JP5113665B2 - Eddy current flaw detection sensor jig and eddy current flaw detection sensor - Google Patents

Description

  The present invention relates to a jig for an eddy current flaw detection sensor and an eddy current flaw detection sensor. More specifically, the present invention relates to a linear or tubular inspection installed in the air such as an aluminum pipe for a power transmission line, a messenger wire installed between power poles, and an optical fiber composite aerial ground wire (also called OPGW). The present invention relates to a jig used by being attached to an eddy current flaw sensor to improve measurement accuracy when quantitatively detecting the deterioration state of an object by eddy current flaw detection, and an eddy current flaw sensor equipped with the jig.

  As a conventional eddy current flaw detection sensor for detecting damage of a magnetic member in a linear or tubular inspection object having a magnetic member by using eddy current due to electromagnetic induction, for example, as shown in FIG. Are provided with a sensor coil 101 and a cylindrical coil bobbin 102 around which the sensor coil 101 is wound, and a tubular inspection object (specifically, a steel wire bundle) 104 is installed in the through hole 103 of the coil bobbin 102. In some cases, damage to a magnetic member (specifically, a steel wire) 105 of the inspection object 104 is detected (Patent Document 1).

JP 2004-333330 A

  However, the eddy current flaw sensor disclosed in Patent Document 1 performs measurement by passing the inspection object 104 through the through hole 103 of the coil bobbin 102 around which the sensor coil 101 is wound (FIG. 8A). While the damage detection error is small when 104 is located at the center of the through hole 103, noise is generated and the detection error is large when the inspection object 104 is greatly displaced from the center of the through hole 103. It is difficult to say that the detection of damage is highly reliable. In particular, when the outer diameter of the inspection object 104 is extremely small compared to the diameter of the through-hole 103 of the coil bobbin 102, the inspection object 104 is greatly displaced from the center of the through-hole 103 (FIG. 8B), and noise is generated. This causes a problem that the reliability of damage detection is lowered.

  That is, in order to quantitatively and accurately detect the deterioration state due to corrosion of the inspection object, it is necessary that the inspection object is always positioned at a predetermined position in the eddy current flaw detection sensor. If the inspection object is not positioned, the signal strength (ie, voltage) obtained changes, and a signal change due to the detection of damage in the inspection object and a signal change due to a difference in the position of the inspection object in the sensor are mixed. However, there arises a problem that the deterioration state of the inspection object cannot be detected quantitatively and accurately.

  Further, generally, when the diameter of the eddy current flaw detection coil changes, the output signal (that is, the voltage) obtained even if the inspection object has the same outer diameter is different. Various calibration curves for estimating the degradation amount of the inspection object from the output signal must be prepared. For this reason, there is a problem that the use of coils having different diameters depending on measurement conditions or the like leads to an increase in labor for measurement.

  Therefore, the present invention uses a single sensor in which the diameter of the coil for eddy current flaw detection does not change, can cope with various outer diameters of the inspection object, and can quantitatively detect the deterioration state. An object of the present invention is to provide an eddy current flaw detection sensor jig and an eddy current flaw detection sensor that can be performed with high accuracy and can reduce the time and effort required for measurement.

In order to achieve this object, the eddy current flaw detection sensor jig according to claim 1 is formed of a non-conductive material and has a cylindrical bobbin having a through hole and an annular eddy current wound around the bobbin. A body portion fitted into a through hole of a bobbin of an eddy current flaw detection sensor having at least a coil for flaw detection, and an outer diameter larger than the diameter of the through hole of the bobbin, and fixed and having a flange portion provided on at least a part, the position of the axis test object inspection object to the center position of the eddy current coils are formed in a width larger than the outer diameter of the position of the body portion and a central axial position of the U-shaped groove and the body portion for slidably holding is formed as the vertex so as to provide an inspection object position fixing recess comprising a notch portion of the fan-shaped cross section which communicates with the U-shaped groove while Yes.

The eddy current flaw detection sensor according to claim 2 has a cylindrical bobbin having a through hole and an annular eddy current flaw detection coil wound around the bobbin, and further, in the through hole of the bobbin, A main body formed of a non-conductive material and fitted in the through hole of the bobbin, and formed on an outer diameter larger than the diameter of the through hole of the bobbin, and provided on at least a part of the peripheral edge of each axial side end of the main body And is formed at a position larger than the outer diameter of the inspection object at the axial position of the main body, and can be slid while fixing the position of the inspection object at the center position of the eddy current flaw detection coil. A jig provided with a U-shaped groove to be held and an inspection object position fixing concave portion formed of a notch portion having a fan-shaped cross section that is formed with the axial center position of the main body portion as a vertex and communicates with the U-shaped groove is provided. ing.

Therefore, according to the eddy current flaw detection sensor jig and the eddy current flaw detection sensor, the object to be inspected is slid to the axial center position of the jig main body portion fitted in the through-hole of the bobbin around which the eddy current flaw detection coil is wound. Since an inspection object position fixing recess having a U-shaped groove as a bottom portion that can be held is provided, the inspection object is fitted into the recess that is the central groove of the jig for the eddy current flaw detection sensor. The position of the object is fixed at the center position of the eddy current flaw detection coil.

Further,請 Motomeko 1 eddy current sensor jig description, the inspection object position fixing recess is set to be from the notch portion of the fan-shaped cross section which communicates with the U-shaped groove and the U-shaped groove. In this case, even if the overhead wire or the like that is the inspection object is partially thick due to the presence of a connection portion or an accessory, the inspection object is removed from the U-shaped groove that is the bottom of the inspection object position fixing recess. Once removed, the thickened portion of the inspection object can be passed using the cutout portion of the fan-shaped cross section that is wider than the U- shaped groove that is the bottom of the inspection object position fixing recess.

Moreover, eddy current sensors 請 Motomeko second aspect, the inspection object position fixing recess of the jig is made to be from the notch portion of the fan-shaped cross section which communicates with the U-shaped groove and the U-shaped groove. In this case, even if the overhead wire or the like that is the inspection object is partially thick due to the presence of a connection portion or an accessory, the inspection object is removed from the U-shaped groove that is the bottom of the inspection object position fixing recess. Once removed, the thickened portion of the inspection object can be passed using the cutout portion of the fan-shaped cross section that is wider than the U- shaped groove that is the bottom of the inspection object position fixing recess.

  According to the eddy current flaw detection sensor jig and the eddy current flaw detection sensor of the present invention, since the position of the inspection object is always fixed to the center position of the eddy current flaw detection coil, the inspection object is corroded. It is possible to detect the deterioration state due to the above quantitatively with high accuracy, and it is possible to improve the reliability of damage detection.

  Further, according to the present invention, it is not necessary to prepare a large number of sensors in which the diameter of the bobbin around which the coil for eddy current testing is wound is changed according to the outer diameter of the inspection object, and the outer diameter of the inspection object varies. Even in such a case, it is possible to quantitatively detect the deterioration state of the inspection object using a single eddy current flaw detection sensor. That is, even if the inspection object has various outer diameters, it is only necessary to prepare a plurality of jigs that fit into the through-holes of the bobbin, so that the cost of sensor production can be suppressed.

  Furthermore, according to the present invention, measurement can be performed by a single eddy current flaw detection sensor even when the outer diameter of the inspection object is varied, and the diameter of the coil can be obtained even when the outer diameter of the inspection object is varied. Therefore, only one calibration curve is required for estimating the amount of deterioration of the inspection object from the output signal, and the cost and labor of creating the calibration curve can be suppressed.

Further, according to the present invention, even if the inspection object is partially thick, the inspection object is temporarily removed from the U-shaped groove that is the bottom of the inspection object position fixing recess, and the bottom of the inspection object position fixing recess Since the thickened part of the inspection object can be passed using the cutout part of the fan-shaped cross section which is wider than the U- shaped groove , it is wound around and attached to the inspection object It is not necessary to remove the bobbin or coil of the eddy current flaw detection sensor every time the thickened portion of the inspection object is passed, and the labor of measurement can be reduced.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  1 to 7 show an example of an embodiment of an eddy current flaw detection sensor jig and an eddy current flaw detection sensor according to the present invention.

  The eddy current flaw detection sensor 2 includes a cylindrical bobbin 3 having a through hole 3 a and an eddy current flaw detection coil 4 wound around the bobbin 3. Further, the eddy current flaw detection sensor 2 is provided in the through hole 3 a of the bobbin 3. A sensor jig 1 is provided.

  The eddy current flaw detection sensor jig 1 is formed of a non-conductive material, and is larger than the diameter of the main body 1a fitted in the through hole 3a of the bobbin 3 of the eddy current flaw detection sensor 2 and the through hole 3a of the bobbin 3. A flange portion 1c formed at a large outer diameter and provided at the peripheral edge of both end portions in the axial direction of the main body portion 1a, and a portion that holds the object to be slidable at the axial center position of the main body portion 1a. The inspection object position fixing recess 1d is provided.

  The eddy current flaw detection sensor jig 1 of the present invention is formed of a non-conductive material such as a synthetic resin such as polyacetal.

  Further, the eddy current flaw detection sensor jig 1 of the present embodiment has a disk corresponding to the flange portion 1c attached to both ends in the axial direction of the cylinder corresponding to the main body portion 1a, and an axial direction between the cylinder and the disks at both ends. Formed into a shape with a U-shaped groove that is a part that holds the object to be slidably held at the axial position of the cylinder while cutting out a section having a sector shape with the axial center position of the cylinder as the apex. Is done.

  As a result, in this embodiment, the U-shaped groove and the cutout portion of the fan-shaped cross section constitute the inspection object position fixing recess 1d, and the U-shaped groove corresponds to the bottom 1b of the inspection object position fixing recess 1d. . Moreover, the flange part 1c is formed in the periphery of the axial direction both ends of the main-body part 1a.

  Moreover, in this embodiment, the width | variety of the opening part of the test object position fixed recessed part 1d is wider than the width | variety of the bottom part 1b (namely, width | variety of a U-shaped groove | channel) by the above-mentioned structure.

  The outer diameter of the main body 1a is adjusted to be slightly smaller than the diameter of the through hole 3a of the bobbin 3 of the eddy current flaw detection sensor 2 to which the eddy current flaw detection sensor jig 1 is attached.

  The size (specifically, the width of the U-shaped groove) of the bottom 1b of the inspection object position fixing recess 1d is adjusted to be slightly larger than the outer diameter of the linear / tubular inspection object.

  The through-holes 1e (three in the present embodiment) provided around the bottom 1b reduce the weight of the eddy current flaw sensor jig 1, and at the time of measurement with an aerial overhead wire, the eddy current flaw sensor 2 It is provided for passing a hanging strap for preventing falling to the ground when attaching and detaching, and the number and size of the through-holes 1e can be adjusted as appropriate and may not be provided in some cases. May be.

  The eddy current flaw detection sensor 2 according to the present embodiment mainly includes a bobbin 3, an eddy current flaw detection coil 4, and a connection terminal fixing member 5.

  The bobbin 3 is formed in a cylindrical shape having a through hole 3a. The bobbin 3 is formed of a nonconductive material such as a synthetic resin such as polyacetal. Further, the bobbin 3 has an annular groove 3c that makes one turn in the circumferential direction on the peripheral wall near the center in the axial direction. And the flange part 3b is formed in the both sides of the groove | channel 3c of the bobbin 3, ie, the axial direction both sides edge part of the bobbin 3. As shown in FIG.

  The bobbin 3 is divided into two in the axial direction by a plane passing through the axial center, and is configured to be mounted with the inspection object sandwiched in the through hole 3a.

  For this reason, the hinge 3d is provided in each of the flange portions 3b on both axial sides of the bobbin 3, and the two divided portions of the bobbin 3 are connected to each other and the bobbin 3 can be opened and closed.

  In addition, the attachment portion 3e for fixing the connection terminal fixing member 5 is provided at a location facing the position where the hinge 3d of the flange portion 3b of the bobbin 3 is provided.

  The eddy current flaw detection coil 4 includes a strip-like insulating coil (hereinafter simply referred to as an input / output coil) 4a and rectangular connection terminal substrates 4b attached to both ends of the input / output coil 4a. One end of the wiring of the input / output coil 4a is electrically connected to a terminal of one connection terminal substrate 4b of the input / output coil 4a, and the other end of the wiring is connected to a terminal of the other connection terminal substrate 4b of the input / output coil 4a. Connect electrically.

  Here, the input / output coil 4a is detachably connected to the connection terminal board 4b. Specifically, for example, the connection terminal board 4b is composed of a flat plate provided with terminals in the longitudinal direction and another flat plate superimposed on the flat plate, and the two flat plates can be opened and closed. A structure in which one side of the direction is connected. Then, the two stacked flat plates are opened and the terminals provided on one flat plate are aligned with the ends of the wiring of the input / output coil 4a so that the flat plates are closed and placed between the two flat plates. The end of the output coil 4a is sandwiched and fixed. As described above, when the input / output coil 4a is detachably connected to the connection terminal board 4b, the input / output coil 4a is deteriorated or damaged, so that the detection capability is reduced or cannot be detected. Only the input / output coil 4a is replaced, and other parts / members can be used as they are. Thereby, the cost of apparatus maintenance can be suppressed.

  The connection terminal fixing member 5 includes two fixing plates 5a that face each other in an assembled state of the eddy current flaw detection sensor 2 for measurement, and an attachment member 5b that is attached to a position near both ends of the one fixing plate 5a. (In the following, the fixing plate 5a to which the mounting member 5b is attached, of the two fixing plates 5a, will be referred to as the first fixing plate 5a, and the other fixing plate 5a will be referred to as the second fixing plate. A plate 5a), fixed to the center of each fixing plate 5a in a state of passing through the fixing plate 5a, and fitted and electrically connected to the one attached to the other fixing plate 5a. Input / output terminal 5c that can be freely connected, a power / signal connector 5d that is provided at the center upper end of the first fixing plate 5a and is electrically connected to the input / output terminal 5c, and the first fixing plate 5a. Guy attached to Pin 5e and constituted by a second guide pin through holes 5f provided in the fixing plate 5a.

  The attachment member 5b of the connection terminal fixing member 5 is attached to the attachment portion 3e provided on the flange portion 3b of one of the bobbins 3 divided in the axial direction, and the fixing plate 5a is attached to the outer peripheral surface of the bobbin 3. The connection terminal fixing member 5 is fixed to the bobbin 3 in an upright state. In the present embodiment, the attachment member 5b is attached to the attachment portion 3e with screws and supports the first fixing plate 5a with screws. The second fixed plate 5a is fixed to the first fixed plate 5a supported by the mounting member 5b by fitting the input / output terminals 5c to each other.

  The input / output coil 4 a of the eddy current testing coil 4 is wound around the groove 3 c of the bobbin 3, and the terminals of the connection terminal board 4 b at both ends are fitted into the input / output terminals 5 c of the connection terminal fixing member 5. It is electrically connected to the output terminal 5c.

  The power / signal connector 5d is a terminal for connecting a power source and a cable from a signal processing device (not shown). The power / signal connector 5d is electrically connected to the input / output terminal 5c.

  In this embodiment, the guide pin 5e is attached to the first fixing plate 5a supported by the attachment member 5b among the two fixing plates 5a. The second fixing plate 5a is provided with guide pin through holes 5f.

  In the present embodiment, the two guide pins 5e are provided in a positional relationship that sandwiches the input / output terminal 5c near the diagonal position of the first fixing plate 5a. In the present embodiment, the guide pin 5e is attached through the first fixing plate 5a, and is fixed with the first fixing plate 5a sandwiched between the intermediate convex portion of the guide pin 5e and the nut.

  The guide pin through hole 5f is a hole for inserting and fixing the guide pin 5e. For this reason, the guide pin through hole 5f can be inserted by sliding the guide pin 5e, and can be fastened and fixed to an extent that the guide pin 5e once inserted does not wobble and cannot be easily removed. It is adjusted to the size. The guide pin through hole 5f is provided in accordance with the position of the guide pin 5e in a state where the input / output terminals 5c provided in the respective fixing plates 5a are in the fitting position.

  By providing the guide pin 5e and the guide pin through-hole 5f for fixing the inserted guide pin 5e, the input / output terminal 5c is fitted each time the measurement operation and the eddy current flaw detection sensor jig 1 are replaced. Even if the terminal connection part is worn away by repeating the step and the removal, the connection force between the input / output terminals 5c is weakened, so that the two fixing plates 5a are stabilized by the guide pin 5e and the guide pin through hole 5f. Can be fixed. As a result, it is possible to perform measurement in a stable state by preventing the fitted input / output terminal 5c from wobbling and causing noise in the output signal and the input / output terminal 5c coming off and becoming unmeasurable. it can. Furthermore, by providing the guide pin 5e and the guide pin through hole 5f, the guide pin 5e is fixed to each of the two fixed plates 5a aligned by inserting the guide pin 5e into the guide pin through hole 5f. Since the input / output terminals 5c are fitted to each other, the input / output terminals 5c can be easily fitted to each other even if the input / output terminals 5c cannot be directly observed.

  The eddy current flaw detection sensor jig 1 of the present embodiment is used by being fitted into the through hole 3 a of the bobbin 3. Specifically, with the input / output terminal 5c being fitted once removed, the input / output coil 4a wound around the groove 3c of the bobbin 3 is unwound and the bobbin 3 is opened (FIG. 5A), The body 1a of the eddy current flaw detection sensor jig 1 is fitted into the through hole 3a by aligning the axial center of the through hole 3a with the axial direction of the bottom 1b of the inspection object position fixing recess 1d (FIG. 5B )). In FIG. 5, the eddy current flaw detection coil 4 and the second fixing plate 5a are not shown.

  Then, the inspection object position fixing recess 1d of the eddy current flaw detection sensor jig 1 is entered from the opening, and the linear / tubular inspection object is fitted to the bottom 1b.

  After that, after closing the bobbin 3, the input / output coil 4a is wound around the groove 3c of the bobbin 3, and the input / output terminal 5c is aligned with the two fixing plates 5a by the guide pin 5e and the guide pin through hole 5f. They are fitted together and measurement for detecting damage to the inspection object is started. Here, since the flange portion 1c of the jig 1 for eddy current flaw detection sensor has an outer diameter larger than the diameter of the through hole 3a of the bobbin 3, the eddy current is detected at the time of measurement of damage detection of the linear / tubular inspection object. Even if the current flaw detection sensor 2 is moved along the object to be inspected, the eddy current flaw detection sensor jig 1 is not detached from the through hole 3 a of the bobbin 3.

  According to the eddy current flaw detection sensor jig 1 of the present invention having the above configuration, the position of the inspection object can be fixed at the center position of the eddy current flaw detection coil 4 at all times during measurement. For this reason, it is possible to detect the deterioration state due to corrosion of the inspection object with high accuracy, and to improve the reliability of detection of damage by the eddy current flaw detection sensor 2. Even if the outer diameter of the inspection object varies, the deterioration state of the inspection object can be quantitatively detected with high accuracy using the single eddy current flaw detection sensor 2. For this reason, even if the outer diameters of the inspection objects are various, it is only necessary to prepare the jig 1 to be fitted in the through hole 3a of the bobbin 3, so that the cost for manufacturing the sensor can be suppressed.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in this embodiment, since the bobbin 3 of the eddy current flaw detection sensor 2 is configured to be opened and closed by being divided into two in the axial direction by a plane passing through the axial center, the eddy current flaw detection sensor jig 1 includes the main body 1a. The flange portion 1c may be integrated with the flange portion 1c, but the eddy current flaw detection sensor jig 1 can be attached to the bobbin 3 even when the bobbin 3 of the eddy current flaw detection sensor 2 cannot be opened and closed. Thus, the main body 1a of the eddy current flaw detection sensor jig 1 and at least one of the flanges 1c at both ends in the axial direction of the main body 1a are detachably divided, or the main body 1a is pivoted. It may be configured to be detachably divided by a plane perpendicular to the center.

  Moreover, in this embodiment, the flange part 1c is provided over the whole periphery of the axial direction both-sides edge part of the main-body part 1a except the opening part of the test object position fixed recessed part 1d of the jig | tool 1 for eddy current flaw detection sensors. However, the present invention is not limited to this, and the flange portion 1c only needs to be provided on at least a part of each peripheral edge of both end portions in the axial direction of the main body portion 1a. Even if part of the peripheral edge of the end portion protrudes as the flange portion 1c, the axis of the through hole 3a of the bobbin 3 is moved along the linear / tubular inspection object at the time of measurement. Even if it is moved in the direction of the heart, the eddy current flaw detection sensor jig 1 is not detached from the through hole 3a.

  In the present embodiment, the inspection object position fixing recess 1d has a bottom 1b for slidably holding the inspection object at the axial center position of the main body 1a and a sector shape having the axial center position of the main body 1a as a vertex. Although it is a combined shape and is provided in a shape in which the width of the recess gradually and gradually expands from the bottom 1b to the opening of the inspection object position fixing recess 1d (FIG. 6 (A)), it is limited to this. Instead, the width of the opening may be the same as the width of the bottom 1b, and the width of the inspection object position fixing recess 1d may not be changed, and may be a U-shaped groove as a whole (FIG. 6B). The width of the recess may be gradually increased from the bottom 1b to the opening (FIG. 6C). If the test object is not an actual working overhead wire or the like but a test piece, the structure for holding the test object in a slidable manner is not a recess but a penetration that matches the outer diameter of the test piece. It may be a hole.

  In the present embodiment, the bobbin 3 and the eddy current flaw detection sensor jig 1 are configured as separate bodies, and the body portion 1a of the eddy current flaw detection sensor jig 1 is fitted into the through hole 3a. However, the present invention is not limited to this, and the eddy current flaw detection sensor jig and a part of the bobbin may be configured integrally. Specifically, as shown in FIG. 7, among the bobbins divided in the axial direction, the bobbin on which the connection terminal fixing member 5 is not attached (part of the one functioning as a bobbin) and the eddy current flaw detection sensor The jig 1 ′ for the eddy current flaw detection sensor may be configured by integrating the jig. In this case, the eddy current flaw detection sensor jig 1 'can be rotatably connected to or removed from the bobbin 3' to which the connection terminal fixing member 5 is attached by a hinge 3d. In this case, it is not necessary to provide flange portions at both end portions in the axial direction of the main body 1a. In the case of this configuration, the position of the inspection object can be fixed at the center position of the eddy current flaw detection coil 4 in the same manner as the eddy current flaw detection sensor jig 1 of the above-described embodiment. It is possible to detect the deterioration state with high accuracy, and even if the outer diameter of the object to be inspected varies, it is only necessary to prepare a jig, so that the cost of sensor production can be suppressed.

  In the present embodiment, the bottom 1b is provided so as to slidably hold the inspection object at the axial center position of the main body 1a. However, the present invention is not limited to this. The bottom part 1b should just be provided so that it may hold | maintain in the substantially axial center position of 1a. Even if it is not strictly the axial center position of the main body 1a, it is possible to measure with high accuracy by positioning the inspection object at a certain position in the vicinity of the axial center.

  In this embodiment, the guide pin 5e is attached to the first fixing plate 5a supported by the attachment member 5b of the two fixing plates 5a, and the guide pin through hole 5f is provided in the second fixing plate 5a. However, the present invention is not limited to this. The guide pin through hole 5f is provided in the first fixing plate 5a, and the guide pin 5e is attached to the second fixing plate 5a. Alternatively, the guide pin 5e may be attached to each fixing plate and the guide pin through hole 5f may be provided.

  In this embodiment, two guide pins 5e are attached, but the number of guide pins 5e is not limited to this, and the number of guide pins 5e may be one, or three or more. But it ’s okay.

  Moreover, the eddy current flaw detection sensor jig 1 of the present invention is used by being attached to an eddy current flaw detection sensor having at least a cylindrical bobbin having a through hole and an eddy current flaw detection coil wound around the bobbin. The eddy current flaw detection sensor that exhibits the desired effect and to which the jig 1 of the present invention can be applied is not limited to the eddy current flaw detection sensor 2 described in detail in the present embodiment.

It is a perspective view which shows an example of embodiment of the jig for eddy current flaw detection sensors of this invention. It is a side view of the eddy current flaw detection sensor in a state where the eddy current flaw detection sensor jig of the embodiment is mounted. It is a longitudinal cross-sectional view of the eddy current flaw detection sensor in a state where the eddy current flaw detection sensor jig of the embodiment is mounted. It is a bottom view of an eddy current flaw detection sensor in a state where the eddy current flaw detection sensor jig of the embodiment is mounted. It is a figure explaining attachment to the eddy current flaw detection sensor of the jig for eddy current flaw detection sensors of an embodiment. (A) is the figure of the state which opened the bobbin of the eddy current flaw detection sensor. (B) is the figure of the state which fitted the main-body part of the jig | tool for eddy current flaw detection sensors in the through-hole of the bobbin. It is a figure explaining the shape of the inspection object position fixed recessed part of the eddy current flaw detection sensor of this invention. (A) is a figure in the case of the shape where the width | variety of a test object position fixed recessed part expands gradually gradually toward an opening part. (B) is a figure in the case of the shape where the width | variety of a test object position fixed recessed part does not change. (C) is a figure in the case of the shape where the width | variety of a test object position fixed recessed part expands in steps toward an opening part. It is a figure which shows the jig | tool for eddy current test sensors at the time of comprising a part of bobbin and the jig | tool for eddy current test sensors as one. It is a figure explaining the condition of the flaw detection by the conventional eddy current flaw detection sensor. (A) is a figure in case a test subject is located in the approximate center of the through-hole of a coil bobbin. (B) is a figure in case a test subject has shifted | deviated largely from the center of the through-hole of a coil bobbin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jig for eddy current flaw detection sensor 1a Main body part 1b Bottom part 1c Flange part 1d Inspection object position fixing recessed part 1e Through hole 2 Eddy current flaw detection sensor 3 Bobbin 3a Through hole 3b Flange part 3c Groove 3d Hinge 3e Mounting part 4 Eddy current flaw detection Coil 4a Input / output coil 4b Connection terminal board 5 Connection terminal fixing member 5a Fixing plate 5b Mounting member 5c Input / output terminal 5d Power / signal connector 5e Guide pin 5f Guide pin through hole

Claims (2)

A main body that is formed of a non-conductive material and is fitted into a through hole of the bobbin of an eddy current flaw detection sensor that has at least a cylindrical bobbin having a through hole and an annular eddy current flaw detection coil wound around the bobbin. And a flange portion formed at an outer diameter larger than the diameter of the through hole of the bobbin and provided at at least a part of each peripheral edge of both axial end portions of the main body portion, and the shaft of the main body portion wherein a U-groove body portion is formed with a width greater than the outer diameter of the test object in mind the position slidably held while fixing the position of the test object to the center position of the eddy current coils An eddy current flaw detection sensor jig characterized in that a test object position fixing concave portion is provided which is formed with an axial center position of the vertices as a vertex and is formed by a cutout portion of a fan-shaped cross section communicating with the U-shaped groove . A cylindrical bobbin having a through-hole and an annular eddy current flaw detection coil wound around the bobbin; and formed in the through-hole of the bobbin by a non-conductive material to penetrate the bobbin A main body portion fitted into the hole, and a flange portion formed at an outer diameter larger than the diameter of the through hole of the bobbin and provided at at least a part of each peripheral edge of the axially opposite end portions of the main body portion, and the main body a U-shaped groove for slidably holding is formed with a width greater than the outer diameter of the test object in a central axial position of the part while fixing the position of the test object to the center position of the eddy current coils A vortex comprising a jig provided with an inspection object position fixing recess formed by a notch portion having a fan-shaped cross section formed with the axial center position of the main body portion as a vertex and communicating with the U-shaped groove. Current flaw detection sensor.

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