JP2017211309A - Flaw detecting magnetization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flaw detecting magnetization device which has an excellent operability for a flaw detection work and can prevent overheat of a magnetic pole part at flaw detection.SOLUTION: The magnetization device includes: a magnetic pole part formed to magnetize a flaw region; a black light formed to receive power from an external power source and irradiate the flaw region with a predetermined ultraviolet ray; and a heat discharge shape part formed to discharge heat generating from the black light; and an illumination unit formed to be attached to the magnetic pole part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetizing apparatus, and more particularly to a magnetizing apparatus for flaw detection, and more particularly to a magnetizing apparatus for flaw detection.

  In a magnetic particle flaw detection, generally, a magnetizer that magnetizes the flaw detection range, and a flaw detection region that is separate from the magnetizer and is magnetized and sprayed with the fluorescent magnetic powder are irradiated with predetermined ultraviolet rays that comply with the laws and regulations. A black light that fluoresces fluorescent magnetic powder that is magnetically adsorbed on the surface is used.

  Patent Document 1 proposes a magnetizer in which a black light is integrated. The magnetizer of Patent Document 1 has a magnetizing coil (primary coil) that magnetizes the flaw detection range, and a secondary coil that is electrically insulated from the magnetizing coil and electrically connected to the black light. At the time of flaw detection, if a magnetizing current (primary current) is supplied to the magnetizing coil, an induced current is generated in the secondary coil, and this dielectric current is supplied to the black light to cause the black light to emit light.

JP 2010-117340 A (see paragraph 0036, FIG. 6 and FIG. 7)

  The following analysis is in accordance with the present invention. When the magnetizer and the black light are separate, the magnetometer is scanned with one hand, and the flaw detection is performed while holding the black light with the other hand. Therefore, there is a problem in the operability of the magnetizer and the black light particularly in a narrow environment.

  According to the magnetizer of Patent Document 1, the black light emits light by an induced current induced from the magnetizing current to the magnetizing coil. Therefore, since the black light (ultraviolet LED) is turned on only while the magnetization (energization of the magnetization coil) is performed, there is a problem in that the flaw cannot be confirmed after the magnetization. Magnetizer manufacturers also recommend avoiding continuous magnetization (continuous energization of the magnetizing coil) to prevent heating of the magnetizing coil. Therefore, in an actual measurement site, usually, after performing magnetization (energization) for 3 to 4 seconds, observation using a black light is performed. However, when the magnetizer of Patent Document 1 is applied to an actual measurement site, it is necessary to energize the magnetizing coil continuously for a long time in order to achieve both the purposes of magnetization and ultraviolet illumination. This may cause a problem of overheating of the magnetic pole part or the magnetizer.

  Accordingly, there is a need for a flaw detection magnetizing apparatus that has good operability in flaw detection work and can prevent overheating of the magnetic pole part during flaw detection.

In a first aspect, the magnetizing device comprises the following elements:
-Magnetic pole part that magnetizes the flaw detection area;
-An illumination unit configured to be mounted on a magnetic pole;
A black light included in the illumination unit and configured to irradiate the flaw detection area with predetermined ultraviolet rays (for example, A-region ultraviolet rays conforming to JIS Z2323) supplied from an external power source;
-A heat-dissipating shape part included in the lighting unit and configured to dissipate the heat generated from the black light.

It is a figure which illustrates typically the composition of the magnetization device concerning one example. It is a perspective view which shows typically the unit for illumination which concerns on one Example. In the magnetization apparatus which concerns on one Example, it is a schematic diagram which shows the example of mounting | wearing of the unit for illumination with respect to two magnetization apparatuses (magnetizer) from which size differs.

From the above viewpoints, the following preferable modes are possible.
(Form 1) Form 1 is as in the first viewpoint. According to the magnetizing apparatus of aspect 1, since the illumination unit equipped with the black light is attached to the magnetizing apparatus (magnetizer), one hand is freed, and the operability of the flaw detection work is good. In addition, since the black light is supplied from an external power source, such as a commercial power source or a battery, the illuminance conditions stipulated by laws and regulations can be reliably achieved without being affected by the timing of magnetization or the strength of magnetization. The overheating of the magnetic pole part at the time can also be prevented.

(Mode 2) Preferably, the magnetic pole part includes at least one columnar magnetic pole part. Preferably, the illumination unit includes an opening through which the columnar magnetic pole portion is inserted and an annular portion surrounding the opening so as to be covered on the outer peripheral surface of the columnar magnetic pole portion. In this way, the illumination unit can be attached using the empty space of the magnetizing device (magnetizer).

(Mode 3) Preferably, the magnetic pole portion engages the illumination unit guided toward the mounting position by the guide surface and the guide surface configured to slidably guide the illumination unit. And a locking surface formed to be inclined with respect to the guide surface. Preferably, the illumination unit is formed to be inclined with respect to the sliding surface configured to be slidable with the guide surface and the locking surface, and is in contact with the locking surface at the mounting position. A locked surface configured to be locked. According to this embodiment, the guide unit and the sliding surface make it easy to attach the illumination unit to the magnetizing device (magnetizer). In addition, since a clearance is formed between the locking surface and the locked surface having different angles, the lighting unit can be moved to the mounting position without being interrupted by the locking surface when the lighting unit is mounted. . Further, according to this embodiment, it is possible to cope with various magnetizing devices (magnetizers) having different sizes in one lighting unit, in particular, various magnetizing devices (magnetizers) having different magnetic pole part thicknesses.

(Mode 4) Preferably, the columnar magnetic pole portion includes the guide surface on one side of the outer peripheral surface and the locking surface on the other side. The illumination unit includes the sliding surface on one side of the inner peripheral surface of the annular portion and the locked surface on the other side. In this embodiment, various components are arranged in the inner part that does not affect the illumination of the illumination unit.

(Mode 5) Preferably, the magnetizing device has a fastener including an intermediate portion extending so as to straddle the columnar magnetic pole portion and both end portions engageable with the illumination unit. By using such a fastener, the illumination unit can be firmly fixed to the magnetizing device regardless of the size or shape of the magnetizing device (magnetizer).

(Mode 6) Preferably, the heat radiation shape portion includes at least one slit formed in a body of the illumination unit. By such passive heat radiation means, it is possible to improve the heat radiation performance without enlarging the illumination unit and to improve the reliability of the black light illumination.

(Mode 7) Preferably, the illumination unit further includes a general illumination light. Since the heat dissipation of the lighting unit is improved, a plurality or types of lights can be mounted on the lighting unit.

  In one embodiment, a power stabilization circuit is mounted on at least an external power source that supplies power to the illumination unit, and a plurality of lights and a switching circuit that switches power supply to the plurality of lights are mounted on the illumination unit.

  In one form, the external power source is a commercial power source or a battery. The external power supply feeds direct current or alternating current to the magnetizing device (magnetizer), and the magnetizing device magnetizes the flaw detection range in direct current or alternating current.

  In one form, the illumination unit has a shape with an increased surface area, a shape that communicates the inside and outside of the illumination unit, or the like, as a heat radiation shape portion formed on the body. The heat radiation shape portion preferably includes one or more of a slit, a through hole or a blind hole, and an uneven portion. In some cases, a high thermal conductivity element or a forced cooling device may be mounted on the lighting unit.

  In one form, the illumination unit is removably secured to the magnetizing device (magnetizer) by mechanical means. Examples of mechanical means include a fastener such as a rubber band or a wire, a fitting structure using claws, a locking structure using spring force, a mooring structure using fasteners, and the like.

  Hereinafter, an embodiment based on the present disclosure will be further described. In addition, this invention is not limited to the above form and the following Examples, Other forms etc. can be implemented and it can also implement combining various forms.

  Hereinafter, an embodiment will be described with reference to the accompanying drawings.

  With reference to FIG. 1, a basic configuration of a magnetizing apparatus 10 according to an embodiment will be described. The magnetizing apparatus (magnetizer) 10 has a magnetic pole part 10a for magnetizing the flaw detection area and an illumination unit 30 attached to the magnetic pole part. The illumination unit 30 is configured to irradiate the flaw detection region BL with A region ultraviolet rays (wavelength 315 to 400 nm) having a nominal maximum intensity in the vicinity of a wavelength of 365 nm conforming to JIS Z2323 by being fed from the external power supply 20. Is provided. Preferably, an LED having a narrow center wavelength of 365 nm and a wavelength spread of 365 nm ± 10 nm is used as the black light 31. Such an LED has an advantage that a flaw indication pattern can be observed sharply. The illumination unit 30 further includes a heat radiation shape portion 33 configured to radiate heat generated from the black light 31.

  According to the magnetizing apparatus 10, since the black light 31 is mounted on or integrated with the magnetic pole portion 10a, magnetization of the flaw detection range BL and black light irradiation can be executed with one hand. Therefore, the flaw detection work is easy even in narrow spaces. Since the black light 31 is reliably supplied with power from the external power source 20, the irradiance necessary for flaw detection can be reliably obtained without being influenced by the energization timing to the magnetic pole part 10a or the strength of the magnetizing current. Further, since it is not necessary to supply power to the magnetic pole part 10a in order to turn on the black light 31, overheating of the magnetic pole part 10a can be prevented. Even when flaw detection is continued, the temperature of the illumination unit 30 is not affected by the provision of the heat radiation shape portion 33 so that the inspection engineer holding the magnetizing device (magnetizer) 10 is not affected. Can be suppressed. Due to the improvement of heat dissipation by the heat dissipation shape portion 33, the lighting unit 30 can be made of a resin that is hardly affected by the magnetic field but has a relatively low thermal conductivity.

  With reference to FIG. 1 again, the magnetizing system 1 including the magnetizing device 10 and the external power supply 20 that supplies power to the magnetizing device 10 will be described in detail.

  The magnetizing apparatus (interpole magnetizer) 10 includes a pair of columnar magnetic pole portions 10a and 10a and a grip portion 10b that connects the pair of columnar magnetic pole portions 10a and 10a. A magnetizing coil 10c is wound around each columnar magnetic pole portion 10a. In FIG. 1, for convenience of illustration, the magnetizing coil 10c is illustrated on the outer peripheral surface of the columnar magnetic pole portion 10a. However, the magnetizing coil 10c is usually built in the columnar magnetic pole portion 10a for insulation. The pair of columnar magnetic pole portions 10a and 10a is supplied with power from the external power source 20 via the magnetization power supply cable 20a. Normally, a switch (not shown) for turning on / off the energization of the magnetizing coils 10c, 10c is installed in the grip portion 10b.

  The illumination unit 30 is detachably mounted on the outer peripheral surface of one columnar magnetic pole portion 10a. The illumination unit 30 is supplied with power from the external power supply 20 via the illumination power supply cable 20b. In particular, referring to FIG. 2, the illumination unit 30 includes an opening 30b through which the columnar magnetic pole portion 10a is inserted and an annular portion 30a surrounding the opening 30b. On the outer peripheral surface of the annular portion 30a, the black light 31 and the general illumination light 32 are mounted on the surface facing the flaw detection region BL when the illumination unit 30 is attached to the columnar magnetic pole portion 10a.

  Furthermore, a plurality of slits 33 are formed in the annular portion 30a as the heat radiation shape portion. The formation positions and areas of the plurality of slits 33 can be set according to the degree of heat generation of the black light 31. FIG. 1 exemplifies a form in which a plurality of slits 33 are formed on the left and right side surfaces with respect to the mounting surface of the black light 31, and FIG. Is illustrated.

  In particular, referring to FIG. 2, the illumination unit 30 further includes a fastener (for example, a flexible band member, more specifically a rubber band) for fixing the illumination unit 30 to the magnetizing device (magnetizer) 10. 40. The fastener 40 includes an intermediate portion that extends over the upper surface of the columnar magnetic pole portion 10a, and both end portions that can be locked to the illumination unit. By using such a fastener 40, the illumination unit can be fixed to the magnetizing device 10 regardless of the size or shape of the magnetizing device. The fastener (rubber band) 40 is provided with a plurality of locking holes 40 a and can be engaged with locking protrusions 40 b provided on the outer side of the illumination unit 30. Thus, the illumination unit 30 can be easily attached to and detached from the magnetizing devices (magnetizers) 10-1 and 10-2 (see FIG. 3) having different dimensions. The fastener 40 is not limited to the rubber band type, and may be a mechanism that can be fixed to the magnetizers 10-1 and 10-2 having different dimensions as required.

  In particular, with reference to FIG. 3, a configuration for making one illumination unit 30 correspond to a plurality of magnetizing devices (magnetizers) 10-1 and 10-2 having different sizes will be described. FIG. 3 shows the magnetizing device 10-1 having a thick columnar magnetic pole portion 10a (a part thereof is indicated by hatching) and the thick magnetizing device 10-2 having a thin columnar magnetic pole portion 10a (shown by an imaginary line). .

  In the magnetizing apparatus 10-1, the columnar magnetic pole portion 10a has a guide surface 10aa for slidably guiding the illumination unit 30 on its outer peripheral surface, and a mounting position (an upper portion of the columnar magnetic pole portion 10a or an illumination unit) by the guide surface 10aa. The locking surface 10ab is formed so as to be inclined with respect to the guide surface 10aa so as to lock the illumination unit 30 guided toward the grip 30b. The small magnetizing device 10-2 has the same configuration as the large magnetizing device 10-1, but the profile of the locking surface (10ab) of the small magnetizing device 10-2 is that of the locking surface 10ab of the large magnetizing device 10-1. It is different from the profile.

  The illumination unit 30 is formed on the inner wall surface of the annular portion 30a so as to be inclined with respect to the guide surface 10aa of the columnar magnetic pole portion 10a and the slidable sliding surface 30aa and the locking surface 10ab of the columnar magnetic pole portion 10a. And a locked surface 30ab that is locked in contact with the locking surface 10ab at the mounting position. The line of intersection between the locked surface 30ab and the locking surface 10ab of the large magnetizing device 10-1 and the line of intersection between the locked surface 30ab and the locking surface (10ab) of the small magnetizing device 10-2 are common. . When the locked surface 30ab reaches the common intersection line, the illumination unit 30 is locked to the locking surfaces 10ab and (10ab). Further, since a clearance is formed between the locking surfaces 10ab, (10ab) and the locked surface 30ab having different angles, the locking surfaces 10ab, (10ab) are not obstructed when the lighting unit 30 is mounted. The illumination unit 30 can be moved to a mounting position (a common intersection line). Further, as shown in FIG. 3, the same is applied to various magnetizing devices 10-1 and 10-2 having different sizes, particularly to various magnetizing devices 10-1 and 10-2 having different thicknesses of the columnar magnetic pole portions 10a. The lighting unit 30 can be applied.

  With reference to FIG. 1, an example of a magnetic particle flaw test by a technical tester using the magnetizing apparatus 10 will be described. The illumination unit 30 is attached to the magnetic pole part 10 a of the magnetizing device (magnetizer) 10. The technical tester connects the magnetizing coil 10c to the external power source 20 through the magnetizing power supply cable 20a. The technical tester connects the illumination unit 30 to the external power supply 20 via the illumination power supply cable 20b. The technical tester operates the magnetizing apparatus 10 with one hand and places it so as to straddle the flaw detection area BL in the vicinity of the flaw detection area BL. The technical tester turns on the general illumination light 32 mounted on the illumination unit 30 and confirms the installation in the flaw detection area BL. The technical tester turns on the power supply to the magnetizing coil 10c, spreads the magnetic powder, and turns on the power supply to the black light 31 mounted on the illumination unit 30 separately from the power supply to the magnetizing coil 10c. When the flaw detection area BL has a defect such as a crack, the magnetic powder is magnetically attracted to the defective portion. When the adsorbed magnetic powder is irradiated with predetermined ultraviolet rays from the black light 31, the magnetic powder is fluorescently colored, thereby clearly presenting the defective portion.

  When the illumination unit 30 on which the black light 31 is mounted is mounted on the magnetizing devices 10-1 and 10-2 shown in FIG. 3 and the black light 31 is supplied from the external power source 20, a pair of columnar magnetic poles is obtained. Illuminance satisfying the regulations was measured between the parts 10a and 10a. Furthermore, when the flaw detection simulation test was conducted, flaw indication patterns appeared clearly.

  As mentioned above, although embodiment and the Example of this invention were described, this invention is not limited to above-described embodiment etc., and is a further deformation | transformation in the range which does not deviate from the fundamental technical idea of this invention. Substitutions or adjustments can be made.

  It should be noted that the disclosures of the above patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Also, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) within the scope of the entire disclosure of the present invention. Is possible. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea. Further, the numerical range and the upper limit or lower limit numerical value described in the present application are not limited to the numerical value or numerical range described, and any small range or arbitrary intermediate value is described, unless otherwise specified. Shall be considered.

  The apparatus and method according to the present disclosure are suitably applied to inspection of surface and surface conditions, grasping the state of an inspection object through the inspection, for example, inspection of material deterioration of pipes or turbine-related parts, flaw detection, etc. It can also be applied to applications that require magnetization and illumination. The apparatus and method according to the present disclosure contributes to labor saving in flaw detection and portability of the apparatus.

DESCRIPTION OF SYMBOLS 1 Magnetization system 10 Magnetizer, magnetizer 10-1 Large magnetizer (magnetizer)
10-2 Small magnetizing device (magnetizer)
10a Magnetic pole portion, columnar magnetic pole portion 10aa Guide surface 10ab Locking surface 10b Grip portion 10c Magnetizing coil 20 External power source, outlet, battery 20a Magnetizing power supply cable 20b Lighting power supply cable 30 Lighting unit 30a Annular portion 30aa Sliding surface 30ab Covered Locking surface 30b Opening 31 Black light 32 General illumination light 33 Heat radiation shape part, slit 40 Fastener, rubber band 40a Locking hole 40b Locking protrusion BL Testing area

Claims (7)

A magnetic pole portion configured to magnetize the flaw detection region;
A black light configured to irradiate the flaw detection area with a predetermined ultraviolet ray supplied with power from an external power source, and a heat radiating shape configured to radiate heat generated from the black light are mounted on the magnetic pole unit. A lighting unit configured to:
A magnetizing device comprising: The magnetic pole portion includes at least one columnar magnetic pole portion;
The illumination unit includes an opening through which the columnar magnetic pole portion is inserted and an annular portion surrounding the opening so as to be covered on the outer peripheral surface of the columnar magnetic pole portion;
The magnetizing apparatus according to claim 1. The magnetic pole portion is configured to guide the illumination unit slidably with respect to the guide surface and to engage the illumination unit guided toward the mounting position by the guide surface. A locking surface that is inclined and formed,
The illumination unit is formed to be inclined with respect to the sliding surface configured to be slidable with the guide surface and the locking surface, and is brought into contact with and locked to the locking surface at the mounting position. Having a locked surface configured to,
The magnetizing apparatus according to claim 1, wherein: The columnar magnetic pole portion includes the guide surface on one side of the outer peripheral surface and the locking surface on the other side,
The lighting unit includes the sliding surface on one side of the inner peripheral surface of the annular portion, and the locked surface on the other side.
The magnetizing apparatus according to claim 1, wherein:   Furthermore, it has a fastener containing the intermediate part extended so that it may straddle the said columnar magnetic pole part, and the both ends which can be latched to the said unit for illumination, The magnetization as described in any one of Claims 1-4 characterized by the above-mentioned. apparatus.   The magnetizing device according to claim 1, wherein the heat radiation shape portion includes at least one slit formed in a body of the illumination unit.   The magnetizing apparatus according to claim 1, wherein the illumination unit further includes a general illumination light.

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