JP5720195B2 - Ultrasonic flaw detector - Google Patents

Description

  The present invention relates to an ultrasonic flaw detector.

  In normal ultrasonic testing, an ultrasonic contact medium such as water, machine oil, or glycerin is applied to the surface of the object to be inspected by the ultrasonic probe to ensure penetration of the ultrasonic wave into the object. In the case of automatic ultrasonic flaw detection, the ultrasonic contact medium is often automatically supplied together with the automatic scanning of the ultrasonic probe, but the ultrasonic contact medium is not automatically recovered. It was.

  Patent Document 1 below discloses an ultrasonic contact medium automatic supply and recovery device that supplies and recovers an ultrasonic contact medium. This apparatus includes an ultrasonic contact medium suction box fitted around a probe surface of an ultrasonic probe and filled with a porous metal in an opening on the probe surface side, and a recovery hose attached to the suction box. A connected recovery tank and an air pump are provided, and the supplied ultrasonic contact medium is absorbed by the porous metal, and the absorbed ultrasonic contact medium is recovered by the air pump to the recovery tank via the recovery hose. ing.

Japanese Patent Laid-Open No. 3-245056

By the way, in the above-described prior art, the porous metal absorbs and recovers the ultrasonic contact medium while rubbing against the surface of the object to be inspected as the ultrasonic probe travels. Made of nickel material with excellent durability and durability.
However, the surface of the object to be inspected (pressure vessel surface in the prior art) is usually not a smooth surface, and there are not a few irregularities. There is a risk that it will interfere with the smooth running of the ultrasonic probe. In addition, when the surface of the object to be inspected is rubbed by the rubbing and taken into the porous metal together with the ultrasonic contact medium, the porous metal may be clogged, and the absorption performance may be drastically reduced. is there. In addition, the replacement of the porous metal whose absorption performance has been lowered has a problem that the material is expensive, and thus costs are increased.

  The present invention has been made in view of the above-described problems, and provides an ultrasonic flaw detector that can suppress a decrease in absorption performance of an ultrasonic contact medium without inhibiting the traveling of the ultrasonic probe. Objective.

In order to solve the above-described problems, the present invention provides a traveling device that travels an ultrasonic probe along the surface of an object to be inspected, and an ultrasonic contact medium supply device that supplies an ultrasonic contact medium to the surface of the object to be inspected. And an ultrasonic contact medium recovery device that surrounds the ultrasonic probe and absorbs and recovers the supplied ultrasonic contact medium, and the ultrasonic contact medium recovery device Has a configuration in which at least the outer peripheral portion is formed of a porous material and has a porous rolling element that absorbs the ultrasonic contact medium while rolling on the surface of the object to be inspected as the ultrasonic probe travels. adopt.
By adopting this configuration, in the present invention, the porous rolling element having an outer peripheral portion formed of a porous material rolls on the surface of the object to be inspected as the ultrasonic probe travels. Relative rubbing between the inspection object surface and the outer peripheral surface of the porous rolling element can be reduced. For this reason, the frictional force acting between the surface of the object to be inspected and the outer peripheral surface of the porous rolling element is reduced, and smooth running of the ultrasonic probe can be ensured. Further, the removal of rust and the like on the surface of the object to be inspected is reduced, and clogging is less likely to occur. Furthermore, since there is no restriction on wear resistance or the like as in the prior art, the range of selection of the porous material is widened, and a porous elastic body such as a sponge material having a low cost and excellent absorption performance can be employed.

Further, in the present invention, the outer peripheral portion of the porous rolling element is formed of a porous elastic body, and the ultrasonic contact medium recovery device is a part on the rolling path of the porous rolling element, A configuration is adopted in which a suction nozzle that sucks the absorbed ultrasonic contact medium while pressing and elastically deforming the outer peripheral portion is employed.
By adopting this configuration, in the present invention, the outer peripheral portion of the porous rolling element is formed from a porous elastic body. If the outer peripheral part formed from this porous elastic body is pressed and elastically deformed by a suction nozzle, the ultrasonic contact medium absorbed inside can be sucked out and the suction efficiency is improved. Moreover, if this suction nozzle is provided in a part of the rolling path of the porous rolling element, the outer peripheral part absorbing the ultrasonic contact medium is successively sent by the rolling of the porous rolling element, and the result The ultrasonic contact medium can be sucked over the entire outer periphery.

Moreover, in this invention, the structure that the suction nozzle is provided over the width direction orthogonal to the rolling direction of a porous rolling element is employ | adopted.
By adopting this configuration, in the present invention, the suction nozzle can suck the ultrasonic contact medium across the width direction of the porous rolling element.

In the present invention, the porous rolling element includes a pair of sponge rollers that roll on both sides of the traveling direction of the ultrasonic probe, and endless rolling on both sides in the width direction perpendicular to the traveling direction of the ultrasonic probe. And a pair of sponge belts.
By adopting this configuration, in the present invention, the ultrasonic contact medium can be collected without omission by enclosing the four sides of the ultrasonic probe with a sponge roller and a sponge belt.

According to the present invention, a traveling device that travels an ultrasonic probe along the surface of an object to be inspected, an ultrasonic contact medium supply device that supplies an ultrasonic contact medium to the surface of the object to be inspected, and an ultrasonic probe And an ultrasonic contact medium recovery device that absorbs and recovers the supplied ultrasonic contact medium, and the ultrasonic contact medium recovery device has at least an outer peripheral portion that is porous. By adopting a configuration that is formed of a material and has a porous rolling element that absorbs the ultrasonic contact medium while rolling on the surface of the inspection object as the ultrasonic probe travels, Since the porous rolling element formed of a porous material rolls on the surface of the object to be inspected as the ultrasonic probe travels, it is between the surface of the object to be inspected and the outer peripheral surface of the porous rolling element. The relative rubbing can be reduced. For this reason, the frictional force acting between the surface of the object to be inspected and the outer peripheral surface of the porous rolling element is reduced, and smooth running of the ultrasonic probe can be ensured. Further, the removal of rust and the like on the surface of the object to be inspected is reduced, and clogging is less likely to occur. Furthermore, since there is no restriction on wear resistance or the like as in the prior art, the range of selection of the porous material is widened, and a porous elastic body such as a sponge material having a low cost and excellent absorption performance can be employed.
Therefore, in the present invention, it is possible to suppress a decrease in the absorption performance of the ultrasonic contact medium without inhibiting the traveling of the ultrasonic probe.

It is the schematic which shows the installation state with respect to the reactor pressure vessel of the ultrasonic flaw detector in embodiment of this invention. 1 is a perspective view showing an ultrasonic flaw detector according to an embodiment of the present invention. 1 is a perspective view showing an ultrasonic flaw detector according to an embodiment of the present invention. It is a perspective view which shows the structure of the holder mechanism in embodiment of this invention. It is a disassembled perspective view of the holder mechanism in embodiment of this invention. It is a bottom view of the holder mechanism in the embodiment of the present invention. It is a perspective view which shows the structure of the suction nozzle in embodiment of this invention. It is a figure which shows the pressing state with respect to the porous rolling element of the suction nozzle in embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing an installation state of an ultrasonic flaw detector 10 in a reactor pressure vessel 1 according to an embodiment of the present invention.
As shown in the figure, a heat insulating material 2 is installed around a reactor pressure vessel (inspected object) 1. The heat insulating material 2 is supported on a reactor shielding wall 3 surrounding the reactor pressure vessel 1 by a heat insulating material supporting bracket, a support, or the like. The reactor shielding wall 3 is provided with a manhole 4 for an operator to enter the interior when performing an ultrasonic flaw detection test.

  An inspection headquarter 10 a of the ultrasonic flaw detector 10 installed in the reactor pressure vessel 1 is installed outside the reactor shielding wall 3. The inspection headquarter 10a includes a control unit that controls driving of the ultrasonic flaw detection apparatus 10, an inspection analysis unit that performs inspection and analysis based on the result of the ultrasonic flaw detection test, and an ultrasonic wave that is used when performing the ultrasonic flaw detection test. An ultrasonic contact medium supply tank including an ultrasonic contact medium supply tank and a pump for supplying a contact medium (water in this embodiment) to the ultrasonic flaw detector 10 and an ultrasonic contact medium used for the ultrasonic flaw detection test are collected. And an ultrasonic contact medium recovery part including an ultrasonic contact medium recovery tank.

2 and 3 are perspective views showing the ultrasonic flaw detector 10 according to the embodiment of the present invention.
As shown in the figure, an ultrasonic flaw detector 10 of this embodiment includes a rail 11 extending in a predetermined direction, and an ultrasonic probe 12 mounted on the rail 11 and movable in a predetermined direction along the rail 11. And have. The ultrasonic probe 12 is supported by a holder mechanism 13 that is movable along the rail 11. The holder mechanism 13 has a three-stage slide pressing mechanism that presses the ultrasonic probe 12 against the surface 1 a of the reactor pressure vessel 1. The holder mechanism 13 is mounted on a traveling device 17 that includes a drive motor 14 and a driven pulley 15 and a carriage that travels along the rail 11 by a revolving drive of a drive belt 16 installed between them. A level meter (not shown) is attached to the rail 11.

  The ultrasonic flaw detector 10 is installed on the surface 1 a of the reactor pressure vessel 1 by an installation mechanism 20. The installation mechanism 20 supports the first frame 21 detachably installed on the surface 1a of the reactor pressure vessel 1 and the rail 11 along the surface 1a, and around a rotation axis perpendicular to the surface 1a. A second frame 30 that is rotatable and supported by the first frame 21 and a positioning member 40 that positions the position of the second frame 30 in the rotation direction are included.

  The first frame 21 has four legs. Two of the legs are composed of a magnetized part 22 that is electromagnetically magnetized to the surface 1a by an electromagnet, and the other two are composed of an adjuster foot 23 that can swing. A support frame 24 that supports the second frame 30 is fixed to the center portion of the first frame 21 via a cross roller bearing (not shown). The second frame 30 has an annular handle portion 32 having the rotation axis as an axis. The handle portion 32 is used when adjusting the installation angle of the rail 11 to ensure the levelness. The positioning member 40 has a clamp mechanism that can lock the handle portion 32 by lever operation. The second frame 30 is provided with a slide mechanism 33 that slides the rail 11 in the width direction orthogonal to the length direction. The slide mechanism 33 includes a first guide portion 34 and a second guide portion 35 that support the rail 11 so as to be movable in the width direction. The first guide part 34 is composed of an LM guide, and the second guide part 35 is composed of a ball screw guide. When the operation handle 37a of the second guide portion 35 is rotated, the rail 11 can be slid in the width direction.

FIG. 4 is a perspective view showing the configuration of the holder mechanism 13 in the embodiment of the present invention. FIG. 5 is an exploded perspective view of the holder mechanism 13 in the embodiment of the present invention. FIG. 6 is a bottom view of the holder mechanism 13 in the present embodiment. FIG. 7 is a perspective view showing the configuration of the suction nozzle 80 in the embodiment of the present invention. FIG. 8 is a diagram illustrating a state in which the suction nozzle 80 is pressed against the porous rolling element 71 in the embodiment of the present invention.
As shown in FIG. 4, the holder mechanism 13 has a holder case 51 supported by the gimbal 50. In addition to the ultrasonic probe 12, the holder case 51 includes an ultrasonic contact medium supply system (ultrasonic contact medium supply device) 60 that supplies an ultrasonic contact medium to the surface 1 a of the reactor pressure vessel 1, and an atom. An ultrasonic contact medium recovery system (ultrasonic contact medium recovery device) 70 that absorbs and recovers the ultrasonic contact medium supplied to the surface 1a of the furnace pressure vessel 1 is provided.

The ultrasonic contact medium supply system 60 includes an ultrasonic contact medium supply unit of the inspection headquarter 10a.
The ultrasonic contact medium supply system 60 includes a branch unit 62 that branches the ultrasonic contact medium supplied from the inspection headquarter 10 a into four tubes 61. The four tubes 61 connected to the branch portion 62 are connected to communicate with supply ports 63 (see FIG. 6) formed at the four corners of the probe shoe of the ultrasonic probe 12.

The ultrasonic contact medium recovery system 70 includes an ultrasonic contact medium recovery unit of the inspection headquarter 10a.
As shown in FIGS. 5 and 6, the ultrasonic contact medium recovery system 70 is formed of a porous material at least on the outer periphery, and on the surface 1 a of the reactor pressure vessel 1 as the ultrasonic probe 12 travels. And a porous rolling element 71 that absorbs the ultrasonic contact medium supplied from the ultrasonic contact medium supply system 60.
The porous rolling element 71 includes a pair of sponge belts 72 whose outer peripheral portion is formed of a sponge material (porous elastic body), and a pair of sponge rollers 73 whose outer peripheral portion is also formed of a sponge material. . The sponge roller 73 is provided on both sides of the traveling direction of the ultrasonic probe 12 (left and right direction in FIG. 6). The sponge belt 72 is provided on both sides in the width direction (up and down direction in FIG. 6) perpendicular to the traveling direction of the ultrasonic probe 12.

  The sponge belt 72 is configured by providing a polyurethane sponge (Sofras (trade name) in the present embodiment) around the timing belt. The sponge roller 73 is configured by providing a polyurethane sponge (Sofras (trade name) in this embodiment) around a hollow cylindrical resin core material (in this embodiment, a vinyl chloride core). In the present embodiment, the sponge belt 72 and the sponge roller 73 are always rotated in synchronization, and the gear of the sponge belt 72 and the core of the sponge roller 73 are passed through the shaft 74 in order to ensure a stable and uniform water absorption amount. It is fixed coaxially. The shaft 74 is rotatably supported by the holder case 51 via a bearing 75.

  The ultrasonic contact medium recovery system 70 includes a suction nozzle 80 (80A) that elastically deforms by pressing an outer peripheral portion of a part of a rolling path along which the sponge belt 72 rolls endlessly, and a roll in which the sponge roller 73 rolls. A suction nozzle 80 (80B) that presses the outer periphery of the moving path and elastically deforms it is provided (see FIGS. 4 and 5). Two suction nozzles 80 </ b> A are provided corresponding to each sponge belt 72. Further, two suction nozzles 80B are provided corresponding to each sponge roller 73. The suction nozzles 80A and 80B are supported by the holder case 51, respectively. The suction port 81 of the suction nozzle 80A is enlarged so as to cover the entire width direction of the sponge belt 72 as shown in FIG. The suction port 81 of the suction nozzle 80B is enlarged so as to cover the entire width direction of the sponge roller 73, as shown in FIG.

  As shown in FIG. 8, the suction nozzle 80 </ b> A is provided by pressing the suction port 81 against the outer peripheral portion of the sponge belt 72. The suction nozzle 80 </ b> A includes a pressing amount adjusting mechanism 90 that adjusts the pressing amount with respect to the outer peripheral portion of the sponge belt 72. The pressing amount adjusting mechanism 90 includes a flange 91 that is integrally fixed to the suction nozzle 80 </ b> A, and a screw member 92 that is provided on the flange 91 and is screwed into the holder case 51. According to this configuration, the pressing amount of the suction nozzle 80A against the outer peripheral portion of the sponge belt 72 is adjusted by adjusting the screwing amount of the screw member 92 into the holder case 51. The suction nozzle 80B has the same configuration and includes a pressing amount adjusting mechanism 90.

  The suction nozzle 80 is provided with a suction tube attachment port 82 that communicates with the suction port 81. As shown in FIG. 4, a tube 84 connected to a suction vacuum generator 83 is detachably attached to the suction tube attachment port 82. The suction vacuum generator 83 causes the high-pressure air supplied from the inspection headquarter 10a to flow toward the tube 86 through the branching portion 85, thereby bringing the inside of the tube 84 connected to the branching portion 85 into a negative pressure state. In addition, the suction nozzle 80 is caused to exert a suction force, and the ultrasonic contact medium sucked from the suction nozzle 80 is discharged toward the tube 86 together with the high-pressure air. The tube 86 is connected to the ultrasonic contact medium recovery tank of the inspection headquarter 10a.

In the present embodiment, if suction is simultaneously performed by all the four suction nozzles 80, a sufficient suction force cannot be obtained by the suction vacuum generator 83. Therefore, the porous material at the position where the ultrasonic contact medium is most absorbed is obtained. The tube 84 is connected only to the suction nozzle 80A provided corresponding to the rolling element 71 (in this embodiment, the sponge belt 72 positioned below the ultrasonic probe 12 during the ultrasonic flaw detection test). .
Note that the porous rolling element 71 at the position where the ultrasonic contact medium is most absorbed varies depending on the installation position and the installation angle of the ultrasonic flaw detector 10 with respect to the reactor pressure vessel 1. 84 is preferably replaced. Incidentally, if a sufficient suction force can be obtained by the suction vacuum generator 83, a configuration in which suction is simultaneously performed by all four suction nozzles 80 may be employed.

Next, the recovery operation of the ultrasonic contact medium in the ultrasonic flaw detection test using the ultrasonic flaw detection apparatus 10 having the above configuration will be described.
In running the ultrasonic probe 12 along the surface 1 a of the reactor pressure vessel 1, first, the ultrasonic probe 12 is pressed against the surface 1 a using the pressing mechanism of the holder mechanism 13. At this time, the outer peripheral part of the porous rolling element 71 rotatably supported by the holder case 51 of the holder mechanism 13 contacts the surface 1a. Next, the ultrasonic contact medium supply system 60 supplies the ultrasonic contact medium to the surface 1a. Specifically, the ultrasonic contact medium pumped by the pump from the ultrasonic contact medium supply tank provided in the inspection headquarter 10 a branches into four tubes 61 at the branching section 62, and atoms are supplied from the supply ports 63. It is supplied to the surface 1 a of the furnace pressure vessel 1. The ultrasonic contact medium flowing out from the supply port 63 spreads on the probe surface of the ultrasonic probe 12 and fills a minute gap between the probe surface and the surface 1a, thereby effectively applying ultrasonic waves to the reactor pressure. The container 1 is penetrated.

  When the ultrasonic probe 12 travels along the rail 11 by the travel device 17, the porous rolling element 71 rolls on the surface 1 a of the reactor pressure vessel 1 accordingly. The ultrasonic contact medium is continuously supplied as the ultrasonic probe 12 travels, and the material moved from the probe surface of the ultrasonic probe 12 is applied to the surface 1a of the reactor pressure vessel 1 by its own weight. Dripping along. The ultrasonic contact medium that drips down contacts and is absorbed by the porous rolling element 71 that rolls on the surface 1a around the four sides of the ultrasonic probe 12. In the present embodiment, the drooped ultrasonic contact medium is mainly absorbed by the sponge belt 72 located below the ultrasonic probe 12.

  The ultrasonic contact medium absorbed by the sponge belt 72 rolls together with the sponge belt 72 as the ultrasonic probe 12 travels, and reaches a position where the suction nozzle 80A is provided (see FIG. 8). At this position, since the suction nozzle 80A presses the outer peripheral portion of the sponge belt 72 by a predetermined amount in the width direction, the ultrasonic contact medium that cannot be held by the elastic deformation is the surface of the outer peripheral portion of the sponge belt 72. It will ooze out. The ultrasonic contact medium that has oozed out on the outer peripheral surface is sucked from the suction port 81 in a negative pressure state by the suction vacuum generator 83, flows through the tube 84, and reaches the branching portion 85. Then, the ultrasonic contact medium that reaches the branching portion 85 is guided to the tube 86 together with the high-pressure air, and is recovered in the ultrasonic contact medium recovery tank of the inspection head unit 10a.

Therefore, according to the above-described embodiment, the traveling device 17 that travels the ultrasonic probe 12 along the surface 1a of the reactor pressure vessel 1 and the ultrasonic contact medium on the surface 1a of the reactor pressure vessel 1 are provided. An ultrasonic contact medium supply system 60 for supplying and an ultrasonic contact medium recovery system 70 that surrounds the ultrasonic probe 12 and absorbs and recovers the supplied ultrasonic contact medium. In the ultrasonic flaw detector 10, the ultrasonic contact medium recovery system 70 is formed of a porous material at least on the outer periphery, and moves on the surface 1 a of the reactor pressure vessel 1 as the ultrasonic probe 12 travels. By adopting the configuration of having the porous rolling element 71 that absorbs the ultrasonic contact medium while rolling, the relative relationship between the surface 1a of the reactor pressure vessel 1 and the outer peripheral surface of the porous rolling element 71 is achieved. To reduce general rubbing Door can be. For this reason, the frictional force acting between the surface 1a of the reactor pressure vessel 1 and the outer peripheral surface of the porous rolling element 71 is reduced, and smooth running of the ultrasonic probe 12 can be ensured. Further, the removal of rust and the like on the surface 1a of the reactor pressure vessel 1 is reduced, and clogging is less likely to occur. Further, since there is no restriction on wear resistance or the like as in the prior art, the selection range of porous materials is widened, and a sponge material with excellent absorption performance can be used at low cost.
Therefore, in the present embodiment, it is possible to suppress a decrease in the absorption performance of the ultrasonic contact medium without inhibiting the traveling of the ultrasonic probe 12.

  In the present embodiment, the outer periphery of the porous rolling element 71 is formed of a sponge material, and the ultrasonic contact medium recovery system 70 is partly on the rolling path of the porous rolling element 71. By adopting a configuration in which the suction nozzle 80 sucks the absorbed ultrasonic contact medium while pressing the outer periphery and elastically deforming the outer periphery, the suction nozzle 80 presses the outer periphery formed from the sponge material. When elastically deformed, the ultrasonic contact medium absorbed inside can be sucked out while being oozed out, and the suction efficiency is improved. Further, if this suction nozzle 80 is provided in a part of the rolling path of the porous rolling element 71, the outer peripheral part absorbing the ultrasonic contact medium is successively sent by the rolling of the porous rolling element 71. As a result, the ultrasonic contact medium can be sucked over the entire outer peripheral portion. In the present embodiment, the suction nozzle 80 is provided in a width direction orthogonal to the rolling direction of the porous rolling element 71, thereby adopting a configuration in which the porous rolling element 71 has a width direction. It is possible to suck the ultrasonic contact medium over a wide range.

  Further, in the present embodiment, the porous rolling element 71 includes a pair of sponge rollers 73 that roll on both sides of the traveling direction of the ultrasonic probe 12 and a width direction that is orthogonal to the traveling direction of the ultrasonic probe 12. By adopting a configuration that includes a pair of sponge belts 72 that endlessly roll on both sides, the ultrasonic probe 12 is surrounded by the sponge roller 73 and the sponge belt 72 so that the ultrasonic contact medium Recovery can be performed without omission.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the above embodiment, the reactor pressure vessel has been exemplified and described as the object to be inspected. However, the present invention is not limited to this, and the present invention can be applied to other pressure vessels. Further, the present invention is not limited to the pressure vessel but can be applied to other cylindrical inspection objects.

  For example, although the porous rolling element 71 demonstrated the structure which does not have drive devices, such as a motor, in the said embodiment, the structure which has a drive device may be sufficient. In this case, the drive device is preferably controlled so that the rolling drive of the porous rolling element 71 is synchronized with the traveling drive of the ultrasonic probe 12 by the traveling device 17. According to this configuration, the ultrasonic probe 12 can travel more smoothly.

  DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel (inspection object), 1a ... Surface, 10 ... Ultrasonic flaw detector, 12 ... Ultrasonic probe, 17 ... Traveling device, 60 ... Ultrasonic contact medium supply system (Ultrasonic contact medium supply) 70) Ultrasonic contact medium recovery system (ultrasonic contact medium recovery apparatus), 71 ... Porous rolling element, 72 ... Sponge belt, 73 ... Sponge roller, 80 (80A, 80B) ... Suction nozzle

Claims (4)

A traveling device for running the ultrasonic probe along the surface of the object to be inspected, an ultrasonic contact medium supply device for supplying the ultrasonic contact medium to the surface of the object to be inspected, and surrounding the ultrasonic probe An ultrasonic flaw detector having an ultrasonic contact medium recovery device that absorbs and recovers the supplied ultrasonic contact medium,
The ultrasonic contact medium recovery device includes:
A porous rolling element having at least an outer peripheral portion formed of a porous elastic material and absorbing the ultrasonic contact medium while rolling on the surface of the object to be inspected as the ultrasonic probe travels. ,
An ultrasonic nozzle comprising: a suction nozzle that sucks the absorbed ultrasonic contact medium while pressing and elastically deforming the outer peripheral part in a part of a rolling path of the porous rolling element Flaw detection equipment. The ultrasonic flaw detector according to claim 1 , wherein the suction nozzle is provided across a width direction orthogonal to a rolling direction of the porous rolling element. The porous rolling element is
A pair of sponge rollers that roll on both sides of the traveling direction of the ultrasonic probe;
The ultrasonic flaw detector according to claim 1 or 2 , further comprising: a pair of sponge belts that endlessly roll on both sides in the width direction orthogonal to the traveling direction of the ultrasonic probe. A traveling device for running the ultrasonic probe along the surface of the object to be inspected, an ultrasonic contact medium supply device for supplying the ultrasonic contact medium to the surface of the object to be inspected, and surrounding the ultrasonic probe An ultrasonic flaw detector having an ultrasonic contact medium recovery device that absorbs and recovers the supplied ultrasonic contact medium,
The ultrasonic contact medium recovery device includes:
At least an outer peripheral portion is formed of a porous material, and has a porous rolling element that absorbs the ultrasonic contact medium while rolling on the surface of the inspection object as the ultrasonic probe travels. ,
The porous rolling element is
A pair of sponge rollers that roll on both sides of the traveling direction of the ultrasonic probe;
An ultrasonic flaw detector comprising: a pair of sponge belts that roll endlessly on both sides in the width direction perpendicular to the traveling direction of the ultrasonic probe.

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