KR100957927B1 - Apparatus for detecting front end of strip and strip winding apparatus having the same - Google Patents

Abstract

According to an embodiment of the present invention, at least one optical detection unit focuses and irradiates a plurality of laser beams to an irradiation point, which is a point on a pass line through which a strip passes, and detects an amount of light of the plurality of laser beams reflected from the strip. ; And converting the amount of light detected by the optical detector into an electrical signal and providing a signal as to whether or not the strip is present in the pass line from the converted electrical signal and a strip leading edge detection signal indicating that the leading edge of the strip is detected. It provides a strip front end detection device comprising a signal processor.

Strip tip detection device, winding device, QOC, laser sensor

Description

Strip tip detection device and strip winding device having the same {APPARATUS FOR DETECTING FRONT END OF STRIP AND STRIP WINDING APPARATUS HAVING THE SAME}

The present invention relates to a strip tip detection device and a winding device having the same, and more particularly, to a strip tip detection device including an optical detector and a signal processor to detect strip tip detection further, and a winding device having the same. It is about.

In general, the winding device is installed on the back of the high-speed traveling roller table (hereinafter referred to as a 'run out table (ROT)') of the steel sheet, so that the strip exiting the finishing mill is quickly transferred through the landing table. It is a device to wind the strip to be coiled immediately without stopping, and it is a cue to prevent strip winding shape defects such as the tip shot caused by the unit roll pressing the strip tip when winding up to the initial coil state of the strip and the telescope. QOC (QUICK OPEN CONTROL) control is performed. Here, QOC control means that the initial tip of the strip between the pinch roll and the unit roll is detected quickly and accurately.When the strip tip is close to each unit roll, the unit roll hydraulic servo drive is opened to open the unit roll with a predetermined jump amount and the tip is When it passes, it repeats the operation of pressing the set pressure again by the determined number of times.

In QOC control, the strip tip reference signal detection device for QOC control between the pinch roll and the unit roll eliminates the strip winding shape defects, such as the tip stamping and the telescope, generated during the initial winding of the strip during the hot rolling process. It is introduced for smooth winding of the strip, such as to prevent loosening. The QOC control strip tip reference signal detection device is directly connected to the tip quality and production of the strip, and requires a very high measurement accuracy and quick response.

On the other hand, in order to control the QOC of the mandrel and the unit roll during the initial winding of the strip tip, conventionally, a vibration sensor or a separate laser sensor in which the laser light receiver and the laser light emitter are separated. At times, the vibration sensor and the separate sensor operate to compensate for each other's shortcomings. That is, the vibration sensor has a small detection effect due to cooling water, dust, foreign matters, etc., but has a disadvantage in that accuracy and rapidity are inferior in detecting a wide band vibration, whereas the separate laser sensor has a small detection effect due to vibration in a wide band, , Dust, foreign matters, etc. have a disadvantage of inferior detection accuracy and rapidity. Although only one of them is detected, QOC control of the initial winding of the strip is possible, but such a conventional detector has the following problems.

First, the vibration sensor, which is a conventional QOC control tip tracking reference signal detection device, detects the presence or absence of an entry of a strip by using the above-described principle. Recognizing that the strip has entered, the QOC control is activated and the unit roll is operated to cause damage to the winding equipment. If the detection sensitivity is lowered, the vibration sensor prevents the entry of the strip when a thin strip with little vibration due to impact passes. Failure to detect and stopping the QOC control results in a winding malfunction that causes the strip tip not to be wound and a collision between the winding equipment and the strip occurs. This takes a long time to recover the winding malfunction for disposing of the winding malfunction coil, thereby causing a fatal problem that the production is stopped.

Secondly, the vibration sensor, which is a conventional QOC control tip tracking reference signal detecting device, detects a delay in tracking detection response to entry of a strip when the vibration of the strip passes through the pinch roll and is delayed even a little or late. Due to the delayed timing, the roll of the unit roll presses the leading edge of the strip at the time of winding, thereby causing a problem in that the winding shape of the strip is deteriorated, such as the tip is taken and the telescope is generated.

Thirdly, the split type laser sensor, which is a QOC control strip tracking reference signal detecting device of the conventional steel sheet, detects the presence or absence of the strip by using the above-described method, but the laser beam receiving unit installed under the pass line has poor environmental conditions (cooling water, water vapor, dust). Although the laser beam receiving unit is contaminated by the laser beam receiving unit and there is no strip, there is no laser beam receiving amount or the laser beam is received and the strip is recognized as having entered, the QOC control is activated and the unit roll is operated to cause damage to the winding equipment.

Fourth, as the laser receiver consists of semiconductor elements and electronic components, it often takes a lot of time and money to replace and maintain a separate laser sensor due to frequent failures of the sensor due to poor insulation, moisture penetration and disturbance. There was.

Fifth, when continuous operation of a large, wide strip with very high impact vibration occurs, the laser generator and the laser receiver of the detachable laser sensor are mechanically distorted, resulting in a change in the laser beam irradiation angle and the laser beam receiving position. In spite of the absence of the laser beam, the amount of laser beam received is low or low, which causes the strip to be recognized as having entered the strip, which activates the QOC control and activates the unit roll to damage the winding equipment.

Sixth, there is a problem that takes a lot of time and money to maintain the maintenance, such as replacement and mechanical adjustment of the laser generator and the laser receiver of the separate laser sensor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a strip shear detection device and a strip winding device having the same, which can accurately detect strip shear.

It is another object of the present invention to provide a winding apparatus capable of precisely controlling the QOC according to accurate strip detection from the strip shear detecting apparatus by having a strip shear detecting apparatus capable of accurately and quickly detecting strip shear. .

It is still another object of the present invention to provide a strip shear detection device which is easy to maintain and a strip winding device having the same.

In order to achieve the above object, one aspect of the present invention concentrates and irradiates a plurality of laser beams to an irradiation point, which is a point on a passline through which a strip proceeds, and detects an amount of light of the plurality of laser beams reflected from the strip. At least one optical detector; And converting the amount of light detected by the optical detector into an electrical signal and providing a signal as to whether or not the strip is present in the pass line from the converted electrical signal and a strip leading edge detection signal indicating that the leading edge of the strip is detected. It provides a strip front end detection device comprising a signal processor.

Each of the optical detectors may include: a plurality of laser light emitting units configured to irradiate a plurality of laser beams at an angle with respect to the irradiation point at a predetermined angle with the vertical direction of the irradiation point; And a laser light receiver configured to be installed in the vertical direction of the irradiation spot on the same side as the plurality of laser light emitters based on the strips, and to collect the plurality of laser beams reflected from the strips.

The plurality of laser light emitting units may be disposed symmetrically with respect to the vertical direction of the irradiation point, and in particular, all of the predetermined angles of the plurality of laser beams forming the vertical direction of the irradiation point are all the same. Do.

In addition, each of the laser light emitting unit, a laser diode for irradiating the laser beam; A laser diode housing in which the laser diode is fixedly mounted therein; And a laser beam irradiation angle adjusting means for adjusting a position of the laser diode housing to adjust an irradiation angle of the laser beam irradiated by the laser diode mounted on the laser diode housing. Preferably, the laser light emitting portion is made in one piece.

The laser light receiver comprises: a collecting lens collecting the plurality of laser beams reflected from the irradiation point; A straight lens for straightening the collected laser beam; A condenser lens for concentrating the straight laser beam; And a photo detector that detects an amount of light from the focused laser beam.

On the other hand, the signal processing unit, an optical / electrical converter for converting the amount of light detected by the optical detection unit into an electrical signal; An amplifier for amplifying the electrical signal; A filter unit to remove low frequency noise and high frequency noise from the electrical signal amplified by the amplifier; A signal attenuation compensator for compensating the electrical signal passing through the filter unit; And a comparator comparing the compensated electrical signal with a preset reference signal.

At least one optical detection unit may be included, and at least one optical detection unit may be installed at each of the inlet side and the outlet side of the roll into which the strip is inserted.

The signal processor may be configured to determine whether or not the strip exists in the pass line by using the amount of light detected by each of the at least one optical detector and the detected time of the at least one optical detector. Signal and a tip detection signal of the strip can be provided.

Another aspect of the invention, a mandrel; A plurality of unit rolls for applying pressure to the strips so as to wind the strips on the mandrel; A plurality of round guides for guiding the unit roll so that the unit roll exerts pressure on the strip, and guiding the strip such that the strip wound by the pressure of the unit roll has a predetermined curvature; And a control unit controlling the round roll to adjust the pressure applied by the unit roll to the plurality of unit rolls. A strip winding apparatus comprising: the strip tip tracking reference signal detecting apparatus further described above, wherein the controller controls a strip winding apparatus for controlling the pressure applied by the unit roll according to the strip detecting signal from the signal processing unit. to provide.

According to an embodiment of the present invention, first, even if mechanical distortion caused by shock and vibration occurs, the absolute position does not change at the irradiated laser beam position and the laser beam receiving position, so that accurate detection is possible. As it is not affected by foreign matters, accurate and rapid detection is possible. Third, the compact structure of all the functions of the device makes it possible to minimize the constraints on the installation space. It does not require any maintenance such as mechanical adjustment or cleaning of the sensor, and it can be used semi-permanently until the lifetime of the detector is reached. Fifth, the time required for inspecting and replacing the detector is extremely small and practical, and there is an advantage of not requiring additional adjustment before replacing the detector with an optical sensing unit adjustment and setting once in the initial installation.

In addition, the strip winding apparatus according to the embodiment of the present invention has the effect of minimizing the strip winding failure by winding the strip more precisely by having such a strip shear detection device.

Hereinafter, with reference to the accompanying drawings, a strip front end detection device and a strip winding device having the same according to an embodiment of the present invention will be described. The same or similar reference numerals in different drawings represent the same or similar components.

1 is a schematic block diagram of a strip tip detection apparatus 200 according to an embodiment of the present invention. In particular, FIG. 1A shows a block diagram of the strip tip detection apparatus 200 when the strip 10 is detected, and FIG. 1B shows the strip when the strip 10 is not detected. The block diagram of the front end detection apparatus 200 is shown.

As shown in (a) and (b) of FIG. 1, the strip tip detecting apparatus 200 according to the embodiment of the present invention, the irradiation point (A) which is a point on the pass line through which the strip 10 proceeds. At least one optical detector 210 and an optical signal detected by the optical detector 210 to detect the amount of light of the plurality of laser beams reflected from the strip 10 as an electrical signal. And a signal processor 220 to convert and process the processed signal.

The optical detector 210 of the strip shear detection apparatus 200 irradiates a laser beam to an irradiation point A, which is a point in a pass line of the strip 10. At this time, when there is a strip 10 at the irradiation point A as shown in FIG. 1A, the laser beam irradiated to the irradiation point A is reflected back to the optical detection unit 210 by the strip A. FIG. If so, the optical detector 210 detects an amount of light of the reflected laser beam and provides it to the signal processor 220. The signal processor 220 provides a signal indicating that there is a strip 10 in the pass line based on the amount of light received.

On the other hand, when there is no strip 10 at the irradiation point (A) as shown in Figure 1 (b), the laser beam irradiated to the irradiation point (A) passes through the irradiation point (A) as it is, the laser beam is an optical detection unit It is not reflected to 210. Accordingly, since the amount of light that can be detected by the optical detector 210 is very low or is very weak due to noise caused by external light, the signal processor 220 provides a light amount close to zero. The signal processor 220 provides a signal that there is no strip 10 in the pass line based on the amount of light provided.

As such, the signal processor 220 may provide a signal as to whether the strip 10 is present in the pass line based on the amount of light provided from the optical detector 210.

On the other hand, the signal processing unit 220 may further provide a strip shear detection signal that the front end of the strip (A) has been detected by detecting that the strip 10 does not exist or exists, instead, In addition, the signal processor 220 may provide only information regarding the presence or absence of the strip A, and may generate a strip tip detection signal in a device (not shown) provided with the information.

Next, the optical detector 210 will be described with reference to FIG. 2.

2 is a schematic block diagram of an optical detector 210 according to an embodiment of the present invention. As shown in FIG. 2, the optical detection unit 210 includes a plurality of laser light emitting units 211 that irradiate a plurality of laser beams formed at a predetermined angle with the vertical direction of the irradiation point A with respect to the irradiation point A. The laser light receiving unit 215 installed in the vertical direction of the irradiation point A on the same side as the plurality of laser light emitting units 211 with respect to the strip 10 and collecting the plurality of laser beams reflected from the strip 10. It includes. In particular, the laser receiver 215 includes a collecting lens 216 for collecting a plurality of laser beams reflected at the irradiation point A, a straight lens 217 for straightening the collected laser beam, and a straight laser beam. A condenser lens 218 for concentrating at 219 and a light detector 219 for detecting the amount of light from the focused laser beam.

The optical detector 210 simultaneously irradiates a laser beam from the plurality of laser light emitters 211 to the irradiation point A on the pass line of the strip 10 and reflects the plurality of laser beams from the strip 10. In this case, the reflected laser beam is concentrated on the photodetector 219 while sequentially passing through the light receiving lens 216, the straight lens 217, and the condensing lens 218, and the light detector detects the amount of light reflected therefrom. Output

Although the laser emitter 211 is illustrated as two in the drawing, this is illustrative and three or more laser emitters 211 may be used.

On the other hand, the surface of the strip 10 is not as smooth as a mirror due to the characteristics of the strip, in most cases is a little rough. Therefore, when diffused reflection occurs due to the rough surface of the strip 10 when one beam is irradiated to the strip 10, the strip 10 is in the pass line because the amount of the laser beam gathered in the laser receiver is insufficient. Nevertheless, it can be determined that there is no strip 10. In order to prevent this, a plurality of laser light emitting units 211 are used.

In addition, the laser light emitting unit 211 is disposed so that the laser light emitting unit 211 forms a constant angle with the vertical direction of the irradiation point (A) relative to the strip 10, the laser light receiving unit 212 is a laser light emitting unit 211. By placing the laser light receiving portion 215 on the same side as in the vertical direction of the irradiation point A, the laser beam reflected from the strip 10 is directed to the laser light receiving portion 215 stably so that even if diffuse reflection occurs (10) It is possible to more accurately detect the tip.

Next, the arrangement of the laser light emitting portion 211 with respect to the irradiation point will be described with reference to FIGS. 3A and 3B. 3A and 3B schematically illustrate the arrangement of the laser light emitting portion 211 as viewed from the top of the strip 10 according to one embodiment of the invention. In particular, FIG. 3A shows the arrangement of four laser emitters 211, and FIG. 3B shows the arrangement of three laser emitters 211.

As shown in Figs. 3A and 3B, the respective laser light emitting portions 211 are arranged symmetrically with respect to the vertical direction of the irradiation point A (in the drawing, the direction entering the irradiation point A). By this arrangement, the plurality of laser beams irradiated from each of the laser light emitting units 211 may have the same angle as the vertical direction of the irradiation point A. Therefore, by this arrangement, the laser beam diffusely reflected at the irradiation point A of the strip 10 can be more reliably detected by the laser light receiving portion 212. That is, when diffuse reflection occurs at the irradiation point A, a plurality of symmetric laser beams are irradiated to the same point A from the plurality of symmetrically arranged laser emitters 211, and the diffuse reflection at the irradiation point A is performed. The laser beams are reflected at different angles. Especially. The diffuse reflection due to the arrangement of FIGS. 3A and 3B may have reflection angles opposite to each other. Therefore, the probability that the laser beam reflected by the strip 10 reaches the laser receiver 212 by the arrangement as shown in FIGS. 3A and 3B becomes very high, thereby greatly increasing the reliability of detecting the strip 10. .

Meanwhile, instead of the arrangement as shown in FIGS. 3A and 3B, the angles of the plurality of laser beams each forming the vertical direction of the irradiation point A may be the same, and in this case, similar effects to those of the arrangement of FIGS. 3A and 3B may be achieved. Can be obtained. 3A and 3B illustrate four and three laser emitters 211, respectively, the present invention is not limited thereto, and a greater number of laser emitters or fewer laser emitters may be included. .

Meanwhile, an embodiment of the laser light emitter 211 is shown in FIG. 4. 4 is a block diagram of an example of a laser light emitting unit 211 that can be used in the strip tip detection apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the laser light emitting unit 211 includes a laser diode 212 for irradiating a laser beam, a laser diode housing 213 on which the laser diode 212 is fixed and mounted, and a laser diode housing 212. It may be configured to include a laser beam irradiation angle adjusting means 214 to adjust the irradiation angle of the laser beam irradiated by the laser diode 212 mounted on the laser diode housing 213 by adjusting the position of the).

In FIG. 4, the laser beam irradiation angle adjusting means 214 includes a mounting member 214a and a plurality of position adjusting bolts 214b, and the mounting member 214a and the laser diode according to the degree of tightening the position adjusting bolts 214b. The angle formed by the housing 213 is changed, and thus the irradiation angle may be varied so that the laser beam irradiated by the laser diode 212 mounted on the laser diode housing 213 is directed toward the irradiation point A. FIG.

The laser light emitting unit 211 may be integrally formed, and through this configuration, the laser light emitting unit 211 may easily adjust the irradiation angle of the laser beam. That is, not only when the laser light emitting unit 211 is installed, but also when the irradiation angle of the laser beam is shifted due to mechanical vibration or the like depending on the working conditions, the laser irradiation angle can be easily adjusted. In addition, since the laser light emitting unit 211 breaks down, it is easy to replace the broken parts, thereby reducing the time and cost of maintenance.

Next, the signal processing unit 220 of the strip tip detection apparatus 200 according to the embodiment of the present invention will be described with reference to FIG. 5.

5 is a block diagram of the signal processor 220 of the strip tip detection apparatus 200 according to an embodiment of the present invention.

As shown in FIG. 5, the signal processor 220 includes an optical / electric converter 221 for converting the amount of light detected by the optical detector 210 into an electrical signal, an amplifier 222 for amplifying the electric signal with respect to the amount of light, A filter unit 223 for removing low frequency and high frequency noise from the amplified electric signal in the amplifier, a signal attenuation compensator 224 for compensating the electric signal passing through the filter unit, and a comparator for comparing the compensated electric signal with a preset reference signal 225.

The signal processor 220 detects the signal detected by the optical detector while passing the signal detected by the optical detector 210 through the optical / electric converter 221, the amplifier 222, the filter unit 223, and the signal attenuation compensator 224. After the amount of light is converted into an electric signal, unnecessary noise components are removed to become an electric signal having a magnitude (a magnitude of voltage or current) within a predetermined range, and the electric signal is a comparator 225 to determine whether the strip 10 is detected. ) Is compared with the reference signal preset.

For example, the signal input to the comparator 225 is a voltage signal having a magnitude of 0 to 5V, and if the preset reference signal is set to a voltage signal of 2.5V, the signal input to the comparator 225 is a reference signal. If it is smaller, the comparator 225 outputs a signal indicating that the strip 10 is not in the pass line because a sufficient amount of light has not been detected by the laser receiver 215, and the signal input to the comparator 225 is referred to. If it is larger than the signal, a sufficient amount of light has been detected by the laser receiver 215, and the comparator 225 outputs a signal indicating that the strip 10 is in the pass line.

Through the signal processing of the signal processor 220, it is possible to quickly and accurately detect whether the strip 10 is present and whether the front end of the strip 10 is detected.

Meanwhile, although the optical / electric converter 221 is illustrated as being included in the signal processor, the optical / electric converter 221 is included in the laser receiver 215 so that the laser receiver 215 may be applied to the laser beam. The amount of light may be detected and converted into an electrical signal and then provided to the signal processor 220.

Next, a strip tip detection apparatus according to another embodiment of the present invention will be described with reference to FIG. 6.

6 is a schematic block diagram of the strip tip detection apparatus 300 according to another embodiment of the present invention.

As shown in FIG. 6, the strip tip detection device 300 is similar to the strip detection device 200 shown in FIG. 1, but has an inlet side and an outlet side through which the strip 10 of the pinch roll 20 is blown. Are different in that the optical detection units 310 are respectively provided.

As such, the optical detection unit 310 is installed at the inlet side and the outlet side through which the optical detector 310 is inserted, so that the presence of the strip 10 and the front end detection of the strip 10 can be detected more quickly and accurately. Can be.

On the other hand, in this case, the signal processor 320 uses the amount of light detected by the entrance optical detector and the exit optical detector of the two optical detectors 320 and the time when they are respectively detected. It is possible to provide a signal as to whether or not there is and a leading detection signal of the strip 10.

In addition, in the drawing, it is shown that the optical detection unit has one inlet side and an outlet side optical detector, respectively, of the strip, but the present invention is not limited thereto and includes two or more optical detectors at the inlet side and the outlet side, respectively. Configuration is also possible.

On the other hand, according to an embodiment of the present invention, there is provided a strip winding device 400 having the above-described strip tip detection device (200, 300). A strip winding apparatus 400 according to an embodiment of the present invention will be described with reference to FIG. 7.

7 is a schematic block diagram of a strip winding apparatus 400 according to an embodiment of the present invention.

As shown in FIG. 7, the strip winding device 400 according to an embodiment of the present invention concentrates a plurality of laser beams at an irradiation point A, which is a point on a pass line through which the strip 10 proceeds. At least one optical detector 210 that detects the amount of light of the plurality of laser beams reflected from the strip 10, and a signal processor that converts the amount of light detected by the optical detector 210 into an electrical signal and processes the same; 220, a mandrel 440 on which the strip is wound, a plurality of unit rolls 421, 422, 423, 424 which pressurize the strip 10 so that the strip 10 is wound on the mandrel 440, and a unit roll 421. , 422, 423, 424 guide the unit rolls 421, 422, 423, 424 to pressurize the strip 10, and strips wound by the pressure of the unit rolls 421, 422, 423, 424 A plurality of round guides 431, 432, 433, 434 guiding the strip 10 so that the 10 has a predetermined curvature; And a controller 450 for controlling the round guides 431, 432, 433, and 434 to adjust the pressure applied by the unit rolls 421, 422, 423, and 424 to the strip 10, and the controller 450. ) Controls the pressure at which the unit rolls 421, 422, 423, 424 apply the strip 10 according to the strip detection signal from the signal processor 220.

1 and 7, it can be seen that all the configurations of the strip winding apparatus 200 illustrated in FIG. 1 are included in the strip winding apparatus 400 of FIG. 7. However, this is exemplary, and instead of the strip winding apparatus 200, not only the strip winding apparatus 200 shown in FIG. 5 but also the above-described strip winding apparatus may be included.

When the strip winding device 400 receives the strip detection signal from the strip winding device 200 in the control unit 450, the control unit 450 may determine the distance between the irradiation point A and the mandrel 440 and the strip 10. Based on the speed at which the strip 10 is blown accurately, the unit rolls 421, 422, 423, 424 press the strip 10 for a period of time and then jump (ie not press) QOC control is performed to control the round guides 431, 432, 433, and 434 to repeat the operation. This QOC control is repeated until the strip is wound about 6 to 10 times depending on the type of strip.

As such, the strip wound on the strip winding device allows the strip to be accurately inserted into the winding device without damaging the winding device because the strip detection device provides an accurate strip detection signal, There is an advantage that can prevent the occurrence of the scope.

8A and 8B show the wound state of the strip wound in the strip winding apparatus according to this embodiment of the present invention and the wound state of the strip wound in the conventional strip winding apparatus, respectively.

In the strip wound in the strip winding apparatus according to the prior art, as shown in FIG. 8A, a loop is generated due to a failure in detecting the front end of the strip, but a telescope is formed, but in the strip wound in the strip winding apparatus according to the present invention, FIG. 8B. Telescope does not occur as shown in FIG. The wound state of this strip is improved compared to the prior art, which significantly reduces coil failure.

In the above, the strip front end detection apparatus and strip winding apparatus provided with the same which demonstrated the Example of this invention were demonstrated. It will be apparent to those skilled in the art that the above-described strip tip detection device can be used not only for the strip winding device but also for any device requiring tip detection of the strip. Therefore, the strip tip detection apparatus of the present invention is not limited to providing strip tip detection signals for the strip winding apparatus.

The present invention is not limited by the above-described embodiments and the accompanying drawings, but by the appended claims. Therefore, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible without departing from the technical spirit of the present invention described in the claims, and the appended claims. Will belong to the technical spirit described in.

1 is a schematic block diagram of a strip tip detection apparatus according to an embodiment of the present invention.

2 is a schematic block diagram of an optical detector according to an embodiment of the present invention.

3A and 3B are schematic views showing the arrangement of the laser light emitting part seen from the top of the strip according to the embodiment of the present invention.

4 is an exploded perspective view of an example of a laser light emitting unit that may be used in the strip tip detection apparatus according to an embodiment of the present invention.

5 is a block diagram of a signal processor that may be used in the strip tip detection apparatus according to an embodiment of the present invention.

6 is a schematic block diagram of a strip tip detection apparatus according to another embodiment of the present invention.

7 is a schematic block diagram of a strip winding apparatus according to an embodiment of the present invention.

8A and 8B show a wound state of a strip wound in a strip winding apparatus according to an embodiment of the present invention and a wound state of a strip wound in a conventional strip winding apparatus, respectively.

<Explanation of symbols for the main parts of the drawings>

10: strip 20: pinch roll

200, 300: strip end detection device 400: strip winding device

210 and 310: optical detector 211: laser light emitter

212: laser diode 213: laser diode housing

214: laser beam irradiation angle adjusting means 215: laser receiving unit

216: collecting lens 217: straight lens

218: condenser lens 219: photo detector

220, 320: signal processor 221: optical / electric converter

222: amplifier 223: filter unit

224: signal attenuation compensator 225: comparator

421, 422, 423, 424: Unit rolls 431, 432, 433, 434: Round guide

440: mandrel 450: control unit

Claims (11)

At least one optical detection unit for concentrating and irradiating a plurality of laser beams at an irradiation point, which is a point on a pass line through which the strip proceeds, and detecting an amount of light of the plurality of laser beams reflected from the strip; And A signal for converting the amount of light detected by the optical detector into an electrical signal and providing a signal for whether the strip exists in the pass line from the converted electrical signal and a strip leading detection signal indicating that the leading edge of the strip is detected Processing unit; Including; Each of the optical detection unit, A plurality of laser light emitting units configured to irradiate a plurality of laser beams at a predetermined angle with respect to the irradiation point in a vertical direction of the irradiation point; And A laser light receiver configured to be installed in the vertical direction of the irradiation point on the same side as the plurality of laser light emitters based on the strips, and to collect the plurality of laser beams reflected from the strips; Strip front end detection device comprising a. delete The method of claim 1, And the plurality of laser light emitting units are arranged symmetrically with respect to each other based on the vertical direction of the irradiation point. The method of claim 1, And a predetermined angle formed by each of the plurality of laser beams in the vertical direction of the irradiation point is the same. The method of claim 1, Each of the laser light emitting unit, A laser diode for irradiating the laser beam; A laser diode housing in which the laser diode is fixedly mounted therein; And Laser beam irradiation angle adjusting means for adjusting a position of the laser diode housing to adjust an irradiation angle of the laser beam irradiated by the laser diode mounted on the laser diode housing; Strip front end detection device comprising a. The method of claim 3, And the laser light emitting unit is formed in one piece. The method of claim 1, The laser light receiver, A collecting lens for collecting the plurality of laser beams reflected at the irradiation point; A straight lens for straightening the collected laser beam; A condenser lens for concentrating the straight laser beam; And A photo detector for detecting a light amount from the focused laser beam; Strip front end detection device comprising a. The method of claim 1, The signal processing unit, An optical / electric converter for converting the amount of light detected by the optical detector into an electrical signal; An amplifier for amplifying the electrical signal; A filter unit to remove low frequency noise and high frequency noise from the electrical signal amplified by the amplifier; A signal attenuation compensator for compensating the electrical signal passing through the filter unit; And A comparator for comparing the compensated electrical signal with a preset reference signal; Strip front end detection device comprising a. The method of claim 1, At least one optical detection unit is included, And at least one optical detecting unit is provided at each of the inlet side and the outlet side of the roll into which the strip is inserted. 10. The method of claim 9, The signal processor may include a signal indicating whether or not the strip exists in the pass line by using the amount of light detected by the entrance optical detector and the exit optical detector of the at least one optical detector, and the detected time of the light quantities, respectively; And providing a tip detection signal of the strip. Mandrel; A plurality of unit rolls for applying pressure to the strips so as to wind the strips on the mandrel; A plurality of round guides for guiding the unit roll so that the unit roll exerts pressure on the strip, and guiding the strip such that the strip wound by the pressure of the unit roll has a curvature; And A control unit for controlling the round roll to adjust the pressure applied by the unit roll to the plurality of unit rolls; In the strip winding apparatus comprising: 10. The apparatus of claim 1, further comprising a strip leading tracking reference signal detecting device according to claim 1. And the controller controls the pressure applied by the unit roll in response to the strip detection signal from the signal processor.

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