KR20120011493A - Apparatus for measuring a flow of surface portion in molten steel, control system and method therefor - Google Patents

Abstract

PURPOSE: An inspection apparatus for the flow of the surface of melt, a control system, and a control method thereof are provided to automatically control a current value supplied to an electromagnetic stirrer through the profile of a molten slag layer. CONSTITUTION: An inspection apparatus for the flow of the surface of melt comprises a frame, a nail(115), and an aluminum member(117). One end of the nail is fixed to the frame, and the other end is extended and dipped in molten steel. An insertion groove is formed in the other end of the nail. The aluminum member is fixed to the insertion groove of the nail and is dipped in the molten steel with the nail.

Description

A water surface flow inspection device, a control system and a control method thereof {APPARATUS FOR MEASURING A FLOW OF SURFACE PORTION IN MOLTEN STEEL, CONTROL SYSTEM AND METHOD THEREFOR}

FIELD OF THE INVENTION The present invention relates to a surface flow inspection apparatus, system, and method for measuring the surface profile in a mold in a continuous casting process.

In general, a continuous casting machine is a device for producing slabs of a constant size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it to a mold for a continuous casting machine.

The continuous casting machine includes a ladle for storing molten steel, a continuous casting mold for cooling the tundish and the molten steel exiting from the tundish to form a casting having a predetermined shape, and a casting formed in the mold connected to the mold. It includes a plurality of pinch roller to move.

In other words, the molten steel tapping out of the ladle and the tundish is formed of a slab or a casting having a predetermined width and thickness in a mold and transferred through a pinch roller.

Summary of the Invention The present invention is directed to providing a surface flow inspection apparatus, system, and method for automating the surface flow inspection in a continuous casting process.

The present invention provides a surface flow inspection apparatus, a system and a method for acquiring a profile of the molten slag layer through image processing after photographing the surface flow inspection apparatus, and controlling the current value supplied to the EMS apparatus through the obtained profile. It is for.

The present invention provides a floor surface flow inspection apparatus, a system and a method for forming a grid pattern on an aluminum member in the surface flow inspection apparatus, and accurately calculating the thickness of the molten slag layer through the formed grid pattern to control the current value of the EMS apparatus. It is to.

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.

In accordance with one aspect of the present invention, there is provided a flow rate inspection apparatus for achieving the above object; A nail having one end mounted and fixed to the frame, the other end extending to be immersed in molten steel, and a nail having an insertion groove having a predetermined length formed at the other end; And an aluminum member fixedly installed in the insertion groove of the nail and immersed in molten steel together with the nail.

Specifically, the nails are mounted in a row at regular intervals on the frame, and the aluminum member is a single plate member that is simultaneously fitted in the insertion grooves of the nails arranged in a row.

A lattice pattern is printed or engraved on the aluminum member.

The surface flow inspection control system of the present invention for achieving the above object, the surface flow inspection apparatus for inspecting the flow direction of the molten steel and the profile of the molten slag layer is immersed in the molten steel in the mold; Moving means for immersing or extracting the molten metal flow inspection device by moving it horizontally and vertically into molten steel in a mold; A camera for photographing the molten steel inspection device taken out of the molten steel; An EMS device disposed around the outside of the mold and configured to impart and decelerate the discharge flow of the molten steel discharged from the immersion nozzle to the mold by applying electromagnetic force to the molten steel; And a controller configured to acquire a flow direction of the molten steel and a profile of the molten slag layer from the image photographed by the camera, and to variably control the amount of current supplied to the EMS device according to the minimum thickness and position of the obtained profile. It features.

The control unit varies the amount of current supplied to the EMS device when the minimum thickness is less than the set value, and the control unit increases the amount of current in the acceleration mode and decreases the amount of current in the deceleration mode when the minimum thickness exists in the center of the mold. When present at the edge of the mold is characterized in that the current amount in the acceleration mode to reduce the current amount in the deceleration mode.

The control unit is characterized in that for calculating the minimum thickness of the molten slag layer using a grid pattern.

In accordance with one aspect of the present invention, there is provided a method for controlling the flow of a floor, including: moving the surface of the molten steel to the camera by vertically and horizontally moving the surface of the molten steel in the mold; Obtaining a profile of the molten slag layer from the shape of the unmelted aluminum member and the current shape attached to the nail body in the image of the molten steel inspection device photographed through the camera; Calculating and obtaining the minimum thickness and position of the molten slag layer in the profile obtained above; Comparing the minimum thickness and the set value obtained in the above, and if the minimum thickness is less than the set value, varying the amount of current supplied to the EMS device in accordance with the acceleration or deceleration mode according to the position of the minimum thickness; It features.

The minimum thickness of the molten slag layer is calculated using a grid pattern formed on the aluminum member, wherein the set value is characterized in that 4mm to 6mm.

As described above, the present invention obtains a profile of the molten slag layer through image processing after photographing the surface of the surface of the surface, and automatically controls the current value supplied to the EMS device through the obtained profile, thereby providing efficient and convenient surface flow. Inspection is possible.

In addition, by forming a lattice pattern on the aluminum member and calculating the thickness of the molten slag layer through the formed lattice pattern in the surface flow inspection apparatus, accurate thickness of the molten slag layer can be calculated regardless of the perspective and the length of the nail. There is this.

1 is a side view showing a continuous casting machine related to an embodiment of the present invention.
FIG. 2 is a conceptual view illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel M. Referring to FIG.
FIG. 3 is a conceptual view illustrating a distribution form of molten steel M in the mold of FIG. 2 and a portion adjacent thereto.
4a and 4b is a front view and a side view respectively showing the water surface flow inspection apparatus according to an embodiment of the present invention.
5 is a view showing the surface of the flow check system according to the present invention.
Figure 6 is a view showing the melt flow inspection apparatus and the mold according to the present invention.
7a and 7b are views showing the flow direction and the thickness of the slag layer during high speed casting and low speed casting.
8 is a flow chart showing the flow surface inspection procedure according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. Like elements in the figures are denoted by the same reference numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Continuous casting is a casting method in which castings or steel ingots are continuously drawn while solidifying molten metal in a mold without a bottom. Continuous casting is used to manufacture simple products such as squares, rectangles, circles, and other simple cross-sections, and slab, bloom and billets, which are mainly for rolling.

The type of continuous casting machine is classified into vertical type, vertical bending type, vertical axis difference bending type, curved type and horizontal type. 1 and 2 illustrate a curved shape.

1 is a side view showing a continuous casting machine related to an embodiment of the present invention.

Referring to this drawing, the continuous casting machine may include a tundish 20, a mold 30, secondary cooling tables 60 and 65, a pinch roll 70, and a cutter 90.

The tundish 20 is a container that receives molten metal from the ladle 10 and supplies molten metal to the mold 30. Ladle 10 is provided in a pair, alternately receives molten steel to supply to the tundish 20. In the tundish 20, the supply rate of molten metal flowing into the mold 30 is adjusted, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag layer and the non-metallic inclusion are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 has a pair of structurally opposed faces open to form a hollow portion for receiving molten steel. In the case of manufacturing a slab, the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers. Here, the short wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated away from or close to each other to have a certain level of taper. This taper is set to compensate for shrinkage caused by solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 has a strong solidification angle or solidifying shell 81 (see FIG. 2) such that the castings drawn from the mold 30 maintain their shape and do not leak molten metal which is still less solidified. It serves to form. The water-cooled structure includes a method of using a copper pipe, a method of drilling a water cooling groove in the copper block, and a method of assembling a copper pipe having a water cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricant is used to reduce friction between the mold 30 and the casting during oscillation and to prevent burning. Lubricants include splattered flat oil and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become a slag layer, and the lubrication of the mold 30 and the casting, as well as the oxidation and nitriding prevention and thermal insulation of the molten metal in the mold 30, and the non-metallic inclusions floating on the surface of the molten metal It also performs the function of absorption. In order to inject the powder into the mold 30, a powder feeder 50 is installed. The part for discharging the powder of the powder feeder 50 faces the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spray 65 spraying water while maintaining the solidification angle by the support roll 60 so as not to deform. Casting solidification is mostly achieved by the secondary cooling.

The drawing device adopts a multidrive method using a plurality of sets of pinch rolls 70 and the like so that the casting can be taken out without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The cutter 90 is formed to cut continuously produced castings to a constant size. As the cutter 90, a gas torch, a hydraulic shear, or the like can be employed.

FIG. 2 is a conceptual view illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel M. Referring to FIG.

Referring to this figure, the molten steel (M) is to flow to the tundish 20 in the 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 to be immersed in the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrified. 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. The rear portion along the casting direction of the strand 80 is formed by the non-solidified molten steel 82 being wrapped around the solidified shell 81 in which the molten steel M is solidified by the method in which the peripheral portion first solidifies.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the fully solidified strand 80, 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 65 for spraying cooling water in the course of the above movement. This causes the thickness of the uncooled steel (82) in the strand (80) to gradually decrease. When the strand 80 reaches a point 85, the strand 80 is filled with the solidification shell 81 in its entire thickness. The solidified strand 80 is cut to a predetermined size at the cutting point 91 and divided into a product P such as a slab.

The shape of the molten steel M in the mold 30 and the portion adjacent thereto will be described with reference to FIG. 3. FIG. 3 is a conceptual view illustrating a distribution form of molten steel M in the mold 30 and adjacent portions of FIG. 2.

Referring to FIG. 3, a pair of discharge ports 25a are typically formed on the end side of the immersion nozzle 25 on the left and right in the drawing. The shapes of the mold 30 and the immersion nozzle 25 are assumed to be symmetrical with respect to the center line C, and thus only the left side is shown in this drawing.

The molten steel M discharged together with the argon (Ar) gas from the discharge port 25a draws a trajectory flowing in the upward direction A1 and downward direction A2 as indicated by arrows A1 and A2. do.

The powder layer 51 is formed on the upper part of the mold 30 by the powder supplied from the powder feeder 50 (see FIG. 1). The powder layer 51 may include a layer existing in a form in which the powder is supplied and a layer sintered by the heat of the molten steel M (sintered layer is formed closer to the unsolidified molten steel 82). Below the powder layer 51 is a slag layer 52 formed by melting the powder by molten steel (M). The slag layer 52 maintains the temperature of the molten steel M in the mold 30 and blocks the penetration of foreign matter. A portion of the powder layer 51 solidifies at the wall surface of the mold 30 to form the lubrication layer 53. The lubrication layer 53 functions to lubricate the solidified shell 81 so as not to stick to the mold 30.

The thickness of the solidification shell 81 becomes thicker as it progresses along the casting direction. The portion of the solidification shell 81 in which the mold 30 is positioned is thin, and an oscillation mark 87 may be formed by oscillation of the mold 30. The solidification shell 81 is supported by the support roll 60, and the thickness thereof is thickened by the spray 65 for spraying water. The solidification shell 81 may be thickened and a bulging region 88 may be formed in which a portion protrudes convexly.

4a and 4b is a front view and a side view respectively showing the water surface flow inspection apparatus according to an embodiment of the present invention.

Floor flow inspection apparatus 110 includes a support bar 111, a frame 113, a nail 115 and an aluminum member 117 as shown.

The support bar 111 is a part fixedly installed on the moving unit 130 or gripped by the user, and the frame 113 is a member on which the nails 115 are mounted. Although not shown in detail, the moving unit 130 is operated according to a control signal to serve to move the floor flow inspection apparatus 110 horizontally and vertically (x, y and z axes). For example, the support bar 111 of the floor surface flow inspection apparatus 110 is fixedly installed on the arm 131 of the movement means 130, and the surface flow inspection apparatus 110 is horizontally and horizontally driven according to the operation of the movement means 130. Moved vertically. Here, the moving means 130 may include a cylinder and a motor.

Nail (115) is at least one member that is mounted and fixed to the frame 113 at regular intervals, each nail 115 is fixed to one end mounted on the frame 113 and the other end is immersed in the molten steel 82 It is formed so as to extend, the insertion groove 116 of a predetermined length is formed at the other end. The nails 115 may be mounted and fixed in a row on the frame 113. The nail 115 is a steel-based material, the length may be about 100mm to about 200mm, the length of the insertion groove 116 may be about 50% to about 70% of the length of the nail (115). .

The aluminum member 117 is forcibly inserted into the insertion grooves 116 of the nails 115, and the length of the insertion groove 116 and the height of the aluminum member 117 are preferably the same. In addition, although the aluminum member 117 may be fixedly inserted into the insertion groove 116 and fixed, the aluminum member 117 may be fixed to the nail 115 by a screw or a latch. On the aluminum member 117, a lattice pattern 118 is printed or engraved. The grid may be formed at intervals of 1 mm to 10 mm.

That is, the plurality of nails 115 are fixedly installed at predetermined intervals in the frame 113, and insertion grooves 116 are formed at the bottom of each nail 115, and the single aluminum member 117 is formed in the insertion grooves 116. ) Is inserted and fixed. The profile of the slag layer 52 can be more accurately evaluated by immersing the steel nail 115 and the aluminum member 117 in the same position in the mold 30.

The steel-based nail 115 is not melted in the molten slag layer 52 and the non-solidified molten steel 82 in which the powder is melted, but the aluminum member 117 inserted in the nail 115 is not melted in the powder layer, but the molten slag It melts in layer 52 and unsolidified molten steel 82. On the basis of the difference in these characteristics, when comparing the height of the molten aluminum member 117 and the now 119 attached to the nail 115 in which the aluminum member 117 is melted, the thickness of the molten slag layer 52 is confirmed. It becomes possible. Furthermore, according to the molten shape of the aluminum member 117 and the shape of the now 119 attached to the nail 115 body, it is also possible to check the flow direction of the molten steel.

Figure 5 is a view showing the flow rate flow inspection system according to the present invention, Figure 6 is a view showing the flow rate flow inspection apparatus and the mold according to the present invention.

As shown in FIG. 5, the floor flow inspection system includes a memory 120, a moving unit 130, a camera 140, a controller 170, an EMS (Electro Magnetic Stirrer) device 180, and the like.

The memory 120 stores a photographed image of the water level flow inspection apparatus 110, or a current value of the EMS device 180 and movement information of the moving unit 130 in an acceleration or deceleration mode.

The moving means 130 moves horizontally and vertically in the molten steel flow inspection device 110 fixedly coupled to the arm 131 according to a control signal, and then, after a predetermined time passes, the molten steel is immersed by immersing the molten steel in the mold 30. To be removed from the The moving means 130 may be composed of a cylinder and a motor.

The camera 140 photographs the water level flow inspection apparatus 110 extracted from the molten steel and outputs the photographed image to the controller 170.

The display unit 150 displays an image of the shot surface flow inspection apparatus 110, and the input unit 160 is configured to input various setting data and control commands.

The control unit 170 determines the flow direction of the molten steel from the shape of the aluminum member 117 remaining without melting from the photographed image or the shape of the now 119 attached to the nail 115 body, and to the nail 115 body. The profile of the molten slag layer 52 is analyzed using the top position of the now attached 119 and the shape of the aluminum member 117 remaining unmelted. The lattice pattern 118 is printed or engraved on the aluminum member 117, so that the shape of the lattice pattern 118 remaining after melting is not melted, can be read as an image, and the control unit 170 controls the lattice pattern 118. The remaining height of the aluminum member 117 can also be easily calculated. In addition, the control unit 170 recognizes the interval between the graduations in advance in the grid pattern 118, regardless of the photographing distance (perspective) of the water surface flow inspection device 110, the accurate calculation of the actual interval through the grid pattern 118 and Conversion is possible.

The controller 170 basically controls the EMS device 180 to control the flow rate of the hot water surface by accelerating and decelerating the discharge flow of the molten steel discharged from the immersion nozzle 25. The current value of 180, that is, the amount of current applied to the electromagnetic coil of the EMS device 180 or the current direction is controlled.

Therefore, the control unit 170 obtains the flow direction of the molten steel and the profile of the molten slag layer 52 through the image obtained through the surface flow inspection apparatus 110, and through the obtained profile of the molten slag layer 52 After obtaining the minimum thickness and its position, the current amount of the EMS device 180 is variably controlled according to the minimum thickness and the position thereof.

In the above, the controller 170 determines whether there is a point where the minimum thickness of the molten slag layer 52 is less than or equal to a predetermined value, for example, about 5 mm or less, based on the obtained profile of the molten slag layer 52. The amount of current applied to the EMS device 180 may be corrected by approximately 10% based on the current amount of current according to the position where the thickness becomes 5 mm or less. For example, when the position of the minimum slag layer 52 exists in the center of the mold 30, the amount of current is increased by about 10% in the acceleration mode, and the amount of current is reduced by about 10% in the deceleration mode. In addition, when the position of the minimum slag layer 52 is located at the edge of the mold 30, the amount of current is reduced by about 10% in the acceleration mode, and the amount of current is increased by about 10% in the deceleration mode.

The EMS device 180 is disposed around the outer side of the mold 30 as shown in FIG. 6 and includes an electromagnetic coil. The EMS device 180 applies the electromagnetic force to the molten steel to accelerate and decelerate the discharge flow of the molten steel discharged from the immersion nozzle 25 by the electromagnetic force to control the flow rate of the hot water surface. In general, in high speed casting, the molten steel discharged from the immersion nozzle 25 is decelerated through the deceleration mode (the moving direction by the magnetic field is toward the immersion nozzle), and in the low speed casting, the acceleration mode (the moving direction by the magnetic field is toward the mold edge). It accelerates the molten steel discharged from the immersion nozzle 25 through. The acceleration mode and the deceleration mode are performed by controlling the direction of the current applied to the electromagnetic coil, and the strength of the magnetic field may be changed by adjusting the amount of current applied to the electromagnetic coil.

In the case of high speed casting, as shown in FIG. 7A, the minimum thickness of the slag layer 52 is formed at the edge of the mold 30 by molten steel flow, and in the case of low speed casting, the minimum thickness of the slag layer 52 as shown in FIG. 7B. The thickness is formed in the center portion of the mold 30 around the immersion nozzle 25. Basically, the profile of the slag layer 52 is different in thickness by position.

3 and 6, the powder layer 51 is formed on the inside of the mold 30 by the powder supplied from the outside. The powder layer 51 may include a molten slag layer 52, which is a layer sintered by the heat of molten steel M and a layer existing in a form in which powder is supplied. Below the powder layer 51 is a slag layer 52 formed by melting the powder by molten steel (M). The slag layer 52 maintains the temperature of the molten steel M in the mold 30 and blocks the penetration of foreign matter. A portion of the powder layer 51 solidifies at the wall surface of the mold 30 to form the lubrication layer 53.

As such, the controller 170 controls the discharge flow of the molten steel through the EMS device 180 in the accelerated mode or the decelerated mode, but since the inside of the immersion nozzle 25 for supplying the molten steel to the mold 30 is casting. You get stuck. Therefore, even if several casting conditions (casting width, casting speed, casting thickness, Ar injection amount, immersion nozzle immersion depth, current value, etc.) are the same, the internal shape of the immersion nozzle 25 is changed so that the molten steel flow state in the mold 30 is changed. It will be out of the desired flow state. Accordingly, the molten steel flow state during the casting is evaluated in a short time to change the current condition of the EMS device 180.

8 is a flow chart illustrating a flow rate inspection procedure according to the present invention, which will be described with reference to FIGS. 5 to 7.

First, the controller 170 controls the moving means 130 when the water level flow test time is set in the memory 120 or when the water surface flow test command is input from the input means 160 (S1). The 110 is moved horizontally and vertically so as to be immersed into the mold 30 (S2). Here, only the nail 115 of the water surface flow inspection apparatus 110 is immersed in the molten steel, and the frame 113 is located outside the molten steel without being immersed.

When the nail 115 is immersed in the molten steel as described above, the steel-based body does not melt in the molten slag layer 52 and the non-solidified molten steel 82 in which the powder is melted, but the aluminum member 117 inserted into the body is a powder layer. Although not melted in the molten slag layer 52 and the non-solidified molten steel (82).

When the set time elapses, the control unit 170 controls the moving unit 130 again to remove the water level flow inspection apparatus 110 from the molten steel and move it to the camera 140 (S3). When the water surface flow inspection apparatus 110 is removed from the molten steel, the aluminum member 117 is melted from the molten slag layer 52 and the molten steel, and the aluminum member 117 is melted, as shown in the nail 115 of FIG. 5. The state 119 is now attached.

Subsequently, the camera 140 photographs the molten steel molten steel inspection apparatus and outputs the photographed image to the controller 170 (S4).

The controller 170 determines the flow direction of the molten steel from the shape of the aluminum member 117 remaining without melting from the photographed image and the shape of the now 119 attached to the nail 115 body. If the right side of the aluminum member 117 is further melted as shown in FIG. 5 and the right side of the now 119 is stacked higher than the left side, it can be seen that the flow direction of the molten steel is from right to left. . Of course, if the left part of the aluminum member 117 is further melted and the left part of the now 119 is stacked higher than the right side, the flow direction of the molten steel becomes from left to right.

In addition, the controller 170 uses the top surface of the now 119 attached to the nail 115 body and the hot water profile including the thickness of the molten slag layer 52 by using the remaining height of the aluminum member 117 remaining unmelted. To obtain (S5).

Subsequently, the controller acquires the minimum thickness and the position of the molten slag layer through the obtained profile (S6). Here, the thickness of the molten slag layer 52 is the interval between the lower end of the aluminum member 117 and the upper end of the now 119. In the above-described aluminum member 117, the grid pattern 118 (▦) is printed or engraved, so that the shape of the aluminum member 117 remaining without melting after being immersed can be read as an image, and the control unit 170 is a grid pattern Since the gap between the scales is recognized in advance in 118, the thickness of the molten slag layer 52 through the lattice height of the aluminum member 117 and the stack height of the now 119 through the grid pattern 118 can be accurately calculated. have.

Subsequently, the controller 170 determines whether there is a section in which the thickness of the molten slag layer 52 is less than or equal to a predetermined value through the extracted profile (S7). Here, the set value of the molten slag layer 52 may be about 4mm to 6mm.

If there is a section in which the minimum thickness of the molten slag layer is less than or equal to the set value, it is determined whether the position of the minimum thickness is the center portion (immersion nozzle portion) of the mold 30 or the edge (mold edge surface) of the mold 30. It is determined (S8).

When the position of the minimum thickness of the molten slag layer 52 is the center portion of the mold 30, the controller 170 increases the amount of current applied to the electromagnetic coil under the acceleration mode of the EMS device 180, and the EMS device. Under the deceleration mode of 180, the amount of current applied to the electromagnetic coil is reduced (S9). On the other hand, when the position of the minimum thickness of the molten slag layer 52 is the edge of the mold 30, the control unit 170 reduces the amount of current applied to the electromagnetic coil under the acceleration mode of the EMS device 180, Under the deceleration mode of the EMS device 180, the amount of current applied to the electromagnetic coil is increased (S10). In this case, the amount of increase or decrease is preferably adjusted at about 10% of the current amount.

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 25: Immersion Nozzle
30: mold 40: mold oscillator
50: powder feeder 51: powder layer
52: liquid fluidized bed 53: lubricating layer
60: support roll 65: spray
70: pinch roll 80: strand
81: solidified shell 82: unsolidified molten steel
83: tip 85: solidification completion point
87: oscillation mark 88: bulging area
90: cutting machine 91: cutting point
110: flow surface inspection device 111: support bar
113: frame 115: nail
116: insertion groove 117: aluminum member
130: vehicle 140: camera
170: control unit 180: EMS device

Claims (15)

frame;
A nail having one end mounted and fixed to the frame, the other end extending to be immersed in molten steel, and a nail having an insertion groove having a predetermined length formed at the other end; And
And an aluminum member fixedly installed in the insertion groove of the nail and immersed in the molten steel together with the nail.
The method of claim 1,
The nail surface flow inspection apparatus is mounted in a line at a predetermined interval on the frame.
The method of claim 1,
And the aluminum member is a single plate member fitted into an insertion groove of the nail arranged in a line.
The method of claim 1,
The floor surface flow inspection apparatus, characterized in that the lattice pattern (프린트) is printed or engraved on the aluminum member.
A tang surface flow inspection apparatus for immersing in molten steel in a mold to inspect a flow direction of the molten steel and a profile of a molten slag layer;
Moving means for immersing or extracting the molten metal flow inspection device by moving it horizontally and vertically into molten steel in a mold;
A camera for photographing the molten steel inspection device taken out of the molten steel;
An EMS (Electro Magnetic Stirrer) device disposed around the outside of the mold to impart electromagnetic force to the molten steel to accelerate and decelerate the discharge flow of the molten steel discharged from the immersion nozzle to the mold; And
And a controller for acquiring the flow direction of the molten steel and the profile of the molten slag layer from the image photographed by the camera, and controlling the amount of current supplied to the EMS device according to the minimum thickness and the position of the obtained profile. Control system.
The method of claim 5, wherein
Wherein the controller is the flow surface control system for varying the amount of current supplied to the EMS device when the minimum thickness is less than the set value.
The method of claim 5, wherein
The controller increases the amount of current in the acceleration mode when the minimum thickness is in the center of the mold, decreases the amount of current in the deceleration mode, decreases the amount of current in the acceleration mode when the minimum thickness is at the edge of the mold, and increases the amount of current in the deceleration mode. A water surface flow control system, characterized in that.
The method of claim 5, wherein
The water surface flow inspection device,
frame; A nail having one end mounted and fixed to the frame, the other end extending to be immersed in molten steel, and a nail having an insertion groove having a predetermined length formed at the other end; And a plate-shaped aluminum member fixedly installed in the insertion groove of the nail and immersed in the molten steel together with the nail.
The method of claim 8,
The nail surface flow control system is arranged to be mounted in a row at a predetermined interval on the frame.
The method of claim 8,
The floor surface flow control system, characterized in that the lattice pattern is printed or engraved on the aluminum member.
The method of claim 10,
The control unit calculates the minimum thickness of the molten slag layer using the grid pattern processed on the aluminum member.
The control unit comprises the step of moving the water surface flow test device immersed in the molten steel in the mold vertically and horizontally to the camera side;
Obtaining a profile of the molten slag layer from the shape of the unmelted aluminum member and the current shape attached to the nail body in the image of the molten steel inspection device photographed through the camera;
Calculating and obtaining the minimum thickness and position of the molten slag layer in the profile obtained in the step; And
Comparing the minimum thickness and the set value obtained in the step, and if the minimum thickness is less than the set value, varying the amount of current supplied to the EMS device according to the acceleration or deceleration mode according to the position of the minimum thickness; Flow control method.
The method of claim 12,
The minimum thickness of the molten slag layer is calculated using the grid pattern formed on the aluminum member.
The method of claim 12,
The set value is the flow surface control method, characterized in that 4mm to 6mm.
The method of claim 12,
When the minimum thickness is present in the center of the mold increases the amount of current in the acceleration mode, decreases the amount of current in the deceleration mode, decreases the amount of current in the acceleration mode and increases the amount of current in the deceleration mode if the minimum thickness is present at the mold edge How to control the flow of water.

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