JP2020153913A - Method and device for recognizing edge of laminate metal band - Google Patents

Abstract

To provide a method and a device which is capable of recognizing an edge of a laminate metal band precisely regardless of whether a film is protruding from the laminate metal band.SOLUTION: A light receiver is set on one of the front surface side and the back surface side of a laminate metal band. On the side opposite to the side of the laminate metal band where the light receiver is set, a background light source located on the optical axis of the light receiver and a transmission light source located off from the optical axis of the light receiver are set. A light is emitted to the laminate metal band from the background light source and from the transmission light source.SELECTED DRAWING: Figure 1

Description

The present invention relates to an edge recognition method for a laminated metal band suitable for use in a plate position control facility for a laminated metal band that runs continuously, and an apparatus thereof.

In the metal strip manufacturing line, in order to control the through plate position of the metal strip that runs continuously, the technology that recognizes the position of the edge of the metal strip and controls the center position of the metal strip with reference to the edge position. Is used. As an example thereof, there is a method in which a light source and a light receiver are installed at positions facing each other across the metal band, and the edge position of the metal band is detected depending on the presence or absence of light detection by the light receiver.

By the way, when the conventional plate position control is applied to the production line of the laminated metal band in which the surface of the metal band is coated with a film, the following problems have been pointed out. That is, in the production of the laminated metal band, in order to prevent the film from wrapping around the transport roll or the like during the production, a film having a width narrower than the width of the metal band is usually used. When the line is in an unstable state such as when the line is started up, the film may pop out from the metal band, and the edge of the protruding film is mistakenly recognized as the edge of the metal band. The metal band meanders downstream, and in the worst case, the metal band may come off the mail-order roll and come into contact with the equipment.

As a prior document relating to this point, Patent Document 1 describes a first sensor capable of detecting both the end face of the steel plate and the end face of the film for determining the presence or absence of film protrusion and controlling the position of the steel plate to pass through when the film protrudes. A technique using a photoelectric sensor) and a second sensor (infrared sensor) capable of detecting only the end face of a steel sheet is disclosed. Further, although Patent Document 2 does not cover the laminated metal band, it is formed on the transparent substrate by superimposing coaxial transmitted illumination light and oblique illumination illumination toward the transparent substrate. A technique for identifying an opaque device pattern in an observation image is disclosed.

Japanese Patent No. 3212079 Japanese Patent No. 5482863

However, in the technique disclosed in Patent Document 1, there is a concern that the detection accuracy of the end face of the steel sheet at the time of film protrusion may decrease depending on the setting interval of the elements constituting the second sensor (infrared sensor), and the quality of the product is improved. It was not enough to make improvements. Further, in the technique disclosed in Patent Document 2, coaxial transmission illumination light and oblique illumination illumination light are irradiated from the opposite side of the observation means including a CCD camera, and the pattern of the opaque medium is recognized in a state where the transparent medium always protrudes. Therefore, in the manufacture of laminated metal strips, when recognizing the edges of the metal strips that do not protrude from the film, the difference in brightness between the background and the metal strips becomes large, and the edges of the metal strips are erroneously recognized due to lens flare. There was a risk of doing it.

In particular, in the production of a laminated metal band, it is necessary to recognize the edge of the metal band regardless of whether or not the film protrudes. However, the brightness of the protruding part of the film is lower than that of the background without the protruding part of the film, and it is difficult to distinguish the edge of the film from the edge of the metal band. In order to increase the brightness of the protruding part of the film, a camera or the like When the aperture of the receiver is opened, the difference in brightness between the background where the film does not protrude and the metal strip becomes large, which causes lens flare, and when recognizing the edge of the laminated metal strip, There is still room for improvement.

An object of the present invention is to propose an edge recognition method for a laminated metal band and an apparatus thereof that can accurately recognize the edge of the laminated metal band regardless of whether or not the film protrudes from the laminated metal band.

In the present invention, a laminated metal band having a film coated on at least one surface is continuously run, and during the running, the edge of the laminated metal band is recognized regardless of the presence or absence of protrusion of the film. In the band edge recognition method, a light source is installed on either the front surface side or the back surface side of the laminated metal band, and the light source is placed on the optical axis of the light source on the opposite side of the laminated metal band on which the light source is installed. A background light source located in the above and a transmission light source deviated from the optical axis of the receiver are installed, and light is emitted from the background light source and the transmission light source toward the laminated metal band, and the light at that time. This is an edge recognition method for a laminated metal band, characterized in that the edge of the laminated metal band is recognized by receiving light from the light receiver.

In the edge recognition method of the laminated metal band having the above structure,
1) Using a floodlight as the background light source,
2) As the background light source, use a combination of a floodlight and a reflector that reflects the light emitted from the floodlight.
3) Using a floodlight as the transmission light source,
Is preferable as a concrete means for solving the problem.

Further, in the present invention, a laminated metal band having a film coated on at least one surface is continuously run, and during the running, the edge of the laminated metal band is recognized regardless of whether or not the film is projected. An edge recognition device for a metal band, the light source installed on either the front surface side or the back surface side of the laminated metal band, and the receiver arranged on the opposite end side of the laminated metal band on which the light source is installed. The background light source and the transmission light source respectively irradiate light toward the laminated metal band, and the background light source is on the optical axis of the receiver. The light source for transmission is an edge recognition device for a laminated metal band, which is installed off the optical axis of the receiver.

In the edge recognition device having the above configuration,
1) The background light source is a floodlight.
2) The background light source is a combination of a floodlight and a reflector that reflects the light emitted from the floodlight.
3) The transmission light source is a floodlight.
Is preferable as a concrete means for solving the problem.

According to the present invention, since the background light source located on the optical axis of the receiver and the transmission light source deviated from the optical axis of the receiver are used, the brightness can be set low as the background light source. This is possible, and in a normal state where the film does not protrude from the metal band, the edge of the metal band can be recognized without the occurrence of lens flare even when the aperture of the receiver is open. On the other hand, when the film protrudes from the metal band, the brightness of the film portion protruding from the metal band is made equal to the brightness of the background by the light emitted from the transmission light source, so that the edge portion of the metal band is equalized. Since only the difference in brightness at is clear, the edge of the metal band can be reliably recognized.

It is a figure which showed typically the laminated metal and other through-plate control equipment suitable for practicing the present invention. It is a figure which showed the image when the film did not protrude from a laminated metal band, and the graph which averaged the luminance in the longitudinal direction (vertical) at each width position of a laminated metal band. It is a figure which showed the image when the film protrudes from a laminated metal band (the amount of protrusion (one side): 100 mm), and the graph which averaged the luminance in the longitudinal direction (vertical) at each width position of a laminated metal band. .. An image in which the edge of the laminated metal band is recognized without using a transmission light source and a graph obtained by averaging the brightness in the longitudinal direction (vertical) at each width position of the laminated metal band are shown.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a diagram schematically showing a plate-passing control device for a laminated metal band suitable for carrying out the present invention, and an edge recognition device according to the present invention is incorporated in such a plate-passing control device. ing.

Reference numeral 1 in FIG. 1 is a laminated metal strip shown in a state in which a film is coated on at least one surface and the film continuously runs from the bottom to the top of the drawing. Further, reference numeral 2 is a receiver installed on one surface side of the laminated metal band 1, and 3 is a background device which is installed on the opposite side where the receiver 2 is installed and is located on the optical axis of the receiver 2. The light source 4 is a transmission light source installed on the same side as the background light source 3 and at a position deviated from the optical axis of the receiver 2.

As the background light source 3, a light source 3a in which a floodlight 3a and a reflector 3b that reflects the light emitted from the floodlight 3a are combined can be used, but the floodlight 3a may be used alone. Further, as the transmission light source 4, a floodlight can be used.

Further, reference numeral 5 in FIG. 1 is an image processing device connected to the receiver 2, 6 is a plate position controller connected to the image processing device 5, 7 is a cylinder control device connected to the plate position controller 6, and 8 is a cylinder. The cylinder 9 connected to the control device 7 is a steering roll connected to the cylinder 8.

In such equipment, a light receiver 2, a background light source 3, and a transmission light source 4 constitute an edge recognition device for a laminated metal band 1 according to the present invention.

The light (image) received by the light receiver 2 is input to the image processing device 5, and the edge position of the laminated metal band 1 is determined based on the brightness of the light. The plate-passing position controller 6 outputs the operation amount of the cylinder 8 connected to the steering roll 9 to the cylinder control device 7 based on the determination result of the image processing device 5.

In the present invention, when the film does not protrude from the laminated metal band 1, the light from the transmission light source 4 is not directly received by the light receiver 2, so that the brightness outside the laminated metal band 1, that is, , The brightness of the background is low. Therefore, lens flare does not occur even when the aperture of the receiver 2 is opened, and the edge portion of the laminated metal band 1 can be accurately recognized by the difference between the edge portion of the laminated metal band 1 and the brightness of the background. ..

On the other hand, when the film protrudes from the laminated metal band 1, the light of the transmission light source 4 is scattered at the projected film portion, and the portion of the light receiver 2 looks bright. By making the brightness of the portion that looks bright and the brightness of the background equal in advance, the edge of the laminated metal band 1 can be reliably recognized even when the film pops out.

In recognizing the edge of a laminated metal band coated with a film having a thickness of 10 to 80 μm and made of PET, an LED light source of 30 to 60 watts can be used as the background light source 3, and the transmission light source 4 An LED light source of 30 to 60 watts can be used.

When a combination of the floodlight 3a and the reflector 3b is used as the background light source 3, it is desirable to select the surface roughness of the reflector 3b so that the brightness is equivalent to the brightness of the protruding film portion. .. For example, when a light source of about 30 to 60 watts is used as the background light source 3, the surface roughness of the reflector 3b can be set to about 0.6 to 1.6 μm in terms of center line average roughness (Ra). ..

By using the reflector 3b for the background light source 3, the specifications of the floodlights of the floodlight 3a and the transmission light source 4 can be unified. However, when the floodlight 3a is used alone as the background light source 3, a film is used. It is preferable to use a light source having a low brightness having the same brightness as the protruding part.

The recognition status of the edge of the laminated metal band having a width of 1040 mm covered with a white film having a thickness of 20 μm and a width of 1020 mm on the front and back at a vertical transport location of the transport line by applying the equipment having the configuration shown in FIG. Was investigated.

The transport speed of the laminated metal band is 400 mpm, and the background light source uses a combination of a 40 W LED light source floodlight and an electrogalvanized steel sheet with a surface roughness of 1.0 μm as a reflector. As the light source for use, a floodlight of a 40 W LED light source was used. Further, as the receiver, a two-dimensional CMOS camera having 2592 pixels in the width direction of the laminated metal band and 1944 pixels in the longitudinal direction of the laminated metal or the like was used.

FIG. 2 is a diagram showing an image when the film does not protrude from the laminated metal band and a graph obtained by averaging the brightness in the longitudinal direction (vertical direction) at each width position of the laminated metal band. FIG. It is a figure which showed the image when the film protrudes from a laminated metal band (the amount of protrusion (one side): 100 mm), and the graph which averaged the brightness in the longitudinal direction (vertical) at each width position of a laminated metal band. ..

When the edge of the laminated metal band is recognized according to the present invention, the difference in edge position is within 0.2 mm, which is an error of one pixel or less of the camera, and the laminated metal regardless of whether the film is protruding or not. It was confirmed that the edge of the band can be recognized accurately.

FIG. 4 shows an image in which the edge of the laminated metal band is recognized without using a transmission light source, and a graph obtained by averaging the luminance in the longitudinal direction (vertical) at each width position of the laminated metal band. It is a thing.

In this case, the brightness changes between the metal band and the film, and the brightness level also changes depending on the film type and the like, so that it becomes difficult to reliably distinguish the edge of the film from the edge of the laminated metal band.

According to the present invention, it is possible to provide an edge recognition method and an apparatus for the laminated metal band, which can accurately recognize the edge of the film regardless of whether or not the film protrudes from the laminated metal band.

1 Laminated metal band 2 Receiver 3 Background light source 3a Floodlight 3b Reflector 4 Transmission light source 5 Image processing device 6 Through plate position controller 7 Cylinder control device 8 Cylinder 9 Steering roll

Claims (8)

A laminated metal band coated with a film on at least one surface is continuously run, and the edge of the laminated metal band is recognized regardless of whether or not the film is popped out during the running. Edge recognition of the laminated metal band In the method
A background light source and a background light source located on the optical axis of the light receiver are provided on either the front surface side or the back surface side of the laminated metal band, and on the opposite side of the laminated metal band on which the light receiver is installed. A transmission light source deviating from the optical axis of the receiver is installed, and light is emitted from the background light source and the transmission light source toward the laminated metal band, and the light at that time is received by the receiver. An edge recognition method for a laminated metal band, which comprises recognizing the edge of the laminated metal body. The edge recognition method for a laminated metal band according to claim 1, wherein a floodlight is used as the background light source. The edge recognition method for a laminated metal band according to claim 1, wherein a light source for the background is a combination of a floodlight and a reflector that reflects the light emitted from the floodlight. The edge recognition method for a laminated metal band according to any one of claims 1 to 3, wherein a floodlight is used as the transmission light source. An edge recognition device for a laminated metal band in which a laminated metal band coated with a film on at least one surface is continuously run, and the edge of the laminated metal band is recognized during the running regardless of whether or not the film is projected. And
A receiver installed on either the front side or the back surface side of the laminated metal band, and a background light source and a transmission light source arranged on the opposite end side of the laminated metal band on which the receiver is installed. Prepare,
The background light source and the transmission light source irradiate light toward the laminated metal band, respectively. The background light source is installed on the optical axis of the receiver, and the transmission light source is installed. Is an edge recognition device for a laminated metal band, which is installed off the optical axis of the light source. The edge recognition device for a laminated metal band according to claim 5, wherein the background light source is a floodlight. The edge recognition device for a laminated metal band according to claim 5, wherein the background light source comprises a combination of a floodlight and a reflector that reflects light emitted from the floodlight. The edge recognition device for a laminated metal band according to any one of claims 5 to 7, wherein the transmission light source is a floodlight.

Images