KR20030055572A - Apparatus for detecting the defect portion in the surface of the strip - Google Patents

Abstract

PURPOSE: A detecting apparatus for surface defect of a strip is provided to find surface detect promptly of the constant proceeding strip to prevent deterioration of the strip. CONSTITUTION: A detecting apparatus for surface defect of a strip comprises a light emitting device(105), a camera(50) and a rotating roller(10). The light emitting device irradiates light on a surface of the strip. The camera senses light reflected from the strip after irradiating light on a lower end of the light emitting device. The rotating roller measures a site of surface defect when uneven surface defect is sensed by the camera. Measured value of the roller is transmitted to a central controller to meet surface defect. Therefore, the defect generating site is removed in short time by sensing a defect generating distance and calculating an external diameter of the rotating roller.

Description

Apparatus for detecting the defect portion in the surface of the strip}

The present invention relates to an apparatus for detecting a surface defect of a strip for identifying a defect of a continuous surface of the strip and calculating a position thereof, and more particularly to an uneven defect portion occurring at regular intervals at a high speed of the strip surface. The present invention relates to an apparatus for detecting a surface defect of a strip for detecting and minimizing a defect by transmitting and receiving a defect occurrence point and a rotation roll value to a central controller.

In general, the strip surface, which proceeds to the reprocessing of the hot rolled strip in the continuous line of the cold rolling process, is reprocessed to suit each process through several processes. After that, it is coated with a chromium solution for galvanizing and improving corrosion resistance. Strips produced in this manner are widely used for various electronic products and automotive strips.

As described above, when the plated strip is shape-corrected in the reprocessing operation of the cold rolling process, if foreign matter is mixed on the surface of the rolling roll, a roll marking mark is generated on the surface of the strip. These roll mark marks act as fatal defects on the strip surface.

In order to reduce defects of the roll mark, as shown in FIG. 1, the operator can visually check the high speed of the strip 1 entering the inspection table 3 through the rotary roll 2. After deceleration, inspect the surface for defects on the strip. If these defects are detected at regular intervals, the continuous line is temporarily stopped. Then, the operator measures the interval at which the surface defects are generated using a tape measure (not shown), restarts the continuous line, and notifies the central operator of the measured defect interval data by wire. The central operator directs corrective actions corresponding to the data of the fault intervals transmitted.

That is, the surface defect inspection method of the conventional strip is made as follows.

Continuous line high speed operation, continuous line deceleration operation, visual inspection of the surface defects of the strips, continuous line pause, measurement of the gap of defect area, restart of the continuous line, wire notification of defects and interval data, and on-site inspection of the central operator. Inspect the surface defects of the strips in the order of tracking the occurrence and taking measures for defects.

At this time, in order to deal with the defect occurrence area, the central operator arbitrarily selects a roll close to the defect occurrence interval from various kinds of rotating rolls mounted on the continuous line and performs the roll surface cleaning operation.

However, since the rotary rolls mounted on the continuous line have a generally similar outer diameter, it is difficult to find a defect occurrence area in a short time based on the defect details and the interval data as described above.

As a result, surface defects of strips that occur once are continuously generated unless the underlying causes are eliminated, thereby degrading the quality of the strips.

The present invention has been made to solve the conventional problems as described above, the surface of the strip that can detect the surface defects of the continuous strip in order to prevent the degradation of the strip and can quickly find the location thereof Its purpose is to provide a defect detection apparatus.

1 is a view showing a state in which a strip passes through an inspection table for inspecting a defective portion of the strip surface;

Figure 2 shows a detection device for detecting a defect site of the strip surface in accordance with the present invention;

3 is a view showing a detection unit of the surface defect detection apparatus of the strip according to the present invention;

4 is a view showing an injection unit of the surface defect detection apparatus of the strip according to the present invention;

5 is an exploded perspective view showing a detection unit of the surface defect detection apparatus of the strip according to the present invention;

Figure 6 is an exploded perspective view showing the injection of the surface defect detection apparatus of the strip according to the present invention;

<Description of Symbols for Major Parts of Drawings>

10: measuring roller

13, 73: moving table

14 brake body

16: semicircular brake

50: camera

52: circular rotating plate

70: injection nozzle

106: swivel

In order to achieve the above object, according to the present invention, there is provided an apparatus for detecting surface defects of a traveling strip and a light emitter for scanning the light on the surface of the strip, and located at the bottom of the light emitter, A camera for detecting the light reflected from the strip, and when the uneven surface defect is detected by the camera characterized in that consisting of a rotating roller for measuring the occurrence of the surface defect.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention, the same configuration will be assigned the same reference numerals.

According to the present invention, an apparatus for detecting surface defects of a strip includes a length interval measuring unit capable of precisely measuring the length interval of defects generated on the surface of the strip, a camera recognition unit recognizing the defect portion, and a surface of the advancing strip. It consists of a light emitting unit for illuminating. And, in the case of a coating product, the coating part for surface inspection further includes.

The light emitting unit has an illumination light emitting unit 105 that transmits bright light at all times to the surface of the strip that proceeds during the operation of the continuous line. In this case, a camera 50 for detecting surface defects is provided at the lower end of the illuminator 105. The camera 50 always detects the side end portion of the strip S traveling on the stationary position, and the light deviation, that is, the light deviation caused by the slightly black portion when the unevenness defect occurs, is plural at regular intervals. If it is detected continuously, for example 2 ~ 3 times, it is recognized as a defective part.

As described above, when the defect occurrence site is recognized by the camera 50, the strip S progressing at a high speed is slowly decelerated at a slow speed, and the camera 50 at the stop position is transferred to the defect occurrence site. The roller 10 is in contact with the strip surface to accurately measure the length and position of the defect occurrence site.

Then, the measurement value is transmitted to the controller (not shown), the controller automatically calculates the transmitted measurement value to transmit and receive the correct defect occurrence site and the rotation roll value so that quick follow-up actions can be made.

That is, in order to accurately measure the length spacing of defects generated on the surface of the strip, both axes of the measuring roller 10 are mounted on the bearing block 11, respectively, and the end of the movable table 13 is fixed by using a fixing bolt. To be fixed. At this time, a pair of distance calculator 12 is mounted on one side of the bearing block (11).

The semicircular brake 16 is mounted on the brake body 14 on one side of the upper end of the measuring roller 10, and the square brake liner 17 is fixedly mounted on the other side of the measuring roller 10. Semi-circular brake 16 is fixed to the shaft of the electric motor (15) mounted on its top.

The moving table 13 is firmly fixed to the side end of the circular female screw member 25 by welding, and the female screw member 25 is mounted to the screw thread 24. At the rear end of the screw thread 24, the rod of the cylinder 32 is connected to the movable table 13 so as to be able to move back and forth long. The screw thread 24 is mounted to a bearing block 20 mounted on each of both sides of the thread. The bearing block 20 is fixed on the square fixing plate 21, and a driving electric motor 22 is fixed to the pedestal 23 on one side of the screw thread 24 to be fixed to the shaft of the screw thread 24. The calculator 26 is mounted at the rear end thereof. The fixed plate 21 is firmly mounted to the main body 40 provided at its lower end.

The camera recognition unit for recognizing defects is mounted on the screw thread 24. It has an array of gear mounts and a camera 50 mounted on a circular rotary plate 52 on which touch bars 53 and 54 and a pedestal 51 are mounted. The circular rotating plate 52 is mounted on a square support plate 58 having a circular bearing 57 at the bottom thereof.

On the square support plate 58 is provided a circular gear 59 on which each sensor 55 is mounted and which meshes with the side ends of the circular rotary plate 52 on which the gear mounts are arranged. At the lower end of the circular gear 59, a driving electric motor 60 is mounted. At the bottom of the square support plate 58 is mounted a square support plate 62 coupled to the vertical rods 61 provided at each of the square points. A circular female screw member 31 and a circular guide 25 are provided at the lower end of the square support plate 62.

In order to provide bright lighting conditions during operation on top of the mounted camera detector, the light emitters 105 are mounted on the rotating tables on both sides. It is rotatably mounted on the vertical body. Thereafter, a rotary electric motor equipped with a calculator is mounted on the upper end of the vertical body, and the circular gear 103 is mounted on each of the shafts of the electric motor 103 and the swivel table 106 so as to be engaged with each other.

On the other hand, the coating portion is mounted to the injection nozzle 70 in the circular header 71, and is mounted on the movable base 73 by using a fixed table (72). The cylinder 78 is mounted on the fixing unit 72 such that the cylinder 78 can be moved back and forth on the square rail 74 mounted on the vertical body 91.

Then, the lower end of the vertical body 91 is mounted with a circular female screw member 93 and a circular guide 98 so as to be movable left and right, respectively. Each of them is equipped with a thread 94 and a guide rod 99. Both sides of the thread 94 are rotatably supported by the bearing block 95.

One end of the thread 94 is mounted with an electric motor 96 equipped with a calculator. Guide rods 99 are mounted by welding on the left and right sides of the vertical body (90).

A fixing plate 92 is mounted on an upper end of the vertical body 91, and a circular tank 84, which is a coating liquid reservoir, is mounted thereon. An automatic valve 77 is mounted on the supply pipe connected to the injection nozzle 70. A bellows-type flexible hose 75 is mounted between the supply pipe 78 and the circular header 71 for smooth operation. The upper end of the circular tank (84) is provided with a flexible hose (75) at the center of the air supply pipe 81, the supply pipe 81 is provided with an automatic valve (83).

Hereinafter, the operation of the surface defect detection apparatus of the strip according to the present invention will be described.

That is, the light reflected by the light emitter 105 using a constant light on the surface of the strip traveling at a high speed scans bright illumination light and is detected by the camera 50. At this time, the camera 50 detects the light reflected from the center point of the advancing strip. The electric motor 86 and the electric motor 76 operate finely in correspondence with the angle arbitrarily lowered on the inspection controller so that the proper angle adjustment and the illuminance value of the illumination can be maintained above the setting criteria.

When the values obtained by the inspection controller coincide with each other, the angle calculator 101 automatically stops the operation of the electric motor 102 to complete the angle adjustment operation. After the angle of the light emitting portion is adjusted in this way, the camera always monitors the center point of the strip surface as a reference.

At this time, the surface of the strip is brightly recognized by the camera while the camera 50 monitors the center of the strip. If irregularities are generated at regular intervals, the principle of temporarily darkening the portion is utilized. When the camera 50 monitors the strip surface that proceeds in this manner, and there are two or three dark illumination deviations at a predetermined interval on the strip surface, it recognizes that the portion is an uneven defect occurrence region. .

The inspection controller classifies the use of the strip in progress to determine whether it is an exterior product of a household appliance or a paint product.

On the other hand, if it is recognized as an uneven defect as described above, the speed of the continuous line that automatically rotates at high speed is decelerated.

In addition, the measurement principle clearly detects a point where a defect occurs in the focus of the camera 50, and automatically moves the electric motor 220 to a coupling occurrence position so that darkness is possible. The position is automatically sent to the inspection controller by camera measurements.

Afterwards, the line runs slowly until the defects on the strip surface are redetected two or three times at the focal point of the camera 50. The line stops automatically when a defect is detected in the camera focus. Then, the air cylinder 32 is advanced to move the movable base 130 mounted on the square rail 18 to the strip side, the measuring roller is automatically in close contact with the strip surface automatically.

At this time, in order to measure the exact length and minimize the measurement error range, the measuring roller 10 supports the side of the measuring roller on which the gear mount is processed on the semi-circular brake 16 when it is completely in contact with the strip surface. 15), the gear mount part is rotated to the opposite side of the measuring roller, and the measurement preparation is completed. In addition, when the line is operated in a slow motion, if a defective part is repeatedly detected with a constant pitch continuously in the focal part of the camera 50, the value is transmitted to the inspection controller and the result is waited for.

If the strip is an exterior material of home appliances, only the pitch defects occurring on the surface of the strip are measured and the result is calculated. In the case of the coating material, the coating test on the surface of the strip is performed secondarily after the measurement is completed. .

This is because the electric motor 96 is operated after the line proceeds slowly, and the female thread member 93 mounted on the thread 94 and the guide rod 99 and the vertical body 91 on the circular guide 98 are defective points. And stops, the air cylinder 78 is operated so that the jetting nozzle 70 on the movable base 73 mounted on the rail 74 is advanced to the strip surface.

When the automatic valve 83 is properly opened through the air supply pipe 81 and the flexible hose 82, the paint stored in the circular tank 84 starts painting coating on the surface of the strip through the injection nozzle 70.

In this way, the surface on which the strip is painted is measured in the manner described above.

As a result of the measurement, it is determined that the irregularities are defective. Secondly, the surface defect inspection work is carried out in the same manner as described above, and the defect that the pitch is not constant and the occurrence area is instantaneous, but the shape is long, but the pitch is difficult to be detected is detected only by the camera. In the controller, it is determined that slip is established.

At this time, the air cylinder 32 is opened and at the same time the moving table equipped with the measuring roller is spaced apart from the strip. Then, the electric motor automatically closes the semi-circular brake to the measuring roller 10 and positions the device on which the measuring roller 10 is mounted by the electric motor 22 at the stop position. The line starts high speed again.

The camera for measuring the defective portion may be positioned so that the detection of the touch bar 53 on the circular rotating plate 52 is detected by the electric motor 60 and the circular gear 59 when necessary. When the defect is measured, the initial focusing point at the camera focus is automatically recognized when the next focusing part is recognized and the zero point set is automatically made by the distance calculator 12 mounted at the measuring roller 10 side. The rotation roll value is indicated by the result value which is carried out 2-3 times by the method.

In addition, the camera 50 measuring the defective part is returned to the stop position while the electric motor 66 is operated, and when it returns, the touch bar on the circular rotating plate 52 is driven by the electric motor 60 and the circular gear 59. Position the detector at 53;

As described above, the measurement of the defect site generated on the strip surface is completed, and the measured data value is automatically calculated by the length controller measured by the measuring roller 10 in the inspection controller 90 (roll outer diameter value calculation formula: Occurrence length ÷ 3.14) It transmits the value of the generated point and the roll circumference value to the central controller 100 in the inspection controller as much as the value and the distance that the measuring roller 10 and the camera 50 were operated at the stop position. .

Then, the most effective way to cope with the occurrence of defects sent out on the central controller 100 and the above-described device is to continue to repeat the operation during the operation.

Therefore, according to the present invention, in order to solve the problems caused by the conventional method of inefficiently measuring defects generated at regular intervals generated on the strip surface during the operation of rotating at high speed due to the characteristics of the continuous line. Recognizes the distance of defect occurrence, calculates the exact value of the outer diameter of the rolling roll and transmits the exact point of the generated rolling roll from the inspection controller to the central controller, eliminating the defect occurrence area in the shortest time. The practical effect is to solve the problem.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains recognize that modifications and variations can be made to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. shall.

Claims (4)

In the device for detecting the surface defect of the advancing strip, A light emitter for injecting light onto the surface of the strip; A camera positioned at a lower end of the light emitter and detecting light reflected from the strip after being scanned from the light emitter; Surface defect detection device of the strip, characterized in that consisting of a rotating roller for measuring the occurrence of the surface defects when the uneven surface defect is detected by the camera. The method of claim 1, And the camera is movable in the width direction of the strip. The method of claim 1, And a reciprocating means for reciprocating the measuring roller in a direction toward the steel sheet. The method of claim 1, A spraying means provided above the illuminator and spraying paint toward the steel sheet, wherein the spraying means comprises a storage tank for storing the paint and a spray nozzle for spraying paint supplied from the storage tank; Surface defect detection device of the strip, characterized in that.