KR101193857B1 - Apparatus for exchanging shroud nozzle - Google Patents

Abstract

The present invention includes a body, a post extending along a first direction and rotatably installed on the body about a line along the first direction, and a post along the direction crossing the first direction. A lifting unit, which is installed to be movable and supports the shroud nozzle, and the lifting unit, which is formed to elevate the body along the first direction, and is installed on a surface of the both sides of the body opposite to the post. Provided, a shroud nozzle replacement device.

Description

Shroud nozzle replacement device {APPARATUS FOR EXCHANGING SHROUD NOZZLE}

The present invention relates to a shroud nozzle replacement apparatus for replacing and mounting the shroud nozzle to the collector nozzle installed in the ladle.

In general, a continuous casting machine is a facility for producing slabs of a constant size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it as a mold for a continuous casting machine.

The continuous casting machine includes a ladle for storing molten steel, a continuous casting machine mold for cooling the tundish and the molten steel discharged from the tundish to form a casting having a predetermined shape, and a casting formed in the mold connected to the mold. It includes a plurality of pinch roller to move.

In other words, the molten steel tapping out of the ladle and tundish is formed of a slab (Slab) or bloom (Bloom), billet (Billet) having a predetermined width and thickness in the mold and is transferred through the pinch roller.

It is an object of the present invention to provide a shroud nozzle replacement device for maintaining the straightness of the shroud nozzle upon replacement of the shroud nozzle with respect to the collector nozzle of the ladle.

Shroud nozzle replacement apparatus according to an embodiment of the present invention for realizing the above object, extending along the first direction, rotatably installed on the body around a line along the first direction A post and an arm movably installed on the post along a direction crossing the first direction, the arm being configured to support a shroud nozzle, and a body configured to elevate the body along the first direction. It includes a lifting unit, which is installed on the surface opposite to the post on both sides of the body.

Here, the arms may be formed of a plurality of spaced apart from each other.

Here, the moving unit may be further provided to move the body in a direction crossing the moving direction of the arm.

Here, the moving unit may include a sliding plate disposed between the body and the lifting unit.

Here, the height sensing unit for detecting the height of the ladle, and the control unit for controlling the lifting unit based on the lifting degree of the ladle may be further provided.

According to the shroud nozzle replacement apparatus according to the present invention configured as described above, it is possible to maintain the straightness of the shroud nozzle when replacing the shroud nozzle with respect to the collector nozzle of the ladle.

1 is a side view showing a continuous casting machine according to an embodiment of the present invention,
2 is a conceptual diagram illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel (M),
3 is a partial cross-sectional view conceptually showing the configuration of a part for tapping the molten metal of the ladle 10 of FIG.
4 is a conceptual view showing a first posture of the shroud nozzle replacement apparatus according to the embodiment of the present invention;
5 is a conceptual view illustrating a second posture of the shroud nozzle replacement apparatus of FIG. 4.

Hereinafter, a shroud nozzle replacement apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar configurations, and the description is replaced with the first description.

Continuous casting is a casting method in which a casting or steel ingot is continuously extracted while solidifying molten metal in a mold without a bottom. Continuous casting is used to manufacture simple products such as squares, rectangles, circles, and other simple cross-sections, and slab, bloom and billets, which are mainly for rolling.

The type of continuous casting machine is classified into vertical type, vertical bending type, vertical axis difference bending type, curved type and horizontal type. 1 and 2 illustrate a curved shape.

1 is a side view showing a continuous casting machine related to an embodiment of the present invention.

Referring to this drawing, the continuous casting machine may include a tundish 20, a mold 30, secondary cooling tables 60 and 65, a pinch roll 70, and a cutter 90.

The tundish 20 is a container that receives molten metal from the ladle 10 and supplies molten metal to the mold 30. Ladle 10 is provided in a pair, alternately receives molten steel to supply to the tundish 20. In the tundish 20, the molten metal supply rate is adjusted to the mold 30, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the non-metallic inclusions are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 forms a hollow portion in which molten steel is accommodated as a pair of structurally facing faces are opened. In manufacturing the slab, the mold 30 comprises a pair of barriers and a pair of end walls connecting the barriers. Here, the short wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated to move away from or close to each other to have a certain level of taper. This taper is set to compensate for shrinkage caused by solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 has a strong solidification angle or solidifying shell 81 (see FIG. 2) so that the casting extracted from the mold 30 maintains its shape and does not leak molten metal which is still less solidified. It serves to form. The water cooling structure includes a method of using a copper pipe, a method of drilling a water cooling groove in the copper block, and a method of assembling a copper pipe having a water cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricants are used to reduce friction between the mold 30 and the casting during oscillation and to prevent burning. Lubricants include splattered flat oil and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag, as well as the lubrication of the mold 30 and the casting, as well as the oxidation and nitriding prevention and thermal insulation of the molten metal in the mold 30, and the non-metal inclusions on the surface of the molten metal. It also performs the function of absorption. In order to inject the powder into the mold 30, a powder feeder 50 is installed. The part for discharging the powder of the powder feeder 50 faces the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel that has been primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spray 65 spraying water while maintaining the solidification angle by the support roll 60 so as not to deform. Casting solidification is mostly achieved by the secondary cooling.

The drawing device adopts a multidrive method using a plurality of sets of pinch rolls 70 and the like so that the casting can be taken out without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The cutter 90 is formed to cut continuously produced castings to a constant size. As the cutter 90, a gas torch, a hydraulic shear, or the like can be employed.

FIG. 2 is a conceptual view illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel M. Referring to FIG.

Referring to this figure, the molten steel (M) is to flow to the tundish 20 in the state accommodated in the ladle (10). For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends to be immersed in the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrided. The case where molten steel M is exposed to air due to breakage of shroud nozzle 15 is called open casting.

The molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 corresponding to the immersion nozzle 25. Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25. Control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method, which is different from the stopper method. The slide gate controls the discharge flow rate of the molten steel M through the immersion nozzle 25 while the sheet material slides in the horizontal direction in the tundish 20.

The molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface of the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M. The rear portion along the casting direction of the strand 80 is formed by the non-solidified molten steel 82 being wrapped around the solidified shell 81 in which the molten steel M is solidified by the method in which the peripheral portion first solidifies.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the fully solidified strand 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The uncondensed molten steel 82 is cooled by the spray 65 for spraying cooling water in the course of the above movement. This causes the thickness of the uncooled steel (82) in the strand (80) to gradually decrease. When the strand 80 reaches the solidification completion point 85, which is a point, the strand 80 is filled with the solidification shell 81 in its entire thickness. The solidified strand 80 is cut to a predetermined size at the cutting point 91 and divided into a product P such as a slab.

3 is a partial cross-sectional view conceptually showing the configuration of a portion for tapping the molten metal of the ladle 10 of FIG.

Referring to this figure, a tap hole 10 'for tapping the molten steel is opened at the bottom of the ladle 10. The upper nozzle 11 is inserted into the tap hole 10 '.

The upper and lower slide gates 12 and 13 are provided below the upper nozzle 11. The collector nozzle or the lower nozzle 14 is provided below the lower slide gate 13. The shroud nozzle 15 is fastened to the lower nozzle 14.

The upper and lower slide gates 12 and 13 open and close a moving passage of molten steel from the upper nozzle 11 to the shroud nozzle 15 while slidingly moving in the horizontal direction in the drawing.

Next, an apparatus for replacing the shroud nozzle 15 that is coupled to the collector nozzle 14 will be described.

4 is a conceptual view illustrating a first posture of the shroud nozzle replacement apparatus according to the exemplary embodiment of the present invention.

Referring to this figure, the shroud nozzle replacement device, the body 100, the post 200, the arm 300, the lifting unit 400, the moving unit 500, the control unit 600 It may include.

Body 100 is a member for supporting other components. Rotational support 110 may be formed on the upper side of the body 100.

The post 200 is a member extending along the first direction. The post 200 may be installed in the body 100 to rotate in a direction R about a line along the first direction. In detail, the lower end of the post 200 is rotatably supported by the rotation support 110.

The arm 300 is a member disposed to extend along a direction L that intersects the first direction. The arm 300 may be installed to be movable in the post 200. In detail, the extending direction L of the arm 300 may be a direction perpendicular to the first direction of the post 200.

The free end of the arm 300 is formed to support the shroud nozzle 15. Arm 300 may include a plurality of spaced apart members. The spaced members may be arranged parallel to each other. Employing a plurality of members provides a more effective advantage in maintaining the straightness of the shroud nozzle 15.

The elevating unit 400 is formed to elevate the body 100 along a direction V parallel to the first direction. To this end, the lifting unit 400 may be installed on the opposite side of the surface on which the post 200 is installed on both sides of the body 100. As a result, the lifting unit 400 may support the body 100 and the post 200.

The moving unit 500 may be formed to move the body 100 along a direction crossing the moving direction L of the arm 300. Specifically, the moving direction P of the body 100 by the moving unit 500 may be substantially perpendicular to the moving direction L of the arm 300.

The moving unit 500 may be specifically, a sliding plate disposed below the body 100. The sliding plate may be a plate having substantially the same area as the body 100. In order to move relative to the body 100, the sliding plate may be provided with a rail or a gear.

The control unit 600 controls the operation of the lifting unit 400. The operation of the elevating unit 400 may be determined by the control unit 600 based on whether the shroud nozzle 15 is installed or the elevating ladle 10 to be installed. In order to determine the height of the ladle 10 may be provided with a height detecting unit 610. The height detecting unit 610 may be disposed along one side of the path in which the ladle 10 moves up and down.

According to this configuration, the shroud nozzle replacement device is operated to couple the shroud nozzle 15 to the collector nozzle 14 installed in the ladle 10.

In order to bring the shroud nozzle 15 supported by the arm 300 close to the collector nozzle 14, the post 200 can be rotated in the direction of rotation R to bring them close.

Planar positioning of the shroud nozzle 15 with respect to the collector nozzle 14 includes forward / reverse along one direction L of the arm 300 and another direction by the moving unit 500 of the body 100. By movement along (P).

Furthermore, the proximity of the shroud nozzle 15 to the collector nozzle 14 in the height direction can be achieved by operating the elevating unit 400 to cause the body 100 to elevate.

5 is a conceptual view illustrating a second posture of the shroud nozzle replacement apparatus of FIG. 4.

Referring to this figure, the post 200 of the shroud nozzle replacement apparatus is rotated in the rotation direction (R) to maintain the second posture.

In the second posture, the shroud nozzle 15 is out of alignment with the collector nozzle 14. In this position, the shroud nozzle 15 may be replaced or the straightness of the shroud nozzle 15 may be checked.

To this end, the arm 300 is moved forward or backward in the longitudinal direction (L) to move the free end of the arm 300 to the place where the shroud nozzle 15 is located.

Such a shroud nozzle replacement apparatus is not limited to the configuration and manner of operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: ladle 14: collector nozzle
15: shroud nozzle 20: tundish
25: immersion nozzle 30: mold
40: mold oscillator 50: powder feeder
60: support roll 65: spray
70: pinch roll 80: strand
81: solidified shell 82: unsolidified molten steel
83: tip 85: solidification completion point
87: oscillation mark 88: bulging area
90: cutting machine 91: cutting point
100: body 200: post
300: arm 400: lifting unit
500: mobile unit 600: control unit

Claims (5)

Body;
A post extending along a first direction and rotatably installed on the body about a line along the first direction;
An arm installed horizontally on the post in a direction crossing the first direction and configured to support a shroud nozzle;
An elevating unit which is formed to elevate the body along the first direction and is installed on a surface of the both sides of the body opposite to the post;
A sliding plate type moving unit disposed between the body and the lifting unit and configured to horizontally move the body along a direction crossing the moving direction of the arm;
A height sensing unit disposed along one side of which the ladle is lifted and configured to sense the height of the ladle; And
And a control unit for controlling the lifting unit based on the lifting degree of the ladle,
The shroud nozzle replacement device, the arm is formed of a plurality of spaced apart from each other
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