WO2011056040A2 - Non-destructive detecting apparatus using a magnetic flux leakage measurement - Google Patents

Non-destructive detecting apparatus using a magnetic flux leakage measurement Download PDF

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WO2011056040A2
WO2011056040A2 PCT/KR2010/007865 KR2010007865W WO2011056040A2 WO 2011056040 A2 WO2011056040 A2 WO 2011056040A2 KR 2010007865 W KR2010007865 W KR 2010007865W WO 2011056040 A2 WO2011056040 A2 WO 2011056040A2
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permanent magnet
magnetic flux
destructive
magnetic
magnetic field
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PCT/KR2010/007865
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French (fr)
Korean (ko)
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WO2011056040A3 (en
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유권상
박수영
이윤희
윤기봉
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한국표준과학연구원
중앙대학교 산학협력단
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Publication of WO2011056040A2 publication Critical patent/WO2011056040A2/en
Publication of WO2011056040A3 publication Critical patent/WO2011056040A3/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
    • G01N27/87—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws

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  • the present invention is a non-destructive flaw detection apparatus by the measurement of the leakage magnetic flux that can be run, More specifically, the drive wheel is attached to the body; and the permanent magnet provided on the body to form a attraction force between the body and the magnetic subject; And a sensor support part provided in the body and fixing a magnetic field detection sensor for detecting a leakage magnetic flux generated at a defective portion of the subject magnetized by the permanent magnet.
  • Non-destructive methods used to check for defects include visual inspection (VT), penetration inspection (PT), ultrasonic inspection (UT), radiographic inspection (RT), eddy current inspection (ECT), and radiographic reading There is a way.
  • Visual inspection and ultrasonic flaw detection have the disadvantage of low reliability and reproducibility depending on the experience and subjectivity of the inspector, and radiographic inspection has the disadvantage that flaw detection is difficult for linear defects such as cracks perpendicular to the flaw surface.
  • Silver can only detect defects on or near the surface of the conductor material.
  • Magnetic Flux Leakage (MFL) is a ferromagnetic material that can be used only in structures because it uses magnetic fields. However, it is relatively easy to inspect and affects the size and shape of the specimen. Receives less and is easier to identify the type of defect.
  • FIG. 1 illustrates a phenomenon in which magnetic flux leaks from a defective part.
  • the defect 61 causes a large magnetoresistance, and the bypassed magnetic flux is focused around the defect, resulting in the effective magnetic field.
  • Increases strength A large increase in magnetic induction increases the effective magnetic field strength.
  • the subject is subjected to tensile stress by internal stress, which causes the defect of the subject to act as a stress riser, thereby increasing the permeability around the defect. Therefore, the magnetic force lines flowing through the subject are concentrated at the bottom of the defect with increased permeability, as shown in FIG. 1, and the magnetic force lines behave like a magnetic line dipole in this small region.
  • This dipole is called a 'detour flux dipole'. This dipole has the same direction as the disturbed magnetic field in the subject and produces a magnetic field opposite to the leakage flux in the defect. Therefore, defects can be detected by measuring leakage flux on the opposite side and on the other side.
  • the equipment for detecting the leakage magnetic flux as described above has been proposed in various ways, but examples thereof include a yoke type flaw detector.
  • the flaw detector comprises a yoke for magnetizing a subject and a power supply for applying a current to a coil wound on the yoke, a magnetic field detection sensor, and an analysis device for analyzing output signals of the magnetic field detection sensor.
  • the conventional flaw detector such as the yoke type requires a current supply, a yoke suitable for an object to be inspected, and the yoke and the magnetic field detection sensor are separately disposed, and thus the configuration thereof is complicated.
  • Figure 3 is a non-destructive flaw detector (13) using the ultrasonic probe (6)
  • the flaw detector is attached to the subject 1 by the wheel 14 made of magnets, and travels.
  • the magnet is nothing more than a tool for attachment between the subject and the flaw detector.
  • An object of the present invention is to provide a non-destructive flaw detection device by leak flux measurement that can solve the inconvenience of the conventional leak magnetic flux detection equipment as described above, and can be applied to the other traveling type detection equipment.
  • the present invention proposes a non-destructive flaw detection apparatus that can be provided with a permanent magnet and a leakage flux detection sensor.
  • the conventional non-destructive flaw detection device is provided with a permanent magnet on the wheel, but attached to the subject, while the present invention is provided with a permanent magnet on the body to give an attachment force while the wheel itself is easy to move, and furthermore, the permanent magnet
  • Non-destructive flaw detection apparatus by measuring the leakage flux includes a body with a driving wheel; and a permanent magnet provided on the body to form a attraction force between the body and the magnetic subject; And a sensor support part provided on the body and fixing a magnetic field detection sensor for detecting a leakage magnetic flux generated at a defective portion of the subject magnetized by the permanent magnet.
  • the permanent magnet is preferably accommodated inside the body.
  • the magnetic field detection sensor 500 may be selected from one or more of a search coil, a flux gate, a hall effect, a GMR, a TMR, an AMR, and a PHR sensor.
  • the non-destructive flaw detector of the present invention enables non-destructive flaw detection by the leak magnetic flux measurement method with only a simple configuration.
  • the detection equipment is integrated.
  • the permanent magnet used for attachment to the subject can be utilized for the purpose of magnetization, so that the existing non-destructive testing apparatus is provided with only the sensor support, so that defect inspection by measuring leakage flux is possible.
  • the present invention provides a permanent magnet in the body to freely move the wheel, and allows a constant magnetic field to be formed using a fixed permanent magnet to detect precise leakage magnetic flux. do.
  • 1 is a view of the leakage magnetic flux generated in the defect site of the magnetized subject.
  • Figure 2 is a non-destructive flaw detection apparatus by the conventional leakage flux measurement.
  • FIG. 3 is a view of a non-destructive inspection device having a conventional magnetic wheel.
  • FIG. 4 is a perspective view of a non-destructive flaw detector of the present invention.
  • Figure 5 is a side view showing the operating principle of the non-destructive flaw detection apparatus of the present invention.
  • FIG 4 is a perspective view of the non-destructive flaw detection apparatus 1000 of the present invention
  • Figure 5 is a side view showing the operating principle of the non-destructive flaw detection apparatus 1000 of the present invention.
  • the non-destructive flaw detection apparatus 1000 includes a body 100 to which the driving wheel 200 is attached; and the body 100 and the body 100 and the magnetic object 600.
  • Permanent magnet 300 to form a attraction between;
  • a sensor support part provided in the body 100 to fix the magnetic field detection sensor 500 for detecting the leakage magnetic flux generated at the defect 610 of the subject 600 magnetized by the permanent magnet 300. 400; consists of.
  • Body 100 may be a separate configuration for accommodating the leakage flux measurement configuration of the present invention as a configuration for accommodating a variety of flaw detection equipment, or may be a configuration using an existing device equipped with other ultrasonic flaw detection equipment.
  • a driving wheel 200 for driving the body 100 is attached to the lower portion of the body 100 as shown in FIG.
  • the shape and operation method of the driving wheel 200 is not limited, but in the present invention, four driving wheels 200 are provided in front, rear, left and right, and in particular, the driving wheel 200 is made of rubber. It will be easy when driving on the road.
  • the permanent magnet 300 is provided inside the body 100 to form an attraction force between the magnetic test object 600 and the body 100.
  • the body 100 is configured to maintain attachment without being detached when traveling on the subject 600.
  • Permanent magnet 300 may be provided in any portion of the body 100, but as shown in Figure 5 it is preferable that the body 100 is provided near the bottom center of gravity that can be most stably attached.
  • the permanent magnet 300 is not only a configuration for attachment, but also a configuration for magnetizing the subject 600. That is, the subject 600 within the traveling range is magnetized by placing the subject 600 within the magnetic field of the permanent magnet 300 in the flaw detector according to the present invention. If there is a defect 610 in the magnetized object 600, the magnetic flux of the permanent magnet 300 leaks to the defect 610.
  • the body 100 is provided with a sensor support part 400.
  • the sensor support part 400 is a magnetic field detecting sensor for detecting the leakage magnetic flux as described above, such as a search coil, a flux gate, a hall effect, a GMR, a TMR, an AMR, a PHR, and the like.
  • Various magnetic field sensors can be applied alone or in combination of two or more.
  • the sensor support 400 is preferably provided so that the magnetic field detection sensor 500 is detachable.
  • the flaw detector is used for other flaw detection of the subject 600, and when necessary, the magnetic field detection sensor 500 is attached to the sensor support 400, and as the non-destructive flaw detector 1000 according to the leakage flux measurement of the present invention. It can also be used.
  • the non-destructive flaw detector of the present invention enables non-destructive flaw detection by the leak magnetic flux measurement method with only a simple configuration.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

The present invention is a non-destructive detecting apparatus using a magnetic flux leakage measurement, which prevents the inconveniences of magnetic flux leakage detection equipment, and which can simultaneously be complexly applicable to other traveling-type detection equipment. In detail, the non-destructive detecting apparatus using a magnetic flux leakage measurement comprises: a main body having driving wheels attached thereto; a permanent magnet arranged in the main body so as to produce an attracting force between the main body and an object to be detected; and a sensor support unit arranged in the main body in order to fix a magnetic field detection sensor for detecting the magnetic flux leakage occurring in the defective portion of the object to be detected, which is magnetized by the permanent magnet.

Description

누설자속 측정에 의한 비파괴 탐상장치Non-destructive testing device by measuring leakage flux
본 발명은 주행가능한 누설자속 측정에 의한 비파괴 탐상장치로서, 더욱 상세하게는 구동바퀴가 부착된 몸체;와 상기 몸체에 구비되어 몸체와 자성의 피검체 사이에 인력을 형성하는 영구자석; 및 상기 몸체에 구비되며 상기 영구자석에 의해 자화된 상기 피검체의 결함부위에서 발생하는 누설자속을 검출하는 자기장 검출센서를 고정하는 센서지지부;로 이루어진 누설자속 측정에 의한 비파괴 탐상장치이다.The present invention is a non-destructive flaw detection apparatus by the measurement of the leakage magnetic flux that can be run, More specifically, the drive wheel is attached to the body; and the permanent magnet provided on the body to form a attraction force between the body and the magnetic subject; And a sensor support part provided in the body and fixing a magnetic field detection sensor for detecting a leakage magnetic flux generated at a defective portion of the subject magnetized by the permanent magnet.
구조물에 발생한 국부적인 결함은 구조체 일부분의 문제가 아니라 구조물 전체의 내구성을 저하시키게 되므로 안전과 품질 확보를 위해서는 철저한 검사가 필요하다. 즉 결함을 정밀하게 평가하는 것은 구조물 전체의 건전성 및 안정성 측면에서 대단히 중요할 뿐만 아니라 수명연장을 위해 공학적으로 중요하다.Local defects in the structure are not a problem of the part of the structure but degrade the durability of the entire structure, so thorough inspection is necessary to ensure safety and quality. In other words, the precise evaluation of defects is not only important for the integrity and stability of the structure as a whole, but also for engineering the life.
결함을 검사하기 위하여 사용되는 비파괴적 방법으로는 육안 검사(VT), 침투탐상검사(PT), 초음파 탐상검사(UT), 방사선 투과검사(RT), 와전류 탐상법(ECT), 방사선 사진 판독 등에 의한 방법이 있다. 육안검사, 초음파 탐상검사는 검사자의 경험 및 주관에 의존하여 신뢰성 및 재현성이 적은 단점이 있고, 방사선 투과검사는 탐상 면에 수직한 균열 등의 선형결함에 대해 탐상이 어려운 단점이 있으며, 와전류 탐상법은 전도체 재료의 표면 또는 표면 근처의 결함만을 탐상할 수 있다. 피검체의 내외부 벽의 결함에 의해 누설되는 자속을 측정하는 누설자속 (MFL:Magnetic Flux Leakage) 측정법은 자기장을 사용하기 때문에 강자성체로 구조체에서만 사용할 수 있지만 검사가 비교적 쉽고 시험체의 크기나 형상 등에 영향을 적게 받으며 결함의 종류를 식별하기에 용이하다.Non-destructive methods used to check for defects include visual inspection (VT), penetration inspection (PT), ultrasonic inspection (UT), radiographic inspection (RT), eddy current inspection (ECT), and radiographic reading There is a way. Visual inspection and ultrasonic flaw detection have the disadvantage of low reliability and reproducibility depending on the experience and subjectivity of the inspector, and radiographic inspection has the disadvantage that flaw detection is difficult for linear defects such as cracks perpendicular to the flaw surface. Silver can only detect defects on or near the surface of the conductor material. Magnetic Flux Leakage (MFL) is a ferromagnetic material that can be used only in structures because it uses magnetic fields. However, it is relatively easy to inspect and affects the size and shape of the specimen. Receives less and is easier to identify the type of defect.
도 1은 결함부위에서 자속이 누설되는 현상을 설명하고 있는데 피검체(60)를 자화 시켰을 때 결함(61)은 큰 자기저항을 일으키고 이때 우회한 자속은 결함 주위에 집속하게 되어 결과적으로 유효 자기장의 세기를 증가시킨다. 자기유도의 큰 증가는 유효 자기장 세기를 증가시킨다. 피검체는 내부응력에 의해 인장응력을 받게 되고, 이로 인해 피검체의 결함은 응력 상승자(stress riser) 역할을 하게 되어 결함 주변에 투자율이 증가한다. 따라서 피검체를 흐르는 자기력선은 도 1에서 보이는 바와 같이 투자율이 증가한 결함의 밑 부분에 집속되어 흐르게 되고, 이 작은 영역에서 자기력선은 magnetic line dipole 같이 거동한다. 이 dipole을 'detour flux dipole'이라 한다. 이 dipole은 피검체 내의 교란된 자기장과 같은 방향을 갖고, 결함 내의 누설자속과 반대방향을 갖는 자기장을 생성시킨다. 따라서 결함이 존재하는 편에서도 반대편에서도 누설자속을 측정함으로써 결함을 탐지할 수 있다. 1 illustrates a phenomenon in which magnetic flux leaks from a defective part. When the subject 60 is magnetized, the defect 61 causes a large magnetoresistance, and the bypassed magnetic flux is focused around the defect, resulting in the effective magnetic field. Increases strength A large increase in magnetic induction increases the effective magnetic field strength. The subject is subjected to tensile stress by internal stress, which causes the defect of the subject to act as a stress riser, thereby increasing the permeability around the defect. Therefore, the magnetic force lines flowing through the subject are concentrated at the bottom of the defect with increased permeability, as shown in FIG. 1, and the magnetic force lines behave like a magnetic line dipole in this small region. This dipole is called a 'detour flux dipole'. This dipole has the same direction as the disturbed magnetic field in the subject and produces a magnetic field opposite to the leakage flux in the defect. Therefore, defects can be detected by measuring leakage flux on the opposite side and on the other side.
상기와 같은 누설자속을 검출하는 장비는 다양하게 제안되어 왔으나 그 일례로 도 2와 같이 요크타입의 탐상장치를 들 수 있다. 탐상장치는 피검체를 자화시키기 위한 요크 및 요크에 권선된 코일에 전류를 인가하는 전원공급기, 자기장 검출센서 및 자기장 검출센서의 출력신호를 분석하는 분석장비등으로 이루어진다. 이러한 요크타입등의 종래의 탐상장치는 전류의 공급이 필요하고 피검체에 맞는 요크가 제공되어야 하며 요크와 자기장 검출 센서가 별도로 배치되는 등 그 구성이 복잡한 문제점이 있다.The equipment for detecting the leakage magnetic flux as described above has been proposed in various ways, but examples thereof include a yoke type flaw detector. The flaw detector comprises a yoke for magnetizing a subject and a power supply for applying a current to a coil wound on the yoke, a magnetic field detection sensor, and an analysis device for analyzing output signals of the magnetic field detection sensor. The conventional flaw detector such as the yoke type requires a current supply, a yoke suitable for an object to be inspected, and the yoke and the magnetic field detection sensor are separately disposed, and thus the configuration thereof is complicated.
또한 연속적인 탐상을 위해 피검체를 이동시켜야 하는 불편함이 따르거나 혹은 탐상장치를 설치상태에서 수동으로 설치해제하고 다시 다른 부위에 설치해야 하는 번거로움이 따를 수밖에 없는 문제점이 있다.In addition, there is a problem that the inconvenience of having to move the subject for continuous scanning or to follow the hassle of having to manually remove the scanning device in the installation state and install again in another part.
한편, 이러한 탐상과정의 번거로움을 해소하고자 도 3등에 도시되듯이 종래의 비파괴 탐상법에서는 주행가능한 탐상장치(13)등을 제안하고 있는데 도 3은 초음파 탐촉자(6)를 이용한 비파괴 탐상장치(13)로서 탐상장치가 자석으로 이루어진 바퀴(14)에 의해 피검체상(1)에 부착되며 주행하게 된다. 여기서 자석은 피검체와 탐상장치 사이에 부착을 위한 도구에 지나지 않는다.On the other hand, in order to eliminate the trouble of such a flaw detection process, the conventional non-destructive flaw detection method is proposed in the conventional non-destructive flaw detection method 13, etc. Figure 3 is a non-destructive flaw detector (13) using the ultrasonic probe (6) As a result, the flaw detector is attached to the subject 1 by the wheel 14 made of magnets, and travels. Here, the magnet is nothing more than a tool for attachment between the subject and the flaw detector.
본 발명의 목적은 상기와 같은 종래의 누설자속 검출장비의 불편함을 해소하고 동시에 상기의 다른 주행형 검출장비에 복합적으로 적용가능한 누설자속 측정에 의한 비파괴 탐상장치를 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a non-destructive flaw detection device by leak flux measurement that can solve the inconvenience of the conventional leak magnetic flux detection equipment as described above, and can be applied to the other traveling type detection equipment.
상기 과제를 해결하기 위하여 본 발명은 영구자석과 누설자속 검출센서를 구비할 수 있는 비파괴 탐상장치를 제안한다. 특히 종래의 일반적인 비파괴 탐상장치가 영구자석을 바퀴 등에 구비하여 피검체에 부착하는데 그쳤던 반면 본 발명은 영구자석을 몸체에 구비하여 부착 힘을 주는 반면 바퀴의 이동 자체는 용이하게 하였고, 나아가 영구자석을 또 다르게 피검체을 자화하는 용도로 사용하여 자화된 피검체의 결함부위에서 발생하는 누석자속을 검출가능하게 함으로써 간소한 탐상장치로 누설자속 측정법을 적용가능하도록 하였다.In order to solve the above problems, the present invention proposes a non-destructive flaw detection apparatus that can be provided with a permanent magnet and a leakage flux detection sensor. In particular, the conventional non-destructive flaw detection device is provided with a permanent magnet on the wheel, but attached to the subject, while the present invention is provided with a permanent magnet on the body to give an attachment force while the wheel itself is easy to move, and furthermore, the permanent magnet In addition, it is possible to detect leaky magnetic flux generated at the defective part of the magnetized subject by using it for the purpose of magnetizing the subject, thereby making it possible to apply the leakage flux measurement method to a simple flaw detector.
본 발명에 의한 누설자속 측정에 의한 비파괴 탐상장치는 구동바퀴가 부착된 몸체;와 상기 몸체에 구비되어 몸체와 자성의 피검체 사이에 인력을 형성하는 영구자석; 및 상기 몸체에 구비되며 상기 영구자석에 의해 자화된 상기 피검체의 결함부위에서 발생하는 누설자속을 검출하는 자기장 검출센서를 고정하는 센서지지부;로 이루어진다. Non-destructive flaw detection apparatus by measuring the leakage flux according to the present invention includes a body with a driving wheel; and a permanent magnet provided on the body to form a attraction force between the body and the magnetic subject; And a sensor support part provided on the body and fixing a magnetic field detection sensor for detecting a leakage magnetic flux generated at a defective portion of the subject magnetized by the permanent magnet.
이때, 상기 영구자석은 몸체 내부에 수용된 것이 바람직하다. At this time, the permanent magnet is preferably accommodated inside the body.
한편, 상기 자기장 검출센서(500)는 Search coil, Flux gate, Hall Effect, GMR, TMR, AMR 및 PHR 센서중 하나 이상 선택되는 것을 특징으로 한다.The magnetic field detection sensor 500 may be selected from one or more of a search coil, a flux gate, a hall effect, a GMR, a TMR, an AMR, and a PHR sensor.
본 발명의 비파괴 탐상장치는 간소한 구성만으로 누설자속 측정법에 의한 비파괴 탐상을 가능하게 한다.The non-destructive flaw detector of the present invention enables non-destructive flaw detection by the leak magnetic flux measurement method with only a simple configuration.
탐상장치 자체가 피검체 위를 이동하며 검사하므로 종래 피검체 자체를 이동시키거나 탐상장치를 수차례 탈부착해야 했던 번거로움이 사라진다. Since the inspection apparatus itself moves over the subject and inspects, the inconvenience of having to move the subject itself or detach the inspection apparatus several times is eliminated.
자기장 검출센서와 영구자석이 하나의 탐상장치에 구비되므로 검출장비가 일체화된다.Since the magnetic field detection sensor and the permanent magnet are provided in one flaw detector, the detection equipment is integrated.
전자석이 아닌 영구자석에 의한 자기장을 형성하므로 추가적인 배선이나 전원공급의 문제점이 발생하지 않는다.Since the magnetic field is formed by the permanent magnet instead of the electromagnet, no additional wiring or power supply problems occur.
영구자석 또는 자기장 검출센서를 교체함으로써 수리가 신속하고 쉽게 이루어질 수 있다.Repairs can be made quickly and easily by replacing permanent magnets or magnetic field sensors.
또 기존에 피검체과의 부착을 위해 사용되던 영구자석을 자화의 목적으로 활용가능하므로 기존의 비파괴 탐상장치에 센서지지부만을 구비하면 누설자속 측정에 의한 결함 검사가 가능해진다. In addition, the permanent magnet used for attachment to the subject can be utilized for the purpose of magnetization, so that the existing non-destructive testing apparatus is provided with only the sensor support, so that defect inspection by measuring leakage flux is possible.
이로써 단일의 탐사장치가 누설자속 측정법을 포함한 다양한 검사기능을 수행할 수 도 있다. This allows a single probe to perform a variety of inspection functions, including leakage flux measurement.
한편, 종래에 바퀴 등에 영구자석을 이용하였으나 본 발명은 영구자석을 몸체에 구비하여 바퀴의 이동을 자유롭게 하는 한편, 고정된 영구자석을 이용하여 일정한 자기장이 형성되도록 하여 정밀한 누설자속을 검출할 수 있도록 한다. Meanwhile, although a permanent magnet is conventionally used in a wheel or the like, the present invention provides a permanent magnet in the body to freely move the wheel, and allows a constant magnetic field to be formed using a fixed permanent magnet to detect precise leakage magnetic flux. do.
도 1은 자화된 피검체의 결함부위에서 발생되는 누설자속의 모습.1 is a view of the leakage magnetic flux generated in the defect site of the magnetized subject.
도 2는 종래의 누설자속 측정에 의한 비파괴 탐상장치.Figure 2 is a non-destructive flaw detection apparatus by the conventional leakage flux measurement.
도 3은 종래의 자속차륜을 구비한 비파괴 검사장치의 모습.3 is a view of a non-destructive inspection device having a conventional magnetic wheel.
도 4는 본 발명의 비파괴 탐상장치의 사시도.4 is a perspective view of a non-destructive flaw detector of the present invention.
도 5는 본 발명의 비파괴 탐상장치의 작동원리를 보여주는 측면도.Figure 5 is a side view showing the operating principle of the non-destructive flaw detection apparatus of the present invention.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
1000 : 비파괴 탐상장치1000: nondestructive testing device
100 : 몸체100: body
200 : 구동바퀴200: driving wheel
300 : 영구자석300: permanent magnet
400 : 센서지지부400: sensor support
500 : 자기장 검출센서500: magnetic field detection sensor
600 : 피검체600: subject
610 : 결함610: Defect
이하, 첨부한 도면을 참고로 하여 본 발명의 누설자속 측정에 의한 비파괴 탐상장치(1000)를 상세히 설명한다. Hereinafter, with reference to the accompanying drawings will be described in detail the non-destructive flaw detection apparatus 1000 by the leakage flux measurement of the present invention.
도 4는 본 발명의 비파괴 탐상장치(1000)의 사시도이며 도 5는 본 발명의 비파괴 탐상장치(1000)의 작동원리를 보여주는 측면도이다.4 is a perspective view of the non-destructive flaw detection apparatus 1000 of the present invention, Figure 5 is a side view showing the operating principle of the non-destructive flaw detection apparatus 1000 of the present invention.
본 발명에 의한 누설자속 측정에 의한 비파괴 탐상장치(1000)는 구동바퀴(200)가 부착된 몸체(100);와 상기 몸체(100)에 구비되어 몸체(100)와 자성의 피검체(600) 사이에 인력을 형성하는 영구자석(300); 및 상기 몸체(100)에 구비되며 상기 영구자석(300)에 의해 자화된 상기 피검체(600)의 결함(610)부위에서 발생하는 누설자속을 검출하는 자기장 검출센서(500)를 고정하는 센서지지부(400);로 이루어진다.The non-destructive flaw detection apparatus 1000 according to the leakage magnetic flux measurement according to the present invention includes a body 100 to which the driving wheel 200 is attached; and the body 100 and the body 100 and the magnetic object 600. Permanent magnet 300 to form a attraction between; And a sensor support part provided in the body 100 to fix the magnetic field detection sensor 500 for detecting the leakage magnetic flux generated at the defect 610 of the subject 600 magnetized by the permanent magnet 300. 400; consists of.
몸체(100)는 각종 탐상장비를 수용하기 위한 구성으로 본 발명의 누설자속 측정용 구성을 수용하는 별개의 구성일 수 있거나 다른 초음파등 탐상장비가 구비된 기존의 장치를 이용할하는 구성일 수도 있다. 도 4와 같이 상기 몸체(100)의 하부에는 몸체(100)를 주행시키는 구동바퀴(200)가 부착되어 있다. 상기 구동바퀴(200)의 형상 및 작동방법이 한정되는 것은 아니나 본 발명에서는 앞뒤 좌우로 4개의 구동바퀴(200)가 구비되며 특히 상기 구동바퀴(200)는 고무로 제작되는 것이 피검체(600)상에서의 주행시 용이할 것이다. Body 100 may be a separate configuration for accommodating the leakage flux measurement configuration of the present invention as a configuration for accommodating a variety of flaw detection equipment, or may be a configuration using an existing device equipped with other ultrasonic flaw detection equipment. A driving wheel 200 for driving the body 100 is attached to the lower portion of the body 100 as shown in FIG. The shape and operation method of the driving wheel 200 is not limited, but in the present invention, four driving wheels 200 are provided in front, rear, left and right, and in particular, the driving wheel 200 is made of rubber. It will be easy when driving on the road.
영구자석(300)은 몸체(100)의 내부에 구비되어 자성의 피검체(600)와 몸체(100)간에 인력을 형성한다. 즉 몸체(100)가 피검체(600)상에서 주행시 이탈되는 일이 없이 부착이 유지되도록 하는 구성이다. 영구자석(300)은 몸체(100)의 어느 부위에 구비되어도 무방하나 도 5에 도시한 바와 같이 몸체(100)가 가장 안정적으로 부착될 수 있는 바닥 무게중심 인근에 구비되는 것이 바람직하다.The permanent magnet 300 is provided inside the body 100 to form an attraction force between the magnetic test object 600 and the body 100. In other words, the body 100 is configured to maintain attachment without being detached when traveling on the subject 600. Permanent magnet 300 may be provided in any portion of the body 100, but as shown in Figure 5 it is preferable that the body 100 is provided near the bottom center of gravity that can be most stably attached.
본 발명에서는 상기 영구자석(300)이 부착을 위한 구성일 뿐만 아니라 피검체(600)를 자화시키는 구성이기도 하다. 즉 본 발명의 탐상장치내의 영구자석(300)에 의한 자기장내에 피검체(600)가 위치함으로써 주행범위내의 피검체(600)가 자화되게 된다. 만일 자화된 피검체(600)에 결함(610)이 있는 경우 결함(610)부분으로 영구자석(300)의 자속이 누설되는 것이다.In the present invention, the permanent magnet 300 is not only a configuration for attachment, but also a configuration for magnetizing the subject 600. That is, the subject 600 within the traveling range is magnetized by placing the subject 600 within the magnetic field of the permanent magnet 300 in the flaw detector according to the present invention. If there is a defect 610 in the magnetized object 600, the magnetic flux of the permanent magnet 300 leaks to the defect 610.
상기 몸체(100)에는 센서지지부(400)가 구비되어 있는데 상기 센서지지부(400)는 상술한 누설자속을 검출하는 자기장 검출센서로 Search coil, Flux gate, Hall Effect, GMR, TMR, AMR, PHR 등 다양한 자기장 검출센서가 단독으로 혹은 둘 이상 조합되어 제한 없이 적용가능 하다. The body 100 is provided with a sensor support part 400. The sensor support part 400 is a magnetic field detecting sensor for detecting the leakage magnetic flux as described above, such as a search coil, a flux gate, a hall effect, a GMR, a TMR, an AMR, a PHR, and the like. Various magnetic field sensors can be applied alone or in combination of two or more.
한편, 상기 센서지지부(400)는 자기장 검출센서(500)가 탈착가능하도록 구비되는 것이 바람직하다. 평소에 탐상장치는 피검체(600)의 다른 탐상을 위해 사용되다가 필요시에 자기장 검출센서(500)를 센서지지부(400)에 부착하여 본 발명의 누설자속 측정에 의한 비파괴 탐상장치(1000)로서 이용할 수도 있는 것이다.On the other hand, the sensor support 400 is preferably provided so that the magnetic field detection sensor 500 is detachable. Usually, the flaw detector is used for other flaw detection of the subject 600, and when necessary, the magnetic field detection sensor 500 is attached to the sensor support 400, and as the non-destructive flaw detector 1000 according to the leakage flux measurement of the present invention. It can also be used.
본 발명은 상기한 실시예에 한정되지 아니하며, 적용범위가 다양함은 물론이고, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 다양한 변형 실시가 가능한 것은 물론이다. The present invention is not limited to the above-described embodiments, and the scope of application is not limited, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.
본 발명의 비파괴 탐상장치는 간소한 구성만으로 누설자속 측정법에 의한 비파괴 탐상을 가능하게 한다.The non-destructive flaw detector of the present invention enables non-destructive flaw detection by the leak magnetic flux measurement method with only a simple configuration.

Claims (3)

  1. 구동바퀴(200)가 부착된 몸체(100);와Body 100 is attached to the driving wheel 200; And
    상기 몸체(100)에 구비되어 몸체(100)와 자성의 피검체(600) 사이에 인력을 형성하는 영구자석(300); 및A permanent magnet 300 provided in the body 100 to form an attractive force between the body 100 and the magnetic object 600; And
    상기 몸체(100)에 구비되며 상기 영구자석(300)에 의해 자화된 상기 피검체(600)의 결함(610)부위에서 발생하는 누설자속을 검출하는 자기장 검출센서를 고정하는 센서지지부(400);로 이루어진 누설자속 측정에 의한 비파괴 탐상장치(1000).A sensor support part 400 provided in the body 100 to fix a magnetic field detection sensor for detecting a leakage magnetic flux generated at a defect 610 of the object 600 magnetized by the permanent magnet 300; Non-destructive flaw detection device (1000) by measuring the leakage flux consisting of.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 영구자석(300)은 몸체(100) 내부에 수용된 것을 특징으로 하는 누설자속 측정에 의한 비파괴 탐상장치(1000).The permanent magnet 300 is a non-destructive flaw detection device 1000 by measuring the leakage flux, characterized in that accommodated inside the body (100).
  3. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2,
    상기 자기장 검출센서(500)는 Search coil, Flux gate, Hall Effect, GMR, TMR, AMR 및 PHR 센서중 하나 이상 선택되는 것을 특징으로 하는 누설자속 측정에 의한 비파괴 탐상장치(1000).The magnetic field detection sensor (500) is a non-destructive flaw detection apparatus (1000) by measuring the leakage flux, characterized in that at least one selected from the search coil, flux gate, Hall Effect, GMR, TMR, AMR and PHR sensors.
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CN111751440A (en) * 2020-06-17 2020-10-09 清华大学 Steel defect internal and external magnetic disturbance comprehensive detection device and detection method
CN111751440B (en) * 2020-06-17 2022-07-01 清华大学 Steel defect internal and external magnetic disturbance comprehensive detection device and detection method
CN112834606A (en) * 2021-01-07 2021-05-25 清华大学 Method and device for identifying defects of inner wall and outer wall based on focusing magnetic flux leakage composite detection
CN113945628A (en) * 2021-11-09 2022-01-18 中国特种设备检测研究院 Magnetic field adjusting device and method for large-scale storage tank wall plate magnetic flux leakage detection robot
CN113945628B (en) * 2021-11-09 2024-05-03 中国特种设备检测研究院 Magnetic field adjusting device and method for large storage tank wallboard magnetic flux leakage detection robot

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