CA1204851A - Automatic ultrasonic flaw detector for tubes - Google Patents
Automatic ultrasonic flaw detector for tubesInfo
- Publication number
- CA1204851A CA1204851A CA000443822A CA443822A CA1204851A CA 1204851 A CA1204851 A CA 1204851A CA 000443822 A CA000443822 A CA 000443822A CA 443822 A CA443822 A CA 443822A CA 1204851 A CA1204851 A CA 1204851A
- Authority
- CA
- Canada
- Prior art keywords
- detector body
- automatic
- detector
- flaw detector
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
AUTOMATIC ULTRASONIC FLAW DETECTOR FOR TUBES
ABSTRACT OF THE DISCLOSURE
An automatic ultrasonic flaw detector for tubes having a rotatable detector body, an axially movable cylindrical member for rotatably and coaxially supporting the detector body, and a driving device in the cylindrical member for rotating the detector body. The detector body has an ultra-sonic probe, a rotatable acoustic mirror for reflecting the ultrasonic wave from the probe, a calibration test piece with an artificial flaw formed thereon, and a driving device for rotating the acoustic mirror to selectively changing the direction of the reflected ultrasonic wave towards the tube to be inspected or the calibration test piece.
ABSTRACT OF THE DISCLOSURE
An automatic ultrasonic flaw detector for tubes having a rotatable detector body, an axially movable cylindrical member for rotatably and coaxially supporting the detector body, and a driving device in the cylindrical member for rotating the detector body. The detector body has an ultra-sonic probe, a rotatable acoustic mirror for reflecting the ultrasonic wave from the probe, a calibration test piece with an artificial flaw formed thereon, and a driving device for rotating the acoustic mirror to selectively changing the direction of the reflected ultrasonic wave towards the tube to be inspected or the calibration test piece.
Description
34T~
~ACKGROUND OF THE INVENTION
The present invention relates in general to an ultrasonic inspection apparatus adapted into a tube to be examined to ultrasonically detect flaws or defects in a wall of the tube which has a substantial length and difficulty in access, and more particularly to an automatic ultrasonic flaw detector particularly suitable for a pressure tube of a pressure tube type nuclear reactor, although not limited thereto.
The conventional technique of ultrasonic flaw detection will be explained hereinbelow with reference to the flaw detec-tion for a pressure tube of a pressure tube type nuclear reactor, which is subject to a periodical in-service inspection (ISI) according to the rules in -the same way as the other types of nuclear reactors. Since the pressure tube to be inspected is exposed to a high radiation environment both internally and peripherally, the inspection personnel is strictly prohibited to stay near the radiation environment and the inspection is carried out on an automa-tic remote controller so as to protect the inspection personnel at the time of the in-service inspection. At present, a remote controlled, automatically operated ultrasonic flaw de-tector is inserted into the pressure tube to be inspected to examine 5~
the pressure tube from the inside thereof.
In order to ensure the reliability of the inspection data obtained in the ultrasonic flaw detection as described, lt is necessary that the inspection apparatus or flaw detector be calibrated at times by the use of calibration test pieces.
However, the conventional inspection apparatus contains no calibration mechanism therein, and therefore an extremely troublesome and timeconsuming operation must be carried out for calibration of the apparatus. The inspection apparatus used in the pressure tube is contaminated with a radioactive substance, and the apparatus must be handled carefully by the inspection personnel wearing rubber gloves and a mask.
Besides, the conventional inspection apparatus has been calibrat-ed before it is placed into service, and then set in position within the pressure tube taking several ten minutes, and there-after operated for inspection of the pressure tube. When the inspection is finished, the apparatus is removed from the pressure tube taking several ten minutes. Therefore, a recalibration of the apparatus is not possible during the appratus is inserted into the pressure tube for inspeciton, and it can be calibrated only before and after it is practically used for inspection purposes, resulting in a considerable increase in the interval to the forthcoming calibraiton.
In addition, the apparatus cannot be calibrated under the same radiation-diffusion condition as in the pressure tube inspection. Thus, the conventional inspection appara-tus or s~
flaw detector has a serious problems that it does not always provide the sufficiently high reliability in the inspection data.
Furthermore, when an ultrasonic probe is rotated continuos-ly in one direction in the conventional automatic ultrasonic flaw detector, cables for transmitting ultrasonic flaw detection signals and connected to the probe are twisted to be broken.
Therefore, the probe must be of bidirectional rotation type and the rotational direction thereof must be changed repeatedly.
The repeated change of the rotational direction causes the limitation of the driving speed to a certain level, and it necessarily takes a long period of time to examine an elongated tube such as the pressure tube of about 5 meters long or more.
In order to shorten the inspection time, an attempt has been made to provide a plurality of axially movable probes arranged in the circumferential direction so that the entire surface of the pressure tube is inspected at once, which, however, is not practical at all for economical reasons although the inspection speed only is improved.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improve-ment in the automatic ultrasonic flaw detector for tubes, which is free from the drawbacks encountered in the conventional ~z~
apparatus.
Another ob~ect of the invention is to provide an automatic ultrasonic flaw detector which permits an easy calibration operation therefor.
A further object of the ivention is to provide an automatic ultrasonic flaw detector which provides the reliability in the inspection data obtained thereby.
Another object of the invention is to provide an automatic ultrasonic .~law detector, which permits a shortened inspection time.
A ~urther object of the ivention is to provide a new automatlc ultrasonic flaw detector which contains therein a calibration mechanism~
~ nother object of the invention is to provide an automatic ultrasonic flaw detector which permits the calibrati.on operation at any time with the probes set within the flaw detector.
Another object of the invention is to provide an automatic ultrasonic flaw detector which permits a continuous operation for inspection within the tube to be inspected by rotating continuously in one direction the probes mounted therein.
Additional object of the invention is to provide an automa-tic ultrasonic flaw detector, suitable particularly for detect-ing flaws or defects of a pressure tube in a pressure tube type nuclear reactor;
Briefly, the automatic ultrasonic inspeciton apparatus or flaw detector for tubes according to the present invention includes therein a calibration mechanism and has a construction which enables an automatic ultrasonic inspection with ultra-sonic pxobes of the detector rotated continuously in one direc-tion. The flaw detector has calibration test pieces in a detector body, and is capable of freely changing the direction of the ultrasonic waves emitted from the ultrasonic probes in such a manner that the ultrasonic waves advance toward either a tube to be inspected or the calibration test pieces.
The calibration can be carried out at any time with the detector body set within the tube to be inspected. A rotational/station-ary slide contact device is provided for transmission of inspec-tion signals and electric power without encountering the cables entangled or twisted. The slide contact device permits a continuous rotation of the detector elements such as probes in one direction for the flaw detection purposes.
According to the present invention, the automatic ultraso-nic flaw detector for tubes has a detector body rotatable in its circumferential direction, a cylindrical member, movable in its axial direction within the tube to be inspected, for rotatably and coaxially supporting the detector body, and a driving device in the cylindrical member for driving the detector body. In the present invention, the detector body comprises ultrasonic probes, rotatable acoustic mirrors having reflecting surfaces for reflecting the ultrasonic waves from the probes, calibration test pieces having thereon artificial flaws, and a driving device for rotating the acoustic mirrors s~
to selectively change the direction of -the reflected ultrasonic waves towards either the tube to be inspected or the calibration test pieces. The detector body comprises further a slide contact device, at the position where the detector body is rotatably supported by the cylindrical member, for electrically connecting the detector body to an external apparatus so that the detector body can be rotated continuously in one direction for an ultrasonic flaw detection.
In a preferred embodiment of the invention, the cylindrical member has an outer cylinder for axially movably supporting therein the detector body. The cylindrical member has a pinion and the outer cylinder has a rack engaged with the pinion for the axial movement of the detector body. Preferably, two ultrasonic probes are set in a symmetrical, opposing posi-tion relative to an axis of the detector body, and arranged in an axial alignment relation with the acoustic mirrors.
The calibration test pieces are formed such that they are cut out from the shaped material exactly identical with the pressure tube for a practical use.
The detector body, in an embodiment of the invention, has a driving shaft connected to a motor through a speed reducer.
A relatively large toothed wheel is included in the detector body and is connected to an additional motor through an adaition-al speed reducer, so that the large toothed wheel can be rotated independent of the movement of the detector body. Two gears are meshed with the toothed wheel for securing -thereon the S~
acoustic mirrors. The toothed wheel has an inteqral cam, which has an upper surface for contacting with one of the calibration test pieces, and a side surface for contacting with the other calibration test piece. The upper surface of -the cam permits an axial movement of one calibraiton test piece, and the side surface permits a radial movement of the other calibration piece.
The aforementioned slide contact device, which enables a continuous unidirectional rotation of the detector body, has a rotary slide contact member on an outer circumference of the drivi,ng shaft, and an annular slide con-tact rnember around an ou-ter circumference of the rotary slide contact member. The annular slide contact member has on an inner circumference thereof a stationary slide contact, slidably connected to the rotary slide contact member.
Additional objects and features of the present invention will be more clearly understood from the following detailed description of a preferred embodiment of the invention, which will be made with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic, explanatory view of the automatic acoustic flaw detector according to the invention adapte for use i,n inspection of a pressure tube of a pressure tube type nuclear reactor;
Figure 2 is a fragmentary perspective view of the acoustic flaw detector embodying the invention, showing the details of the detector body and i-ts driving mechanism;
Figures 3and 4 are an explanatory perspective view and a plan view, respectively, of an acoustic mirrors and driving mechanism therefor;
Figure 5 is a rear elevation view of the acoustic mirrors and driving mechanism illustrated in Figures 3 and 4;
Figures 6A-6E, Figures 7A-7E and Figures 8A-8E illustrate the movements of acoustic mirrors and calibration test pieces, wherein Figures 6A, 7A and 8A illustrate the same step of the movement, and similarly Figures with the same alphabetical suffix show the same step of movements.
DETAILED DESCRIPTION OF THE INVENTION
. . . _ _ . _ _ _ A preferred embodiment of the present invention will now be described with reference to the drawings. Figure 1 illustrates the construction of an automatic, ultrasonic flaw detector inserted in a pressure tube in a pressure tube type reactor. This ultrasonic flaw detector is adapted to be inserted into a pressure tube 1 from a lower side thereof af-ter a fuel assembly is pulled out therefrom, to carry ou-t the inspection of a flaw in a wall of the pressure tube. The flaw detector ~2(~
has an outer cylinder 6 and a cylindrical membex 5 positioned on the inner side of the outer cylinder 6 and constituting a seal structure, and it is adapted to be se-t in the interior of the pressure tube 1 by a fixing device 10 provided with a seal unit 9. During the inspection of the pressure tube, primary reactor coolant (light water) contained in the pressure tube is sealed by means of the seal unit 9. The cylindrical member 5 can be moved freely in its axial direction owing to a pinion 7 provided on the outer surface thereof, and a rack 8 provided on the inner surface of the outer cylinder 6 and meshed with the pinion 7. A detector body 2 is positioned coaxially on an upper portion of the cylindrical member 5, and adapted to be rotated in its circumferential direction by a driving device 4. Namely, since the driving device 4 is combined with the detector body 2, the latter can be moved axially and rotated in the circumferential direction simul-taneously within the pressure tube 1. These movements of the detector body 2 can be remote-controlled on a control panel 12, which is connected thereto via a cable ll. Therefore, the position of the detector body 2 in its axial and circum-ferential directions can be controlled freely while the inspec-tion of the pressure tube 1 is carried out.
The internal construction of the detector body is shown in Figure 2. In the illustrated embodiment a pair of ultrasonic detector members or probes and a pair of associated elements are provided. The detector body 2 is adapted to be rotated s~
freely by a driving shaft 31 fixed to a lower end thereof.
The driving shaft 31 is connected at the other end thereoE
to a motor 33 via a speed reducer 32. The detector body 2 is provided therein with ultrasonic probes 15a, 15b, which are set in symmetric positions making a substantially 180 to each other with respect to the axis of the detector body, and which are adapted to radiate ultrasonic waves in the axially downward direction, acoustic mirrors 3a, 3b having surfaces for reflecting these ultrasonic waves, calibration test pieces 18a, 18b disposed in the vicinity of the acoustic mirrors 3a, 3b, and a driving device for selectively changing the directions oE the acoustic mirrors 3a, 3b. The ultrasonic probe 15a is used to detect a flaw occurring in the circumferen-tial direction of the pressure tube 1, and the other ultrasonic probe 15b to detect a flaw occurring in the axial direction thereof. These ultrasonic probes 15a, 15b and acoustic mixrors 3a, 3b are so disposed that the axis of them are aligned with each other. The acoustic mirrors 3a, 3b have reflecting surfaces which are inclined at a suitable angle so as to permit the ultrasonic waves, which are emitted from the ultrasonic probes 15a, 15b, to enter these reflecting surfaces at an incident angle suitable for the ultrasonic detection of flaws in the pressure tube. The calibration test pieces 18a, 18b are cut out from a shaped material identical with the pressure tube 1, and have artificial flaws 34, 35 on their respec-tive surfaces.
The full lines shown on the calibration test pieces 18a, 18b s~
in Figure 2 are ar-tificial flaws made on front surfaces (corres-ponding to an inner surface of the pressure tube) thereof, and the broken lines on the calibration test pieces 18a, 18b represent artificial flaws made on rear surfaces (corresponding to an outer surface of the pressure tube) -thereof. Since the detection sensitivity of an ultrasonic flaw detector with respect to a flaw on an inner surface of a pressure tube is different from the sensitivity of same with respect to a flaw on an outer surface even when the sizes of the flaws are the same, the artificial flaws 34, 35 are provided on both the front and rear surfaces of the calibration test pieces 18a, 18b so as to successfully calibrate the flaw detector with respect to flaws occurring on both the inner andouter surfaces of the pressure tube.
The construction and operation of the driving device for selectively changing the directions of the acoustic mirrors and the device for moving the calibration test pieces, which have a close relation with the acoustic mirrors, are explained with reference to Figure 3 to 5 of the drawing which are simpli-fied in illustration for the purpose of simplification. Gears 20a, 20b, on which the acoustic mirrors are set in position, are meshed with a centrally positioned large gear 21 and capable of being pivotally moved. The large gear 21 has a cam 19, which is formed integrally therewith, and is connected to a motor 26 via a motor-driving shaft 29 and a speed reducer 27. When the motor 26, which is fixedly provided in the detec-tor $26~
body 2, is driven, the mirror-driving shaft 29 as well as the acoustic mirrors 3a, 3b can be rotated. The gears 20a, 20b and large gear 21 have teeth at only a part of their respec-tive circumferential surfaces. After these gears 20a, 20b, 21 are disengaged from one another, the gears 20a, 20b are not rotated any further even when the large gear 21 is further rotated, but they slip to be stopped as they face in predeter-mined directions. The cam 19 has first and second cam surfaces 19a, 19b on its upper and side surfaces, respectively. The calibration test piece 18a is urged downward by a spring 17a to engage the first cam surface l9a. The calibration test piece 18a is therefore movable in its axial direction. On the other hand, the calibration test piece 18b is urged toward the axis of the pressure tube 1 by a spring 17b to engage the second cam surface l9b. The calibration test piece 18b is therefore movable in the radial direction of the pressure tube l in accordance with the movement of the cam 19. When the device for moving the acoustic mirrors and calibration test pieces are constructed in this manner as described, a mode of inspecting a pressure tube and a mode of calibrating the flaw detector can be shifted from one to the other instantly by merely driving the motor ~6 by a remote control signal from the control panel 12.
With reference agian to Figure 2, calbes 14a, 14b for transmitting output signals from the ultrasonic probes 15a, 15b and a cable 13 for transmitting electric power to the S~
motor 26 extend through the interior of the mirror-driving shaft 29 to be connected to a rotary slide contact 24, which is formed on an outer circumferential surface of the driving shaft 31. An annular slide contact body 23 is positioned so as to surround an outer circumferentlal surface of the rotary slide contact 24. The rotary slide contact 24 engages a stationary slide contact 22 formed on an inner circumferential surface of the slide contact body 23. The cables 13, 14a, 14b are thus connected to an external apparatus not shown via these slide contacts and a multi-core cable 25. Accordingly, when the detector body 2 is rotated, the cables 13, 14a, 14b are electrically connected to an external apparatus without being twisted, owing to the engagement of the stationary slide contact 22 with the rotary slide contact 24. Reference numerals 28, 30 denote seal rings for maintaining the air-tightness in the interior of the flaw detector.
The operation of the flaw detector according to the present invention will now be described. Figure 2 illustrates the inspection of the pressure tube 1 with the reflecting surfaces of the acoustic mirrors 3a, 3b directed to the inner surface thereof. In order to calibrate the flaw detector in this condition, the mirror-driving shaft 29 may be rotated counter-clockwise in the plan view by the motor 26. The movements of the cam 19 and calibration test piece 18a are schematically shown in Figures 6A to 6E, the movements of the gear 21 and acoustic mirrors 3a, 3b in Figures 7A to 7E, and the movements 5~
of the cam 19 and calibration test piece 18b in Figures 8A
to 8E. When the mirror--driving shaft 29 is rota-ted, the large gear 21 is also rotated counter-clockwise, so that the gears 20a, ZOb are turned (Figs. 7A and 7B), and the reflecting surfaces thereof are in a confronting relation with the artifi-cial flaws 34, 35 on the corresponding calibration test pieces 18a, 18b. The teeth of the gears 20a, 20b are not formed on their respective predetermined circumferential portions as previously mentioned. Thus, when the reflectin~ surfaces of the acoustic mirrors 3a, 3b confront the centers of the artificial flaws 34, 35, the acoustic mirrors 3a, 3b are not turned any more even if the gear 21 is further rotated. Accord-ingly, the pivotal movement of the acoustic mirrors 3a, 3b stops in the mentioned position (Figs. 7C-7E). When the motor 26 is driven, the calibration test pieces 18a, 18b are also moved by an operation of the cam 19. Namely, when the cam 19 is turned, the calibration test piece contacting the first cam surface l9a is moved upward as shown by an arrow in Figures 6D and 6E. During this time, the calibration test piece 18b contacting the second cam surface l9b is moved in the rightward direction as shown by an arrow in Figures 8D and 8E. These movements of the parts will now be further described. In Figures 6A through 8E of the drawing, Figures 6A, 7A and 8A
illustrate the same step or state of the movement and similarly the other figures of the drawing with the same alphabetical suffix show the same state of the movement. Referring to - ~4 -~2~
Figures 6A through 8E, when a calibration operation is started, the large gear 21 is rotated as shown in the figures oE A
and B -to rotate the gears 20a, 20b and thereby direct the acoustic mirrors 3a, 3b fixedly mounted on the gears 20a, 20b toward the calibration test pieces 18a, 18b. Even when the large gear 21 is then further rotated, the acoustic mirrors 3a, 3b are not moved as shown in Figure 7C, and the calibration of the flaw detector using the artificial flaws made on the front surfaces of the calibration test pieces and shown by full lines in Figure 3 is carried out. When the large gear 21 is further turned to cause the cam 19 to move the calibration test pieces 18a, 18b as shown in the figures of D and E, the calibration of the flaw detector using the artificial flaws made on the rear surfaces of the calibration test pieces and shown by broken lines in Figure 3 is carried out. During such pivotal movements of the acoustic mirrors 3a, 3b and axial or radial movement of the calibration test pieces 18a, 18b, the ultrasonic waves from the ultrasonic proves 15a, 15b impinge upon the artificial flaws on the front and rear surfaces of the claibration test pieces 18a, 18b, to enable the flaw detector to be calibrated. The mirror-driving shaft 29 is adapted to be stopped when a calibration operation for the system is completed. When a calibration operation is completed, the above-described operations are reversely carried out to return to the mode of pressure tube inspection. This enables the ultrasonic flaw detection of the pressure tube 5~
1 to be resumed immediately. As referred to previously, the cables 14a, 14b :Eor transmitting output signals from the ultra-sonic probes 15a, 15b and cable 13 for transmitting electric power to the motor 26 extend through the interior of the mirror-driving shaft 29 to be connected to the rotary slide contact 24, and the free end portions of these cables are put together to form a multi-core cable 25, which is connected to the station-ary slide contact 22 and control panel 12. Therefore, even when the detector body 2 is rotated continuously in one direc-tion, ultrasonic signals and electric powder for the motor can be transmitted continuously Wit}lOUt causing the cables to be twisted. Accordingly, the ultrasonic flaw detection of the pressure tube 1 can be done with the detector body
~ACKGROUND OF THE INVENTION
The present invention relates in general to an ultrasonic inspection apparatus adapted into a tube to be examined to ultrasonically detect flaws or defects in a wall of the tube which has a substantial length and difficulty in access, and more particularly to an automatic ultrasonic flaw detector particularly suitable for a pressure tube of a pressure tube type nuclear reactor, although not limited thereto.
The conventional technique of ultrasonic flaw detection will be explained hereinbelow with reference to the flaw detec-tion for a pressure tube of a pressure tube type nuclear reactor, which is subject to a periodical in-service inspection (ISI) according to the rules in -the same way as the other types of nuclear reactors. Since the pressure tube to be inspected is exposed to a high radiation environment both internally and peripherally, the inspection personnel is strictly prohibited to stay near the radiation environment and the inspection is carried out on an automa-tic remote controller so as to protect the inspection personnel at the time of the in-service inspection. At present, a remote controlled, automatically operated ultrasonic flaw de-tector is inserted into the pressure tube to be inspected to examine 5~
the pressure tube from the inside thereof.
In order to ensure the reliability of the inspection data obtained in the ultrasonic flaw detection as described, lt is necessary that the inspection apparatus or flaw detector be calibrated at times by the use of calibration test pieces.
However, the conventional inspection apparatus contains no calibration mechanism therein, and therefore an extremely troublesome and timeconsuming operation must be carried out for calibration of the apparatus. The inspection apparatus used in the pressure tube is contaminated with a radioactive substance, and the apparatus must be handled carefully by the inspection personnel wearing rubber gloves and a mask.
Besides, the conventional inspection apparatus has been calibrat-ed before it is placed into service, and then set in position within the pressure tube taking several ten minutes, and there-after operated for inspection of the pressure tube. When the inspection is finished, the apparatus is removed from the pressure tube taking several ten minutes. Therefore, a recalibration of the apparatus is not possible during the appratus is inserted into the pressure tube for inspeciton, and it can be calibrated only before and after it is practically used for inspection purposes, resulting in a considerable increase in the interval to the forthcoming calibraiton.
In addition, the apparatus cannot be calibrated under the same radiation-diffusion condition as in the pressure tube inspection. Thus, the conventional inspection appara-tus or s~
flaw detector has a serious problems that it does not always provide the sufficiently high reliability in the inspection data.
Furthermore, when an ultrasonic probe is rotated continuos-ly in one direction in the conventional automatic ultrasonic flaw detector, cables for transmitting ultrasonic flaw detection signals and connected to the probe are twisted to be broken.
Therefore, the probe must be of bidirectional rotation type and the rotational direction thereof must be changed repeatedly.
The repeated change of the rotational direction causes the limitation of the driving speed to a certain level, and it necessarily takes a long period of time to examine an elongated tube such as the pressure tube of about 5 meters long or more.
In order to shorten the inspection time, an attempt has been made to provide a plurality of axially movable probes arranged in the circumferential direction so that the entire surface of the pressure tube is inspected at once, which, however, is not practical at all for economical reasons although the inspection speed only is improved.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improve-ment in the automatic ultrasonic flaw detector for tubes, which is free from the drawbacks encountered in the conventional ~z~
apparatus.
Another ob~ect of the invention is to provide an automatic ultrasonic flaw detector which permits an easy calibration operation therefor.
A further object of the ivention is to provide an automatic ultrasonic flaw detector which provides the reliability in the inspection data obtained thereby.
Another object of the invention is to provide an automatic ultrasonic .~law detector, which permits a shortened inspection time.
A ~urther object of the ivention is to provide a new automatlc ultrasonic flaw detector which contains therein a calibration mechanism~
~ nother object of the invention is to provide an automatic ultrasonic flaw detector which permits the calibrati.on operation at any time with the probes set within the flaw detector.
Another object of the invention is to provide an automatic ultrasonic flaw detector which permits a continuous operation for inspection within the tube to be inspected by rotating continuously in one direction the probes mounted therein.
Additional object of the invention is to provide an automa-tic ultrasonic flaw detector, suitable particularly for detect-ing flaws or defects of a pressure tube in a pressure tube type nuclear reactor;
Briefly, the automatic ultrasonic inspeciton apparatus or flaw detector for tubes according to the present invention includes therein a calibration mechanism and has a construction which enables an automatic ultrasonic inspection with ultra-sonic pxobes of the detector rotated continuously in one direc-tion. The flaw detector has calibration test pieces in a detector body, and is capable of freely changing the direction of the ultrasonic waves emitted from the ultrasonic probes in such a manner that the ultrasonic waves advance toward either a tube to be inspected or the calibration test pieces.
The calibration can be carried out at any time with the detector body set within the tube to be inspected. A rotational/station-ary slide contact device is provided for transmission of inspec-tion signals and electric power without encountering the cables entangled or twisted. The slide contact device permits a continuous rotation of the detector elements such as probes in one direction for the flaw detection purposes.
According to the present invention, the automatic ultraso-nic flaw detector for tubes has a detector body rotatable in its circumferential direction, a cylindrical member, movable in its axial direction within the tube to be inspected, for rotatably and coaxially supporting the detector body, and a driving device in the cylindrical member for driving the detector body. In the present invention, the detector body comprises ultrasonic probes, rotatable acoustic mirrors having reflecting surfaces for reflecting the ultrasonic waves from the probes, calibration test pieces having thereon artificial flaws, and a driving device for rotating the acoustic mirrors s~
to selectively change the direction of -the reflected ultrasonic waves towards either the tube to be inspected or the calibration test pieces. The detector body comprises further a slide contact device, at the position where the detector body is rotatably supported by the cylindrical member, for electrically connecting the detector body to an external apparatus so that the detector body can be rotated continuously in one direction for an ultrasonic flaw detection.
In a preferred embodiment of the invention, the cylindrical member has an outer cylinder for axially movably supporting therein the detector body. The cylindrical member has a pinion and the outer cylinder has a rack engaged with the pinion for the axial movement of the detector body. Preferably, two ultrasonic probes are set in a symmetrical, opposing posi-tion relative to an axis of the detector body, and arranged in an axial alignment relation with the acoustic mirrors.
The calibration test pieces are formed such that they are cut out from the shaped material exactly identical with the pressure tube for a practical use.
The detector body, in an embodiment of the invention, has a driving shaft connected to a motor through a speed reducer.
A relatively large toothed wheel is included in the detector body and is connected to an additional motor through an adaition-al speed reducer, so that the large toothed wheel can be rotated independent of the movement of the detector body. Two gears are meshed with the toothed wheel for securing -thereon the S~
acoustic mirrors. The toothed wheel has an inteqral cam, which has an upper surface for contacting with one of the calibration test pieces, and a side surface for contacting with the other calibration test piece. The upper surface of -the cam permits an axial movement of one calibraiton test piece, and the side surface permits a radial movement of the other calibration piece.
The aforementioned slide contact device, which enables a continuous unidirectional rotation of the detector body, has a rotary slide contact member on an outer circumference of the drivi,ng shaft, and an annular slide con-tact rnember around an ou-ter circumference of the rotary slide contact member. The annular slide contact member has on an inner circumference thereof a stationary slide contact, slidably connected to the rotary slide contact member.
Additional objects and features of the present invention will be more clearly understood from the following detailed description of a preferred embodiment of the invention, which will be made with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a schematic, explanatory view of the automatic acoustic flaw detector according to the invention adapte for use i,n inspection of a pressure tube of a pressure tube type nuclear reactor;
Figure 2 is a fragmentary perspective view of the acoustic flaw detector embodying the invention, showing the details of the detector body and i-ts driving mechanism;
Figures 3and 4 are an explanatory perspective view and a plan view, respectively, of an acoustic mirrors and driving mechanism therefor;
Figure 5 is a rear elevation view of the acoustic mirrors and driving mechanism illustrated in Figures 3 and 4;
Figures 6A-6E, Figures 7A-7E and Figures 8A-8E illustrate the movements of acoustic mirrors and calibration test pieces, wherein Figures 6A, 7A and 8A illustrate the same step of the movement, and similarly Figures with the same alphabetical suffix show the same step of movements.
DETAILED DESCRIPTION OF THE INVENTION
. . . _ _ . _ _ _ A preferred embodiment of the present invention will now be described with reference to the drawings. Figure 1 illustrates the construction of an automatic, ultrasonic flaw detector inserted in a pressure tube in a pressure tube type reactor. This ultrasonic flaw detector is adapted to be inserted into a pressure tube 1 from a lower side thereof af-ter a fuel assembly is pulled out therefrom, to carry ou-t the inspection of a flaw in a wall of the pressure tube. The flaw detector ~2(~
has an outer cylinder 6 and a cylindrical membex 5 positioned on the inner side of the outer cylinder 6 and constituting a seal structure, and it is adapted to be se-t in the interior of the pressure tube 1 by a fixing device 10 provided with a seal unit 9. During the inspection of the pressure tube, primary reactor coolant (light water) contained in the pressure tube is sealed by means of the seal unit 9. The cylindrical member 5 can be moved freely in its axial direction owing to a pinion 7 provided on the outer surface thereof, and a rack 8 provided on the inner surface of the outer cylinder 6 and meshed with the pinion 7. A detector body 2 is positioned coaxially on an upper portion of the cylindrical member 5, and adapted to be rotated in its circumferential direction by a driving device 4. Namely, since the driving device 4 is combined with the detector body 2, the latter can be moved axially and rotated in the circumferential direction simul-taneously within the pressure tube 1. These movements of the detector body 2 can be remote-controlled on a control panel 12, which is connected thereto via a cable ll. Therefore, the position of the detector body 2 in its axial and circum-ferential directions can be controlled freely while the inspec-tion of the pressure tube 1 is carried out.
The internal construction of the detector body is shown in Figure 2. In the illustrated embodiment a pair of ultrasonic detector members or probes and a pair of associated elements are provided. The detector body 2 is adapted to be rotated s~
freely by a driving shaft 31 fixed to a lower end thereof.
The driving shaft 31 is connected at the other end thereoE
to a motor 33 via a speed reducer 32. The detector body 2 is provided therein with ultrasonic probes 15a, 15b, which are set in symmetric positions making a substantially 180 to each other with respect to the axis of the detector body, and which are adapted to radiate ultrasonic waves in the axially downward direction, acoustic mirrors 3a, 3b having surfaces for reflecting these ultrasonic waves, calibration test pieces 18a, 18b disposed in the vicinity of the acoustic mirrors 3a, 3b, and a driving device for selectively changing the directions oE the acoustic mirrors 3a, 3b. The ultrasonic probe 15a is used to detect a flaw occurring in the circumferen-tial direction of the pressure tube 1, and the other ultrasonic probe 15b to detect a flaw occurring in the axial direction thereof. These ultrasonic probes 15a, 15b and acoustic mixrors 3a, 3b are so disposed that the axis of them are aligned with each other. The acoustic mirrors 3a, 3b have reflecting surfaces which are inclined at a suitable angle so as to permit the ultrasonic waves, which are emitted from the ultrasonic probes 15a, 15b, to enter these reflecting surfaces at an incident angle suitable for the ultrasonic detection of flaws in the pressure tube. The calibration test pieces 18a, 18b are cut out from a shaped material identical with the pressure tube 1, and have artificial flaws 34, 35 on their respec-tive surfaces.
The full lines shown on the calibration test pieces 18a, 18b s~
in Figure 2 are ar-tificial flaws made on front surfaces (corres-ponding to an inner surface of the pressure tube) thereof, and the broken lines on the calibration test pieces 18a, 18b represent artificial flaws made on rear surfaces (corresponding to an outer surface of the pressure tube) -thereof. Since the detection sensitivity of an ultrasonic flaw detector with respect to a flaw on an inner surface of a pressure tube is different from the sensitivity of same with respect to a flaw on an outer surface even when the sizes of the flaws are the same, the artificial flaws 34, 35 are provided on both the front and rear surfaces of the calibration test pieces 18a, 18b so as to successfully calibrate the flaw detector with respect to flaws occurring on both the inner andouter surfaces of the pressure tube.
The construction and operation of the driving device for selectively changing the directions of the acoustic mirrors and the device for moving the calibration test pieces, which have a close relation with the acoustic mirrors, are explained with reference to Figure 3 to 5 of the drawing which are simpli-fied in illustration for the purpose of simplification. Gears 20a, 20b, on which the acoustic mirrors are set in position, are meshed with a centrally positioned large gear 21 and capable of being pivotally moved. The large gear 21 has a cam 19, which is formed integrally therewith, and is connected to a motor 26 via a motor-driving shaft 29 and a speed reducer 27. When the motor 26, which is fixedly provided in the detec-tor $26~
body 2, is driven, the mirror-driving shaft 29 as well as the acoustic mirrors 3a, 3b can be rotated. The gears 20a, 20b and large gear 21 have teeth at only a part of their respec-tive circumferential surfaces. After these gears 20a, 20b, 21 are disengaged from one another, the gears 20a, 20b are not rotated any further even when the large gear 21 is further rotated, but they slip to be stopped as they face in predeter-mined directions. The cam 19 has first and second cam surfaces 19a, 19b on its upper and side surfaces, respectively. The calibration test piece 18a is urged downward by a spring 17a to engage the first cam surface l9a. The calibration test piece 18a is therefore movable in its axial direction. On the other hand, the calibration test piece 18b is urged toward the axis of the pressure tube 1 by a spring 17b to engage the second cam surface l9b. The calibration test piece 18b is therefore movable in the radial direction of the pressure tube l in accordance with the movement of the cam 19. When the device for moving the acoustic mirrors and calibration test pieces are constructed in this manner as described, a mode of inspecting a pressure tube and a mode of calibrating the flaw detector can be shifted from one to the other instantly by merely driving the motor ~6 by a remote control signal from the control panel 12.
With reference agian to Figure 2, calbes 14a, 14b for transmitting output signals from the ultrasonic probes 15a, 15b and a cable 13 for transmitting electric power to the S~
motor 26 extend through the interior of the mirror-driving shaft 29 to be connected to a rotary slide contact 24, which is formed on an outer circumferential surface of the driving shaft 31. An annular slide contact body 23 is positioned so as to surround an outer circumferentlal surface of the rotary slide contact 24. The rotary slide contact 24 engages a stationary slide contact 22 formed on an inner circumferential surface of the slide contact body 23. The cables 13, 14a, 14b are thus connected to an external apparatus not shown via these slide contacts and a multi-core cable 25. Accordingly, when the detector body 2 is rotated, the cables 13, 14a, 14b are electrically connected to an external apparatus without being twisted, owing to the engagement of the stationary slide contact 22 with the rotary slide contact 24. Reference numerals 28, 30 denote seal rings for maintaining the air-tightness in the interior of the flaw detector.
The operation of the flaw detector according to the present invention will now be described. Figure 2 illustrates the inspection of the pressure tube 1 with the reflecting surfaces of the acoustic mirrors 3a, 3b directed to the inner surface thereof. In order to calibrate the flaw detector in this condition, the mirror-driving shaft 29 may be rotated counter-clockwise in the plan view by the motor 26. The movements of the cam 19 and calibration test piece 18a are schematically shown in Figures 6A to 6E, the movements of the gear 21 and acoustic mirrors 3a, 3b in Figures 7A to 7E, and the movements 5~
of the cam 19 and calibration test piece 18b in Figures 8A
to 8E. When the mirror--driving shaft 29 is rota-ted, the large gear 21 is also rotated counter-clockwise, so that the gears 20a, ZOb are turned (Figs. 7A and 7B), and the reflecting surfaces thereof are in a confronting relation with the artifi-cial flaws 34, 35 on the corresponding calibration test pieces 18a, 18b. The teeth of the gears 20a, 20b are not formed on their respective predetermined circumferential portions as previously mentioned. Thus, when the reflectin~ surfaces of the acoustic mirrors 3a, 3b confront the centers of the artificial flaws 34, 35, the acoustic mirrors 3a, 3b are not turned any more even if the gear 21 is further rotated. Accord-ingly, the pivotal movement of the acoustic mirrors 3a, 3b stops in the mentioned position (Figs. 7C-7E). When the motor 26 is driven, the calibration test pieces 18a, 18b are also moved by an operation of the cam 19. Namely, when the cam 19 is turned, the calibration test piece contacting the first cam surface l9a is moved upward as shown by an arrow in Figures 6D and 6E. During this time, the calibration test piece 18b contacting the second cam surface l9b is moved in the rightward direction as shown by an arrow in Figures 8D and 8E. These movements of the parts will now be further described. In Figures 6A through 8E of the drawing, Figures 6A, 7A and 8A
illustrate the same step or state of the movement and similarly the other figures of the drawing with the same alphabetical suffix show the same state of the movement. Referring to - ~4 -~2~
Figures 6A through 8E, when a calibration operation is started, the large gear 21 is rotated as shown in the figures oE A
and B -to rotate the gears 20a, 20b and thereby direct the acoustic mirrors 3a, 3b fixedly mounted on the gears 20a, 20b toward the calibration test pieces 18a, 18b. Even when the large gear 21 is then further rotated, the acoustic mirrors 3a, 3b are not moved as shown in Figure 7C, and the calibration of the flaw detector using the artificial flaws made on the front surfaces of the calibration test pieces and shown by full lines in Figure 3 is carried out. When the large gear 21 is further turned to cause the cam 19 to move the calibration test pieces 18a, 18b as shown in the figures of D and E, the calibration of the flaw detector using the artificial flaws made on the rear surfaces of the calibration test pieces and shown by broken lines in Figure 3 is carried out. During such pivotal movements of the acoustic mirrors 3a, 3b and axial or radial movement of the calibration test pieces 18a, 18b, the ultrasonic waves from the ultrasonic proves 15a, 15b impinge upon the artificial flaws on the front and rear surfaces of the claibration test pieces 18a, 18b, to enable the flaw detector to be calibrated. The mirror-driving shaft 29 is adapted to be stopped when a calibration operation for the system is completed. When a calibration operation is completed, the above-described operations are reversely carried out to return to the mode of pressure tube inspection. This enables the ultrasonic flaw detection of the pressure tube 5~
1 to be resumed immediately. As referred to previously, the cables 14a, 14b :Eor transmitting output signals from the ultra-sonic probes 15a, 15b and cable 13 for transmitting electric power to the motor 26 extend through the interior of the mirror-driving shaft 29 to be connected to the rotary slide contact 24, and the free end portions of these cables are put together to form a multi-core cable 25, which is connected to the station-ary slide contact 22 and control panel 12. Therefore, even when the detector body 2 is rotated continuously in one direc-tion, ultrasonic signals and electric powder for the motor can be transmitted continuously Wit}lOUt causing the cables to be twisted. Accordingly, the ultrasonic flaw detection of the pressure tube 1 can be done with the detector body
2 turned continuously in one direction at a high speed.
The present invention is not limited to the aforementioned preferred embodiment, and many modifications can be made.
For example, the two-probe configuration, one for flaws of the axial direciton and the other for flaws of the circumferen-tial direction, can be modified to a single probe configuration, or conversely, another configuration with more than two probes so as to meet different purposes. Further, the artificial flaws, which are provided on front and rear surfaces of the calibration test pieces in the aforementioned embodiment so as to enable calibration operations to be carried out with respect to both of these different artificial flaws separately, may be made on front surfaces only or rear surfaces only of ~g~
the calibration test pieces if a flaw occurring on only an inner surface or otherwise only an outer surface of the tube is required to be inspected. In such cases, the construction of the flaw detector can be simplified considerably. In order to carry out a highly-precise calibration operation, a plurality of artificial flaws of various sizes may be provided on the calibration test pieces.
Since the automatic, ultrasonic flaw detector for tubes according to the present invention is constructed as described above, it can produce excellent effects as follows. Since the calibration test pieces are provided in the portions of the interior of the detector body which are in the vicinity of the ultrasonic detector members, a calibration operation can be carried out whenever necessary. Namely, a calibration can be carried out not only immediately before or immediately after the inspection of a tube is completed but also in the midst of a tube-inspecting operation as necessary. This enables the reliability of inspection data to be improved remarkably, and a calibration operation to be carried out in an extremely simplified manner. This flaw detector can be used effectively, especially in the radioactive environment and it is capable of shortening the calibration time to one tenth or less of the time required by the conventional flaw detector. Moreover, even when the properties of a flaw-detecting system vary more or less due to the influence of radiation, the reliability of the inspection data can be further improved since the calibra-L8~i~
tlon of the flaw-detecting system can be done under the condi-tions identical with those for carrying out the inspection of a tube.
According to the present invention, the inspection or a tube can be done as the ultrasonic probes are turned continuous-ly. Therefore, the cost of the ultrasonic flaw detector accord ing to the present invention can be reduced to a level far lower than that of the conventional ultrasonic flaw with multi-channel probes, and the inspection speed can be increased to a level twice as high as that of the conventional flaw detector which requires reversal rotations of the probes repeat-edly.
The present invention is not limited to the aforementioned preferred embodiment, and many modifications can be made.
For example, the two-probe configuration, one for flaws of the axial direciton and the other for flaws of the circumferen-tial direction, can be modified to a single probe configuration, or conversely, another configuration with more than two probes so as to meet different purposes. Further, the artificial flaws, which are provided on front and rear surfaces of the calibration test pieces in the aforementioned embodiment so as to enable calibration operations to be carried out with respect to both of these different artificial flaws separately, may be made on front surfaces only or rear surfaces only of ~g~
the calibration test pieces if a flaw occurring on only an inner surface or otherwise only an outer surface of the tube is required to be inspected. In such cases, the construction of the flaw detector can be simplified considerably. In order to carry out a highly-precise calibration operation, a plurality of artificial flaws of various sizes may be provided on the calibration test pieces.
Since the automatic, ultrasonic flaw detector for tubes according to the present invention is constructed as described above, it can produce excellent effects as follows. Since the calibration test pieces are provided in the portions of the interior of the detector body which are in the vicinity of the ultrasonic detector members, a calibration operation can be carried out whenever necessary. Namely, a calibration can be carried out not only immediately before or immediately after the inspection of a tube is completed but also in the midst of a tube-inspecting operation as necessary. This enables the reliability of inspection data to be improved remarkably, and a calibration operation to be carried out in an extremely simplified manner. This flaw detector can be used effectively, especially in the radioactive environment and it is capable of shortening the calibration time to one tenth or less of the time required by the conventional flaw detector. Moreover, even when the properties of a flaw-detecting system vary more or less due to the influence of radiation, the reliability of the inspection data can be further improved since the calibra-L8~i~
tlon of the flaw-detecting system can be done under the condi-tions identical with those for carrying out the inspection of a tube.
According to the present invention, the inspection or a tube can be done as the ultrasonic probes are turned continuous-ly. Therefore, the cost of the ultrasonic flaw detector accord ing to the present invention can be reduced to a level far lower than that of the conventional ultrasonic flaw with multi-channel probes, and the inspection speed can be increased to a level twice as high as that of the conventional flaw detector which requires reversal rotations of the probes repeat-edly.
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An automatic ultrasonic flaw detector for tubes compris-ing a detector body rotatable in the circumferential direciton within said tube, a cylindrical member, movable within said tube to be inspected in its axial direction, for rotatably and coaxially supporting said detector body, and a first driving device having a first driving shaft in said cylindrical member for driving said detector body, wherein said detector body comprises:
ultrasonic probe means, rotatable acoustic mirror means having a reflecting surface of ultrasonic waves from said ultrasonic probe means, calibration test piece means having thereon an artificial flaw, a second driving device having a second driving shaft for rotating said acoustic mirror means to selectively change the direction of the ultrasonic waves reflected by said acoustic mirror means towards said tube to be inspected and said calibra-tion test piece, and a slide contact device, at said first driving shaft of said first driving device, for electrically connecting said detector body to an external apparatus for controlling said detector body so that said detector body is rotated continuously in one direction for a continuous ultrasonic flaw detection of the tube.
ultrasonic probe means, rotatable acoustic mirror means having a reflecting surface of ultrasonic waves from said ultrasonic probe means, calibration test piece means having thereon an artificial flaw, a second driving device having a second driving shaft for rotating said acoustic mirror means to selectively change the direction of the ultrasonic waves reflected by said acoustic mirror means towards said tube to be inspected and said calibra-tion test piece, and a slide contact device, at said first driving shaft of said first driving device, for electrically connecting said detector body to an external apparatus for controlling said detector body so that said detector body is rotated continuously in one direction for a continuous ultrasonic flaw detection of the tube.
2. The automatic ultrasonic flaw detector according to claim 1, wherein said ultrasonic probe means has two probes arranged in an axial alignment relation with said acoustic mirror means.
3. The automatic ultrasonic flaw detector according to claim 2, wherein said probes are set in a symmetrical, opposing position relative to an axis of said detector body.
4. The automatic ultrasonic flaw detector according to claim 1, wherein said cylindrical member has an outer cylinder for axially movably supporting therein said detector body.
5. The automatic acoustic flaw detector according to claim 4, wherein said cylindrical member has a pinion and said outer cyinder has a rack engaged with said pinion, thereby selectively moving said detector body along with said cylindrical member in the axial direction within said tube.
6. The automatic acoustic flaw detector according to claim 5, wherein said detector body is rotatably supported on top of said cylindrical member such that said detector body is rotated by said first driving device, whereby said detector body is moved in the axial direction and rotated simultaneously to thereby proceed a continuous operation of flaw detection within the tube.
7. The automatic acoustic flaw detector according to claim 1, wherein said second driving device has a toothed wheel connected to said second driving shaft, and at least a single gear meshed with said toothed wheel for movably secur-ing thereon said acoustic mirror means.
8. The automatic acoustic flaw detector according to claim 2, wherein said second driving device has a toothed wheel having an integral cam connected to said second driving shaft and two gears meshed with said toothed wheel for movably securing thereon said acoustic mirror means.
9. The automatic acoustic flaw detector according to claim 8, wherein said cam has a first cam surface on its upper portion and a second cam surface on the circumferential end thereof, and wherein one of said calibration test pieces is urged downward to resiliently contact said first cam surface, and the other calibration test piece is urged to resiliently contact said second cam surface, whereby the first-mentioned calibration test piece is movable in its axial direction, and the second-mentioned is movable in the radial direction of said tube.
10. The automatic acoustic flaw detector according to claim 1, wherein said calibration test piece is cut out from a shaped material identical with said pressure tube.
11. The automatic acoustic flaw detector according to claim 1, wherein said slide contact device has a rotary slide contact member on an outer circumferential surface of said first driving shaft, and an annular slide contact body around an outer circumference of said rotary slide contact member, said annular slide contact body having on an inner circumference thereof a stationary slide contact member slidably connected to said rotary slide contact member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57-233247 | 1982-12-25 | ||
| JP57233247A JPS59119259A (en) | 1982-12-25 | 1982-12-25 | Automatic ultrasonic flaw detector for tube wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1204851A true CA1204851A (en) | 1986-05-20 |
Family
ID=16952073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000443822A Expired CA1204851A (en) | 1982-12-25 | 1983-12-20 | Automatic ultrasonic flaw detector for tubes |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS59119259A (en) |
| CA (1) | CA1204851A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3040720A1 (en) * | 2013-08-30 | 2016-07-06 | Kawasaki Jukogyo Kabushiki Kaisha | Ultrasonic flaw-detection device and method for operating ultrasonic flaw-detection device |
| CN106770662A (en) * | 2017-02-16 | 2017-05-31 | 沈阳工业大学 | Tower barrel of wind generating set line flaw detection device |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01305351A (en) * | 1988-06-03 | 1989-12-08 | Hitachi Ltd | Inspecting apparatus |
| JPH0625755B2 (en) * | 1988-07-22 | 1994-04-06 | 動力炉・核燃料開発事業団 | Ultrasonic flaw detector in branch pipe |
| RU2607258C1 (en) * | 2015-08-11 | 2017-01-10 | Публичное акционерное общество "Транснефть" (ПАО "Транснефть") | Method of intratubal ultrasonic inspection |
| RU2690975C1 (en) * | 2018-10-03 | 2019-06-07 | Публичное акционерное общество "Транснефть" (ПАО "Транснефть") | Method of determining signal from pipe wall according to power lines statistics pid cd data |
| CN112782284B (en) * | 2020-12-31 | 2022-09-06 | 中冶检测认证(上海)有限公司 | Ultrasonic detection auxiliary device for narrow space |
| CN114295678B (en) * | 2021-12-07 | 2023-09-19 | 北京卫星制造厂有限公司 | Detection equipment for satellite force bearing barrel |
-
1982
- 1982-12-25 JP JP57233247A patent/JPS59119259A/en active Granted
-
1983
- 1983-12-20 CA CA000443822A patent/CA1204851A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3040720A1 (en) * | 2013-08-30 | 2016-07-06 | Kawasaki Jukogyo Kabushiki Kaisha | Ultrasonic flaw-detection device and method for operating ultrasonic flaw-detection device |
| EP3040720A4 (en) * | 2013-08-30 | 2017-04-05 | Kawasaki Jukogyo Kabushiki Kaisha | Ultrasonic flaw-detection device and method for operating ultrasonic flaw-detection device |
| US10161918B2 (en) | 2013-08-30 | 2018-12-25 | Kawasaki Jukogyo Kabushiki Kaisha | Ultrasonic flaw detector and method of operating ultrasonic flaw detector |
| CN106770662A (en) * | 2017-02-16 | 2017-05-31 | 沈阳工业大学 | Tower barrel of wind generating set line flaw detection device |
| CN106770662B (en) * | 2017-02-16 | 2023-04-07 | 沈阳工业大学 | Online flaw detection device for tower of wind generating set |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6367138B2 (en) | 1988-12-23 |
| JPS59119259A (en) | 1984-07-10 |
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