KR20060076672A - Apparatus for getting back filler of open nozzle - Google Patents

Abstract

The foreign matter recovery apparatus of the open nozzle according to the present invention is a recovery drum of the hollow cylinder inclined at a predetermined angle and the top surface is open, a filler barrel attached to the recovery drum to extend in the longitudinal direction on the upper surface of the recovery drum; It is configured to include a moving means for moving the recovery drum, during the initial operation during the billet manufacturing process of the continuous casting process to prevent the filler to be introduced into the molten steel with the nozzle opening during mixing to occur during mixing It prevents the formation of stones, contributes to the stability and quality of the operation, and thus has the advantage of reducing the cost by improving the error rate by solving the problem of cutting and scrap of the cast.

Tundish, Nozzle, Filler, Molten Steel, Mold, Continuous Casting

Description

Apparatus for getting back filler of open nozzle}

1 is a schematic diagram illustrating a typical continuous casting plant.

2A to 2D are schematic diagrams showing a working situation of injecting molten steel into a mold using a conventional open nozzle;

Figure 3 is a photograph showing segregation caused by the injury of foreign matter when molten steel injection into the mold using a conventional open nozzle.

Figure 4 is a front view showing a foreign matter recovery apparatus of the open nozzle according to the present invention.

Figure 5 is a schematic diagram showing a situation of collecting the foreign matter using the foreign matter recovery apparatus of the open nozzle according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: ladle 2: tundish

3: tundish nozzle 4: mold

5: pinch roll 6: stopper

10: molten steel 11: filler

20: recovery drum 21: filler receiving

22: arm 23: upper socket                 

24: lower socket 25: floating support pin

26: fixing bolt

The present invention relates to a foreign matter recovery apparatus of the open nozzle, and more particularly, to recover the foreign matter of the open nozzle to prevent the filler injected into the open nozzle during the initial operation to start casting in the small-section billet manufacturing process flows into the mold Relates to a device.

In general, the continuous casting method eliminates casting, molding, cracking, and crushing of ingot cases and injects molten steel directly into the mold to cool them, compared to the method of making slabs or blooms through crushing rolling in conventional ingots. It is a method of producing slabs, blooms, billets and the like by solidifying continuously.

1 shows a typical continuous casting plant.

In the continuous casting facility, a tundish 2 is positioned at the bottom of the ladle 1 for transporting molten steel, and a tundish nozzle 3 is installed at the bottom of the tundish 2 to discharge molten steel. On the other hand, a mold 4 for producing molten steel as a billet having a predetermined thickness and width is installed at the lower part of the nozzle 3, and a plurality of pinch rolls 5 for guiding the billet is provided at the lower end of the mold 4. It is installed.

This continuous casting facility is made in such a way that the molten steel injected from above solidifies into the cross-sectional shape of the mold 4 as it flows down through the mold 4.

The molten steel with which the temperature is precisely adjusted is transported by the ladle 1 and injected into the inside of the tundish 2 through the tap hole formed under the ladle 1. In the tundish 2, the contents of the molten steel are separated and floated, and when the injection of the molten steel is completed, the molten steel is leaked by opening the tundish nozzle 3 installed at the bottom of the tundish 2. The molten steel flowing out at this time is injected into the mold 4 to produce a bilet having a predetermined thickness and width inside the mold 4, and then guides the plurality of pinch rolls 5 installed at the bottom of the mold 4. To receive and move.

Filler inside the tundish nozzle (3) to maintain the molten steel for a certain time for quality improvement and stable injection operation inside the tundish (2), and to open the nozzle (3) after the supply of molten steel is completed Is injecting.

2A to 2D are schematic diagrams showing a working situation of injecting molten steel into a mold by using a conventional tundish nozzle, and in a bilette continuous casting, the tundish nozzle is an open nozzle.

As shown in FIG. 2A, the lower part of the tundish nozzle 3 is closed by using the stopper 6 for the purpose of dwelling the molten steel 10 injected into the tundish 2 for a predetermined time after the preheating operation for the casting operation. After that, a certain amount of filler 11 is introduced into the upper portion. At this time, the filler 11 is put in the upper portion of the stopper 6 is to prevent the stopper 6 is melted by the molten steel 10 to prevent the molten steel 10 from falling straight down. Generally, the filler 11 used for sealing the nozzle 3 formed in the tundish 2 is used by mixing industrial sand and carbon.

The casting operation is started to inject molten steel 10 in the ladle 1 into the tundish 2 and a certain amount of molten steel 10 is filled in the tundish 2. As shown in FIG. 2B, when the stopper 6 closing the lower portion of the tundish nozzle 3 is removed, the filler 11 and the molten steel 10 start to flow out. At this time, as shown in FIG. 2C, the filler 11 inside the nozzle 3 flows into the mold 4 and the molten steel 10 flows in the secondary. Therefore, as shown in FIG. 2D, the billet is manufactured in a state in which the filler 11 is mixed in the molten steel 10 in the mold 4, thereby degrading its quality.

In addition, the filler 11 introduced into the mold 4 during the initial work is injected with molten steel 10 and floated upward due to the difference in specific gravity, leaving widespread segregation inside and outside of the billet. There is a risk of a break out. Here, the "break out" refers to a phenomenon in which the solidified layer is broken due to the inflow of foreign matter and the molten steel is leaked out. When this phenomenon occurs, an accident in which the molten steel and the equipment are welded is caused.

In fact, as can be seen in Figure 3 it can be seen that due to the incorporation of foreign matter in the molten steel, a wide range of segregation occurs.

In general, in order to solve the above quality problems caused by filler injury during the initial operation, each cast is cast and scraped about 4000 mm each time the casting is started. Due to segregation of the cast during post-process rolling operations, a large amount is additionally cut or scraped, which reduces the cast rate and causes a lot of losses.

The present invention is to solve the problems as described above, it occurs during the mixing to prevent the filler injected into the tundish during the billet manufacturing process of the continuous casting process is mixed in the molten steel when starting the casting with the nozzle opening. It is an object of the present invention to provide a foreign material recovery device of an open nozzle that prevents the formation of stones, thereby contributing to the stability and quality of the operation during the initial operation.

In order to achieve the above object, the present invention is a hollow drum recovery drum inclined at a predetermined angle and the top surface is open, a filler plate attached to the recovery drum to extend in the longitudinal direction on the upper surface of the recovery drum and It provides a foreign matter recovery apparatus of an open nozzle comprising a moving means for moving the recovery drum.

The moving means has an upper socket and the upper socket which have an arm extending from the recovery drum, a pipe into which the arm is horizontally inserted therein, and including a fixture for fixing the arm and a floating support pin extending downward. Floating support pin of the vertical insert is characterized in that it comprises a lower socket to enable the upper socket.

In addition, the filler receiving is characterized in that it comprises a paper.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the foreign matter recovery apparatus of the open nozzle according to the present invention.                     

4 is a front view showing the foreign matter recovery apparatus of the open nozzle according to the present invention.

Referring to the drawings, the foreign matter recovery apparatus of the open nozzle according to the present invention is a recovery drum 20, the filler receiving 21, the arm 22, the upper and lower sockets (23, 24), the flow support pin (25) It is configured to include. The filler base 21 is formed of paper, and all other parts can be made of steel.

The recovery drum 20 is installed at an inclined angle in the form of a hollow cylinder having an open top surface. The filler receiver 21 is formed by rolling paper into close contact with an inner side surface of the recovery drum 20, and extends to an upper portion of the recovery drum 20 using paper longer than the length of the recovery drum 20. Get out. In addition, as long as the desired area is secured by extending to the upper portion of the recovery drum 20, the filler receiver 21 may be configured in various forms such as a semi-circle or a rectangle, and the shape thereof is not limited. Since the filler receiver 21 is intended to receive the filler falling from the top and move it to the recovery drum 20, the filler receiver 21 includes a cross-sectional area in which the filler falls and must be stable to sufficiently receive the filler. In addition, the filler receiving 21 is incinerated by the molten steel that receives the filler and fills in the recovery drum 20 and then flows out, and thus, the assembly is easy and the material incinerated at the molten steel temperature may be used. Since it is consumable, it is preferable to use paper which is easy to replace and easy to assemble.

The pillar receiver 21 is positioned obliquely between the tundish nozzle 3 and the mold 4, the position of which is controlled by the arm 22 and the upper and lower sockets 23, 24.

The upper and lower sockets 23 and 24 are configured in the form of pipes. The upper socket 23 is assembled by inserting the arm 22 connected from the recovery drum 20, and can be assembled by adjusting the distance of the arm 22 freely including a fixing bolt 26 in the lower portion. Do. In addition to the fixing bolt 26, other fasteners may be used to fix the arm 22 in the upper socket 23. In addition, the lower socket 24 is standing vertically fixed and serves as a fixing part of the device. It can be fixed in the vicinity of the mold top. The lower socket 24 is assembled by being inserted into the floating support pin 25 vertically connected to the lower end of the upper socket 23, and the floating support pin 25 is rotatably mounted in the lower socket 24.

The operation of the foreign matter recovery apparatus of the open nozzle according to the present invention will be described below.

Figure 5 shows the situation of collecting the foreign matter using the foreign matter recovery apparatus of the open nozzle according to the present invention.

Referring to the drawings, after assembling the paper on the inner side of the recovery drum 20 to form the filler receiving 21, the recovery drum 20 is rotated to be positioned above the mold. At this time, the portion formed extending from the upper part of the collecting drum 20 of the filler base 21 is rotated so as to be located in the upper part of the mold. This secures the lower socket 24 in a suitable position near the top of the mold and can be positioned by adjusting the length of the arm 22 appropriately.

Referring to FIG. 2A, the lower portion of the tundish nozzle 3 is closed using the stopper 6, and then a certain amount of filler 11 is introduced into the upper portion of the tundish nozzle 3. When the casting operation is started by removing the stopper 6 which closed the lower portion of the tundish nozzle 3, the filler 11 and the molten steel 10 start to flow out to the lower portion. The filler 11 inside the nozzle 3 primarily flows into the mold 4, and the molten steel 10 flows into the secondary.

At this time, the filler 11 first flows out of the tundish nozzle 3, and the filler 11 collides with the filler base 21 located at the upper part of the mold and collects into the recovery drum 20. Thus, the filler 11 is collect | recovered by the collection | recovery drum 20, and the filler base 21 assembled inside the collection | recovery drum 20 by the molten steel 10 which flows out next is incinerated, and the collection drum 20 is recovered. ) Only the filler 11 remains inside. When the recovery of the filler 11 is completed, the recovery drum 20 installed in the upper part of the mold is rotated so as not to interfere with the casting operation. The recovered recovery drum 20 leaves the upper portion of the mold and molten steel is injected into the mold.

When repair or replacement is necessary due to damage to the recovery drum 20 or each component, the upper and lower sockets 23 and 24 can be easily disassembled and separated to repair or replace.

This process is continually repeated to prevent filler inflow and assembly of the filler plate using paper inside the recovery drum is simple and quick.

As mentioned above, although this invention was demonstrated in detail using the preferable Example, the scope of the present invention is not limited to a specific Example and should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

The foreign matter recovery apparatus of the open nozzle according to the present invention prevents the filler, which is introduced into the tundish during the initial operation during the billet manufacturing process of the continuous casting process, from being mixed into the molten steel together with the nozzle opening to prevent the generation of segregation generated during the mixing. In addition, it contributes to the stabilization and quality of the operation, which has the advantage of reducing the cost of cutting and scrap problems by improving the error rate.

Claims (3)

A recovery drum of the hollow cylinder inclined at a predetermined angle and having an open top surface; Filler tray attached to the recovery drum to extend in the longitudinal direction on the upper surface of the recovery drum; And An apparatus for recovering foreign matters from an open nozzle, comprising a moving means for moving the recovery drum. In claim 1, The means for moving, An arm extending from the recovery drum; An upper socket having a pipe in which the arm is inserted horizontally and including a fixture for fixing the arm and a downwardly extending flow support pin; And And a lower socket configured to vertically insert the flow support pin of the upper socket to rotate the upper socket. The method according to claim 1 or 2, The filler receiving is a foreign material recovery device of the open nozzle, characterized in that it comprises a paper.

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