CN116929662A - Device and method for detecting leakage of closed container based on ultrasonic active excitation - Google Patents
Device and method for detecting leakage of closed container based on ultrasonic active excitation Download PDFInfo
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- CN116929662A CN116929662A CN202311202418.6A CN202311202418A CN116929662A CN 116929662 A CN116929662 A CN 116929662A CN 202311202418 A CN202311202418 A CN 202311202418A CN 116929662 A CN116929662 A CN 116929662A
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- 230000005284 excitation Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000003384 imaging method Methods 0.000 claims abstract description 69
- 238000001514 detection method Methods 0.000 claims abstract description 61
- 238000003825 pressing Methods 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims description 32
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 210000001503 joint Anatomy 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to the field of air tightness detection, in particular to a closed container leakage detection device and method based on ultrasonic active excitation, wherein the detection device comprises a support structure, an ultrasonic generator, an acoustic imaging instrument and a driving detection mechanism; the support structure is used for placing the tank body to be tested; the driving detection mechanism comprises a rotary advancing assembly for driving the ultrasonic generator to axially move along the circumferential direction of the tank body and for driving the acoustic imaging instrument to circumferentially rotate around the tank body, and the tank body is also internally provided with an elastic pressing assembly which can enable the ultrasonic generator to be abutted against the inner wall of the tank body. According to the invention, the tank body is subjected to air tightness detection in a mode of combining the ultrasonic generator and the acoustic imaging instrument, the elastic pressing component enables the ultrasonic generator to be in contact with the inner wall of the tank body, so that the vibration source can be effectively acted on the tank body, the acoustic imaging instrument can be conveniently used for capturing the leakage position on the tank body efficiently and accurately, and the air tightness detection effect of the tank body can be improved.
Description
Technical Field
The invention relates to the field of air tightness detection, in particular to a device and a method for detecting leakage of a closed container based on ultrasonic active excitation.
Background
The high-pressure tank body is commonly used for storing high-purity gases such as liquid nitrogen and liquid helium, micro-reactions such as electrochemistry and electrolysis formed in the tank body are easy to cause corrosion of the inner wall to form damage in a long-term working process, the pressure born by the tank body after the damage is poor, and safety accidents are easy to cause if the tank body is not found early. In recent years, accidents frequently occur due to cracks, corrosion and the like of some high-pressure tank bodies, so that the accidents are harmful to life and health of people, and meanwhile, a plurality of psychological injuries are left for people, so that fear of some high-pressure tank bodies is formed.
According to the acoustic imaging test method, sound source distribution data are obtained through a microphone array beam forming technology, a video picture is acquired in real time by matching with a high-definition camera, sound source distribution data and video pictures are subjected to sound image fusion, a changed sound source is dynamically displayed on a display screen, the acoustic imaging test method can be generally used for gas leakage detection and equipment air tightness detection, an ultrasonic sound generator is placed in an object to be tested in a mode of combining the ultrasonic sound generator with an acoustic imager when the air tightness detection process is carried out, if a leakage condition exists, ultrasonic waves emitted by an ultrasonic source in the ultrasonic sound generator are emitted to the outside through leakage holes so as to be accurately captured by the acoustic imager, the detection efficiency of the acoustic imaging test method is extremely high, damage is not caused to the object to be tested, turbulence is formed by gas flow when any gas with pressure leakage or vacuum leakage occurs, sound waves can be emitted by turbulence, sound waves can cover an audible domain and an ultrasonic frequency band, and acoustic signals of the audible domain can be easily covered in a general environment, and noisy environmental noise can be rapidly located to a position of gas leakage through acoustic imaging.
However, for leakage and airtightness detection of pressure vessels and conveying pipelines under non-pressure or vacuum conditions, due to lack of induction conditions, the acoustic imaging test method is difficult to apply, in this case, a vibration source can be applied to the vessels to generate micro-vibration on the vessels, then an acoustic imager is used to detect the vessels, and how the vibration source can be applied to vessels of different sizes and can be effectively applied to the vessel walls, so that the detection effect of the airtightness can be directly affected.
Disclosure of Invention
Aiming at the problems existing in the prior art, the device and the method for detecting the leakage of the closed container based on the ultrasonic active excitation, which are beneficial to improving the air tightness detection effect of the tank body, are provided, wherein the ultrasonic generator can be effectively contacted with the wall of the tank body to be detected, so that a vibration source can be effectively applied to the inner wall of the tank body.
In order to solve the problems in the prior art, the technical scheme provided by the invention is as follows: the device comprises a supporting structure, an ultrasonic generator, an acoustic imaging instrument and a driving detection mechanism for driving the ultrasonic generator and the acoustic imaging instrument to carry out airtight detection on a tank body to be detected; the supporting structure is used for placing the tank body and can seal the opening of the tank body; the ultrasonic generator is positioned at the inner side of the tank body, and the acoustic imaging instrument is positioned at the outer side of the tank body and corresponds to the position of the ultrasonic generator; the driving detection mechanism comprises a rotary advancing component used for driving the ultrasonic generator to axially move along the inner side of the tank body and for driving the acoustic imaging instrument to circumferentially rotate around the tank body, the rotary advancing component is arranged on the outer side wall of the tank body, the ultrasonic generator is connected with the rotary advancing component through a connecting piece, the acoustic imaging instrument is connected with the rotary advancing component, and an elastic pressing component which enables the ultrasonic generator to abut against the inner wall of the tank body is further arranged in the tank body.
When the ultrasonic tank is used, the tank to be tested is placed on the supporting structure, the supporting structure can support and fix the tank, the opening of the tank can be closed, the ultrasonic generator is driven to enter the tank through the rotary advancing assembly, the ultrasonic generator is driven to be in contact with the inner wall of the tank through the elastic pressing assembly, the ultrasonic generator is driven to move along the inner side of the tank through the rotary advancing assembly continuously, the acoustic imaging instrument synchronously moves on the outer wall of the tank, the ultrasonic generator and the acoustic imaging instrument are controlled to intermittently move on the tank, when the ultrasonic generator and the acoustic imaging instrument stop moving, the ultrasonic generator is started, the ultrasonic generator actively applies ultrasonic vibration on the inner wall of the tank, and the acoustic imaging instrument is driven to perform rotary motion around the tank through the rotary advancing assembly, so that whether a leakage hole exists or not is detected, and the tank can be comprehensively air tightness detected after the ultrasonic generator and the acoustic imaging instrument move through the whole tank.
According to the invention, through the cooperation of the ultrasonic generator and the acoustic imaging instrument, the ultrasonic generator actively applies ultrasonic vibration to the inner wall of the tank body to generate micro vibration, the acoustic imaging instrument is used for detecting the tank body, and the ultrasonic generator continuously goes deep in the tank body and the acoustic imaging instrument rotates around the tank body, so that defects at different signals are detected, the air tightness detection of the tank body is realized, the nondestructive detection efficiency of the tank body is improved, and the comprehensive detection of the tank body is ensured; simultaneously, the elastic pressing component promotes the ultrasonic generator to be in contact with the inner wall of the tank body, so that the vibration source can effectively act on the tank body, and the leakage position on the tank body can be captured efficiently and accurately by the acoustic imaging instrument conveniently.
Preferably, the connecting piece is a connecting rod, one end of the connecting rod extends into the tank body, the connecting rod is connected to the supporting structure in a sliding manner and can move along the axial direction of the tank body, and the ultrasonic generator is arranged on the connecting rod; the elastic pressing component is arranged between the ultrasonic generator and the connecting rod, and can enable the ultrasonic generator to be abutted against the inner wall of the tank body.
Preferably, the supporting structure comprises a supporting frame, a top rod, a sealing end cover and a connecting frame, wherein the top rod is arranged at one end of the supporting frame, the closed end of the tank body is in contact with the top rod, a guide cylinder coaxial with the top rod is arranged at the other end of the supporting frame, the sealing end cover is arranged on the guide cylinder through an opening and closing mechanism in a sliding sleeve manner, the opening and closing mechanism drives the sealing end cover to seal the opening end cover of the tank body, the connecting piece is arranged in the guide cylinder in a sliding penetrating manner, and the rotary travelling assembly is connected with the connecting piece through the connecting frame.
Preferably, the opening and closing mechanism comprises a second compression spring sleeved on the guide cylinder, two ends of the second compression spring are fixedly connected with the sealing end cover and the supporting frame, and the outer ring of the sealing end cover is further sleeved with a rubber gasket.
Preferably, the outer ring of the sealing end cover is provided with a first extension rod in an outward extending mode, and a second extension rod corresponding to the first extension rod in a position close to the advancing ring on the connecting frame is arranged in an inward extending mode, and the second extension rod is located between the first extension rod and the ejector rod.
Preferably, the end part of the connecting piece extending into the tank body is fixedly provided with a ring sleeve; the ultrasonic generators are arranged in a plurality, and the ultrasonic generators are arranged on the annular sleeve around the circumferential direction of the annular sleeve; the elastic pressing assembly comprises a telescopic rod, a guide rail and a retraction driving piece, wherein the retraction driving piece drives the telescopic rod to move in the guide rail, one end of the telescopic rod is inserted into the guide rail in a sliding mode, the ultrasonic generator is arranged at the other end of the telescopic rod, the end portion of the guide rail is fixedly connected with the annular sleeve, and the retraction driving piece is arranged between the guide rail and the telescopic rod.
Preferably, the retraction driving piece comprises a first connecting rod and a second connecting rod, a first shaft rod is arranged on the telescopic rod and close to the position of the ultrasonic generator, a second shaft rod is arranged on the guide rail and close to the position of the loop, one end of the first connecting rod is rotationally connected with the first shaft rod, one end of the second connecting rod is rotationally connected with the second shaft rod, and the free end of the first connecting rod is in shaft connection with the free end of the second connecting rod; the ring is sleeved with a lantern ring which is sleeved at the end part of the connecting piece in a rotating mode, a pull rope is arranged between the second connecting rod and the lantern ring, connecting parts for fixing the end parts of the pull rope are arranged on the second connecting rod and the lantern ring, and a main motor used for driving the lantern ring to rotate is arranged at the end part of the connecting piece.
Preferably, a first compression spring is fixedly arranged between the end part of the telescopic rod, which is positioned in the guide rail, and the closed end of the guide rail; the telescopic rod comprises a guide rail, a telescopic rod and a telescopic rod, wherein the telescopic rod is arranged on two sides of the telescopic rod, the positions close to the annular sleeve are respectively provided with a convex rod which penetrates through the guide rail and extends outwards, and the side edges of the guide rail are provided with strip-shaped openings for the convex rods to move along the track direction of the guide rail.
Preferably, a fixed sleeve for fixing the ultrasonic generator is arranged on the telescopic rod; the ultrasonic generator is provided with an amplitude transformer, and the axial direction of the amplitude transformer is perpendicular to the axial direction of the tank body; the end part of the amplitude transformer is provided with a vibrating head which is contacted with the inner wall of the tank body, and a vibrating spring is fixedly connected between the amplitude transformer and the ultrasonic generator.
Preferably, the rotary travelling assembly comprises a travelling ring and a rotary ring, the travelling ring is coaxial with the tank body, the inner diameter of the travelling ring is larger than the outer diameter of the tank body, the guide cylinder is provided with a linear driver for driving the connecting piece to move, and the travelling ring is connected with the end part of the connecting piece extending out of the tank body through the connecting frame; the rotary ring is coaxial and rotationally arranged on the travelling ring, the acoustic imaging instrument is fixedly connected with the rotary ring, the detection end of the acoustic imaging instrument faces the ultrasonic generator, and the travelling ring is provided with a rotary driver for driving the rotary ring to rotate.
The method for detecting the leakage of the closed container based on the ultrasonic active excitation comprises the following steps of:
s1, mounting a tank body on a supporting structure;
s2, the rotary traveling assembly drives the connecting piece to move along the axial direction of the guide cylinder, the ultrasonic generator gradually enters the tank body, the acoustic imaging instrument moves together with the ultrasonic generator, the sealing end cover seals the opening of the tank body, and the tank body is fixed between the sealing end cover and the ejector rod to keep the tank body stable;
s3, the acoustic imaging instrument moves along the outer wall of the tank body, and after the ultrasonic generator enters the tank body, the ultrasonic generator is driven to contact with the inner wall of the tank body through the elastic pressing component;
s4, intermittently moving the connecting piece, enabling the acoustic imaging instrument to rotate around the circumferential direction of the tank body, applying ultrasonic vibration of the ultrasonic generators to the inner wall of the tank body, and enabling the tank body to generate micro vibration so as to enable the acoustic imaging instrument to detect an ultrasonic vibration source around the tank body, and detecting whether the tank body has a leakage hole or not.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, through the cooperation of the ultrasonic generator and the acoustic imaging instrument, the ultrasonic generator actively applies elliptical ultrasonic vibration to the inner wall of the tank body to generate micro vibration, the acoustic imaging instrument is used for detecting the tank body, and the ultrasonic generator continuously goes deep in the tank body and the acoustic imaging instrument rotates around the tank body, so that defects at different signals are detected, the air tightness detection of the tank body is realized, the nondestructive detection efficiency of the tank body is improved, and the comprehensive detection of the tank body is ensured;
(2) According to the invention, the vibrating head is driven to be contacted with the inner wall of the tank body through the retracted driving piece, meanwhile, the vibrating source can be ensured to effectively act on the tank body, so that the tank body can generate micro vibration, the active application of vibration to the tank body by the vibrating head is realized, the defects at different signal positions are effectively detected, the detection efficiency of the leakage holes of the tank body is improved, meanwhile, the leakage positions on the tank body can be conveniently and efficiently captured by the acoustic imaging instrument, and the detection effect of the air tightness of the tank body is improved;
(3) According to the invention, the ultrasonic generator is driven by the rotary traveling assembly to axially move along the inner side of the tank body, the acoustic imaging instrument synchronously moves on the outer wall of the tank body, and the acoustic imaging instrument rotates around the tank body for a circle while intermittently moving along the inner wall of the tank body, so that whether the peripheral wall of the tank body is provided with a vibration source or not is comprehensively detected, the detection of the leakage hole of the tank body is realized, and the detection effect of the air tightness of the tank body is improved.
Drawings
FIG. 1 is a schematic structural diagram of a closed container leak detection device based on ultrasonic active excitation;
FIG. 2 is a schematic diagram of the axial internal structure of the sealed container leak detection device based on ultrasonic active excitation;
FIG. 3 is a schematic diagram of the circumferential internal structure of the closed container leak detection device based on ultrasonic active excitation;
FIG. 4 is a schematic view of the elastic pressing assembly according to the present invention;
FIG. 5 is a schematic view of the resilient pressing assembly of the present invention from another perspective;
FIG. 6 is a schematic view of the internal structure of the elastic pressing assembly according to the present invention;
FIG. 7 is a schematic view of the telescopic rod, guide rail and retraction driving member of the present invention;
FIG. 8 is a schematic view of the telescopic rod, guide rail and retraction drive of the present invention from another perspective;
fig. 9 is an enlarged view at a of fig. 6;
fig. 10 is an enlarged view at B of fig. 2.
The reference numerals in the figures are: 1-a supporting frame; 11-ejector rods; 12-a guide cylinder; 121-a second compression spring; 2-sealing end caps; 21-a rubber gasket; 3-an ultrasonic generator; 31-an amplitude transformer; 32-vibrating head; 33-vibrating springs; 4-acoustic imager; 5-driving a detection mechanism; 51-connecting piece; 511-a collar; 52-a rotary traveling assembly; 521-travelling ring; 5211-a connector; 5212-first extension rod; 5213-a second extension rod; 522-a rotating ring; 523-a rotary drive; 524-linear drive; 6-an elastic pressing component; 61-a telescopic rod; 611-fixing sleeve; 612-a first shaft; 613-a male rod; 62-a guide rail; 621-a second shaft; 622-a first compression spring; 623-a strip port; 63-retracting drive; 631-a first link; 632-a second link; 633-collar; 6331-pull rope; 634-a main motor; 7-tank body.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are orientations or positional relationships indicated by terms "upper", "lower", "left", "right", "long", "short", etc., based on the orientations or positional relationships shown in the drawings, this is merely for convenience in describing the present invention and simplifying the description, and is not an indication or suggestion that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that it is possible for those of ordinary skill in the art to understand the specific meaning of the terms described above according to specific circumstances.
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
example 1
Referring to fig. 1-10, a leak detection device for a closed container based on active excitation of ultrasound is shown, which comprises a support structure, an ultrasonic generator 3, an acoustic imaging apparatus 4, and a driving detection mechanism 5 for driving the ultrasonic generator 3 and the acoustic imaging apparatus 4 to perform airtight detection on a tank 7, wherein the support structure is used for placing the tank 7 to be detected, and can seal an opening of the tank 7.
Specifically, bearing structure includes support frame 1, ejector pin 11, seal end cover 2 and link 5211, and the one end at support frame 1 is installed to ejector pin 11, and the blind end and the ejector pin 11 contact of jar body 7, and the other end of support frame 1 is equipped with the guide cylinder 12 coaxial with ejector pin 11, and the slip cap is equipped with seal end cover 2 on the guide cylinder 12, and seal end cover 2 is established on guide cylinder 12 through closing mechanism slip cap, and closing mechanism drive seal end cover 2 closes jar 7's open end seal.
The ultrasonic generator 3 and the acoustic imaging instrument 4 are positioned between the sealing end cover 2 and the ejector rod 11, the ultrasonic generator 3 is positioned on the inner side of the tank body 7, and the acoustic imaging instrument 4 is positioned on the outer side of the tank body 7 and corresponds to the position of the ultrasonic generator 3.
The driving detection mechanism 5 comprises a rotating advancing component 52 for driving the ultrasonic generator 3 to axially move along the inner side of the tank 7 and for driving the acoustic imaging instrument 4 to circumferentially rotate around the tank 7, the rotating advancing component 52 is arranged on the outer side wall of the tank 7, the ultrasonic generator 3 is connected with the rotating advancing component 52 through a connecting piece 51, the acoustic imaging instrument 4 is connected with the rotating advancing component 52, the connecting piece 51 in the embodiment is a connecting rod, the connecting rod is slidably inserted into the guide cylinder 12 and can axially move along the tank 7, one end of the connecting rod extends into the tank 7, the ultrasonic generator 3 is arranged on the connecting rod, an elastic pressing component 6 which enables the ultrasonic generator 3 to be abutted against the inner wall of the tank 7 is further arranged in the tank 7, and the elastic pressing component 6 is arranged between the ultrasonic generator 3 and the connecting rod.
Specifically, the connecting piece 51 stretches into the tip in the jar body 7, and the connecting piece 51 is equipped with the ring cover 511 towards the fixed tip of ejector pin 11 direction promptly, and supersonic generator 3 has a plurality of, and the circumferencial direction evenly distributed of ring cover 511 is followed to a plurality of supersonic generator 3 is on ring cover 511, all is equipped with elasticity between every supersonic generator 3 and the ring cover 511 and supports and presses subassembly 6, and elasticity supports and presses subassembly 6 can make supersonic generator 3 and the inner wall looks butt of jar body 7.
The rotary traveling assembly 52 is connected to the connector 51 through a connecting frame 5211, and the connecting frame 5211 is a triangular frame in this embodiment. As shown in fig. 2 and 3, the rotary traveling assembly 52 includes a traveling ring 521 and a rotary ring 522, the traveling ring 521 is coaxial with the tank 7, the inner diameter of the traveling ring 521 is larger than the outer diameter of the tank 7, the traveling ring 521 is connected with an end of the connecting piece 51 extending out of the tank 7 through a connecting frame 5211, the rotary ring 522 is coaxial and rotatably disposed on the traveling ring 521, the acoustic imager 4 is fixedly connected with the rotary ring 522, and the acoustic imager 4 is composed of an acoustic imaging array sensor, which is not shown in the drawing. The detection end of the acoustic imager 4 faces the ultrasonic generator 3, the travelling ring 521 is provided with a rotary driver 523 for driving the rotary ring 522 to rotate, and the guide cylinder 12 is provided with a linear driver 524 for driving the connecting piece 51 to move.
When the rotary traveling assembly 52 drives the connecting piece 51 to move and drives the acoustic imaging instrument 4 to rotate, the linear driver 524 drives the connecting piece 51 to move along the guide cylinder 12, the connecting piece 51 is fixedly connected with the traveling ring 521 through the connecting frame 5211, so that the connecting piece 51 can drive the traveling ring 521 to move together when moving, thereby driving the ultrasonic generator 3 and the acoustic imaging instrument 4 to synchronously move, the linear driver 524 drives the connecting piece 51 to intermittently move, when the connecting piece 51 stops moving, the rotary driver 523 drives the rotary ring 522 to rotate, thereby driving the acoustic imaging instrument 4 to rotate around the tank 7, the ultrasonic generators 3 generate vibration sources for the tank 7, the acoustic imaging instrument 4 detects whether the tank 7 leaks out of the vibration sources for a circle, and if the detected part on the tank 7 is provided with a leak hole, the vibration sources are emitted through the leak hole, and the air tightness of the tank 7 is detected.
As shown in fig. 2, the opening and closing mechanism includes a second compression spring 121 sleeved on the guide cylinder 12, and two ends of the second compression spring 121 are fixedly connected with the sealing end cover 2 and the supporting frame 1 respectively. As shown in fig. 10, the outer ring of the seal cap 2 is further sleeved with a rubber gasket 21, and the arrangement of the rubber gasket 21 can improve the tightness between the seal cap 2 and the can 7.
As shown in fig. 2, the outer ring of the seal end cover 2 is provided with a first extension rod 5212 extending outwards, the connecting frame 5211 is provided with a second extension rod 5213 extending inwards at a position close to the travelling ring 521, and the second extension rod 5213 is located between the first extension rod 5212 and the ejector rod 11.
When the sealing end cover 2 is far away from the can body 7, the travelling ring 521 moves to the position of the guide cylinder 12, along with the movement of the connecting frame 5211 in the direction away from the push rod 11, the second extending rod 5213 is contacted with the first extending rod 5212 on the sealing end cover 2, the second extending rod 5213 pushes the first extending rod 5212, thereby pushing the sealing end cover 2 away from the push rod 11, the second compression spring 121 is in a compressed state, so that the can body 7 is taken out or placed, and along with the movement of the travelling ring 521 in the direction of the can body 7 towards the push rod 11, the second compression spring 121 gradually returns to a normal state, the sealing end cover 2 is abutted against the opening end of the can body 7, the rubber gasket 21 on the sealing end cover 2 is contacted with the end of the can body 7, the sealing of the can body 7 is guaranteed, the can body 7 is between the sealing end cover 2 and the push rod 11, the stability of the can body 7 is maintained, after the can body 7 is positioned, the manipulator is removed until the can body 7 is taken out after detection is completed, and the manipulator is used for taking out the can body 7.
As shown in fig. 9, the ultrasonic generator 3 is provided with a horn 31, the end part of the horn 31 is provided with a vibrating head 32, the vibrating head 32 is contacted with the inner wall of the tank 7, a vibrating spring 33 is fixedly connected between the horn 31 and the ultrasonic generator 3, and the axial direction of the horn 31 is perpendicular to the axial direction of the tank 7.
As shown in fig. 4-8, the elastic pressing assembly 6 includes a telescopic rod 61, a guide rail 62 and a retraction driving member 63 for driving the telescopic rod 61 to move in the guide rail 62, the telescopic rod 61 is slidably inserted in the guide rail 62, an end of the guide rail 62 is fixedly connected with the annular sleeve 511, a track direction of the guide rail 62 is perpendicular to a shaft axis direction of the annular sleeve 511, the retraction driving member 63 is arranged between the guide rail 62 and the telescopic rod 61, and a fixing sleeve 611 for fixing the ultrasonic generator 3 is arranged at an outward end of the telescopic rod 61.
When the vibration head 32 of the ultrasonic generator 3 is contacted with the inner wall of the tank 7, the telescopic rod 61 is driven to move in the guide rail 62 by the telescopic driving piece 63, the telescopic rod 61 moves towards the direction of the annular sleeve 511 until the vibration head 32 enters the tank 7, the telescopic rod 61 is driven to move outwards by the telescopic driving piece 63 until the vibration head 32 is contacted with the inner wall of the tank 7, and the tank 7 is subjected to micro vibration due to the fact that the vibration direction of the vibration head 32 is perpendicular to the inner wall of the tank 7, the acoustic imager 4 at the outer side of the tank 7 detects the vibration source, if the vibration source is sensed, a leakage hole exists in the tank 7, and otherwise the tank 7 is normal.
As shown in fig. 7 and 8, the retraction driving member 63 includes a first link 631 and a second link 632, a first shaft lever 612 is provided on the telescopic rod 61 at a position close to the fixed sleeve 611, a second shaft lever 621 is provided on the guide rail 62 at a position close to the ring sleeve 511, one end of the first link 631 is rotatably connected to the first shaft lever 612, one end of the second link 632 is rotatably connected to the second shaft lever 621, and the free end of the first link 631 is axially connected to the free end of the second link 632.
When the retraction driving piece 63 drives the telescopic rod 61 to move in the guide rail 62, the second connecting rod 632 rotates around the axis of the second shaft 621, and the rotation of the second connecting rod 632 drives the first connecting rod 631 to move, so that the telescopic rod 61 is indirectly pulled to move in the guide rail 62, and the contact between the vibration head 32 and the inner wall of the tank 7 is effectively ensured.
As shown in fig. 4-6, a collar 633 sleeved on the end of the connecting piece 51 is rotatably disposed on the collar 511, a pull rope 6331 is disposed between each second connecting rod 632 and the collar 633, the second connecting rod 632 and the collar 633 are respectively provided with a connecting portion for fixing the end of the pull rope 6331, and the end of the connecting piece 51 is provided with a main motor 634 for driving the collar 633 to rotate.
When the second connecting rod 632 is driven to rotate, the main motor 634 is started to drive the collar 633 to rotate, the collar 633 rotates to drive the pull rope 6331 to move until the pull rope 6331 is tightened, the pull rope 6331 pulls the second connecting rod 632 to rotate, the second connecting rod 632 is gradually in a tangential state with the collar 633, and accordingly the telescopic rod 61 is driven to gradually move towards the direction of the collar 633, when the ultrasonic generator 3 enters the tank 7, the vibrating head 32 is conveniently prevented from entering the tank 7, and the vibrating head 32 is prevented from contacting with the end part of the tank 7.
As shown in fig. 7, a first compression spring 622 is fixedly provided between the end of the telescopic rod 61 located in the guide rail 62 and the closed end of the guide rail 62.
When the vibration head 32 enters the tank 7, the main motor 634 drives the collar 633 to rotate backward, and as the telescopic rod 61 is connected with the guide rail 62 through the first compression spring 622, after the telescopic rod 61 moves towards the collar 633, the first compression spring 622 is in a compressed state, and after the pull rope 6331 is loosened, the first compression spring 622 gradually returns to a normal state, so that the vibration head 32 is abutted against the inner wall of the tank 7, and the vibration head 32 is ensured to effectively apply vibration to the tank 7.
When the tank 7 is subjected to airtight detection, firstly, the tank 7 is grabbed and placed on the supporting frame 1 through a manipulator, the manipulator is not shown in the figure, one end of the tank 7 is opened, one end of the tank 7 is closed, the closed end of the tank 7 is contacted with the ejector rod 11, along with the starting of the driving detection mechanism 5, the driving of the connecting piece 51 along the axial direction of the guide cylinder 12 is carried out through the rotating travelling component 52, the ultrasonic generator 3 gradually enters the tank 7, the acoustic imager 4 moves together with the acoustic imager, the sealing end cover 2 closes the opening of the tank 7, the tank 7 is fixed between the sealing end cover 2 and the ejector rod 11, the stability of the tank 7 is maintained, the acoustic imager 4 moves along the outer wall of the tank 7, after the ultrasonic generator 3 enters the tank 7, the elastic abutting component 6 drives the vibrating head 32 to be contacted with the inner wall of the tank 7, the connecting piece 51 intermittently moves, the acoustic imager 4 surrounds the tank 7, a plurality of ultrasonic generators 3 all adopt elliptical ultrasonic vibration to actively apply to the amplitude transformer 31, the amplitude transformer 31 vibrate along with the amplitude transformer, the ultrasonic generator 32 is driven to act on the inner wall 7, the tank 7 is driven to vibrate along with the vibration source 7, the ultrasonic detector is driven to detect whether the tank 7 is completely and the ultrasonic leakage is detected at the end of the two times, the ultrasonic detector is detected to the end of the tank 7, and the ultrasonic detector is not detected, and the defect is detected at the end of the tank 7 is detected, and the ultrasonic detector is detected, and the leak the ultrasonic detector is detected.
According to the invention, through the matching of the ultrasonic generator 3 and the acoustic imaging instrument 4, the ultrasonic generator 3 actively applies elliptical ultrasonic vibration to the inner wall of the tank body 7, so that the tank body 7 generates micro vibration, the acoustic imaging instrument 4 is used for detecting the tank body 7, and along with the continuous deep penetration of the ultrasonic generator 3 in the tank body 7 and the rotation of the acoustic imaging instrument 4 around the tank body 7, defects at different signal positions are detected, the nondestructive detection efficiency of the tank body 7 is improved, the comprehensive detection of the tank body 7 is ensured, meanwhile, the elastic pressing component 6 promotes the vibration head 32 to be contacted with the inner wall of the tank body 7, the vibration source can effectively act on the tank body 7, the leakage position on the tank body 7 is conveniently and efficiently captured by the acoustic imaging instrument 4, and the detection effect of the air tightness of the tank body is facilitated to be improved.
The invention also provides a closed container leakage detection method based on ultrasonic active excitation, which uses the detection device and specifically comprises the following steps:
s1, mounting a tank body 7 on a supporting structure;
s2, the rotary traveling assembly 52 drives the connecting piece 51 to move along the axial direction of the guide cylinder 12, the ultrasonic generator 3 gradually enters the tank body 7, the acoustic imaging instrument 4 moves together with the ultrasonic generator, the sealing end cover 2 closes the opening of the tank body 7 along with the ultrasonic generator, and the tank body 7 is fixed between the sealing end cover 2 and the ejector rod 11, so that the tank body 7 is kept stable;
s3, the acoustic imaging instrument 4 moves along the outer wall of the tank body 7, and after the ultrasonic generator 3 enters the tank body 7, the ultrasonic generator 3 is driven to contact with the inner wall of the tank body 7 through the elastic pressing component 6;
s4, intermittently moving the connecting piece 51, enabling the acoustic imaging instrument 4 to rotate around the circumferential direction of the tank body 7, applying ultrasonic vibration of the ultrasonic generators 3 to the inner wall of the tank body 7, and enabling the tank body 7 to generate micro vibration so that the acoustic imaging instrument 4 can detect an ultrasonic vibration source of the tank body 7 for a circle, and therefore whether leakage holes exist or not is detected.
In the above step S1, the can 7 is automatically grasped to the support frame 1 by the manipulator, and the closed end of the can 7 is in contact with the jack 11.
In the above step S2, the linear driver 524 drives the connecting member 51 to move, and the connecting member 51 drives the ultrasonic generators 3 to gradually enter the tank 7 during the movement process, the acoustic imager 4 moves together with the connecting member, the sealing end cover 2 closes the opening of the tank 7, and the tank 7 is fixed between the sealing end cover 2 and the ejector rod 11, so as to keep the tank 7 stable.
In the above S3, the acoustic imager 4 moves along the outer wall of the tank 7, after the ultrasonic generator 3 enters the tank 7, the elastic pressing component 6 drives the vibration head 32 to contact with the inner wall of the tank 7, specifically, before the ultrasonic generator 3 enters the tank 7, the main motor 634 is started to drive the collar 633 to rotate, the collar 633 rotates to drive the pull rope 6331 to move until the pull rope 6331 is tightened, the pull rope 6331 pulls the second connecting rod 632 to rotate, the second connecting rod 632 is gradually in a tangential state with the collar 633, and the telescopic rod 61 is driven to gradually move towards the direction of the collar 633, so that the vibration head 32 smoothly enters the tank 7. When the vibration head 32 enters the tank 7, the main motor 634 drives the collar 633 to rotate, and as the telescopic rod 61 is connected with the guide rail 62 through the first compression spring 622, after the telescopic rod 61 moves towards the collar 633, the first compression spring 622 is in a compressed state, and after the pull rope 6331 is loosened, the first compression spring 622 gradually returns to a normal state, so that the vibration head 32 is abutted against the inner wall of the tank 7.
In S4, the connecting member 51 intermittently moves, the ultrasonic generator 3 and the acoustic imaging device 4 move along with the connecting member 51, when the connecting member 51 stops moving, the ultrasonic vibrations of the ultrasonic generators 3 are applied to the horn 31, the horn 31 vibrates accordingly, the vibration head 32 acts on the inner wall of the tank 7, the tank 7 generates micro vibrations, the rotary driver 523 drives the rotary ring 522 to rotate, so as to drive the acoustic imaging device 4 to rotate around the tank 7, so that the acoustic imaging device 4 detects the ultrasonic vibration source of one circle of the tank 7, and then detects whether the leak hole exists, and after the ultrasonic generator 3 and the acoustic imaging device 4 move to the end of the closed end of the tank 7, the air tightness detection of the tank 7 is finally completed.
Example 2
The present embodiment is an embodiment 2 of a sealed container leakage detection device based on ultrasonic active excitation, and the difference between the present embodiment and embodiment 1 is that: as shown in fig. 7, in this embodiment, two sides of the telescopic rod 61 and a position close to the ring 511 are provided with a protruding rod 613 extending outwards through the guide rail 62, and a strip-shaped opening 623 for moving the protruding rod 613 is formed on a side edge of the guide rail 62 along the track direction.
When the telescopic link 61 moves in the guide rail 62, in order to prevent the telescopic link 61 from being separated from the guide rail 62, a protruding link 613 is provided on the telescopic link 61, and the protruding link 613 moves in the bar-shaped opening 623 of the guide rail 62, thereby restricting the movement range of the telescopic link 61.
The foregoing examples merely illustrate one or more embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. The sealed container leakage detection device based on ultrasonic active excitation is characterized by comprising a support structure, an ultrasonic generator (3), an acoustic imaging instrument (4) and a driving detection mechanism (5) for driving the ultrasonic generator (3) and the acoustic imaging instrument (4) to perform airtight detection on a tank body (7) to be detected; the supporting structure is used for placing the tank body (7) and can seal an opening of the tank body (7); the ultrasonic generator (3) is positioned at the inner side of the tank body (7), and the acoustic imaging instrument (4) is positioned at the outer side of the tank body (7) and corresponds to the position of the ultrasonic generator (3); the driving detection mechanism (5) comprises a rotating advancing component (52) used for driving the ultrasonic generator (3) to axially move along the inner side of the tank body (7) and used for driving the acoustic imaging instrument (4) to circumferentially rotate around the tank body (7), the rotating advancing component (52) is arranged on the outer side wall of the tank body (7), the ultrasonic generator (3) is connected with the rotating advancing component (52) through a connecting piece (51), the acoustic imaging instrument (4) is connected with the rotating advancing component (52), and an elastic pressing component (6) which enables the ultrasonic generator (3) to be in butt joint with the inner wall of the tank body (7) is further arranged in the tank body (7).
2. The sealed container leakage detection device based on ultrasonic active excitation according to claim 1, wherein the connecting piece (51) is a connecting rod, one end of the connecting rod extends into the tank body (7), the connecting rod is connected to the supporting structure in a sliding manner and can move along the axial direction of the tank body (7), and the ultrasonic generator (3) is arranged on the connecting rod; the elastic pressing component (6) is arranged between the ultrasonic generator (3) and the connecting rod, and can enable the ultrasonic generator (3) to be abutted against the inner wall of the tank body (7).
3. The sealed container leakage detection device based on ultrasonic active excitation according to claim 2, wherein the supporting structure comprises a supporting frame (1), a top rod (11), a sealing end cover (2) and a connecting frame (5211), the top rod (11) is arranged at one end of the supporting frame (1), the closed end of the tank body (7) is in contact with the top rod (11), a guide cylinder (12) coaxial with the top rod (11) is arranged at the other end of the supporting frame (1), the sealing end cover (2) is slidably sleeved on the guide cylinder (12) through an opening and closing mechanism, the opening and closing mechanism drives the sealing end cover (2) to seal the open end of the tank body (7), the connecting piece (51) is slidably arranged in the guide cylinder (12), and the rotary advancing assembly (52) is connected with the connecting piece (51) through the connecting frame (5211).
4. The device for detecting leakage of the closed container based on active excitation of ultrasonic waves according to claim 3, wherein the opening and closing mechanism comprises a second compression spring (121) sleeved on the guide cylinder (12), two ends of the second compression spring (121) are fixedly connected with the sealing end cover (2) and the supporting frame (1), and a rubber gasket (21) is sleeved on the outer ring of the sealing end cover (2).
5. The sealed container leakage detection device based on ultrasonic active excitation according to claim 4, wherein a first extension rod (5212) is arranged on the outer ring of the sealing end cover (2) in an outward extending mode, a second extension rod (5213) corresponding to the first extension rod (5212) is arranged on the connecting frame (5211) in an inward extending mode at a position close to the travelling ring (521), and the second extension rod (5213) is located between the first extension rod (5212) and the ejector rod (11).
6. A sealed container leakage detection device based on ultrasonic active excitation according to claim 3, characterized in that the end of the connecting piece (51) extending into the tank (7) is fixedly provided with a ring sleeve (511); the ultrasonic generators (3) are arranged in a plurality, and the ultrasonic generators (3) are arranged on the annular sleeve (511) around the circumferential direction of the annular sleeve (511); the elastic pressing assembly (6) comprises a telescopic rod (61), a guide rail (62) and a retraction driving piece (63) for driving the telescopic rod (61) to move in the guide rail (62), one end of the telescopic rod (61) is slidably inserted into the guide rail (62), the ultrasonic generator (3) is arranged at the other end of the telescopic rod (61), the end part of the guide rail (62) is fixedly connected with the annular sleeve (511), and the retraction driving piece (63) is arranged between the guide rail (62) and the telescopic rod (61).
7. The sealed container leakage detection device based on active excitation of ultrasonic according to claim 6, wherein the retraction driving piece (63) comprises a first connecting rod (631) and a second connecting rod (632), a first shaft lever (612) is arranged on the telescopic rod (61) and near the ultrasonic generator (3), a second shaft lever (621) is arranged on the guide rail (62) and near the annular sleeve (511), one end of the first connecting rod (631) is rotationally connected with the first shaft lever (612), one end of the second connecting rod (632) is rotationally connected with the second shaft lever (621), and the free end of the first connecting rod (631) and the free end of the second connecting rod (632) are axially connected; the ring sleeve (511) is rotatably provided with a lantern ring (633) sleeved at the end part of the connecting piece (51), a pull rope (6331) is arranged between the second connecting rod (632) and the lantern ring (633), connecting parts for fixing the end parts of the pull rope (6331) are respectively arranged on the second connecting rod (632) and the lantern ring (633), and the end part of the connecting piece (51) is provided with a main motor (634) for driving the lantern ring (633) to rotate.
8. The sealed container leakage detection device based on ultrasonic active excitation according to claim 6, wherein a first compression spring (622) is fixedly arranged between the end part of the telescopic rod (61) in the guide rail (62) and the closed end of the guide rail (62); the telescopic rods (61) are provided with protruding rods (613) which penetrate through the guide rails (62) and extend outwards at positions which are close to the annular sleeve (511), and strip-shaped openings (623) for the protruding rods (613) to move are formed in the side edges of the guide rails (62) along the track direction of the guide rails.
9. The sealed container leakage detection device based on ultrasonic active excitation according to claim 6, wherein a fixing sleeve (611) for fixing the ultrasonic generator (3) is arranged on the telescopic rod (61); the ultrasonic generator (3) is provided with a variable amplitude rod (31), and the axial direction of the variable amplitude rod (31) is perpendicular to the axial direction of the tank body (7); the end part of the amplitude transformer (31) is provided with a vibrating head (32) which is contacted with the inner wall of the tank body (7), and a vibrating spring (33) is fixedly connected between the amplitude transformer (31) and the ultrasonic generator (3).
10. The ultrasonic active excitation-based closed container leakage detection device according to any one of claims 3 to 9, wherein the rotary traveling assembly (52) comprises a traveling ring (521) and a rotary ring (522), the traveling ring (521) is coaxial with the tank body (7), the inner diameter of the traveling ring (521) is larger than the outer diameter of the tank body (7), the guide cylinder (12) is provided with a linear driver (524) for driving the connecting piece (51) to move, and the traveling ring (521) is connected with the end part of the connecting piece (51) extending out of the tank body (7) through the connecting frame (5211); the rotary ring (522) is coaxial and rotationally arranged on the travelling ring (521), the acoustic imaging instrument (4) is fixedly connected with the rotary ring (522), the detection end of the acoustic imaging instrument (4) faces the ultrasonic generator (3), and the travelling ring (521) is provided with a rotary driver (523) for driving the rotary ring (522) to rotate.
11. A method for detecting leakage of a closed container based on ultrasonic active excitation, characterized in that the device for detecting leakage of a closed container according to any one of the preceding claims 3 to 10 is used, and specifically comprises the following steps:
s1, mounting a tank body (7) on a supporting structure;
s2, a rotary traveling assembly (52) drives a connecting piece (51) to move along the axial direction of a guide cylinder (12), an ultrasonic generator (3) gradually enters the interior of a tank body (7), an acoustic imaging instrument (4) moves together with the ultrasonic generator, a sealing end cover (2) seals an opening of the tank body (7) along with the ultrasonic generator, the tank body (7) is fixed between the sealing end cover (2) and a push rod (11), and the stability of the tank body (7) is maintained;
s3, the acoustic imaging instrument (4) moves along the outer wall of the tank body (7), and after the ultrasonic generator (3) enters the tank body (7), the ultrasonic generator (3) is driven to be in contact with the inner wall of the tank body (7) through the elastic pressing component (6);
s4, intermittently moving the connecting piece (51), enabling the acoustic imaging instrument (4) to rotate around the circumference of the tank body (7), applying ultrasonic vibration of the ultrasonic generators (3) to the inner wall of the tank body (7), and enabling the tank body (7) to generate micro-vibration so that the acoustic imaging instrument (4) can detect ultrasonic vibration sources of the tank body (7) for a circle, and therefore whether leakage holes exist or not is detected.
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