JPH068807B2 - Ultrasonic probe holder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ultrasonic probe holder, and more specifically, to a tubular subject using a pair of transmitting probe and receiving probe. The present invention relates to a probe holder used for flaw detection.

[Prior Art] As a method of detecting a defect occurring in a pipe, for example, a creep crack occurring in a reaction pipe of an ammonia production apparatus, a hydrogen production apparatus, etc. There is an ultrasonic flaw detection method in which ultrasonic probes are arranged apart from each other, ultrasonic waves are allowed to pass through a thick portion of the tube, and the presence or absence of cracks and the degree thereof are detected depending on the degree of the passing. 9th
The figure shows an ultrasonic probe holder for integrally holding a transmitting probe and a receiving probe when performing the ultrasonic flaw detection method. Both the transmitting probe A and the receiving probe A'are mounted on the probe housing blocks B and B ', and the bottom surfaces b and b'of the blocks B and B'are along the outer peripheral surface of the pipe. It is curved. These blocks B and B'are rotatably and fixably attached to the pair of arm members C and C'via set screws D and D '. The pair of arm members C and C ′ are swingably connected to each other via a pin E. When the transmitting probe A and the receiving probe A ′ are arranged as shown in the figure, the ultrasonic wave transmitted from the transmitting probe A stays in the opening W of the probe block B. The water which is the contact medium moves in the direction indicated by the arrow O, and then the thick portion of the pipe F advances in the direction indicated by the arrow P, and then the water accumulated in the opening W'of the probe block B'indicates the arrow Q. The process proceeds as shown by to reach the receiving probe A ′. By doing so, flaw detection is performed on the ultrasonic wave passing range G in the thick portion of the pipe F.

In the above ultrasonic probe holder, when changing the distance between the transmitting probe A and the receiving probe A ′, that is, the central angle, first loosen the screws D and D ′ and then the outer circumference of the pipe. The probe blocks B,
B'is moved together with the probes A and A '. Both transducers A,
The screw D, D'when A'occupies an arbitrary position
Installation of the probes A and A'is completed by tightening.

[Problems to be Solved by the Invention] By the way, when it is desired to change the incident angle of ultrasonic waves to the thick portion of the pipe due to the thickness or outer diameter of the pipe, the probe A , A ′ with the receiving blocks B, B ′ at an arbitrary angle with respect to the surface of the pipe, and then set screws D,
Tighten D'to the arm members C, C'to the block B,
It suffices to fix B ′, but at this time, as described above, the pair of arm members C and C ′ are only swingably connected to each other by the pin E, and the storage blocks B and B. Since'is inclined with respect to the tube surface, it is difficult to hold the probes A and A'at arbitrary positions.
Further, when the accommodation blocks B and B ′ are tilted with respect to the tube surface, the openings W of the accommodation blocks B and B ′ are formed through the gaps formed between the bottom surfaces b and b ′ of the accommodation blocks B and B ′ and the tube surface.
The contact medium staying in W ′ flows out, and ultrasonic flaw detection becomes impossible.

[Means for Solving the Problems] In view of the above circumstances, the present invention engages a pair of transmitting and receiving probes with a guide member so as to be linearly movable, and the pair of guide members. And a positioning means for holding the probe at an arbitrary position with respect to the guide member, and a holder main body that is swingably arranged on the holder main body that is positioned on the peripheral surface of the tubular subject. Positioning means for holding the guide member at an arbitrary position is provided, and a seal member surrounding at least the probe surfaces of the pair of probes is provided.

[Operation] According to the ultrasonic probe holder having the above configuration, the probe can be accurately fixed and held at an arbitrary position by using the holder body positioned on the peripheral surface of the tubular subject as a reference. it can. Further, even if the probe is arranged to be tilted with respect to the surface of the tubular subject, the contact medium always stays between the bottom surface of the probe and the surface of the tubular subject due to the sealing member.

[Embodiment] Hereinafter, a specific configuration of the present invention will be described in detail with reference to the drawings illustrating an embodiment.

1 to 8 show an example in which the ultrasonic probe holder 1 according to the present invention is used as a probe holder in an apparatus for continuously flaw-detecting a pipe over its entire circumference. . The holder 1 includes a holder body 10 and a probe guide member 5
The holder main body 10 has two side walls 11 and 12 facing each other, and a support column 13 connecting the side walls 11 and 12 to each other. The lower edges 11a and 12a of the side walls 11 and 12 that face the surface of the tube 200 (see FIGS. 1 and 4) as a subject are curved so as to extend along the peripheral surface 201 of the tube 200. Further, rollers 14, 14, 15, 15 are rotatably supported at the left and right ends of the side walls 11, 12, respectively.
Reference numerals 15 and 15 denote lower edge portions 11a and 1 of the side walls 11 and 12, respectively.
It is arranged so that a part thereof projects from 2a.
Further, the side wall 11 is formed with a couplant supply channel 17 which extends from a couplant supply port 16 provided at substantially the center of the side wall 11 and opens to the lower edge 11a. On the other hand, as described above, the probe guide member 50 is attached to the holder body 10.
Is provided. The probe guide member 50 includes guide side plates 51 and 52 facing each other, a bottom plate 53, etc., and the space defined by the guide side plates 51, 52 and the bottom plate 53 is used for transmission. The probe 300 is slidably fitted. Glycerin is interposed as a contact medium between the probe surface 301 of the probe 300 and the inner surface of the bottom plate 53. In addition, the holder body 10 is used for the flaw detection work as shown in FIG.
The probe 300 is arranged along the circumferential direction of 00.
Will be movably arranged in a direction substantially orthogonal to the axial direction of the pipe 200. A moving member 54 is fitted on the probe 300, and an adjusting screw 55 rotatably supported by the guide side plate 51 is screwed on the moving member 54. By appropriately rotating the adjusting screw 55, the probe 300 can be moved to an arbitrary position. A pointer 56 is drawn on the moving member 54, while a scale 57 is engraved on the guide side plate 52. The moving member 54, the adjusting screw 55, the pointer 56, the scale 57 and the like constitute the positioning means 500. Further, the support shaft 20 penetrates through one end of the bottom plate 53, whereby the probe guide member 50 is supported by the support shaft 2.
The holder body 10 is swingably supported about 0. On the other hand, the side wall 11 of the holder body 10 is formed with an elongated hole 18 extending in the vertical direction in the figure (see FIG. 2) and curved, and a set screw 60 is loosely fitted in the elongated hole 18. The set screw 60 is screwed to a lower end portion of the probe guide member 50 on the opposite side to the side where the support shaft 20 penetrates, and by moving the set screw 60 in the elongated hole 18, The probe guide member 50 swings around the support shaft 20. Further, the set screw 6 is provided in the slot 18.
A support needle 61 that slides in the elongated hole 18 together with 0 is arranged, while an angle scale 62 centered on the support shaft 20 is engraved on the surface of the side wall 11 of the holder body 1. The slot 18, the set screw 60, the pointer 61, and the angle scale 6
The positioning means 600 is constituted by 2. On the other hand, the holder main body 10 is provided with a probe guide member 50 that holds the above-mentioned probe 300 for transmission and a probe guide member 50 ′ that holds a probe 300 ′ for reception. ing. As is apparent from the drawings, the probe guide member 50 ′ is formed and arranged in the holder main body 10 so as to be opposed to the probe guide member 50 described above.
Therefore, regarding each element related to the probe guide member 50 ', the element having the same shape or the same operation mode as the probe guide member 50 described above is denoted by the same number as that of the probe guide member 50 described above. Number '(dash)
, And detailed description is omitted. Also, FIGS. 4 and 8
As shown in the figure, the seal member 1 is provided at the bottom of the holder body 10.
00 is provided. The seal member 100 covers the peripheries of the pair of probes 300, 300 'and the probe surfaces 301, 301' of the probes 300, 300 '.
The holder main body 10 and the probe guide members 50 and 50 'are filled so as to surround the seal member 100.
Is composed of nylon sponge. Further, as is clear from FIG. 8, a notch 101 is provided in the seal member 100 at a portion corresponding to the couplant supply path 17.

A tube 200 using the ultrasonic probe holder 1 having the above-described configuration.
The positioning operation of the probes 300 and 300 'in the case of performing the flaw detection will be described below. First, drawing and calculation are performed based on the outer diameter and the wall thickness of the pipe to be flaw-detected, and the distance between the transmitting probe 300 and the receiving probe 300 ′ and the probe surfaces 301 and 301 ′ are measured. An inclination angle with respect to the pipe peripheral surface 201 is derived. Note that the above-mentioned drawing method and calculation method are already well known, and therefore description thereof will be omitted. Next, the adjusting screw 5 in the positioning means 500, 500 '
5, 55 'are appropriately rotated to search the probes 300 and 30.
0 ′ is occupied at a predetermined position on each of the probe guide members 50 and 50 ′. At this time, by utilizing the pointer 56 and the scale 57, the distance between the probes 300 and 300 ′ can be accurately set. In addition, the above probe 300
Needless to say, and 300 'are symmetrically positioned with respect to each other at the same distance from the support shaft 20. Next, the set screws 60, 60 'in the positioning means 600, 600' are loosened, and the probe guide members 50, 50 'are moved to the probe 30.
The 0,300 ′ probe surfaces 301, 301 ′ are swung so as to have a predetermined inclination. This set screw 60, 60 '
And the probe guide members 50 and 50 ′ are fixed to the holder body 10. At this time, the pointer 61 and the angle scale 62
By using and, it is possible to accurately set the installation angles of the probes 300 and 300 ′. Also, the above probe 3
00, 300 'is a pipe peripheral surface 201 with the spindle 20 as the center.
Needless to say, they are positioned at the same inclination angle with respect to.
After the positioning of the probes 300 and 300 'with respect to the holder body 10 is completed, the ultrasonic probe holder 1 is set on the peripheral surface 201 of the tube 200 as the subject, as shown in FIG. At this time, the side walls 11 and 12 are connected to the pipe 20 as shown in the drawing.
By arranging the probes along a direction substantially orthogonal to the 0 axis, the probes 300 and 300 ′ are arranged side by side on the same circumference in the tube 200. Further, the ultrasonic probe holder 1 is attached to a probe scanning device (not shown). The apparatus includes a scanning unit that moves around the outer circumference of the subject around the axis of the tubular subject, and the ultrasonic probe holder 1 is attached to the scanning unit via a spring. The rollers 14, 14, 15, provided on the holder body 10 by the urging force of the spring,
The holder body 10 is positioned with respect to the pipe 200 by the contact of the pipe 15 with the pipe peripheral surface 201. In addition, the sealing member 100 causes the pipe circumferential surface 201 to
Pressed against. Since the nylon sponge that constitutes the sealing member 100 has sufficient flexibility, when the ultrasonic probe holder 1 is arranged along the weld overlay as shown in FIG. However, the seal member 100 is in close contact with the pipe peripheral surface 201. Next, when water as a contact medium flows into the contact medium supply port 16, this water passes through the contact medium supply port 17 and passes through the seal member 100 and the probe guide member 5.
Bottom plates 53, 53 'and tube peripheral surface 20 at 0, 50'
Retain in a space 400 (see FIGS. 4 and 8) surrounded by 1 and 1. In addition, excess water is supplied to the space 40
It is discharged from the upper opening of 0. When an ultrasonic wave is transmitted from the transmitting probe 300 in this state, the ultrasonic liquid passes through the water in the space 400, enters the pipe 200, is reflected by the inner peripheral surface of the pipe, and then is again reflected in the space 400. It passes through the water inside and is received by the receiving probe 300 '. Thus, a part of the circumference of the pipe 200 is inspected. As described above, by reflecting the ultrasonic waves on the inner peripheral surface of the pipe 200, not only the thick portion of the pipe 200 but also the crack generated on the inner peripheral surface of the pipe 200 can be reliably detected. Therefore, particularly useful test results can be obtained in a reaction tube or the like. Further, by performing the flaw detection operation while moving the ultrasonic probe holder 1 in the circumferential direction of the tube 200 by the above-described scanning device, flaw detection can be continuously performed over the entire circumference of the tube 200.

In this example, an example in which the present invention is applied to an ultrasonic probe holder of an apparatus for continuously flaw-detecting the entire circumference of a pipe is shown. It is possible to apply the present invention to an ultrasonic probe holder for performing. In addition, positioning of the probe with respect to the probe guide member and positioning of the probe guide member with respect to the holder body
Although each is performed by the positioning means using screws, the engagement of the probe guide member with the probe and the support of the probe guide member by the holder main body are tightened to eliminate the screws and the like. Is also possible.

[Effects of the Invention] As described in detail above, according to the ultrasonic probe holder of the present invention, the pair of probes are positioned with reference to the holder body positioned on the tubular subject. Therefore, it is possible to accurately and surely place the probe on the tubular subject. In addition, since the contact medium is always retained between the probe bottom surface and the tubular subject surface by the seal member, it is possible to appropriately set the installation angle of the probe with respect to the tubular subject. became. Also, a notch is provided in the upper portion of the seal member, and the contact medium that has accumulated between the probe bottom surface and the tubular subject surface overflows upward through the notch to generate in water. Since it is configured to positively remove the generated bubbles to the outside, it is possible to prevent a decrease in flaw detection sensitivity due to the bubbles in the contact medium. Further, this makes it possible to easily detect a flaw on a tubular specimen having various outer diameters with one ultrasonic probe holder.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a usage mode of an ultrasonic probe holder according to the present invention, FIG. 2 is a side view showing a seal member omitted, and FIG. FIG. 4 is a sectional side view showing the state of the mounting portion of the seal member, FIG. 5 is an end view without the seal member, and FIGS. 6 and 7 show the seal member. 9A and 9B are a top view and a bottom view that are omitted, and FIG. 8 is a bottom view of the ultrasonic probe holder showing the shape of the seal member, and FIG. It is the side view which showed. 1 ... Ultrasonic probe holder, 10 ... Holder body, 11, 1
2 ... Side wall, 14, 15 ... Roller, 17 ... Catalyst medium supply passage, 18, 18 '... Oblong hole, 20 ... Spindle, 50, 50' ...
Probe guide member, 51, 51 ', 52, 52' ... Guide side plate, 54, 54 '... Moving member, 54, 55' ... Adjusting screw, 56, 56 '... Pointer, 57, 57' ... Scale, 60 ，
60 '... Set screw, 61, 61' ... Pointer, 62, 62 '
... angle scale, 100 ... sealing member, 101 ... notch,
300, 300 '... Probe, 500, 500' ... Positioning means, 600, 600 '... Positioning means.

Claims (1)

[Claims] 1. A pair of probes are arranged on a peripheral surface of a tubular subject, and an ultrasonic wave transmitted from one probe passes through a thick portion of the tubular subject and then the other probe. In the ultrasonic probe holder that holds the pair of probes to be received by the probe, the pair of probe guide members are respectively rocked on the holder body positioned on the peripheral surface of the tubular subject. Positioning means for movably arranging the pair of probe guide members to hold the pair of probe guide members at arbitrary swing positions are provided, and the probes are respectively attached to the pair of probe guide members with the tubular cover. A seal that is arranged so as to be movable in the direction orthogonal to the axis of the sample and that is provided with positioning means that holds the pair of probes at arbitrary positions, and that further surrounds at least the probe surfaces of the pair of probes. A member is provided, and the pair of members is formed by the seal member. While retaining the contact medium between the probe and the tubular subject, through the notch provided in the upper portion of the seal member, it stayed between the pair of probes and the tubular subject. An ultrasonic probe holder characterized in that the contact medium is made to overflow.