Ultrasonic flaw detection device

Abstract

To provide ultrasonic test equipment that inspects a device under test that has a curve surface and a rugged surface.SOLUTION: Ultrasonic test equipment 10 comprises a probe 16 where ultrasonic vibration elements 15 are arranged in a longer direction, a cylindrical sheet 18 that holds liquid medium 17 inside in a state where this probe 16 is accommodated and the outer peripheral surface of which contacts a device under test 51, a first plate 21 that is born with a frame 25 and the probe 16 in a fixed end in a rotatable manner and to which one end of the cylindrical sheet 18 is fixed, a second plate 22 that is born with the frame 25 at a position opposite to the first plate 21 in a rotatable manner and to which the other end of the cylindrical sheet 18 is fixed, a rolling element 35 that is born with the frame 25 in a rotatable manner and rotates by friction transmission when contacting the device under test 51 and conducting translation motion, and rotation transmission members 36 (36a, 36b) that transmit the rotation movement of the rolling element to a first pulley 31 and a second pulley 32.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to an ultrasonic flaw detector that performs non-destructive testing for defects in an object to be inspected by using ultrasonic waves. [Background technology]

[0002] In ultrasonic testing, an electric pulse is input to an ultrasonic vibration element, and mechanical vibration of the pulsed ultrasonic waves is propagated on the surface or inside of a test object such as a metal material. Then, the strength and propagation time of the reflected signal from an acoustically discontinuous part are measured to inspect the presence or absence of defects on the surface or inside of the test object, as well as their shapes, etc. In this way, ultrasonic testing is a non-destructive technique for evaluating the soundness of a test object, and is used in various fields.

[0003] Since ultrasonic testing is based on the above-mentioned measurement principle, it is necessary to bring the transducer into close contact with the surface of the test object and to efficiently transmit ultrasonic waves. When testing a test object with a curved or uneven surface, the transducer is placed in contact with the surface of the test object without leaving any gaps, using an elastic medium such as hydrogel, rubber, or konjac that has low ultrasonic attenuation. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Unexamined Japanese Patent Publication No. 2015-108523 Summary of the Invention [Problem to be solved by the invention]

[0005] In the case of a specimen with a large surface curvature or unevenness, there is a concern that the above-mentioned elastic medium may have an area where it cannot adhere to the surface of the specimen due to the limit of elastic deformation. In addition, in the case of a specimen with a wide and continuous curved or uneven surface, the above-mentioned elastic medium continues to slide on the surface of the specimen. In this case, shear stress and friction force are continuously applied to the elastic medium, and there is a concern that the accuracy of the ultrasonic flaw detection test may decrease as the elastic medium deteriorates.

[0006] The embodiments of the present invention have been made in consideration of the above circumstances, and an object of the present invention is to provide an ultrasonic flaw detector that can inspect an object having a curved or uneven surface with high accuracy. [Means for solving the problem]

[0007] In the ultrasonic flaw detection device according to the embodiment, a probe in which ultrasonic vibration elements are arranged in a longitudinal direction, a cylindrical sheet that holds the probe and a liquid medium therein and whose outer circumferential surface is in contact with a test object, a frame to which one end of the probe is fixed, a first plate rotatably supported on the probe on the fixed end side of the frame and to which one end of the cylindrical sheet is fixed, a second plate rotatably supported on the frame at a position opposite to the first plate and to which the other end of the cylindrical sheet is fixed, a first pulley provided coaxially with the first plate, a second pulley provided coaxially with the second plate, a rolling element rotatably supported on the frame, in contact with the subject, and rotating by friction transmission when moving in a translational manner, and a rotation transmission member that transmits the rotational motion of the rolling element to the first pulley and the second pulley. Equipped with. Effect of the Invention

[0008] An embodiment of the present invention provides an ultrasonic flaw detector that inspects an object having a curved or uneven surface with high accuracy. [Brief description of the drawings]

[0009] [Figure 1] 1 is a bottom perspective view of an ultrasonic flaw detection device according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective side view of an ultrasonic flaw detection device according to a first embodiment. [Diagram 3] FIG. 11 is a perspective side view of an ultrasonic flaw detection device according to a second embodiment. [Figure 4] FIG. 5 is a cross-sectional view taken along line AA of the ultrasonic flaw detection device according to the second embodiment. [Diagram 5] FIG. 5 is a BB cross-sectional view of an ultrasonic flaw detection apparatus according to a second embodiment. [Figure 6] FIG. 6 is a CC sectional view of an ultrasonic flaw detection apparatus according to a second embodiment. [Figure 7] 6A is a DD cross-sectional view of an ultrasonic flaw detection device according to a second embodiment, and FIG. 6B is a DD cross-sectional view of an ultrasonic flaw detection device according to a modified example of the second embodiment. [Figure 8] FIG. 13A is a perspective side view of an ultrasonic flaw detection device according to a third embodiment, and FIG. 13B is a view showing an upward displacement of a frame in the third embodiment. [Figure 9] FIG. 13 is a diagram showing a frame rotated and displaced in the third embodiment. [Figure 10] FIG. 11 is a perspective side view of an ultrasonic flaw detection device according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (First embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a bottom perspective view of an ultrasonic flaw detection device 10A (10) according to a first embodiment of the present invention, and Fig. 2 is a side perspective view. In the drawings, components that only perform translational motion as the ultrasonic flaw detection device 10 travels are hatched with diagonal lines, and components that also perform translational motion are shown in white.

[0011] Thus, the ultrasonic flaw detection device 10 comprises a probe 16 having ultrasonic vibration elements 15 arranged in the longitudinal direction, and a tubular sheet 18 which contains the probe 16, holds a liquid medium 17 therein, and has its outer surface in contact with the specimen 51.

[0012] The ultrasonic flaw detection device 10 further includes a frame 25 to which one end of the probe 16 is fixed, a first plate 21 which is rotatably supported on the fixed end side of the probe 16 relative to the frame 25 and to which one end of the tubular sheet 18 is fixed, and a second plate 22 which is rotatably supported on the frame 25 at a position opposite the first plate 21 and to which the other end of the tubular sheet 18 is fixed.

[0013] The ultrasonic flaw detection equipment 10 further includes a first pulley 31 arranged coaxially with the first plate 21, a second pulley 32 arranged coaxially with the second plate 22, a rolling body 35 that is rotatably supported on the frame 25 and rotates by friction transmission when it comes into contact with the specimen 51 and moves in a translational manner, and a rotation transmission member 36 (36a, 36b) that transmits the rotational motion of the rolling body to the first pulley 31 and the second pulley 32.

[0014] Probe 16 has a fixed end fixed inside frame 25, and its tip is a free end. A plurality of transducer elements 15 are arranged in the longitudinal direction of probe 16 within a predetermined range from the tip of probe 16. These transducer elements 15 are provided on the surface of probe 16 so that ultrasonic waves travel in a direction perpendicular to the plane of frame 25.

[0015] The probe 16 is housed inside the cylindrical sheet 18 and serves as the central axis of the rotating cylindrical sheet 18. The probe 16 in the portion where the vibration elements 15 are arranged is formed to be thicker than the fixed end portion within a range not exceeding the outer diameter of the first plate 21, and is configured so that the vibration elements 15 are close to the surface of the specimen 51.

[0016] When a pulsed voltage signal is input, the transducer element 15 is excited and emits an ultrasonic wave. This ultrasonic wave propagates through the liquid medium 17, enters the specimen 51, and then propagates inside the specimen 51. A part of the ultrasonic wave propagating inside the specimen 51 is reflected by the defect 53, propagates along the reverse route, and is input to the transducer element 15. The echo of the ultrasonic wave thus input excites the transducer element 15 to output a voltage signal. Then, by analyzing the strength and propagation time of the voltage signal of this echo, the location and size of the defect 53 inside the specimen 51 can be known.

[0017] The cylindrical sheet 18 has a hollow shape that holds the liquid medium 17 therein, and has sufficient flexibility to conform to the surface shape of the specimen 51 when the circumferential surface of the cylindrical sheet 18 comes into contact with the specimen 51. Specifically, a silicone gel or the like that has low elasticity and excellent extensibility is used for the cylindrical sheet 18. There are no particular limitations on the material of the cylindrical sheet 18, and any material that elastically deforms with a high elongation rate under low stress and does not creep even when stress is continuously applied is appropriately used.

[0018] Both ends of the cylindrical sheet 18 have a cut-off shape and are fixed to a first plate 21 and a second plate 22, each of which has the same diameter. The first plate 21 and the second plate 22 are connected to the cylindrical sheet 18 in a watertight manner by sandwiching the edge of the cylindrical sheet 18 between the inner peripheral surface of a side wall 27 erected on the outer periphery of the first plate 21 and the second plate 22 and the outer peripheral surface of a ring body 28.

[0019] There is no particular limitation on the method of connecting the first plate 21 and the second plate 22 to both ends of the cylindrical sheet 18, and any method can be used as long as it can keep the liquid medium 17 watertight. In this way, the cylindrical sheet 18 that holds the liquid medium 17 inside can be closely fitted to the curved or uneven surface of the test piece 51, so that the ultrasonic flaw detector 10 can perform a flaw detection test with high accuracy.

[0020] The first plate 21 is provided with a seal member 29 so as to rotate watertightly with respect to the probe 16 that passes through the center of the first plate 21. An example of the seal member 29 is an O-ring. The first plate 21 is provided with a first pulley 31 coaxially on the surface opposite to the surface to which the cylindrical sheet 18 is connected. The first pulley 31 is rotatably supported by the probe 16 via a bearing 11. As a result, the first plate 21 is also rotatably supported on the fixed end side of the probe 16. The first plate 21 is provided with an injection pipe 23 for filling the inside of the cylindrical sheet 18 with the liquid medium 17 and an air vent hole (not shown).

[0021] A second pulley 32 is coaxially provided on the second plate 22 on the surface opposite to the surface to which the cylindrical sheet 18 is connected. The second pulley 32 is rotatably supported by the frame 25 via the bearing 12. As a result, the second plate 22 is also rotatably supported by the frame 25.

[0022] A rotating shaft 37 passes through the rolling element 35 along its axis of rotational symmetry. Both ends of the rotating shaft 37 are connected to the frame 25 via bearings 38 (38a, 38b) to rotatably support the rolling element 35. Furthermore, the rotating shaft 37 passes through the axes of rotational symmetry of the third pulley 33 connected to the first pulley 31 via a rotation transmission member 36a and the fourth pulley 34 connected to the second pulley 32 via a rotation transmission member 36b.

[0023] As a result, when the rolling element 35 undergoes translational motion, the rolling element 35 undergoes rotational motion due to frictional transmission from the contacting surface of the specimen 51. As a result, the rotational motion of the rolling element 35 is transmitted to the first pulley 31 and the second pulley 32 via the rotation transmission members 36 (36a, 36b).

[0024] As a result, the first pulley 31, the second pulley 32 and the cylindrical sheet 18 rotate in synchronization with the rolling body 35, and the side peripheral surface of the cylindrical sheet 18 rolls on the surface of the specimen 51 without slipping. Although a timing belt is exemplified as the rotation transmission member 36, a gear can also be used. In this way, the cylindrical sheet 18 moves in a translational manner while rotating on the surface of the specimen 51, so that no shear stress or frictional force is applied to the cylindrical sheet 18, and deterioration of the cylindrical sheet 18 is less likely to progress, allowing a stable flaw detection test to be performed.

[0025] Furthermore, the ultrasonic flaw detector 10 is equipped with an encoder 41 that measures the amount of rotation of the rolling element 35 and derives the amount of movement of the frame 25. A pulley 42 provided on the rotation shaft of this encoder 41 is connected to a pulley 43 provided on the rotation shaft 37 of the rolling element 35, and rotates according to the amount of movement due to the translational motion of the rolling element 35. This makes it possible to derive the amount of rotation of the rolling element 35 from the amount of rotation measured by the encoder 41, and further derive the amount of movement of the frame 25.

[0026] In the ultrasonic flaw detector 10A of the first embodiment, an operator holds the handle 26 provided on the frame 25 and translates the ultrasonic flaw detector 10A on the surface of the test object 51. As a result, the rolling body 35 rolls while contacting the surface of the test object 51. Then, the cylindrical sheet 18 also rolls while contacting the rolling body 35. At this time, the side peripheral surface of the cylindrical sheet 18 elastically deforms so as to adhere closely to the curved or uneven surface of the test object 51. As a result, the ultrasonic waves generated from the vibration element 15 are incident on the test object 51 without passing through an air layer after propagating through the liquid medium 17. This allows the ultrasonic waves to reach the defect 53 in the test object 51 with little attenuation.

[0027] Incidentally, the structure of the frame 25 is exemplified as a rectangular frame having a top plate in plan view, but there is no particular limitation on the shape of the frame 25, and any shape that can support the rotating shaft 37 of the rolling element 35 and both ends of the cylindrical sheet 18 on both sides can be used as appropriate.

[0028] As a modified example of the embodiment, a configuration in which the rolling elements 35 are omitted is also conceivable. In this case, the cylindrical sheet 18 rotatably supported on the frame 25 rotates by friction transmission when it comes into contact with the subject 51 and moves in translation. Furthermore, a configuration in which the first plate 21 and the second plate 22 are fixed to the frame 25 without rotating is also conceivable. In this case, the cylindrical sheet 18 fixed to the frame 25 slides when it comes into contact with the subject 51 and moves in translation.

[0029] Second embodiment Next, a second embodiment of the present invention will be described with reference to Figs. 3 to 6. Fig. 3 is a perspective view of an ultrasonic flaw detection device 10B according to the second embodiment as seen from the side. Fig. 4 is an AA cross-sectional view of the ultrasonic flaw detection device 10B (Fig. 3). Fig. 5 is a BB cross-sectional view of the ultrasonic flaw detection device 10B (Fig. 3). Fig. 6 is a CC cross-sectional view of the ultrasonic flaw detection device 10B (Fig. 3). Fig. 7(A) is a DD cross-sectional view of the ultrasonic flaw detection device 10B (Fig. 3), and Fig. 7(B) is a DD cross-sectional view of the ultrasonic flaw detection device 10B according to a modified example of the second embodiment. In Figs. 3 to 7, parts having the same configuration or function as Figs. 1 and 2 are indicated by the same reference numerals, and duplicated explanations will be omitted.

[0030] The test object 51 to be tested by the ultrasonic flaw detector 10B of the second embodiment has a continuous side surface that protrudes in a convex shape, such as the head of a railroad rail shown as an example. With the passage of time, the surface of the head of a railroad rail that contacts the wheels of the railroad rail on which heavy vehicles run intermittently wears out, and cracks grow inside the head, which may cause damage. For this reason, there is a demand for the commercialization of an ultrasonic flaw detector 10B that can easily, highly accurately, and efficiently perform flaw detection evaluation over a wide range.

[0031] 3, in the ultrasonic flaw detector 10B, the outer diameter of the first plate 21 is formed to be larger than the outer diameter of the second plate 22. This allows the tubular sheet 18 to be inserted in a parallel direction into the head side surface of the test object 51 (railroad rail) with which the outer circumferential surface of the tubular sheet 18 comes into contact. The outer circumferential surface of the tubular sheet 18 can be brought into close contact with the curved surfaces at both ends of the head side surface of the test object 51 (railroad rail) that protrude laterally.

[0032] In addition, since the cylindrical sheet 18 has a cylindrical shape with the same outer diameter at both ends in a natural state without load, the outer diameter of the small-diameter second plate 22 is adjusted to the outer diameter of the cylindrical sheet 18 in this natural state. The second plate 22 sandwiches the edge of the cylindrical sheet 18 between the inner peripheral surface of the side wall 27 and the outer peripheral surface of the ring body 28, thereby connecting the cylindrical sheet 18 watertight. The large-diameter first plate 21 pushes open the opening of the cylindrical sheet 18 and covers the outer peripheral surface of the side wall 27. The outer periphery of the edge of the cylindrical sheet 18 covering the outer peripheral surface of the side wall 27 is then fastened with a band 39, thereby connecting the first plate 21 and the cylindrical sheet 18 watertight.

[0033] Furthermore, as shown in Fig. 4, a pair of cylindrical sheets 18 (18a, 18b) are arranged in a position in which they contact both side surfaces of the test object 51 and sandwich the test object 51. Similarly, as shown in Fig. 5, rolling elements 35 (35a, 35b) corresponding to each cylindrical sheet 18 (18a, 18b) are arranged in a position in which they contact both side surfaces of the test object 51 and sandwich the test object 51. Furthermore, as shown in Fig. 6, the ultrasonic flaw detection device 10B includes support wheels 52 that abut against the upper side surface of the test object 51 and support the weight of the probe 16, the cylindrical sheets 18, and other structures.

[0034] Returning to Fig. 3, the explanation will be continued. In the second embodiment, each of the frames 25 (25a, 25b) that support the cylindrical sheet 18, the rolling elements 35, etc. is connected to a base body 55 via a support member 56 (56a, 56b). The base body 55 is provided with a handle (not shown) for an operator to push it by hand, and moves over the upper surface of the subject 51 while rotating the support wheels 52.

[0035] In addition, although the support members 56 (56a, 56b) are shown in a simplified manner, they have a mechanism for adjusting the position of the frames 25 (25a, 25b) relative to the base body 55 and for adjusting the distance between the frames 25, and further have an adjustment mechanism for setting the frames 25 (25a, 25b) from above the subject 51.

[0036] The description will be continued with reference to Fig. 4. In the second embodiment, a transducer element 15a dedicated to ultrasonic transmission is mounted on one frame 25a, and a transducer element 15b dedicated to ultrasonic reception is mounted on the other frame 25b. In this way, a transmission method is adopted in which ultrasonic waves transmitted by a transducer element 15a placed on one side of an object 51 are received by a transducer element 15a placed on the opposite side. According to this transmission method, the strength of the transmitted ultrasonic waves changes depending on a defect 53 present inside the object 51, so that the presence of the defect 53 can be detected. The above-mentioned echo detection method can also be adopted in the second embodiment.

[0037] In the second embodiment, as shown in FIG. 7(A), the cylindrical sheets 18 (18a, 18b) and the rolling elements 35 (35a, 35b) are arranged in positions facing each other when the subject 51 is viewed from above. On the other hand, as a modified example, they may be arranged in a crossing position as shown in FIG. 7(B), or may be arranged in a position shifted along the longitudinal direction of the subject 51. As shown in FIG. 7(B), the angle of each probe 16 is adjusted so that the openings of the vibration elements 15a and 15b are perpendicular to the propagation path of the ultrasonic waves.

[0038] In the second embodiment, a railway rail is used as the test object 51, but this is merely an example, and other objects can also be used as the test object 51. Furthermore, a configuration in which a pair of frames 25 (25a, 25b) are connected to a base body 55 equipped with support wheels 52 so as to sandwich both sides of the test object 51 is exemplified, but a configuration in which one frame 25 is connected to the base body 55 on only one side of the test object 51 is also possible.

[0039] Third embodiment Next, a third embodiment of the present invention will be described with reference to Fig. 8 and Fig. 9. Fig. 8(A) is a perspective view of an ultrasonic flaw detection device 10C according to the third embodiment as seen from the side. Fig. 8(B) is a view in which the frame 25 is displaced upward in the third embodiment. Fig. 9 is a view in which the frame 25 is rotated and displaced in the third embodiment. In Fig. 8 and Fig. 9, parts having the same configuration or function as Fig. 3 to Fig. 7 are indicated by the same reference numerals, and duplicated explanations will be omitted.

[0040] 8, a frame 25c in an ultrasonic flaw detector 10C of the third embodiment is rotatably supported by a support member 56c (56) via a rotation shaft 57. The rotation shaft 57 is provided along the traveling direction of the support wheel 52. The support member 56c is fixed to a base body 55 via a height adjustment member 60.

[0041] The height adjustment member 60 is composed of a guide member 61 that limits the relative displacement between the support member 56c and the base body 55 only in the vertical direction, a screw member 62 that screws into a part of the support member 56c and is rotatably held on a part of the base body 55, and an operating means 63 that rotates the screw member 62 to set the distance between the support member 56c and the base body 55. By operating the operating means 63, as shown in Figures 8(A) and (B), the height position of the support member 56c fixed to the base body 55 can be adjusted, and the position of the subject 51 through which the ultrasonic waves transmitted and received by the probe 16 propagate can be changed.

[0042] 9, when wear is progressing on one side of the test object 51, the frame 25c can be tilted about the rotation axis 57 to optimize the contact state of the rolling element 35 with the test object 51 and the incidence direction of the ultrasonic waves. Although not shown, with the frame 25c tilted in this way, the longitudinal position of the probe 16 can be further adjusted to optimize the incidence position of the ultrasonic waves.

[0043] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Fig. 10. Fig. 10 is a side perspective view of an ultrasonic flaw detection device 10D according to the fourth embodiment. In Fig. 10, parts having the same configuration or function as Fig. 3 to Fig. 9 are indicated by the same reference numerals, and duplicated explanations will be omitted.

[0044] The ultrasonic flaw detection apparatus 10D of the fourth embodiment further includes, in addition to the configuration of the third embodiment, a mounting portion 72 for mounting at least a tank 71 for containing water to be supplied to the contact position between the outer peripheral surface of the tubular sheet 18 and the specimen 51, a platform wheel 65 for abutting the upper surface of the specimen 51 and supporting the weight of the mounting portion 72, and an abutting member 66 for abutting the peripheral end portion 58 of the base body 55 and moving the base body 55 in accordance with the movement of the mounting portion 72.

[0045] The tank 71 is connected by a hose (not shown) to a water supply nozzle 67 provided on the base body 55. Water supplied through the hose is sprayed from the tip of the water supply nozzle 67, wetting the interface where the outer circumferential surface of the cylindrical sheet 18 comes into contact with the test object 51. This reduces the acoustic impedance at the interface, suppresses reflection at the interface, and allows ultrasonic waves to be efficiently incident on the test object 51.

[0046] In addition to the tank 71, the mounting part 72 is equipped with a signal processing part 75 for processing signals transmitted to and received from the ultrasonic transducer elements 15, a monitor 76 for visualizing and displaying the processed signals, etc. The gravitational object placed on the mounting part 72 is supported on the upper side of the subject 51 via the platform wheels 65 which rotate by friction in contact with the object.

[0047] The mounting part 72 is further provided with a handle 77, and when the examiner pushes this handle 77 in the horizontal direction, the platform wheels 65 rotate, and the mounting part 72 moves translationally along the subject 51. Then, the abutment member 66 connected to the mounting part 72 abuts against the peripheral end 58 of the base body 55, frictionally rotating the support wheels 52 directly or indirectly connected to the mounting part 72. As a result, the mounting part 72 is moved by pushing the handle 77, and the ultrasonic transducer 15 supported by the base body 55 can be moved along the subject 51 accordingly.

[0048] According to at least one embodiment of the ultrasonic flaw detection device described above, by having a cylindrical sheet that holds a liquid medium inside while accommodating a probe with an array of vibration elements, it becomes possible to inspect specimens having curved or uneven surfaces with high precision.

[0049] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents described in the claims, as well as in the scope and spirit of the invention. [Explanation of symbols]

[0050] 10 (10A, 10B)... ultrasonic flaw detector, 11... bearing, 12... bearing, 15 (15a, 15b)... vibration element, 16... probe, 17... liquid medium, 18... cylindrical sheet, 21... first plate, 22... second plate, 23... injection tube, 25 (25a, 25b, 25c)... frame, 26... handle, 27... side wall, 28... ring body, 29... sealing member, 31... first pulley, 32... second pulley, 33... third pulley, 34... fourth pulley, 35... rolling body, 36 (36a, 36b)... rotation transmission member , 37...rotating shaft, 38 (38a, 38b)...bearing, 39...band, 41...encoder, 42...pulley, 43...pulley, 51...test object, 52...support wheel, 53...defect, 55...base body, 56 (56a, 56b, 56c)...support member, 57...rotating shaft, 58...periphery, 60...height adjustment member, 61...guide member, 62...screw member, 63...operation means, 65...base wheel, 66...contact member, 67...water supply nozzle, 71...tank, 72...support portion, 75...signal processing unit, 76...monitor, 77...handle.

Claims

1. A probe in which ultrasonic vibration elements are arranged in a longitudinal direction; a cylindrical sheet that holds the probe and a liquid medium therein and whose outer circumferential surface is in contact with the subject; a frame to which one end of the probe is fixed; a first plate that is rotatably supported by the probe on the side of the fixed end of the frame and to which one end of the cylindrical sheet is fixed; a second plate that is rotatably supported by the frame at a position opposite to the first plate and to which the other end of the cylindrical sheet is fixed; a first pulley provided coaxially with the first plate; A second pulley provided coaxially with the second plate; a rolling element that is rotatably supported on the frame, that comes into contact with the subject, and that rotates by friction transmission when it moves in a translational manner; a rotation transmission member that transmits the rotational motion of the rolling body to the first pulley and the second pulley.

2. The ultrasonic flaw detector according to claim 1, An ultrasonic flaw detection apparatus in which the outer diameter of the first plate is larger than the outer diameter of the second plate.

3. The ultrasonic flaw detector according to claim 1 or 2, An ultrasonic flaw detection device in which a pair of the cylindrical sheets are placed in a position to contact both sides of the test object and sandwich the test object.

4. The ultrasonic flaw detector according to claim 3, An ultrasonic flaw detection device comprising support wheels that abut against an upper surface of the test object and support the weight of at least the probe and the cylindrical sheet.

5. The ultrasonic flaw detector according to claim 4, An ultrasonic flaw detection device comprising a support member fixed to a base body on which the support wheels are provided and supporting the frame so as to be rotatable about an axis along the traveling direction of the support wheels.

6. The ultrasonic flaw detector according to claim 5, An ultrasonic flaw detection device comprising a height adjustment member for adjusting the height position of the support member fixed to the base body.

7. The ultrasonic flaw detector according to claim 5 or 6, a placement section for placing at least a tank for containing water to be supplied to a contact position between an outer circumferential surface of a cylindrical sheet and the subject; a platform wheel that abuts against an upper surface of the subject and supports the weight of the placement unit; an abutment member that abuts against a peripheral end of the base body and moves the base body in association with the movement of the placement portion.

8. The ultrasonic flaw detector according to any one of claims 1 to 7, An ultrasonic flaw detector comprising an encoder that measures the amount of rotation of the rolling element and determines the amount of movement of the frame.

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