KR102173169B1 - Equipment for casting and method for casting - Google Patents

Abstract

The casting facility according to an embodiment of the present invention has a first nozzle connected to a container, a second nozzle fastened to the first nozzle, and an interior space, and can be installed to surround a fastening portion between the first nozzle and the second nozzle, and It includes a monitoring housing that is light-transmitting so that the colored gas supplied to the gas can be identified, and a monitoring unit that determines a fastening state between the first nozzle and the second nozzle as normal or defective using the share of the colored gas in the monitoring housing.
Accordingly, according to embodiments of the present invention, after fastening the first nozzle and the second nozzle, the sealing property between the first nozzle and the second nozzle is monitored at the beginning of the casting operation. And, if it is determined that the fastening or sealing property between the first nozzle and the second nozzle is defective, a measure is taken or the casting operation is stopped.
Accordingly, it is possible to prevent continuing casting with poor fastening or sealing properties between the first nozzle and the second nozzle. Therefore, it is possible to prevent the molten steel from being re-oxidized due to the external air sucked into the fastening portion between the first nozzle and the second nozzle, or from continuing the casting in a state in which component gaps are occurring.

Description

Casting equipment and casting method {EQUIPMENT FOR CASTING AND METHOD FOR CASTING}

The present invention relates to a casting facility and a casting method, and more particularly, to a casting facility and a casting method capable of monitoring the hermeticity of a nozzle.

In general, a continuous casting facility is a facility that puts the molten steel produced in the steel making process in a ladle and moves it to the upper side of the tundish, supplies the molten steel in the ladle to the tundish, and supplies it as a mold to continuously produce cast iron of the desired size.

In order to supply molten steel in the ladle to the tundish, first connect the shroud nozzle, which is a means of supplying molten steel through the tundish, to the collector nozzle connected to the outlet of the ladle.If the ladle outlet is opened, the molten steel of the ladle is collected It passes through the nozzle and shroud nozzle and is supplied to the tundish.

However, a gap is generated between the collector nozzle and the shroud nozzle due to poor connection between the collector nozzle and the shroud nozzle, or a foreign substance caught between the collector nozzle and the shroud nozzle, and outside air is sucked through the gap.

Since the outside air contains oxygen and nitrogen, the outside air introduced into the inside oxidizes the molten steel flowing along the collector nozzle and the shroud nozzle to increase oxidative inclusions or reduce the content of solid Al (solid Al), It is a factor that causes an external component to increase the nitrogen content in molten steel.

Korean Patent Publication KR20160021587

The present invention provides a casting facility and a casting method capable of monitoring the hermeticity of a nozzle.

The present invention provides a casting facility and a casting method capable of monitoring the inflow of outside air through a nozzle fastening portion.

Casting equipment according to an embodiment of the present invention comprises a first nozzle connected to the container; A second nozzle engageable with the first nozzle; A monitoring housing having an internal space, installable to surround a fastening portion between the first nozzle and the second nozzle, and transmit light so that the colored gas supplied to the inside can be identified; And a monitoring unit that determines a fastening state between the first nozzle and the second nozzle as normal or defective by using the share of the colored gas in the monitoring housing.

The monitoring unit may include an imager capable of capturing an image inside the monitoring housing to obtain the image image; And a determination unit that compares the occupancy rate of the colored gas in the acquired image image with the reference occupancy rate, and determines a fastening state between the first nozzle and the second nozzle as normal or defective.

The monitoring unit includes an alarm unit that generates an alarm when the determination unit determines that it is defective.

A nozzle fastening device capable of supporting the second nozzle and fastening the second nozzle to the first nozzle; And a housing fastening part mounted on the nozzle fastening device, connected to the monitoring housing, and allowing the monitoring housing to surround a fastening portion between the first nozzle and the second nozzle.

The monitoring housing includes a plurality of bodies each having an inner space and one side of which is open.

The housing fastening part is a plurality of fastenings, each of which is connected to the body and the nozzle fastening device, and capable of horizontally movable in a direction opposite to a direction in which the first and second nozzles are mutually fastened and in a direction in which the plurality of bodies are arranged It includes a moving part.

The plurality of fastening moving parts move so that the openings of the plurality of bodies face each other and are connected to each other.

Each of the plurality of fastening moving parts rotates the body to adjust the angle of the body.

The monitoring housing includes a packing member installed to surround a peripheral wall of each of the plurality of bodies.

The container includes a ladle capable of receiving the molten steel, and the second nozzle is located under the ladle and is inserted into the tundish to receive the molten steel provided from the ladle, and the molten steel passing through the first nozzle Is supplied to the Tundish.

A casting method according to an embodiment of the present invention includes the process of fastening a second nozzle for discharging molten steel to a first nozzle mounted on a container; Disposing a light-transmitting monitoring housing to surround a fastening portion between the first nozzle and the second nozzle; Passing the molten steel through the first nozzle and the second nozzle; Supplying a colored gas into the monitoring housing; Calculating the share of the colored gas in the monitoring housing; And a monitoring process of comparing the occupancy rate of the colored gas with the reference occupancy rate, and determining a fastening state between the first nozzle and the second nozzle as normal or defective.

The monitoring process may include obtaining an image image by capturing the inside of the monitoring housing supplied with the colored gas; Calculating an occupancy rate of colored gas in the acquired image image; And comparing the calculated occupancy rate of the colored gas with a reference occupancy rate, and determining a fastening state between the first nozzle and the second nozzle as normal or defective.

In determining the fastening state between the first nozzle and the second nozzle as normal or defective, when the calculated share of the colored gas is greater than or equal to the reference share, the fastening state between the first nozzle and the second nozzle is determined as normal, When the calculated occupancy rate of the colored gas is less than the reference occupancy rate, it is determined that the fastening state between the first nozzle and the second nozzle is defective.

The process of calculating the occupancy rate of colored gas in the image image includes: counting the number of all pixels constituting the image image; Counting the number of colored pixels having the color of the colored gas among all the pixels; And calculating a ratio of the number of colored pixels among the total number of pixels.

In counting the number of colored pixels, comparing a saturation of each of the pixels with a reference saturation indicating a color of the colored gas; And a step of classifying and counting pixels included in the reference chroma range among the total pixel pixels as colored pixels.

And generating an alarm when it is determined that the fastening state between the first nozzle and the second nozzle is defective.

According to the nozzle monitoring apparatus according to an embodiment of the present invention, after the first nozzle and the second nozzle are coupled, the sealing property between the first nozzle and the second nozzle is monitored at the beginning of the casting operation. And, if it is determined that the fastening or sealing property between the first nozzle and the second nozzle is defective, a measure is taken or the casting operation is stopped.

Accordingly, it is possible to prevent continuing casting with poor fastening or sealing properties between the first nozzle and the second nozzle. Therefore, it is possible to prevent the molten steel from being re-oxidized due to the external air sucked into the fastening portion between the first nozzle and the second nozzle, or from continuing the casting in a state in which component gaps are occurring.

In addition, since the operator can check the flow of the colored gas in the monitoring housing while the monitoring housing surrounds the fastening portion between the first nozzle and the second nozzle, real-time monitoring is possible.

In addition, since the operator does not need to directly check the fastening portion between the first nozzle and the second nozzle, it can be safely monitored.

1 and 2 are views showing a continuous casting facility having a nozzle monitoring device according to an embodiment of the present invention
3 and 4 are three-dimensional views for explaining the operation of the housing fastening portion and the monitoring housing of the nozzle monitoring device according to an embodiment of the present invention
5 is an enlarged cross-sectional view showing a state in which a monitoring housing according to an embodiment of the present invention covers a fastening portion between a first nozzle and a second nozzle;
6 is a cross-sectional view of a state in which a monitoring housing according to an embodiment of the present invention covers a fastening portion between a first nozzle and a second nozzle as viewed from above
7 is a conceptual diagram illustrating an example of an image image inside a monitoring housing obtained from an imaging unit of a monitoring unit according to an embodiment of the present invention.
8 is a three-dimensional view showing a monitoring housing according to a modified example of the embodiment
9 is a cross-sectional view of a monitoring housing as viewed from above according to a modification of the embodiment
10 is a flow chart showing a casting method including a nozzle monitoring method according to an embodiment of the present invention

Hereinafter, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art. It is provided to be fully informed.

The present invention provides a nozzle monitoring apparatus and a casting method capable of monitoring the hermeticity of the nozzle. More specifically, the present invention relates to a nozzle monitoring device and a casting method capable of monitoring whether or not outside air is introduced through a nozzle fastening portion.

1 and 2 are views showing a continuous casting equipment provided with a nozzle monitoring device according to an embodiment of the present invention. 3 and 4 are three-dimensional views for explaining the operation of the housing fastening portion and the monitoring housing of the nozzle monitoring device according to an embodiment of the present invention. 5 is an enlarged cross-sectional view illustrating a state in which a monitoring housing according to an embodiment of the present invention covers a fastening portion between a first nozzle and a second nozzle. 6 is a cross-sectional view of a state in which a monitoring housing according to an embodiment of the present invention covers a fastening portion between a first nozzle and a second nozzle as viewed from above. 7 is a diagram conceptually illustrating an example of an image image inside a monitoring housing acquired by an imaging unit of a monitoring unit according to an embodiment of the present invention.

1 and 2, referring to FIG. 1, a continuous casting facility according to an embodiment of the present invention includes a ladle (L) for taking molten steel, a tundish (T) for temporarily receiving molten steel provided from the ladle (L). ), the first nozzle 100 mounted under the ladle L, the ladle L discharged through the first nozzle 100 by being fastened to connect between the first nozzle 100 and the tundish T The second nozzle 200 for supplying the inner molten steel to the tundish (T), the mold (M) for first solidifying the molten steel by receiving the molten steel from the tundish (T), at least the first nozzle 100 and the second It includes a nozzle monitoring device 7000 having a light-transmitting monitoring housing 7100 that can be installed to surround a portion where the nozzles 200 are interconnected or fastened, and monitor the inside of the colored gas introduced from the outside.

In addition, the continuous casting facility includes a nozzle fastening device 6000 for mutually coupling the first nozzle 100 and the second nozzle 200, an inert gas supply unit 80 for supplying an inert gas into the second nozzle 200, The immersion nozzle 50 that supplies molten steel in the tundish (T) to the mold (M), and is arranged in the casting direction from the lower side of the mold (M) to facilitate the movement of the cast pieces (S) drawn from the mold (M). It includes a guide roll 30 for rotational drive, and a spray nozzle 40 that is positioned between the two guide rolls 30 arranged in succession to spray coolant onto the cast steel (S).

The ladle (L) according to the embodiment is a kind of container that takes the molten steel that has been refined in the converter and provides it to the tundish (T).

The tundish (T) has an inner space for receiving the molten steel that is discharged from the ladle (L), and is a means for supplying the molten steel to the mold (M). This tundish (T) is a shape of a container having an inner space to accommodate molten steel.

Each of the ladle (L) and the tundish (T) may have a configuration in which an outer wall, which is an outermost part, is formed of iron skin, and an inner wall of the iron skin is protected by refractory.

The mold (M) is a means for casting the molten steel provided from the tundish (T) into a slab by first solidifying it.It has an inner space to accommodate the molten steel, and the molten steel is solidified inside the wall partitioning the inner space. A cooling means for circulating the refrigerant is provided.

The immersion nozzle 50 is used to supply molten steel of the tundish (T) to the mold (M), and is installed to connect the tundish (T) and the mold (M).

On the lower side of the mold (M), a plurality of guide rolls 30, each arranged in a row in the casting direction of the cast steel (S), and a plurality of guide rolls 30 are positioned between the guide rolls 30 to spray coolant to the cast steel (S). A spray nozzle 40 is installed. Accordingly, the cast piece S drawn from the lower side of the mold M is secondaryly solidified by the cooling water sprayed by the plurality of spray nozzles 40 while being conveyed in the arrangement direction of the plurality of guide rolls 30.

Hereinafter, as a container to which the first nozzle 100 and the second nozzle 200 are connected, a ladle (L) and a tundish (T) will be described as examples. However, the present invention is not limited thereto, and each of the first and second nozzles 100 and 200 may be connected to various containers having an internal space capable of accommodating the object to be treated.

The first nozzle 100 is a means for supplying the molten steel of the ladle L to the second nozzle 200, and is generally referred to as a collector nozzle in the art. The first nozzle 100 is formed to extend in the vertical direction therein to provide a passage through which molten steel can flow, the upper part is connected to the discharge hole provided in the lower part of the ladle L, and the lower part is a second nozzle ( 200). The lower portion of the first nozzle 100 is a portion fastened to the second nozzle 200, and the outer peripheral surface of the lower portion of the first nozzle 100 may be formed to have an inclination closer to the center in the width direction toward the lower side.

The second nozzle 200 is a means for supplying the molten steel provided from the first nozzle 100 to the tundish T, and is generally referred to as a shroud nozzle in the art. The second nozzle 200 is formed to extend in the vertical direction therein, and a passage through which the passage of the first nozzle 100 communicates is provided inside.

The upper portion of the passage of the second nozzle 200 is a portion to which the lower portion of the first nozzle 100 is inserted and fastened, and the inner wall surface of the upper portion corresponds to or coincides with the inclination of the outer peripheral surface of the lower portion of the first nozzle 100. It can be formed to have a slope. That is, the upper portion of the passage of the second nozzle 200 may be formed such that the inner diameter gradually decreases toward the lower side. Accordingly, the slope of the inner wall surface partitioning the upper portion of the passage in the second nozzle 200 may correspond to or coincide with the slope of the outer peripheral surface of the lower portion of the first nozzle 100.

The nozzle fastening device 6000 is a device that interconnects or fastens the first nozzle 100 and the second nozzle 200. The nozzle fastening device 6000 is located outside the ladle (L) and the tundish (T), is formed to extend in one direction, and is capable of horizontal movement, elevation, and rotation, an arm 6100 and an arm 6100. ) Is installed at the front end, that is, one end, and is connected to the bracket 6400 capable of gripping the second nozzle 200 and the rear end, that is, the other end of the arm 6100, to raise and lower the arm 6100. It is installed to connect between the lowering driving unit 6200, the arm 6100 and the elevating driving unit 6200, and includes a rotation driving unit 6300 for rotating the arm 6100.

The arm 6100 has one end connected to the elevating driving unit 6200, a first driving source 6110 providing horizontal movement driving force, and one end connected to the bracket 6400, and the other end connected to the first driving source 6110 And a beam 6120 capable of moving forward in the bracket 6400 direction or backward in the opposite direction according to the operation of the first driving source 6110.

The bracket 6400 is a means capable of gripping the second nozzle 200 and is mounted to one end of the arm 6100, more specifically, to one end of the beam 6120. The bracket 6400 according to the embodiment is a hollow type having an inner space so that the second nozzle 200 can be inserted or accommodated therein, and an opening through which the second nozzle 200 can pass is provided at one side.

The elevating drive unit 6200 adjusts the height of the arm 6100 by raising or lowering it. The elevating driving unit 6200 is a second driving source 6210 that provides an elevating driving force, one end is connected to the second driving source 6210 and the other end is connected to the arm 6100, the operation of the second driving source 6210 It includes an elevating rod 6220 that rises or descends by.

The rotation driving unit 6300 is a means for rotating the arm 6100 and is installed to connect the elevating driving unit 6200 and the arm 6100. Here, the rotation driving unit 6300 rotates in the circumferential direction of the elevating driving unit 6200 while the heights of the other end and one end of the arm 6100 are fixed, or the height of one end and the other end of the arm 6100 is variable. In other words, it may be a means that can rotate in the vertical direction, such as the motion of a seesaw.

On the other hand, in supplying the molten steel of the ladle (L) to the tundish (T), in order to reduce the oxidation of the molten steel in the second nozzle 200, an inert gas such as argon gas (Ar gas) into the second nozzle 200 ). That is, in order to seal the fastening portion between the first nozzle 100 and the second nozzle 200, the inert gas supply unit 80 is connected to the second nozzle 200, and the inert gas is supplied into the second nozzle 200. Supply.

However, even if an inert gas is supplied into the second nozzle 200, the fastening between the first nozzle 100 and the second nozzle 200 is poor, or between the first nozzle 100 and the second nozzle 200. When there is a gap due to a foreign substance or the like, outside air is sucked in through a fastening portion between the first nozzle 100 and the second nozzle 200. At this time, since molten steel and inert gas flow along the first nozzle 100 and the second nozzle 200, there is a pressure difference between the outside and the inside, and the outside air is caused by the pressure difference between the first nozzle 100 and the second nozzle. It is sucked into the fastening part between the nozzles 200.

The outdoor air introduced into the interior oxidizes the molten steel flowing along the first nozzle 100 and the second nozzle 200 to increase oxidative inclusions, reduce the content of solid Al (solid Al), or increase the nitrogen content. It generates external components such as letting go.

Accordingly, when the molten steel of the ladle L is supplied to the tundish T, it is necessary to monitor the sealing property between the first nozzle 100 and the second nozzle 200. More specifically, the first nozzle at the beginning of casting that starts to supply the molten steel of the ladle (L) to the tundish (T) after mutually fastening the first nozzle 100 and the second nozzle 200 to start casting. It is necessary to monitor the hermeticity between the (100) and the second nozzle (200). And, if it is determined that the sealing property is poor as a result of monitoring, the operator may stop supplying or operating molten steel.

The nozzle monitoring device 7000 according to the embodiment of the present invention is based on whether the colored gas supplied to the inside of the monitoring housing 7100 enters the fastening part between the first nozzle 100 and the second nozzle 200 and the amount of The airtightness between the first nozzle 100 and the second nozzle 200 is monitored by using the occupancy of the colored gas in the monitoring housing 7100 that varies accordingly.

Such a nozzle monitoring device 7000 is a monitoring housing 7100 that can be installed so as to surround a portion where at least the first nozzle 100 and the second nozzle 200 are interconnected or fastened, and colored inside the monitoring housing 7100. ) The colored gas supply unit 7200 that supplies the gas and the colored gas share inside the monitoring housing 7100 are calculated, and through this, the sealing property or the sealing state of the fastening part between the first nozzle 100 and the second nozzle 200 It includes a monitoring unit 7400 to determine.

In addition, the nozzle monitoring device 7000 is a housing fastening portion for fastening or mounting the monitoring housing 7100 so that the monitoring housing 7100 surrounds a portion where the first nozzle 100 and the second nozzle 200 are mutually fastened. 7300) may be included.

The monitoring housing 7100 has a cylindrical shape having a fastening portion between the first nozzle 100 and the second nozzle 200 and an inner space in which a colored gas is accommodated. In other words, the monitoring housing 7100 has an inner space so that the upper portions of the second nozzles 200 positioned at the lower and lower sides of the first nozzle 100 positioned at the upper side can each pass through, and the upper and lower sides are open. It may be a hollow shape.

More specifically, the monitoring housing 7100 includes a plurality of bodies 7110 and 7120 that can be mutually fastened and separated.

The monitoring housing 7100 according to the embodiment includes two bodies, that is, a first body 7110 and a second body 7120 as shown in FIGS. 3 to 6. Each of the first body 7110 and the second body 7120 has an inner space and has an open side.

When the monitoring housing 7100 is installed to surround the fastening portion between the first nozzle 100 and the second nozzle 200, one opening of the first body 7110 (hereinafter, the first opening 7111) and the first 2 The body 7120 is disposed so that one side opening (hereinafter, the second opening 7121) faces each other. Accordingly, the internal space of the first body 7110 and the internal space of the second body 7120 communicate with each other (see FIGS. 4 to 6 ).

In configuring the monitoring housing 7100, it is effective that the first body 7110 and the second body 7120 have mutually symmetrical shapes. However, the present invention is not limited thereto, and when the first body 7110 and the second body 7120 are interconnected or fastened, while partitioning a closed inner space, the first nozzle 100 and the second nozzle ( It is sufficient if it is a shape that can accommodate the fastening portion between 200).

The shape of the inner space of the monitoring housing 7100 may be rectangular as shown in FIGS. 5 and 6. However, the shape of the inner space is not limited thereto, and any shape in which a fastening portion between the first nozzle 100 and the second nozzle 200 can be accommodated, for example, may be circular.

Each of the above-described monitoring housing 7100, more specifically, the first and second bodies 7110 and 7120, is a light-transmitting material such as glass, quartz, plastic, etc. to enable identification of the color of the colored gas from the outside. It can be manufactured as

The monitoring housing 7100 according to the embodiment is composed of two bodies 7110 and 7120, but is not limited thereto, and may be composed of two or more bodies that can be separated and interconnected.

The colored gas supply unit 7200 supplies colored gas to the monitoring housing 7100, and has a colored gas storage unit 7210 that stores or provides a colored gas and one end is connected to the colored gas storage unit 7210 and the other end is monitored. It includes a colored gas supply pipe 7220 connected to the housing 7100.

The colored gas is a gas that exhibits a color by itself, and various colored gases such as red, blue, and yellow can be applied.

The housing fastening part 7300 is a means for mounting the monitoring housing 7100 so as to surround the fastening portions of the first nozzle 100 and the second nozzle 200.

3 and 4, the housing fastening part 7300 according to the embodiment grips each of the first and second bodies 7110 and 7120 of the monitoring housing 7100, and connects them to the first nozzle 100. It includes a first fastening part 7310 and a second fastening part 7320 that move to the fastening part of the second nozzle 200 so that the first body 7110 and the second body 7120 contact and connect to each other. do. In addition, the first and second fastening parts 7310 and 7320 may be connected to the arm 6100 of the nozzle fastening device 6000, and the first fastening part 7310 and the second fastening part 7320 may face each other. Or it can be arranged symmetrically.

More specifically, the first fastening part 7310 has one end connected to the arm 6100 of the nozzle fastening device 6000 and the other end connected to the first body 7110 a first fastening moving part 7311, a nozzle fastening device It is formed to extend in a direction crossing the extension direction of the arm 6100 and the first fastening moving part 7311 of 6000 and installed to connect between the arm 6100 and the first fastening moving part 7311, and the A first horizontal moving part 7312 providing a driving force so that the first fastening moving part 7311 can horizontally move in a direction crossing the arm 6100, and one end is connected to the first fastening moving part 7311, and the other end It is connected to the first body 7110 and includes a first rotating portion 7313 rotatable so that the angle of the first body 7110 can be adjusted.

The first fastening moving part 7311 is a first fastening driving part 7311b that provides a forward and backward driving force, and one end is connected to the first fastening driving part 7311b, and the other end is connected to the first rotating part 7313 to move backwards and forwards or It includes a first fastening movement member (7311a) that can be stretched.

The first horizontal moving part 7312 may be a guide rail, and the first fastening moving member 7311a may be configured to slide along the first horizontal moving part 7312.

The second fastening part 7320 may have the same configuration as the first fastening part 7310 described above. That is, the second fastening part 7320 has one end connected to the arm 6100 of the nozzle fastening device 6000 and the other end connected to the second body 7120, the second fastening moving part 7321, the nozzle fastening device 6000. ) Is formed to extend in a direction crossing the extension direction of the arm 6100 and the second fastening moving part 7321 and installed to connect between the arm 6100 and the second fastening moving part 7321, and the second A second horizontal moving part 7322 providing a driving force so that the fastening moving part 7321 can move horizontally in a direction crossing the arm, and one end connected to the second fastening moving part 7321, and the other end of the second body 7120 ) Is connected to, and includes a second rotating part 7323 rotatable so that the angle of the second body 7120 can be adjusted.

The second fastening moving part 7231 is a second fastening driving part 7321b providing a forward and backward driving force, and one end is connected to the second fastening driving part 7321b, and the other end is connected to the second rotating part 7323 to move backwards and forwards or It includes a second fastening movement member (7321a) that can be stretched.

The second horizontal moving part 7322 may be a guide rail, and the second fastening moving member 7231a may be configured to be slidable along the second horizontal moving part 7322.

The first fastening part 7310 and the second fastening part 7320 described above may be installed on the arm 6100 so as to be symmetrical to each other. That is, the first fastening moving part 7311 and the second fastening moving part 7321 are parallel to each other, the first horizontal moving part 7312 and the second horizontal moving part 7322 are parallel to each other, and the first rotating part ( 7313 and the second rotating part 7323 may be installed so as to be parallel to each other.

1 and 2, the monitoring unit 7400 calculates the share of colored gas by analyzing the image acquired from the imager 7410 and the imager 7410 capable of capturing the inside of the monitoring housing 7100. And a determination unit 7420 that compares the calculated occupancy and the reference occupancy to determine the fastening state between the first nozzle 100 and the second nozzle 200 as normal or defective.

Further, the monitoring unit 7400 may include an alarm unit 7430 that generates an alarm when the determination unit 7420 determines that it is defective.

As described above, the imager 7410 is a means capable of capturing an image of the inside of the monitoring housing 7100, and more specifically, may be a camera capable of acquiring an image capable of identifying a color.

The determination unit 7420 receives the image image obtained by the imager 7410 and calculates the occupancy rate of the color indicated by the colored gas on the image image. For example, an image image of a certain size captured by the imager 7410 is analyzed in pixel units, as shown in FIG. 7, to calculate the ratio of pixels showing the color of the supplied colored gas among all pixels. By doing so, the occupancy rate of the color indicated by the colored gas can be calculated.

In more detail, first, the number of colored pixels having a color of a colored gas is counted among the total number of pixels constituting an image image. Then, when the ratio of the number of colored pixels among the total number of pixels is calculated, the occupancy of the colored gas in the image image is calculated.

In a more specific example, when the total number of pixels in the image image captured by the imager 7410 is 100 pixels, the number of colored pixels representing the color represented by the colored gas, for example, red If is 80, the share of colored gas in the monitoring housing 7100 is calculated as 80%.

In counting the number of colored pixels in the determination unit 7420, a reference saturation is used, and the reference saturation is a color representing a colored gas and may be a range value.

In more detail, the determination unit 7420 compares the saturation of each of the pixels with the reference saturation. Then, the pixels included in the reference saturation range among all the pixel pixels are classified as colored pixels, and the pixels are counted. Next, by calculating the ratio of the number of colored pixels among the total number of pixels, the share of the colored gas in the image image is calculated.

On the other hand, when the connection between the first nozzle 100 and the second nozzle 200 is poor, the gas flowing into the monitoring housing 7100 is passed through the fastening portion between the first nozzle 100 and the second nozzle 200. It will be sucked or introduced inside. In addition, the colored gas remaining in the monitoring housing 7100 decreases as the amount of colored gas sucked into the fastening portion between the first nozzle 100 and the second nozzle 200 decreases, so the colored gas in the monitoring housing 7100 The share will decrease.

The determination unit 7420 uses the occupancy of the colored gas in the monitoring housing 7400 which is variable for the above-described reason, and the fastening state or sealing property between the first nozzle 100 and the second nozzle 200 is determined to be normal or bad. Judge. That is, the determination unit 7420 determines that the airtightness between the first nozzle 100 and the second nozzle 200 is normal when the calculated share of the colored gas is more than the reference share, and the calculated share of the colored gas is less than the reference share. If so, it is judged as a bad connection.

The reference occupancy may be, for example, 80%, and when the calculated occupancy of the colored gas is 80% or more, the determination unit 7420 determines the fastening between the first nozzle 100 and the second nozzle 200 as normal. Conversely, when the calculated occupancy rate of the colored gas is less than 80%, it is determined that the fastening between the first nozzle 100 and the second nozzle 200 is defective.

The alarm unit 7430 generates an alarm according to the result of the determination unit 7420. That is, when the determination unit 7420 determines that the fastening state or sealing property between the first nozzle 100 and the second nozzle 200 is defective, an alarm is generated. When an alarm occurs, the operation can be terminated at the discretion of the operator.

8 is a three-dimensional view showing a monitoring housing according to a modified example of the embodiment. 9 is a cross-sectional view of a monitoring housing as viewed from above according to a modified example of the embodiment.

In the above, it has been described that the monitoring housing 7100 includes a first body 7110 and a second body 7120. However, the present invention is not limited thereto, and as shown in FIGS. 8 and 9, the monitoring housing 7100 may include a packing portion 7130 for packing a connection portion between the plurality of bodies 7110 and 7120.

The packing part 7130 is a means for inhibiting or preventing the colored gas introduced for the hermeticity test from flowing out or out of the monitoring housing 7100. The packing part 7130 may be disposed to surround a connection portion between the first body 7110 and the second body 7120.

More specifically, the packing portion 7130 includes a first packing member 7131 installed along an inner wall surface of the first body 7110 around the first opening 7111 and a second body 7120 around the second opening 7121. ) And a second packing member 7132 installed along the inner wall surface of).

Accordingly, when the first body 7110 and the second body 7120 are in contact or connected to each other so that the first opening 7111 and the second opening 7121 face each other, the first packing member 7131 and the first 2 The packing members 7132 are connected to be in contact with each other. For this reason, it is possible to suppress or prevent the colored gas flowing into the monitoring housing 7100 from flowing out.

The first and second packing members 7131 and 7132 are preferably made of a soft material, and may be, for example, rubber. Of course, the first and second packing members 7131 and 7132 are not limited to rubber, and various materials and means capable of sealing or packing are applied to suppress or prevent the outflow of the colored gas in the monitoring housing 7100 to the outside. I can.

On the other hand, the first body 7110 and the second body 7120 are in contact with each other or are connected to each other while being supported by the first and second fastening parts 7310 and 320 of the housing fastening part 7300 during monitoring. Since it is pressurized to be in contact or connected state, it is possible to suppress the colored gas supplied to the inside from escaping to the outside. Accordingly, the configuration of the packing unit 7130 described above may be omitted.

Hereinafter, an operation and a casting method of a casting facility according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7 and 10.

10 is a flow chart showing a casting method including a nozzle monitoring method according to an embodiment of the present invention.

The ladle (L) in which the molten steel after refining has been completed is moved to the upper side of the tundish (T). Then, the second nozzle 200 is fastened to the first nozzle 100 mounted on the ladle L using the nozzle fastening device 6000 (S100).

To this end, first, the second nozzle 200 located outside the ladle L and the tundish T is gripped using the bracket 6400. To this end, the arm 6100 is raised, lowered or rotated using at least one of the elevating driver 6200 and the rotation driving unit 6300, or by operating the first driving source 6110 to move the arm 6100 forward or By moving backward, the bracket 6400 is moved toward the second nozzle 200. At this time, with the opening of the bracket 6400 facing the second nozzle 200, the bracket 6400 is advanced toward the second nozzle 200, so that the second nozzle 200 passes through the opening. Come into the bracket (6400). Accordingly, the second nozzle 200 is gripped by the bracket 6400.

Thereafter, the second nozzle 200 held by the bracket 6400 is positioned under the first nozzle 100. To this end, at least one of the elevating driving unit 6200, the rotation driving unit 6300, and the first driving source 6110 is operated so that the second nozzle 200 is positioned below the first nozzle 100.

When the second nozzle 200 is located under the first nozzle 100, the arm 6100 is moved forward or backward so that the second nozzle 200 is positioned directly under the first nozzle 100.

And, by using at least one of the elevating driving unit 6200 and the rotation driving unit 6300 to raise the arm and bracket 6400 in the direction of the first nozzle 100, the second nozzle 200 supported by the bracket 6400 ) To the first nozzle 100. That is, the lower portion of the first nozzle 100 is inserted into the upper opening of the second nozzle 200, so that the first nozzle 100 and the second nozzle 200 are connected to each other.

In this way, when the first nozzle 100 and the second nozzle 200 are fastened, the housing fastening part 7300 is operated to surround the fastening part between the first nozzle 100 and the second nozzle 200. 7100) is placed (S200).

More specifically, by moving each of the first and second fastening moving parts 7311 and 7321 forward to the positions of the first and second nozzles 100 and 200, the first fastening moving part 7311 is connected to the first fastening moving part 7311. The second body 7120 connected to the first body 7110 and the second fastening moving part 7321 is positioned opposite to the fastening portion between the first nozzle 100 and the second nozzle 200.

In addition, the first and second fastening moving parts 7311 and 7321 are respectively moved in a direction in which the first body 7110 and the second body 7120 are arranged using the first and second horizontal moving parts 7312 and 7322. Move horizontally. At this time, the first body 7110 and the second body 7120 are horizontally moved in a direction closer to each other, so that the first body 7110 and the second body 7120 are in contact or connected to each other.

When the first body 7110 and the second body 7120 are connected to each other, as shown in FIGS. 4 to 6, the first body 7110 and the second body 7120 A fastening portion between the 1 nozzle 100 and the second nozzle 200 is accommodated.

When the monitoring housing 7100 is mounted so as to surround the fastening portion between the first nozzle 100 and the second nozzle 200, casting is started by opening the discharge hole of the ladle L (S300).

When the discharge hole of the ladle L is opened, the molten steel in the ladle L passes through the first nozzle 100 and the second nozzle 200 and is supplied to the tundish T, at this time, the inert gas supply unit 80 By using an inert gas, such as argon gas, is supplied to the second nozzle 200. The molten steel supplied to the tundish T through the second nozzle 200 is supplied to the mold M through the immersion nozzle 50 and solidified.

When the molten steel in the ladle L starts to be supplied to the second nozzle 200 through the first nozzle 100, the fastening state, that is, the sealing property between the first nozzle 100 and the second nozzle 200 is checked.

To this end, first, a colored gas is supplied to the monitoring housing 7100 using the colored gas supply unit 7200 (S400). When the colored gas is supplied to the monitoring housing 7100, the inert gas supplied to the second nozzle 200 is lowered to 30% or less of the flow rate when the colored gas is not supplied.

On the other hand, when the colored gas is supplied to the monitoring housing 7100, when the flow rate of the inert gas supplied to the second nozzle 200 exceeds 30% of the flow rate when the colored gas is not supplied, the first nozzle 100 ) And the second nozzle 200 is poorly fastened and there is a gap, it may be difficult for the colored gas to flow through the fastening portion of the fastening between the first nozzle 100 and the second nozzle 200.

When a colored gas is supplied to the monitoring housing 7100, an image of the inside of the monitoring housing 7100 is captured using an imager 7410 to obtain an image image (S500).

In addition, the determination unit 7420 receives the image image obtained by the imager 7410 and calculates the occupancy rate of the color indicated by the colored gas on the image image (S600). As a more specific example, the number of colored pixels representing a color, for example, red, represented by a colored gas on an image image captured by the imaging device 7410 is detected to calculate the occupancy of the colored gas in the monitoring housing 7100.

In addition, the determination unit 7420 compares the calculated share of the colored gas and the reference share (S700).

When the calculated occupancy rate of the colored gas is less than the reference occupancy rate, the determination unit 7420 determines this as a fastening failure, and transmits this signal to the alarm unit 7430 to generate an alarm (S820). When an alarm occurs, the operation can be terminated at the discretion of the operator.

However, on the contrary, when the calculated share of the colored gas is more than the reference share, it is determined that the airtightness between the first nozzle 100 and the second nozzle 200 is normal, and the cast iron casting operation is continued (S810).

Checking the sealing property of the nozzle fastening part as described above is to start supplying the molten steel of the ladle (L) to the tundish (T) after the first nozzle (100) and the second nozzle (200) are mutually fastened to start casting. It can be carried out at the beginning of casting.

In addition, in the continuous casting of the cast steel, since the casting is performed by continuously supplying molten steel in a plurality of ladles L to a tundish, it is possible to check the sealing property of the nozzle fastening portion every time the ladle L is replaced.

In this way, in the embodiment of the present invention, after the first nozzle 100 and the second nozzle 200 are coupled, the sealing property between the first nozzle 100 and the second nozzle 200 is monitored at the beginning of the casting operation. And, if it is determined that the fastening or sealing property between the first nozzle 100 and the second nozzle 200 is defective, a measure is taken or the casting operation is stopped.

Accordingly, it is possible to prevent continuing casting with poor fastening or sealing properties between the first nozzle 100 and the second nozzle 200. Accordingly, it is possible to prevent the molten steel from being re-oxidized due to the external air sucked into the fastening portion between the first nozzle 100 and the second nozzle 200 or from continuing the casting in a state in which component gaps are occurring.

In addition, since the operator can check the flow of the colored gas in the monitoring housing 7100 while the monitoring housing 7100 surrounds the fastening portion between the first nozzle 100 and the second nozzle 200, real-time monitoring is possible. Do.

In addition, since the operator does not need to directly check the fastening portion between the first nozzle 100 and the second nozzle 200, it is possible to safely monitor.

100: first nozzle 200: second nozzle
6000: nozzle fastening device 6100: arm
6400: bracket 7000: nozzle monitoring device
7100: monitoring housing 7110: first body
7120; Second body 7300: housing fastening part
7311: first fastening moving part 7312: horizontal moving part
7321: second fastening moving part 7322: second fastening moving part

Claims (16)

A first nozzle connected to the container;
A second nozzle engageable with the first nozzle;
A monitoring housing having an internal space, installable to surround a fastening portion between the first nozzle and the second nozzle, and transmit light so as to identify a colored gas supplied to the inside;
A monitoring unit that determines a fastening state between the first nozzle and the second nozzle as normal or defective using the share of the colored gas in the monitoring housing;
A nozzle fastening device having an arm extending in one direction and a bracket mounted on a front end of the arm to support the second nozzle, and fastening the second nozzle to the first nozzle;
A housing fastening part mounted on the nozzle fastening device, connected to the monitoring housing, and allowing the monitoring housing to surround a fastening portion between the first nozzle and the second nozzle;
Including,
The monitoring housing includes a plurality of bodies each having an inner space and one side of which is open,
The housing fastening part has one end connected to the arm and the other end connected to the body, so as to move horizontally in a direction opposite to the direction in which the mutually fastened first and second nozzles are located and in a direction in which the plurality of bodies are arranged Casting equipment comprising a plurality of possible fastening movements. The method according to claim 1,
The monitoring unit,
An imager capable of capturing an image inside the monitoring housing to obtain an image image;
A determination unit that compares the occupancy rate of the colored gas in the acquired image image with a reference occupancy rate, and determines a fastening state between the first nozzle and the second nozzle as normal or defective;
Casting equipment comprising a. The method according to claim 2,
Casting equipment including an alarm unit for generating an alarm when the monitoring unit is determined to be defective by the determination unit. delete delete delete The method according to claim 1,
Casting equipment for moving the plurality of fastening moving parts so that the openings of the plurality of bodies face each other and are interconnected. The method according to claim 1,
Each of the plurality of fastening moving parts rotates the body to adjust the angle of the body. The method according to claim 1,
The monitoring housing includes a packing member installed to surround a peripheral wall of the opening of each of the plurality of bodies. The method according to any one of claims 1 to 3 and 7 to 9,
The container includes a ladle capable of receiving molten steel,
The second nozzle is located below the ladle, is inserted into the tundish to receive the molten steel provided from the ladle, and supplies the molten steel that has passed the first nozzle to the tundish. Fastening a second nozzle for discharging molten steel to a first nozzle mounted on the container;
Arranging a monitoring housing including a first body and a second body that are light-transmitting and face each other to surround a fastening portion between the first nozzle and the second nozzle;
Passing the molten steel through the first nozzle and the second nozzle;
Supplying a colored gas into the monitoring housing;
Calculating the share of the colored gas in the monitoring housing;
A monitoring process of comparing the occupancy rate of the colored gas with the reference occupancy rate, and determining a fastening state between the first nozzle and the second nozzle as normal or defective;
Including,
The process of fastening the second nozzle to the first nozzle,
Gripping the second nozzle at the tip of the arm;
Fastening the second nozzle to the first nozzle by horizontally moving the arm to the position of the first nozzle;
Including,
The process of disposing a monitoring housing having a first body and a second body facing each other so as to surround a fastening portion between the first nozzle and the second nozzle,
Moving the first and second bodies respectively connected to the arm in the direction of the first nozzle and the second nozzle;
Horizontally moving the first and second bodies in a direction crossing the extension direction of the arm in a direction in which the first body and the second body are close to each other;
Casting method comprising a. The method of claim 11,
The monitoring process,
Obtaining an image image by photographing the inside of the monitoring housing supplied with the colored gas;
Calculating an occupancy rate of colored gas in the acquired image image; And
Comparing the calculated occupancy rate of the colored gas with a reference occupancy rate, and determining a fastening state between the first nozzle and the second nozzle as normal or defective;
Casting method comprising a. The method of claim 12,
In determining the fastening state between the first nozzle and the second nozzle as normal or defective,
When the calculated occupancy rate of the colored gas is greater than or equal to the reference occupancy rate, the fastening state between the first nozzle and the second nozzle is determined as normal,
When the calculated occupancy rate of the colored gas is less than the reference occupancy rate, a casting method for determining a fastening state between the first nozzle and the second nozzle as a defect. The method of claim 12,
The process of calculating the share of the colored gas in the image image,
Counting the total number of pixels constituting the image image;
Counting the number of colored pixels having the color of the colored gas among all the pixels; And
Calculating a ratio of the number of colored pixels among the total number of pixels;
Casting method comprising a. The method of claim 14,
In counting the number of colored pixels,
Comparing the saturation of each of the pixels with a reference saturation representing the color of the colored gas; And
Classifying and counting pixels included in the reference saturation range among the total pixels as colored pixels;
Casting method comprising a. The method of claim 11,
And generating an alarm when the fastening state between the first nozzle and the second nozzle is determined to be defective.

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