JP2012042239A - Magnetization device for magnetic flaw detection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetization device by which even a person other than an operator of the magnetization device can watch an inspection part and the operator can easily and visually inspect the inspection part when a magnetic flaw detection inspection is performed.SOLUTION: Each of base end parts of connection arms 4, 4 is attached to each tip of contact parts 32, 32 of an electromagnet part 3. The tips of attachment arm parts 52, 52 of an imaging means attachment part 5 are attached, respectively, to each tip of the connection arms 4, 4. An imaging means 7 capable of photographing a part between contact parts 31, 31 is attached to an attachment part 51 of the imaging means attachment part 5. A space S is formed between a grip part 31 of the electromagnet part 3 and the attachment part 51 of the imaging means attachment part 5. The space S is made into the one by which the contact parts 32, 32 are visually inspected through the space.

Description

  The present invention relates to a magnetic flaw detection magnetizing apparatus used in a magnetic flaw inspection apparatus.

  Generally, this type of magnetizing apparatus includes an electromagnet portion as described in Patent Document 1 below. The electromagnet portion is composed of an iron core made of a ferromagnetic material such as a silicon steel plate, and an electromagnetic coil wound around the iron core. The iron core has a grip portion and a pair of contact portions that protrude in the same direction from both ends in the longitudinal direction of the grip portion. An electromagnetic coil is wound around at least one of the grip portion and the pair of contact portions. Therefore, the iron core is magnetized when a current is passed through the electromagnetic coil. And the front-end | tip part of a pair of contact part becomes a magnetic pole.

  When performing a magnetic flaw inspection using the magnetizing apparatus, the tip portions of the pair of contact portions are brought into contact with the inspection object. And the iron core is magnetized. Thereby, the portion located between the contact of the inspection object is magnetized. Next, fluorescent magnetic powder is sprayed on the magnetized portion, and further irradiated with ultraviolet rays. When there are defects such as cracks in the magnetized portion to be inspected, a lot of fluorescent magnetic powder adheres to the locations where the defects exist. As a result, the amount of fluorescence emitted from the defective portion is greater than that of the other portions. Thereby, it is found that the inspection object has a defect.

JP 2003-130849 A

  In the above conventional magnetizing apparatus, no imaging means such as a camera is provided. For this reason, there has been a problem that the inspection result can be recorded as an image, or a person other than the operator of the magnetizing apparatus cannot see the inspection portion.

  Therefore, the inventor of this application considered providing an imaging unit in the magnetizing device. However, if the image pickup means is attached to the magnetizing apparatus, the image pickup means obstructs the operator's field of view, making it difficult for the operator to see the inspection portion.

The present invention has been made to solve the above-described problem, and has a grip portion and a pair of contact portions extending in the same direction from both ends of the grip portion, and each tip of the pair of contact portions. An electromagnet part whose part is a magnetic pole, a mounting part disposed in parallel with the gripping part and at the same position as the gripping part in the longitudinal direction of the gripping part, and both ends of the mounting part in the same direction An imaging means mounting portion that has a pair of attachment arm portions that extend and each distal end portion is attached to the distal end portion of the pair of contact portions, and the pair of contact portions on the attachment portion of the imaging means attachment portion An imaging means attached in a state capable of imaging a range located between, and a gap is formed between the grip portion and the attachment portion, and a portion located between the pair of contact portions through the gap The above mounting so that you can see It is characterized in that the said grip portion is spaced apart from each other in a direction perpendicular to their longitudinal direction.
In this case, the proximal end portions of the pair of connecting arm portions are respectively attached to the distal end portions of the pair of contact portions, and the distal end portions of the pair of attachment arm portions are respectively attached to the longitudinal intermediate portions of the respective connecting arm portions. It is desirable that a light emitting means that is attached and capable of irradiating light between the pair of contact portions is provided at the tip of the pair of connecting arm portions.
The pair of attachment arm portions are attached to the pair of connection arm portions in such a manner that the position of the attachment portion can be adjusted so that the attachment portion can be moved closer to and away from the grip portion and thereby the size of the gap can be changed. It is desirable.
A contact plane parallel to the grip portion is formed at each tip of the pair of contact portions, and when the contact planes of the pair of contact portions are in surface contact with a horizontal plane, the grip portion and the attachment It is desirable that the contact plane be inclined with respect to the contact portion so that the portion is located on both sides of the contact plane with the gap in between.

  According to the present invention having the above-described characteristic configuration, since the imaging device is provided in the magnetizing device, it is possible to record an image taken by the imaging device, or to view the image on a monitor or the like, so that it is not an operator of the magnetizing device. Things can also see the inspection part. In addition, since a gap is formed between the grip portion of the electromagnet portion and the mounting portion of the imaging means mounting portion, the operator of the magnetizing apparatus can see the inspection portion through the gap.

FIG. 1 is a diagram showing a schematic configuration of an example of a magnetic flaw inspection apparatus using a magnetizing apparatus according to the present invention. FIG. 2 is a side view showing an embodiment of the magnetization apparatus according to the present invention, which is the magnetization apparatus used in the magnetic flaw inspection apparatus shown in FIG. 3 is a view taken in the direction of arrow X in FIG. 4 is a view taken in the direction of arrow Y in FIG. FIG. 5 is a view taken in the direction of arrow Z in FIG. FIG. 6 is a front view showing an electromagnet portion used in the embodiment. FIG. 7 is a side view showing the electromagnet portion. FIG. 8 is a front view showing a connecting arm portion used in the embodiment. FIG. 9 is a side view showing the connecting arm portion. FIG. 10 is a front view showing an imaging means mounting portion used in the embodiment. FIG. 11 is a plan view showing the imaging means mounting portion. FIG. 12 is a side view showing the imaging means mounting portion.

The best mode for carrying out the present invention will be described below with reference to FIGS.
FIG. 1 shows a schematic configuration of a magnetic flaw inspection apparatus 1, and the magnetic flaw inspection apparatus 1 includes a magnetizing device 2 according to the present invention and a control unit 10 for controlling the magnetizing device 2. Yes.

  First, the magnetizing device 2 will be described. The magnetizing device 2 includes an electromagnet unit 3, a connecting arm unit 4, an imaging unit mounting unit 5, a light emitting unit 6, and an imaging unit 7 as main components.

The electromagnet portion 3 has an iron core 3A made of a silicon steel plate or other ferromagnetic material. As shown in FIGS. 6 and 7, the iron core 3 </ b> A has a grip portion 31 that extends straight and a pair of contact portions 32 and 32 provided at both ends of the grip portion 31 in the longitudinal direction. . The gripping unit 31 is used by the operator of the magnetizing apparatus 2 to operate the entire magnetizing apparatus 2 by gripping it with one hand, and has a sufficient length for gripping with the hand. Moreover, the grip portion 31 is covered with a tape or other covering (not shown) so that the grip portion 31 can be easily held by hand.

The pair of contact portions 32, 32 extend in parallel with each other in the same direction from both ends of the grip portion 31. In particular, in this embodiment, the contact portion 33 is provided so as to be orthogonal to the grip portion 31. As a result, the entire electromagnet portion 3 is formed in a “U” shape. The abutting portions 32 and 32 are not necessarily orthogonal to the gripping portion 31, and the abutting portions 32 and 32 are arranged such that the distance between the abutting portions 32 and 32 increases toward the distal end side of the abutting portion 32. May cross the grip portion 31 with an obtuse angle.

An excitation coil (not shown) is wound around at least one of the grip portion 31 and the pair of contact portions 32 and 32. In this embodiment, the exciting coil is wound around the grip portion 31. The exciting coil is covered with the covering body together with the grip portion 31. When a current is passed through the exciting coil, the electromagnet portion 3 is magnetized, and both tip portions of the pair of contact portions 32, 32 become magnetic poles.

A contact flat surface 32 a is formed at each tip of the pair of contact portions 32, 32. The contact planes 32a and 32a are brought into contact with both end portions of the portion to be magnetized of the inspection target. Therefore, when a current is passed through the exciting coil, a portion (hereinafter referred to as a magnetized portion) located between the contact planes 32a and 32a in the inspection object is magnetized.

The two abutting planes 32 a and 32 a are arranged so as to be located on one plane parallel to the grip portion 31. In addition, when the two abutting planes 32a and 32a are brought into surface contact with one virtual plane, the abutting plane 32a is inclined so that the pair of abutting portions 32 and 32 are inclined at the same angle with respect to the virtual plane. The contact portion 33 is inclined with respect to the longitudinal direction. The inclination angle is normally set to about 30 ° to 60 °, but is set to about 45 ° in this embodiment. As a result of the contact plane 32a being inclined in this way, as shown in FIG. 2, when the two contact planes 32a and 32a are brought into surface contact with the virtual plane, the grip portion 31 is brought into contact with the contact plane 32a. In the direction orthogonal to the straight line connecting the two contact surfaces 32a, 32a, more specifically, in the direction perpendicular to the two contact surfaces 32a, 32a on the virtual plane (hereinafter referred to as the orthogonal direction). Here, the length of the contact portion 32 on a line connecting the center of the grip portion 31 in the width direction and the center of the contact plane 32a in the same direction is L, and the inclination of the contact portion 32 and the contact plane 32a is inclined. When the angle is α, the central portion in the width direction of the grip portion 31 is separated from the central portion of the contact plane 32a in the same direction by a distance D obtained by the following equation.
D = L ・ cosα

The connecting arm portion 4 is fixed to the distal end portion of the contact portion 32. The connecting arm portion 4 is made of a metal plate material, and includes a substrate portion 41 formed at a base end portion (a lower end portion in FIG. 2), and an inclined plate continuously provided at a distal end portion of the substrate portion 41. Part 42. The base end portion (lower end portion in FIG. 2) of the substrate portion 41 is interposed on the outer surface of the contact portion 32 (the surface facing the opposite surface of the contact portions 32, 32) with the interposition material 43. Attached. The substrate part 41 may be directly attached to the contact part 32. The substrate portion 41 is attached to the contact portion 32 in a state in which the substrate portion 41 is inclined in a direction opposite to the inclination direction of the contact portion 32 with respect to the contact plane 32a. As a result, the distal end portion of the substrate portion 41 and the proximal end portion of the contact portion 32 are located on the opposite side in the orthogonal direction with the contact plane 32a therebetween, and the distance between them is the contact plane. The distance gradually increases from 32a toward the proximal end side of the contact portion 32 or the distal end side (upper side in FIG. 2) of the substrate portion 41. The inclination angle of the substrate part 41 with respect to the contact plane 32a may be different from the inclination angle of the contact part 32 with respect to the contact plane 32a, but in this embodiment, it is set to the same angle.

The inclined plate portion 42 of the connecting arm portion 4 is inclined with respect to the substrate portion 41. That is, when the contact planes 32a and 32a are brought into surface contact with the virtual plane, the inner surface of the inclined plate portion 42 (the surface facing obliquely downward in FIGS. 3 and 4) is a pair of contact portions of the virtual plane. In this embodiment, the inclined plate portion 42 is opposed to the substrate portion 41 so as to face the portion located between 32 and 32, that is, the magnetized portion. Is inclined.

The light emitting means 6 is provided on the inner surface of the inclined plate portion 42. The light emitting means 6 includes an ultraviolet light emitting unit that emits ultraviolet light and a visible light emitting unit that emits visible light (both not shown). The ultraviolet light emitting part and the visible light emitting part irradiate the magnetized part with ultraviolet light or visible light. In this case, the ultraviolet light emitting unit and the visible light emitting unit may irradiate the entire magnetized portion substantially uniformly, and the central portion of the magnetized portion in the direction connecting the contact portions 32 and 32 is the strongest. Irradiation may be performed such that the irradiation amount decreases as the distance from the center portion increases. Moreover, the light emission means 6 should just have an ultraviolet light emission part at least, and a visible light emission part is not necessarily required.

The imaging means mounting portion 5 is made of a plate material having a flat plate shape, and is integrally formed with a mounting portion 51 having a rectangular shape in plan view (viewed in the Z direction in FIG. 2) and both ends in the longitudinal direction of the mounting portion 51. And a pair of mounting arm portions 52, 52. The attachment arm portions 52 and 52 extend from the attachment portion 51 in parallel to each other in the same direction, and have the same length. As a result, the entire imaging means mounting portion 5 has a “U” shape.

The attachment portion 51 is located on the same side as the grip portion 31 of the electromagnet portion 3 with respect to the contact plane 32 a and is disposed in parallel with the grip portion 31. In addition, the attachment portion 51 is positioned substantially at the same position as the grip portion 31 in the longitudinal direction. On the other hand, the attachment arm portion 52 is arranged in a state where its longitudinal direction is directed in a direction substantially perpendicular to the contact plane 32a. The distal end portion (lower end portion in FIG. 2) of the attachment arm portion 52 is attached to the distal end portion of the substrate portion 41 of the connecting arm portion 4. Since the attachment portion 51 and the attachment arm portion 52 are arranged as described above, and the distal end portion of the attachment arm portion 52 is attached to the distal end portion of the substrate portion 41, the attachment portion 51 and the grip portion 31 are bent. Are spaced apart from each other in a direction perpendicular to the longitudinal direction of the two. As a result, a gap S extending along the attachment portion 51 and the grip portion 31 is formed. here. Since the grip portion 31 and the attachment portion 51 are positioned on opposite sides of the contact plane 32a in the orthogonal direction, the gap S is positioned so as to face the contact plane 32a. .

A long hole 52 a extending in the substantially same direction as the longitudinal direction of the substrate portion 41 is formed at the distal end portion of the mounting arm portion 52. The bolt T inserted through the elongated hole 52a is screwed into the board portion 41 and tightened, whereby the mounting arm portion 52 is fixed to the board portion 41 and eventually the imaging means mounting portion 5 is fixed to the connecting arm portions 4 and 4. Has been. Therefore, by loosening the bolt T, the position of the imaging means mounting portion 5 can be adjusted in the longitudinal direction of the substrate portion 41 (longitudinal direction of the long hole 52a). When the imaging means mounting portion 5 is moved to the base end side of the substrate portion 41, the attachment portion 51 approaches the grip portion 31, and the width of the gap S between the attachment portion 51 and the grip portion 31 becomes narrow. On the other hand, when the imaging means mounting portion 5 is moved to the distal end side of the substrate portion 41, the attachment portion 51 is separated from the grip portion 31, and the width of the gap S between the attachment portion 51 and the grip portion 31 is increased.

The attachment arm portion 52 is attached to the substrate portion 41 so as to be rotatable by a predetermined angle about an axis extending in parallel with the attachment portion 51, instead of being attached so as to be adjustable in the direction of approaching and separating from the substrate portion 41. Also good. In such a case, the width of the gap S can be changed to be larger or smaller by rotating the attachment arm portion 52 in the forward / reverse direction with respect to the substrate portion 41.

The image pickup means 7 is attached to the attachment portion 51. As the imaging means 7, a CCD camera, an optical camera, or other known imaging means can be used. The imaging incident portion 71 of the imaging means 7 is inserted through a through hole 51a formed in the central portion of the attachment portion 51, and is arranged with its optical axis oriented in a direction orthogonal to the contact plane 32a. Yes. In addition, the incident portion 71 is disposed so as to be located at a substantially central portion of the attachment portion 51. That is, the incident portion 71 is disposed so as to be positioned at the center of the magnetized portion in the direction connecting the contact planes 31a and 31a. However, the incident portion 71 is disposed at a position slightly deviated from the contact plane 32a in the orthogonal direction. Of course, the incident portion 71 may be disposed so as to be positioned at the center of the contact plane 32a in the orthogonal direction. Alternatively, the incident portion 71 may be arranged such that the optical axis of the incident portion 71 is inclined with respect to the contact plane 32a and the optical axis of the incident portion 71 passes through the central portion of the magnetized portion in the orthogonal direction. In any case, the imaging means 7 can capture the entire magnetized portion. The optical axis direction of the incident portion 71 is adjusted by rotating the imaging means mounting portion 5 with respect to the substrate portion 41 when the attachment arm portion 52 is rotatably attached to the substrate portion 41. Can do.

Next, the control unit 10 will be described. The control unit 10 is based on input signals S1, S2, and S3 from switches SW1, SW2, and SW3 provided at one end in the longitudinal direction of the grip portion 31 of the magnetization apparatus 2. This is for controlling the magnetizing device 2, and includes a battery 11, a control circuit 12, a magnetization driving circuit 13, an illumination driving circuit 14, and an imaging driving circuit 15. The battery 11, the control circuit 12, the magnetization drive circuit 13, the illumination drive circuit 14, and the imaging drive circuit 15 are accommodated in one casing 16, thereby forming a unit. It is desirable that the casing 16 can be detachably attached to the operator of the magnetizing device 2. For example, it is desirable that it can be detachably attached to the operator's waist belt.

The battery 11 is connected to the exciting coil of the magnetizing device 2 via the magnetization driving circuit 13, connected to the light emitting means 6 via the illumination driving circuit 14, and connected to the imaging means 7 via the imaging driving circuit 15. Has been. As the battery 11, it is desirable to use a lithium battery from the viewpoint of light weight and a large amount of stored electricity.

In response to the input signals S1, S2, and S3 respectively input from the switches SW1, SW2, and SW3, the control circuit 12 sets the magnetization drive circuit 13, the illumination drive circuit 14, and the imaging drive circuit 15 as follows. Control.

That is, when the switch SW1 is turned off, the control circuit 12 disconnects between the magnetization drive circuit 13 and the excitation coil. On the other hand, when the switch SW1 is turned on, the control circuit 12 connects the magnetization drive circuit 13 and the excitation coil. In addition, the control circuit 12 adjusts the magnitude and frequency of the current flowing from the magnetization drive circuit 13 to the exciting coil in accordance with the operation amount and / or operation position of the switch SW1. Therefore, the operator can independently adjust the magnitude and frequency of the current flowing through the exciting coil by appropriately operating the switch SW1. Thereby, the strength of the magnetic force of the electromagnet part 3 and the conversion frequency of the magnetic polarity can be changed. Further, when the switch SW1 is switched to “demagnetization”, the control circuit 12 controls the magnetization drive circuit 13 so that the magnetization drive circuit 13 passes a demagnetization current to the excitation coil.

When the switch SW2 is turned off, the control circuit 12 disconnects between the lighting drive circuit 14 and the light emitting means 6. On the other hand, when the switch SW2 is turned on, the illumination drive circuit 14 and the light emitting means 6 are connected, and a light emission current is caused to flow from the illumination drive circuit 14 to the light emission means 6. In particular, in this embodiment, when the switch SW2 is set to the “first ON state”, the illumination drive circuit 14 and the ultraviolet light emitting part of the light emitting means 6 are connected, ultraviolet light is emitted from the ultraviolet light emitting part, and magnetization is performed. The part is irradiated. When the switch SW2 is set to the “second ON state”, the illumination drive circuit 14 and the visible light emitting unit are connected, visible light is emitted from the visible light emitting unit, and the magnetized portion is irradiated. Further, the switch SW2 can be switched between a continuous state and an intermittent state in the first ON state. When the switch SW2 is switched to the continuous state, ultraviolet rays are continuously emitted from the ultraviolet light emitting unit. UV light is emitted intermittently. Similarly, when the switch SW2 is switched to the continuous state in the second ON state, visible light is continuously emitted from the visible light emitting unit, and when the switch SW2 is switched to the intermittent state, visible light is intermittently emitted from the visible light emitting unit. The The period of ultraviolet light and visible light emitted intermittently is changed according to the operation amount of the switch SW2.

  When the switch SW3 is set to the “off” state, the control circuit 12 disconnects between the imaging drive circuit 15 and the imaging means 7. When the switch SW3 is turned on, the control circuit 12 connects between the imaging drive circuit 15 and the imaging means 7. As a result, the imaging means 7 images the magnetized portion. In addition, when the switch SW2 is in the intermittent state, the control circuit 12 switches the imaging means 7 between the photographing state and the non-photographing state in accordance with the emission cycle of ultraviolet rays or visible light. Of course, when the ultraviolet ray or visible light is emitted, the imaging means 7 is switched to the photographing state, and when the ultraviolet ray or visible light is not emitted, the imaging means 7 is switched to the non-photographing state. The imaging state and the non-imaging state of the imaging unit 7 are usually performed by a shutter (not shown) provided in the imaging unit 7. The image pickup means 7 is connected to a monitor (not shown), and an image taken by the image pickup means 7 can be viewed on the monitor. Furthermore, the imaging means 7 is connected to a recording medium (not shown), and the video imaged by the imaging means is recorded on the recording medium.

  When inspecting whether or not an inspection target such as a power generation turbine is defective by the magnetic flaw inspection apparatus 1 having the above-described configuration, the contact planes 32a and 32a of the electromagnet portion 3 are pressed against the inspection target. At this time, a gap S is formed between the grip portion 31 of the electromagnet portion 3 and the attachment portion 51 of the imaging means mounting portion 5 so that the gap S faces a portion between the contact planes 32a and 32a. Since it is located, it is possible to visually confirm whether or not a predetermined portion of the inspection object (hereinafter referred to as an inspection portion) is correctly positioned between the contact planes 32a and 32a. When the inspection portion is dark, the switch SW2 is operated so that visible light is continuously emitted from the visible light emitting portion of the light emitting means 4, and the inspection portion is irradiated with visible light. Thereby, the inspection portion can be clearly confirmed.

  Thereafter, the switch SW1 is operated to pass a magnetization current through the exciting coil of the electromagnet unit 2. As a result, the inspection portion is magnetized, and as a result, the inspection portion becomes a magnetization portion. Thereafter, fluorescent magnetic powder (not shown) is sprayed on the magnetized portion. The fluorescent magnetic powder is sprayed onto the magnetized portion by ejecting the fluorescent magnetic powder from a nozzle (not shown) of a spraying device provided independently of the magnetic flaw detection inspection apparatus 1. The nozzle of the spraying device may be provided in any one of the electromagnet portion 2, the connecting arm portion 4, and the light emitting means mounting portion 5. In that case, in order to prevent the fluorescent magnetic powder from adhering to the front surface of the light emitting means 6 and the front surface of the incident portion 71 of the imaging means 7, the fluorescent magnetic powder is ejected from the front surface of the light emitting means 6 and the imaging means 7. Opening and closing means such as a shutter that covers the front surface of the incident portion and opens the front surface of the light emitting means 6 and the front surface of the incident portion 71 of the imaging means 7 when the injection of the fluorescent magnetic powder is interrupted or terminated is attached to the light emitting means 6 and the imaging means 7 It is desirable to keep it.

  Next, the switch SW2 is operated to emit ultraviolet rays from the light emitting means 6 to irradiate the magnetized portion. At the same time, the switch SW3 is operated to activate the imaging means 7, and the magnetized portion is imaged. This video is displayed on the monitor. Therefore, a person other than the operator of the magnetizing apparatus 2 can see the magnetized portion on the monitor. When the magnetized portion is imaged by the imaging means 7, it is desirable to emit ultraviolet light intermittently. This is because the image by the imaging means becomes clearer in comparison with the case where ultraviolet rays are continuously emitted. The video is not only projected on the monitor but also recorded on a storage medium (not shown). Of course, the magnetized portion can also be visually observed through the gap S. In any case, whether or not there is a defect in the magnetized portion can be confirmed by the amount of fluorescence emitted from each portion of the magnetized portion. After confirming the presence / absence of a defect, the switch SW1 is operated to pass a demagnetizing current through the exciting coil of the electromagnet unit 2 to demagnetize the magnetized portion. Thereafter, the fluorescent magnetic powder is removed, and the magnetic flaw inspection at the inspection portion is completed. Of course, portions other than the inspection portion that has been inspected as described above can also be inspected in the same manner as described above.

  As described above, in the magnetizing device 2 of the present invention, the image pickup means mounting portion 5 is provided with the image pickup means 7, so that the operation of the magnetizer 2 can be operated by viewing the image taken by the image pickup means 7 on the monitor. Not only the person but also others can see the inspection part (magnetization part). Further, by recording the video, it is possible to confirm whether or not the inspection object has a defect and in which part of the inspection object the defect exists even after the inspection is completed.

Further, by looking at the inspection portion on the monitor before magnetizing the electromagnet portion 3 of this embodiment, it can be confirmed whether or not the electromagnet portion 2 is correctly set on the inspection portion. In particular, in this embodiment, since the light emitting means 6 is provided with not only the ultraviolet light emitting part but also the visible light emitting part, the electromagnet part 2 is correctly set on the inspection part by irradiating the inspection part with visible light. It can be confirmed more clearly whether or not it is done.

  Further, since a gap S is formed between the gripping part 31 of the electromagnet part 3 and the attachment part 51 of the imaging means mounting part 5, and the inspection part (magnetization part) can be visually observed from the gap S, the magnetizing device 2 The operator can easily confirm whether or not the electromagnet unit 2 is set at the correct position and the amount of fluorescence emitted from each part of the magnetized portion through the gap S.

In addition, this invention is not limited to said embodiment, Various modifications can be employ | adopted.
For example, in the above embodiment, the imaging means mounting portion 5 is attached to the electromagnet portion 3 via the connecting arm portion 4, but the connecting arm portion 4 is omitted and the mounting arm portion 52 of the imaging means mounting portion 5, 52 may be directly attached to the contact portions 32, 32 of the electromagnet portion 3, respectively. In this case, the attachment arm portion 52 can be moved with respect to the abutment portion 32 so that the attachment portion 51 of the imaging means attachment portion 5 can be adjusted in a direction in which the attachment portion 51 approaches and separates from the grip portion 31 of the electromagnet portion 3. Or, it is desirable to attach it so that rotation is possible.

  The magnetizing apparatus according to the present invention can be used for magnetizing an inspection portion of an inspection object in a magnetic flaw inspection.

S gap 2 magnetizing device 3 electromagnet part 4 connecting arm part 5 imaging means mounting part 6 light emitting means 7 imaging means 31 gripping part 32 abutting part 32a abutting plane 51 attaching part 52 attaching arm part

Claims (4)

  An electromagnet part having a grip part and a pair of contact parts extending in the same direction from both ends of the grip part, each tip of the pair of contact parts being a magnetic pole, and parallel to the grip part And the mounting portion arranged at the same position as the gripping portion in the longitudinal direction of the gripping portion, and extending from the both ends of the mounting portion in the same direction, each tip portion being the tip portion of the pair of contact portions An image pickup means mounting portion having a pair of attachment arm portions attached to the image pickup means, and an image pickup means attached to the attachment portion of the image pickup means attachment portion so as to be able to image a range located between the pair of contact portions. A gap is formed between the gripping portion and the attachment portion, and the attachment portion and the gripping portion can be visually observed through the gap between the pair of contact portions. In the direction perpendicular to their longitudinal direction. Magnetic flaw detection magnetizing apparatus characterized by being arranged separately.   The proximal end portions of the pair of connecting arm portions are respectively attached to the distal end portions of the pair of contact portions, and the distal end portions of the pair of attachment arm portions are respectively attached to intermediate portions in the longitudinal direction of the connecting arm portions, 2. The magnetizing device for magnetic flaw detection according to claim 1, wherein light emitting means capable of irradiating light is provided between the pair of abutting portions at the distal end portions of the pair of connecting arm portions.   The pair of attachment arm portions are attached to the pair of connection arm portions in such a manner that the position of the attachment portion can be adjusted so that the attachment portion can be moved closer to and away from the grip portion and thereby the size of the gap can be changed. The magnetizing device for magnetic flaw detection according to claim 2.   A contact plane parallel to the grip portion is formed at each tip of the pair of contact portions, and when the contact planes of the pair of contact portions are in surface contact with a horizontal plane, the grip portion and the attachment The contact plane is inclined with respect to the contact portion so that the portion is located on both sides of the contact plane with the gap in between. Magnetization apparatus for magnetic flaw detection as described in 1.

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