CN109696486A - A kind of bellows detection method - Google Patents
A kind of bellows detection method Download PDFInfo
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- CN109696486A CN109696486A CN201811614872.1A CN201811614872A CN109696486A CN 109696486 A CN109696486 A CN 109696486A CN 201811614872 A CN201811614872 A CN 201811614872A CN 109696486 A CN109696486 A CN 109696486A
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
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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
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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Abstract
The present embodiments relate to ultrasonic detection technology field more particularly to a kind of bellows detection methods.Bellows detection method includes: in bellows axial direction, and every the first detecting distance, using the first ultrasonic probe, along bellows, circumferentially detection one is enclosed, the circumferential detection echo of detection first；It detects first axis using the second ultrasonic probe along the axially consecutive detection of bellows in bellows axial direction and detects echo；The height of first circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, the corresponding bellows position existing defects of the circumferential detection echo of judgement first；The height of first axis detection echo is greater than the axial distance-amplitude curve obtained in advance, determines the corresponding bellows position existing defects of first axis detection echo.Technical solution provided by the embodiment of the present disclosure realizes the effect of the complete detection of ripple defective tube.
Description
Technical field
The present embodiments relate to ultrasonic detection technology field more particularly to a kind of bellows detection methods.
Background technique
High-temperature and pressure pipeline is the most common equipment in thermal power plant.Bellows allows stroke range that can freely stretch in pipeline
Contracting, limits when more than maximal dilation amount, guarantees the safe operation of pipeline.Bellows is in Large-scale fire-electricity unit bearing pipe, especially
It is in the communicating pipe of steam turbine side using more.Bellows is in operation due to stress, and the effects of dielectric corrosion can crack, if long
Cracking can occur for phase operation so that forming penetrability opening, cause medium to reveal, cause unit outage.
Expansion joint for pipeline ripple pipe crack is detected under shutdown status, can be expanded under operation with Crack prevention
Exhibition causes to penetrate, and guarantees stable operation of unit.There are no the detection methods for being directed to bellows in the prior art.
Therefore, a kind of detection method for bellows how is provided, just at the demand of the prior art.
Summary of the invention
The embodiment of the present disclosure provides a kind of bellows detection method, to realize the defect of accurate detection bellows.
The embodiment of the invention provides a kind of bellows detection methods, are used to detect the defect of bellows, bellows inspection
Survey method includes:, every the first detecting distance, circumferentially to be examined using the first ultrasonic probe along bellows in bellows axial direction
Survey a circle, the circumferential detection echo of detection first；In bellows axial direction, axially connected using the second ultrasonic probe along bellows
Continuous detection, detection first axis detect echo；The height of first circumferential detection echo is greater than the circumferential distance-wave amplitude obtained in advance
Curve determines that first circumferentially detects the corresponding bellows position existing defects of echo；The height of first axis detection echo is greater than
Axial distance-the amplitude curve obtained in advance determines the corresponding bellows position existing defects of first axis detection echo.
Preferably, bellows detection method further include: the first ultrasonic probe is overturn first angle, in detection test block axis
To direction, every the first detecting distance, using the first ultrasonic probe, along bellows, circumferentially detection one is enclosed, the circumferential inspection of detection second
Survey time wave；Second ultrasonic probe is overturn second angle, in detection test block axial direction, using the second ultrasonic probe along wave
The axially consecutive detection of line pipe, the axial detection echo of detection second；The height of second circumferential detection echo is greater than the week obtained in advance
To distance-amplitude curve, determine that second circumferentially detects the corresponding bellows position existing defects of echo；Second axial detection echo
Height be greater than axial distance-amplitude curve for obtaining in advance, determine that the corresponding bellows position of the second axial detection echo is deposited
In defect.
Preferably, first ultrasonic probe is single-chip angle probe, the ultrasonic wave frequency of the first ultrasonic probe transmitting
Rate is 1MHz~3MHz, and the first ultrasonic probe detection faces are cambered surface, the cambered surface axial direction and the first ultrasonic probe acoustic beam side
To in one plane, the radian of the cambered surface is consistent with the cambered surface radian of institute's bellows；Second ultrasonic probe is single
The ultrasonic frequency of chip angle probe, the transmitting of the second ultrasonic probe is 1MHz~3MHz, and the second ultrasonic probe detection faces are
Cambered surface, the cambered surface is axial vertical with the second ultrasonic probe sound beam direction, the radian of the cambered surface and the cambered surface of institute's bellows
Radian is consistent.
Preferably, the circumferential distance-amplitude curve and axial distance-amplitude curve acquisition methods include: first
Ultrasonic probe is placed in detection test block, and the detection test block includes circumferential cutting and axial cutting；It is axial in detection test block
Direction is respectively that the n-th echo of circumferential cutting is detected at n × first distance in the circumferential cutting distance of distance, and n is positive integer；With week
First decibel is subtracted as evaluation line to the n-th echo of cutting, draws circumferential distance-amplitude curve；Second ultrasonic probe is put
Set the opposite side in detection test block with axial cutting；Axial cutting is detected every second distance in detection test block axial direction
Echo；Second decibel is subtracted as evaluation line using axial cutting echo, draws axial distance-amplitude curve.
Preferably, the first distance is 70mm~130mm, and the second distance is 18mm~22mm.
Preferably, described first decibel is 5dB~7dB, and described second decibel is 5dB~7dB.
Preferably, described that first ultrasonic probe is placed in detection test block, the detection test block includes circumferential cutting
Before axial cutting, further includes: use spread speed of the first ultrasonic probe detection ultrasonic wave in detection test block.
Preferably, it is described using the first ultrasonic probe detection ultrasonic wave detection test block on spread speed include:
The first echo of cutting is detected at the circumferential cutting third distance of distance, detection cutting second is returned at distance the 4th distance of circumferential cutting
Wave detects cutting third echo at distance the 5th distance of circumferential cutting, is returned according to the first echo of cutting of detection, cutting second
The time of wave and cutting third echo, spread speed of the calibration ultrasonic wave in detection test block.
Preferably, third distance is 150mm~250mm, and the 4th distance is 450mm~550mm, the described 5th
Distance is 250mm~350mm.
Preferably, using at 450mm~550mm circumferential the n-th echo of cutting as circumferential defect detection sensitivity；Ultrasonic wave is visited
Head is placed on the opposite side in detection test block with axial cutting, and is located on the same line ultrasonic probe and axial cutting
When, the axial cutting echo gain third decibel of detection as axial flaw detection sensitivity, the third decibel be 5dB~
7dB。
Compared with prior art, the embodiment of the present disclosure passes through axial and circumferential by providing a kind of bellows detection method
The defect for detecting bellows, realizes the effect of the complete detection of ripple defective tube, and detection defect is accurate.
Detailed description of the invention
Fig. 1 is the schematic perspective view for the detection test block that first embodiment of the invention provides；
Fig. 2 is the schematic cross-sectional view for detecting test block at A-A along Fig. 1.
Fig. 3 is the partial enlargement diagram detected at the B of test block in Fig. 2.
Fig. 4 is a kind of structural schematic diagram of the deformation for the detection test block that first embodiment of the invention provides；
Fig. 5 is the flow diagram for the bellows detection method that second embodiment of the invention provides；
Fig. 6 is the flow diagram for the bellows detection method that third embodiment of the invention provides；
Fig. 7 is the circumferential distance-amplitude curve and the acquisition of axial distance-amplitude curve that fourth embodiment of the invention provides
The flow diagram of method.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing or method described as flow chart.Although each step is described as the processing of sequence by flow chart, many of these
Step can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of each step can be rearranged.When its operation
The processing can be terminated when completion, it is also possible to have the additional step being not included in attached drawing.The processing can be with
Corresponding to method, function, regulation, subroutine, subprogram etc..
In addition, term " first ", " second " etc. can be used to describe herein various directions, movement, step or element etc.,
But these directions, movement, step or element should not be limited by these terms.These terms are only used to by first direction, movement, step
Rapid or element and another direction, movement, step or element are distinguished.For example, the case where not departing from scope of the present application
Under, it can be second speed difference by First Speed difference, and similarly, it is poor second speed difference can be known as First Speed
Value.First Speed difference and second speed difference both speed difference, but it is not same speed difference.Term " the
One ", " second " etc. is not understood to indicate or imply relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more of the features.
In the description of the present invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise clearly specific limit
It is fixed.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Referring to Fig. 1, the first embodiment of the present disclosure provides a kind of detection test block 10, it is used to simulate detected ripple
Pipe as whether ultrasonic probe damages, or tests out distance-amplitude curve for instrument used in test ultrasound examination,
For subsequent damage judgement.Detection test block 10 includes tube wall 11, the first pin 12 and the second pin that cross section is arc-shaped
13, the first pin 12 is connected with two opposite sides of tube wall 11 respectively with the second pin 13.
Referring to Fig. 1, the shape of tube wall 11 is substantially in tubular, the guide groove 117 of perforation is also provided on tube wall 11, so that
The cross-sectional shape of the tube wall 11 is in " C " font, i.e. the cross section of tube wall 11 is unclosed at a circle, but substantially in circle
Shape has lacked a part relative to circle, therefore tube wall 11 includes opposite both ends of the surface, respectively first end face 111 and second end face
112, tube wall 11 further includes opposite two sides, respectively first side 113 and second side 114.The shape on the surface of tube wall 11
Shape is consistent with the shape of bellows surface, as the radian of tube wall 11 and the radian of bellows are consistent.Preferably, the diameter of tube wall 11
It is consistent with the diameter of bellows, the thickness of tube wall 11 and the consistency of thickness of bellows, it is preferable that tube wall 11 with a thickness of 3mm~
7mm.The length of tube wall 11 is 550mm~700mm, and the length of tube wall 11 is preferably 650mm or 600mm.The material of tube wall 11 and
The material of bellows is identical or the acoustical behavior of tube wall 11 and the acoustical behavior of bellows it is close, ripple is simulated in detection test block 10
Pipe die is intended more true, so that subsequent measurement is more accurate.As a kind of selection, the material of tube wall 11 is austenite stainless
Steel.It is appreciated that the cross section of tube wall 11 can also close into a circle, i.e., guide groove 117 is not opened up on tube wall 11.
Referring to Figure 2 together and Fig. 3, cutting is offered on tube wall 11, it is preferable that cutting is opened in the interior table of tube wall 11
Face.Cutting includes axial cutting 116 and circumferential cutting 115, and circumferential cutting 115 extends along the circumferential direction of tube wall 11, axial to carve
Slot 116 extends along the axial direction of tube wall 11.Specifically, axial cutting 116 and circumferential cutting 115 are all opened in the interior of tube wall 11
Surface.Axial direction is the direction x in Fig. 1, and circumferential direction is the direction y in Fig. 1.
The circumferential direction cutting 115 is located at the opposite side of the guide groove 117.Preferably, circumferential cutting 115 is away from first side
113 and second side 114 be equidistant, circumferential distance of the cutting 115 away from first side 113 is 8~12mm, i.e., circumferential cutting
One end of 115 close first side 113 is 8~12mm, preferably 10mm far from the distance of first side 113.Circumferential cutting 115
Distance away from 11 1 end face of tube wall is 40mm~70mm, preferably 50mm.In the present embodiment, circumferential cutting 115 is away from second end face
112 distance is 50mm.The length of circumferential cutting 115 is 5mm, width 0.2mm, depth 0.5mm.
The axial direction cutting 116 is located between circumferential cutting 115 and guide groove 117.In the present embodiment, axial cutting 116
In axial cutting 116 close to the side of first side 113, distance of the axial cutting 116 apart from second side 114 is greater than distance the
The distance of a side 113.Axial cutting 116 113 edge 3mm~7mm away from the first side of tube wall 11, i.e. 116 edge of axial cutting
The curved surfaces of tube wall 11 need 3mm~7mm to reach first side 113, it is preferable that first side of the axial cutting 116 away from tube wall 11
113 edge 5mm of side.Distance of the axial cutting 116 away from 11 1 end face of tube wall is 140mm~170mm, preferably 150mm, this implementation
In example, distance L1 of the circumferential cutting 115 away from second end face 112 is 150mm.The length L of axial cutting 116 is 5mm, and width D is
0.2mm, depth 0.5mm.
First pin 12 and first side 113 connect, and the second pin 13 and second side 114 connect.Preferably, the first pipe
When foot 12 and the second pin 13 are connect with tube wall 11, arc transition connection.First pin 12 and the second pin 13 play it is fixed and
Supporting role, when tube wall 11 is placed on and detects in the planes such as desktop, the first pin 12 and the second pin 13 prevent tube wall 11 from rolling
It is dynamic.
Referring to Fig. 4, the first pin 12 and the second pin 13 can be omitted setting, such as detection test block 10 can be placed on one
It is a in reeded device 20, can prevent detection test block 10 roll.
Cutting is opened up on the tube wall 11 of the present embodiment, cutting is used to simulate the defect of bellows interior, passes through design and wave
The similar detection test block 10 of line pipe structure, so that the detection test block 10 can test the property of ultrasound detection in bellows detection
Energy, sensitivity.
Referring to Fig. 5, the second embodiment of the present disclosure based on previous embodiment, provides a kind of bellows detection side
Method is used to detect the defect of bellows.The bellows detection method includes:
S11: in bellows axial direction, every the first detecting distance, using the first ultrasonic probe along bellows circumferential direction
One circle of detection, the circumferential detection echo of detection first；
S12: in bellows axial direction, using the second ultrasonic probe along the axially consecutive detection of bellows, detection first
Axial detection echo；
The height of S13: the first circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, determines first week
To the corresponding bellows position existing defects of detection echo；
S14: the height of first axis detection echo is greater than the axial distance-amplitude curve obtained in advance, determines first axle
To the corresponding bellows position existing defects of detection echo.
In S11, bellows is to detect whether defective bellows.Ultrasonic probe has certain detection model
When enclosing, therefore using ultrasonic probe, it can be detected every a distance primary.Using the first ultrasonic probe first along the week of bellows
It is enclosed to detection one, then in mobile first detecting distance of axial direction of bellows, then with the first ultrasonic probe along bellows week
It encloses, is repeated in detection one, can detect bellows whole position.It is appreciated that occur dirt, defect etc. on bellows,
Ultrasonic wave returns, and can measure echo, i.e., the first circumferential detection echo.Wherein, the first ultrasonic probe is single-chip angle probe,
The ultrasonic frequency of first ultrasonic probe transmitting is that the ultrasonic probe height of 1MHz~3MHz, preferably 2MHz, first is
10mm, the first ultrasonic probe detection faces are cambered surface, and the cambered surface is axial flat at one with the first ultrasonic probe sound beam direction
On face, the radian of the cambered surface is consistent with the cambered surface radian of institute's bellows；The wafer size of first ultrasonic probe is 6 × 6mm,
First ultrasonic probe incident angle is 64 degree.It is appreciated that the first ultrasonic probe may be other kinds of probe, make
First ultrasonic probe detection faces are cambered surface, the cambered surface it is axial with the first ultrasonic probe sound beam direction in one plane,
And first ultrasonic probe volume it is suitable.
In S12, the second ultrasonic probe is placed on the surface of bellows, makes the second ultrasonic probe by bellows
One end is mobile to the other end, can be detected first axis detection echo.It is appreciated that occur dirt, defect etc. on bellows,
Ultrasonic wave returns, and can measure echo, i.e. first axis detects echo.Wherein, the second ultrasonic probe is single-chip angle probe,
The ultrasonic frequency of second ultrasonic probe transmitting is that the ultrasonic probe detection faces of 1MHz~3MHz, preferably 2MHz, second are
Cambered surface, the cambered surface is axial vertical with the second ultrasonic probe sound beam direction, the radian of the cambered surface and the cambered surface of institute's bellows
Radian is consistent.The wafer size of second ultrasonic probe is 6 × 6mm, and the second ultrasonic probe incident angle is 64 degree.The second surpass
The pin interfaces of sonic probe are placed on the opposite side of chip.It is appreciated that the second ultrasonic probe may be other types
Probe, make the second ultrasonic probe detection faces cambered surface, the cambered surface is axial vertical with the second ultrasonic probe sound beam direction,
And second ultrasonic probe volume it is suitable.
In S13, circumferential distance-amplitude curve obtains in advance, and acquisition modes subsequent embodiment is explained again.Inspection
The circumferential detection echo of first measured first excludes couplant, the non-defective echo such as dirt, if the height of the first circumferential detection echo
Degree is greater than the circumferential distance-amplitude curve obtained in advance, then the corresponding bellows position existing defects of first axis detection echo,
If circumferential distance-amplitude curve that the height of the first circumferential detection echo is less than and obtains in advance, first axis detect echo
Defect is not present in corresponding bellows position.
In S14, axial distance-amplitude curve obtains in advance, and acquisition modes subsequent embodiment is explained again.Inspection
The first axis detection echo measured first excludes couplant, the non-defective echo such as dirt, if the height of first axis detection echo
Degree is greater than the axial distance-amplitude curve obtained in advance, then the corresponding bellows position existing defects of first axis detection echo,
If axial distance-amplitude curve that the height of first axis detection echo is less than and obtains in advance, first axis detect echo
Defect is not present in corresponding bellows position.
The bellows detection method that the second embodiment of the present disclosure provides detects the defect of bellows by axial and circumferential,
The effect of the complete detection of ripple defective tube is realized, detection defect is accurate.
Referring to Fig. 6, the third embodiment of the present disclosure provides a kind of bellows detection method, the present embodiment is with aforementioned implementation
Based on example, providing a kind of detection effect more preferably scheme, bellows detection method includes:
S11: in bellows axial direction, every the first detecting distance, using the first ultrasonic probe along bellows circumferential direction
One circle of detection, the circumferential detection echo of detection first；
S12: in bellows axial direction, using the second ultrasonic probe along the axially consecutive detection of bellows, detection first
Axial detection echo；
The height of S13: the first circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, determines first week
To the corresponding bellows position existing defects of detection echo；
S14: the height of first axis detection echo is greater than the axial distance-amplitude curve obtained in advance, determines first axle
To the corresponding bellows position existing defects of detection echo；
First ultrasonic probe: being overturn first angle by S15, in detection test block axial direction, every the first detecting distance,
Using the first ultrasonic probe, along bellows, circumferentially detection one is enclosed, the circumferential detection echo of detection second；
Second ultrasonic probe: being overturn second angle by S16, in detection test block axial direction, is visited using the second ultrasonic wave
Head is along the axially consecutive detection of bellows, the axial detection echo of detection second；
The height of S17: the second circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, determines second week
To the corresponding bellows position existing defects of detection echo；
The height of S18: the second axial detection echo is greater than the axial distance-amplitude curve obtained in advance, determines the second axis
To the corresponding bellows position existing defects of detection echo.
In S15, first angle is chosen as 180 degree.First ultrasonic probe overturning first angle is detected again, it can
It prevents the first ultrasonic probe since the ultrasonic wave transmitting angle of transmitting is consistent with the angle of defect, causes not receive detection echo
Error.
In step s 16, second angle is chosen as 180 degree.Second ultrasonic probe overturning second angle is examined again
It surveys, the second ultrasonic probe can be prevented since the ultrasonic wave transmitting angle of transmitting is consistent with the angle of defect, cause not receive inspection
The error of survey time wave.It preferably, when the second ultrasonic probe overturning second angle being detected, and is detection first axis inspection
When survey time wave, the position that the second ultrasonic probe is placed twice is different.If first time is detection the using the second ultrasonic probe
When one axial detection echo, the second ultrasonic probe is the second axis of detection using ultrasonic probe bellows side, second
To when detecting echo, the second ultrasonic probe is in the bellows other side.
The bellows detection method that the third embodiment of the present disclosure provides, flips an angle ultrasonic probe and is examined again
It surveys primary, it is therefore prevented that the ultrasonic wave transmitting angle of ultrasonic probe transmitting is consistent with the angle of defect, causes not receive and detect back
The error of wave, detection defect are accurate.
Referring to Fig. 7, the fourth embodiment of the present disclosure based on previous embodiment, provides a kind of circumferential distance-wave amplitude
Curve and axial distance-amplitude curve acquisition methods, comprising:
S21: being placed on the first ultrasonic probe in detection test block, and the detection test block includes circumferential cutting and axially carves
Slot；
S22: it in detection test block axial direction, is detected at for n × first distance in the circumferential cutting of distance respectively circumferential
The n-th echo of cutting, n are positive integer；
S23: first decibel is subtracted as evaluation line using circumferential the n-th echo of cutting, draws circumferential distance-amplitude curve；
S24: the second ultrasonic probe is placed on the opposite side in detection test block with axial cutting；
S25: axial cutting echo is detected every second distance in detection test block axial direction；
S26: second decibel is subtracted as evaluation line using axial cutting echo, draws axial distance-amplitude curve.
In S21, the first ultrasonic probe, detection test block are consistent with the structure of previous embodiment, in the present embodiment no longer
It is illustrated.
In S22, first distance is 70mm~130mm.In the present embodiment, first distance 100mm.In detection test block
Axial direction, the different distance away from axial cutting, respectively n × first distance detect the n-th echo of circumferential cutting.Tried in detection
The 1st echo of circumferential cutting, circumferential direction are detected in the axial direction of block, the position away from detection test block 100mm, 200mm, 300mm etc. respectively
The 2nd echo of cutting etc..Preferably, ultrasonic probe is placed on the opposite side in detection test block with axial cutting, and makes ultrasonic wave
When probe and axial cutting are located on the same line, the axial cutting echo gain third decibel of detection is examined as axial flaw
Sensitivity is surveyed, the third decibel is 5dB~7dB.
In S23, first decibel is 5dB~7dB, preferably 6dB.6dB is subtracted as evaluation using circumferential the n-th echo of cutting
Line draws circumferential distance-amplitude curve.
In S24, the second ultrasonic probe is placed on the opposite side in detection test block with axial cutting, the second ultrasonic wave
Probe could preferably detect echo.
In S25, second distance is 18mm~22mm, in the present embodiment, second distance 20mm.I.e. in detection test block axis
To direction, every 20mm, primary axial cutting echo just is detected with the second ultrasonic probe；The transmitting of second ultrasonic probe surpasses
Sound wave is encountered axial cutting and is returned, and the second ultrasonic probe can be detected to obtain axial cutting echo.
In S26, second decibel is 5dB~7dB, preferably 6dB.Using axial cutting echo subtract 6dB as evaluation line,
Draw circumferential distance-amplitude curve.
Preferably, before step S21, further includes:
Use spread speed of the first ultrasonic probe detection ultrasonic wave in detection test block.
Spread speed of the ultrasonic wave in detection test block is detected, keeps subsequent judgement defect more acurrate.
Include: using spread speed of the first ultrasonic probe detection ultrasonic wave in detection test block
The first echo of cutting is detected at the circumferential cutting third distance of distance,
The second echo of cutting is detected at distance the 4th distance of circumferential cutting,
Cutting third echo is detected at distance the 5th distance of circumferential cutting,
According to the time of the first echo of cutting of detection, the second echo of cutting and cutting third echo, demarcates ultrasonic wave and exist
Detect the spread speed in test block.
Third distance is 150mm~250mm, preferably 200mm.When detecting the first echo of cutting, preferably in detection test block
Axial direction detects the first echo of cutting at circumferential cutting third distance.
4th distance is 450mm~550mm, preferably 500mm.When detecting the second echo of cutting, preferably in detection test block
Axial direction detects the second echo of cutting at the 4th distance of circumferential cutting.
5th distance is 250mm~350mm, preferably 300mm.When detecting cutting third echo, preferably in detection test block
Axial direction detects cutting third echo at the 5th distance of circumferential cutting.
The position of first ultrasonic probe is it is known that according to the first echo of cutting, the second echo of cutting and cutting of detection
The time of three echoes can determine spread speed of the ultrasonic wave in detection test block.
Above description is only the preferred embodiment of the disclosure and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that the open scope involved in the disclosure, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from design disclosed above, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed in the disclosure
Can technical characteristic replaced mutually and the technical solution that is formed.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of bellows detection method, is used to detect the defect of bellows, which is characterized in that bellows detection method packet
It includes:
In bellows axial direction, every the first detecting distance, using the first ultrasonic probe, along bellows, circumferentially detection one is enclosed,
The circumferential detection echo of detection first；
First axis detection is detected using the second ultrasonic probe along the axially consecutive detection of bellows in bellows axial direction
Echo；
The height of first circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, determines that first circumferentially detects back
The corresponding bellows position existing defects of wave；
The height of first axis detection echo is greater than the axial distance-amplitude curve obtained in advance, determines that first axis detects back
The corresponding bellows position existing defects of wave.
2. bellows detection method according to claim 1, which is characterized in that bellows detection method further include:
First ultrasonic probe is overturn first angle, uses first every the first detecting distance in detection test block axial direction
Ultrasonic probe along bellows, circumferentially enclose by detection one, the circumferential detection echo of detection second；
Second ultrasonic probe is overturn second angle, in detection test block axial direction, using the second ultrasonic probe along ripple
Manage axially consecutive detection, the axial detection echo of detection second；
The height of second circumferential detection echo is greater than the circumferential distance-amplitude curve obtained in advance, determines that second circumferentially detects back
The corresponding bellows position existing defects of wave；
The height of second axial detection echo is greater than the axial distance-amplitude curve obtained in advance, determines that second axially detects back
The corresponding bellows position existing defects of wave.
3. bellows detection method according to claim 1, it is characterised in that:
First ultrasonic probe be single-chip angle probe, the first ultrasonic probe transmitting ultrasonic frequency be 1MHz~
3MHz, the first ultrasonic probe detection faces are cambered surface, and the cambered surface is axial flat at one with the first ultrasonic probe sound beam direction
On face, the radian of the cambered surface is consistent with the cambered surface radian of institute's bellows；
Second ultrasonic probe be single-chip angle probe, the second ultrasonic probe transmitting ultrasonic frequency be 1MHz~
3MHz, the second ultrasonic probe detection faces are cambered surface, and the cambered surface is axial vertical with the second ultrasonic probe sound beam direction, described
The radian of cambered surface is consistent with the cambered surface radian of institute's bellows.
4. bellows detection method according to claim 1, which is characterized in that the circumferential distance-amplitude curve and axis
Include: to the acquisition methods of distance-amplitude curve
First ultrasonic probe is placed in detection test block, the detection test block includes circumferential cutting and axial cutting；
It is respectively to detect circumferential cutting n-th at n × first distance to return in the circumferential cutting distance of distance in detection test block axial direction
Wave, n are positive integer；
First decibel is subtracted as evaluation line using circumferential the n-th echo of cutting, draws circumferential distance-amplitude curve；
Second ultrasonic probe is placed on the opposite side in detection test block with axial cutting；
Axial cutting echo is detected every second distance in detection test block axial direction；
Second decibel is subtracted as evaluation line using axial cutting echo, draws axial distance-amplitude curve.
5. bellows detection method according to claim 4, it is characterised in that: the first distance is 70mm~130mm,
The second distance is 18mm~22mm.
6. bellows detection method according to claim 4, it is characterised in that: described first decibel is 5dB~7dB, institute
Second decibel is stated as 5dB~7dB.
7. bellows detection method according to claim 4, which is characterized in that described that first ultrasonic probe is placed on
It detects in test block, before the detection test block includes circumferential cutting and axial cutting, further includes: examined using the first ultrasonic probe
Survey spread speed of the ultrasonic wave in detection test block.
8. bellows detection method according to claim 7, which is characterized in that described to be detected using the first ultrasonic probe
Ultrasonic wave detection test block on spread speed include:
The first echo of cutting is detected at the circumferential cutting third distance of distance,
The second echo of cutting is detected at distance the 4th distance of circumferential cutting,
Cutting third echo is detected at distance the 5th distance of circumferential cutting,
According to the time of the first echo of cutting of detection, the second echo of cutting and cutting third echo, demarcates ultrasonic wave and detecting
Spread speed in test block.
9. bellows detection method according to claim 7, it is characterised in that: third distance be 150mm~
250mm, the 4th distance is 450mm~550mm, and the 5th distance is 250mm~350mm.
10. bellows detection method according to claim 4, it is characterised in that:
Circumferential the n-th echo of cutting is as circumferential defect detection sensitivity using at 450mm~550mm；
Ultrasonic probe is placed on the opposite side in detection test block with axial cutting, and is located at ultrasonic probe and axial cutting
When on same straight line, the axial cutting echo gain third decibel of detection is as axial flaw detection sensitivity, the third
Decibel is 5dB~7dB.
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