KR101797376B1 - Apparatus and method for preventing over run in coil box - Google Patents

Abstract

According to an embodiment of the present invention, an overrun prevention device for a coil box comprises: an overrun determination portion configured to, after extracting an edge image of a coil from an image of a front surface and a side surface of the coil wound in a coil box, an overrun determination signal to determine that an overrun is able to occur by comparing a pixel position value of an extracted edge area with an overrun reference pixel position value; and an overrun prevention portion to control a heading direction of the coil by regulating a roll gap between a pair of an upper bending roll and a lower bending roll after decelerating an entry speed of the coil entering a coil box based on the overrun determination signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an over-

The present invention relates to an apparatus and a method for preventing a coil box overrun to prevent an overrun phenomenon, which is one of major obstacles of a coil box between a roughing mill and a finishing mill in a hot rolling process.

1 is a process drawing showing a continuous hot-rolling continuous process.

As shown in FIG. 1, the hot-rolling continuous process includes a coil-bow process, a joining process, and a winding process.

In the coil box process, coiling and uncoiling operations are performed using a coil box, which has passed through rough rolling, to ensure a uniform material temperature and function as a buffering for bonding. do. Then, the front and rear ends of the preceding and succeeding materials are removed to bond the material, and the shape is corrected through a leveler.

The bonding process refers to bonding the overlapped preceding and succeeding materials with the adhesive using a shear solid-state bonding method. In this case, the upper and lower claws are removed by the grab remover after the adapter.

The winding step is a step of cutting the jointed parts by high speed shear after the finishing rolling and continuously winding them on the respective winding machines (Units 1 and 2).

On the other hand, installing a coil box reduces the length of the rolling line, thereby reducing the construction cost of the plant. In addition, by reducing the heat loss through rolling using the coil box and reducing the temperature difference between the leading and trailing ends of the coil, have.

In such a coil box, the operation setting and condition of the equipment, the leading end and the trailing end of the coil are important factors for stable operation in winding the coil and transferring the coil.

FIG. 2 is a configuration diagram of a coil box, and FIG. 3 is a flowchart showing a state in which a coil is coiled in a coil box. Referring to FIGS. 2 and 3, in a coiling process, a deflector roll And is bent in the direction of curvature by the initial gap of the bending roll to start coiling and finally finish. In the uncoiling process, uncoiling is started by the peeler after the coiled material is completed, and it proceeds through the cradle rolls (# 1 to # 3) and finally the pinch roll And the uncoiling is completed.

FIG. 4 is a view showing an initial state of the coil box coiling. Referring to FIG. 4, in the coiling process, a coil eye is formed by initial gap setting of the bending roll, and the coil ring is advanced. At this time, if the coil eye can not be ideally generated at the initial stage, a coil eye having a shape such as a duck, an ellipse, or the like is generated. Here, the coil eye refers to a circular shape formed in the inner winding portion when the coil box is coiled.

On the other hand, in the coil box, due to the defective shape of the coil, the progress of the coil, the diameter of the overrun coil, and the defective position control of the leading end of the coil, As shown in FIG. 5, it is assumed that the overrun phenomenon is caused by the bending roll gap between the upper bending roll and the lower bending roll, but the exact cause of the overrun phenomenon is not understood. There is no countermeasure.

The following Patent Document 1 relates to a continuous hot rolling apparatus, but fails to provide a solution to the above-mentioned problems.

Korean Patent Registration No. 10-2003-0028826

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide an overrun- And it is also advantageous in that the occurrence of overrun can be prevented by changing the rolling line speed in accordance with the pattern and changing the bending roll gap.

An overrun prevention apparatus for a coil box according to an embodiment of the present invention extracts an edge image of a coil from an image of a front surface and a side surface of a coil wound in a coil box, An overrun determining unit that detects an overrunning determination signal that indicates that an overrunning may occur through comparison between a position value and an overrun reference pixel position value; And an overrun prevention unit for controlling the advancing direction of the coil by regulating the roll gap between the pair of upper bending rolls and the lower bending rolls after decelerating the entry speed of the coil entering the coil box based on the overrun decision signal.

The overrun determining unit includes an image input unit for receiving an image of a coil wound in a coil box and generating an image signal; An edge detection area setting unit for setting an edge detection area for detecting an edge of the coil in the image signal; A reference pixel position value calculator for calculating an overrun reference pixel position value according to the width of the coil in the edge detection area; An edge detection unit for detecting an edge of the coil in the edge detection area; And an overrun discrimination unit for discriminating whether an overrun of the coil box is possible by comparing the overrun reference pixel position value with a pixel position value of the detected edge.

The over-run preventing device of the coil box further includes a noise removing unit for removing noise included in the image signal.

The noise removing unit removes noise included in the image signal using a Gaussian normal distribution.

The over-run preventing device of the coil box further includes an offset adjusting unit for adjusting the overrun reference pixel position value according to a user's input.

The overrun prevention unit includes a coil entry speed calculation unit that is operated based on the overrun determination signal and calculates a decelerated coil entry speed by applying a weight calculated by the width and thickness of the coil to the current coil entry speed. A coiling speed compensator for compensating a time delay due to a decelerated coil entry speed by controlling a coiling speed of the coil; And a bending roll gap controller for adjusting the roll gap between the pair of upper bending rolls and the lower bending roll to control the traveling direction of the coils.

The coil entry speed calculation unit calculates the decelerated coil entry speed using the following expression (2).

[Formula 2]

V ' _coil = α × V _coil (0.5 < alpha < 1)

Here, V _coil is the reference coil entry speed, V ' _coil is the decelerated coil entry speed recalculated at the occurrence of the overrun occurrence possible signal, and a is the weight calculated by the width and thickness of the coil.

The coiling speed compensating unit compensates the time delay due to the decelerated coil entry speed by using the following Equations 3 to 5 by controlling the coiling speed of the coil.

[Formula 3]

Y = V ₁ * T ₁ + V ₂ * T ₂ = Reference speed (vref) * reference time (tref)

[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling speed V ' _coil , V ₂ is the increased coiling speed V' _{coil ,} T ₁ is the reduced coiling speed holding time, T ₂ is the increased coiling rate It means time.

Upon receiving the overrun determination signal, the bending roll gap controller calculates a roll gap between a pair of the upper bending roll and the lower bending roll using Equation (6) according to the width and thickness of the coil.

[Formula 6]

와

는 강판의 폭과 속도에 의해 결정되는 상수이다.
Here, the first bending roll gap (Roll_Gap _A ) is the gap between the first upper bending roll and the lower bending roll, the second bending roll gap (Roll_Gap _B ) is the gap between the second upper bending roll and the lower bending roll, Roll_Gap _ref means the reference gap. Then,

Wow

Is a constant determined by the width and speed of the steel sheet.

The overrun prevention method of a coil box according to an embodiment of the present invention includes extracting an edge image of a coil from an image of a front surface and a side surface portion of a coil wound in a coil box and then extracting a pixel position value of the extracted edge area and an overrun reference pixel position value An overrun determination step of determining whether an overrun occurrence is possible through comparison between the overrun decision signal and the overrun decision signal; And

An overrun prevention step of controlling the coiling progress direction of the coil by regulating the roll gap between the pair of upper bending rolls and the lower bending rolls after decelerating the entry speed of the coils entering the coil box on the basis of the overrun judgment signal .

The overrun determining step may include: generating an image signal by receiving an image of a coil wound in a coil box; Setting an edge detection area for detecting an edge of the coil in the image signal; Calculating an overrun reference pixel position value according to a width of the coil in the edge detection area; Detecting an edge of the coil in the edge detection area; And comparing the overrun reference pixel position value with a pixel position value of the detected edge to determine whether overrun occurrence of the coil box is possible.

The overrun prevention method of the coil box further includes a step of removing noise included in the image signal after the generation of the image signal.

The step of removing the noise is a step of removing noise included in the image signal using a Gaussian normal distribution.

The overrun prevention step may include calculating a reduced coil entry speed by applying a weight calculated by the width and thickness of the coil to the reference coil entry speed in the coil entry speed calculation unit. Controlling a coiling speed of the coil to compensate for a time delay due to a reduced coil entry speed; And adjusting the roll gap between the pair of upper bending rolls and the lower bending rolls to control the traveling direction of the coils.

The step of calculating the decelerated coil entry speed is a step of calculating the decelerated coil entry speed using the following expression (2).

[Formula 2]

V ' _coil = α × V _coil (0.5 < alpha < 1)

Here, V _coil is the reference coil entry speed, V ' _coil is the decelerated coil entry speed recalculated at the occurrence of the overrun occurrence possible signal, and a is the weight calculated by the width and thickness of the coil.

The step of compensating for the time delay is a step of compensating the time delay due to the reduced coil entry speed by using the following Equations 3 to 5 by controlling the coiling speed of the coil in the coiling speed compensator.

[Formula 3]

Y = V ₁ * T ₁ + V ₂ * T ₂ = Reference speed (vref) * reference time (tref)

[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling speed V ' _coil , V ₂ is the increased coiling speed V' _{coil ,} T ₁ is the reduced coiling speed holding time, T ₂ is the increased coiling rate It means time.

The step of controlling the traveling direction of the coil may include calculating a roll gap between the pair of upper bending rolls and the lower bending roll by a bending roll gap calculating unit using the following formula 6 according to the width and thickness of the coil .

[Formula 6]

와

는 강판의 폭과 속도에 의해 결정되는 상수이다.
Here, the first bending roll gap (Roll_Gap _A ) is the gap between the first upper bending roll and the lower bending roll, the second bending roll gap (Roll_Gap _B ) is the gap between the second upper bending roll and the lower bending roll, Roll_Gap _ref means the reference gap. Then,

Wow

Is a constant determined by the width and speed of the steel sheet.

Advantageously, using the apparatus and method for preventing over-coiling of a coil box according to an embodiment of the present invention, an occurrence of an overrun of a coiled coil in the coil box can be prevented early.

1 is a process drawing showing a continuous hot-rolling continuous process.
2 is a configuration diagram of the coil box.
3 is a flowchart showing a state in which coils are coiled in a coil box,
4 is a view showing an initial state of the coil box coil ring.
5 is a photograph showing the overrun of the coil box.
6 is a block diagram showing a coil box overrun prevention apparatus according to an embodiment of the present invention.
7 is a block diagram showing an embodiment of the overrun decision unit of FIG.
8 is a block diagram showing another embodiment of the overrun decision unit of FIG.
9 is a diagram for explaining an operation of calculating an overrun reference pixel position value of the reference pixel position value calculating unit of FIG.
10 is a block diagram showing the overrun prevention unit of FIG.
11 is a graph for explaining a coil entry speed of the coil entering the coil box.
12 is a side view of the coil box at the time when the coil is wound.
13 is a method flow diagram of a method for preventing coil box overrun according to an embodiment of the present invention.
14 is a flowchart showing S710 shown in FIG. 13 in more detail.
15 is a flowchart showing S720 shown in FIG. 13 in more detail.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

Hereinafter, an apparatus and method for preventing a coil box overrun according to an embodiment of the present invention will be described in detail with reference to the drawings.

First, before explaining the present invention, an overrun will be briefly described.

Overrun is a phenomenon in which a coil can not be normally coiled during winding in a coil box, and is piled up in an accordion shape on a cradle roll or protrudes to the cradle roll 2-3 while the coil is not completely formed during winding.

Typically, overruns lead to large failures in which the line is shut down for more than an hour.

6 is a block diagram showing a coil box overrun prevention apparatus according to an embodiment of the present invention.

Referring to FIG. 6, the overrun determining unit 200 and the coiling speed controller 300 may include a coil overrun prevention apparatus 100 according to an exemplary embodiment of the present invention.

The overrun determination unit 200 extracts the edge image of the coil from the images of the front and side portions of the coil wound in the coil box, and then the overrun occurrence occurs through comparison between the pixel position value of the extracted edge region and the overrun reference pixel position value Is detected.

More specifically, the overrun determination unit 200 includes an image input unit 210, an edge detection area setting unit 220, a reference pixel position value calculation unit 230, an edge detection unit 240, and an overrun determination unit 250 .

The image input unit 210 is for capturing a coil 1 wound in a coil box. The image input unit 210 receives an image of the coil 1 wound in the coil box, and generates an image signal.

The edge detection area setting unit 220 may set an edge detection area for detecting the edge of the coil 1 from the image signal generated by the image input unit 210. [ Here, the edge detection area may be set to include at least one of the left or right edges of the coil 1.

In one embodiment, the edge detection area may be set as an area between the first line 2 and the second line 3, as in FIG. 9, and the first line 2 and the second line 3 (Pixel position value) can be set by user input. And sets an edge detection area for detecting an edge of the coil in the image signal.

The reference pixel position value calculation unit 230 may calculate an overrun reference pixel position value according to the width of the coil 1 in the edge region set by the edge detection region setting unit 220. [

In one embodiment, the reference pixel position value calculator 230 multiplies the difference between the width of the reference coil and the width of the coil to be wound by the variation amount of the pixel position value according to the width variation and adds the multiplication to the pixel position value of the reference coil The overrun reference pixel position value of the coil to be wound can be calculated.

Specifically, the overrun reference pixel position value can be calculated by the following equation (1).

[Formula 1]

Where P is the overrunning pixel position value, W is the width of the coil, G is the pixel position value change weight for the width variation of the coil, A is the pixel position value of the edge when the width of the coil is 1000 mm have. Here, the values of G and A may be values preset by pre-measurement or user input.

For example, FIG. 9 is a diagram for explaining an operation of calculating an overrun reference pixel position value of the reference pixel position value calculation unit of FIG. 7, wherein the edge The edge detection area setting unit 120 sets the pixel position value of the first line 2 to 400 and the pixel position value of the first line 2 to 400 so that the right edge of the coil 1 is included as shown in FIG. 3 may be set to 550. [ Also, in the image signal generated by the image input unit 110, if the variation amount of the pixel position value per 10 mm of the width of the coil 1 is 1, the G value may be set to 0.1.

Here, when the coil 1 having a width of 800 mm is wound, the overrun reference pixel position value calculated by Equation 1 can be 440. It can be seen that this is a value shifted by 20 pixels to the left than when a coil with a width of 1000 mm is wound. When a coil of 1200 mm is wound under the above conditions, the overrun reference pixel position value may be 480.

Here, the overrun reference pixel position value calculated by the reference pixel position value calculator 230 may be calculated on the basis of a time (for example, 3 seconds) which takes a specific time from the time when the coil is wound up, 140 may detect the edge of the coil at that particular time.

The edge detection unit 240 can detect the edge of the coil in the edge detection area set by the edge detection area setting unit 120. [

The overrun determination unit 250 compares the pixel position value of the edge detected by the edge detection unit 240 with the overrun reference pixel position value calculated by the reference pixel position value calculation unit 230, .

More specifically, if the overrun determining unit 250 determines that the overrun is greater than the pixel position value of the edge detected by the edge detecting unit 140 and the overrunning reference pixel position value calculated by the reference pixel position calculating unit 130, Signal.

Here, the position values of the pixels to be compared may be the abscissa values of the pixels.

That is, the pixel position value in the two-dimensional image may have an abscissa value and an ordinate value. The overrun reference pixel position value calculated by the reference pixel position value calculation unit 230 and the overrun reference pixel position value calculated by the edge detection unit 240 The pixel position values of the edges of the pixels may all be abscissa values.

The overrun determining unit 250 may determine whether an overrun occurs by comparing the abscissa value of the overrun reference pixel position value with the abscissa value of the pixel position value of the edge.

Meanwhile, referring to FIG. 8, the overrun determining unit according to another embodiment of the present invention may further include a noise removing unit 260 and an offset adjusting unit. The noise removing unit 260 may be disposed between the image input unit 110 and the edge detection area setting unit 220 to remove noise included in the image signal generated by the image input unit 210. In one embodiment, the noise remover 260 may remove noise included in the image signal using a Gaussian normal distribution.

The offset adjuster 270 may adjust an overrun reference pixel position value calculated by the reference pixel position value calculator 230 according to a user's input.

For example, referring to FIG. 9, when a coil having a width of 800 mm is wound, the overrun reference pixel position value calculated by the reference pixel position value calculating unit 230 may be 440, The overrun reference pixel position value may be 465 and the overrun determination unit 250 may compare 465 with the pixel position value of the edge detected by the edge detection unit 240 It is possible to determine whether or not an overrun occurrence is possible.

FIG. 10 is a block diagram showing the overrun prevention unit of FIG. 6, and FIG. 11 is a graph for explaining the coil entry speed of the coil entering the coil box.

The overrun prevention unit 300 decelerates the entry speed of the coil that enters the coil box 10 based on the determination signal determined by the overrun determination unit 200 and then outputs a control signal to the pair of upper bending rolls 15a, The roll gap between the rolls 15c is controlled to control the traveling direction of the coil.

10, the overrun prevention unit 300 includes a coil entry speed calculation unit 310, a coiling speed compensation unit 320, and a bending roll gap control unit 330.

The coil entry speed calculation unit 310 is operated based on a determination signal and calculates a decelerated coil entry speed by applying a weight calculated by the width and thickness of the coil to the current coil entry speed.

At this time, the decelerated coil entry speed can be calculated using Equation 2 below.

[Formula 2]

V ' _coil = α × V _coil (0.5 < alpha < 1)

Here, V _coil is the reference coil entry speed, V ' _coil is the decelerated coil entry speed recalculated at the occurrence of the overrun occurrence possible signal, and a is the weight calculated by the width and thickness of the coil.

The coiling speed compensating unit 320 compensates the time delay due to the decelerated coil entry speed by using the following Equations 3 to 5 by controlling the coiling speed of the coil.

[Formula 3]

Y = V ₁ * T ₁ + V ₂ * T ₂ = reference speed (Vref) * reference time (Tref)

[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling rate, V ₂ is the increased coiling rate, T ₁ is the reduced coiling rate holding time, and T ₂ is the increased coiling rate holding time 8).

That is, the increased coiling speed V ₂ is determined by Equation 4, and the coil winding time at the coil box is the same.

The bending roll gap controller 330 adjusts the roll gap between the pair of upper bending rolls 15a and 15b and the lower bending roll 15c to adjust the roll gap between the pair of upper bending rolls 15a and 15b and the lower bending roll 15c, And controls the traveling direction of the coil.

For reference, the direction in which the steel plate is inserted in the coil box 10 is determined by the gap between one lower bending roll 15c and two upper bending rolls 15a and 15b.

When the bending roll gap controller 330 receives the overrun determination signal output from the overrun determining unit 200, the bending roll gap controller 330 calculates the overrun determining signal according to the width and the thickness of the coil using the following equation (6) Lt; / RTI &gt;

[Formula 6]

와

는 강판의 폭과 속도에 의해 결정되는 상수이다.
Here, the first bending roll gap (Roll_Gap _A ) is a gap between the first upper bending roll 15a and the lower bending roll 15c, and the second bending roll gap (Roll_Gap _B ) is a gap between the second upper bending roll 15b and the second upper bending roll 15b. And the lower bending roll 15c, and Roll_Gap _ref denotes the reference gap. Then,

Wow

Is a constant determined by the width and speed of the steel sheet.

When the bending roll gap controller 330 receives the overrun decision signal, the bending roll gap controller 330 increases the first bending roll gap to be greater than the reference gap so that the coiling progress direction of the coil advances toward the inner side of the coil box, To control the bending roll gap.

At this time, the roll gap change holding time may be changed by the user at a preset time. Further, the roll gap change holding time is set equal to the speed change time, and after the predetermined time, the roll gap change holding time is returned to the initial gap.

On the other hand, for reference, &quot; part &quot; disclosed in an embodiment of the present invention may be a computing device, and the computing device may include at least one processing unit and memory.

The processing unit may include a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) And may have a plurality of cores.

The memory may be a volatile memory (e.g., RAM, etc.), a non-volatile memory (e.g., ROM, flash memory, etc.), or a combination thereof.

The computing device may also include additional storage. Storage includes, but is not limited to, magnetic storage, optical storage, and the like.

The storage may store computer readable instructions for implementing one or more embodiments disclosed herein, and may also store other computer readable instructions for implementing an operating system, application programs, and the like. The computer readable instructions stored in the storage may be loaded into memory for execution by the processing unit.

As used herein, terms such as &quot; to &quot; refer generally to hardware, a combination of hardware and software, software, or computer-related entities that are software in execution. For example, an element may be, but is not limited to being, a processor, an object, an executable, an executable thread, a program and / or a computer running on a processor. For example, both the application running on the controller and the controller may be components. One or more components may reside within a process and / or thread of execution, and the components may be localized on one computer and distributed among two or more computers.

13 is a flowchart illustrating a method of preventing a coil box overrun according to an exemplary embodiment of the present invention. FIG. 14 is a flowchart illustrating S710 shown in FIG. 13 in more detail. Fig.

Referring to FIG. 13, a coil box overrun prevention method S700 according to an embodiment of the present invention extracts an edge image of a coil from an image of a front surface and a side surface of a coil wound in a coil box, (S710) of determining whether an overrun occurrence is possible by comparing the pixel position value of the overhang reference pixel position with the overrun reference pixel position value, and a step S710 of reducing the entry speed of the coil entering the coil box based on the overrun determination signal, And adjusting the roll gap between the roll and the lower bending roll to control the coiling direction of the coil (S720).

Referring to FIG. 14, in operation S710, the image input device 210 receives an image of a coil wound in a coil box to generate an image signal (S711), and then the edge detection area setting unit 220 sets the edge of the coil An edge detection area for detection is set (S712). Then, the reference pixel position value calculation unit 230 calculates an overrun reference pixel position value according to the width of the coil in the edge detection area (S713).

In step S713, the overrun reference pixel position value of the coil to be wound by multiplying the difference between the width of the reference coil and the width of the coil to be wound by the variation amount of the pixel position value according to the width change and adding to the pixel position value of the reference coil The overrun reference pixel position value is calculated by the following equation (1).

[Formula 1]

Where P is the overrunning pixel position value, W is the width of the coil, G is the pixel position value change weight for the width variation of the coil, A is the pixel position value of the edge when the width of the coil is 1000 mm have. Here, the values of G and A may be values preset by pre-measurement or user input.

Next, the edge detecting unit 240 detects the edge of the coil of the specific time in the edge detecting area (S714).

Here, the overrun reference pixel position value may be calculated on the basis of a time (for example, 3 seconds) at which a specific time is taken from the time when the coil is wound.

Next, the overrun determining unit 250 compares the overrun reference pixel position value with the pixel position value of the detected edge to determine whether an overrun of the coil box has occurred (S715).

The step S715 may determine that an overrun occurs when the pixel position value of the edge detected by the edge detector 240 and the overrun reference pixel value calculated by the reference pixel position value calculator 230 are greater than the overrun reference pixel position value.

In one embodiment, the method may further comprise removing noise included in the image signal between the step of generating an image signal (S711) and the step of setting an edge detection area (S712), and the step of removing noise May be a step of removing noise included in the image signal using a Gaussian normal distribution.

The overrun determination unit 200 extracts the edge image of the coil from the images of the front and side portions of the coil wound in the coil box, and then the overrun occurrence occurs through comparison between the pixel position value of the extracted edge region and the overrun reference pixel position value .

Referring to FIG. 15, in operation S720, the overrun prevention unit 300 decelerates the entry speed of the coil entering the coil box based on the overrun determination signal, So as to control the traveling direction of the coil.

More specifically, the step S720 is operated based on the overrun possibility determination signal in the coil entry speed calculation unit 310, and applies the weight calculated by the width and the thickness of the coil to the reference coil entry speed so that the reduced coil entry speed (S721).

At this time, the decelerated coil entry speed can be calculated using the following equation (2).

[Formula 2]

V ' _coil = α × V _coil (0.5 < alpha < 1)

Here, V _coil is the reference coil entry speed, V ' _coil is the decelerated coil entry speed recalculated at the occurrence of the overrun occurrence possible signal, and a is the weight calculated by the width and thickness of the coil.

Thereafter, the coiling speed of the coil is controlled by the coiling speed compensating unit 320 to compensate for the time delay due to the decelerated coil entering speed using the following Equations 3 to 5 (S722).

[Formula 3]

Y = V ₁ * T ₁ + V ₂ * T ₂ = Reference speed (vref) * reference time (tref)

[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling speed V ' _coil , V ₂ is the increased coiling speed V' _{coil ,} T ₁ is the reduced coiling speed holding time, T ₂ is the increased coiling rate (See FIG. 8).

That is, the increased coiling speed V ₂ is determined by Equation 4, and the coil winding time at the coil box is the same.
The unit of length is [mm] (millimeter), the unit of speed is [m / m] (meters / minute), and the unit of time is [sec] (seconds) in the above-mentioned [Expression 2] to [Expression 5].

Next, in the bending roll gap controller 330, the roll gap between the pair of upper bending rolls and the lower bending roll is controlled to control the advancing direction of the coils (S723).

For reference, the direction in which the coil is inserted in the coil box is determined by the gap between one lower bending roll and two upper bending rolls.

When the bending roll gap controller 330 receives the overrun determination signal output from the overrun determining unit 200, the bending roll gap controller 330 calculates the overrun determining signal according to the width and the thickness of the coil using the following equation (6) Lt; / RTI &gt;

[Formula 6]

와

는 강판의 폭과 속도에 의해 결정되는 상수이다.
Here, the first bending roll gap (Roll_Gap _A ) is the gap between the first upper bending roll and the lower bending roll, the second bending roll gap (Roll_Gap _B ) is the gap between the second upper bending roll and the lower bending roll, Roll_Gap _ref means the reference gap. Then,

Wow

Is a constant determined by the width and speed of the steel sheet.

When the bending roll gap controller 330 receives the overrun decision signal, the bending roll gap controller 330 increases the first bending roll gap to be greater than the reference gap so that the coiling progress direction of the coil advances toward the inner side of the coil box, To control the bending roll gap. At this time, the roll gap change holding time may be changed by the user at a preset time. Further, the roll gap change holding time is set equal to the speed change time, and after the predetermined time, the roll gap change holding time is returned to the initial gap.

Therefore, by using the apparatus and method for preventing overcollage of a coil box according to an embodiment of the present invention, an overrun phenomenon occurring in the coil box can be prevented in advance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made without departing from the scope of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to illustrate and not limit the scope of the technical spirit of the present invention. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

100: Overrun prevention device of coil box
200: Overrun judgment unit
210:
220: edge detection area setting unit
230: Reference pixel position value calculation unit
240: edge detector
250: overrun discrimination unit
260: Noise elimination
270:
300: overrun prevention part
310: coil entry speed calculation unit
320: Coil ring speed compensation unit
330: Bending roll gap controller

Claims (17)

An edge image of a coil is extracted from an image of a front surface and a side surface of a coil wound in a coil box and then an overrun decision signal indicating whether or not an overrun occurrence can be generated is output through comparison between a pixel position value of the extracted edge area and an overrun reference pixel position value An overrun determining unit;
When an overrun is determined based on the overrun decision signal, the velocity of the coil entering the coil box is reduced according to the weight of the coil and the thickness of the coil, And an overrun prevention part for controlling a moving direction of the coil by adjusting a roll gap,
The overrun prevention unit receives the overrun determination signal, and when the overrun prevention signal is received, the overrun prevention unit adjusts the first bending roll gap between the first upper bending roll and the lower bending roll of the pair of upper bending rolls Wherein the bending roll gap is controlled such that the second bending roll gap between the second upper bending roll and the lower bending roll of the pair of upper bending rolls is smaller than the reference gap, The overrun prevention device of the coil box is set to be equal to the speed change time for changing the entry speed of the coil, and compensates for the decelerated entry speed of the coil.
The method according to claim 1,
The over-
An image input unit for receiving an image of a coil wound in a coil box and generating an image signal;
An edge detection area setting unit for setting an edge detection area for detecting an edge of the coil in the image signal;
A reference pixel position value calculator for calculating an overrun reference pixel position value according to the width of the coil in the edge detection area;
An edge detection unit for detecting an edge of the coil in the edge detection area; And
And an overrun discriminating unit for discriminating whether an overrun of the coil box is possible by comparing the overrun reference pixel position value with a pixel position value of the detected edge.
3. The method of claim 2,
Further comprising a noise removing unit for removing noise included in the image signal.
The apparatus of claim 3,
An overrun prevention apparatus for a coil box that removes noise included in the image signal using a Gaussian normal distribution.
The method according to claim 1,
And an offset adjuster for adjusting the overrun reference pixel position according to a user's input.
The method according to claim 1,
The over-
A coil entry speed calculator operated based on the overrun decision signal and calculating a decelerated coil entry speed by applying a weight calculated by the width and thickness of the coil to the current coil entry speed;
A coiling speed compensator for compensating a time delay due to a decelerated coil entry speed by controlling a coiling speed of the coil; And
And a bending roll gap controller for adjusting a roll gap between the pair of upper bending rolls and the lower bending roll to control a traveling direction of the coils.
The method according to claim 6,
The coil entry speed calculation unit calculates,
The overrun prevention device of the coil box calculates the decelerated coil entry speed using the following equation (2).
[Formula 2]
V ' _coil = α × V _coil (0.5 <α <1)
Where V _coil is the reference coil entry velocity, V ' _coil is the recalculated coil entry velocity recalculated at the occurrence of the overrunning possible signal, a is the weight calculated by the width and thickness of the coil, and the unit of velocity is [m / m] (meters / minute).
The method according to claim 6,
Wherein the coiling speed compensating unit comprises:
And wherein the control unit controls the coiling speed of the coil to compensate the time delay due to the decelerated coil entry speed by using Equations 3 to 5 below.
[Formula 3]
Y = V ₁ * T ₁ + V ₂ * T ₂ = reference speed (Vref) * reference time (Tref)
[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling speed, V ₂ is the increased coiling speed, T ₁ is the reduced coiling speed holding time, T ₂ is the increased coiling speed holding time, The unit of time is [mm] (millimeter), the unit of speed is [m / m] (meters / minute), and the unit of time is [sec] (seconds).
The method according to claim 6,
The bending roll gap controller may include:
And when the overrun determination signal is received, calculates a roll gap between the pair of upper bending rolls and the lower bending roll using Equation (6) according to the width and thickness of the coil.
[Formula 6]

Here, the first bending roll gap (Roll_Gap _A ) is the gap between the first upper bending roll and the lower bending roll, the second bending roll gap (Roll_Gap _B ) is the gap between the second upper bending roll and the lower bending roll, Roll_Gap _ref means the reference gap. Then,

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Is a constant determined by the width and speed of the steel sheet.
An edge image of a coil is extracted from an image of a front side and a side face of a coil wound in a coil box and then an overrun judgment signal is determined by comparing the pixel position value of the extracted edge region and the overrun reference pixel position value, An overrun determination step And
When an overrun is judged to be generated based on the overrun judgment signal, the velocity of the coil entering the coil box is reduced according to the weight of the coil and the thickness of the coil, and then the distance between the pair of upper and lower bending rolls And an overrun prevention step of controlling the coiling progress direction of the coil by adjusting the roll gap,
The overrun prevention step may include a first bending roll gap between the first upper bending roll and the lower bending roll of the pair of upper bending rolls so that the direction of coil winding progresses inward of the coil box upon receiving the overrun determination signal, And the second bending roll gap between the second upper bending roll and the lower bending roll of the pair of upper bending rolls is controlled to be smaller than the reference gap, and the roll gap change holding time Wherein the speed change time is set to be the same as the speed change time for changing the entry speed of the coil, thereby compensating for the decelerated entry speed of the coil.
11. The method of claim 10,
In the overrun determination step,
Receiving an image of a coil wound in a coil box and generating an image signal;
Setting an edge detection area for detecting an edge of the coil in the image signal;
Calculating an overrun reference pixel position value according to a width of the coil in the edge detection area;
Detecting an edge of the coil in the edge detection area; And
And comparing the overrun reference pixel position value with a pixel position value of the detected edge to determine whether the coil box is overrun.
12. The method of claim 11, wherein after generating the image signal,
Further comprising the step of removing noise included in the image signal.
13. The method of claim 12,
The step of removing the noise includes:
And removing the noise included in the image signal using a Gaussian normal distribution.
11. The method of claim 10,
In the overrun prevention step,
Calculating a decelerated coil entry speed by applying a weight calculated by a width and a thickness of a coil to a reference coil entry speed in a coil entry speed calculation unit;
Controlling a coiling speed of the coil to compensate for a time delay due to a reduced coil entry speed; And
And adjusting a roll gap between a pair of upper bending rolls and a lower bending roll to control a traveling direction of the coil.
15. The method of claim 14,
Wherein the step of calculating the reduced coil entry speed comprises:
And calculating the decelerated coil entry speed using the following expression (2).
[Formula 2]
V ' _coil = α × V _coil (0.5 <α <1)
Where V _coil is the reference coil entry velocity, V ' _coil is the recalculated decelerated coil entry velocity, and α is the weight calculated by the width and thickness of the steel plate, m] (meters / minute).
15. The method of claim 14,
The step of compensating for the time delay comprises:
The method for overrunning a coil box according to any one of claims 1 to 5, wherein the coil delay time of the coil is controlled by controlling the coil winding speed of the coil in the coil speed compensating unit.
[Formula 3]
Y = V ₁ * T ₁ + V ₂ * T ₂ = reference speed (Vref) * reference time (Tref)
[Formula 4]

[Formula 5]

Where Y is the bar length, V ₁ is the reduced coiling speed, V ₂ is the increased coiling speed, T ₁ is the reduced coiling speed holding time, T ₂ is the increased coiling speed holding time, The unit of time is [mm] (millimeter), the unit of speed is [m / m] (meters / minute), and the unit of time is [sec] (seconds).
15. The method of claim 14,
Wherein the step of controlling the traveling direction of the coil comprises:
Calculating a roll gap between a pair of upper bending rolls and a lower bending roll in a bending roll gap calculating unit using the following formula 6 according to the width and thickness of the coil.
[Formula 6]

Here, the first bending roll gap (Roll_Gap _A ) is the gap between the first upper bending roll and the lower bending roll, the second bending roll gap (Roll_Gap _B ) is the gap between the second upper bending roll and the lower bending roll, Roll_Gap _ref means the reference gap. Then,

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Is a constant determined by the width and speed of the steel sheet.

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