KR101230188B1 - Casting apparatus - Google Patents

Abstract

The casting apparatus according to the present invention includes a tundish for receiving molten steel, a nozzle coupled to the tundish, a mold for receiving and casting the molten steel from the tundish through the nozzle, and heating to generate the microwave to heat the nozzle. Member. Therefore, the nozzle is heated by the microwaves generated from the heating apparatus to easily melt a material that hinders the flow of molten steel passing through the nozzle.

Description

Casting Apparatus {CASTING APPARATUS}

The present invention relates to a casting apparatus, and more particularly, to a casting apparatus in which nozzle clogging is prevented and productivity is improved.

Casting apparatus is a device for casting molten steel provided from the tundish into a cast of a constant size using a mold. In order to provide the molten steel contained in the tundish to the mold side without exposure to the atmosphere, the casting apparatus includes a nozzle formed of hard alumina or spinel refractory to connect the tundish and the mold.

Meanwhile, molten steel and a substance in the molten steel may be chemically reacted with the refractory constituting the nozzle to adhere to the inner wall of the nozzle. In this case, a phenomenon in which molten steel passing through the nozzle solidifies or adheres to the inner wall of the nozzle may be promoted. Accordingly, the flow of molten steel passing through the nozzle may not be smooth, and thus productivity of the cast steel may be reduced.

An object of the present invention is to provide a casting device that can prevent the clogging phenomenon of the nozzle by providing a heating member for heating the nozzle.

Casting apparatus for achieving the above object of the present invention, a tundish for receiving molten steel, a nozzle coupled to the tundish, a mold for receiving and casting the molten steel from the tundish through the nozzle, adjacent to the nozzle And a heating member that generates microwaves to heat the nozzle, and a detection device that is exposed to the outside and detects the microwaves. When the detection device detects the microwaves leaking to the outside, the operation of the heating member is stopped. Can be interrupted.

In addition, in the embodiment of the present invention, the heating member may further include a heat insulating member surrounding the nozzle to insulate the nozzle and a blocking member disposed outside the heating member to block the microwave leaked to the outside. The heating member may be disposed adjacent to the outer wall of the nozzle between the insulating member and the nozzle.

In addition, in the embodiment of the present invention, the heating member may be provided in plural, and in this case, the plurality of heating members may be arranged along the longitudinal direction of the nozzle.

In another embodiment of the present invention, the casting apparatus may further include a detection device and a temperature sensing device. The detection device detects a microwave leaking to the outside spaced apart from the heating member with the blocking member therebetween, the temperature sensing device detects the temperature of the nozzle.

According to the casting apparatus of the present invention, the heating apparatus can easily melt a material that is formed on the inner wall of the nozzle by using a microwave to block the flow of molten steel passing through the nozzle. Accordingly, clogging of the nozzle can be prevented and productivity of the casting apparatus can be improved.

1 is a view showing a casting apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the nozzle heating unit illustrated in FIG. 1.
3 is an enlarged cross-sectional view of a nozzle heating unit of a casting apparatus according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention and other matters required by those skilled in the art will be described in detail with reference to the accompanying drawings. However, the present invention may be embodied in various different forms within the scope of the claims, and thus the embodiments described below are merely exemplary, regardless of expression.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. It should be noted that the same elements in the drawings are represented by the same reference numerals and symbols as much as possible even though they are shown in different drawings. In addition, the thickness and size of each layer in the drawings may be exaggerated for convenience and clarity, and may differ from actual layer thicknesses and sizes.

1 is a view showing a casting apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the casting device 100 is a device for continuously casting a cast steel 8 of stainless steel by casting molten steel 5. The configuration of the casting apparatus 100 and the process of casting the cast piece 8 by the casting apparatus 100 will be described as follows.

The casting apparatus 100 is a ladle (1), long nozzle (11), tundish (10), immersion nozzle (15), nozzle heating part (40), mold (50), transfer rolls (60) and cooling water And a feeder 70.

The ladle 1 is filled with molten steel 5 which has been refined, and the molten steel 5 filled in the ladle 1 is provided to the tundish 10 through the long nozzle 11. The tundish 10 serves as a buffer for temporarily storing the molten steel 5 between the ladle 1 and the mold 50, and the molten steel 5 accommodated in the tundish 10 is the immersion nozzle. Through 15 is provided to the mold 50 side.

The molten steel 5 provided on the mold 50 side is cast into the cast steel 8 by the mold 50 and the primary cooling is performed on the cast steel 8. Thereafter, the slab 8 is conveyed by the conveying rolls 60, more specifically, the slab 8 withdrawn from the mold 50 is conveyed by the conveying rolls 60. While descending to the ground side, on the side the cast piece 8 is lowered in a vertical curved shape parallel to the first direction (D1).

In addition, while the cast piece 8 is transported by the feed rolls 60, the cast piece 8 is secondarily cooled by the coolant discharged from the coolant supply devices 70.

In general, the immersion nozzle 15 may be formed of hard alumina or spinel refractory containing carbon. In this case, the molten steel 5 passing through the immersion nozzle 15 and the nonmetallic inclusions present in the molten steel 5 chemically react with a material constituting the immersion nozzle 15 to form a composite layer (see FIG. 2). 12) can be formed. The composite layer may be formed on the inner wall of the immersion nozzle 15 to hinder the flow of the molten steel 5 passing through the immersion nozzle 15. However, in the embodiment of the present invention, the nozzle heating portion 40 is arranged to surround the immersion nozzle 15, the nozzle heating portion 40 heats the immersion nozzle 15 and at the same time to keep warm . As a result, the composite layer may be melted to smoothly flow the molten steel 5 passing through the immersion nozzle 15. A more detailed description of the structure of the nozzle heating unit 40 is as follows.

FIG. 2 is an enlarged cross-sectional view of the nozzle heating unit illustrated in FIG. 1. Meanwhile, in describing FIG. 2, components described above with reference to FIG. 1 are denoted by reference numerals, and redundant descriptions of the components are omitted.

Referring to FIG. 2, the nozzle heating unit 40 is formed to surround the outer wall of the immersion nozzle 15. The nozzle heating part 40 includes a plurality of heating members 20, a plurality of insulating members 30, and a blocking member 35.

The heating members 20 may be arranged along the longitudinal direction of the immersion nozzle 15, and each of the heating members 20 generates microwaves to heat the immersion nozzle 15. Accordingly, the composite layer 12 may be melted by being adhered to the inner wall of the immersion nozzle 15 to prevent the flow of the molten steel 5 passing through the immersion nozzle 15.

In the embodiment of the present invention, the nozzle heating portion 40 heats the immersion nozzle 15 to about 1300 ℃ to 2000 ℃, the frequency of the microwave generated by each of the heating members 20 is 2,400MHz to It can be set within the 2500MHz range.

The insulating members 30 are formed to surround the immersion nozzle 15 and the heating members 20. The insulating members 30 may include a material having a high melting point such as alumina to insulate the immersion nozzle 15 so that heat for heating the immersion nozzle 15 is prevented from being emitted to the outside.

In addition, the blocking member 35 is provided at the outermost side of the nozzle heating unit 40 to block microwaves generated from the heating members 20. Accordingly, the microwaves may be prevented from leaking to the outside by the blocking member 35, and thus, the working environment may be prevented from being disturbed due to the leakage of the microwaves.

3 is an enlarged cross-sectional view of a nozzle heating unit of a casting apparatus according to another embodiment of the present invention. Meanwhile, in describing FIG. 3, components described above with reference to FIGS. 1 and 2 are denoted by reference numerals, and redundant descriptions of the components are omitted.

Referring to FIG. 3, the nozzle heating unit 41 of the casting apparatus 101 may include the detection device 38 and the temperature sensing unit as components other than the heating members 20, the thermal insulation members 30, and the blocking member 35. The apparatus 39 further includes.

The detection device 38 is spaced apart from the heating members 20 by the blocking member 35, and the detection device 38 is disposed outside the blocking member 35 to expose the outside to the heating. Detects microwaves emitted from the members 20. Therefore, microwaves that are not blocked by the blocking member 35 and leaked to the outside may be detected by the detecting device 38.

The temperature sensing device 39 is disposed adjacent to the immersion nozzle 15 to sense the temperature of the immersion nozzle 15. Accordingly, it is possible to frequently check whether the immersion nozzle 15 is heated at 1300 ° C. to 2000 ° C. by using the temperature sensing device 39.

In the embodiment of the present invention, the temperature sensing device 39 may be a pyrometer capable of measuring the temperature of the immersion nozzle 15 even though the immersion nozzle 15 is not in direct contact with the immersion nozzle 15.

On the other hand, although not shown in Figure 3, the detection device 38 and the temperature sensing device 39 is a control unit for controlling the driving of the alarm device (not shown) or the nozzle heater 41 for generating an alarm sound ( It may work in conjunction with (not shown). Therefore, when the microwave leaks to the outside or the immersion nozzle 15 is overheated, the alarm device may be set to generate an alarm sound so that an operator can easily check the operation state, and the control unit may set the nozzle. It may be set to automatically stop the operation of the heating section 41.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention.

5: molten steel 10: tundish
20: heating members 30: insulating members
35: blocking member 40: nozzle heating portion
15: immersion nozzle 100: casting apparatus

Claims (7)

A tundish for receiving molten steel;
A nozzle coupled with the tundish;
A mold receiving and casting the molten steel from the tundish through the nozzle;
A heating member disposed adjacent to the nozzle and generating microwaves to heat the nozzle; And
A detection device exposed to the outside to detect the microwaves;
Including,
Casting device characterized in that the operation of the heating member is stopped when the detection device detects the microwave leakage to the outside. The method of claim 1,
A heat insulating member surrounding the nozzle to heat the nozzle; And
Casting device characterized in that it further disposed on the outside of the heating member for blocking the microwave leakage to the outside. The method of claim 2,
The heating member is caster, characterized in that disposed between the insulating member and the nozzle adjacent to the outer wall of the nozzle. 4. The casting apparatus according to claim 3, wherein the heating member is provided in plurality, and the plurality of heating members are arranged along a length direction of the nozzle. The method of claim 2,
The detection device is spaced apart from the heating member with the blocking member therebetween,
Casting apparatus characterized in that it further comprises a temperature sensing device for sensing the temperature of the nozzle. The apparatus of claim 1, wherein the nozzle is heated to 1300 ° C. to 2000 ° C. by the heating member. The casting apparatus according to claim 6, wherein the microwave frequency is 2,400 MHz to 2500 MHz.

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