KR20130013738A - Method and apparatus for measuring mold fluctuation of continuos casting machine - Google Patents

Abstract

PURPOSE: A break surface change measuring device of a continuous caster mold is provided to minimize the defects of the short side of a thin slab continuous caster mold based on the changes of a break surface, and to improve the quality of a slab. CONSTITUTION: A break surface change measurement device of a continuous caster machine mold comprises a set of first temperature sensors(111-115), a set of second temperature sensors(211-215), and a control unit(310). The first temperature sensors are multiply arranged with a space on the short side of the continuous caster machine mold. The second temperature sensors are multiply arranged with a space on the other short side to establish a one-to-one match with the first temperature sensors. The control unit is connected electrically with the first temperature sensors and the second temperature sensors, and measures the change of the break surface of the continuous caster mold based on a first and a second temperature data. One of the sensors is used as a reference to set the positions of the rest of the sensors to be implemented. [Reference numerals] (310) Control unit; (313) Monitor

Description

Apparatus and method for measuring fluctuations in the surface of the mold of the machine mold {METHOD AND APPARATUS FOR MEASURING MOLD FLUCTUATION OF CONTINUOS CASTING MACHINE}

The present invention relates to an apparatus and method for measuring the surface variation of a player mold, and more particularly, to an apparatus and method for measuring the surface variation of a player mold for measuring and stabilizing the fluctuation of the surface of a thin slab player mold.

In general, a continuous casting machine (hereinafter, abbreviated as "yeon cycle") receives molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish, and then supplies a cast steel mold to a cast machine mold. It is facility to do.

The player includes a ladle for storing molten steel, a tungsten mold for casting the tumbled steel and the molten steel exiting from the tundish to form a strand having a predetermined shape, and a plurality of molds connected to the mold to move the strand formed in the mold. And pinch rolls.

In other words, the molten steel tapping out of the ladle and the tundish is formed of a strand having a predetermined width, thickness, and shape in a mold and is transferred through a pinch roll, and the strand transferred through the pinch roll is cut by a cutter to have a predetermined shape. It is made of slab having a.

Liquid molten steel begins to solidify in the mold during the continuous casting process, so the quality of the surface of the slab and the quality of the surface directly below the surface have a significant influence on the initial solidification process in the mold. In particular, the cross-section of the slab is prone to fluctuations in the surface of the slab due to factors such as clogging or dropping of the molten steel discharge port, asymmetric flow due to clogging, and defects due to uneven solidification. In particular, in the case of a thin slab player, the width of the short side portion is narrower than that of the mold center, and thus the possibility of defects due to fluctuations in the water surface is higher than that of the general player.

Related prior art is Korean Patent Publication No. 2006-0077308.

Korean Laid-Open Patent Publication No. 10-2006-0077308

An object of the present invention is to provide an apparatus and method for measuring the fluctuation of the floor of the player mold which can effectively stabilize the level of fluctuation of the floor of the player mold.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular embodiments that are described. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, There will be.

An apparatus for measuring fluctuation of the floor surface of a player mold according to the present invention for achieving the above object comprises: first temperature sensors arranged in plural numbers at one end of the player mold at intervals; A plurality of second temperature sensors arranged on the other end side of the player mold with a distance therebetween and corresponding one to one with the first temperature sensors; And the first and second temperature sensors electrically connected to the first temperature sensors and the second temperature sensors, based on the first temperature data and the second temperature data transmitted from the first temperature sensors and the second temperature sensors, respectively. And control means for measuring fluctuations in the running water.

Specifically, the first and second temperature sensors may be arranged above and below other sensors based on one sensor located on the floor.

The control means obtains a difference (-) between the first temperature data and the second temperature data corresponding to one-to-one, and compares each obtained value with a corresponding reference value, and when the calculated value exceeds the reference value, By determining whether the obtained value is a positive (+) or a negative (-) value, it is possible to measure fluctuations in the mold of the player mold.

The control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data, and if the calculated value exceeding the reference value is positive, the tap surface of one side of the mold is higher than the tap surface of the other side. On the contrary, if it is negative (-), it can be measured that the tap surface of the other short side is higher than the tap surface of one cross section.

The control means may externally display the first temperature data, the second temperature data, the obtained value and the measurement result.

In the method of measuring the fluctuation of the surface of the player mold of the present invention, the control means obtains the first temperature data and the second temperature data from the first temperature sensors and the second temperature sensors arranged on one side and the other side of the player mold, respectively. First step; A second step of said control means obtaining a difference (-) between said first temperature data and said second temperature data corresponding to one-to-one respectively; A third step of the control means comparing each of the obtained values with a corresponding reference value; And a fourth step of, if the control means exceeds the reference value, determining whether the obtained value is a positive (+) value or a negative (-) value to measure fluctuations in the mold of the player mold. Include.

Specifically, in the second step, the control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data, and in the fourth step, the control means has a positive value (+) exceeding the reference value. ), It is possible to measure that the tap surface of one end of the mold is higher than the tap surface of the other side.

In the method for controlling the water level fluctuation of the player mold of the present invention, the control means obtains the first temperature data and the second temperature data from the first temperature sensors and the second temperature sensors arranged on one side and the other side of the player mold, respectively. First step; A second step of said control means obtaining a difference (-) between said first temperature data and said second temperature data corresponding to one-to-one respectively; A third step of the control means comparing each of the obtained values with a corresponding reference value; And if the control means exceeds the reference value, determines whether the obtained value is a positive (+) or negative (-) value, and measures fluctuations in the mold of the player mold. And a fourth step of controlling the operation of the electromagnetic flow control device disposed on the left and right sides of the mold.

Specifically, in the second step, the control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data, and in the fourth step, the control means has a positive value (+) exceeding the reference value. ), The surface of one end of the mold is higher than the surface of the other side, and the current of the electromagnetic flow control device adjacent to the one side is increased.If the negative side is negative, the surface of the other side is the surface of one side of the mold. By measuring higher, the current of the electromagnetic flow control device adjacent to the other side can be increased.

As described above, the present invention can effectively stabilize the tang surface by measuring the fluctuation of the tang surface of the player mold in real time and applying the measurement result to the electromagnetic flow control device. As a result, defects in the short sides of the player mold, that is, the thin slab player mold due to fluctuations in the water surface can be minimized, and the slab quality can be improved.

1 is a conceptual diagram illustrating a continuous casting machine centered on the flow of molten steel (M) according to an embodiment of the present invention.
2 is a view showing a state in which the apparatus for measuring the fluctuation of the water level of the player mold according to the embodiment of the present invention is installed in the player mold.
FIG. 3 is a view showing a state of FIG. 2 viewed from top to bottom. FIG.
4 is a flowchart illustrating a method for controlling fluctuation of the floor of the player mold of the present invention.
5 and 6 are views showing the appearance of fluctuation of the floor of the player mold.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like elements in the figures are denoted by the same reference numerals wherever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a conceptual diagram for explaining a continuous casting machine mainly on the flow of molten steel (M).

Referring to the drawings, the molten steel (M) flows to the tundish 20 in a state accommodated in the ladle (10). For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends so as to be submerged in the molten steel in the tundish 20 so that the molten steel M is not exposed to the air and oxidized and nitrided. The case where molten steel M is exposed to air due to breakage of shroud nozzle 15 is referred to as open casting.

The molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 corresponding to the immersion nozzle 25.

Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25. Control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method, which is different from the stopper method. The slide gate controls the discharge flow rate of the molten steel M through the immersion nozzle 25 while the sheet material slides in the horizontal direction in the tundish 20.

The molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface forming the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M. By the way that the periphery is first solidified, the rear portion along the casting direction of the cast slab 80 forms a shape in which the unsolidified molten steel 82 is wrapped in the solidified shell 81.

As the pinch roll pulls the front end portion 83 of the performance cast slab 80 completely solidified, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The uncondensed molten steel 82 is cooled by the spray means 65 for spraying the cooling water in the above movement process. This causes the thickness of the non-solidified molten steel 82 to occupy in the playing cast 80 gradually decreases. When the playing cast piece 80 reaches a point 85, the playing cast piece 80 is filled with the solidification shell 81 in its entire thickness. The performance casting cast 80 after solidification is cut into a predetermined size at the cutting point 91 and divided into slabs P, that is, cast slabs.

On the other hand, in Fig. 1, the device including the support roll 60 and the pinch roll is called a strand (strand), the cast slab 80 described in the present invention is the solidification is moved between the mold 30 and the cutter 90 The shell 81 and the unsolidified molten steel 82 are called.

2 is a view showing a state of fluctuation measuring device of the player mold according to an embodiment of the present invention is installed in the player mold, the surface fluctuation measuring device of the player mold of the present invention is the first temperature sensor (111 ~ 115), And second temperature sensors 211 to 215 and control means 310.

A plurality of first temperature sensors 111 to 115 are arranged on the inner surface of one end 31 of the player mold 30 at intervals from each other, and the second temperature sensors 211 to 215 are arranged on the mold 30. The other short sides 33 are arranged in plural at intervals with each other, and are arranged to correspond one-to-one with the first temperature sensors 111 to 115. In the drawings, the numbers of the sensors 111 to 115 and 211 to 215 are exemplified, and the number may be increased or decreased as necessary.

The first temperature sensors 111-115 and the second temperature sensors 211-215 are based on one sensor 111, 211 located on the water surface, and the other sensors 112-115, 212-215. ) Are arranged above and below the floor. That is, based on the first temperature sensor 111, the first temperature sensors 112 and 113 are disposed on the water surface, and the first temperature sensors 114 and 115 are disposed below the water surface, and based on the second temperature sensor 211. As a result, the second temperature sensors 212 and 213 are disposed on the floor, and the second temperature sensors 214 and 215 are disposed below the floor. As the first temperature sensors 111 to 115 and the second temperature sensors 211 to 215, a normal thermocouple may be used.

The control means 310 is located remotely from the mold 30 and electrically connected to the first temperature sensors 111 to 115 and the second temperature sensors 211 to 215. The control means 310 is the first temperature data (L _{1 ~ 5} ) and the second temperature data (R _{1 ~} ) transmitted from the first temperature sensors (111 ~ 115) and the second temperature sensors (211 ~ 215), respectively _{. 5} ) the fluctuation of the wet and dry side of the mold 30 is measured based on the above. Such control means 310 will be a conventional computer device.

In this structure, the first temperature sensors 111 to 115 and the second temperature sensors 211 to 215 may be installed at intervals of 10 mm, and the control means 310 may be attached to the monitor 313 installed in the player's cab. The first temperature data (L _{1 ~ 5} ), the second temperature data (R _{1 ~ 5} ) and the values obtained through this (D _{T1 ~ 5)} and the measurement results, it is possible to display the control state.

As shown in FIG. 3, electromagnetic induction control devices 411 and 413 are installed at left and right sides of the mold 30 around the immersion nozzle 25. Electromagnetic induction control devices 411 and 413 apply current to the floor to pursue safety of the floor.

As shown in FIG. 4, in the method of controlling the water level fluctuation of the mold of the player mold through the measuring device, the control unit 310 may be configured from the first temperature sensors 111 to 115 and the second temperature sensors 211 to 215. The process starts with obtaining the first temperature data L ₁ , L ₂ , L ₃ , L ₄ , L ₅ and the second temperature data R ₁ , R ₂ , R ₃ , R ₄ , R ₅ (step S1). ).

When the temperature data L _{1 to 5} and R _{1 to 5} are obtained, the control means 310 determines the difference (-) between the first temperature data L _{1 to 5} and the second temperature data R _{1 to 5} . Are obtained, and the difference between the one-to-one corresponding first temperature data L _1-5 and second temperature data R _1-5 is obtained (step S2). For example, the control means 310 is a difference between the first temperature data corresponding to the one-to-one second temperature data (L _1- R ₁ = D _T1 , L _2- R ₂ = D _T2 , L _3- R ₃ = D _T3 , L ₄ -R ₄ = D _T4 , L ₅ -R ₅ = D _T5 ), respectively.

When the difference value D _{T1 to 5} is obtained as described above, the control unit 310 selects each of the calculated values D _T1 , D _T2 , D _T3 , D _T4 and D _T5 from the corresponding reference value A _1. , A ₂ , A ₃ , A ₄ , A ₅ ) (step S3). That is, the comparison that the calculated value exceeds the reference value _{(D T1> A 1, D} T2> A 2, D T3> A 3, D T4> A 4, D T5> A 5). At this time, the value (D _T1-5 ) of the difference _between the first temperature data (L _1-5 ) and the second temperature data (R _1-5 ) in the normal working state is measured for a predetermined time, and thus the normal operating conditions Can be set as the reference value ((A _{1 to 5} , time average of absolute values of the difference between the first and second temperature data).

When the calculated values D _{T1 to 5} exceed the reference values A _{1 to 5} , the control unit 310 determines that the obtained values D _{T1 to 5} are positive or negative values. By determining whether the mold 30 fluctuates fluctuation (step S4), according to the measurement results by controlling the operation of the electromagnetic flow control devices 411, 413 respectively disposed on the left and right sides of the mold 30 to stabilize the floor ( Step S5 or step S6).

For example, as shown in FIG. 5, when the obtained value D _{T1 to 5} exceeding the reference value A _{1 to 5} is positive (+), the control means 310 controls one short side 31 of the mold 30. Since the tap surface is higher than the tap surface of the other short side 33, it is measured and the current level of the one side 31 and the neighboring electromagnetic flow control device 411 is raised to stabilize the tap surface (step S5).

On the contrary, as shown in FIG. 6, if the obtained value D _{T1 to 5} exceeding the reference value A _{1 to 5} is negative (-), the control means 310 controls the other short side 33 of the mold 30. Since the surface of the water is higher than the surface of the water in one end surface 31, the surface of the other side 33 and the neighboring electromagnetic flow control device 413 are raised to stabilize the water surface (step S6).

In this way, if the current of the electromagnetic flow control device 411 or 413 is raised to the higher side, the flow rate is lowered by the force F formed according to the Fleming's left-hand law, so that stabilization of the surface can be effectively achieved.

The control means 310 performs this process in real time repeatedly and effectively stabilizes the hot water surface of the mold 30.

As described above, according to the present invention, by comparing the difference between the D _T value and the reference value (A) in real time, it is possible to confirm the presence and degree of fluctuation of the water level due to actual nozzle clogging / dropping or drift. By applying the measurement results to the electromagnetic flow control device, the floor can be effectively stabilized. As a result, defects in the short sides of the player mold, that is, the thin slab player mold due to fluctuations in the water surface can be minimized, and the slab quality can be improved.

The present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

10: ladle 15: shroud nozzle
20: tundish 21: stopper
25: immersion nozzle 30: mold
31, 33: Short 60: Support Roll
65: spread means 80: playing cast
81: solidified shell 82: unsolidified molten steel
83: tip 85: solidification completion point
90: cutting machine 91: cutting point
111 to 115: First temperature sensor 211 to 215: Second temperature sensor
310: control means 313: monitor
411,413: electromagnetic induction controller

Claims (9)

A plurality of first temperature sensors arranged on one end of the player mold at intervals from each other;
A plurality of second temperature sensors arranged on the other end side of the player mold with a distance therebetween and corresponding one to one with the first temperature sensors; And
The apparatus of the player mold is electrically connected to the first temperature sensors and the second temperature sensors, based on the first temperature data and the second temperature data transmitted from the first temperature sensors and the second temperature sensors, respectively. Control means for measuring fluctuations in fluctuation;
Apparatus for measuring fluctuation of the floor of the mold.
The method according to claim 1,
The first and second temperature sensors are the surface level fluctuation measuring device of the player mold in which the other sensors are arranged above and below the floor surface based on one sensor located on the floor.
The method according to claim 1,
The control means obtains a difference (-) between the first temperature data and the second temperature data corresponding to one-to-one, and compares each obtained value with a corresponding reference value, and when the calculated value exceeds the reference value, The apparatus for measuring fluctuation of the floor of the player mold, which determines whether the obtained value is a positive (+) value or a negative (-) value and measures the fluctuation of the wet mold.
The method according to claim 3,
The control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data, and if the calculated value exceeding the reference value is positive, the tap surface of one side of the mold is higher than the tap surface of the other side. If the measurement, on the contrary negative (-), the floor surface fluctuation measuring device of the player mold for measuring that the tap surface of the other short side is higher than the tap surface of one cross section.
The method according to claim 3,
And said control means displays the first temperature data, said second temperature data, said obtained value, and a measurement result to the outside.
The control means, the first step of obtaining the first temperature data and the second temperature data from the first temperature sensors and the second temperature sensors arranged on one side and the other side of the player mold, respectively;
A second step of said control means obtaining a difference (-) between said first temperature data and said second temperature data corresponding to one-to-one respectively;
A third step of the control means comparing each of the obtained values with a corresponding reference value; And
And the fourth step of the control means, when the obtained value exceeds the reference value, determining whether the obtained value is a positive (+) value or a negative value (−) to measure fluctuation of the mold of the player mold. ,
Method of measuring the fluctuation of the surface of the machine mold.
The method of claim 6,
In the second step, the control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data,
In the fourth step, the control means measures that the tap surface of one side of the mold is higher than the tap surface of the other side if the value exceeding the reference value is positive (+), and on the contrary, the control surface of the other side is negative. The method of measuring the fluctuation of the surface of the player mold, which measures higher than the surface of the water in this one section.
The control means, the first step of obtaining the first temperature data and the second temperature data from the first temperature sensors and the second temperature sensors arranged on one side and the other side of the player mold, respectively;
A second step of said control means obtaining a difference (-) between said first temperature data and said second temperature data corresponding to one-to-one respectively;
A third step of the control means comparing each of the obtained values with a corresponding reference value; And
If the control means exceeds the reference value, the control means determines whether the obtained value is a positive (+) value or a negative (-) value, and measures fluctuations in the mold of the player mold. And a fourth step of controlling the operation of the electromagnetic flow control device disposed on the left and right sides of the mold,
Method of controlling fluctuation of the floor of the mold.
The method according to claim 8,
In the second step, the control means obtains a difference of one-to-one corresponding second temperature data from the first temperature data,
In the fourth step, if the calculated value exceeding the reference value is positive (+), the control means measures that the tap surface of one side of the mold is higher than the tap surface of the other side, and thus the electromagnetic flow control device adjacent to the one side. If the current is increased, and if the negative (-), the rising surface of the other end side is higher than the surface of the one surface of the one side, the rising surface of the player mold to increase the current of the electromagnetic flow control device adjacent to the other side.

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