JP4924938B2 - Electromagnetic ultrasonic probe - Google Patents

Description

  The present invention relates to an electromagnetic ultrasonic probe for flaw detection of a cylindrical or cylindrical flaw detection material such as a steel bar or a steel pipe, and in particular, can efficiently change the flaw detection portion of the flaw detection material, The present invention relates to an electromagnetic ultrasonic probe capable of increasing flaw detection efficiency.

  In general, it is necessary to inspect and detect defects in the surface and inside of a cylindrical or cylindrical flawed material made of a metal material such as steel bar or steel pipe from the viewpoint of quality assurance. is there. Specifically, it is necessary to detect, remove, etc., products and parts that deviate from standards related to wrinkles and materials in the manufacturing process (including the inspection process). As one of such inspection methods, an ultrasonic flaw detection method is known.

  In conventional ultrasonic flaw detection methods, an ultrasonic probe including a piezoelectric element is often used as an ultrasonic probe that transmits and receives ultrasonic waves. However, when an ultrasonic probe including a piezoelectric element is used, it is necessary to apply a contact medium (water, oil, etc.) to the surface of the flaw detection material, and there have been cases where stable flaw detection becomes difficult.

  Therefore, for example, as described in Patent Document 1, various ultrasonic flaw detection methods using an electromagnetic ultrasonic probe that directly excites ultrasonic waves to a flaw detection material without using a contact medium have been proposed.

As shown in FIG. 2 of Patent Document 1, an electromagnetic ultrasonic probe described in Patent Document 1 (electromagnetic ultrasonic sensor in Patent Document 1) is a columnar flaw detection material (measured in Patent Document 1). The magnetizing coil (in the patent document 1, the solenoid coil 14) surrounding the object 30) and a meandering coil disposed in the magnetizing coil are provided. The magnetizing coil is connected to a DC power source, and can apply a static magnetic field along the axial direction of the flaw detection material to the flaw detection material. On the other hand, the meandering coil is wound around the outer peripheral surface of the flaw detection material and connected to an AC power source, and the direction of current flow changes periodically. By changing the direction of the current flowing through the meandering coil, the magnitude of the alternating magnetic field in the direction perpendicular to the axial direction of the flaw detection material generated by the meandering coil varies. As the magnitude of the alternating magnetic field varies, the direction of the synthetic magnetic field formed by the alternating magnetic field and the static magnetic field generated by the magnetizing coil varies around the axial direction of the flaw detection material. By changing the direction of the combined magnetic field in this way, a transverse wave (SH wave) is generated that propagates in the circumferential direction of the flaw detection material with the vibration direction being the axial direction of the flaw detection material. A flaw existing in the flaw detection material can be detected by detecting a reflected echo from the SH wave flaw. Moreover, the abnormality of the material which exists in a to-be-examined material can be detected by detecting the propagation speed of this SH wave.
JP 2001-208526 A

  According to the electromagnetic ultrasonic flaw detection method using the electromagnetic ultrasonic probe as described in Patent Document 1, no contact medium is required, and it is also necessary to bring the electromagnetic ultrasonic probe into contact with the surface of the flaw detection material. Therefore, there is an advantage that stable flaw detection is possible.

  The winding method and the removal method of the meandering coil constituting the electromagnetic ultrasonic probe described in Patent Document 1 are not specifically disclosed in Patent Document 1, but this kind of meandering coil is not disclosed. Generally, the operator performs the winding manually, and after winding the meandering coil around the flaw detection portion of the flaw detection material, the meandering coil is generally fixed to the flaw detection material using an adhesive tape or the like. Then, the meandering coil is removed by the operator manually peeling the meandering coil together with the adhesive tape from the flaw detection material.

  However, in order to detect the entire flaw detection material, it is necessary to repeatedly perform the above-described manual operation of the operator while sequentially changing the portion of the flaw detection material around which the meander coil is wound, which is extremely troublesome.

  The present invention has been made to solve such problems of the prior art, and can efficiently change the flaw detection portion of the flaw detection material, and can improve the flaw detection efficiency. It is an issue to provide.

In order to solve the above-mentioned problems, the present invention provides an electromagnetic ultrasonic probe for flaw detection of a columnar or cylindrical flaw detection material as defined in claim 1, wherein A flexible sheet body that surrounds the flaw detection material, is disposed in the magnetization coil, and has a meandering coil for ultrasonic transmission / reception, and is wound around the outer peripheral surface of the flaw detection material, and the sheet And a winding mechanism for applying a tensile force to at least one end in the longitudinal direction of the sheet body, the magnetizing coil includes an opening, and the winding mechanism is A guide part for guiding at least one end of the sheet body to the outside of the magnetizing coil through the opening, and an outer side of the magnetizing coil, and the guide part of the magnetizing coil Led outside Serial; and a driving motor for applying a tensile force to the end portion of the sheet body, the winding mechanism is by applying a tensile force to the sheet member at the time of flaw detection, the sheet said to test object material An electromagnetic ultrasonic probe characterized in that the state in which the sheet body is wound around the flaw detection material is released by releasing the application of a tensile force to the sheet body after the flaw detection is performed. Is.

  The electromagnetic ultrasonic probe according to the present invention applies a tensile force to a sheet body provided with a meandering coil for ultrasonic transmission / reception at the time of flaw detection, so that the sheet body is wound around a material to be inspected, and after the flaw detection is applied to the sheet body. The winding mechanism part which cancels | releases the provision of tension | tensile_strength of a sheet | seat and cancel | releases the state by which the sheet | seat body was wound around the to-be-examined material. That is, according to the electromagnetic ultrasonic probe according to the present invention, by applying a tensile force to the sheet body, the sheet body is wound around the flaw detection material, by releasing the application of the tensile force to the sheet body, The state in which the sheet body is wound around the flaw detection material is released. Therefore, according to the electromagnetic ultrasonic probe of the present invention, it is possible to efficiently perform the winding of the sheet member around the flaw detection material and the release of the state wound around the flaw detection material. Therefore, according to the present invention, the state in which the sheet body is wound around the predetermined part of the flaw detection material is released, and the change of the winding position of the sheet body is performed by winding the sheet body around the other part of the flaw detection material. (Change of the flaw detection site of the flaw detection material) can be performed efficiently, and flaw detection efficiency of the flaw detection material can be increased.

  As described above, the flexible sheet is disposed in the magnetizing coil. However, the term “inside the magnetizing coil” here does not necessarily mean the inside of the magnetizing coil. In the case of being composed of a plurality of parts divided into two, it means that the position between each divided part is also included.

Further , according to the present invention , since the drive motor is disposed outside the magnetizing coil, the influence of the magnetic field generated by the magnetizing coil and the meandering coil for ultrasonic transmission / reception included in the sheet member on the driving motor is reduced. It is possible to avoid malfunction of the drive motor.

  Preferably, the magnetizing coil and the winding mechanism are integrally formed.

  According to such a preferable configuration, since the magnetizing coil and the winding mechanism portion are integrally formed, the electromagnetic ultrasonic probe can be easily moved in the axial direction of the flaw detection material.

  According to the present invention, the flaw detection site of the flaw detection material can be changed efficiently, and the flaw detection efficiency of the flaw detection material can be increased.

(Embodiment 1)
FIG. 1 is a perspective view of the internal structure of an electromagnetic ultrasonic probe 1 according to this embodiment in which a columnar or cylindrical flaw detection material 10 is inserted, and FIG. 2 is a columnar or cylindrical object to be detected. 1 is a side view of an electromagnetic ultrasonic probe 1 according to an embodiment in which a flaw detection material 10 is inserted. FIG. As shown in FIGS. 1 and 2, an electromagnetic ultrasonic probe 1 according to the present embodiment is disposed in a magnetizing coil 2 that surrounds a material to be inspected 10, the magnetizing coil 2, and is used for transmitting and receiving ultrasonic waves. The flexible sheet body 3 wound around the outer peripheral surface of the flaw detection material 10 and the sheet body 3 are supported, and a tensile force is applied to one end portion in the longitudinal direction of the sheet body 3. Winding mechanism 4. The winding mechanism unit 4 winds the sheet body 3 around the flaw detection material 10 by applying a tensile force to the sheet body 3 at the time of flaw detection, while releasing the application of the tensile force to the sheet body 3 after the flaw detection, The sheet body 3 is configured to be able to release the state in which the sheet body 3 is wound around the flaw detection material 10.

  Note that the electromagnetic ultrasonic probe 1 according to the present embodiment includes a rectangular tube-shaped housing 5 (shown by a broken line in FIG. 1) in which a through hole 51 penetrating in the arrow W direction is formed. In the housing 5, the magnetizing coil 2, the sheet body 3, and the winding mechanism unit 4 are disposed, and the magnetizing coil 2 and the winding mechanism unit 4 are formed integrally with the housing 5. The housing 5 is movable along the through direction of the through hole 51.

  As shown in FIG. 1, the magnetizing coil 2 is formed in a cylindrical shape. The magnetizing coil 2 is disposed in the housing 5 so that the axial direction is parallel to the through direction of the through hole of the housing 5. By being arranged in this way, it is possible to insert the columnar and cylindrical flaw detection materials 10 into the magnetizing coil 2 from the outside of the housing 5. Further, the magnetizing coil 2 includes an opening 23. The opening 23 is a hole that penetrates the magnetizing coil 2 in the radial direction. The opening 23 is formed in a portion in the circumferential direction at the axial central portion of the magnetizing coil 2 (in this embodiment, the upper portion in FIG. 1).

  As shown in FIG. 1, the magnetizing coil 2 having such a configuration includes a cylindrical bobbin 21 and a coil 22. The bobbin 21 is formed with a hole that penetrates the bobbin 21 in a radial direction at a portion corresponding to the opening 23. The coil 22 is wound around the outer peripheral surface excluding the through hole of the bobbin 21 and is connected to a DC power source of a known flaw detector (not shown). When a direct current flows through the coil 22, an axial static magnetic field is generated in the magnetization coil 2, and a static magnetic field is applied to the flaw detection material 10 inserted through the magnetization coil 2. In the present embodiment, the power source to which the coil 22 is connected is a DC power source, but the power source to which the coil 22 is connected is not limited to a DC power source but may be an AC power source. When an alternating current is passed through the coil 22, magnetic flux concentrates in the vicinity of the surface layer of the flaw detection material 10 due to the skin effect. Therefore, when performing surface layer flaw detection, the coil 22 is preferably connected to an AC power source.

  The sheet body 3 is formed in a belt shape. FIG. 3 is a side view of a part of the sheet body 3 and the winding mechanism unit 4. As shown in FIG. 3, in the sheet body 3, one surface is an uneven surface portion 30a having an uneven shape in which unevenness repeatedly appears along the longitudinal direction, and the other surface is a flat flat surface portion 30b. Yes.

  FIG. 4 is an exploded perspective view of the sheet body 3. As shown in FIG. 4, the sheet body 3 is configured by laminating a band-shaped base sheet 31 and a band-shaped meandering coil layer 32 by heat treatment or an adhesive.

  One surface of the base material sheet 31 forms an uneven surface portion 30 a of the sheet body 3. The material of the base sheet 31 is not particularly limited as long as it has flexibility, and for example, a resin can be used. On the other hand, the meandering coil layer 32 is laminated on the other surface of the base material sheet 31 (the surface on the side opposite to the uneven surface portion 30a). The meandering coil layer 32 has a five-layer structure. The first layer (first to fifth layers in order from the base sheet 31 side) to the fifth layer are laminated by heat treatment or an adhesive.

  The first layer, the third layer, and the fifth layer of the meandering coil layer 32 are composed of sheet materials 33, 35, and 37 having flexibility and non-conductivity. The surface opposite to the fourth layer of the sheet material 37 constituting the fifth layer forms a flat surface portion 30 b of the sheet body 3. The second layer includes a sheet material 34 having flexibility and non-conductivity, and a transmission meandering coil 34 a disposed on the sheet material 34. The fourth layer includes a sheet material 36 having flexibility and non-conductivity, and a receiving meander coil 36 a disposed on the sheet material 36. The material of the sheet materials 33 to 37 constituting each layer of the first layer to the fifth layer is not particularly limited as long as it has flexibility and non-conductivity. For example, a non-woven fabric using aramid fibers ( Aramid paper) can be used. Further, the transmission meandering coil 34 a and the receiving meandering coil 36 a are formed by a conducting wire provided with a meandering portion 38 having a portion arranged in parallel with the short-side direction of the belt-like sheet body 3. The material of the conducting wire forming the transmitting meandering coil 34a and the receiving meandering coil 36a is not particularly limited, and for example, a copper foil having a thickness of 18 μm can be used. In the present embodiment, the transmission meandering coil 34a and the receiving meandering coil 36a constitute the meandering coil for ultrasonic transmission / reception described above.

  The length of the sheet body 3 in the longitudinal direction is not particularly limited, but the outer peripheral length of the flaw detection material 10 having the maximum outer peripheral length among the flaw detection materials 10 that can be flawed by the electromagnetic ultrasonic probe 1. It is preferable to set it to 1/2 or more. Further, the length of the sheet body 3 in the short direction is such that one end portion of the sheet body 3 in the longitudinal direction can be guided outward from the inside of the magnetizing coil 2 through the opening 23. Is preferably shorter than the width of the opening 23 (the axial length of the magnetizing coil 2).

  Further, the meandering portion 38 of the transmitting meandering coil 34a and the receiving meandering coil 36a does not need to be formed in the entire longitudinal direction of the sheet body 3, and may be a part. The length of the meandering portion 38 when formed in a part is, for example, 1 / of the outer peripheral length of the flaw detection material 10 having the maximum outer peripheral length among the flaw detection materials 10 that can be flawed by the electromagnetic ultrasonic probe 1. 2 or more is preferable. The length of the meandering portion 38 is set to ½ or more of the outer peripheral length of the flaw detection material 10 having the maximum outer peripheral length. The portion around which the meandering portion 38 is wound is less than ½ of the outer peripheral length of the flaw detection material 10. This is because the signal detection sensitivity is lowered.

  As described above, the winding mechanism unit 4 is configured to support the sheet body 3 and to wind the sheet body 3 around the outer peripheral surface of the flaw detection material 10. As illustrated in FIG. 3, the winding mechanism unit 4 is configured so that the flat surface portion 30 b of the sheet body 3 is in contact with the outer peripheral surface of the flaw detection material 10 when the sheet body 3 is wound around the flaw detection material 10. Support. As shown in FIGS. 1 and 2, the winding mechanism 4 includes a guide 41 for guiding one end of the sheet body 3 in the longitudinal direction to the outside of the magnetizing coil 2 through the opening 23, and a magnetizing coil. And a drive motor 42 for applying a tensile force to one end portion of the sheet body 3 guided to the outside of the magnetizing coil 2 by the guide portion 41. Further, the winding mechanism unit 4 according to the present embodiment includes a first gripping unit 43, a first driven roller 44, a third driven roller 45, and a driving roller 46 in addition to the guide unit 41 and the driving motor 42. It has.

  The first grip 43 holds the other end of the sheet body 3 in the longitudinal direction. The first grip 43 is disposed on the radially outer side of the magnetizing coil 2 with respect to the opening 23 of the magnetizing coil 2, and is fixed to the bobbin 21 via a support plate 431 extending from the bobbin 21 in the radially outward direction. Has been. The first grip 43 is connected to the transmission meandering coil 34a and the reception meandering coil 36a by gripping the other end of the sheet 3 in the longitudinal direction. The first grip 43 is connected to the above-described flaw detector, and the transmission meander coil 34a and the reception meander coil 36a are connected to the flaw detector via the first grip 43.

  As shown in FIGS. 1 and 3, the first driven roller 44 is disposed on the radially inner side of the magnetizing coil 2 with respect to the opening 23 of the magnetizing coil 2 and extends from the bobbin 21 in the radially inward direction. It is fixed to the bobbin 21 via a plate 441. The sheet body 3 is wound around the first driven roller 44 so that the uneven surface portion 30 a of the sheet body 3 is in contact, and the surface of the first driven roller 44 in contact with the sheet body 3 is the uneven surface portion 30 a of the sheet body 3. Are formed in a concavo-convex shape so as to mesh with each other. In the sheet body 3, a winding portion 33 between the other end portion in the longitudinal direction gripped by the first gripping portion 43 and a portion wound around the first driven roller 44 is located inside the magnetization coil 2. The flaw detection material 10 inserted into the magnetizing coil 2 can be inserted inside the wound portion 33.

  The guide part 41 is realized by a second driven roller. As shown in FIGS. 1 and 3, the second driven roller is disposed on the radially outer side of the magnetizing coil 2 facing the first driven roller 44 across the opening 23 of the magnetizing coil 2, and is out of the bobbin 21. It is fixed to the bobbin 21 via a support plate 411 extending in the direction. In the second driven roller, a portion of one end of the sheet body 3 in the longitudinal direction (the end opposite to the first gripping portion 43) side of the portion wound around the first driven roller 44 of the sheet body 3 is wound. It is hung. In this way, the portion of the sheet body 3 on the one end side in the longitudinal direction with respect to the portion wound around the first driven roller 44 is wound around the second driven roller disposed outside the magnetizing coil 2. As a result, a portion on one end side in the longitudinal direction of the sheet body 3 is guided to the outside of the magnetizing coil 2 through the opening 23 of the magnetizing coil 2. As shown in FIG. 3, the sheet body 3 is wound around the second driven roller so that the uneven surface portion 30a of the sheet body 3 is in contact with the surface of the second driven roller in contact with the sheet body 3. It is formed in a concavo-convex shape so as to mesh with the concavo-convex surface portion 30 a of the sheet body 3.

  As shown in FIG. 3, the third driven roller 45 and the drive roller 46 are disposed outside the magnetizing coil 2 (in the present embodiment, at a position separated from the second driven roller in a substantially horizontal direction). The third driven roller 45 and the driving roller 46 are arranged so as to face each other in the vertical direction. Between the third driven roller 45 and the driving roller 46, a portion (one end portion in the longitudinal direction of the sheet body 3) guided to the outside of the magnetization coil 2 by the second driven roller of the sheet body 3 is inserted. Yes. In the sheet body 3, the uneven surface portion 30 a faces the driving roller 46, and the flat surface portion 30 b faces the third driven roller 45. As described above, one end of the sheet body 3 in the longitudinal direction is inserted between the third driven roller 45 and the driving roller 46, so that the sheet body 3 is sandwiched between the third driven roller 45 and the driving roller 46. The third driven roller 45 is directly fixed to the housing 5, and the surface in contact with the sheet body 3 is formed flat (circular cross section). on the other hand. The driving roller 46 is directly fixed to the housing 5, and the surface in contact with the sheet body 3 is formed in an uneven shape so as to mesh with the uneven surface portion 30 a of the sheet body 3.

  Thus, the sheet body 3 is sandwiched between the third driven roller 45 and the driving roller 46, and the surface of the driving roller 46 is formed in an uneven shape, so that the driving roller 46 and the uneven surface portion 30a of the sheet body 3 are formed. Engage well. For this reason, when the driving roller 46 rotates in the forward direction (rotation in the direction of arrow L shown in FIG. 3), a tensile force in the direction of arrow X is applied to one end of the sheet member 3, and the driving roller 46 rotates in the reverse direction (indicated by the arrow in FIG. (Rotation in the R direction), the application of the tensile force in the direction of the arrow X to one end of the sheet body 3 is released.

  The drive motor 42 is connected to the drive roller 46 described above, and is configured to be able to rotate the drive roller 46 forward and backward. The drive motor 42 is controlled by a control unit (not shown). The control unit includes a rotation control unit that performs rotation control of the drive motor 42, and a winding switch and a winding release switch that are operated by an operator of the electromagnetic ultrasonic probe 1.

  When the winding switch is operated, the rotation control unit rotates the driving roller 46 in the normal direction by the driving motor 42 and applies a tensile force in the direction of the arrow X to one end portion in the longitudinal direction of the sheet body 3. When the tensile force in the arrow X direction is applied to one end portion in the longitudinal direction of the sheet body 3, the sheet body 3 moves in the arrow X direction. When the sheet body 3 moves in the arrow X direction, the winding portion 33 of the sheet body 3 is shortened. If the material to be inspected 10 is inserted inside the winding portion 33, the winding portion 33 is wound around the outer peripheral surface of the material to be inspected 10 when the winding portion 33 is shortened.

  The rotation control unit stops the driving roller 46 when the torque of the driving roller 46 reaches a predetermined threshold value while applying a tensile force in the direction of the arrow X to one end portion in the longitudinal direction of the sheet body 3. Then, the movement of the sheet body 3 in the arrow X direction is stopped. The torque of the drive roller 46 can be detected by monitoring the current flowing through the drive motor 42 that increases with the torque of the drive roller 46, for example. The driving roller 46 can be stopped by stopping the rotation of the rotor (not shown) of the driving motor 42 and locking the rotor of the driving motor 42 so that the driving roller 46 does not rotate. . Further, stopping the driving roller 46 when the torque of the driving roller 46 reaches a predetermined threshold value means that the torque of the driving roller 46 reaches a predetermined threshold value instead of the control of the rotation control unit. It is also possible to use a torque brake that does not rotate the driving roller 46 even when the driving motor 42 rotates.

  The above-described torque threshold of the drive roller 46 is preferably such that the winding portion 33 is wound around the outer peripheral surface of the flaw detection material 10 inserted inside the winding portion 33, and the outer peripheral surface of the flaw detection material 10 and the winding portion 33 are wound. This value is generated when the maximum distance between the meandering coil 34a for transmitting and the meandering portion 38 of the meandering coil 36a for receiving becomes 200 μm or less. The aforementioned threshold value is applied to the load generated when the maximum distance between the outer peripheral surface of the flaw detection material 10 and the meandering portion 38 of the transmitting meandering coil 34a and the meandering portion 36 of the receiving meandering coil 36a is 200 μm or less. Even if the sheet body 3 has flexibility, depending on the degree of flexibility, it is difficult to completely contact the wound portion 33 with the outer peripheral surface of the flaw detection material 10. This is because a portion that does not contact may occur. The reason why the preferable value is 200 μm or less is that when the distance between the outer peripheral surface of the flaw detection material 10 and the meandering portion 38 of the sheet body 3 exceeds 200 μm, the signal detection sensitivity is lowered.

  On the other hand, when the winding release switch is operated, the rotation control unit reverses the driving roller 46 by the driving motor 42 to move the sheet body 3 in the arrow X ′ direction, and pulls the sheet body 3 in the arrow X direction. Release the grant of power.

  FIG. 5 is a side view of the electromagnetic ultrasonic probe 1 when the inspection material 10 is inserted inside the winding portion 33 and the state in which the sheet 3 is wound around the inspection material 10 is released. . As shown in FIG. 5, the winding portion 33 becomes longer as the sheet body 3 moves in the X ′ direction. Therefore, the sheet body 3 moves in the X ′ direction in a state where the sheet body 3 is wound around the flaw detection material 10, so that a gap is formed between the wound portion 33 and the flaw detection material 10. The state wound around the flaw detection material 10 is released. Further, when the state in which the sheet body 3 is wound around the flaw detection material 10 is released as described above, the electromagnetic ultrasonic probe 1 and the flaw detection material 10 can be moved relative to each other.

  Further, the drive motor 42 is disposed outside the magnetizing coil 2. Therefore, the magnetic field generated by the magnetizing coil 2, the transmitting meandering coil 34a, and the receiving meandering coil 36a has little influence on the drive motor 42, and malfunction of the drive motor 42 can be avoided. The drive motor 42 may be provided outside the housing 5 in order to reduce the influence of the magnetic field generated by the magnetizing coil 2, the transmission meandering coil 34a, and the receiving meandering coil 36a on the drive motor 42. .

  A method for flaw-detecting a columnar or cylindrical flaw detection material 10 using the electromagnetic ultrasonic probe 1 described above will be described.

  First, the operator operates a winding release switch of the control unit. Thereby, as shown in FIG. 5, the winding part 33 becomes long. Next, the operator inserts the flaw detection material 10 inside the portion 33 around which the flaw detection material 10 is wound. Next, the operator operates the winding switch of the control unit. As a result, the drive roller 46 rotates forward, a tensile force in the arrow X direction (see FIG. 3) is applied to the sheet body 3, the sheet body 3 is pulled in the arrow X direction, and the winding portion 33 is shortened. The portion 33 wraps around the outer peripheral surface of the flaw detection material 10 (state shown in FIGS. 1 and 2).

  When the winding portion 33 is wound around the outer peripheral surface of the flaw detection material 10, the operator performs the flaw detection on the portion where the winding portion 33 of the sheet body 3 is wound using the above-described flaw detector. The flaw detection can be performed by the same method as the electronic ultrasonic sensor described in Patent Document 1. That is, a direct current is passed through the coil 22 of the magnetizing coil 2 to generate a static magnetic field, an alternating current is passed through the transmission meandering coil 34a to generate an alternating magnetic field, and a composite formed by the static magnetic field and the alternating magnetic field is formed. It can be performed by detecting the propagation speed of the SH wave generated by changing the magnetic field around the axial direction of the material to be inspected 10 by using the receiving meander coil 36a.

  When the flaw detection is completed, the operator operates the winding release switch. When the winding release switch is operated, the driving roller 46 rotates in the reverse direction, the sheet body 3 moves in the direction of the arrow X ′ (see FIG. 3), and the tensile force in the arrow X direction applied to the sheet body 3 is released. The Further, when the sheet body 3 moves in the direction of the arrow X ′, the winding portion 33 becomes longer, a gap is formed between the winding portion 33 and the flaw detection material 10, and the sheet body 3 is wound around the flaw detection material 10. Is released. As a result, the electromagnetic ultrasonic probe 1 and the flaw detection material 10 can be moved relative to each other.

  Furthermore, when flaw detection is performed for other parts, the operator moves the casing 5 in the axial direction of the flaw detection material 10 to move the electromagnetic ultrasonic probe 1 and the flaw detection material 10 to the flaw detection material 10. The flaw detection site around which the sheet 3 of the flaw detection material 10 is wound is changed by relative movement in the axial direction. When the flaw detection site is changed, as described above, the operator operates the winding switch of the control unit to perform flaw detection, and when flaw detection is performed, the operator operates the wrapping release switch to cause the sheet body 3 to be inspected. The state wound around the material 10 is released. In this way, a plurality of flaws can be detected.

  As described above, according to the electromagnetic ultrasonic probe 1 according to this embodiment, the sheet body 3 is wound around the flaw detection material 10 by applying a tensile force to the sheet body 3, and the sheet body 3. By canceling the application of the tensile force to the sheet member 3, the state in which the sheet body 3 is wound around the flaw detection material 10 is released. Such winding and release of the winding state are performed by winding the sheet body 3 (meander coil) around the material to be inspected 7 and fixing it with an adhesive tape, as in the prior art, and The operator himself is more efficient than releasing the winding state performed by peeling the sheet 3 (meandering coil) together with the adhesive tape from the flaw detection material 10. Therefore, according to the electromagnetic ultrasonic probe 1 according to the present embodiment, the state in which the sheet body 3 is wound around a predetermined part of the flaw detection material 10 is released, and the sheet body is placed on another part of the flaw detection material 10. Since the change of the winding position of the sheet member 3 (the change of the flaw detection site of the flaw detection material) performed by winding 3 can be performed efficiently, the flaw detection at a plurality of sites can be performed efficiently.

  Further, according to the electromagnetic ultrasonic probe 1 according to the present embodiment, the sheet body 3 can be wound and the winding state can be released by operating the winding switch and the winding release switch. Accordingly, it is not necessary for the operator to directly wrap the sheet 3 around the flaw detection material 10 or to remove it from the flaw detection material 10, thereby reducing the burden on the operator.

  Furthermore, in the electromagnetic ultrasonic probe 1 according to the present embodiment, since the magnetizing coil 2 and the winding mechanism 4 are formed integrally with the housing 5, the electromagnetic ultrasonic probe 1 is easily moved. be able to. Therefore, if the electromagnetic ultrasonic probe 1 is moved, the relative movement between the electromagnetic ultrasonic probe 1 and the flaw detection material 10 can be easily performed, and the flaw detection site can be changed more easily.

  The relative movement between the electromagnetic ultrasonic probe 1 and the flaw detection material 10 may be performed by moving the flaw detection material 10.

  Further, in the present embodiment, the winding mechanism unit 4 is configured to apply a tensile force only to one end portion in the longitudinal direction of the sheet body 3, but applies a tensile force to both end portions in the longitudinal direction of the sheet body 3. It is good also as composition to do.

  FIG. 6 is a side view of the winding mechanism 4 that applies a tensile force to both ends in the longitudinal direction of the sheet body 3, the magnetizing coil 2, and the sheet body 3. As shown in FIG. 6, this configuration includes a first winding mechanism 4 ′ that applies a tensile force to one end portion in the longitudinal direction of the sheet body 3, and a first winding mechanism that is disposed at the other end portion in the longitudinal direction of the sheet body 3. And a second winding mechanism portion 4 ″ for applying a tensile force in the opposite direction to the tensile force applied by the portion 4 ′. The first winding mechanism portion 4 ′ and the second winding mechanism portion 4 ″ include first driven rollers 44 ′ and 44 ″, second driven rollers that function as guide portions 41 ′ and 41 ″, respectively, 3 driven rollers 45 ′, 45 ″, drive rollers 46 ′, 46 ″, and drive motors 42 ′, 42 ″. One end portion of the sheet body 3 in the longitudinal direction is inserted between the third driven roller 45 ′ and the driving roller 46 ′ of the first winding mechanism unit 4 ′, and the third winding mechanism unit 4 ″ has a third end. The other end in the longitudinal direction of the sheet body 3 is inserted between the driven roller 45 ″ and the driving roller 46 ″. In this configuration, the transmission meandering coil 34a and the receiving meandering coil 36a are connected to the above-described flaw detector, for example, a lead wire between the transmitting meandering coil 34a and the receiving meandering coil 36a and the flaw detector, etc. It can be done by connecting with.

  In this configuration, when the sheet body 3 is wound around the outer peripheral surface of the flaw detection material 10, the driving roller 46 ′ of the first winding mechanism section 4 ′ is rotated, and an arrow is placed on one end in the longitudinal direction of the sheet body 3. A tensile force in the X direction is applied, and the driving roller 46 ″ of the second winding mechanism portion 4 ″ is rotated to pull the other end portion in the longitudinal direction of the sheet body 3 in the arrow Y direction opposite to the arrow X direction. Giving power. Thus, the one end part and the other end part of the longitudinal direction of the sheet body 3 are respectively given tensile forces in opposite directions, whereby the winding portion 33 is shortened and the sheet body 3 is wound around the outer peripheral surface of the flaw detection material 10. Stick.

  On the other hand, when the state in which the sheet body 3 is wound around the flaw detection material 10 is released, the driving roller 46 ′ of the first winding mechanism 4 ′ is rotated so that one end in the longitudinal direction of the sheet body 3 is moved to the arrow X ′. And the driving roller 46 ″ of the second winding mechanism 4 ″ is rotated to move the other end of the sheet 3 in the direction of the arrow Y ′. By moving the one end and the other end in the longitudinal direction of the sheet body 3 in this way, the winding portion 33 becomes long, a gap is formed between the winding portion 33 and the flaw detection material 10, and the sheet body 3 is covered. The state wound around the flaw detection material 10 is released.

(Embodiment 2)
FIG. 7 is an end view of the electromagnetic ultrasonic probe 1A obtained by cutting the electromagnetic ultrasonic probe 1A according to the present embodiment along the longitudinal direction of a sheet body 3A to be described later, and FIG. It is a side view of 1 A of electromagnetic ultrasonic probes which concern on this embodiment seen from the arrow Z direction. As shown in FIGS. 7 and 8, the electromagnetic ultrasonic probe 1 </ b> A according to the present embodiment is similar to the electromagnetic ultrasonic probe 1 according to the first embodiment, the magnetizing coil 2 </ b> A, the sheet body 3 </ b> A, And a winding mechanism 4A. The magnetizing coil 2A, the sheet body 3A, and the winding mechanism unit 4A are arranged in a housing (not shown). The magnetizing coil 2A and the winding mechanism 4A are formed integrally with the casing.

As shown in FIG. 8, the magnetizing coil 2 </ b> A has an opening 23 </ b> A formed in the entire axial direction at the central portion in the axial direction, and a portion 2 </ b> Aa physically divided into two in the axial direction by the opening 23 </ b> A. 2Ab. Each divided part 2Aa, 2Ab has a cylindrical bobbin 21A and a coil 22A wound around the outer peripheral surface of the bobbin 21A. The coil 22A of the portion 2Aa of the magnetizing coil 2A and the coil 22A of the portion 2Ab have the same winding direction.

  The sheet body 3A has the same configuration as the sheet body 3 of the first embodiment.

  As shown in FIG. 7, the winding mechanism portion 4A includes a third driven roller 45A and a driving roller 46A, and one end portion in the longitudinal direction of the sheet body 3A is inserted between the third driven roller 45A and the driving roller 46A. And a drive motor 42A. Furthermore, the winding mechanism unit 4A according to the present embodiment includes a support member 6A in addition to the guide unit and the drive motor 42A.

  The support member 6A supports the sheet body 3A on the radially inner side of the magnetizing coil 2A. Further, the support member 6A is arranged at the same position as the opening 23A of the magnetization coil 2A in the axial direction of the magnetization coil 2A, and moves in the radial direction of the magnetization coil 2A, thereby magnetizing the support member 6A via the opening 23A. It can move between the inside of the coil 2A and the outside of the magnetizing coil 2A. The support member 6A includes a second gripping portion 61A, a fourth driven roller 62A, and a connecting portion 63A.

  The sheet body 3A is wound around the fourth driven roller 62A. The sheet body 3A is wound around the fourth driven roller 62A so that the uneven surface portion of the sheet body 3A is in contact with the fourth driven roller 62A. The surface of the fourth driven roller 62A that is in contact with the sheet body 3A is formed in an uneven shape so as to mesh with the uneven surface portion of the sheet body 3A. The fourth driven roller 62A having such a configuration is supported by the bobbin 21A of one of the portions 2Aa and 2Ab of the magnetizing coil 2A. Further, the fourth driven roller 62A can advance and retreat a predetermined distance along the radial direction of the magnetizing coil 2A (the direction of arrow S in FIG. 7). The fourth driven roller 62A moves in the radial direction of the magnetization coil 2A, moves from the outside of the magnetization coil 2A into the magnetization coil 2A via the opening 23A, and is inserted into the magnetization coil 2A. It contacts the outer peripheral surface of the flaw detection material 10A via the sheet 3A. Further, the fourth driven roller 62A moves outward of the magnetizing coil 2A through the opening 23A by moving backward in the radial direction of the magnetizing coil 2A, and is separated from the outer peripheral surface of the flaw detection material 10A. Can do. Further, the fourth driven roller 62A is provided with a proximity sensor (not shown) that detects proximity to the flaw detection material 10A.

  The second grip 61A grips the other end of the sheet body 3A in the longitudinal direction. The second grip 61A is connected to the transmission meandering coil and the receiving meandering coil of the sheet 3A. The second gripping portion 61A is connected to a flaw detector similar to that described in the first embodiment, and the transmitting meandering coil and the receiving meandering coil are connected to the flaw detector via the second gripping portion 61A. It is connected.

  The connecting portion 63A connects the second gripping portion 61A and the fourth driven roller 62A. The connecting portion 63A includes connecting pieces 64A, 65A, 66A and fulcrums 67A, 68A. One end of the connecting piece 64A is rotatably connected to the fulcrum 67A, and the other end is non-rotatably connected to the second gripping portion 61A. One end of the connecting piece 65A is rotatably connected to the fulcrum 68A, and the other end is non-rotatably connected to the fulcrum 67A. One end of the connecting piece 66A is rotatably connected to the fourth driven roller 62A, and the other end is non-rotatably connected to the fulcrum 68A.

  Further, the second gripping portion 61A and the fulcrums 67A and 68A are provided with proximity sensors (not shown) that detect proximity to the flaw detection material 10A. The length of the support member 6A from the second gripping portion 61A to the fourth driven roller 62A is the flaw detection material 10A having the minimum outer peripheral length among the flaw detection materials 10A that can be flawed by the electromagnetic ultrasonic probe 1A. The length is shorter than the outer peripheral length.

  As shown in FIG. 7, the third driven roller 45A and the driving roller 46A that constitute the guide portion are arranged to face each other in the vertical direction, and as described above, the third driven roller 45A and the driving roller 46A One end portion in the longitudinal direction of the sheet body 3A is inserted between them. As described above, the sheet body 3A contacts the flaw detection material 10A inserted through the magnetizing coil 2A when the fourth driven roller 62A advances into the magnetizing coil 2A. That is, when the fourth driven roller 62A advances into the magnetizing coil 2A, the portion of the sheet 3A wound around the fourth driven roller 62A is arranged in the magnetizing coil 2A. On the other hand, one end portion of the sheet body 3A in the longitudinal direction is inserted between the third driven roller 45A and the driving roller 46A disposed on the outer side of the magnetizing coil 2A. Is guided to the outside of the magnetizing coil 2A through the opening 23A. The third driven roller 45A and the driving roller 46A according to the present embodiment have the same configuration as the third driven roller 45 and the driving roller 46 according to the first embodiment, and, similarly to the first embodiment, the sheet In the body 3A, the uneven surface portion faces the drive roller 46A, and the flat surface portion faces the third driven roller 45A.

  Similarly to the first embodiment, the drive motor 42A is controlled by the control unit, and is configured to be able to rotate the drive roller 46A forward or backward.

  As in the first embodiment, the control unit includes a rotation control unit, a winding switch, and a winding release switch. The rotation control unit according to the present embodiment also controls the support member 6A in addition to the control of the drive motor 42A.

  When the winding switch is operated, the rotation control unit causes the drive roller 46A to freely rotate in the forward and reverse directions in which the power of the drive motor 42A is not transmitted. When the rotation of the driving roller 46A is in a freely reversible state, the sheet body 3A can move in the direction of the arrow XA (see FIG. 7) and in the opposite direction, and the winding portion 33A of the sheet body 3A (in this embodiment, It is possible to vary the length of the other end portion gripped by the second gripping portion 61A (referred to as a portion wound around the fourth driven roller 62A). FIG. 9 is a diagram illustrating the operation of the support member 6A when the winding switch is operated. As shown in FIG. 9 (a), when the drive roller 46A is allowed to rotate forward and backward, the rotation control unit is inserted into the fourth driven roller 62A and the magnetizing coil 2A by the proximity sensor of the fourth driven roller 62A. The fourth driven roller 62A is advanced in the radial direction (arrow S1 direction) of the magnetizing coil 2A until it is detected that the detected material to be inspected 10A comes into contact with the sheet body 3A. Next, the rotation control unit moves the connecting piece around the fourth driven roller 62A until the proximity sensor of the fulcrum 68A detects that the fulcrum 68A and the flaw detection material 10A are in contact with each other via the sheet 3A. 66A and fulcrum 68A are rotated in the direction of arrow T1. Next, the rotation control unit detects the connection piece 65A and the fulcrum around the fulcrum 68A until it is detected by the proximity sensor of the fulcrum 67A that the fulcrum 67A and the flaw detection material 10A are in contact with each other through the sheet 3A. 67A is rotated in the direction of arrow T2. Next, the rotation control unit focuses on the fulcrum 67A until the proximity sensor of the second gripping part 61A detects that the second gripping part 61A and the material to be inspected 10A come into contact with each other through the sheet 3A. The connecting piece 64A and the second gripping portion 61A are rotated in the direction of the arrow T3. Accordingly, as shown in FIG. 9B, the support member 6A and the winding portion 33A of the sheet body 3A are wound around the outer peripheral surface of the flaw detection material 10A.

  When the rotation control unit ends the rotation of the connecting piece 64A and the second gripping unit 61A, the drive motor 42A causes the drive roller 46A to rotate forward, and the tensile force in the direction of the arrow XA is applied to one end in the longitudinal direction of the sheet body 3A. Is granted. When a tensile force in the direction of the arrow XA is applied to one end in the longitudinal direction of the sheet body 3A, the sheet body 3A moves in the direction of the arrow XA. When the sheet body 3A moves in the direction of the arrow XA, the winding portion 33A of the sheet body 3A is shortened. If the flaw detection material 10A is inserted inside the winding portion 33A, the winding portion 33A is the outer periphery of the flaw detection material 10A. Wrap around the surface. As in the first embodiment, when the torque of the drive roller 46A reaches a predetermined threshold value, the rotation control unit stops the drive roller 46A and stops moving the sheet member 3A in the direction of the arrow XA.

  FIG. 10 is a diagram illustrating the operation of the support member 6A when the winding release switch is operated. As shown in FIG. 10, when the winding release switch is operated, the rotation control unit firstly rotates the connecting piece 64A and the second gripping part 61A around the fulcrum 67A in the direction opposite to that at the time of winding (arrow U1 in FIG. 10). The second gripping portion 61A is separated from the material to be inspected 10A. When the second gripping portion 61A is separated, the sheet body 3A is loosened, and the application of the tensile force in the arrow XA direction to the sheet body 3A is released. As a result, the state in which the sheet body 3A is wound around the flaw detection material 10A is released. When the second gripping portion 61A is separated from the flaw detection material 10A, the rotation control unit rotates the connecting piece 65A and the fulcrum 67A in the opposite direction (in the direction of arrow U2 in FIG. 10) around the fulcrum 68A. The fulcrum 67A is separated from the flaw detection material 10A. Further, when the fulcrum 67A is separated from the flaw detection material 10A, the rotation control unit rotates the connecting piece 66A and the fulcrum 68A in the opposite direction (in the direction of arrow U3 in FIG. 10) around the fourth driven roller 62A. Thus, the fulcrum 68A is separated from the flaw detection material 10A (the state shown in FIG. 9A). Finally, as shown in FIG. 7, the rotation control unit retracts the fourth driven roller 62A in the radially outward direction of the magnetizing coil 2A, and separates the support member 6A from the flaw detection material 10A.

  A method for flaw-detecting a columnar or cylindrical flaw-detecting material 10A using the electromagnetic ultrasonic probe 1A according to the present embodiment described above will be described.

  First, the operator operates a winding release switch of the control unit. Thereby, as shown in FIG. 7, the second driven roller 64A retreats in the radially outward direction of the magnetizing coil 2A. Next, the operator inserts the flaw detection material 10A into the magnetizing coil 2A.

  Next, the operator operates the winding switch of the control unit. As a result, as described above, the support member 6A and the winding portion 33A of the sheet body 3A are wound around the outer peripheral surface of the flaw detection material 10A, the sheet body 3A moves in the XA direction, and the winding portion 33A of the sheet body 3A Wrap around the outer peripheral surface of the material to be inspected 10A.

  When the winding portion 33A is wound around the outer peripheral surface of the flaw detection material 10A, the operator performs the flaw detection on the portion around which the winding portion 33A of the sheet 3A is wound using the flaw detector described above. The flaw detection can be performed by a method similar to the method described in the first embodiment.

  When the flaw detection is completed, the operator operates the winding release switch. When the winding release switch is operated, the connecting piece 64A and the second gripping portion 61A rotate around the fulcrum 67A in the direction opposite to that during winding (the direction of the arrow U1 in FIG. 10), so that the sheet body 3A is loosened. The application of the tensile force to the sheet body 3A is released. As a result, the electromagnetic ultrasonic probe 1A and the flaw detection material 10A can move relative to each other. As shown in FIG. 7, when the supporting member 6A is separated from the flaw detection material 10A, the state in which the sheet 3A is wound around the flaw detection material 10A is released.

  Further, when flaw detection is performed for other parts, the operator relatively moves the electromagnetic ultrasonic probe 1A and the flaw detection material 10A in the axial direction of the flaw detection material 10A, and the sheet body 3A of the flaw detection material 10A is moved. Change the wound area to be wound. After changing the flaw detection site, as described above, the operator operates the winding switch of the control unit to perform flaw detection, and when flaw detection is performed, the operator operates the winding release switch to cause the sheet body 3A to be inspected. The state wound around the material 10A is released. In this way, a plurality of parts can be detected.

  As described above, similarly to the electromagnetic ultrasonic probe 1 according to the first embodiment, the electromagnetic ultrasonic probe 1A according to the present embodiment applies the tensile force to the sheet body 3A, thereby reducing the sheet body 3A. Winding around the flaw detection material 10A is performed, and by releasing the application of the tensile force to the sheet member 3A, the state where the sheet member 3A is wound around the flaw detection material 10A is released. Therefore, it is possible to efficiently wrap the sheet body 3A around the flaw detection material 10A and release the state where the sheet body 3A is wound around the flaw detection material 10A as compared with the conventional case. Therefore, according to the electromagnetic ultrasonic probe 1A according to the present embodiment, it is possible to efficiently perform a flaw detection in a plurality of parts.

  Further, according to the electromagnetic ultrasonic probe 1A according to the present embodiment, similarly to the electromagnetic ultrasonic probe 1 according to the first embodiment, the sheet body 3A can be wound and wound by operating the winding switch and the winding release switch. The winding state can be released. Therefore, it is not necessary for the operator to directly wrap the sheet 3A around the flaw detection material 10A or to remove it from the flaw detection material 10A, so that the burden on the operator can be reduced.

FIG. 1 is a perspective view of the internal structure of the electromagnetic ultrasonic probe according to the first embodiment in which a flaw detection material is inserted. FIG. 2 is a side view of the electromagnetic ultrasonic probe according to the first embodiment, in which a flaw detection material is inserted. FIG. 3 is a side view of a part of the sheet body and the winding mechanism portion. FIG. 4 is an exploded perspective view of the sheet body. FIG. 5 is a side view of the electromagnetic ultrasonic probe when the inspection material is inserted inside the winding portion and the state where the sheet body is wound around the inspection material is released. FIG. 6 is a side view of the winding mechanism for applying a tensile force to both ends in the longitudinal direction of the sheet body, the magnetizing coil, and the sheet body. FIG. 7 is an end view of the electromagnetic ultrasonic probe according to the second embodiment in which the electromagnetic ultrasonic probe according to the second embodiment is cut so as to cut the sheet body. FIG. 8 is a side view of the electromagnetic ultrasonic probe according to the second embodiment, viewed from the direction of arrow Z in FIG. FIG. 9 is a diagram illustrating the operation of the support member when the winding switch is operated. FIG. 10 is a diagram illustrating the operation of the support member when the winding release switch is operated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A ... Electromagnetic ultrasonic probe 2, 2A ... Magnetization coil 23, 23A ... Opening part 3, 3A ... Sheet | seat body 34a ... Serpentine coil for transmission, 36a ... Serpentine coil for reception 4, 4A ... Winding mechanism, 41 ... guide, 42, 42A ... drive motor, 5 ... housing, 10, 10A ... flaw detection material

Claims (2)

An electromagnetic ultrasonic probe for flaw detection of a cylindrical or cylindrical inspection object,
A magnetizing coil surrounding the flaw detection material;
A flexible sheet that is disposed in the magnetizing coil and includes a meandering coil for transmitting and receiving ultrasonic waves, and is wound around an outer peripheral surface of the flaw detection material;
A winding mechanism for supporting the sheet body and for applying a tensile force to at least one end in the longitudinal direction of the sheet body;
The magnetizing coil has an opening,
The winding mechanism is disposed on the outside of the magnetizing coil, the guide for guiding at least one end of the sheet body to the outside of the magnetizing coil through the opening, and the guide A drive motor for applying a tensile force to the end portion of the sheet member guided to the outside of the magnetizing coil by a portion, and applying the tensile force to the sheet member during flaw detection, Is wound around the material to be inspected, and the state in which the sheet body is wound around the material to be inspected is released by releasing the tensile force applied to the sheet body after the flaw detection. Transducer. The electromagnetic ultrasonic probe according to claim 1, wherein the magnetizing coil and the winding mechanism are integrally formed.

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