JP2009008549A - Nondestructive inspection jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily apply nondestructive inspection of a certain secured accuracy and reproducibility in a short time to a piping bend section and straight tube sections before and behind it. <P>SOLUTION: A probe holder 21 equipped with a probe for carrying out nondestructive inspection of the piping can move in the longitudinal direction and circumferential direction of the piping bend section 12 and piping straight tube section 13. A first link 18 is supported at a support end of a piping fixed section 17 and is turnable at a scanning fulcrum position of the longitudinal direction of the piping bend section 12, and a second link 19 is turnable at a joint section 25 with the first link 18 and at a free end 26 with the probe holder holding part 21. When the probe holder holding part 20 turns in the longitudinal direction of the piping bend section 12, the second link 19 is guided by a turn guide section 28 and moves in the longitudinal direction of the piping bend section 12, and a lock mechanism section 30 locks the turn between the probe holder holding part 20 and the second link 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a nondestructive inspection jig for mounting a probe and scanning the surface of an inspection object to inspect the inspection object from the outside.

  Piping such as a drain line of a power plant has a bend (bent portion) and changes the direction of the fluid flowing through the piping. The pipe bend easily undergoes internal thinning due to erosion / corrosion or the like, and internal fluid may leak as the internal thinning progresses.

  Erosion-corrosion is a thinning phenomenon caused by the interaction between erosion due to mechanical action and corrosion due to chemical action, similar to corrosion fatigue. Erosion is a phenomenon in which a surface is mechanically damaged due to repeated collision of a fluid with a material, and a part of the surface is detached. Corrosion refers to all damage chemically received by erosion.

  For the thinning phenomenon caused by erosion / corrosion, thinning control is performed by measuring the wall thickness of the fixed point of the pipe using ultrasonic waves, but the bend part of the small-diameter pipe is accurate due to its curvature shape. It is difficult to obtain certain flaw detection results. In particular, when the bend portion of the small-bore pipe is formed of a socket elbow, the socket elbow has a complicated external shape, and therefore, the fender is hardly flawed. In view of this, usually, the test results of the most recent straight pipe portion are substituted and the thinning of the bend portion is evaluated.

  Here, to detect flaws in pipe bends, a trajectory is set on a pipe including an elbow, a moving body is moved along this trajectory, and a flaw detection arm is arranged in a direction crossing the trajectory of the moving body. There is one that is attached so as to be rotatable in a plane perpendicular to the surface to be inspected (see Patent Document 1). This flaw detection apparatus obtains the distance of the probe with reference to the weld line between the straight pipe of the pipe and the elbow, and performs flaw detection while specifying the flaw detection position of the elbow.

In addition, a plurality of segments that can be arranged in a curved line along the outer surface of the bent portion of the pipe to be flaw-detected are connected in a state that allows operation within a certain angle range by the connecting portion, and at least one of the segments There is an eddy current probe for inspecting a crack of a pipe by eddy current, and a pipe is inspected while a segment is running in contact with the outer surface of the pipe (for example, see Patent Document 2).
JP-A 61-223510 JP 2005-156184 A

  However, in the thing of patent document 1, although a straight pipe part and a bend part can be inspected, it is difficult to apply to a bend part of a small-diameter pipe because the structure is complicated, or in order to inspect a straight pipe part long. In addition, if the flaw detection arm is lengthened, the inspection distance in the axial direction at the bend portion is shortened, and there is a possibility of overlooking local inner wall thinning. Note that it is difficult to inspect all the regions in the axial direction of 90 ° structurally.

  Moreover, in the thing of patent document 2, when scanning the pipe bend part outer surface (back surface), it is necessary to install two probes in an opposing position, an apparatus becomes large and difficult to handle, and the movement to an axial direction is assumed. Therefore, it is not a structure that can always move in the circumferential direction. Further, when moving in the circumferential direction, it is necessary to slide the wheel in the circumferential direction. If the wheel is made into a sphere, it can move in the circumferential and axial directions, but in such a case, when moving in the axial direction, the deviation in the circumferential direction is not guaranteed, so a subtle shift occurs for each inspection, There is no guarantee that the same location can be inspected.

  Therefore, the present applicant straddles the probe holder holding portion holding the probe holder to which the probe is mounted by bringing the probe into contact with the outer peripheral surface of the pipe across the bend portion of the pipe. The probe is slid and scanned in the longitudinal direction of the outer peripheral surface of the bend part of the pipe and is also slid and scanned in the circumferential direction of the bend part of the pipe. On the other hand, a nondestructive inspection jig and apparatus capable of easily performing nondestructive inspection in a short time have been developed (Japanese Patent Application No. 2006-35412).

  However, although the non-destructive inspection of the longitudinal direction and the circumferential direction of the bend part of the pipe can be performed, the straight pipe part before and after the pipe bend part cannot be non-destructively inspected. Therefore, in order to perform non-destructive inspection of the straight pipe section downstream of the pipe bend section, inspection of the pipe straight pipe section must be performed separately from the inspection of the pipe bend section, which increases the amount of work for non-destructive inspection. become. For example, standards such as the Japan Society of Mechanical Engineers (JSME) may determine the inspection location of the pipe bend part and its downstream straight pipe part, and perform nondestructive inspection of the pipe bend part and its downstream straight pipe part. It is desirable to be able to do it simply.

  An object of the present invention is to provide a nondestructive inspection jig capable of performing a reproducible nondestructive inspection which ensures a certain accuracy in a short time with respect to a pipe bend portion and a straight pipe portion before and after the pipe bend portion. Is to provide.

  The nondestructive inspection jig according to the first aspect of the present invention includes a probe holder holding portion holding a probe holder for mounting a probe for nondestructive inspection of a pipe, and a front and back straddling the pipe bend portion. A pipe fixing part that is in contact with the outer peripheral surface of the pipe and fixed by a fixing member in the straight pipe part of the pipe, and rotates to the pipe fixing part so that one end is a scanning fulcrum position in the longitudinal direction of the pipe bend part. A first link that is freely supported, and a second link having one end rotatably attached to the other end of the first link and the other end rotatably attached to the probe holder holding portion. When the link and the probe holder holding part rotate in the longitudinal direction of the pipe bend part, they engage with a guide sliding part provided at the other end of the second link and the other of the second link. A rotation guide part for guiding the longitudinal movement of the pipe bend part at the end, and the probe When the child holder holding part is located at the pipe bend part, the rotation between the probe holder holding part and the second link is locked, and the probe holder holding part is positioned at the pipe bend part. And a lock mechanism section that permits rotation between the probe holder holding section and the second link when removed.

  The nondestructive inspection jig according to the invention of claim 2 is the invention according to claim 1, wherein when the probe holder holding part is located at the pipe bend part, the pipe fixing part and the first link The support end portion of the tube is rotated as a scanning fulcrum, and the probe holder holding portion is slid and scanned in the longitudinal direction of the outer peripheral surface of the pipe bend portion, while the probe holder holding portion is moved to the pipe bend. When the position of the portion is off, the support end with the first link is a scanning fulcrum, the joint between the first link and the second link is a pivot fulcrum, the second link and the A free end portion with the probe holder holding portion serves as a rotation fulcrum, and the probe holder holding portion is slidably scanned in the longitudinal direction of the outer peripheral surface of the pipe straight pipe portion.

  According to a third aspect of the present invention, in the nondestructive inspection jig according to the first or second aspect of the invention, the probe holder holding portion is configured to slide the probe holder in the circumferential direction of the outer peripheral surface of the pipe. The probe holder is configured to be held so as to be possible.

  According to the present invention, the first link that is rotatably attached to the pipe fixing portion and the second link that is rotatably attached to the probe holder holding portion are rotatably attached. By using the second link and the second link, the probe holder holding portion can be slid and scanned in the longitudinal direction and the circumferential direction toward the rotation center in the pipe bend portion, and the pipe straight pipe portion is also searched within a predetermined length range. The contact holder holder can be slid and scanned in the longitudinal direction and the circumferential direction. In addition, it is possible to perform high-precision inspection at the same level by setting the inspection jig once in the pipe without depending on the inspection skill of the inspector.

  FIG. 1 is a configuration diagram when an ultrasonic nondestructive inspection apparatus having an ultrasonic probe mounted on a nondestructive inspection jig according to an embodiment of the present invention is applied to a pipe bend, and FIG. FIG. 3 is a structural view of a region to be examined, FIG. 3 is an arrow view seen from the direction of arrow A1 in FIG. 1, and FIG.

  In FIG. 2, the inspection target part of the nondestructive inspection in the embodiment of the present invention shows a case where the pipe bend part is the socket elbow 11, the bend part 12, and the front and rear straight pipe parts 13. The socket elbow 11 has a bend portion 12 for changing the flow direction of fluid and a socket portion 14 for connecting to other piping, and the socket portion 14 and a straight pipe portion 13 of other piping are connected by a welded portion 15. Has been. And the back side of the bend part 12 of the socket elbow 11, the bend part 12, and the front and rear straight pipe parts 13 are inspection target parts, and the longitudinal direction (arrow S <b> 1 direction) on the back side of the bend part 12 and the straight pipe part 13. A non-destructive inspection is performed by scanning a probe described later in the longitudinal direction (arrow S2). Further, as shown in FIG. 4, the probe described later is also scanned in the circumferential direction (arrow S3 direction) of the outer peripheral surface of the bend portion 12 and the circumferential direction (arrow S4 direction) of the outer peripheral surface of the straight pipe portion 13. Perform nondestructive inspection.

  As shown in FIG. 1, the nondestructive inspection jig 16 can move in the longitudinal direction (arrows S1 and S2 directions) of the outer peripheral surface of the socket elbow 11 that is the inspection target part and the pipe straight pipe portion 13 before and after the socket elbow 11. These are mounted on the outer peripheral surface of the straight pipe portion 13 before and after the socket elbow 11.

  That is, the non-destructive inspection jig 16 has a probe holder holding part 20 attached to the pipe fixing part 17 via the first link 18 and the second link 19, and the probe holder holding part 20 has a probe. The probe holder 21 to which the probe is attached is held.

The pipe fixing portion 17 is formed in a substantially L shape so that each tip end portion is located at a predetermined position of the pipe straight pipe portion 13 before and after the bend portion 12 and the socket portion 14 of the socket elbow 11. The parts are provided with fixtures 22a and 22b. The fixtures 22a and 22b abut against the outer peripheral surface of the pipe straight pipe portion 13 and are fixed to the pipe by the fixing members 23a and 23b.

  That is, the fixtures 22a and 22b of the pipe fixing portion 17 are brought into contact with the outer peripheral surface of the pipe straight pipe portion 13 across the bend portion 12 and the socket portion 14 of the socket elbow 11, and the fixtures 22a and 22b are fixed to the fixing member 23a. , 23b. Although FIG. 1 shows a case where a fixing band is used as the fixing members 23a and 23b, screws may be used as the fixing members 23a and 23b, and the fixtures 22a and 22b may be stopped with screws.

  One end of the first link 18 is rotatably supported by the pipe fixing portion 17 by a support end portion 24, and the other end is rotatably attached by a second link 19 and a joint portion 25. The support end 24 of the first link 18 and the pipe fixing part 17 is located at the scanning fulcrum position in the longitudinal direction of the bend part 12 of the socket elbow 11 when the pipe fixing part 17 is attached to the straight pipe part 13 of the pipe. It becomes.

  Further, the other end of the second link 19 is rotatably attached by a probe holder holding part 20 and a free end part 26. A guide sliding portion 27 is provided at the other end of the second link 19. The guide sliding portion 27 is guided by the rotation guide portion 28 provided at the bent portion of the pipe fixing portion 17, and moves the other end of the second link 19 in the longitudinal direction of the bend portion 12 of the socket elbow 11. It is something to be made.

  Further, the probe holder holding part 20 is provided with a lock mechanism part 30. The lock mechanism unit 30 locks the rotation between the probe holder holding unit 20 and the second link 19 when the probe holder holding unit 20 is positioned on the pipe bend unit 12, and the probe holder When the holding part 20 is out of the position of the pipe bend part 13, the lock between the probe holder holding part 20 and the second link 19 is released.

  When the lock mechanism 30 is locked (when the probe holder holding portion 20 is positioned on the pipe bend portion 12), the joint portion 25 between the first link 18 and the second link 19 is used. Is also locked. This is because the guide sliding portion 27 of the second link 19 moves while being guided by the rotation guide portion 28, and the moving direction of the other end of the second link 19 is in the longitudinal direction of the bend portion 12 of the socket elbow 11. It is because it is restrained. That is, in a state where the first link 18 and the second link 19 overlap each other, the first link 18 and the second link 19 rotate in conjunction with each other at the support end 24. On the other hand, in the unlocked state, the joint portion 25 between the first link 18 and the second link 19 is rotatable. FIG. 1 shows a state in which the lock is released. Details of the lock mechanism will be described later.

  Next, as shown in FIG. 3, the probe holder holding portion 20 is formed in a fan shape, guided by the guide hole 29 of the fan portion, and the probe holder 21 to which the probe 34 is attached is connected to the socket elbow. 11 can be slidably scanned also in the circumferential direction (arrow S3, S4 direction) of the outer peripheral surface of the bend portion 12 and the pipe straight pipe portion 13. Therefore, the probe holder 21 held by the probe holder holding portion 20 is arranged in the circumferential direction of the outer peripheral surface of the bend portion 12 of the socket elbow 11 and the peripheral direction of the outer peripheral surface of the pipe straight pipe portion 13 (arrows S3 and S4). The probe 34 can also detect flaws in the circumferential direction of these outer peripheral surfaces.

  FIG. 3 shows a case where the probe holder holding part 20 is located on the pipe bend part 12. In this state, the guide sliding part 27 on the other end of the second link 19 is provided on the pipe fixing part 17. Guided by the rotation guide portion 28, the other end of the second link 19 is moved and guided. In this state, the locking mechanism 30 locks between the probe holder holding part 20 and the second link 19, and the free end part 26 between the second link 19 and the probe holder holding part 20. Lock the rotation.

  FIG. 5 is a side view of the second link 19. The second link 19 is formed at one end with a joint portion 25 that is pivotably attached to the first link 18, and at the other end is a free end portion that is pivotally attached to the probe holder holding portion 20. 26 is formed. In the vicinity of the free end portion 26 of the second link 19, a guide sliding portion 27 that engages with the rotation guide portion 28 provided in the pipe fixing portion 17 is provided. A lock hole 31 into which the lock pin is inserted is provided.

  FIG. 6 is a detailed view of the lock mechanism 30 between the probe holder holding part 20 and the second link 19, and FIG. 6A shows a locked state (the probe holder holding part 20). 6 (b) is an explanatory diagram of a state where the lock is released (a state where the probe holder holding unit 20 is out of the position of the pipe bend unit 12). is there.

  As shown in FIG. 6A, the lock mechanism portion 30 has a lock pin 32 and a spring 33. When the lock mechanism 32 is locked, one end of the lock pin 32 comes into contact with the rotation guide portion 28 and the spring. 33 is compressed, and the other end of the lock pin 32 is inserted into the lock hole 31 of the second link to lock the rotation of the second link 19 and the probe holder 20 at the free end portion 26. On the other hand, as shown in FIG. 6B, in the unlocked state, one end of the lock pin 32 is disengaged from the rotation guide portion 28 and the spring 33 is extended, and the other end of the lock pin 32 is the second end. The lock is released from the lock hole 31 of the link, and the lock between the second link 19 and the probe holder 20 at the free end portion 26 is released.

  FIG. 7 is an explanatory diagram of the operating state of the lock mechanism 30. FIG. 7 (a) is the unlocked state, FIG. 7 (b) is the transition state from the unlocked state to the locked state, and 7 (c). Indicates a locked state.

  When the probe holder holding portion 20 is out of the position of the pipe bend portion 12, the lock is released. As shown in FIG. 7A, one end of the lock pin 32 is the rotation guide portion. 28, the spring 33 is extended, and the other end of the lock pin 32 is pulled out from the lock hole 31 of the second link. In this released state, the free end portion 26 between the second link 19 and the probe holder 20 is in a rotatable state.

  When the probe holder holding part 20 reaches the vicinity of the position of the pipe bend part 12, as shown in FIG. 7B, one end of the lock pin 32 of the lock mechanism part 30 starts to contact the rotation guide part 28. When a force is applied to the lock mechanism 30 from the upper side to the lower side in FIG. 7B, one end of the lock pin 32 is formed in a taper shape, so that the lock mechanism unit 30 is in contact with the rotation guide unit 28 while sliding. It starts to move to the left in FIG. As a result, while compressing the spring 33, the other end of the lock pin 32 reaches the entrance of the lock hole 31 of the second link 19, and the lock mechanism 30 is further forced downward from the upper side of FIG. When added, as shown in FIG. 7C, the other end of the lock pin 32 is inserted into the lock hole 31 of the second link 19, and the one end of the lock pin 32 is locked to the rotation guide portion 28. . Thereby, it will be in a locked state.

  Next, the operation of the nondestructive inspection jig 16 will be described. FIG. 8 is a state diagram when the probe holder holding part 20 is located in the pipe bend part 12. First, the nondestructive inspection jig 16 is mounted in the vicinity of the socket elbow 11 that is the inspection target part. The non-destructive inspection jig 16 is attached to the outer surface of the pipe straight pipe part 13 connected to the bend part 12 of the socket elbow 11 by the pipe fixing part 17. At that time, the support end portion 24 between the pipe fixing portion 17 and the first link is arranged so as to be a scanning fulcrum position in the longitudinal direction of the pipe bend portion 12 of the probe holder holding portion 20.

  In this state, the rotation between the probe holder holding unit 20 and the second link 19 is locked by the lock mechanism unit 30, and the guide sliding unit 27 of the second link 19 is rotated by the rotation guide unit 28. The movement of the joint portion 25 between the first link 18 and the second link 19 is also locked.

  Therefore, when the probe holder holding part 20 is slid and scanned in the longitudinal direction of the outer peripheral surface of the pipe bend part 12, the support end part 24 of the pipe fixing part 17 and the first link 18 turns as a scanning fulcrum. To do. In this case, for example, an ultrasonic probe is attached to the probe holder 21, and flaw detection in the longitudinal direction of the outer peripheral surface of the pipe bend portion 12 is performed. Further, the probe holder 20 is moved in the circumferential direction of the pipe bend portion 12 along the guide hole 29 of the probe holder holding portion 20 to perform the flaw detection in the circumferential direction of the pipe bend portion 12.

  Next, in order to perform flaw detection on the straight pipe portion 13 of the pipe, the probe holder holding portion 20 is rotated and moved to the end portion of the pipe bend portion 12 as shown in FIG. Further, when the probe holder holding part 20 is further moved in the left direction of FIG. 9, the probe holder holding part 20 comes off the position of the pipe bend part 12. As a result, the lock of the lock mechanism 30 is released, and the guide sliding part 27 of the second link 19 is disengaged from the rotation guide part 28. Therefore, the probe holder holding part 20 and the second link 19 The free end portion 26 and the joint portion 25 between the first link 18 and the second link 19 can be rotated.

  Then, the probe holder holding part 20 is lifted to the upper left in FIG. 9, passes over the socket part 14, and the probe holder holding part 20 is positioned in the pipe straight pipe part 13 as shown in FIG. 1.

  In this state, when the probe holder holding portion 20 is slid and scanned in the longitudinal direction of the outer peripheral surface of the pipe straight pipe portion 13, the free end portion 26 between the probe holder holding portion 20 and the second link 19, The joint 25 between the first link 18 and the second link 19 rotates as a scanning fulcrum, and flaw detection in the longitudinal direction of the outer peripheral surface of the pipe straight pipe portion 13 is performed. Further, the probe holder 20 is moved in the circumferential direction of the pipe straight pipe portion 13 along the guide hole 29 of the probe holder holding portion 20 to perform the flaw detection in the circumferential direction of the pipe straight pipe portion 13. Nondestructive inspection can be performed on almost the entire area of the bend portion 12 and the straight pipe portion 13 of the socket elbow 11.

  Thus, when the probe holder holding portion 20 holding the probe holder 21 is positioned at the bend portion 12 of the socket elbow 11, the support end portion 24 between the pipe fixing portion 17 and the first link 18. The probe holder holding portion 20 holding the probe holder 21 enables the probe to slide on the outer peripheral surface in the longitudinal direction of the bend portion 12 of the socket elbow 11.

  Further, when the probe holder holding part 20 is located in the pipe straight pipe part 13, the support end part 24 between the pipe fixing part 17 and the first link 18, the first link 18 and the second link 19. The joint portion 25, the second link 19 and the free end portion 26 of the probe holder holding portion 20 allow the probe to slide on the outer peripheral surface in the longitudinal direction of the pipe straight pipe portion 13.

  Although the case where the pipe bend portion is the socket elbow 11 has been described in the above description, it is needless to say that the present invention can also be applied to a butt welding elbow. In addition, the support end 24 between the first link 18 and the pipe fixing portion 17, the joint portion 25 between the first link 18 and the second link 19, the second link 19 and the probe holder holding portion 20, A position detector that measures the amount of rotation is provided at the free end portion 26 of the sensor, and a position detector that measures the amount of movement of the guide hole 29 is provided at the probe holder holding portion 20, and detection signals from these position detectors are provided. May be input to the signal processing device to detect the moving position of the probe 34. The position detection signal from the position detector and the measurement data signal measured by the probe 34 are input to the signal processing apparatus, and the measurement data signal is made to correspond to the detection position of the pipe, thereby measuring the measurement data. Since flaw detection image data can be measured in association with the probe position, pipe flaw detection can be performed with high accuracy.

  According to the embodiment of the present invention, the non-destructive inspection jig 16 is attached to the pipe fixing part 17 at a predetermined position of the pipe straight pipe part 13 at both ends of the pipe bend part 12, and the first link 18 is attached to the pipe fixing part 17. Since the second link 19 is provided between the first link 18 and the probe holder holding portion 20, the flaw detection inspection is performed in a wide range not only in the pipe bend portion 12 but also in the pipe straight pipe portion 13. It can be performed. Further, since the probe holder holding part 20 can move the probe not only in the longitudinal direction of the pipe bend part 12 and the pipe straight pipe part 13 but also in the circumferential direction, flaw detection inspection can be performed over almost the entire region to be inspected. .

The block diagram at the time of applying the ultrasonic nondestructive inspection apparatus which equipped the ultrasonic probe to the nondestructive inspection jig concerning embodiment of this invention to a piping bend part. The structure figure of the inspection object part of the nondestructive inspection by the nondestructive inspection jig concerning an embodiment of the invention. The arrow line view seen from arrow A1 direction of FIG. The arrow view seen from the arrow B1 direction of FIG. The side view of the 2nd link in embodiment of this invention. The detailed view of the lock mechanism part between the probe holder holding | maintenance part and 2nd link in embodiment of this invention. Explanatory drawing of the operation state of the locking mechanism part in embodiment of this invention. The state figure in case the probe holder holding part in embodiment of this invention is located in a piping bend part. The state diagram in case the probe holder holding part in embodiment of this invention is located in the edge part of a piping bend part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Socket elbow, 12 ... Bend part, 13 ... Straight pipe part, 14 ... Socket part, 15 ... Welding part, 16 ... Nondestructive inspection jig, 17 ... Pipe fixing part, 18 ... First link, 19 ... First 2 links, 20 ... probe holder holding part, 21 ... probe holder, 22 ... fixture, 23 ... fixing member, 24 ... support end part, 25 ... joint part, 26 ... free end part, 27 ... guide Sliding part 28 ... Turning guide part 29 ... Guide hole 30 ... Lock mechanism part 31 ... Lock hole 32 ... Lock pin 33 ... Spring 34 ... Probe

Claims (3)

  A probe holder holding part that holds the probe holder to which a probe for nondestructive inspection of the pipe is attached, and the pipe bend part are in contact with the outer peripheral surface of the pipe by the front and rear pipe straight pipe parts. A pipe fixing portion fixed by a fixing member; a first link rotatably supported by the pipe fixing portion so that one end thereof is a scanning fulcrum position in the longitudinal direction of the pipe bend portion; and one end is A second link rotatably attached to the other end of the first link and the other end rotatably attached to the probe holder holding portion; and the probe holder holding portion is the pipe bend When rotating in the longitudinal direction of the part, it engages with a guide sliding part provided at the other end of the second link to guide the longitudinal movement of the pipe bend part at the other end of the second link. The rotation guide part and the probe holder holding part are located at the pipe bend part. When the probe holder holding portion and the second link are locked, the rotation of the probe holder holding portion is locked, and when the probe holder holding portion is out of the position of the pipe bend portion, the probe holder holding portion is held. A non-destructive inspection jig comprising: a lock mechanism portion that permits rotation between a portion and the second link.   When the probe holder holding part is located at the pipe bend part, the support end part of the pipe fixing part and the first link rotates as a scanning fulcrum, and the probe holder holding part Is moved in the longitudinal direction of the outer circumferential surface of the pipe bend, and when the probe holder holding part is out of the position of the pipe bend, the support end with the first link is scanned. The fulcrum, the joint between the first link and the second link serves as a pivot fulcrum, and the free end between the second link and the probe holder holding part serves as a pivot fulcrum. The nondestructive inspection jig according to claim 1, wherein the contact holder holding part is slid and scanned in the longitudinal direction of the outer peripheral surface of the pipe straight pipe part.   The probe holder holding portion is configured to hold the probe holder so that the probe holder can slide and scan in the circumferential direction of the outer peripheral surface of the pipe. The nondestructive inspection jig according to claim 1 or 2.

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