JP2971277B2 - Ultrasonic probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, in the interior of the various industrial products
The present invention relates to an ultrasonic probe applied to an ultrasonic inspection test for detecting a generated defect or the like .

[0002]

2. Description of the Related Art A conventional tire-type ultrasonic probe is shown in FIG.
As shown in FIG. 4, Ru Tei rubber tire 11 rotating is provided around the stationary shaft 16. Further, a vibrator 13 attached in one direction to the fixed shaft 16 is provided inside the rubber tire 11.
With placing the liquid medium on the outer periphery of the vibrator 13 1
2 that it has been filled. Then , the rubber tire 11 is caused to run through the liquid medium 12 and the rubber tire 11.
To propagate ultrasound from the transducer 13 in the test body 10 which is in, which was so as to detect in which defects (flaws) 15 occurs during the test body 10, deletion which occurred during rolling the steel sheet
It is used like the automatic ultrasonic testing for detecting Recessed 15. Therefore, in such a tire-type ultrasonic probe, a defect 15 generated in the specimen 10 is formed on the surface of the specimen 10.
The same effect as detecting the defect 15 by directly contacting and moving the probe that can be detected is obtained.

[0003]

THE INVENTION Problems to be Solved However, the above-mentioned
In the conventional tire type ultrasonic probe, structurally, the vibrator 1
Between the fixed shaft 16 to which the tire 3 is fixed and the rubber tire 11
The body medium 12 is filled and the liquid medium 12
Since the ear 11 is supported, the fixed shaft 16
The rubber tire 11 rotates around the surface of the test piece 10
The rotating rubber tire 11 has its own rigidity and the shape of the rotating body.
And the rigidity of the rubber tire 11
When scanning in a direction other than the rotation direction when is low, for example,
When performing spiral scanning, the rubber tire 11 is twisted.
And a good contact state with the surface of the test piece 10 cannot be maintained.
Therefore, it is spirally continuous on the cylindrical surface such as the inner surface of the pipe.
Scanning is difficult, flaw detection accuracy deteriorates,
Inspection speed may be low. Therefore, the rubber tire 1
1 to secure the rigidity and eliminate such problems
Needs to be a thick rubber tire 11
Compared to the diameter of the vibrator for performing wounds (approximately 20 mm), 50 to 200 mm and rather large outer diameter of the rubber tire 11
There is a need to. For this, as in such inner surface flaw detection and the rotor center hole inspection of small diameter pipes, when used in a narrow space, in these tires ultrasonic probe, the outer diameter is too large applied The problem that many cases cannot be done
there were.

In such a case, conventionally , as shown in FIGS. 5 and 6 , the direct contact probe 17 is placed on the surface of the test piece 10.
As is the flaw detection by scanning and to perform the implementation, the testing of these direct contact probe 17, when was <br/> the fast scan, providing a direct contact probe 17 extension of couplant 18 interposed can not follow the scanning of direct contact probe 17 between the sheet <br/>-menu 19 and the specimen 10 was contact
Do <br/> stability of the reflected wave is evil castings for deformation of the medium 18 is, not good inspection results are obtained, furthermore, the test body 10
If the table surface is a curved surface of the specimen 10 for each time testing
There is a problem that requires a shoe 19 in accordance with the curvature of
Was.

Further , the direct contact probe 17 is connected to the test piece 10.
The outer diameter is relatively large so that flaw detection can be performed by scanning on the surface of
Flaw detection is also possible with a tire-type ultrasonic probe
A place where flaw detection of a test piece 10 having a large outer diameter that can be performed
In order to ensure the rigidity of the rubber tire 11,
, The need to rubber tire 11 thick, ultrasonic attenuation by rubber tire 11 becomes significant, the defect detectability was inconveniently reduced.

[0006]

Means for Solving the Problems The present invention, conventional described above
To solve the problem that the generated ultrasonic probe, take the following means.

That is, as an ultrasonic probe, a large-diameter outside
The liquid medium introduced from one end of the probe case around
An oil storage section is provided to store all oil, and the shaft center is made of solid material.
The central part and the central part are arranged with steps at both ends.
A small-diameter roller type with a small- diameter solid part
And a solid medium provided on one side in the circumferential direction inside the solid at the center.
Probe case with vibrator placed at the center and oil reservoir at the center
In addition to covering the outer circumference, the outer circumference and the center of the middle
And cover the outer end surface with a step with clearance
A thin rubber tire is in flanged cylindrical having a flange, is inserted into the shaft portion formed integrally at both ends of the solid portion of the probe casing, outside side surface of the middle portion shaft portion protrudes With
A bearing bearing with a clearance provided between it and the outer peripheral part of the intermediate part and the clearance of the outer end face and
Clearer between the outer surface of the intermediate part and the bearing
To prevent oil leakage from the oil storage section
And thin rubber tires in the center and middle
Sealing means for rotating around the outer peripheral surface is provided .

[0008]

As a result, in the ultrasonic probe of the present invention,
A large diameter center part and a step are provided at both ends of the center part on the surface
Small diameter roller type with a small diameter intermediate part
Provided on one side in the circumferential direction inside the solid in the probe case
At the outer periphery of the central part where the vibrator is arranged on the solid medium
The solid oil is stored in the oil storage section from one end of the probe case.
Oil is introduced through an oil pipe drilled inside the medium and stored and filled
The oil pipe and close it to form an oil layer around the center
You . Next, the probe is placed inside the oil reservoir at the center of the probe case.
To be placed inside one of the solids in the circumferential direction.
In addition , the vibrator arranged on the solid medium is
So as to cover the outer periphery of the oil storage section.
Contact the outer peripheral surface of the thin rubber tire
While transmitting ultrasonic waves from the transducer,
Scans the inside of the specimen by receiving ultrasonic waves reflected from the
U.

As a result, the specimen in the probe case comes into contact with the specimen.
The oil reservoir filled with oil on the outer periphery of the central part
By coating with ear,
Section was filled into an oil reservoir provided on the outer surface of the solid
Supported by solids including oil and solid media as liquid media
And it is not necessary to increase the rigidity.
The outer diameter of a thin rubber tire can be reduced, and the diameter can be reduced.
It can be inserted into a narrow space such as a pipe,
In addition to being able to detect flaws in a small space, the ultrasonic waves from the transducer are transmitted outside the solid medium where the transducer is installed and the probe case.
Oil reservoir oil filled in the peripheral, Ri Tsutawa the specimen sequentially through the thin rubber tires and test <br/> body, also, the oil in the oil reservoir
Due to fluidity, the outer surface of the probe case and the specimen during scanning
The contact of the specimen becomes good, so that the ultrasonic wave for scanning is less attenuated, and a defect in the test object with high sensitivity can be detected.

[0010] In addition, thin-walled rubber tires have a cylindrical shape with a collar.
To cover the oil reservoir provided on the outer periphery at the center.
With clearance on the outer periphery and the outer end face of the middle part
So that oil is stored over the entire length of the central part.
Part can be formed on the outer peripheral part, when scanning due to the fluidity of oil
When the contact with the specimen of probe case becomes better bets
In addition, the clips provided on the outer peripheral portion and the outer end surface of the intermediate portion
Shafts integrally formed at both ends of the rear lance and the middle part
Clear between bearings inserted into each part
Provide lances and seal these clearances.
Because it is inserted and provided, the probe case during scanning
To prevent oil leakage from the oil reservoir to improve contact with
Stop, and attach the thin rubber tire to the center and middle
It can be rotated by the part. In addition, oil storage
The inside of the retainer is made of solid including a solid medium for fixing the vibrator , and the bearing
Continuous scanning of the probe case, especially spiral scanning
As a result, automatic high-speed flaw detection becomes possible and inspection time is greatly reduced
Can be shortened. Scan the probe case.
When moving between specimens,
The source moves in the set position without rotating, and
Because the meat rubber tires follow the rotation, the test piece with good sensitivity
Flaw detection.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the ultrasonic probe according to the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view, and FIG. 2 is a transverse sectional view.

The probe case 02 has a large-diameter central portion 02a.
Intermediate portion 02 having a small diameter by providing a step with the central portion 02a
is the small diameter roller type ing from and b (diameter of about 30 mm), especially
In the circumferential direction of the central portion 02a, a vibrator 1
0 place the acrylic resin solid medium to place
To form the inside with a solid. This search
The length of the middle part 02b is the center part 02a.
It is formed shorter than that . Further, the inside of the solid medium in the central portion 02a of the probe case 02, incorporated vibrator 01 is embedded in the direction of <br/> emit ultrasonic waves in the radial direction Rutotomo
Then, an ultrasonic wave reflected from the inside of the test specimen 10 described later is received.
Shin receiving apparatus that provided. In addition, as the vibrator 01, a split type having a frequency of 5 MHz capable of performing high-sensitivity flaw detection of the defect 15 generated inside the test body 10 was used. In particular, an acrylic resin 013 is provided in front of the vibrator 10.
Solid medium consisting of is filled, the outer surface shape, cross-sectional shape
The shape is trapezoidal . The lead wire of the vibrator 01 is a shaft
Parts and passed through a probe casing 0 2 of the axis, it is coupled to probe cable 08 probe at another end <br/> face of the shaft portion. Also, the shaft
An intermediate portion 02b from a end surface portion, <br/> oil pipe 09 along the axis of the central portion 02 is inserted, its tip that are opened to the outer side surface of the central portion 02.

Outer peripheral surface of central part 02a of probe case 02
The step formed from the outer periphery of the oil storage portion 012 of the clearance a formed at the outer peripheral surface of the intermediate portion 02b and the central portion 02 is formed.
So as to cover the made the outer end face e at a predetermined clearance b
A thin-walled rubber tire 06 made of butadiene rubber and having a flange is provided.

At this time, the outer diameter of the thin rubber tire 06 is
The same as the outer diameter of the outer ring 3a of the bearing 03 described
Slightly small and provided at both ends of thin rubber tire 06
The outer end face of the flange 06a to be is formed to be in the prolongation on the outer side surface d of the middle portion 02b of the probe case 02.

A bearing 03 having a ball bearing 05 is inserted into a shaft portion formed integrally with both ends of the intermediate portion 02b of the probe case 02 and having a smaller diameter than the intermediate portion 02. . And with a predetermined clearance c between the outer side surface d of the intermediate portion 02b is provided, it is set <br/> bets are disposed side. The outer end face of the intermediate portion 02 where the step is formed; and
Outer peripheral surface of intermediate portion 02 and brim 06a of thin rubber tire 06
Clearance b formed between the inner surface and the ball
Side face and flange 06a hanging part and middle of the ringing bearing 03
The clearance c is formed between the outer surface of the parts, water
Teflon or metal seal plates 07a and 07b are provided for dense and rotational force transmission. The small diameter side diameter of the seal plate 07a is slightly larger than the outer diameter of the intermediate portion 02b of the bearing 03 insertion portion, and the side surface of the ball bearing bearing 03.
Step the contact portion is provided with a large diameter side diameter of the seal plate 07a is slightly smaller than the outer diameter of the outer ring 03a of the bearing the bearing 03. This ball bearing bearing 03 side
Step range of the seal plate 07a provided on the contact portion with the face, Bo
Different depending on the shape of Lumpur bearing bearing 05. The outer circumference of the intermediate portion 02b of the sealing plate 07b is probe case 02
It is provided so as to be in close contact with the surface and an outer end surface forming a step from the central portion 02a.

In the above, the oil (liquid medium) 012 is injected from the oil pipe 09, the outer peripheral surface of the central portion 02a is provided with a clearance a, and the oil reservoir covered with the thin rubber tire 06 is provided.
The filling part 012 is filled. And, from one end of the shaft,
Plug the end of the oil pipe 09 protruding into the part
As a result, the oil reservoir 012 is provided with a liquid medium having a constant pressure.
Oil is retained.

Thereafter, the outer end of the probe case 02 is attached to a scanning jig, and the thin rubber tire 06 on the vibrator 01 side is brought into contact with the surface of the test piece 10 as shown in FIG. Then , an ultrasonic wave is emitted from the transducer 01 and is generated in the test body 10.
Detecting the in which defect 15 and. When the probe case 02 moves, the thin rubber tire 06 and the seal plates 07a and 07b rotate following the rotation of the outer ring 03a of the ball bearing 03 while the transducer 01 faces in the same direction. . What
Note that the seal plate 07b is used to rotate the ball bearing 03.
It is not necessary to follow the rolling, but lubricating oil (liquid medium)
Following the brim 06a of the thin rubber tire 06
Will rotate.

As described above, the ultrasonic probe of this embodiment is
It has the following features . (1) Since the outer surface of the thin rubber tire 06 pressurized with the liquid medium closely follows the surface of the test piece 10, a constant contact state can be always maintained even at high speed rotation. (2) between the thin rubber tires 06 and the vibrator 01, Aku
Because there are solid media such as rill resin and liquid media such as oil ,
Thin rubber tire 06 is not the propagation of the ultrasonic wave is hindered be rotated. (3) Since the probe casing 02 is composed of a fixed medium, the use of thin-walled rubber tire 06, the rigidity of the entire probe is extremely rather large, the thickness of the thin rubber tire 06
There is no need to increase it. (4) By mounting the ball bearing 03 , the probe case 02 moves in both the circumferential direction and the axial direction,
Be given a so-called helical scanning can be prevented twisting of thin rubber tire 06, the test body 10 and the probe casing 02 outer peripheral surface
, A constant contact state can be maintained. (5) for using a thin rubber tire 06, a small ultrasonic wave attenuation in thin rubber data <br/> tire 06. In addition, a liquid medium (oil) that has a lower reciprocation rate of ultrasonic waves than a solid medium
A thin layer stored in the oil storage section 012 provided on the outer peripheral surface of the central part
Therefore, it is possible to use a vibrator 01 having a high frequency and a high sensitivity such as a split type. (6) the vibrator 01 a central part 02 a of the probe case 02
By the structure embedded in solid medium to form the outer diameter of the probe casing 02 is reduced, an inner diameter of about 100
It can be applied to the flaw detection of an inner surface of a small diameter pipe of about mm.

[0019]

As described above, the present invention has the following effects. (1) Since the diameter of the probe case can be reduced, the probe case can be applied to a narrow portion which cannot be approached by a conventional tire type probe, and the flaw detection range is greatly expanded. (2) Automatic high-speed flaw detection becomes possible by continuous vertical and horizontal scanning of the probe, so that the cost and the construction period can be reduced by shortening the inspection time. (3) The durability of the vibrator is improved by employing the integrated vibrator embedded in the vibrator case, and a thin rubber tire can be easily replaced, so that an inexpensive probe can be provided. (4) By thinning the rubber tire and the liquid medium, the ultrasonic wave transmission performance is improved, and high-precision flaw detection can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 of the embodiment.

FIG. 3 is a longitudinal sectional view of a first conventional example.

FIG. 4 is a cross-sectional view of the conventional example.

FIG. 5 is a longitudinal sectional view of a second conventional example.

FIG. 6 is a cross-sectional view of the conventional example.

Description of the sign] 01 vibrator 02 probe case 02a central part 02b an intermediate portion 03 ball bearing 03a outer race 05 ball bearing 06 thin rubber tires 06a collar 07a, 07b seal plate 08 the probe cable 09 oil pipe 09a plug 10 test Body 012 Oil storage unit 013 Acrylic resin (solid medium) 15 defects a, b, c clearance d outer surface e outer end surface

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Osamu Miyajima 2-3-30 Gamo, Joto-ku, Osaka-shi, Osaka Inside Eishin Chemical Co., Ltd. (56) References JP-A-61-260159 (JP, A) JP-A JP-A-64-75961 (JP, A) JP-A-3-156366 (JP, A) JP-B-51-8591 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01N 29 / 00-29/28

Claims (1)

(57) [Claims] 1. A large-diameter central portion on the outer periphery and both ends of the central portion.
And a small-diameter roller type provided with a small-diameter intermediate portion disposed with a step in the portion, and a solid portion forming the central axis portion.
Vibration is applied to a solid medium arranged inside one of the circumferential directions.
A probe case with a moving element and an outer peripheral portion at the center
Provided, introduced from one end of the probe case
While covering the outer periphery of the oil storing portion for storing oil, the outer peripheral portion of the intermediate portion and the outer end surface on which the step is formed are closed.
The flanged cylindrical having a flange covering provided clearance
A thin rubber tire that is, at both ends of the probe case
Are respectively inserted into the shaft portion formed integrally with bare <br/> ring bearing which is disposed with a clearance between the outer side surface of the intermediate portion, of the outer peripheral portion and the outer end surface of said intermediate portion
Clearance and outer surface of the intermediate portion and the bearing
The oil reservoir is inserted into the clearance between
An ultrasonic probe, comprising: a sealing means for preventing leakage of oil .