JP6241402B2 - Contact detection device, contact detection method, and wrinkle detector - Google Patents

Description

  The present invention relates to a contact detection device, a contact detection method, and a wrinkle detector that detect that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected.

    In order to perform quality control of an inspection object such as a steel plate, a surface flaw of the inspection object is detected by a wrinkle detector.

    In Patent Document 1, in order to detect a surface flaw existing near the surface layer, a coil in which an alternating current is passed is brought close to a conductive object to be inspected, and an eddy current is generated in the object by electromagnetic induction. A technique for detecting a change in eddy current caused by wrinkles of an inspection object and performing flaw detection is disclosed (paragraph [0002] in Patent Document 1).

    Here, the gap between the object to be inspected and the soot detector is about a few millimeters. If the shape of the object to be inspected is bad, the object to be inspected and the soot detector may come into contact with each other, and soot may enter the object to be inspected. There is.

    In general, in contact detection between an object to be inspected and a wrinkle detector, a method of providing a distance sensor and measuring the distance between the material to be inspected and the wrinkle detector is used.

JP 2009-92388 A

  However, when the contact between the material to be inspected and the wrinkle detector is detected using the distance sensor, the distance sensor must be installed according to the shape of the wrinkle detector. Further, the method of detecting contact between the material to be inspected and the wrinkle detector using the distance sensor has a problem that the structure of the distance sensor is complicated and easily broken, and the cost is high. Furthermore, in order to perform contact detection with the entire width of the object to be inspected, many distance sensors must be arranged in the width direction, and there is a problem that the structure is further complicated.

  The present invention has been made for such problems, and a contact detection device can be installed regardless of the shape of the wrinkle detector, and can be realized at a low cost with a simple configuration. An object is to provide a device, a contact detection method, and a wrinkle detector.

In order to achieve the above object, the present invention has the following features.
[1] A contact detection device that detects that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected,
A conductive coating formed on the surface of the object to be inspected,
A power supply for applying a voltage to the conductive coating,
A contact detection device comprising: an ammeter that detects whether or not an electric current flows through the conductive coating portion.
[2] The contact detection device according to [1], further including a color coating portion on a surface of the conductive coating portion.
[3] A wrinkle detector comprising the contact detection device according to [1] or [2].
[4] A contact detection method for detecting that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected.
Apply a voltage to the conductive coating formed on the surface of the test object side of the 疵 detector,
A contact detection method for detecting contact between an object to be inspected and a wrinkle detector by detecting a current flowing through the conductive coating portion when the object to be inspected contacts the wrinkle detector.
[5] A color coating part is formed by further applying a color paint on the surface of the conductive coating part formed on the detector.
The contact detection method according to [4], wherein contact between the object to be inspected and the wrinkle detector is detected by detecting at least one of peeling of the color coating part and color coating having transferred to the object to be inspected.

  According to the present invention, the contact detection device can be installed regardless of the shape of the wrinkle detector. In addition, since it has a simple structure in which voltage is applied and current is detected, it can be realized simply and inexpensively.

It is a figure which shows the wrinkle detector by which the contact detection apparatus which concerns on embodiment of this invention is installed. It is a figure which shows the structure of the contact detection apparatus which concerns on embodiment of this invention, and is sectional drawing seen from the advancing direction of the to-be-inspected object. It is a figure which shows the structure of the contact detection apparatus which concerns on embodiment of this invention, and is sectional drawing which looked at the advancing direction of the to-be-inspected object from the side surface.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a wrinkle detector in which a contact detection device according to an embodiment of the present invention is installed. The inspected object 1 is, for example, a steel plate and is supported by a support roll 2. As the soot detector 3, for example, an eddy current soot detector can be used. The eddy current type detector detects the change of the eddy current caused by the test object by detecting the change of the eddy current caused by the test object. To detect. Note that the soot detector 3 is not limited to the eddy current type soot detector using electromagnetic induction, and a soot detector using an ultrasonic wave, a laser, or the like may be used.

  FIG. 2 is a diagram showing the configuration of the contact detection device according to the embodiment of the present invention, and is a cross-sectional view seen from the traveling direction of the object to be inspected. FIG. 3 is a cross-sectional view of the traveling direction of the object to be inspected as viewed from the side.

  The contact detection device 10 according to the embodiment of the present invention includes a conductive coating portion 5 formed on the surface of the inspected object 1 of the wrinkle detector 3, and a power supply 8 that applies a voltage to the conductive coating portion 5. , And an ammeter 7 for detecting whether or not a current flows through the conductive coating portion 5.

  The conductive coating portion 5 is formed on the entire surface of the wrinkle detector 3 facing the object 1 to be inspected, and is formed across the width direction of the object 1 to be inspected. The conductive coating portion 5 is formed by applying a conductive paint.

  Between the conductive coating portion 5 and the soot detector 3, an insulating coating portion 4 to which an insulating paint is applied is formed. Instead of the insulating coating part 4, an insulating material may be arranged on the surface of the soot detector 3. In addition, when the surface of the soot detector 3 is covered with an insulator, the insulator coating portion 4 may not be provided. Further, a color coating portion 6 formed by applying a color paint is formed on the surface layer of the conductive coating portion 5. In addition, it is preferable to use a color paint that is easy to transfer color to the inspection object 1 when the wrinkle detector 3 comes into contact with the inspection object 1.

  Next, operation | movement of the contact detection apparatus 10 comprised in this way is demonstrated.

  In FIG. 1, it is assumed that the device under test 1 is moving toward the front of the paper at a high speed while being supported by the support roll 2. The soot detector 3 detects the soot by detecting the change in the eddy current caused by the soot of the test object by causing an eddy current to be generated in the test object by electromagnetic induction by bringing a coil through which an alternating current has passed. .

  During the inspection by the scissors detector 3, a voltage is applied from the power source 8 to the conductive coating portion 5, and the current is measured by the ammeter 7. In a state where the device under test 1 and the soot detector 3 are not in contact with each other, no current flows in the conductive coating portion 5.

  On the other hand, when the shape of the device under test 1 is poor and the soot detector 3 comes into contact with the device under test 1, a current flows to the device under test 1 through the soot detector 3 conductive coating 5, and an ammeter 7, it is detected that a current has flowed. By detecting whether or not an electric current has flowed through the conductive coating portion 5 with the ammeter 7, it is possible to detect whether or not the eyelid detector 3 is in contact with the inspected object 1.

  Further, when the wrinkle detector 3 comes into contact with the inspection object 1, the coating of the color coating part 6 formed on the surface of the conductive coating part 5 is peeled off, and the peeled coating adheres to the inspection object 1. . If the ammeter 7 only detects whether or not the eyelid detector 3 is in contact with the object 1 to be inspected, the ammeter 7 may detect a noise, thereby causing a false detection. Therefore, by checking at least one of the color paint applied to the inspected object 1 together with the current value of the ammeter 7 and the color paint transferred to the inspected object 1 by visual observation or the like, the inspected object 1 is more accurately detected. It can be detected that the soot detector 3 is in contact.

  Further, by detecting the color paint transferred to the inspection object 1, it is possible to know at which position of the inspection object 1 the wrinkle detector 3 is in contact with the inspection object 1.

  If the conductive coating portion 5 is provided, it can be detected that the wrinkle detector 3 is in contact with the object to be inspected 1, and therefore the color coating portion 6 may not be provided.

  According to the present invention, since the contact is detected only by detecting the current flowing between the eyelid detector 3 and the device under test 1, a simple and inexpensive structure can be realized. Furthermore, since it is only necessary to coat the surface of the soot detector 3 with a conductive paint, the contact detection device 10 can be installed regardless of the shape of the soot detector 1.

  Further, by applying the color coating portion 6 on the conductive coating portion 5, the color paint is peeled off at the time of contact. Therefore, at the time of contact detection, it can be confirmed that the actual contact has occurred by peeling off the paint. . In addition, by adopting a color paint having a good color transfer property, the color paint can be transferred to the object to be inspected 1 at the time of contact, and it can be determined which part of the object 1 has been in contact. It is possible to easily determine whether there is an existing bag or a bag due to the contact of the detector 3 with the test object 1.

DESCRIPTION OF SYMBOLS 1 Test object 2 Support roll 3 Haze detector 4 Insulation coating part 5 Conductive coating part 6 Color coating part 7 Ammeter 8 Power supply 10 Contact detection device

Claims (5)

A contact detection device that detects that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected,
The object to be inspected is a steel plate,
A conductive coating formed on the entire surface of the detector side of the heel detector;
A power supply for applying a voltage to the conductive coating,
A contact detection device comprising: an ammeter that detects whether or not an electric current flows through the conductive coating portion.   The contact detection device according to claim 1, further comprising a color coating portion on a surface of the conductive coating portion.   A wrinkle detector comprising the contact detection device according to claim 1. A contact detection method for detecting that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected.
The object to be inspected is a steel plate,
電 圧 Apply voltage to the conductive coating formed on the entire surface of the detector side of the detector,
A contact detection method for detecting contact between an object to be inspected and a wrinkle detector by detecting a current flowing through the conductive coating portion when the object to be inspected contacts the wrinkle detector. A contact detection method for detecting that a wrinkle detector that detects wrinkles of an object to be inspected has come into contact with the object to be inspected.
Apply a voltage to the conductive coating formed on the surface of the test object side of the 疵 detector,
When the object to be inspected comes into contact with the wrinkle detector, it detects the current that flows through the conductive coating,
カ ラ ー Color coating is formed by coating the surface of the conductive coating formed on the detector with color paint.
Peeling of color coating unit, and the contact touch sensing how to detect contact between the object to be inspected and the flaw detector by detecting at least one of a color transfer the color coating on the test subject.

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