CN108802182A - The generator guard ring detection method of inner surface wave is encouraged based on graze - Google Patents
The generator guard ring detection method of inner surface wave is encouraged based on graze Download PDFInfo
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- CN108802182A CN108802182A CN201810612894.8A CN201810612894A CN108802182A CN 108802182 A CN108802182 A CN 108802182A CN 201810612894 A CN201810612894 A CN 201810612894A CN 108802182 A CN108802182 A CN 108802182A
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- retaining ring
- wave
- surface wave
- defect
- wall
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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
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The present invention relates to a kind of generator guard ring detection methods encouraging inner surface wave based on graze.Include the following steps：With the probe of phased-array ultrasonic defectoscope surface wave is motivated in retaining ring inner wall to be measured by way of sound wave glancing incidence, and make the surface wave in retaining ring inner wall circumference to propagation, back wave is generated when the surface wave encounters defect, the back wave is received by energy converter and is converted into electronic signal and carries out record either real-time display comes out and determines defect on the retaining ring to be measured according to the image of record result or real-time display.This method not only carries out image recording detection to defect, and accuracy is high, while while detecting need to only choose several points on retaining ring circumference and carry out axial direction scannings and can be realized to 100% scanning of retaining ring inner wall, and detection efficiency greatly improves.
Description
Technical field
The present invention relates to a kind of generator guard ring detection methods encouraging inner surface wave based on graze.
Background technology
Generator guard ring plays fixed function to rotor tip winding, is the important component of generator amature.Generator
Retaining ring in the process of running, subjects the effect of centrifugal stress, bending stress and close-fitting combined stress, due to stress corrosion and fatigue
Etc. reasons be easy inner wall generate micro-crack such as cannot with the increase of running time, generated micro-crack will gradually extend
The presence of crackle is detected in time, and when expanding to a certain critical value, expansion rate can aggravate suddenly, eventually lead to great
Accident.Therefore, there is particularly important meaning in the detection of retaining ring inner surface cracks.
Currently, generator guard ring inner wall detects generally use routine A type pulse ultrasonic wave detection devices, when detection, mainly leads to
It crosses the equipment shear wave that sends out of probe or longitudinal wave is directed to retaining ring inner wall, will produce reflection when direct wave encountering crackle the defects of
Wave, back wave are received by probe and are converted into pulse signal, to identified；Such differentiation, record etc. to detecting defect
The equal Shortcomings of aspect, and needs 100% of popping one's head in cover retaining ring outer wall and just can guarantee that inner wall is all arrived by scanning, examine effect
Rate is relatively low.
Invention content
The object of the present invention is to provide a kind of accuracy height, the detection efficiencies also high hair that inner surface wave is encouraged based on graze
Motor retaining ring detection method.
A kind of generator guard ring detection method being encouraged inner surface wave based on graze, is particular in that, including as follows
Step：With the probe of phased-array ultrasonic defectoscope surface is motivated in retaining ring inner wall to be measured by way of sound wave glancing incidence
Wave, and the surface wave is made, to propagation, back wave to be generated when the surface wave encounters defect in retaining ring inner wall circumference, by the reflection
Wave is received by energy converter and is converted into electronic signal and carried out record either real-time display comes out according to record result or reality
When the image that shows determine the defect on the retaining ring to be measured.
The present invention uses a kind of new characterization processes method, i.e., is motivated in retaining ring inner wall by way of sound wave glancing incidence
Surface wave, surface wave generate back wave (as shown in Fig. 1) in retaining ring inner wall circumference to defect is encountered when propagating, and back wave is changed
Energy device reception is converted into electronic signal, realizes that the detection to defect and record, this method not only carry out image recording inspection to defect
Several points progress axial scannings need to be only chosen when surveying, accuracy height, while detecting on retaining ring circumference to can be realized to retaining ring inner wall
100% scanning, detection efficiency greatly improve.
Description of the drawings
Attached drawing 1 is the principle of the present invention schematic diagram；
Attached drawing 2 is the testing result schematic diagram of the embodiment of the present invention 1, and right part abscissa is that A sweep wave amplitude is high in figure
Percentage is spent, ordinate is A sweep horizontal distance.
Specific implementation mode
The generator guard ring detection method of inner surface wave is encouraged based on graze the present invention provides a kind of, including is walked as follows
Suddenly：Surface wave is motivated in retaining ring inner wall to be measured by way of sound wave glancing incidence with the probe of phased-array ultrasonic defectoscope,
The surface wave retaining ring inner wall circumference to propagate when encounter defect generate back wave, by the back wave by energy converter receive and
Electronic signal is converted into carry out record either real-time display comes out and determines retaining ring according to record result or the image of real-time display
On defect.Be the principle of the present invention schematic diagram as shown in Figure 1, Fig. 1 include ultrasonic phase array pop one's head in 1, shear wave fan sweeping retouch 2,
Shear wave sound ray graze inner wall 3, inner wall surface wave 4, inner surface cracks 5.
Embodiment 1：
1, instrument configuration：
The selection of phased array probe frequency, voussoir and host will take into account decaying and resolution ratio.Phased array devices should have fan
It sweeps and sweeps Display on the same screen function with A, the minimum repetition rate of equipment is not more than 1000Hz, and maximum shows that sound path range is not less than 450mm,
Phased array probe frequency is not more than 5MHz, and probe effective area is not less than 70mm2, and array element length is not less than 8mm.The present invention selects
The ultrasonic phased array analysis system in 128 channels, transmitting burst pulse excitation effective aperture are the phased array probe of 64 array elements, probe
Centre frequency be about 5MHz, equipment repetition rate 1000Hz.
2, test block：
The shelling ring material of the whole circle scaled off on the retaining ring material object that certain domestic retaining ring specialist manufacturers produces has been adopted in test block,
SpecificationWall thickness 75mm, material 18Mn18Cr, either specification or material with true generator
Retaining ring is consistent, and ensure that the reliability of test result.Meanwhile 18Mn18Cr materials due to high intensity, it is non magnetic with
And excellent stress corrosion resistant characteristic, in-service, the newly-built substantially all use of Turbo-generator Set of current country 300MW or more
The material manufacture, thus use it that there is very strong representativeness as test material.Retaining ring test block is carved with 10 × 10 wherein
Keyway and 0.5mm depths, the defect cutting simulating crack defect of 10mm long, the feasibility for verifying the detection method.
3, detection method is verified：
In order to verify the feasibility of this method, a 10mm long, the defect of 1mm depths are machined in generator guard ring test block
Cutting simulating crack defect, if the defect can be detected successfully, demonstrate this method to the detectability of tiny flaw and
Validity.
It when experiment, will pop one's head in, sweep and examine device, encoder and host and connect, then phased array devices host is focused
Rule is arranged, in retaining ring test block surface daubing coupling agent so that circumferentially coupling is good on retaining ring for probe, prevents probe and retaining ring
There are air gaps for outer wall, ensure the transmissivity of sound wave, so that the sound wave that phased array emits is incident to inside retaining ring well, reach
Retaining ring inner wall；Probe is positioned over the position away from cutting about 500mm sound path distances, the i.e. maximum sound path of equipment according to circumferential mode
Range position ensures that the characterization processes pop one's head in maximum sound path position still with the ability for finding 1mm cutting defects in distance.
It is circumferentially moved forward and backward phased array probe, while adjusting device yield value in maximum sound path position, is adjusted
When should consider that sound wave that phased array devices are sent out has enough energy, while there is suitable signal-to-noise ratio；Final experiment is set
The standby 1mm cutting defects successfully found on the position of sound path distance about 500mm.
4, scanning mode：
In practical scanning, after the completion of host and probe are configured, are adjusted according to the method described above, in retaining ring circumference side
To phased array probe, along retaining ring axial direction mobile probe when scanning, from the scanning of retaining ring one end to the other end, in scanning retaining ring
Wall circumferential defect；Then probe orientation of turning round ensures that the crack defect of different directions can along same path negative direction scanning
Accurately detected；After the completion of the position scanning, the rayleigh waves inspection distance that probe is 0.9 times according to spacing (is considered
10% scanning Duplication) it is placed into second and sweeps not good enough, above-mentioned scanning step is repeated, until retaining ring inner wall whole scanning is complete
It is standby.Observation device screen is paid attention to during scanning, when surface wave encounters defect, the echo of fault location reflection will be by phased array
Probe receives, and is converted into electronic signal and shows on the display screen, while can record the length of defect, entire scanning scope
Interior situation has host record and stores, convenient for having access to analysis later.
5, conclusion：
1) it is feasible that retaining ring underbead crack is detected in such a way that shear wave glancing incidence encourages inner surface wave, and the current country is still
Have not seen the introduction about this method, which has certain researching value.
Although 2) shelling ring material is austenitic stainless steel, coarse grains, and thickness is larger can cause incident sound inside retaining ring
The decaying of wave, but these adverse effects are overcome using phased array devices, surface wave is successfully motivated, and surface wave is in retaining ring
Decaying is smaller when portion propagates, and may be implemented to detect over long distances；
3) the controllable phased-array ultrasonic detection technique of acoustic beam angle is to realize to form glancing incidence in retaining ring inner wall and encourage
Go out the more reliable technological means of surface wave；
4) compared with conventional ultrasound detection, it is all outer that retaining ring need not be covered using probe when this experiment detection method
100% detection to its inner surface can be realized in surface, and detection efficiency greatly improves；
5) retaining ring inner and outer surfaces are all smoother, regular, for forging the more complex components of shapes such as threeway, outside
Surface is hexagon etc., but inner surface is smooth, regular cylinder, and conventional ultrasound detection is difficult that inner surface crackle carries out
Detection, coherent detection can be completed using the method for the invention, have apparent technical advantage in this respect.
Claims (1)
1. a kind of generator guard ring detection method encouraging inner surface wave based on graze, which is characterized in that include the following steps：With
The probe of phased-array ultrasonic defectoscope motivates surface wave by way of sound wave glancing incidence in retaining ring inner wall to be measured, and makes
The surface wave, to propagation, generates back wave, by the back wave by changing in retaining ring inner wall circumference when the surface wave encounters defect
Can device receive and be converted into electronic signal and carry out record either real-time display comes out according to record result or real-time display
Image determines the defect on the retaining ring to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810612894.8A CN108802182A (en) | 2018-06-14 | 2018-06-14 | The generator guard ring detection method of inner surface wave is encouraged based on graze |
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| CN201810612894.8A CN108802182A (en) | 2018-06-14 | 2018-06-14 | The generator guard ring detection method of inner surface wave is encouraged based on graze |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208388A (en) * | 2019-04-26 | 2019-09-06 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of method that tube interior axial flaw quickly detects |
| CN112461925A (en) * | 2020-11-11 | 2021-03-09 | 西安热工研究院有限公司 | Method for generating maximum intensity ultrasonic surface wave based on phased array technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110208388A (en) * | 2019-04-26 | 2019-09-06 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of method that tube interior axial flaw quickly detects |
| CN112461925A (en) * | 2020-11-11 | 2021-03-09 | 西安热工研究院有限公司 | Method for generating maximum intensity ultrasonic surface wave based on phased array technology |
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Application publication date: 20181113 |
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