JP2010060477A - Implement for pipe inspection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an implement for pipe inspection fixable to a pipe in a short time and usable for inspecting a bent pipe. <P>SOLUTION: This implement 10 for inspection with its sensor moved along the axial direction of a bent pipe P includes a fixation part 20 mounted on a rectilinear pipe positioned in the vicinity of a bend part PB of the pipe P, a rocking arm 30 connected to the fixation part 20, and a holding part 40 provided on the rocking arm 30 for holding the sensor. The rocking arm 30 is connected to the fixation part 20 so as to be rockable along the axial direction of the bend part PB of the pipe P with the fixation part 20 mounted on the rectilinear pipe. The fixation part 20 is mounted on the rectilinear pipe so that the rocking center of the rocking arm 30 is positioned at the curvature center BS of a center axis of the bend part PB of the pipe P. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a pipe inspection jig. Oil refineries, petrochemical plants, power plants, and the like are provided with a large number of pipes through which fluids such as high-temperature process fluids and superheated steam flow. If such piping is damaged, the plant equipment stops and production of the product cannot be performed. In the worst case, an accident occurs. In order to prevent the problems as described above and detect damage to the piping at an early stage, it is necessary to periodically perform maintenance and inspection of the piping.
The present invention relates to a pipe inspection jig used for maintenance and inspection of such pipes.

As an inspection method for detecting local corrosion in piping of an oil refinery plant or the like, an inspection method using ultrasonic waves is known (Patent Documents 1 and 2).
Patent Documents 1 and 2 disclose a method of inspecting local corrosion of a pipe by moving an ultrasonic probe along the axial direction of the pipe with a jig fixed to the pipe. According to these methods, since the ultrasonic probe is moved along the axial direction of the pipe, the thickness of the pipe can be continuously measured along the axial direction of the pipe. It can be detected even with thinning.

By the way, in the above method, in order to continuously measure the pipe thickness, a jig for moving the probe must be fixed to the pipe.
However, the jigs described in Patent Documents 1 and 2 have a complicated structure for fixing to a pipe, and it takes time to fix the jig, so that the work time for the entire inspection becomes longer. Then, since the heat insulator must be removed from the piping for a long time, there is a possibility of affecting the operation of the plant equipment.

JP 2007-212406 A JP2007-285772

  In view of the above circumstances, an object of the present invention is to provide a pipe inspection jig that can be fixed to a pipe in a short time and can be used for inspection of a bent pipe.

The inspection jig of the first invention is an inspection jig for moving the sensor along the axial direction of the bent pipe, and a fixing portion attached to a straight pipe located near the bent portion of the pipe; The swing arm includes a swing arm connected to the fixed portion, and a holding portion that is provided on the swing arm and holds the sensor. The swing arm has the fixed portion attached to the linear pipe. The fixed portion is connected to the fixed portion so as to be swingable along the axial direction of the bent portion of the pipe, and the fixed portion is configured such that the swing center of the swing arm has a curvature of the bent portion of the pipe. It is attached to the said linear piping so that it may be located in the center, It is characterized by the above-mentioned.
The inspection jig according to a second aspect of the present invention is the inspection jig according to the first aspect, wherein the fixed portion has a base end attached to the linear pipe so as to be in a cantilever state, and a swing arm is connected to the tip end. It is characterized by.
The inspection jig according to a third aspect of the present invention is the inspection frame according to the first or second aspect, wherein the fixing part includes an engagement frame including a pipe housing part having an arcuate cross section having substantially the same diameter as the outer diameter of the linear pipe. A movable frame that holds the linear pipe between the engagement frame and the engagement frame, and the movable frame is attached to the linear pipe with respect to the engagement frame. The base end of the straight pipe is swingably connected to one end in the circumferential direction of the engagement frame so as to be able to approach and separate from the radial direction of the straight pipe. A connecting means for connecting and releasing the two is provided between the ends.
The inspection jig according to a fourth aspect of the present invention is the inspection jig according to the first, second, or third aspect, wherein the swing arm has a base end connected to the fixing portion and the fixing portion attached to the linear pipe. In this state, the tip portion connected to the base end portion and the fixing means for fixing and releasing the swing of the tip end portion with respect to the base end portion so as to be swingable along the radial direction of the linear pipe It is characterized by the following.
The inspection jig according to a fifth aspect of the invention is the first, second, third or fourth aspect of the invention, wherein the holding portion is capable of holding a plurality of the sensors, and the fixing portion is attached to the linear pipe. In this state, the plurality of sensors are held at positions shifted from each other in the circumferential direction of the bent portion of the pipe.
The inspection jig of a sixth invention is characterized in that, in the first, second, third or fourth invention, a plurality of the holding parts are provided, and a sensor is provided in each holding part. To do.

According to the first invention, the connecting portion between the swing arm and the fixed portion is positioned at the center of curvature of the central axis of the bent portion of the pipe, so that the swing arm can be operated with the ultrasonic probe in contact with the pipe. By swinging, the ultrasonic probe can be moved in the axial direction along the pipe surface while maintaining the contact state between the ultrasonic probe and the pipe surface constant. Therefore, it is possible to accurately inspect the state of the piping with less error due to the measurement position.
According to the second aspect of the invention, since the fixing portion is attached to the straight pipe so as to be in a cantilever state, the degree of freedom of attachment to the pipe can be increased, and attachment to the pipe is facilitated.
According to the third invention, the fixing portion can be fixed to the straight pipe simply by engaging the engaging frame with the pipe and connecting the tip of the movable frame and the other end of the engaging frame by the connecting means. . Then, since the time required for installation of the jig is shortened, and the inspection preparation time is also shortened accordingly, it is possible to shorten the time for removing the heat insulator from the pipe. Therefore, even if the pipe to be inspected is a high-temperature pipe, the inspection can be performed without stopping the plant equipment. In addition, since the pipe housing portion of the engagement frame is formed in a cross-sectional arc shape having substantially the same diameter as the outer diameter of the straight pipe, the engagement frame is engaged with the pipe if the straight pipe is horizontal. Since the jig can be stably placed on the pipe simply by combining them, the jig can be easily installed and removed.
According to the fourth aspect of the present invention, the swinging of the distal end portion relative to the proximal end portion can be fixed and released by the fixing means. Then, if the tip part is swung away from the pipe, the rocking arm can be prevented from getting in the way when the jig is installed on the pipe. It is possible to prevent wobbling of the part.
According to the fifth aspect of the present invention, the positions shifted from each other in the circumferential direction of the bent portion can be measured at a plurality of locations at the same time, so that the inspection work time can be shortened.
According to the sixth aspect of the present invention, the positions shifted from each other in the circumferential direction of the bent portion can be measured at a plurality of locations at the same time, so that the inspection work time can be shortened.

Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic explanatory diagram of a state in which the inspection jig 10 of the present embodiment is attached to a pipe P. FIG. 2 is a schematic explanatory diagram of a situation where the bent portion PB of the pipe P is inspected by the inspection jig 10 of the present embodiment. As shown in FIGS. 1 and 2, the inspection jig 10 of the present embodiment holds a sensor for inspecting a pipe P such as an ultrasonic probe S, an eddy current flaw sensor, and a non-contact thermometer. This is a jig used when the sensor is moved along the axial direction of a bent portion PB (see FIG. 5, hereinafter referred to as a bent portion PB) in the pipe P.

As shown in FIG. 1 and FIG. 2, the inspection jig 10 of the present embodiment includes a fixing part 20 attached to a straight pipe PS (hereinafter referred to as a straight pipe part PS) of the pipe P, and the fixing part 20. The swinging arm 30 is connected to the swinging arm 30 and the holding unit 40 is provided on the swinging arm 30. Before explaining the details of the inspection jig 10 of this embodiment, First, the usage state of the inspection jig 10 of this embodiment will be described.
In addition, the sensor attached to the inspection jig 10 is not particularly limited, but in the following, as a representative, the pipe P is inspected by the ultrasonic probe S that performs the thickness inspection of the pipe P, that is, the pipe P thinning inspection. The case where it does is demonstrated.

As shown in FIG. 1 and FIG. 2, when an inspection is performed using the ultrasonic probe S held by the inspection jig 10 of the present embodiment, first, the bending to be inspected in the pipe P is performed. The fixing part 20 is fixed to the straight pipe part PS located in the vicinity of the part PB. At this time, the fixed portion 20 is disposed so that the center of curvature BS (see FIG. 5) of the bent portion PB is positioned on the shaft 24 on which the swing arm 30 swings. When the fixing part 20 is fixed to the straight pipe part PS, the holding part 40 brings the ultrasonic probe S into a state where the sensor part (the part for transmitting and receiving ultrasonic waves) is in contact with the surface of the bent part PB. Arrange as follows.
When the placement of the ultrasonic probe S is completed, the swing arm 30 is swung while transmitting ultrasonic waves from the ultrasonic probe S. Then, the center of curvature of the bent portion PB is positioned on the shaft 24 that swings the swing arm 30, and the contact point between the ultrasonic probe S and the pipe P includes the shaft 24 and the bent portion PB. Since the ultrasonic probe S is always provided on the surface SF4 orthogonal to the central axis (see FIG. 4), the ultrasonic probe S is in contact with the surface of the bending portion PB while being in contact with the surface of the bending portion PB. (See FIGS. 2 and 5).
Therefore, if the inspection jig 10 of this embodiment is used, the ultrasonic probe S can be moved along the axial direction of the bent portion PB, so that the thinning state of the pipe P can be inspected. It can be done.

  Next, the structure of the inspection jig 10 of this embodiment will be described.

First, the fixing unit 20 will be described.
In FIG. 1 and FIG. 2, reference numeral 21 indicates an engagement frame of the fixing portion 20. The engagement frame 21 is attached to the straight pipe portion PS that is continuous with the bent portion PB, which is a portion to be inspected, in the pipe P. This engagement frame 21 is formed in an arc shape by bending a rod-shaped member, and is formed so that the curvature radius CR1 (CC1 is the center of curvature) of the inner surface 21s thereof is substantially the same as the radius RS of the straight pipe portion PS. (See FIG. 4).
For this reason, if the engagement frame 21 is engaged with the straight pipe part PS, the engagement frame 21 can be hooked on the straight pipe part PS.

  In FIG. 1, a space formed below the engagement frame 21, that is, a semicircular space surrounded by the inner surface 21 s of the engagement frame 21 corresponds to the pipe housing portion referred to in the claims. .

  Further, the engagement frame 21 is not limited to the case where the rod-like member is bent as described above, and the engagement frame 21 is formed by bending a plate-like member as long as it has a pipe accommodating portion having a circular arc-shaped space. There is no particular limitation. However, as shown in FIG. 1, if the rod-shaped member is formed by bending, the engagement frame 21 can be reduced in weight, so that the burden on the pipe P when the inspection jig 10 is attached can be reduced.

As shown in FIGS. 1 and 2, the fixed portion 20 includes a movable frame 22 provided so that the straight pipe portion PS can be sandwiched between the fixed portion 20 and the engaging frame 21. The movable frame 22 has a base end (left end in FIG. 1) connected to one end in the circumferential direction of the engagement frame 21 so as to be swingable.
Specifically, as shown in FIG. 3, in a state where the engagement frame 21 is hooked on the straight pipe portion PS, the movable frame 22 can approach and separate from the engagement frame 21 from the radial direction of the straight pipe portion PS. Thus, the base end of the movable frame 22 is connected to one end of the engagement frame 21.

Further, as shown in FIG. 1, the fixed portion 20 includes connection means 23 that connects the tip of the movable frame 22 and the other end of the engagement frame 21. The connecting means 23 includes a hook F provided at the tip of the movable frame 22 and a hook member T provided at the other end of the engagement frame 21.
For this reason, if the engaging member T of the engagement frame 21 is hooked and fixed to the hook F of the movable frame 22, the movable frame 22 can be moved in a state where the straight pipe portion PS is sandwiched in the space between the engagement frame 21. It can be fixed to the frame 22 and can be fixed to the fixing portion 20 to the straight pipe portion PS.

  A pair of stays 22s and 22s are provided on the surface of the movable frame 22 on the side of the engagement frame 21. When the pair of stays 22 s and 22 s connect the tip of the movable frame 22 and the other end of the engagement frame 21 by the connecting means 23, the tip surface is positioned on the circumference extending the inner surface of the engagement frame 21. It is provided to do. That is, the engagement frame 21 is provided so as to be located on a circumference having a radius having the same length as the curvature radius CR1 with the center of curvature CC1 of the inner surface 21s of the engagement frame 21 as the center. Then, when the fixing portion 20 is attached to the straight pipe portion PS, the tip surfaces of the pair of stays 22s and 22s are in contact with the outer peripheral surface of the straight pipe portion PS, so that the fixing portion 20 is stabilized to the straight pipe portion PS. Can be fixed. Moreover, since the outer peripheral surface of the straight pipe portion PS is in surface contact with the tip surfaces of the pair of stays 22s and 22s, even if the fixing portion 20 is fixed to the straight pipe portion PS, the straight pipe portion PS is prevented from being damaged. Can do.

As shown in FIGS. 1 and 2, a shaft 24 is rotatably provided at the lower end of the movable frame 22.
As shown in FIG. 4, the shaft 24 is a surface SF1 (in other words, orthogonal to the central axis of the semicircular space surrounded by the engagement frame 21 when the fixing portion 20 is attached to the straight pipe portion PS. The straight pipe portion PS is disposed so as to be positioned on a surface SF2 parallel to the surface SF1) orthogonal to the central axis of the straight pipe portion PS. Moreover, when the fixing portion 20 is attached to the straight pipe portion PS, the distance DS1 from the intersection CP1 of the central axis of the straight pipe portion PS and the surface SF2 to the shaft 24 has the same length as the curvature radius R of the bent portion PB. It is arranged like this.

An encoder E for detecting the rotation angle of the shaft 24 is connected to the base end of the shaft 24, and a base end of a swing frame 30 described later is fixed to the tip of the shaft 24.
Therefore, if the swing arm 30 is swung about the shaft 24 as a fulcrum, the ultrasonic probe S can be moved in the axial direction of the bent portion PB. In addition, since the swing angle of the swing arm 30 can be detected by the encoder E, if the signal from the encoder E and the signal from the ultrasonic probe S are stored in synchronization, the ultrasonic probe is stored. The inspection position of the child S can be specified accurately. Specifically, with the surface SF2 (see FIG. 4) perpendicular to the central axis of the straight pipe portion PS and including the central axis of the shaft 24 (see FIG. 4) as a reference surface, the rotation angle with respect to this reference surface is determined by the encoder E. If the signal of the encoder E and the inspection result by the ultrasonic probe S are stored in association with each other, the position where the inspection result of the ultrasonic probe S is obtained can be accurately and easily specified. Can do.

  In addition, it connects with rotation means, such as a motor, at the base end of the axis | shaft 24, and you may make it detect the rotation angle of the main axis | shaft etc. of this motor by attaching the encoder E to the main axis | shaft etc. of this motor. In this case, if the rotating means 25 is driven, the shaft 24 can be rotated, and the swing arm 30 can be swung as the shaft 24 rotates, so that the ultrasonic probe S is automatically operated. Can be moved in the axial direction of the bent portion PB.

  Further, the shaft 24 may be arranged so as to be positioned on the above-described surface SF1, but as described above, it is positioned on a surface parallel to the surface SF1 and shifted along the central axis direction of the straight pipe portion PS. It is preferable to dispose the shaft 24 in the case because there are the following advantages. That is, if it is set as the structure mentioned above, the fixing | fixed part 20 can be fixed to the position (for example, the position away from the connection part of the straight pipe part PS and the bending part PB etc.) easy to fix in the straight pipe part PS. Therefore, the fixing part 20 can be easily fixed, and the fixing part 20 can be fixed to the straight pipe part PS in a more stable state. The surface SF2 on which the shaft 24 is disposed is only required to be disposed in parallel with the surface SF1, and the surface SF2 is placed on the bent portion PB side with respect to the surface SF1 as in the inspection jig 10 of the present embodiment. Alternatively, the surface SF2 may be disposed on the side opposite to the bent portion PB with respect to the surface SF1. That is, the shaft 24 may be appropriately set so as to satisfy the above conditions according to the state of the pipe P where the inspection jig 10 of the present embodiment is installed.

Next, the swing frame 30 will be described.
As shown in FIGS. 1 and 2, the base end of the swing frame 30 is fixed to the tip of the shaft 24. The swing arm 30 includes a base end portion 31 connected to the shaft 24 and a tip end portion 32 connected to the base end portion 31.
As shown in FIG. 1, the distal end portion 32 is a member formed in an arc shape. As shown in FIG. 4, the distal end portion 32 is formed such that the center of curvature CC2 of the inner end surface thereof is located on a surface SF3 that is parallel to the surface SF4 that includes the shaft 24 and is orthogonal to the central axis of the bent portion PB. Yes. Moreover, the inner end surface 32s of the tip end portion 32 has a radius of curvature CR2 larger than the radius RB of the bent portion PB, and the center of curvature CC2 is projected onto the surface SF4 along the normal direction of the surface SF4. The distance DS2 from the point CP2 to the shaft 24 is formed to have the same length as the radius of curvature R of the bent portion PB. That is, the inner end surface 32s of the tip end portion 32 is formed so that the point CP2 coincides with the intersection point of the surface SF4 and the central axis of the bent portion PB.

Next, the holding unit 40 will be described.
As shown in FIGS. 1 and 2, a holding portion 40 is attached to the distal end portion 32 of the swing arm 30. The holding unit 40 includes a moving frame 42 provided so as to be movable along the distal end portion 32, and a sensor holding unit 41 connected to the moving frame 42.
As shown in FIGS. 1 and 2, the sensor holding unit 41 holds an ultrasonic probe S that is a sensor for inspecting the pipe P. Specifically, in the sensor holding portion 41, the contact point between the ultrasonic probe S and the pipe P (the contact point between the ultrasonic probe S and the bent portion PB in FIG. 4) includes the shaft 24. The ultrasonic probe S is held so as to be positioned on the surface SF4 orthogonal to the central axis of the bent portion PB (see FIG. 4). The sensor holding unit 41 also includes a mechanism for adjusting the contact state between the ultrasonic probe S and the pipe P.
Further, as shown in FIGS. 1 and 2, the moving frame 42 is provided so as to be fixedly movable with respect to the distal end portion 32 of the swing arm 30. When the fixing to the distal end portion 32 is released, the movable arm 30 is configured to be movable in the circumferential direction of the distal end portion 32 of the swing arm 30, that is, around the center of curvature of the inner end face 32 s of the distal end portion 32.

  Note that the distal end portion 32 may be provided such that the center of curvature CC2 of the inner end surface thereof is located on the surface SF4 in FIG. That is, the tip end portion 32 and the holding portion 40 may be arranged so that the surface SF4 and the surface SF3 in FIG. However, as shown in FIG. 4, if the surface SF4 and the surface SF3 are separated from each other, it is easy to adjust the position of the ultrasonic probe S or the like, which is preferable.

Next, an operation for fixing the inspection jig 10 of the present embodiment to the pipe P will be described.
First, the connection means 23 releases the connection between the tip of the movable frame 22 and the other end of the engagement frame 21. Then, the engaging frame 21 is engaged with the straight pipe portion PS of the pipe P (FIG. 3). Next, the movable frame 22 is swung toward the straight pipe portion PS, and the leading end of the movable frame 22 and the other end of the engagement frame 21 are coupled by the coupling means 23. Then, since the straight pipe part PS can be sandwiched between the engagement frame 21 and the movable frame 22, the fixing part 20 can be fixed to the straight pipe part PS (FIG. 1). At this time, since the hook member T of the engagement frame 21 is only hooked and fixed to the hook F of the movable frame 22, the time required for installing the fixing portion 20 is shortened.

  When the fixing unit 20 is installed, the ultrasonic probe S is attached to the sensor holding unit 41 of the holding unit 40, and the moving frame 42 is moved along the distal end portion 32 and arranged at a predetermined position. Then, when the ultrasonic probe S is brought into contact with the surface of the bent portion PB by the sensor holding portion 41, the preparation for inspection is completed.

  As described above, in the inspection jig 10 according to the present embodiment, the end of the movable frame 22 and the other of the engagement frame 21 are connected by the connecting means 23 in a state where the engagement frame 21 is engaged with the straight pipe portion PS. By simply connecting the ends, the fixing portion 20, that is, the inspection jig 10 can be fixed to the straight pipe portion PS, so the time required for installing the inspection jig 10 is shortened, and the inspection is accordingly performed. Preparation time is shortened. Then, even when inspecting the high-temperature pipe P, the state in which the heat insulating tool of the pipe P is removed can be shortened, so that the inspection can be performed without stopping the operation of the plant equipment.

Further, since the pipe housing portion of the engagement frame 21 is formed in a circular arc shape having substantially the same diameter as the outer diameter of the straight pipe portion PS, if the straight pipe portion PS is horizontal, the engagement frame 21 is removed. Since the inspection jig 10 can be stably placed on the straight pipe portion PS simply by engaging with the straight pipe portion PS (the state shown in FIG. 3), the inspection jig 10 can be installed or removed. Work becomes easy.
The fixing portion 20 is installed so that the center of curvature of the bent portion PB is positioned on the central axis of the shaft 24. At this time, the fixing portion 20 is repeatedly fixed and removed with respect to the straight pipe portion PS and aligned. As described above, the inspection jig 10 of this embodiment can be easily installed and removed from the straight pipe portion PS, and the time required for alignment can be shortened. Therefore, the inspection jig 10 of the present embodiment is particularly suitable when inspecting a high-temperature bent pipe P.

  Furthermore, since the inspection jig 10 of the present embodiment is attached to the straight pipe part PS so that the fixing part 20 is in a cantilever state, the degree of freedom of attachment to the straight pipe part PS can be increased, Easy installation on piping.

  The proximal end portion 31 and the distal end portion 32 of the swing arm 30 may be fixed, but the distal end portion 32 is connected so as to swing around the connection portion with the proximal end portion 31, and is fixed. Both may be fixedly released by 33. With this configuration, when the inspection jig 10 is installed in the straight pipe portion PS, the distal end portion 32 releases the fixation with the base end portion 31 and swings the distal end portion 32 in a direction away from the straight pipe portion PS. If it is moved, the swing arm 30 can be prevented from interfering with the mounting work of the fixed portion 20. Further, if the swinging of the distal end portion 32 with respect to the base end portion 31 is fixed by the fixing means 33 at the time of inspection, it is possible to prevent problems such as wobbling of the distal end portion 32 at the time of inspection.

  The fixing means 33 is not particularly limited as long as it can fix and release the proximal end portion 31 and the distal end portion 32. For example, as shown in FIG. 2, it is possible to employ a structure in which a through hole 33h is provided in the distal end portion 32 and a pin 33b is inserted into and removed from the through hole 33h by a plunger 33a. The plunger 33a only needs to be able to detach the pin 33b from the through hole 33h by constantly urging the pin 33b toward the through hole 33h by a spring or the like and pulling a knob or the like. By adopting such a plunger 33a, it is possible to prevent the pin 33b from falling off, and the operation of inserting and removing the pin 33b from the through hole 33h can be performed easily and in a short time.

In the above example, since the holding unit 40 is configured to hold only one sensor, the moving frame 42 of the swing arm 30 is changed when the inspection position is changed along the circumferential direction of the bent portion PB. It is necessary to move along the tip 32. However, if the holding unit 40 has a structure that can hold a plurality of sensors, a plurality of places can be inspected along the axial direction of the bent portion PB at the same time, so that the inspection work time can be shortened.
For example, in a state where the holding part 40 is attached to the straight pipe part PS, the plurality of sensors are displaced from each other in the circumferential direction of the bent part PB (for example, positions L1 to L7 in FIG. 5). If it can be held, the inspection along the axial direction of the bent portion PB can be simultaneously performed at the position where the sensor is arranged.
Then, the number of times that the swing arm 30 is swung can be reduced, and the work for moving the holding portion 40 to change the inspection position can be reduced, so that the inspection work time can be shortened.
Note that a plurality of holding units 40 that can hold only one sensor may be provided, and each holding unit 40 may be configured to hold a sensor. Even in this case, a single holding unit 40 can hold a plurality of sensors. Similar effects can be obtained.

  The pipe inspection method and inspection jig of the present invention are suitable for maintenance inspection of pipes through which fluid such as high-temperature process fluid and superheated steam flows in oil refinery plants, petrochemical plants, power plants, and the like.

It is a schematic explanatory drawing in the state where inspection jig 10 of this embodiment was attached to piping P. It is a schematic explanatory drawing of the condition which test | inspects the bending part PB of the piping P with the inspection jig | tool 10 of this embodiment. It is explanatory drawing of the operation | work which fixes the jig | tool 10 for an inspection of this embodiment to the piping P. FIG. FIG. 4 is a diagram illustrating a relative positional relationship between a shaft 24, an engagement frame 21 of a fixed portion 20, and a distal end portion 32 of a swing arm 20 in the sectional view taken along the line IV-IV in FIG. It is a schematic explanatory drawing of the inspection method of piping P using the inspection jig 10 of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inspection jig 20 Fixed part 21 Engagement frame 22 Movable frame 23 Connection means 30 Swing arm 31 Base end part 32 Tip part 40 Holding part P Piping PB Bending part PS Straight pipe part

Claims (6)

An inspection jig for moving the sensor along the axial direction of the bent pipe,
A fixed part attached to a straight pipe located near the bent part of the pipe;
A swing arm coupled to the fixed portion;
A holding portion for holding the sensor provided on the swing arm;
The swing arm is
In the state where the fixed part is attached to the straight pipe, the fixed part is connected to the fixed part so as to be swingable along the axial direction of the bent part of the pipe,
The fixing part is
A pipe inspection jig, which is attached to the straight pipe so that a swing center of the swing arm is positioned at a center of curvature of a bent portion of the pipe. The fixing part is
The base end is attached to the straight pipe so as to be in a cantilever state,
2. A pipe inspection jig according to claim 1, wherein a swing arm is connected to the tip of the swing arm. The fixing part is
An engagement frame provided with a pipe housing part having a circular arc section having substantially the same diameter as the outer diameter of the straight pipe;
A movable frame that holds the straight pipe between the engagement frame and the movable frame,
The base end of the engagement frame swings to one end in the circumferential direction of the engagement frame so that the engagement frame can be moved closer to and away from the radial direction of the engagement pipe when attached to the linear pipe. Are linked together,
The pipe inspection jig according to claim 1 or 2, wherein a connecting means for connecting and releasing the movable frame is provided between the distal end of the movable frame and the other end of the engaging frame. The swing arm is
A proximal end connected to the fixed portion;
In a state where the fixed part is attached to the linear pipe, a distal end part connected to the base end part so as to be swingable along a radial direction of the linear pipe;
4. A pipe inspection jig according to claim 1, further comprising fixing means for fixing and releasing swinging of the distal end portion with respect to the base end portion. The holding part is
A plurality of the sensors can be held,
In a state where the fixed portion is attached to the straight pipe, the plurality of sensors are held at positions shifted from each other in the circumferential direction of the bent portion of the pipe. The inspection jig for piping according to 3 or 4. A plurality of the holding portions are provided,
The pipe inspection jig according to claim 1, 2, 3, or 4, wherein each holding portion is provided with a sensor.

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