JP2023104386A - Ultrasonic flaw detecting probe - Google Patents

Abstract

To provide an ultrasonic flaw detecting probe capable of executing inspection for piping with high accuracy.SOLUTION: An ultrasonic flaw detecting probe to be inserted into piping includes a plurality of ultrasonic flaw detecting sensors each having a transmission/reception face capable of transmitting and receiving ultrasonic waves and arranged so as to be shifted in a circumferential direction of the ultrasonic flaw detecting probe. Each transmission/reception face of the plurality of ultrasonic flaw detecting sensors has a contour shape curved in a convex shape in a direction away from an axial line of the ultrasonic flaw detecting probe in a cross section perpendicular to the axial line of the ultrasonic flaw detecting probe, and also has a contour shape curved in a concave shape toward the axial line of the ultrasonic flaw detecting probe in a cross section along the axial line of the ultrasonic flaw detecting probe.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to an ultrasonic flaw detection probe that is inserted inside piping.

Boiler heat transfer tubes and other piping are inspected to check for damage such as thinning and fatigue cracks. Conventional visual inspection and fixed-point wall thickness measurement are insufficient for checking the soundness of piping because only representative portions of the piping are inspected. When the piping is inspected from the outside, ancillary work is required to arrange the inspection environment according to the installation environment and installation mode of the piping, which may result in a large cost.

In order to avoid the above problem, an ultrasonic flaw detection probe attached to the tip of a cable is sometimes inserted into the pipe to inspect the pipe from the inside. Patent Literature 1 discloses an ultrasonic flaw detection probe that includes an ultrasonic probe and a reflecting mirror that reflects ultrasonic waves from the ultrasonic probe.

The ultrasonic flaw detection probe includes a helical scan probe equipped with a rotation driving mechanism that rotates at least one ultrasonic flaw detection sensor in the circumferential direction of the ultrasonic flaw detection probe, and a plurality of ultrasonic flaw detection sensors that rotate in the circumferential direction of the ultrasonic flaw detection probe. There is a multi-scan probe that does not need to rotate a plurality of ultrasonic flaw detection sensors in the circumferential direction of the ultrasonic flaw detection probe (not provided with the rotation drive mechanism).

JP 2019-184542 A

A helical scan probe can accurately inspect a pipe to be inspected by reducing the measurement pitch. A multi-scan probe takes less time to inspect pipes than a helical scan probe that has a rotary drive mechanism, but the accuracy of pipe inspection is inferior, and improvement in the accuracy of pipe inspection is desired.

In view of the above circumstances, it is an object of at least one embodiment of the present invention to provide an ultrasonic flaw detection probe capable of inspecting piping with high accuracy.

An ultrasonic flaw detection probe according to at least one embodiment of the present invention comprises
An ultrasonic flaw detection probe inserted inside a pipe,
A plurality of ultrasonic flaw detection sensors having a transmitting/receiving surface capable of transmitting and receiving ultrasonic waves and arranged in a circumferential direction of the ultrasonic flaw detection probe,
The transmission/reception surface of each of the plurality of ultrasonic flaw detection sensors has a contour shape that curves convexly in a direction away from the axis of the ultrasonic flaw detection probe in a cross section perpendicular to the axis of the ultrasonic flaw detection probe. and has a contour shape that curves concavely toward the axis of the ultrasonic flaw detection probe in a cross section along the axis of the ultrasonic flaw detection probe.

According to at least one embodiment of the present invention, there is provided an ultrasonic flaw detection probe capable of accurately inspecting piping.

1 is a schematic configuration diagram schematically showing the configuration of a piping inspection system including an ultrasonic flaw detection probe according to an embodiment; FIG. FIG. 2 is a schematic diagram showing an example of a pipe to be inspected by an ultrasonic flaw detection probe according to one embodiment; 1 is a schematic cross-sectional view showing an example of a pipe to be inspected by an ultrasonic flaw detection probe according to one embodiment; FIG. FIG. 4 is an explanatory diagram for explaining the measurement principle of the ultrasonic flaw detection probe according to one embodiment; FIG. 4 is an explanatory diagram for explaining the measurement principle of the ultrasonic flaw detection probe according to one embodiment; 1 is a schematic configuration diagram of an ultrasonic flaw detection sensor in one embodiment; FIG. It is an explanatory view for explaining an ultrasonic flaw detection sensor in one embodiment. 1 is a schematic cross-sectional view along the axial direction of an ultrasonic flaw detection probe according to one embodiment; FIG. FIG. 4 is an explanatory diagram for explaining the measurement principle of the ultrasonic flaw detection probe according to one embodiment; FIG. 4 is an explanatory diagram for explaining a mode in a curved portion of a pipe of an ultrasonic flaw detection probe according to one embodiment;

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.

(Piping inspection system)
FIG. 1 is a schematic configuration diagram schematically showing the configuration of a pipe inspection system 10 including an ultrasonic flaw detection probe 1 according to one embodiment. An ultrasonic flaw detection probe (hereinafter referred to as a probe) 1 according to some embodiments is inserted inside a pipe 2 in order to inspect the pipe 2 by a water immersion ultrasonic method (water immersion UT). The probe 1 is mounted on a piping inspection system 10 .

A pipe inspection system 10 includes a cable 11, a probe 1 attached to one end (front end) of the cable 11, a plurality of cable guides 12 arranged at intervals along the axial direction of the cable 11, a pipe 2, an insertion device 13 for inserting the probe 1 and the cable 11, a control device 14 for controlling the drive of the probe 1 and the insertion device 13, and a measurement result (measurement data) by the probe 1 and an information terminal device 15 configured as follows.

A probe 1 and a cable 11 are inserted inside the pipe 2 . Hereinafter, the side in which the probe 1 and the cable 11 are first inserted into the pipe 2 in the axial direction is defined as the front side, and the side opposite to the front side is defined as the rear side.

Each of the control device 14 and the information terminal device 15 is an electronic control unit, and includes a CPU (processor) (not shown), memories such as ROM and RAM, storage devices such as external storage devices, I/O interfaces, communication interfaces, and the like. It may be configured as a microcomputer. The insertion device 13 has a mechanism that feeds the cable 11 forward or backward in accordance with an instruction for the amount of feeding of the cable 11 sent from the control device 14 .

The cable 11 is fed into the pipe 2 by driving the mechanical portion of the insertion device 13 . A signal indicating the inspection result (measurement result) by the probe 1 is sent from the probe 1 to the control device 14 and the information terminal device 15 . A position signal indicating the position (feed amount) of the cable 11 is sent from the insertion device 13 to the control device 14 and the information terminal device 15 . The control device 14 and the information terminal device 15 can acquire the position of the probe 1 from the position signal indicating the position (feed amount) of the cable 11 . The pipe inspection system 10 may be configured to feed the cable 11 into the pipe 2 manually. In this case, the pipe inspection system 10 may not include the insertion device 13 .

FIG. 2 is a schematic diagram showing an example of a pipe 2 to be inspected by the ultrasonic flaw detection probe 1 according to one embodiment. FIG. 3 is a schematic cross-sectional view showing an example of the pipe 2 to be inspected by the ultrasonic flaw detection probe 1 according to one embodiment. The pipe 2 to be inspected by the probe 1 has an inner surface 21 defining an internal space 22 inside the pipe 2 and an outer surface 23, as shown in FIG. During inspection of the pipe 2 by the probe 1, the internal space 22 is filled with liquid such as water.

The pipe 2 to be inspected may have a curved portion 24 that curves along the axial direction of the pipe 2 (the direction in which the pipe axis extends) as shown in FIG. In the curved portion 24 , the inner surface 21 and the outer surface 23 of the pipe 2 are curved along the axial direction of the pipe 2 . In the embodiment shown in FIG. 2, the pipe 2 to be inspected comprises a heat transfer tube of a boiler. The pipe (heat transfer tube) 2 includes a curved portion 24 that curves in a U-shape from the upper end to the lower end, a first header 25 , and a second header 26 arranged below the first header 25 . a first pipe 27 including an extending portion extending horizontally or obliquely upward from the upper end of the curved portion 24 and having a tip end connected to the first header 25; and a second pipe 28 including an extension portion extending downward in a direction or obliquely and having a tip end connected to the second header 26 . In one embodiment, the probe 1 is inserted into the pipe 2 from either the first header 25 or the second header 26 and passes halfway through the bend 24 to the first header 25 or the second header 26 . The inspection may be performed up to the other side of the header 26 .

As shown in FIG. 3, the pipe 2 to be inspected protrudes from the inner surface 21 and is twisted in the circumferential direction of the pipe 2 as it goes in the axial direction of the pipe 2 (extending direction of the axis L of the pipe 2). It may be a rifle tube having one (in the illustrated example, multiple) helical ribs 211 . The pipe 2 to be inspected may include the curved portion 24 and have at least one spiral rib 211 on the inner surface 21 . The spiral rib 211 has an end surface 212 extending along the circumferential direction of the pipe 2 radially inward of the inner surface 21 of the pipe 2 in a cross section perpendicular to the axis L of the pipe 2 as shown in FIG. have.
(Ultrasonic flaw detection probe)

4 and 5 are explanatory diagrams for explaining the measurement principle of the ultrasonic flaw detection probe 1 according to one embodiment. The probe 1 is a multi-scan probe that does not require rotating a plurality of ultrasonic flaw detection sensors (hereinafter referred to as sensors) 3 along the circumferential direction of the probe 1 when inspecting the pipe 2 . As shown in FIG. 4, the probe 1 has a transmitting/receiving surface 31 capable of transmitting and receiving ultrasonic waves, and a plurality of sensors 3 (in the illustrated example, 1 ch to 16ch). The transmitting/receiving surface 31 is arranged facing outward in the radial direction of the probe 1 . A gap is provided between the transmitting/receiving surface 31 and the inner surface 21 of the pipe 2 when the probe 1 is inserted into the inner space 22 of the pipe 2 . This gap is filled with a liquid such as water.

As shown in FIG. 4, each of the plurality of sensors 3 is in charge of a test area (test area) of the test area DA (inspection area) divided into a plurality of test areas in the circumferential direction of the probe 1 from the transmitting/receiving surface 31. Ultrasonic waves are transmitted to the flaw detection area in charge) DA, and ultrasonic waves reflected by defects (flaws, cracks, etc.) formed in the inner surface 21 and outer surface 23 of the pipe 2 and the pipe 2 in the flaw detection area (flaw detection area in charge) DA are emitted. , on the transmitting/receiving surface 31 . The pipe 2 is inspected over the entire circumference of the probe 1 by a plurality of ultrasonic flaw detection sensors 3 that are displaced in the circumferential direction of the probe 1 .

As shown in FIG. 5, the probe 1 is sent along the measurement direction, that is, the axial direction of the pipe 2 (extending direction of the axis L of the pipe 2), so that the probe 1 is displaced in the circumferential direction. A flaw detection area (detection area in charge) DA (see FIG. 4) of each of the plurality of ultrasonic flaw detection sensors 3 moves along the measurement direction. Since the probe 1 does not need to rotate the sensor 3 when inspecting the pipe 2 , high-speed inspection can be realized compared to the case of having a rotation mechanism for rotating the sensor 3 .

FIG. 6 is a schematic configuration diagram of an ultrasonic flaw detection sensor in one embodiment. Each of the plurality of sensors 3 described above is composed of a water immersion probe used for a water immersion ultrasonic method (water immersion UT). The water immersion probe is a single transducer probe in which a receiver and a transmitter are integrated.

In the embodiment shown in FIG. 6, each of the plurality of sensors 3 includes a piezoelectric element 32 having the transmitting/receiving surface 31 described above and a sound absorbing material 33 . Each of the multiple sensors 3 may further include a protective film 35 covering the piezoelectric element 32 as shown in FIG. The probe 1 comprises a plurality of sensor holders 34 each housing the piezoelectric element 32 of the sensor 3, the sound absorbing material 33 and the protective membrane 35. FIG. The piezoelectric element 32 is housed inside the sound absorbing material 33 of the sensor holder 34 (inner side in the radial direction of the probe 1 ) and attached to the outer surface 331 of the sound absorbing material 33 . The protective film 35 is accommodated outside the piezoelectric element 32 of the sensor holder 34 (outside in the radial direction of the probe 1). A part of the protective film 35 may protrude outside the sensor holder 34 . An outer surface 321 of the piezoelectric element 32 (the surface opposite to the surface attached to the sound absorbing material 33 in the thickness direction of the piezoelectric element 32) serves as the transmitting/receiving surface 31 described above.

The piping inspection system 10 includes at least one pulsar receiver 37 and a coaxial cable 36 electrically connecting the piezoelectric element 32 of each of the plurality of sensors 3 and the at least one pulsar receiver 37, as shown in FIG. and including. The coaxial cable 36 is housed in the cable 11 partially described above. Each pulser receiver 37 functions as a pulser that supplies a transmission signal from the pulser receiver 37 to the piezoelectric element 32 via the coaxial cable 36, and supplies a reception signal from the piezoelectric element 32 to the pulser receiver 37 via the coaxial cable 36. a function as a receiver; Each pulser receiver 37 is electrically connected to at least one piezoelectric element 32 . In the illustrated embodiment, each of the plurality of pulser receivers 37 (37A, 37B, etc.) is mounted on the control device 14, but may be mounted on a device other than the control device 14, such as the information terminal device 15. good.

In the illustrated embodiment, the coaxial cable 36 alternates between a transmit function of transmitting a transmit signal and a receive function of transmitting a receive signal. Specifically, after opening the pulser circuit of one pulser receiver 37A of the plurality of pulser receivers 37 and applying a voltage to the piezoelectric element 32 of the sensor 3 (transmitting a transmission signal), the pulser circuit is closed, The receiver circuit of pulser receiver 37A is opened. Ultrasonic waves generated by applying a voltage to the piezoelectric element 32 return to the piezoelectric element 32 after passing through liquid such as water filled in the internal space 22, the pipe 2, and the liquid. Ultrasonic waves are transmitted from the transmitting/receiving surface 31 of the sensor 3, and the ultrasonic waves reflected by the inner surface 21 and the outer surface 23 of the pipe 2 and defects (such as scratches and cracks) formed in the pipe 2 are received by the transmitting/receiving surface 31 of the sensor 3. .

After the receiver circuit of the pulser receiver 37A receives the voltage newly generated by the return of the ultrasonic wave to the piezoelectric element 32 (reception of the received signal), the receiver circuit of the pulser receiver 37A is closed and the pulser circuit is opened. After that, a pulser receiver 37B different from the pulser receiver 37A among the plurality of pulser receivers 37 applies a voltage to the sensor 3 different from the sensor 3 described above. That is, application of voltage to the corresponding sensors 3 by the plurality of pulser receivers 37 is repeated in sequence.

The outer surface 331 of the sound absorbing material 33 of each of the plurality of sensors 3 is convexly curved in a direction away from the axis LA of the probe 1 in a cross section orthogonal to the axis LA of the probe 1 as shown in FIG. It is formed in a convex circular arc shape. Since the piezoelectric element 32 of each of the plurality of sensors 3 is attached to the outer side surface 331 of the sound absorbing material 33, the piezoelectric element 32 moves away from the axis LA of the probe 1 in a cross section orthogonal to the axis LA of the probe 1. It is formed in a convex circular arc shape. The transmitting/receiving surface 31 (outer surface 321 of the piezoelectric element 32) of each of the plurality of sensors 3 has a contour that curves convexly in a direction away from the axis LA of the probe 1 in a cross section perpendicular to the axis LA of the probe 1. It has shape 311 . Therefore, ultrasonic waves are transmitted from the transmitting/receiving surface 31 of each of the plurality of sensors 3 so as to spread over a wide angle in the circumferential direction of the probe 1 . As shown in FIG. 6, the ultrasonic waves emitted from the transmitting/receiving surface 31 having the contour shape 311 are input along the direction perpendicular to the inner surface 21 of the pipe 2 in the cross section orthogonal to the axis LA of the probe 1. be. The fact that the ultrasonic wave spreads over a wide angle means that the flaw detection area DA (inspection area) of each sensor 3 expands toward the outside in the radial direction of the probe 1 .

FIG. 7 is an explanatory diagram for explaining the ultrasonic flaw detection sensor in one embodiment. The outer surface 331 of the sound absorbing material 33 of each of the plurality of sensors 3 has a concave arc shape that curves concavely toward the axis LA of the probe 1 in a cross section along the axis LA of the probe 1 as shown in FIG. formed. Since the piezoelectric element 32 of each of the plurality of sensors 3 is attached to the outer surface 331 of the sound absorbing material 33, the cross section along the axis LA of the probe 1 curves concavely toward the axis LA of the probe 1. It is formed in a concave arc shape. The transmitting/receiving surface 31 (the outer surface 321 of the piezoelectric element 32 ) of each of the plurality of sensors 3 has a contour shape 312 concavely curved toward the axis LA of the probe 1 in a cross section along the axis LA of the probe 1 . Therefore, ultrasonic waves are emitted from the transmitting/receiving surface 31 of each of the plurality of sensors 3 so as to converge in the axial direction of the probe 1 . Convergence of ultrasonic waves means that the inspection area DA (inspection area) of each sensor 3 narrows as it goes radially outward of the probe 1 .

As shown in FIG. 4, the probe 1 according to some embodiments has the transmission/reception surface 31 described above and includes a plurality of sensors 3 that are displaced in the circumferential direction of the probe 1 . The transmitting/receiving surface 31 of each of the plurality of sensors 3 has a contour shape 311 curved convexly in a direction away from the axis LA of the probe 1 in a cross section orthogonal to the axis LA of the probe 1 as shown in FIG. and has a contour shape 312 curved concavely toward the axis LA of the probe 1 in a cross section along the axis LA of the probe 1 as shown in FIG.

According to the above configuration, the transmitting/receiving surface 31 of each of the plurality of sensors 3 has a contour shape 311 curved convexly in a direction away from the axis LA of the probe 1 in a cross section orthogonal to the axis LA of the probe 1. have In this case, ultrasonic waves are transmitted from the transmitting/receiving surface 31 of each of the plurality of sensors 3 so as to spread over a wide angle in the circumferential direction of the probe 1 . As a result, since the inspection area DA (inspection area) of each of the plurality of sensors 3 can be expanded in the circumferential direction of the probe 1, the inspection of the pipe 2 over a wide range in the circumferential direction of the probe 1 can be quickly performed. be. Since the probe 1 does not need to rotate each of the plurality of sensors 3 when inspecting the pipe 2 , high-speed inspection can be achieved compared to the case of having a rotation mechanism for rotating each of the plurality of sensors 3 .

Further, according to the above configuration, the transmitting/receiving surface 31 of each of the plurality of sensors 3 has a contour shape 312 curved concavely toward the axis LA of the probe 1 in a cross section along the axis LA of the probe 1 . In this case, ultrasonic waves are emitted from the transmitting/receiving surfaces 31 of the plurality of sensors 3 so as to converge in the axial direction of the probe 1 . As a result, since the inspection area DA (inspection area) of each of the plurality of sensors 3 can be narrowed in the axial direction of the probe 1, the inspection of the pipe 2 can be performed with high accuracy. Therefore, according to the above configuration, since each of the plurality of sensors 3 includes the transmitting/receiving surface 31 having the contour shapes 311 and 312, it is possible to inspect a wide range of the pipe 2 in the circumferential direction at high speed and with high accuracy. be.

In some embodiments, as shown in FIG. 4, each of the plurality of sensors 3 described above overlaps another sensor 3 adjacent in the circumferential direction of the probe 1 in the inspection area DA. It was arranged to have a certain overlapping flaw detection area ODA. As shown in FIG. 4, each of the plurality of sensors 3 has an overlapping flaw detection area ODA between another sensor 3 adjacent to one side in the circumferential direction of the probe 1, and in the circumferential direction of the probe 1 It has an overlapping flaw detection area ODA between another sensor 3 adjacent to the other side.

According to the above configuration, each of the plurality of sensors 3 is arranged so as to have the overlapping inspection area ODA, so that an uninspected area that is not included in the inspection area DA of each of the sensors 3 adjacent to each other is generated. can be suppressed. By suppressing the occurrence of the uninspected region, it is possible to inspect the pipe 2 over a wide range in the circumferential direction of the probe 1 with high accuracy.

FIG. 8 is a schematic cross-sectional view along the axial direction of the probe 1 according to one embodiment. In some embodiments, as shown in FIG. 8, the plurality of sensors 3 described above includes a first front-side ultrasonic flaw detection sensor array 4A spaced apart in the circumferential direction of the probe 1 and a second ultrasonic flaw detection sensor array 4A. A first rear ultrasonic flaw detection sensor array 4B is arranged behind the first front ultrasonic flaw detection sensor array 4A and displaced in the circumferential direction of the probe 1 with respect to the first front ultrasonic flaw detection sensor array 4A. and including.

As shown in FIG. 8, the probe 1 described above includes a plurality of first front sensor holders 41 that support the plurality of sensors 3 constituting the first front ultrasonic flaw detection sensor array 4A, and a first A plurality of first rear sensor holders 42 for supporting each of the plurality of sensors 3 constituting one rear ultrasonic flaw detection sensor array 4B, a plurality of first front sensor holders 41 and a plurality of first and a first sensor unit 43 to which the rear sensor holder 42 is attached. The multiple sensor holders 34 described above include multiple first front sensor holders 41 and multiple first rear sensor holders 42 .

As shown in FIG. 4, each of the plurality of sensors 3 forming the first front ultrasonic flaw detection sensor array 4A and the plurality of sensors 3 forming the first rear ultrasonic flaw detection sensor array 4B is They are arranged at positions shifted from each other in the circumferential direction of the probe 1 . As shown in FIG. 4, each of the plurality of sensors 3 constituting the first rear ultrasonic flaw detection sensor array 4B is adjacent to each other in the circumferential direction of the probe 1, and the first front ultrasonic flaw detection sensor array. It may be arranged between a pair of sensors 3, 3 that constitute 4A. As shown in FIG. 4, a plurality of sensors 3 (1ch to 16ch in the illustrated example) constituting the first front-side ultrasonic flaw detection sensor array 4A and the first rear-side ultrasonic flaw detection sensor array 4B detect probes. The inspection of the pipe 2 may be performed over the entire circumference in the circumferential direction of 1 .

According to the above configuration, the probe 1 can inspect the pipe 2 by arranging the plurality of sensors 3 in the first front ultrasonic flaw detection sensor array 4A and the first rear ultrasonic flaw detection sensor array 4B. Since the number of sensors 3 used can be increased, the inspection accuracy of the probe 1 can be improved.

In some embodiments, as shown in FIG. 8, the plurality of sensors 3 described above includes a second front ultrasonic flaw detection sensor array 5A spaced apart in the circumferential direction of the probe 1 and a second ultrasonic flaw detection sensor array 5A. A second rear ultrasonic flaw detection sensor row 5B is arranged behind the second front ultrasonic flaw detection sensor row 5A, shifted in the circumferential direction of the probe 1 with respect to the second front ultrasonic flaw detection sensor row 5A. and further including.

As shown in FIG. 8, the probe 1 described above includes a plurality of second front sensor holders 51 that support the plurality of sensors 3 constituting the second front ultrasonic testing sensor array 5A, and a first A plurality of second rear sensor holders 52 supporting each of the plurality of sensors 3 constituting the rear ultrasonic flaw detection sensor array 5B, a plurality of second front sensor holders 51 and a plurality of second and a second sensor unit 53 to which the rear sensor holder 52 is attached. The second sensor section 53 is arranged forward or rearward of the first sensor section 43 in the axial direction of the probe 1 (the direction in which the axis LA of the probe 1 extends). The multiple sensor holders 34 described above include multiple second front sensor holders 51 and multiple second rear sensor holders 52 .

In the illustrated embodiment, the second sensor section 53 is arranged forward of the first sensor section 43 in the axial direction of the probe 1 . The second sensor unit 53 is connected to the first sensor unit 43 so as to be rotatable about a rotation axis RA1 extending along a direction perpendicular to the axis LC of the second sensor unit 53 . In the embodiment shown in FIG. 8, a front end portion 442 projecting forward from the first front brush portion 45 of the first front guide portion 44, which will be described later, and a second rear guide portion, which will be described later. A rear side end portion 562 of the portion 56 protruding rearward from the second rear side brush portion 57 is connected via a connecting pin 49 extending along the rotation axis RA1. The second sensor section 53 is connected to the first sensor section 43 through a connection pin 49 so as to be rotatable around the rotation axis RA1.

According to the above configuration, the probe 1 can inspect the pipe 2 by arranging the plurality of sensors 3 in the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B. Since the number of sensors 3 to be used can be increased, the inspection accuracy of the probe 1 can be improved compared to the case where the inspection is performed only with the first front ultrasonic flaw detection sensor row 4A and the first rear ultrasonic flaw detection sensor row 4B. can be improved.

FIG. 9 is an explanatory diagram for explaining the measurement principle of the ultrasonic flaw detection probe according to one embodiment. In some embodiments, as shown in FIG. 9, each of the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B described above is a first front ultrasonic flaw detection sensor array. It is arranged to be displaced in the circumferential direction of the probe 1 with respect to the ultrasonic flaw detection sensor array 4A and the first rear ultrasonic flaw detection sensor array 4B.

As shown in FIG. 9, each of the plurality of sensors 3 forming the second front ultrasonic flaw detection sensor array 5A and the plurality of sensors 3 forming the second rear ultrasonic flaw detection sensor array 5B is They are arranged at positions shifted from each other in the circumferential direction of the probe 1 . Each of the plurality of sensors 3 constituting the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B is adjacent to each other in the circumferential direction of the probe 1, the first front ultrasonic flaw detection sensor array. It may be arranged between a pair of sensors 3, 3 constituting the ultrasonic flaw detection sensor array 4A or the first rear ultrasonic flaw detection sensor array 4B. As shown in FIG. 9, there are a first front ultrasonic flaw detection sensor array 4A, a first rear ultrasonic flaw detection sensor array 4B, a second front ultrasonic flaw detection sensor array 5A and a second rear ultrasonic flaw detection sensor array. A plurality of sensors 3 (1ch to 32ch in the illustrated example) constituting the ultrasonic flaw detection sensor array 5B may inspect the pipe 2 over the entire circumference of the probe 1 in the circumferential direction.

According to the above configuration, the probe 1 has an inspection range (flaw detection area DA) and the inspection range (flaw detection area DA) in which the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B are in charge of inspection, each sensor 3 The inspection range (flaw detection area DA) in the circumferential direction of the probe 1 can be made small. Therefore, it is possible to accurately inspect the pipe 2 over a wide range in the circumferential direction of the probe 1 using the plurality of sensors 3 .

In some other embodiments, the plurality of sensors 3 constituting the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B are the first front ultrasonic flaw detection sensors. It does not have to be displaced in the circumferential direction of the probe 1 with respect to the plurality of sensors 3 forming the row 4A and the first rear ultrasonic flaw detection sensor row 4B. That is, a plurality of sensors 3 constituting the first front ultrasonic flaw detection sensor array 4A and the first rear ultrasonic flaw detection sensor array 4B, the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5A The inspection range (flaw detection area DA) may overlap with the plurality of sensors forming the side ultrasonic flaw detection sensor array 5B. For example, the plurality of sensors 3 constituting the second front ultrasonic flaw detection sensor row 5A and the second rear ultrasonic flaw detection sensor row 5B inspect the pipe 2 over the entire circumference of the probe 1 in the circumferential direction. It may be so arranged that

(probe alignment structure, brush)
In some embodiments, as shown in FIG. 8 , the probe 1 described above is attached to the front side of the plurality of first front sensor holders 41 in the first sensor section 43 . The guide portion 44, the first front side brush portion 45 provided on the outer peripheral surface 441 of the first front side guide portion 44, and the plurality of first rear side sensor holders 42 in the first sensor portion 43 are located rearwardly. It further includes a first rear side guide portion 46 attached to the side and a first rear side brush portion 47 provided on an outer peripheral surface 461 of the first rear side guide portion 46 .

The first front brush portion 45 has a plurality of bristles that are planted on the outer peripheral surface 441 of the first front guide portion 44 and extend along a direction perpendicular to the axis LB of the first sensor portion 43. Includes bundle group 451 . Each of the plurality of hair bundle groups 451 is arranged apart from each other in the axial direction and the circumferential direction of the first sensor section 43 .

The first rearward brush portion 47 has a plurality of bristles that are planted on the outer peripheral surface 461 of the first rearward guide portion 46 and extend along a direction perpendicular to the axis LB of the first sensor portion 43 . Includes bundle group 471 . Each of the plurality of hair bundle groups 471 is arranged apart from each other in the axial direction and the circumferential direction of the first sensor section 43 .

In the illustrated embodiment, the front end portion of the first sensor portion 43 is inserted into a shaft hole formed in the rear end portion of the first front guide portion 44 , and the first front guide portion 44 is fastened to the first sensor portion 43 so as to be slidable along the axial direction of the first sensor portion 43 (extending direction of the axis LB). The rear end of the first sensor portion 43 is inserted into the shaft hole formed in the front end of the first rear guide portion 46 , and the first rear guide portion 46 is inserted into the first sensor portion 43 . It is fastened so as to be slidable along the axial direction of the first sensor portion 43 .

In the illustrated embodiment, the first front brush portion 45 further includes an annular member 452 whose inner peripheral surface fits into the outer peripheral surface 441 of the first front guide portion 44 . The first rearward brush portion 47 further includes an annular member 472 whose inner peripheral surface is fitted to the outer peripheral surface 461 of the first rearward guide portion 46 . Annular member 452 and annular member 472 are preferably made of metal or reinforced plastic.

According to the above configuration, the plurality of hair bundle groups 451 and the plurality of hair bundle groups 471 can align the first sensor section 43 and hold the first sensor section 43 at the center of the pipe 2 . By holding the first sensor unit 43 at the center of the pipe 2, the distance between the first front ultrasonic flaw detection sensor row 4A or the first rear ultrasonic flaw detection sensor row 4B and the inner surface 21 of the pipe 2 can be suppressed from fluctuating, it is possible to suppress deterioration in inspection accuracy of the first front ultrasonic flaw detection sensor array 4A and the first rear ultrasonic flaw detection sensor array 4B.

In some embodiments, as shown in FIG. 8 , the probe 1 described above is attached to the front side of the plurality of second front sensor holders 51 in the second sensor section 53 . The guide portion 54, the second front side brush portion 55 provided on the outer peripheral surface 541 of the second front side guide portion 54, and the plurality of second rear side sensor holders 52 in the second sensor portion 53 are positioned rearwardly of the second rear side sensor holders 52. It further includes a second rear guide portion 56 attached to the side and a second rear brush portion 57 provided on an outer peripheral surface 561 of the second rear guide portion 56 .

The second front brush portion 55 has a plurality of bristles that are planted on the outer peripheral surface 541 of the second front guide portion 54 and extend along a direction orthogonal to the axis LC of the second sensor portion 53. Includes bundle group 551 . Each of the plurality of hair bundle groups 551 is arranged apart from each other in the axial direction and the circumferential direction of the second sensor section 53 .

The second rear brush portion 57 has a plurality of bristles that are planted on the outer peripheral surface 561 of the second rear guide portion 56 and extend along a direction orthogonal to the axis LC of the second sensor portion 53. Includes bundle group 571 . Each of the plurality of hair bundle groups 571 is arranged apart from each other in the axial direction and the circumferential direction of the second sensor section 53 .

In the illustrated embodiment, the front end portion of the second sensor portion 53 is inserted into the shaft hole formed in the rear end portion of the second front guide portion 54 , and the second front guide portion 54 is fastened to the second sensor portion 53 so as to be slidable along the axial direction of the second sensor portion 53 (extending direction of the axis LC). The rear end of the second sensor portion 53 is inserted into the shaft hole formed in the front end of the second rear guide portion 56 , and the second rear guide portion 56 is inserted into the second sensor portion 53 . It is fastened so as to be slidable along the axial direction of the second sensor portion 53 .

In the illustrated embodiment, the second front brush portion 55 further includes an annular member 552 whose inner peripheral surface fits into the outer peripheral surface 541 of the second front guide portion 54 . The second rearward brush portion 57 further includes an annular member 572 whose inner peripheral surface is fitted to the outer peripheral surface 561 of the second rearward guide portion 56 . Annular member 552 and annular member 572 are preferably made of metal or reinforced plastic.

According to the above configuration, the plurality of hair bundle groups 551 and the plurality of hair bundle groups 571 can align the second sensor section 53 and hold the second sensor section 53 at the center of the pipe 2 . By holding the second sensor unit 53 at the center of the pipe 2, the distance between the second front ultrasonic flaw detection sensor row 5A or the second rear ultrasonic flaw detection sensor row 5B and the inner surface 21 of the pipe 2 can be suppressed from fluctuating, it is possible to suppress deterioration in inspection accuracy of the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B.

In some embodiments, the probe 1 described above further comprises at least one first metal wire 48, as shown in FIG. In the embodiment shown in FIG. 8 , the at least one first metal wire 48 comprises a plurality of first metal wires 48 spaced from each other in the circumferential direction of the probe 1 .

One end 481 of each of the plurality of first metal wires 48 is connected to the rear side of the plurality of hair bundle groups 451 in the annular member 452, as shown in FIG. Each of the plurality of first metal wires 48 is connected to the other end 482 on the front side of the plurality of hair bundle groups 471 in the annular member 472 . Each of the plurality of first metal wires 48 has a curved shape that protrudes in a direction away from the axis LB of the first sensor section 43 . Each of the plurality of first metal wires 48 is arranged such that the other end 482 is shifted from the one end 481 in the circumferential direction of the probe 1 .

According to the above configuration, when the first metal wire 48 comes into contact with the inner surface 21 of the pipe 2, the first metal wire 48 is elastically deformed and exerts a restoring force to return to its original shape. The restoring force of the first metal wire 48 allows the first sensor portion 43 to be aligned, and the first sensor portion 43 to be held at the center of the pipe 2 . By holding the first sensor unit 43 at the center of the pipe 2, the distance between the first front ultrasonic flaw detection sensor row 4A or the first rear ultrasonic flaw detection sensor row 4B and the inner surface 21 of the pipe 2 can be suppressed from fluctuating, it is possible to suppress deterioration in inspection accuracy of the first front ultrasonic flaw detection sensor array 4A and the first rear ultrasonic flaw detection sensor array 4B.

FIG. 10 is an explanatory diagram for explaining the aspect of the curved portion of the pipe of the ultrasonic flaw detection probe according to one embodiment. As shown in FIG. 10 , even when the first sensor portion 43 is located inside the curved portion 24 of the pipe 2 , the metal wire 48 can align the first sensor portion 43 . As a result, when the first sensor portion 43 is positioned within the curved portion 24 of the pipe 2, the probe 1 can be operated by the first front-side ultrasonic flaw detection sensor array 4A provided in the first sensor portion 43 and the first ultrasonic flaw detection sensor array 4A. The curved portion 24 can be inspected with high accuracy by the single rear ultrasonic flaw detection sensor array 4B.

In some embodiments, the probe 1 described above further comprises at least one second metal wire 58, as shown in FIG. In the embodiment shown in FIG. 8 , the at least one second metal wire 58 comprises a plurality of second metal wires 58 spaced from each other in the circumferential direction of the probe 1 .

One end 581 of each of the plurality of second metal wires 58 is connected to the rear side of the plurality of hair bundle groups 551 in the annular member 552, as shown in FIG. Each of the plurality of second metal wires 58 is connected to the other end 582 on the front side of the plurality of hair bundle groups 571 in the annular member 572 . Each of the plurality of second metal wires 58 has a curved shape that protrudes in a direction away from the axis LC of the second sensor section 53 . Each of the plurality of second metal wires 58 is arranged such that the other end 582 is shifted from the one end 581 in the circumferential direction of the probe 1 .

According to the above configuration, when the second metal wire 58 comes into contact with the inner surface 21 of the pipe 2, the second metal wire 58 is elastically deformed and exerts a restoring force to return to its original shape. The restoring force of the second metal wire 58 allows the second sensor section 53 to be aligned, and the second sensor section 53 to be held at the center of the pipe 2 . By holding the second sensor unit 53 at the center of the pipe 2, the distance between the second front ultrasonic flaw detection sensor row 5A or the second rear ultrasonic flaw detection sensor row 5B and the inner surface 21 of the pipe 2 can be suppressed from fluctuating, it is possible to suppress deterioration in inspection accuracy of the second front ultrasonic flaw detection sensor array 5A and the second rear ultrasonic flaw detection sensor array 5B.

As shown in FIG. 10 , even when the second sensor section 53 is positioned inside the curved portion 24 of the pipe 2 , the second sensor section 53 can be aligned with the metal wire 58 . As a result, when the second sensor portion 53 is positioned within the curved portion 24 of the pipe 2, the probe 1 can be operated by the second front ultrasonic flaw detection sensor array 5A provided in the second sensor portion 53 and the second ultrasonic flaw detection sensor array 5A. 2, the bending portion 24 can be inspected with high accuracy by the rear ultrasonic flaw detection sensor array 5B.

As used herein, expressions such as "in a certain direction", "along a certain direction", "parallel", "perpendicular", "central", "concentric" or "coaxial", etc. express relative or absolute arrangements. represents not only such arrangement strictly, but also the state of being relatively displaced with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
Further, in this specification, expressions representing shapes such as a quadrilateral shape and a cylindrical shape not only represent shapes such as a quadrilateral shape and a cylindrical shape in a geometrically strict sense, but also within the range in which the same effect can be obtained. , a shape including an uneven portion, a chamfered portion, and the like.
Moreover, in this specification, the expressions “comprising”, “including”, or “having” one component are not exclusive expressions excluding the presence of other components.

The present disclosure is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

The contents described in the several embodiments described above are understood as follows, for example.

1) The ultrasonic flaw detection probe (1) according to at least one embodiment of the present disclosure is
An ultrasonic flaw detection probe (1) inserted inside a pipe (2),
A plurality of ultrasonic flaw detection sensors (3) having a transmitting/receiving surface (31) capable of transmitting and receiving ultrasonic waves and arranged in a circumferential direction of the ultrasonic flaw detection probe (1),
The transmitting/receiving surface (31) of each of the plurality of ultrasonic flaw detection sensors (3) is, in a cross section perpendicular to the axis (LA) of the ultrasonic flaw detection probe (1), In a cross section along the axis (LA) of the ultrasonic flaw detection probe (1) having a contour shape (311) that curves convexly in a direction away from the axis (LA), the ultrasonic flaw detection It has a contour shape (312) that curves concavely towards said axis (LA) of the probe (1).

According to the above configuration 1), the transmitting/receiving surface (31) of each of the plurality of ultrasonic flaw detection sensors (3) is the ultrasonic flaw detection probe It has a contour shape (311) that curves convexly in a direction away from the axis (LA) of (1). In this case, the transmitting/receiving surface (31) of each of the plurality of ultrasonic flaw detection sensors (3) emits ultrasonic waves so as to spread over a wide angle in the circumferential direction of the ultrasonic flaw detection probe (1). As a result, it is possible to rapidly inspect the pipe (2) over a wide range in the circumferential direction of the ultrasonic flaw detection probe (1). Since it is not necessary to rotate each of the plurality of ultrasonic flaw detection sensors (3) when inspecting the pipe (2), the ultrasonic flaw detection probe (1) rotates each of the plurality of ultrasonic flaw detection sensors (3). High-speed inspection can be realized as compared with the case of having a rotation mechanism for rotating.

Further, according to the above configuration 1), the transmitting/receiving surface (31) of each of the plurality of ultrasonic flaw detection sensors (3) transmits ultrasonic waves in a cross section along the axis (LA) of the ultrasonic flaw detection probe (1). It has a contour shape (312) that curves concavely toward the axis (LA) of the flaw detection probe (1). In this case, ultrasonic waves are emitted so as to converge in the axial direction of the ultrasonic flaw detection probe (1) from the transmitting/receiving surface (31) of each of the plurality of ultrasonic flaw detection sensors (3). Thereby, the inspection of the pipe (2) can be performed with high accuracy. Therefore, according to the above configuration 1), since each of the plurality of ultrasonic flaw detection sensors (3) includes the transmitting/receiving surface (21) having the contour shape (311, 312), the circumferential direction of the pipe (2) High-speed and high-precision inspection is possible over a wide range in

2) In some embodiments, the ultrasonic flaw detection probe (1) according to 1) above,
Each of the plurality of ultrasonic flaw detection sensors (3) has a mutual flaw detection area (DA) with respect to another ultrasonic flaw detection sensor (3) adjacent in the circumferential direction of the ultrasonic flaw detection probe (1). It was arranged to have an overlapping area (ODA), which is an overlapping portion.

According to the above configuration 2), each of the plurality of ultrasonic flaw detection sensors (3) is arranged so as to have the overlapping flaw detection area (ODA), so that each of the ultrasonic flaw detection sensors (3) adjacent to each other It is possible to suppress the occurrence of an uninspected area that is not included in the flaw detection area (DA). By suppressing the occurrence of the uninspected region, it is possible to accurately inspect the pipe (2) over a wide range in the circumferential direction of the ultrasonic flaw detection probe (1).

3) In some embodiments, the ultrasonic flaw detection probe (1) according to 1) or 2) above,
The plurality of ultrasonic flaw detection sensors (3) are
a first front-side ultrasonic flaw detection sensor row (4A) arranged at intervals in the circumferential direction of the ultrasonic flaw detection probe (1);
Behind the first front-side ultrasonic flaw detection sensor array (4A), the ultrasonic flaw detection probe (1) is displaced in the circumferential direction with respect to the first front-side ultrasonic flaw detection sensor array (4A) A first rear ultrasonic flaw detection sensor array (4B) arranged,
The ultrasonic flaw detection probe (1)
a plurality of first front-side sensor holders (41) supporting each of the plurality of ultrasonic flaw-detection sensors (3) constituting the first front-side ultrasonic flaw-detection sensor array (4A);
a plurality of first rear sensor holders (42) for respectively supporting the plurality of ultrasonic flaw detection sensors (3) constituting the first rear ultrasonic flaw detection sensor array (4);
A first sensor section (43) to which the plurality of first front side sensor holders (41) and the plurality of first rear side sensor holders (42) are attached is further provided.

According to the configuration of 3) above, the ultrasonic flaw detection probe (1) includes a plurality of ultrasonic flaw detection sensors (3), the first front ultrasonic flaw detection sensor row (4A) and the first rear ultrasonic flaw detection sensor array (4A). By arranging them in the flaw detection sensor array (4B), it is possible to inspect the pipe (2) over a wide range in the circumferential direction of the ultrasonic flaw detection probe (1) without rotating the first sensor part (43). Since the ultrasonic flaw detection probe (1) does not need to rotate the first sensor part (43) when inspecting the pipe (2), it realizes high-speed inspection compared to the case where it has a rotation mechanism for rotating the sensor part. can. Since the number of ultrasonic flaw detection sensors (3) used to inspect the pipe (2) can be increased, the inspection accuracy of the ultrasonic flaw detection probe (1) can be improved.

4) In some embodiments, the ultrasonic flaw detection probe (1) according to 3) above,
The plurality of ultrasonic flaw detection sensors (3) are
a second front-side ultrasonic flaw detection sensor row (5A) arranged at intervals in the circumferential direction of the ultrasonic flaw detection probe (1);
Behind the second front ultrasonic flaw detection sensor row (5A), the ultrasonic flaw detection probe (1) is displaced in the circumferential direction with respect to the second front ultrasonic flaw detection sensor row (5A) A second rear ultrasonic flaw detection sensor array (5B) arranged,
The ultrasonic flaw detection probe (1)
a plurality of second front sensor holders (51) for supporting each of the plurality of ultrasonic flaw detection sensors (3) constituting the second front ultrasonic flaw detection sensor array (5A);
a plurality of second rear sensor holders (52) supporting each of the plurality of ultrasonic flaw detection sensors (3) constituting the second rear ultrasonic flaw detection sensor row (5B);
A second sensor section (53) disposed forward or rearward of the first sensor section (43) in the direction in which the axis (LA) of the ultrasonic flaw detection probe (1) extends, wherein the plurality of and a second sensor unit (53) to which the second front sensor holder (51) and the plurality of second rear sensor holders (52) are attached.

According to the configuration of 4) above, the ultrasonic flaw detection probe (1) includes a plurality of ultrasonic flaw detection sensors (3), the second front ultrasonic flaw detection sensor array (5A) and the second rear ultrasonic flaw detection sensor array (5A). By arranging in the flaw detection sensor row (5B), the number of ultrasonic flaw detection sensors (3) used for inspection of the pipe (2) can be increased, so the first front side ultrasonic flaw detection sensor row (4A) and The inspection accuracy of the ultrasonic flaw detection probe (1) can be improved compared to the case where the inspection is performed only by the first rear ultrasonic flaw detection sensor array (4B).

5) In some embodiments, the ultrasonic flaw detection probe (1) according to 4) above,
Each of the second front ultrasonic flaw detection sensor array (5A) and the second rear ultrasonic flaw detection sensor array (5B) corresponds to the first front ultrasonic flaw detection sensor array (4A) and the second ultrasonic flaw detection sensor array (4A). It is displaced in the circumferential direction of the ultrasonic flaw detection probe (1) with respect to the rear ultrasonic flaw detection sensor array (4B).

According to the configuration 5) above, the ultrasonic testing probe (1) includes the first front ultrasonic testing sensor array (4A) and the first rear ultrasonic testing sensor array (4A) in the circumferential direction of the ultrasonic testing probe (1). An inspection range in which the ultrasonic flaw detection sensor array (4B) is in charge of inspection, and an inspection range in which the second front ultrasonic flaw detection sensor array (5A) and the second rear ultrasonic flaw detection sensor array (5B) are in charge of inspection. By shifting , the plurality of ultrasonic flaw detection sensors (3) can accurately inspect the pipe (2) over a wide range in the circumferential direction of the ultrasonic flaw detection probe (1).

1 ultrasonic flaw detection probe 2 pipe 3 ultrasonic flaw detection sensor 4A first front ultrasonic flaw detection sensor row 4B first rear ultrasonic flaw detection sensor row 5A second front ultrasonic flaw detection sensor row 5B second rear Side ultrasonic flaw detection sensor array 10 Pipe inspection system 11 Cable 12 Cable guide 13 Insertion device 14 Control device 15 Information terminal device 21 Inner surface 22 Internal space 23 Outer surface 24 Bending portion 25 First header 26 Second header 27 First pipe 28 Second pipe 31 Transmission/reception surface 32 Piezoelectric element 33 Sound absorbing material 34 Sensor holder 35 Protective film 36 Coaxial cable 37, 37A, 37B Pulser receiver 41 First front side sensor holder 42 First rear side sensor holder 43 First sensor section 44 First front guide portion 45 First front brush portion 46 First rear guide portion 47 First rear brush portion 48 First metal wire 49 Connecting pin 51 Second front sensor holder 52 Second rear sensor holder 53 Second sensor section 54 Second front guide section 55 Second front brush section 56 Second rear guide section 57 Second rear brush section 58 Second metal wire 211 Spiral rib 212 End faces 311, 312 Contour shape 321 Transducer side transmitting/receiving surface DA Flaw detection area ODA Overlapping flaw detection area L Piping axis LA Ultrasonic flaw detection probe axis LB First sensor unit axis LC Second sensor unit axis RA1 Rotation shaft

3) In some embodiments, the ultrasonic flaw detection probe (1) according to 1) or 2) above,
The plurality of ultrasonic flaw detection sensors (3) are
a first front-side ultrasonic flaw detection sensor row (4A) arranged at intervals in the circumferential direction of the ultrasonic flaw detection probe (1);
Behind the first front-side ultrasonic flaw detection sensor array (4A), the ultrasonic flaw detection probe (1) is displaced in the circumferential direction with respect to the first front-side ultrasonic flaw detection sensor array (4A) A first rear ultrasonic flaw detection sensor array (4B) arranged,
The ultrasonic flaw detection probe (1)
a plurality of first front-side sensor holders (41) supporting each of the plurality of ultrasonic flaw-detection sensors (3) constituting the first front-side ultrasonic flaw-detection sensor array (4A);
a plurality of first rear sensor holders (42) supporting each of the plurality of ultrasonic flaw detection sensors (3) constituting the first rear ultrasonic flaw detection sensor row ( 4B );
A first sensor section (43) to which the plurality of first front side sensor holders (41) and the plurality of first rear side sensor holders (42) are attached is further provided.

According to the configuration of 3) above, the ultrasonic flaw detection probe (1) includes a plurality of ultrasonic flaw detection sensors (3), the first front ultrasonic flaw detection sensor row (4A) and the first rear ultrasonic flaw detection sensor array (4A). By arranging them in the flaw detection sensor array (4B), it is possible to inspect the pipe (2) over a wide range in the circumferential direction of the ultrasonic flaw detection probe (1) without rotating the first sensor part (43). Since the ultrasonic flaw detection probe (1) does not need to rotate the first sensor unit (43) when inspecting the pipe (2), it realizes high-speed inspection compared to the case where it has a rotation mechanism that rotates the sensor unit. can. Since the number of ultrasonic flaw detection sensors (3) used to inspect the pipe (2) can be increased, the inspection accuracy of the ultrasonic flaw detection probe (1) can be improved.

Claims (5)

An ultrasonic flaw detection probe inserted inside a pipe,
A plurality of ultrasonic flaw detection sensors having a transmitting/receiving surface capable of transmitting and receiving ultrasonic waves and arranged in a circumferential direction of the ultrasonic flaw detection probe,
The transmission/reception surface of each of the plurality of ultrasonic flaw detection sensors has a contour shape that curves convexly in a direction away from the axis of the ultrasonic flaw detection probe in a cross section perpendicular to the axis of the ultrasonic flaw detection probe. and having a contour shape that curves concavely toward the axis of the ultrasonic flaw detection probe in a cross section along the axis of the ultrasonic flaw detection probe,
Ultrasonic flaw detection probe. Each of the plurality of ultrasonic flaw detection sensors has an overlapping flaw detection region, which is a portion where the flaw detection regions of the other ultrasonic flaw detection sensors adjacent to each other in the circumferential direction of the ultrasonic flaw detection probe overlap each other. placed,
The ultrasonic flaw detection probe according to claim 1. The plurality of ultrasonic flaw detection sensors are
a first front-side ultrasonic flaw detection sensor row arranged at intervals in the circumferential direction of the ultrasonic flaw detection probe;
A first rear ultrasonic flaw detection sensor arranged behind the first front ultrasonic flaw detection sensor array and displaced in the circumferential direction of the ultrasonic flaw detection probe with respect to the first front ultrasonic flaw detection sensor array an array of sonic flaw sensors;
The ultrasonic flaw detection probe is
a plurality of first front side sensor holders for supporting each of the plurality of ultrasonic flaw detection sensors constituting the first front side ultrasonic flaw detection sensor array;
a plurality of first rear-side sensor holders for supporting each of the plurality of ultrasonic flaw-detection sensors constituting the first rear-side ultrasonic flaw-detection sensor array;
a first sensor unit to which the plurality of first front side sensor holders and the plurality of first rear side sensor holders are attached;
The ultrasonic flaw detection probe according to claim 1 or 2. The plurality of ultrasonic flaw detection sensors are
a second front-side ultrasonic flaw detection sensor row arranged at intervals in the circumferential direction of the ultrasonic flaw detection probe;
A second rear ultrasonic testing probe disposed behind the second front ultrasonic testing sensor array and displaced in the circumferential direction of the ultrasonic testing probe with respect to the second front ultrasonic testing sensor array an array of sonic flaw sensors;
The ultrasonic flaw detection probe is
a plurality of second front-side sensor holders supporting each of the plurality of ultrasonic flaw-detection sensors constituting the second front-side ultrasonic flaw-detection sensor array;
a plurality of second rear-side sensor holders for supporting each of the plurality of ultrasonic flaw-detection sensors constituting the second rear-side ultrasonic flaw-detection sensor array;
A second sensor unit disposed forward or rearward of the first sensor unit in the direction in which the axis of the ultrasonic flaw detection probe extends, wherein the plurality of second front side sensor holders and the plurality of A second sensor unit to which a second rear sensor holder is attached,
The ultrasonic flaw detection probe according to claim 3. The second front ultrasonic flaw detection sensor array and the second rear ultrasonic flaw detection sensor array are respectively the first front ultrasonic flaw detection sensor array and the first rear ultrasonic flaw detection sensor array. arranged shifted in the circumferential direction of the ultrasonic flaw detection probe with respect to
The ultrasonic flaw detection probe according to claim 4.

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