supported immediately below the upper nozzle in the mold. In this state, the rail storage cylinder is operated to cause the left and right rails to hang down. 7. After the hanging of the left and right rails is completed, the rail is raised by operating the nozzle elevating cylinder, and the immersion nozzle is brought into close contact with the upper nozzle. 8. After confirming the installation of the immersion nozzle, the immersion nozzle support is removed, the tundish is lowered, and casting is restarted.

By the above procedure, the replacement operation of the immersion nozzle could be performed without interrupting the casting of the other strand. In the second embodiment, the cylinder for raising and lowering the nozzle and the cylinder for storing the rail can be remotely controlled.
Compared to Example 1, a quicker immersion nozzle replacement operation could be achieved.

[0034]

According to the present invention, since the rail for supporting the immersion nozzle installed at the bottom of the tundish can be stored,
The immersion nozzle can be taken in and out from any direction, so that even in a continuous caster having a small mold cross-sectional area, the immersion nozzle can be replaced without interrupting the casting of other strands. Also, when it is not necessary, since it is stored in the bottom of the tundish, there is no breakage during transportation, and the tundish maintenance site can be narrowed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mounting structure according to an embodiment of the first invention.

FIG. 2 is a side view of the attachment structure showing the embodiment of the first invention.

FIG. 3 is an explanatory view of a nozzle mounting structure for continuous casting according to the first invention when a submerged nozzle is attached / detached.

FIG. 4 is a longitudinal sectional view of a mounting structure showing an embodiment of the second invention.

FIG. 5 is an explanatory view of a continuous casting nozzle mounting structure according to the second invention when a submerged nozzle is detached and attached.

FIGS. 6A and 6B are diagrams illustrating an immersion nozzle support used in the first invention, wherein FIG. 6A is a side view and FIG. 6B is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tundish 2 Iron shell 3 Refractory 4 Upper nozzle 5 Immersion nozzle 6 Stopper 7 Mold 8 Molten steel 9 Flange 10 Rail 11 Coil spring 12 Holder 13 Supporter 14 Immersion nozzle support 15 Weight 16 Nozzle elevating cylinder 17 Cylinder rod 18 Pin 19 Rail storage cylinder 20 Cylinder rod 21 First flange 22 Second flange

Claims (2)

[Claims] 1. A flange provided on a steel shell at the bottom of a tundish, two rails rotatably connected to the flange, and a rail at a connection point between the rail and the flange. The rotating means for rotating the dish iron side respectively, and the support provided on the tundish bottom iron shell,
An upper nozzle that is supported at the middle position of the rail and whose lower end position is higher than the lower end position of the rail, and is housed in a holder, and an immersion nozzle whose upper end surface is in close contact with the lower end surface of the upper nozzle, and is housed in a holder. Nozzle mounting means for holding the immersion nozzle, and a tilting means for inclining the immersion nozzle support with the rail as a fulcrum in order to bring the immersion nozzle into close contact with the upper nozzle; . 2. A first flange provided on a steel shell at the bottom of the tundish, and two flanges respectively rotatably connected to the first flange.
Two lifting cylinders, two rails integrated with the cylinder rods of each lifting cylinder, and a rotatable connection to the second flange of the steel skin at the bottom of the tundish, and lifting and lowering of the cylinder rod Connected to the cylinder rod of the lifting cylinder or the lifting cylinder,
The storage cylinder that rotates the rail toward the tundish steel around the connection point between the lifting cylinder and the first flange and the support provided on the tundish bottom
An upper nozzle whose lower end position is higher than the lower end position of the rail, which is supported at an intermediate position of the rail, and which is housed in a holder, and whose upper end surface is in close contact with the lower end surface of the upper nozzle; And an immersion nozzle that is brought into close contact with the upper nozzle via a rail by operation.