KR101615628B1 - Ultrasonic testing device about flaw of subject - Google Patents

Ultrasonic testing device about flaw of subject Download PDF

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Publication number
KR101615628B1
KR101615628B1 KR1020150078083A KR20150078083A KR101615628B1 KR 101615628 B1 KR101615628 B1 KR 101615628B1 KR 1020150078083 A KR1020150078083 A KR 1020150078083A KR 20150078083 A KR20150078083 A KR 20150078083A KR 101615628 B1 KR101615628 B1 KR 101615628B1
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South Korea
Prior art keywords
ultrasonic
unit
subject
frame
ultrasonic waves
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KR1020150078083A
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Korean (ko)
Inventor
임재균
이광원
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엑셀랩 주식회사
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/12—Measuring wheels
    • 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
    • G01N29/221—Arrangements for directing or focusing the acoustical waves
    • 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
    • G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
    • G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
    • 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
    • G01N29/32—Arrangements for suppressing undesired influences, e.g. temperature or pressure variations, compensating for signal noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2101/00—Uses or applications of pigs or moles
    • F16L2101/30—Inspecting, measuring or testing
    • 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
    • G01N2291/26—Scanned objects
    • G01N2291/263—Surfaces
    • G01N2291/2636—Surfaces cylindrical from inside

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The present invention relates to a method for inspecting a defect in a test object (S) by receiving an ultrasonic wave into a test object (S) and radiating ultrasonic waves into the test object (S) The present invention relates to an apparatus for inspecting a defect in a test piece using an ultrasonic wave, wherein the defect inspection performance is improved by reducing the attenuation rate of the ultrasonic wave by forming a water film in close contact with the inside of the test object (S)
The present invention relates to an ultrasonic diagnostic apparatus for detecting defects in a subject (S) by receiving ultrasonic waves into a cylindrical object (S) and irradiating ultrasonic waves to the object (S) A sample defect inspection apparatus comprising: a frame (10); (60) connected to the frame (10) by an elastic connecting means (65) having an outer peripheral surface corresponding to the inner surface of the body (S) and pressing the body (S) so as to contact the inner surface; An ultrasonic transmission / reception unit 70 mounted on the operation unit 60 to transmit / receive ultrasonic waves to / from the subject S; An ejection unit for ejecting water to be mounted on the operation unit 60 so that a water film is formed between the ultrasonic transmission / reception unit 70 and the inspected object S; And a controller for detecting a defective part of the inspected object S on the basis of the reflected wave detected by the ultrasonic transmission / reception unit 70. [

Figure R1020150078083

Description

TECHNICAL FIELD [0001] The present invention relates to an ultrasonic testing apparatus,

More particularly, the present invention relates to an apparatus for inspecting a defect in a test object using ultrasound, and more particularly, to a defect inspection apparatus for inspecting a defect in a test object by introducing ultrasonic waves into a test object and entering a cylindrical test object such as a pipe, The present invention relates to an apparatus for inspecting a defect in a test body using an ultrasonic wave, which inspects defects and improves defect inspection performance by reducing the attenuation rate of ultrasonic waves by forming a water film in close contact with the inside of the body in response to contaminants or diameter changes in the body. will be.

Nondestructive testing is the inspection of parts of a subject, such as a machine or a device, without damage or damage, and radiation, ultrasound, and eddy currents are used. Among various kinds of test objects such as a machine or a device, the present invention focuses on a test object, for example, a pipe that is inserted into the test object and performs nondestructive testing over the entire 360 ° range. Therefore, the following description will focus on the pipe of the subject.

A pipe refers to a thin and long pipe which is hollow and is widely used in daily life such as water pipes and gas pipes and also in various industrial facilities. The pipe used in the mine is compressed air which is used as fresh air or power for mine It is also used for sending to mines.

Among them, LDPE (Low Density Poly Ethylene) high pressure pipe is a pipe which operates under severe conditions of about 3,000 bar and internal pressure of about 250 ℃. It is manufactured by a barrel manufacturing method, to be. Since the pipes are used under these harsh conditions, if accidents caused by cracks occur, they can lead to large accidents and serious problems may occur in production.

Therefore, it is necessary to inspect the LDPE high-pressure pipe for cracks. However, since the cooling jacket is wrapped around the outer periphery of the pipe, it is impossible to inspect the LDPE pipe from the outside. Therefore, there is a need to develop an inspection apparatus capable of inspecting the inside and outside of the pipe.

The inspection of the LDPE high pressure pipe used in the past is based on Eddy Current Testing (ECT). Since it is possible to detect only defects on the inner surface by inserting into the pipe, it is impossible to inspect between the outer surface and the inner surface and the outer surface, Because of the lack of confirmation of the site of inspection at the fast inspection speed, the reliability of the inspection was lowered. As the probe was not flexible enough to change the inside diameter, it was impossible to inspect the pipe defect for the area where the polymer was stuck inside the pipe .

On the other hand, as a technique for inspecting a defective portion of a test object such as a pipe using ultrasonic waves, there is disclosed a "head rotating ultrasonic diagnostic apparatus (hereinafter referred to as " prior art "Quot;).

The above-mentioned prior art discloses an ultrasonic diagnostic apparatus for diagnosing a defective part of the test object in accordance with a waveform or a reception time of a received ultrasonic signal by being inserted into a test object such as a pipe, emitting and receiving ultrasonic waves inside the test object, A rotary head provided with an ultrasonic sensor for emitting and receiving ultrasound in a direction perpendicular to the rotary shaft; a body connected to the rotary head and rotating the rotary head; A sensor control board for converting an ultrasonic signal received from the sensor into a digital signal and outputting the converted digital signal as an optical signal, and a sensor control board having one end connected to the sensor control board and the other end extending to the inside of the body, An optical fiber which is fixed to the body and is separated from the other end of the optical fiber, And a lens which is provided between the other end of the optical fiber and the optical receiver and concentrates the diffusion of the light output from the optical fiber to the optical receiver .

However, when there is a section in which the inside diameter of the test object is changed, there is a problem in that the outside diameter of the diagnostic apparatus can not be changed with respect to the section, and thus it is impossible to pass through the section or inspect the section.

In addition, in the above-described prior art, there is a problem that the accuracy and precision of defects in the inside of the subject are deteriorated because energy loss occurs when the ultrasonic waves emitted from the ultrasonic sensor are reflected when they enter the subject, which is a dense medium.

In addition, there is a problem in that it is difficult to grasp the position and the degree of the defect inside the subject while rotating the rotary head equipped with the ultrasonic sensor in the state where the energy of the ultrasonic wave is lost as described above, .

KR 10-1424070 B1

Disclosure of the Invention The present invention has been made in view of the above problems, and it is an object of the present invention to provide an ultrasonic diagnostic apparatus and a method for detecting a defect in a subject by entering a cylindrical object such as a pipe, emitting ultrasonic waves to the object, The present invention also provides an apparatus for inspecting a defect of a test object using ultrasonic waves that are closely attached to the inside of the test object in response to contaminants and changes in diameter of the inside of the test object.

Another object of the present invention is to provide an apparatus for inspecting a defect of a test object using an ultrasonic wave capable of reducing a decay rate of an ultrasonic wave through formation of a water film.

According to an aspect of the present invention, there is provided an apparatus for inspecting a defect in a test object using ultrasonic waves, the apparatus comprising: An apparatus for inspecting a defect of a test object using an ultrasonic wave to inspect a defect of the inspected object by receiving a reflected wave reflected therefrom, the apparatus comprising: a frame; An operating portion having an outer circumferential surface corresponding to the inner surface of the body and connected to the frame by elastic connecting means for pressing the inner circumferential surface of the body so as to contact the inner surface of the body; An ultrasonic transmission / reception unit mounted on the operation unit to transmit / receive ultrasonic waves to / from the subject; An ejection unit that ejects water to be mounted on the operation unit to form a water film between the ultrasonic transmission / reception unit and the subject; And a control unit for detecting a defective part of the inspected object through the data on the reflected wave detected by the ultrasonic transmission / reception unit.

The ultrasonic transducer includes a longitudinal ultrasonic wave unit arranged to transmit ultrasonic waves in an oblique direction and arranged in the longitudinal direction of the inspected object to detect longitudinal defects of the inspected object, And a transverse ultrasonic wave unit arranged in the circumferential direction of the body to be examined.

And a water film forming part protruding from the actuating part around an outer periphery of the export part and the ultrasonic transmitting / receiving part so that water ejected between the ultrasonic transmitting / receiving part and the inspected object is stored for a predetermined time or more from the export part to form a water film.

At both ends of the frame, a centering portion for adjusting the center axis of the operation portion to coincide with the central axis of the test body is mounted.

Further, a distance sensor for detecting the entry distance into the subject is further provided.

In addition, a base unit is connected to one end of the frame, and an angle conversion unit is provided between the frame and the base unit to rotate the frame relative to the base unit to change the transmission angle of the ultrasonic transmission / reception unit.

According to the apparatus for inspecting a defect of a test object using ultrasonic waves according to the present invention, defects in a test object are inspected by entering a cylindrical test object such as a pipe, radiating ultrasonic waves to the test object, and receiving reflected waves reflected at the defective part, It is possible to closely adhere to the inside of the subject in response to a pollutant or a diameter change of the inside of the subject, and it is also possible to inspect the defect of the subject even in a region where the subject is contaminated or the diameter changes.

Further, according to the present invention, since the decay rate of the ultrasonic wave can be reduced through the formation of the water film, there is an advantage that more accurate and precise defect inspection is possible.

1 is a perspective view showing a configuration of an apparatus for inspecting a defect of a test object using ultrasonic waves according to the present invention,
FIG. 2 is a sectional view showing the configuration of an apparatus for inspecting a defect in a test object using ultrasonic waves according to the present invention,
Fig. 3 is an enlarged view of a portion A in Fig. 2,
4 is an enlarged view of a portion B in Fig. 2,
Fig. 5 is an enlarged view of part C of Fig. 2,
6 is a view showing an ultrasonic wave radiating state in the ultrasonic transmitting / receiving unit according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for inspecting a defect of a test body using ultrasonic waves according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the configuration of a test apparatus for inspecting a test object using ultrasonic waves according to the present invention, and FIG. 2 is a sectional view showing the configuration of a test apparatus for inspecting a test object using ultrasonic waves according to the present invention. 2 (b) to 2 (f) are sectional views taken along lines D-D ', E-E', F-F ', G-G' and H-H ' Fig. FIG. 3 is an enlarged view of part A of FIG. 2, FIG. 4 is an enlarged view of part B of FIG. 2, and FIG. 5 is an enlarged view of part C of FIG. 6 is a diagram showing an ultrasonic wave emission state in the ultrasonic transmission / reception unit according to the present invention.

The apparatus for inspecting a defect 100 using ultrasonic waves according to the present invention includes a frame 10, an operation unit 60, an ultrasonic transmission / reception unit 70, an export unit 80, And a control unit (not shown).

In more detail, the frame 10 forms the skeleton of the inspection apparatus 100 according to the present invention, and is arranged in the longitudinal direction of a cylindrical test object S such as a pipe. Such a frame 10 may be disposed on the central axis O of the inspection apparatus 100 according to the present invention. However, as shown in FIG. 4, the frame 10 may have a shape corresponding to the inner surface of the body S The operation portion 60 is disposed eccentrically with respect to the central axis O in order to secure a space in which the body S can move back and forth in accordance with a change in diameter or the like.

The frame 10 may be used alone, but may be arranged in a staggered manner with respect to the central axis O, as shown in FIGS. 1 and 2 (a) . In this case, when a plurality of frames 10 are used, each frame 10 is arranged on a different plane at different angles. That is, each frame 10 is arranged at different angles with respect to the reference cross section.

A base portion 20 is connected to one end of the frame 10 such that the frame 10 is rotatable. The frame 10 is rotatable at a predetermined angle between the frame 10 and the base 20 so that the angle of the frame 10 relative to the base 20 can be changed. (30).

The angular conversion unit 30 can be used in various configurations as a configuration for changing the angle of the frame 10 with respect to the base unit 20 in a specific angle unit. In this embodiment, as shown in FIG. 2 (e) and FIG. 5, a first groove 21 is formed in the base portion 20 in the circumferential direction, and the ball 31 is formed in the first groove 21 A second groove 11 corresponding to one half of the ball 31 is formed in the frame 10 at a position corresponding to the first groove 21 so that the frame The ball 31 is disengaged from the second groove 11 so that the ball 33 is pressed and the spring 33 is retracted and the second groove 11 is rotated according to the rotation of the frame 10 When the ball 31 reaches the position of the ball 31, the spring 33 is restored and the ball 31 is inserted into the second groove 11.

As shown in Figs. 1, 2A, 2B, and 3 and Fig. 3, at both ends of the frame 10, 10 and the central axis O of the actuating part 60 coincide with each other. The centering portion 40 is provided with three arms 43 each having a wheel 41 arranged at regular intervals so as to be elastically deformed and restored at the same time as the inner diameter of the subject S changes, (60).

A distance sensor 50 is mounted at one end of the frame 10 to detect the distance that the inspection apparatus 100 according to the present invention has moved into the subject S. [ The distance sensor 50 may be a contact type or a contactless type as long as the above object can be achieved. In this embodiment, as shown in FIG. 3, a rotary encoder is used as the distance sensor 50 . The rotary encoder is a type of distance sensor 50 that converts the rotation speed of a shaft into an electrical signal (pulse) and outputs the rotated signal. The rotary encoder 50 is well known to those skilled in the art. A detailed description thereof will be omitted.

The positional relationship between the frame 10, the base portion 20, the centering portion 40 and the distance sensor 50 is determined as shown in Fig. 1 and Fig. 2 (a) And a distance sensor 50 is disposed at the front end of a centering portion 40 disposed at the front end of the frame 10 and the centering portion 40 is disposed at a front end and a rear end of the frame 10, The base portion 20 is disposed between the centering portion 40 and the frame 10 disposed at the rear end. In this case, the positional relationship is one example in the case where the centering unit 40 and the distance sensor 50 are adopted as shown in Figs. 1 and 2 (a) in this embodiment, and the centering unit 40, It is a matter of course that the positional relationship can be changed when the distance sensor 50 and the distance sensor 50 are adopted in different configurations.

The operation section 60 is provided with an elastic connecting means 65 having an outer peripheral surface corresponding to the inner surface of the body S and pressing the inner surface of the body S to be in contact with the inner surface of the body S, . In this embodiment, the elastic connecting means 65 is configured to allow the operating portion 60 to be brought close to and away from the frame 10. In this embodiment, as shown in Fig. 4, A screw 67 inserted into the through hole 13 of the through hole 13 and fastened to the actuating part 60. The screw 67 is passed through and one end is supported by the frame 10, And a spring 69 which is supported by the support member 60.

As shown in FIGS. 1, 2 (a), 2 (c) and 2 (d), the ultrasonic transmitting / receiving unit 70 is mounted on the operation unit 60 to transmit / receive ultrasonic waves to / do. Two ultrasonic transmission / reception units 70 are mounted on one operation unit 60, and the respective ultrasonic transmission / reception units 70 are arranged in an inclined state to transmit ultrasonic waves in an oblique direction.

The ultrasonic transmitting and receiving unit 70 includes a longitudinal ultrasonic wave unit 71 arranged in the longitudinal direction of the subject S for detecting longitudinal defects of the subject S, And a transverse ultrasonic wave unit (73) arranged in the circumferential direction of the inspected object (S) for detecting circumferential defects.

In other words, the longitudinal ultrasonic wave unit 71 and the transverse ultrasonic wave unit 73 are arranged at right angles to each other, the longitudinal ultrasonic wave unit 71 is arranged in the longitudinal direction of the subject S, Are arranged in the circumferential direction of the specimen (S). At this time, as shown in FIG. 6, the ultrasonic waves emitted from the respective ultrasonic units 71 and 73 are formed not in the normal direction but in the oblique direction on the outer peripheral surface of the operating portion 60.

Further, since the angular range in which defects can be inspected by one ultrasonic unit 71 or 73 is limited, as described above, the number of ultrasonic units 71 and 73 provided in each of the plurality of frames 10 The operating portion 60 is mounted to extend the range of angles that can be confirmed by one inspection. This is possible because the angles in the plane between the frames 10 are different from each other, and the angular ranges taken up by the single ultrasonic units 71 and 73 are different from each other.

At this time, the ultrasonic waves radiated to the respective ultrasonic units 71 and 73 enter the inside of the test object S and change into the medium in which the ultrasonic waves move and the reflection toward the inner circumferential surface of the test object S, The energy of the ultrasonic waves is reduced. If the ultrasonic energy is reduced as described above, the energy of the ultrasonic waves reflected from the defective area also decreases, so it is difficult to accurately detect the defective area. Therefore, in the present invention, a configuration is adopted in which a water film is formed between each of the ultrasonic units 71 and 73 and the subject S to minimize the amount of ultrasonic energy entering the subject S and the amount of reflection.

That is, according to the present invention, as shown in FIG. 2 (a) and FIG. 4, water is sprayed to the operation portion 60 so that a water film is formed between the ultrasonic transmitting / receiving portion 70 and the inspected object S, A water outlet 80 is installed. The export unit 80 includes a hose 81 mounted on the through hole 63 formed in the operation unit 60 and a pump connected to the other end of the hose 81.

1 and 4, the water jetted between the ultrasonic transmitting / receiving unit 70 and the inspected object S from the exports unit 80 is stored for a predetermined period of time to form a water film The water film forming part 90 is installed so as to protrude from the operating part 60 around the outer part of the export part 80 and the ultrasonic transmitting and receiving part 70. The water film forming unit 90 delays the time during which water ejected from the exports unit 80 flows from the operation unit 60 due to gravity when the ultrasonic transmission / reception unit 70 is directed to the upper end of the body S Thereby forming a water film having a predetermined thickness inside the water film forming unit 90. [

Meanwhile, the controller performs a function of detecting a defective part of the subject S by synthesizing the data about the reflected wave sensed by the ultrasonic transmitting / receiving unit 70 and the data inputted through the distance sensor 50.

Next, the operation of the apparatus for inspecting a test body using ultrasonic waves according to the present invention will be described.

When the inspection apparatus 100 according to the present invention is inserted into the interior of the inspected object S such as a pipe, the centering unit 40 detects the center axis O of the inspected object S with respect to the center axis O of the inspected object S The center axis O is adjusted so that the center axis O coincides with the center axis O and the distance sensor 50 operates to send data to the control unit to calculate the distance the inspection apparatus 100 enters from the entrance of the body S.

The frame 10 and the actuating part 60 are connected to each other by an elastic connecting means 65 composed of a screw 67 and a spring 69 so that a section in which a foreign matter such as a polymer is stuck to the inside of the body S It is possible to pass and inspect the sections while the operating section 60 approaches and returns to the frame 10 in a section where the inner diameter changes.

The screw 67 of the elastic connecting means 65 is inserted into the through hole 61 and the screw head is inserted into the through hole 13 with a larger diameter than the through hole 13, And the end of the screw 67 is fastened to the actuating part 60 so that the actuating part 60 is movable along the screw 67 with respect to the frame 10. At this time, the actuating part 60 is passed through the inside of the screw 67 and is supported by the frame 10 and the other end by the elastic force of the spring 69 supported by the actuating part 60, 10). In this state, when the pressure is applied to the outside of the operation unit 60 due to the decrease in diameter of the inspected object S or the like, the operation unit 60 may be moved close to the frame 10 while compressing the spring 69 The diameter of the inspection apparatus 100 according to the present invention is reduced.

Also, when the external force to the operating portion 60 disappears, the operating portion 60 returns to the home position due to the restoring force of the spring 69.

In this state, the frame 10 is inspected for a defective portion by the ultrasonic wave with respect to the inspected object S, and the inspected object 100 is inspected in a wide angular range by once entering the inspected object S, And an operation portion 60 having an ultrasonic transmission / reception portion 70 is mounted on each of the frames 10 at a different angle with respect to the reference cross section. At this time, the ultrasonic transmitting and receiving unit 70 is configured to detect a defect in the longitudinal direction and a coupling in the circumferential direction, so that when the inspection apparatus 100 enters the test object S once, And defects in the circumferential direction can be confirmed at the same time.

The data on the reflected wave received by the ultrasonic transmission / reception unit 70 is transmitted to the control unit. The control unit synthesizes the data on the reflected wave and the data input from the distance sensor 50, It is possible to confirm whether or not a defect is formed in the direction.

In addition, the number and angle of the frame 10 may be adjusted so that the inspection apparatus 100 may be inspected once for all 360 ° within the subject S. However, if the entire range of 360 ° can not be covered The frame 10 can be angularly transformed with respect to the base unit 20 through the angular conversion unit 30 to enter the subject S again to confirm the defective portion.

On the other hand, the water pumped from the pump is ejected through the through hole 63 of the operation part 60 via the hose 81 of the export part 80, and the ejected water is dispersed in the four directions do. At this time, water is temporarily stored in the water film forming part 90 protruding from the operation part 60, and a water film having a certain thickness is formed inside the water film forming part 90.

Since the ultrasonic transmitting and receiving unit 70 is installed in the operating unit 60 inside the water film forming unit 90, the ultrasonic waves emitted from the ultrasonic transmitting and receiving unit 70 pass through the water film, . Therefore, the reduction of the ultrasonic energy and the amount of reflection of the ultrasonic wave entering the inspected object S by the water film formed between the ultrasonic transmitting / receiving unit 70 and the inspected object S is minimized, thereby maximizing the ultrasonic energy reflected on the defective part. Accurate detection of the site is possible.

Although the present invention has been described in connection with the preferred embodiments mentioned above, various other modifications and variations will be possible without departing from the spirit and scope of the invention. It is, therefore, to be understood that the appended claims are intended to cover such modifications and changes as fall within the true scope of the invention.

10: frame 11: second groove
20: base portion 21: first groove
30: angle conversion unit 31: ball
33: spring
40: centering part 41: wheel
43: arm
50: Distance sensor
60: operating part 63: through hole
65: elastic connecting means
67: Screw
69: spring
70: ultrasound transmitting / receiving unit 71: longitudinal ultrasound unit
73: transverse ultrasonic unit
80: Export Department 81: Hose
90:
100: Inspection device for defects of a sample using ultrasonic waves
O: center axis S: sample

Claims (6)

An apparatus for inspecting a defect in a sample using an ultrasonic wave for inspecting defects of a subject S by receiving a reflected wave reflected from a defective portion by irradiating ultrasonic waves into the inspected object S by entering the inside of the cylindrical inspected object S 100,
A frame 10;
(60) connected to the frame (10) by an elastic connecting means (65) having an outer peripheral surface corresponding to the inner surface of the body (S) and pressing the body (S) so as to contact the inner surface;
An ultrasonic transmission / reception unit 70 mounted on the operation unit 60 to transmit / receive ultrasonic waves to / from the subject S;
An ejection unit 80 for ejecting water to be mounted on the operation unit 60 so as to form a water film between the ultrasonic transmission / reception unit 70 and the inspected object S;
A controller for detecting a defective part of the subject S through data on reflected waves sensed by the ultrasonic transmission / reception unit 70; And
The exports section 80 and the ultrasonic transmitting and receiving section 70 are arranged so as to surround the exiting section 80 so that the water jetted between the ultrasonic transmitting and receiving section 70 and the inspected object S is stored for a predetermined time or more from the exports section 80, And a water film forming part (90) protruding from the actuating part (60). The method according to claim 1,
The ultrasonic transmission / reception unit (70)
And is configured to transmit ultrasonic waves in an oblique direction,
A longitudinal ultrasonic unit 71 arranged in the longitudinal direction of the subject S for detecting longitudinal defects of the subject S and a longitudinal ultrasonic unit 71 for detecting the circumferential defects of the subject S, And a transverse ultrasonic wave unit (73) arranged in the circumferential direction of the specimen (S). The method according to claim 1,
Further comprising a distance sensor (50) for detecting an entry distance to the inside of the subject (S). The method according to claim 1,
A centering unit 40 is mounted on both ends of the frame 10 to adjust the central axis of the frame 10 to coincide with the central axis of the operation unit 60 with respect to the center axis of the subject S. [ An apparatus for inspecting defects of a test object using ultrasonic waves. delete The method according to claim 1,
A base portion 20 is connected to one end of the frame 10,
An angle conversion unit (not shown) that can rotate the frame 10 with respect to the base unit 20 is provided between the frame 10 and the base unit 20 to change the transmission angle of the ultrasonic transmission / 30. The apparatus for inspecting a defect in a body using ultrasonic waves according to claim 21,
KR1020150078083A 2015-06-02 2015-06-02 Ultrasonic testing device about flaw of subject KR101615628B1 (en)

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Cited By (2)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106846785A (en) * 2017-01-05 2017-06-13 南京工程学院 A kind of solar water heater data transmission system of utilization ultrasonic wave
KR20190082583A (en) 2018-01-02 2019-07-10 조선대학교산학협력단 Apparatus and method for detecting defects in pipeline

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