KR20110120544A

KR20110120544A - Jig for drawing bubbling cone of ladle and method for drawing bubbling cone using the same

Info

Publication number: KR20110120544A
Application number: KR1020100039997A
Authority: KR
Inventors: 유대경
Original assignee: 현대제철 주식회사
Priority date: 2010-04-29
Filing date: 2010-04-29
Publication date: 2011-11-04

Abstract

The present invention includes a main body having a towing portion protruding to be pulled by a hydraulic cylinder, a first arm pivotally connected to a first portion of the main body and having a first protrusion, and a pivotable portion to a second portion of the main body. It provides a ladle bubbling cone drawing jig and a drawing method using the same ladle comprising a second arm having a second arm which is connected to each other and protruding in a direction toward the first protrusion.

Description

JIG FOR DRAWING BUBBLING CONE OF LADLE AND METHOD FOR DRAWING BUBBLING CONE USING THE SAME}

The present invention relates to a jig for drawing and dismantling a bubbling cone of a ladle and a method of drawing a bubbling cone using the same.

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.

At the bottom of the ladle, a bubbling cone is provided for supplying argon (Ar) gas to the molten metal contained in the ladle. Bubbling cones are periodically drawn and replaced due to hot expansion.

It is an object of the present invention to provide a ladle bubbling cone drawing jig and a drawing method using the same that can improve the pullability of the bubbling cone to mitigate the possibility of ladle preparation delay.

Ladle bubbling cone drawing jig according to an embodiment of the present invention for realizing the above object is pivotally rotatable to the main body, and a first portion of the main body having a towing portion protruding to be pulled into the hydraulic cylinder And a second arm connected to and having a first arm, the second arm pivotally connected to a second portion of the body and protruding in a direction toward the first protrusion.

First and second shafts may be further provided on the first and second portions to pivotally couple the first arm or the second arm to the main body.

A guide projecting from the main body may be further provided to extend between the first arm and the second arm.

First and second bolts formed on the first and second arms, respectively, and the first and second bolts are formed to engage the first and second bolts so as to elastically pull the first and second bolts toward each other. It may be further provided with an elastic band to be.

Ladle bubbling cone drawing method according to another embodiment of the present invention, preparing a jig for bubbling cone drawing of the ladle above, and the first arm and the second arm of the jig away from each other Widening, inserting the first protrusion of the first arm and the second protrusion of the second arm into the pair of receiving grooves of the bubbling cone, respectively; Operating to draw the bubbling cone from the ladle.

Before inserting the first protrusion of the first arm and the second protrusion of the second arm into the pair of receiving grooves of the bubbling cone, respectively, inserting the guide into the injection tube of the bubbling cone Can be preceded.

Prior to drawing the bubbling cone from the ladle, engaging the elastic band with the first bolt and the second bolt allows the first arm and the second arm to be resiliently retracted relative to one another. Can be preceded.

According to the ladle bubbling cone drawing jig according to the present invention configured as described above and the drawing method using the same, the jig is separated from the bubbling cone while uniformizing the force applied to the bubbling cone to dismantle the bubbling cone. Lower your chances of becoming.

This improves the workability of the draw for disassembly of the bubbling cone, thereby lowering the possibility of delaying the preparation of the ladle replaced with a new bubbling cone. As a result, the likelihood of an increase in the overall process time due to ladle preparation delay can also be lowered.

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 conceptual diagram illustrating a distribution form of molten steel M in the mold 30 and the adjacent portion of FIG. 2,
4A and 4B are perspective views illustrating a bubbling cone 95 installed on the bottom surface of the ladle 10 of FIG. 1.
5 is a perspective view showing a jig 100 according to an embodiment of the present invention used to draw the bubbling cone 95 of FIG. 4,
FIG. 6 is a perspective view illustrating a state in which the jig 100 of FIG. 5 clamps the bubbling cone 95.
7 is a flowchart illustrating a drawing method according to another embodiment of the present invention.

Hereinafter, a ladle bubbling cone drawing jig according to a preferred embodiment of the present invention and a drawing method using the same will be described in detail with reference to the accompanying drawings. In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description thereof 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 slabs, blooms 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 prevention of oxidative and nitrification of the molten metal in the mold 30, the insulation, and the non-metallic inclusions on the molten metal surface. 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 submerge 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 a point 85, 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.

The form of the molten steel M in the mold 30 and the part adjacent to it is demonstrated with reference to FIG. FIG. 3 is a conceptual diagram illustrating a distribution form of molten steel M in the mold 30 and adjacent portions of FIG. 2.

Referring to FIG. 3, a pair of discharge ports 25a are typically formed at the end side of the immersion nozzle 25 on the left and right sides of the drawing (in the form of the mold 30 and the immersion nozzle 25, the center line C is formed). Assuming that the reference is symmetrical, only the left side is shown in this drawing}.

The molten steel M discharged together with the argon (Ar) gas from the discharge port 25a draws a trajectory flowing in the upward direction A1 and downward direction A2 as indicated by arrows A1 and A2. do.

The powder layer 51 is formed on the upper part of the mold 30 by the powder supplied from the powder supplier 50. The powder layer 51 may include a layer present in a form in which the powder is supplied and a layer sintered by the heat of the molten steel M (sintered layer is formed closer to the unsolidified molten steel 82). Below the powder layer 51, a slag layer or a liquid fluidized layer 52 formed by melting powder by molten steel M is present. The liquid fluidized bed 52 maintains the temperature of the molten steel M in the mold 30 and blocks the ingress of foreign matter. A portion of the powder layer 51 solidifies at the wall surface of the mold 30 to form a lubrication layer 53. The lubrication layer 53 functions to lubricate the solidified shell 81 so as not to stick to the mold 30.

The thickness of the solidification shell 81 becomes thicker as it progresses along the casting direction. The portion where the mold 30 of the solidification shell 81 is positioned is thin, and an oscillation mark 87 may be formed according to the oscillation of the mold 30. The solidification shell 81 is supported by the support roll 60, and the thickness thereof is thickened by the spray 65 for spraying water. The solidification shell 81 may be thickened, and a bulging region 88 may be formed in which a portion protrudes convexly.

Now, the bubbling cone 95 installed on the bottom of the ladle 10 of FIG. 1 and the jig 100 for drawing it will be described.

Figure 4a is a perspective view showing a bubbling cone 95 is installed on the bottom surface of the ladle 10 of Figure 1, Figure 4b is a perspective view showing the upper bubbling cone (95).

Referring to the drawings, the mounting portion 11 for mounting the bubbling cone 95 is installed on the bottom or bottom of the ladle 10. The body of the bubbling cone 95 is fitted into the groove formed in the center of the mounting portion 11.

The bubbling cone 95 is installed to communicate with the inner space of the ladle 10 through the mounting portion 11 to supply argon (Ar) gas to the molten steel in the ladle 10. The bubbling cone 95, as its name, has a conical body. An injection tube 97 connected to the supply tube 98 of argon gas is formed under the bubbling cone 95. In the body surrounding the injection tube 97, a pair of receiving grooves 96 may be formed at positions opposite to each other.

A drawing jig is required to remove, disassemble and replace the bubbling cone 95 with the mounting portion 11 of the ladle 10 and replace with a new one. 5 is a perspective view showing a jig 100 according to one embodiment of the present invention used to draw the bubbling cone 95 of FIG. 4.

Referring to this figure, the jig 100 for drawing the bubbling cone 95 may include a main body 110, a first arm 120, and a second arm 130.

The main body 110 includes a first portion 111 and a second portion 112. The first arm 120 is installed in the first part 111, and the second arm 130 is installed in the second part 112. In addition, the main body 110 includes a tow portion 113 to which the hydraulic cylinder is fastened. In the present embodiment, the first portion 111, the second portion 112, and the traction portion 113 exemplarily forms a 'T'.

The first arm 120 is rotatably installed in the first portion 111 along one direction S about the first shaft 121. A portion of the first arm 120 protrudes from the first protrusion 122. The first bolt 125 may be connected to the first arm 120.

The second arm 130 is rotatably installed in the second part 112 along one direction S about the second shaft 131. A portion of the second arm 130 is formed with a second protrusion 132 protruding toward the first protrusion 122. In other words, the first protrusion 122 and the second protrusion 132 may protrude to face each other. The second bolt 135 may be connected to the second arm 130.

The guide 140 may protrude between the first portion 111 and the second portion 112 of the main body 110. The guide 140 may be formed to extend in a direction opposite to the direction in which the tow portion 113 extends from the main body 110.

FIG. 6 is a perspective view illustrating a state in which the jig 100 of FIG. 5 clamps the bubbling cone 95.

Referring to this figure, the first arm 120 and the second arm 130 of the jig 100 are pivoted toward the bubbling cone 95 in a state where they are separated from each other. This allows the first protrusion 122 of the first arm 120 and the second protrusion 132 of the second arm 130 to be accommodated in the pair of receiving grooves 96 of the bubbling cone 95, respectively. do. Thus, by using the first arm 120 and the second arm 130, the force applied to the bubbling cone 95 is not biased to either side.

Prior to this process, the guide 140 may be inserted into the injection tube 97 of the bubbling cone 95. The guide 140 prevents the jig 100 from being biased toward either side based on the extension axis of the injection tube 97.

The first bolt 125 and the second bolt 135 of the jig 100 may be engaged with the elastic band 150. In the elastic band 150, for example, an elastic body such as a spring forms a band, and the first band 125 and the second bolt 135 are pulled against each other. Thereby, the state in which the jig 100 clamps the bubbling cone 95 can be more firmly maintained.

Now, referring to FIG. 7 (and FIGS. 1 to 6), a drawing method of the bubbling cone 95 using the jig 100 according to another embodiment of the present invention will be described. 7 is a flowchart illustrating a drawing method according to another embodiment of the present invention.

For the ladle 10 receiving the molten steel, it is necessary to replace the bubbling cone 95 at regular intervals during the steelmaking operation. To this end, the ladle 10 is removed from the above operation, and also prepares the jig 100 described above (S1).

As described above, the prepared jig 100 is coupled to the bubbling cone 95 in the form of inserting the protrusions 122 and 132 into the receiving groove 96 (S2).

More rigid coupling between the jig 100 and the bubbling cone 95 may be required (S3). In such a case, it is first determined whether the protrusions 122 and 132 are inserted into the receiving groove 96 and fixed (S4). If the protrusions 122 and 132 are not already inserted into the receiving groove 96, the guide 140 may be inserted into the injection tube 97 of the bubbling cone 95 (S5). If the protrusions 122 and 132 are inserted into the receiving groove 96, the coupling of the jig 100 and the bubbling cone 95 may be strengthened by fastening the bolts 125 and 135 to the elastic band 150. It may be (S6).

When the coupling of the jig 100 and the bubbling cone 95 is completed, the hydraulic cylinder is coupled to the towing portion 113 of the jig 100, and the hydraulic cylinder is operated (S7). By the retraction operation of the hydraulic cylinder, the bubbling cone 95 is drawn from the ladle 10 while being bitten by the jig 100 (S8). After removing the used bubbling cone 95, a new bubbling cone may be installed in the ladle 10 to put the ladle 10 back into the steelmaking operation.

Such a ladle bubbling cone drawing jig and the drawing method using the same is not limited to the configuration and 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 15: shroud nozzle
20: tundish 25: immersion nozzle
30: mold 40: mold oscillator
50: powder feeder 51: powder layer
52: liquid fluidized bed 53: lubricating layer
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
95: bubbling cone 96: receiving groove
97: injection tube 100: jig
110: main body 111: first portion
112: second portion 120: first arm
121: first shaft 122: first protrusion
130: second arm 131: second shaft
132: second protrusion 140: guide
150: elastic band

Claims

A main body having a towing portion protruding to be pulled to the hydraulic cylinder;
A first arm pivotally connected to a first portion of said body, said first arm having a first protrusion; And
And a second arm pivotally connected to a second portion of the body, the second arm having a second protrusion projecting in a direction toward the first protrusion.

The method of claim 1,
And a first and second shafts respectively provided on the first and second portions to pivotally couple the first arm or the second arm to the main body, the ladle bubbling cone drawing jig.

The method of claim 1,
The jig for ladle bubbling cone drawing jig further comprising a guide protruding from the body to extend between the first arm and the second arm.

The method of claim 1,
First and second bolts formed on the first arm and the second arm, respectively; And
And a resilient band formed to engage the first ball and the second bolt, the elastic band allowing the first and second bolts to be elastically pulled toward each other.

Preparing a jig for drawing the ladle bubbling cone according to claim 1;
Spreading the first arm and the second arm of the jig away from each other;
Inserting a first protrusion of the first arm and a second protrusion of the second arm into a pair of receiving grooves of the bubbling cone, respectively; And
And drawing the bubbling cone out of the ladle by engaging the tow unit with a hydraulic cylinder and actuating the hydraulic cylinder.

The method of claim 5,
The ladle bubbling cone drawing jig further comprises a guide according to claim 3,
Before inserting the first protrusion of the first arm and the second protrusion of the second arm into the pair of receiving grooves of the bubbling cone, respectively, inserting the guide into the injection tube of the bubbling cone Preceding, bubbling cone drawing method of ladle.

The method of claim 5,
The ladle bubbling cone drawing jig further comprises the first and second bolts according to claim 4, and an elastic band,
Prior to drawing the bubbling cone from the ladle, engaging the elastic band with the first bolt and the second bolt allows the first arm and the second arm to be elastically pulled relative to one another. Preceding, bubbling cone drawing method of ladle.