KR101755401B1 - Visualization apparatus surface level of molten steel and visualization method for surface level of molten steel using the same - Google Patents

Visualization apparatus surface level of molten steel and visualization method for surface level of molten steel using the same Download PDF

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KR101755401B1
KR101755401B1 KR1020150111163A KR20150111163A KR101755401B1 KR 101755401 B1 KR101755401 B1 KR 101755401B1 KR 1020150111163 A KR1020150111163 A KR 1020150111163A KR 20150111163 A KR20150111163 A KR 20150111163A KR 101755401 B1 KR101755401 B1 KR 101755401B1
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molten steel
row
thermometers
rows
mold
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KR1020150111163A
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Korean (ko)
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KR20170017358A (en
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조현진
한상우
진선용
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention relates to a bath surface visualization apparatus and a bath surface visualization method using the bath surface visualization apparatus. The bath surface visualization apparatus comprises a plurality of thermometers for measuring the temperature of molten steel inserted into a mold in which molten steel is received, The plurality of thermometers forming the respective rows are arranged at the same height with each other and the plurality of thermometers forming the respective rows are arranged at different heights, It is possible to measure the shape of the molten steel bath surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten steel visualization apparatus,

The present invention relates to a bath surface visualization apparatus and a bath surface visualization method using the bath surface visualization apparatus, and more particularly, to a bath surface visualization apparatus capable of measuring the bath surface shape of a molten steel in a mold and a bath surface visualization method using the same.

In general, the continuous casting process continuously injects molten steel into a mold having a predetermined shape, and continuously injects molten steel in a mold into the lower side of the mold to form a slab, a bloom, a billet ) And the like. The molten steel injected by the circulation of the cooling water in the mold is reacted and formed into a certain shape. That is, the molten steel in the molten state is reacted by the primary cooling action in the mold, and the non-solidified molten steel drawn from the mold is solidified by the cooling water injected from the secondary cooling stand extending to the lower side of the mold, State of the state is formed.

The primary cooling in the mold is most important in determining the surface quality of the slab. That is, the primary cooling depends on the flow of the molten steel in the mold, and a mold flux is applied on the molten steel meniscus for lubrication between the molten steel and the mold inner wall and for keeping the molten steel warm. However, if a rapid flow or a bias flow occurs in the meniscus in the mold, the incorporation of the mold flux is caused, thereby causing defects in the cast steel.

In order to prevent the casting defects due to the flow of the bath surface, it is necessary to measure the shape of the bath surface of the molten steel accurately in real time during the casting operation. However, since the molten steel is kept in a high temperature state in the mold, it is difficult to measure the flow pattern (or the flow pattern, the flow shape) in real time by the improvement of the bath surface. Further, since the mold flux is applied on the molten steel bath surface, observation with the naked eye, camera, or the like is impossible so that the operator can confirm it.

Accordingly, a method of indirectly measuring the temperature of the molten steel outside the mold and visualizing the shape of the molten steel in the mold has been studied, and various methods for measuring the accurate shape of the molten steel have been demanded.

KR 2014-0014459A JP 1999-90599A

The present invention provides an apparatus for visualizing a bath surface of a molten steel in a mold and a method for visualizing a bath surface using the same.

The present invention provides a bath surface visualization device capable of reducing the occurrence of a casting defects and a bath surface visualization method using the same.

The trough visualization apparatus according to the present invention includes a plurality of thermometers for measuring the temperature of molten steel inserted into a mold in which molten steel is received and accommodated in the mold, The plurality of thermometers forming the rows and the plurality of thermometers are arranged at the same height, and the plurality of thermometers forming the respective rows can be arranged at different heights.

The mold includes a pair of long sides spaced apart from each other and a pair of short sides opposing each other on both sides of the long side, and the plurality of temperature-measuring units may be provided on the long side.

The plurality of thermometers may be inserted in the longitudinal direction of the long side at an upper portion of the long side.

The plurality of temperature detectors may be disposed in a direction crossing the bath surface of the molten steel at an upper portion of the long side.

The heat most adjacent to the molten steel among the plurality of heat may be formed within 35 mm from the inner surface of the long side in contact with the molten steel.

The thermometer disposed in each row among the plurality of rows may be arranged in a straight line in the thickness direction of the long side.

The plurality of thermometers may be inserted in the thickness direction of the long side from one side of the long side.

The plurality of temperature detectors may be disposed on one side of the long side in a direction parallel to the molten steel bath surface.

A thermometer inserted most adjacent to the molten steel among the plurality of thermometers may be inserted within 35 mm from the inner surface of the long side in contact with the molten steel.

The thermometer forming each row of the plurality of rows may be disposed on a straight line in the longitudinal direction of the long side.

The plurality of thermometers may be installed at a height of 50 mm or less from the bath surface of the molten steel to the upper portion and the lower portion.

The inter-row spacing may be within 15 mm.

The method for visualizing the trough surface according to the present invention includes the steps of measuring the temperature of molten steel in the width direction of the mold using a plurality of thermometers arranged to form a plurality of rows and a plurality of rows along the width direction of the mold; Calculating a temperature value measured in a plurality of thermometers arranged so as to have different heights in the plurality of rows among the temperature values measured through the plurality of thermometers and forming each row to calculate an average temperature value in each row Process; And visualizing the molten steel bath surface in the width direction of the mold using the average temperature value calculated for each row.

The plurality of thermometers may be inserted in the longitudinal direction of the long side of the long side of the mold to form the plurality of rows and the plurality of rows.

The plurality of rows may be formed in the thickness direction of the long side and a plurality of temperature values may be measured in the thickness direction and the width direction of the long side.

A plurality of temperature values measured in the thickness direction of the long side are used to measure a heat flow rate discharged to the mold and a heat flow distribution is measured in a width direction of the mold using the measured temperature flow rate to determine an initial solidification degree of the molten steel .

The plurality of thermometers may be inserted in the thickness direction of the long side from one long side of the mold to form the plurality of rows and the plurality of rows.

The plurality of rows may be formed in the longitudinal direction of the long side and a plurality of temperature values may be measured in the longitudinal direction and the width direction of the long side.

According to the embodiments of the present invention, a plurality of thermometers are disposed at different depths on an upper portion or a front surface of a copper plate forming a mold to detect the temperature of the molten steel by the width direction position of the mold, The molten steel bath surface can be converted into a relative height according to the position to make the bath surface shape visible. Further, by controlling the flow of molten steel by using the result of visualizing the detected molten steel surface shape, it is possible to control the flow of molten steel in operation to be a steady flow pattern with little or no possibility of the occurrence of scrap defects. Therefore, the shape of the molten steel bath surface can be visualized in real time, and the flow of molten steel can be controlled in real time by using the same to prevent the occurrence of defects due to the flow of molten steel, thereby improving the quality of the steel strip.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a mold provided with a bathtub visualizing device according to an embodiment of the present invention; Fig.
FIG. 2 is a view for explaining an arrangement of the side heaters shown in FIG. 1. FIG.
3 is a perspective view illustrating a mold having a bathtub visualizing device according to a modification of the present invention.
Fig. 4 is a view for explaining an arrangement of the side heaters shown in Fig. 3; Fig.
5 is a view showing an example in which a molten steel bath surface is visualized in three dimensions (3D);

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. It is provided to fully inform the category. Wherein like reference numerals refer to like elements throughout.

FIG. 1 is a perspective view showing a mold provided with a bathtub visualization device according to an embodiment of the present invention, and FIG. 2 is a view for explaining an arrangement of the space heaters shown in FIG.

1 and 2, a casting facility including a trough-side visualizing device according to an embodiment of the present invention includes a mold 10 for supplying molten steel from a nozzle 20, for example, an immersion nozzle 20, And a plurality of thermometers 100 spaced apart from each other in the width direction of the mold 10 in the mold 10 and measuring the temperature in each of them. A flow control unit (not shown) is provided outside the mold 10 to control the flow of the tamping water. A control unit (not shown) controls the operation of the flow control unit using the result measured by the thermometer 100 . At this time, the flow control unit may include a core member extending in one direction of the mold 10, and a coil member wound around the outer circumferential surface of the core member and spaced apart from each other along the extending direction of the core member. Here, the flow regulating portion is a general EMS, and controlling the moving direction, rotation, acceleration force and deceleration force of the magnetic field is not particularly limited, and is the same as that of a typical EMS driving method.

Although not shown, the casting equipment includes a tundish which is located above the casting mold 10 and temporarily stores the molten steel, a cooling device that is installed below the casting mold 10 to inject cooling water into the reaction casting material poured from the casting mold 10, And a secondary cooling zone for letting the cooling water pass through. Here, the secondary cooling zone may have a configuration in which a plurality of segments extend in the casting direction.

The tundish, the nozzle 20, the secondary cooling stand, and the like are the same as those of the general casting equipment, and therefore, a description thereof will be omitted.

The mold 10 receives molten steel supplied from the nozzle 20, and primarily cools the molten steel in a predetermined cast shape. The mold 10 has two long sides 11a and 11b which are spaced apart from each other by a predetermined distance as shown in FIGS. 1 and 2 and a pair of long sides 11a and 11b which are spaced by a predetermined distance between the two long sides 11a and 11b, And two short sides 12a and 12b provided for viewing. Here, the long sides 11a and 11b and the short sides 12a and 12b may be made of copper, for example. Thus, the mold 10 is provided with a predetermined space for accommodating molten steel between the two long sides 11a and 11b and the two short sides 12a and 12b.

In the following description, the width direction of the long sides 11a and 11b means the horizontal direction or the width direction of the cast steel, and the longitudinal direction of the long sides 11a and 11b means the vertical direction or the pulling direction of the cast steel. The thickness direction of the long sides 11a and 11b means the direction toward the inner surface contacting the molten steel on the outer surface exposed to the outside, that is, the inner direction from the outside.

A nozzle 20 is provided at a central portion formed by the two long sides 11a and 11b of the mold 10 and the two short sides 12a and 12b. The molten steel supplied from the nozzle 20 is supplied symmetrically outwardly from the central portion of the mold 10, and a discharge flow is formed while showing a specific flow phenomenon depending on operating conditions and the like. On the other hand, the molten steel is accommodated in the mold 10 so that the upper end of the mold 10 remains at a predetermined width, and mold flux can be applied to the molten steel upper surface. The upper surface of the molten steel, that is, the surface of the molten steel, becomes a meniscus.

The plurality of thermometers 100 measures the temperature of the molten steel or molten steel bath surface accommodated in the mold 10 during operation. In the embodiment, the thermometer is used as the thermometer 100, but various means capable of measuring the temperature can be applied.

The plurality of thermometers 100 may be installed on the long sides 11a and 11b of the mold 10. [ Each of the thermometers 100 is inserted through the upper surfaces of the long sides 11a and 11b to be disposed in the longitudinal direction of the long sides 11a and 11b, for example, in parallel with the casting direction of the cast steel, .

The plurality of temperature meters 100 may be arranged to form a plurality of rows A, B and C and a plurality of rows D1 to Dn on the long sides 11a and 11b. Here, a plurality of rows A, B and C are formed in the width direction of the long sides 11a and 11b, and a plurality of rows D1 to Dn are formed in the thickness direction of the long side. That is, a part of the plurality of thermometers 100 is arranged in a row in the width direction of the long sides 11a and 11b to form the first column A and the second column B , And the third row (C) can be formed on one side of the second row (B). Although it is described here that a plurality of temperature meters 100 are arranged in three rows, it is needless to say that they may be formed in two rows or three or more rows. A plurality of thermometers 100 disposed at the same position in the longitudinal direction of the long sides 11a and 11b among the thermometers 100 forming the respective columns A, And are arranged in a straight line in the thickness direction to form the rows D1 to Dn.

The row of the thermometer 100a formed in the direction adjacent to the molten steel in the long sides 11a and 11b is referred to as a first row A and the row of the thermometers 100b formed on the outer side is referred to as a second row B), and the row of the thermistor 100c formed on the outermost side is referred to as a third row (C).

The thermometer 100a forming the first row A may be formed at the same height from the upper surface of the long sides 11a and 11b. For example, at the same height (H 1 ) within a range from the upper 50 mm to the lower 50 mm from the molten steel bath surface (H 0 ). Since the temperature measuring result is accurately outputted as the temperature measuring instrument 100 is disposed closer to the molten steel bath surface, it is preferable that the temperature measuring instrument 100 is disposed within a range of 5 mm to 5 mm below the molten steel bath surface. The thermometer 100a forming the first row A may be installed within 35 mm (P 0 ) from the inner surface of the long side 11a, 11b in contact with the molten steel. More preferably within 12 mm from the inner surface of the long side 11a, 11b in contact with the molten steel. In other words, the thermometer 100a forming the first row A is preferably formed adjacent to the molten steel for more accurate temperature measurement. The thermostats 100a forming the first row A may be arranged at equal intervals from each other, and may be arranged to have an interval of about 10 to 100 mm, for example.

The second row B is spaced a predetermined distance P 1 from one side of the first row A and may be spaced about 5 to 15 mm, for example. The thermometer 100b forming the second row B may be formed at the same height from the upper surface of the long sides 11a and 11b. For example, at the same height within a range from the upper 50 mm to the lower 50 mm from the molten steel bath surface. At this time, the thermometer 100b forming the second row B may be formed to have a height different from that of the thermometer 100a forming the first row A within a prescribed range. The thermometer 100b forming the second row B may be formed at a higher position than the thermometer 100a forming the first row A as shown in FIG. Can be located at different heights from the thermometer (100a) forming the first row (A). For example, when the thermometer 100a forming the first row A is disposed 5 mm above the molten steel bath surface, the thermometer 100b forming the second row B is placed 10 mm above the bath surface .

The third row C is formed to be spaced apart from one side of the second row B and may be formed to be spaced about 5 to 15 mm, for example. The thermometer 100c forming the third row C may be formed at the same height from the upper surface of the long sides 11a and 11b. For example, at the same height within a range from the upper 50 mm to the lower 50 mm from the molten steel bath surface. At this time, the thermometer 100c forming the third column (C) has a height different from that of the thermometers (100a, 100b) forming the first row (A) and the second row (B) . The thermometer 100c forming the third row C is formed at a higher position than the thermometers 100a and 100b forming the first row A and the second row B as shown in Fig. And may be located at different heights from the side tanks 100a, 100b forming the first row A and the second row B within the presented range. The thermometer 100a forming the first row A is disposed 5 mm above the hot water surface of the molten steel and the thermometer 100b forming the second heat B is placed 10 mm above the hot water surface , The thermometer 100c forming the third row (C) may be disposed at an upper portion of 15 mm from the bath surface.

The plurality of thermometers 100 forming the first to third columns A to C are formed within a range H 2 from the upper portion 50 mm to the lower portion 50 mm from the bath surface H 0 of the molten steel It is good. The thermometer 100c forming the third row C is preferably formed within a predetermined distance P 2 , for example, 60 to 70 mm from the inner surfaces of the long sides 11a and 11b in contact with the molten steel. This is because the accuracy of the measurement result becomes lower as the distance measuring machine 100 moves away from the molten steel.

The numerical limitation of the distance between the first row (A), the second row (B) and the third row (C) and the height of the temperature controllers (100a, 100b, 100c) This is to accurately visualize the molten steel bath surface by accurately measuring the temperature.

FIG. 3 is a perspective view showing a mold having a bathtub visualization device according to a modified embodiment of the present invention, and FIG. 4 is a view for explaining an arrangement of the side heaters shown in FIG.

A plurality of thermometers 100 are inserted into the outer surface (or the front surface) of the long sides 11a and 11b which are not in direct contact with one surface of the mold 10, for example, molten steel so that the long sides 11a and 11b, For example, in a direction intersecting the casting direction of the cast steel, or in a direction parallel to the casting surface of molten steel.

The plurality of thermometer units 100 may be arranged to form a plurality of rows X and Y and a plurality of rows Z1 to Zn on one side of the long sides 11a and 11b. Here, a plurality of rows X and Y are formed in the width direction of the long sides 11a and 11b, and a plurality of rows Z1 to Zn are formed in the long direction of the long sides 11a and 11b. The temperature controllers 100x and 100y may be arranged in a straight line in each of the rows Z1 to Zn formed in the longitudinal direction of the long sides 11a and 11b. Thus, a plurality of temperature values at specific positions in the width direction of the long sides 11a, 11b can be measured.

Hereinafter, the heat of the thermometer 100x formed at a height adjacent to the molten steel bath surface at the long sides 11a and 11b will be referred to as a first row X, and the heat of the thermometer 100y formed thereon will be referred to as a second It is called column (Y). Herein, it is described that the heaters are formed in two rows, but it is needless to say that they can be formed in more rows.

The thermostats 100x forming the first row X may be formed at the same height on the outer surface of the long sides 11a and 11b, for example, on the front surface. May be formed at the same height within a range from the upper 50 mm to the lower 50 mm from the molten steel bath surface (H 0 ). Since the temperature measuring instrument 100x is disposed closer to the bath surface of the molten steel and the temperature measurement result is accurately displayed, it is preferable that the temperature measuring instrument 100x is disposed within a range of 5mm to 5mm below the molten steel bath surface. Further, the thermometer forming the first row X may be installed within 35 mm (P 0 ) from the inner surface of the long sides 11a, 11b in contact with the molten steel. More preferably within 12 mm from the inner surface of the long side 11a, 11b in contact with the molten steel. In other words, the thermometer 100x forming the first row X is preferably formed adjacent to the molten steel for more accurate temperature measurement. The thermostats 100x forming the first row X may be disposed at equal intervals from each other, and may be arranged to have an interval of, for example, about 10 to 100 mm.

The second row Y is formed to be spaced apart from the first row X by a predetermined distance H 1 and may be formed to be spaced from the first row X by about 5 to 15 mm, for example. The thermometer 100y forming the second row Y may be formed at the same height from the front surfaces of the long sides 11a and 11b. For example, at the same height within a range from the upper 50 mm to the lower 50 mm from the molten steel bath surface. At this time, the thermometer 100y forming the second row Y may be formed to have a depth different from that of the thermometer 100x forming the first row X within the prescribed range. In other words, the thermometer 100y forming the second row Y is provided with a side temperature sensor 100y which forms a first row X, which is a distance P 2 from the inner surface of the long sides 11a and 11b contacting the molten steel, The spacing P 1 between the thermometer 100y forming the second row Y and the thermometer 100x forming the first row X may be different from the spacing P 1 between the thermometer 100x and the thermometer 100x, 15 mm. For example, when the thermometer 100x forming the first row X is disposed so as to be spaced apart by 10 mm from the inner surface of the long sides 11a and 11b, the thermometer 100y forming the second row Y has a long side And spaced apart by 15 mm from the inner surface of the inner surface 11a, 11b.

The plurality of thermometers 100 forming the first row X and the second row Y are formed within a range H 1 from the upper portion 50 mm to the lower portion 50 mm from the molten steel bath surface H 0 It is good. The thermometer 100c forming the second row Y is preferably formed within a predetermined distance P 2 , for example, 60 to 70 mm from the inner surfaces of the long sides 11a and 11b in contact with the molten steel. This is because the accuracy of the measurement result becomes lower as the distance measuring machine 100 moves away from the molten steel.

The numerical limitation of the interval between the first row X and the second row Y and the depth of the side warmer in each row makes it possible to precisely measure the temperature of the molten steel to more accurately visualize the molten steel bath surface It is for this reason.

With this configuration, when a plurality of thermometers are installed in the mold, the temperature of the molten steel can be measured at each position using the measured temperature, and the molten steel bath surface can be visualized using the measurement result.

5 is a view showing an example in which the molten steel bath surface is visualized in three dimensions (3D).

First, the temperature of the molten steel is measured using a plurality of thermometers arranged so as to form a plurality of rows and a plurality of rows along the width direction of the mold, and arranged so as to have different heights in a plurality of rows. At this time, since the plurality of thermometers form heat in the width direction of the mold, it is possible to measure the molten steel temperature in the width direction of the mold and to form a row in the longitudinal direction of the mold, Can be measured.

When the temperature of the molten steel is measured through the plurality of the thermometers, the control unit can make the data so as to visualize the molten steel bath surface using the temperatures measured in the respective thermometers. At this time, it is possible to calculate the average temperature value in each row by calculating the temperature measured in each row, that is, the temperature value measured in a plurality of thermometers disposed in each row. Once the average temperature value in each row is calculated, one temperature value, i.e., an average temperature value, may be provided for each row along the width direction of the mold.

Thus, by measuring one or more temperature values at the same bath surface height and the same main bath width point through a plurality of rows and a plurality of rows of thermometers, the bath surface shape can be more accurately visualized by converting the temperature value into an average temperature value.

In addition, the heat flux can be measured using the temperature value at different depths in the thickness direction of the long sides 11a and 11b, and the initial non-uniform solidification degree can be confirmed through the heat flow distribution in the width direction.

In addition, a plurality of bath surface shape results can be obtained using the relative temperature between the side heaters provided at the same depth, with the depth of the side surface warmers being uneven in the thickness direction of the long side surfaces 11a and 11b. When the molten steel flow in the mold is very irregular, the temperature of the thermometer, which is farther from the inner surface of the long sides (11a, 11b) contacting the molten steel and the temperature of the thermometer, When the molten steel flow is stable, the inner surface of the long sides (11a, 11b) contacting molten steel and the distance between the side heaters are close to each other so that the temperature sensitivity of the side warmer is high due to the variation of the molten steel bath surface The shape of the bath surface can be precisely visualized by using the temperature of the thermometer.

Then, the molten steel bath surface can be visualized by using the average temperature value calculated for each row. The process of visualizing the molten steel bath surface can be visualized in three dimensions (3D) as shown in FIG. 5 by converting the average temperature value of each row relative to the relative height according to the position of the molten steel bath surface, It can be displayed on a display unit (not shown) so that it can be confirmed.

By visualizing the molten steel bath surface, it is possible to grasp the molten steel flow pattern and control the flow of the molten steel through a flow regulating portion in a pattern that can prevent the steel strip defects.

As described above, according to the present invention, since the molten steel bath surface can be visualized in real time, the flow pattern of the molten steel can be grasped through the molten steel bath surface shape and the flow of the molten steel can be controlled in real time, , The quality of the cast steel can be improved.

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 and variations can be made in the present invention without departing from the spirit or scope of the following claims.

10: mold 20: nozzle
100: side heaters

Claims (18)

A pair of long sides facing each other so as to receive molten steel therein and a pair of short sides provided opposite to each other on both sides of the long side so as to measure a temperature of molten steel accommodated in the mold, And a side-
Wherein the plurality of thermometers are inserted into the long side in a direction intersecting the molten steel bath surface and are spaced from each other to form a plurality of rows and a plurality of rows,
The plurality of thermometers forming each row are disposed so as to have the same distance from each other from the inner surface of the long side in contact with the molten steel and the plurality of thermometers forming each row have different distances from the inner surface of the long side Wherein the trough surface visualization device is disposed. The method according to claim 1,
And a row closest to the inner surface of the long side among the plurality of rows is formed within 35 mm from the inner surface of the long side. The method of claim 2,
Wherein the thermometer disposed in each row among the plurality of rows is disposed on a straight line in the thickness direction of the long side. The method of claim 3,
And the plurality of thermometers are inserted in the thickness direction of the long side from the outer side of the long side. The method of claim 4,
Wherein a thermometer inserted most adjacent to the molten steel among the plurality of thermometers is inserted within 35 mm from an inner surface of the long side in contact with the molten steel. The method of claim 5,
Wherein the plurality of thermometers are installed so as to have a distance of 50 mm or less from the bath surface of the molten steel to the upper and lower sides. The method of claim 6,
Wherein the interval between the rows is within 15 mm. A pair of long sides facing each other so as to receive molten steel therein and a pair of short sides provided opposite to each other on both sides of the long side so as to measure a temperature of molten steel accommodated in the mold, And a side-
The plurality of thermometers are vertically inserted into an upper surface of the long side and are spaced from each other to form a plurality of rows and a plurality of rows,
Wherein the plurality of thermometers forming the respective rows are disposed at the same distance from the bath surface of the molten steel and the plurality of thermometers forming the respective rows are arranged to have different distances from the bath surface of the molten steel. The method of claim 8,
And the plurality of thermometers are arranged in a direction intersecting with the molten steel bath surface. delete delete delete delete delete delete delete delete delete
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