CN205941456U - Detection apparatus for bolt center bottoming hole inner wall crackle - Google Patents
Detection apparatus for bolt center bottoming hole inner wall crackle Download PDFInfo
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- CN205941456U CN205941456U CN201620715958.3U CN201620715958U CN205941456U CN 205941456 U CN205941456 U CN 205941456U CN 201620715958 U CN201620715958 U CN 201620715958U CN 205941456 U CN205941456 U CN 205941456U
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- bottoming hole
- eddy current
- detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 82
- 208000037656 Respiratory Sounds Diseases 0.000 title claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 44
- 210000004534 cecum Anatomy 0.000 claims abstract description 15
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 206010011376 Crepitations Diseases 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000007689 inspection Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The utility model discloses a detection apparatus for bolt center bottoming hole inner wall crackle, the preceding tip of gauge stick is provided with surveys the seat, survey seat external diameter matching screw center bottoming hole internal diameter, the tip shape is coincide with the shape of the central bottoming hole cecum of bolt before surveying the seat, the border of surveying the preceding tip of seat is equipped with arc chamfer, survey the preceding embedded left side of installing of tip of seat, the first vortex probe that right side symmetry set up, the last embedded left side of installing of arc chamfer, the second vortex probe that right side symmetry set up, it is first, second vortex probe point -blank, a crackle for detecting bolt center bottoming hole cecum department, survey and equidistantly embedded on the outer wall of tip before the seat to install four or eight third vortex probes for detect the crackle of bolt center bottoming hole inner wall. The utility model discloses the bolt thermal drop to below 300 DEG C the time, detect, the cycle is short, it is high to detect the precision, is applicable to all kinds of central bottoming holes and for the bolt of blind hole or through -hole, has good application prospect.
Description
Technical field
This utility model is related to crack detection technical field and in particular to a kind of inspection of bolt-center bottoming hole inner surface crackses
Survey device.
Background technology
The supercritical turbine group that certain is introduced technology became current ultra supercritical and sends out because of high thermal efficiency and long time between overhauls(TBO)
The first-selection of group of motors, has very high market share in China.The intermediate pressure main stop valve of this type steam turbine and middle pressure pitch valve gap spiral shell
Bolt selects IN783 high-temperature alloy material, and this material has high intensity and low thermal coefficient of expansion, and is known as high-temperature oxidation resistance, heat
Good stability, but frequently there is bolt fracture in actually used process and shutdown inspection, not only break bolt is large number of,
And assume brittle fracture feature, the only thousand of hour of bolt active time of fracture in part, serious threat unit operation safety there is.
Have now been found that the IN783 crack in bolt of overwhelming majority fracture originate from center bottoming hole inwall, and a great deal of occur in center
Bottoming hole cecum position.Under the present situation, great in order to prevent because of such bolt continuous fracture suddenly in running to lead to
Accident occurs, and needs to shorten round of visits, utilizes scheduled overhaul as far as possible and mediates visiting chance, IN783 bolt-center is added
Hot hole inwall carries out crack detection.Relatively effective method is video-endoscope detection and ultrasound examination at present, both sides
Method is required to bolt and is cooled to can be detected under less than 50 DEG C of normal temperature state, and after unit orderly closedown, and bolt is from 600
DEG C high temperature cooling to 300 DEG C, typically only needs to 2～3 days, and 300 DEG C of cool below speed is very slow, are generally cooled to 50 DEG C of needs
More than 8 days.The downtime of so most of mediation and visiting all can not test.And what video-endoscope check that
Crackle has generally had suitable opening size, and accuracy of detection is low, easy missing inspection.How to design one kind can be under higher temperature conditions
Bolt-center bottoming hole inner surface crackses are carried out with detection means and the method quickly effectively checking, reduces to ultra supercritical machine as far as possible
The impact of group normal work, is current urgent problem.
Utility model content
The purpose of this utility model is to overcome the detection means of existing bolt-center bottoming hole inner surface crackses to exist
The low problem of round of visits length, precision.The detection means of bolt-center bottoming hole inner surface crackses of the present utility model, can be in spiral shell
Bolt drops to less than 300 DEG C, and without until 50 DEG C of room temperature, it is possible to be detected, detection speed is fast, and accuracy of detection is high, inspection
Survey short time limit it is adaptable to the detection of all kinds of bolt-center bottoming hole inner surface crackses, have a good application prospect.
In order to achieve the above object, this utility model be employed technical scheme comprise that：
A kind of detection means of bolt-center bottoming hole inner surface crackses it is characterised in that：Including detection bar, described detection bar
Leading section be provided with detection seat, the diameter of described detection seat is slightly less than the internal diameter of bolt-center bottoming hole, facilitates insertion into bolt
Center bottoming hole, the shape of described detection seat leading section and the cecum mating shapes of bolt-center bottoming hole, described detection seat
Leading section cross sectional shape is V-shaped, and the edge of detection seat leading section is provided with the arc angling being easy to grafting, before described detection seat
Embedded on the V-arrangement face of end left and right symmetrically arranged first eddy current probe, embedded installation on described arc angling are installed
There is left and right symmetrically arranged second eddy current probe, described first eddy current probe, second eddy current are popped one's head in point-blank, be used for
Crackle at detection bolt-center bottoming hole cecum；Embedded at equal intervals it is provided with the described outer wall circumference detecting seat leading section
Four or eight the 3rd eddy current probes, form eddy current array, for detecting the crackle of bolt-center bottoming hole inwall.
The detection means of aforesaid bolt-center bottoming hole inner surface crackses it is characterised in that：The described diameter ratio detecting seat
Little 0.3～the 1mm of internal diameter of bolt-center bottoming hole.
The detection means of aforesaid bolt-center bottoming hole inner surface crackses it is characterised in that：Described detection seat adopts heatproof
Non-conducting material is made, and each eddy current probe is bonded on detection seat using heat-conducting glue is embedded, described detect bar and detects seat
Internal is cavity structure, and the holding wire of each eddy current probe is drawn all from cavity structure.
The detection means of aforesaid bolt-center bottoming hole inner surface crackses it is characterised in that：Described first eddy current probe,
Two eddy current probes, the 3rd eddy current probe all can detect the crackle of 0.5mm and above depth.
The detection means of aforesaid bolt-center bottoming hole inner surface crackses it is characterised in that：Described 3rd eddy current probe exists
It is evenly arranged on the outer wall circumferencial direction detecting seat leading section, forms eddy current array, so that disposable quick detection goes out in bolt
All crackles of heart bottoming hole inwall.
The beneficial effects of the utility model are：The detection means of bolt-center bottoming hole inner surface crackses of the present utility model,
When bolt temperature drops to less than 300 DEG C of high temperature it is possible to quickly be examined to all kinds of bolt-center bottoming hole inner surface crackses
Survey, without the room temperature dropping to less than 50 DEG C when bolt temperature, shorten waiting time of machine halt, detection cycle is short, detection essence
Degree is high, and structure is simple, easy to operate, has a good application prospect.
Brief description
Fig. 1 is the structural representation of the detection means of bolt-center bottoming hole inner surface crackses of the present utility model.
Fig. 2 is the top view of the detection means of bolt-center bottoming hole inner surface crackses of the present utility model.
Fig. 3 is the schematic diagram of detection method step B of bolt-center bottoming hole inner surface crackses of the present utility model.
Fig. 4 is the schematic diagram of detection method step C of bolt-center bottoming hole inner surface crackses of the present utility model.
In accompanying drawing, the implication of labelling is as follows：
1：Detect bar；2：Detect seat；3：Arc angling；4：First eddy current probe；5：Second eddy current is popped one's head in；6：3rd vortex
Probe.
Specific embodiment
Below in conjunction with Figure of description, this utility model is further described.
As shown in Figures 1 and 2, the detection means of bolt-center bottoming hole inner surface crackses of the present utility model, including detection
Bar 1, described detect bar 1 leading section be provided with detection seat 2, detect seat 2 diameter less by 0.3 than bolt-center bottoming hole internal diameter～
1mm, is easy to detection seat 2 and rotates in bolt-center bottoming hole and mobile, and satisfaction had both been easy to detection means insertion bolt-center and has been added
Hot hole, ensures that detection sensitivity, detects shape and the bolt-center bottoming hole cecum mating shapes of seat 2 leading section, this
The detection seat 2 leading section cross sectional shape of utility model is V-shaped, and the edge of detection seat 2 leading section is provided with the arc being easy to grafting
Shape chamfering 3, is to be designed according to usual bolt (the IN786 bolt especially in background technology) center bottoming hole cecum shape
, such as bolt-center bottoming hole cecum geomery changes, then the leading section cross sectional shape detecting seat also should change therewith,
Described detect seat 2 leading section V-arrangement face on embedded left and right symmetrically arranged first eddy current probe 4 is installed, described arc falls
Embedded on angle 3 left and right symmetrically arranged second eddy current probe 5, described first eddy current probe 4, second eddy current probe 5 are installed
Point-blank, for detecting the crackle at bolt-center bottoming hole cecum, on the outer wall circumference of described detection seat 2 leading section
Embedded at equal intervals four or eight the 3rd eddy current probes 6 are installed, form eddy current array, for detecting bolt-center bottoming hole
The crackle of inwall, the 3rd eddy current probe 6 quantity is more, and accuracy of detection is higher.
Described detection seat 2 adopts heatproof non-conducting material, such as temperature resistant plastic, and each eddy current probe adopts heat-conducting glue embedded
It is bonded on detection seat 2, disclosure satisfy that each eddy current probe and detect seat 2 and detect seat 2 and detect the connected mode between bar 1
It is both needed to consider high temperature resistant, detect bar 1 and to detect the inside of seat 2 be cavity structure, the holding wire of each eddy current probe is all tied from cavity
Draw in structure, with low cost, it is easy to produce in batches.
Described first eddy current probe 4, second eddy current probe the 5, the 3rd eddy current probe 6 all can detect 0.5mm and above depth
Crackle, accuracy of detection is high, and the 3rd eddy current probe 6 is evenly arranged on detecting seat leading section outer wall circumferencial direction, composition vortex
Array, so that disposable quick detection goes out all crackles of bolt-center bottoming hole inwall.
The detection method of the detection means based on above-mentioned bolt-center bottoming hole inner surface crackses, comprises the following steps,
Step (A), when bolt temperature to be detected is below 300 DEG C, hand-held detection bar 1 will detect seat 2 quick insertion
Bolt-center bottoming hole to be detected, makes the leading section of detection seat 2 prop up bolt-center bottoming hole cecum；
Step (B) is as shown in figure 3, bar 1 will be detected rotate 180 °, right by the first eddy current probe 4, second eddy current probe 5
Bolt-center bottoming hole cecum position carries out crack detection, if the first eddy current probe 4, second eddy current probe 5 detects in bolt
There is crackle in heart bottoming hole cecum position, and exported detection signal by corresponding holding wire；
Step (C), after completing bolt-center bottoming hole cecum location detection, as shown in figure 4, outwards at the uniform velocity extract detection bar
1, disposable quick detection is carried out to bolt-center bottoming hole inner surface crackses by eddy current array, if eddy current array detects bolt
There is crackle in center bottoming hole inwall, then exported detection signal by corresponding holding wire, wherein, outwards at the uniform velocity extracts detection
Bar 1, the speed extracting detection bar 1 is 100～150mm/S, and this speed ensure that the 3rd eddy current probe 6 heats in the hole to bolt
The detection signal of wall crackle is stablized it is easy to identify.
In sum, the detection means of bolt-center bottoming hole inner surface crackses of the present utility model, in bolt-center heating
When the temperature in hole drops to less than 300 DEG C, need not be when 50 DEG C of room temperature is it is possible to examine to bolt-center bottoming hole inner surface crackses
Survey, detection cycle is short, meet depth 0.5mm and the reliability detection of above depth crackle, accuracy of detection is high it is adaptable to center is heated
Hole is the bolt of blind hole or through hole, and structure is simple, easy to operate, has a good application prospect.
Of the present utility model ultimate principle, principal character and advantage have been shown and described above.The technical staff of the industry
It should be appreciated that this utility model is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally
The principle of utility model, on the premise of without departing from this utility model spirit and scope, this utility model also has various change
And improvement, these changes and improvements both fall within the range of claimed this utility model.This utility model claims scope
By appending claims and its equivalent thereof.
Claims (5)
1. a kind of detection means of bolt-center bottoming hole inner surface crackses it is characterised in that：Including detection bar (1), described detection
The leading section of bar (1) is provided with detection seat (2), and the described diameter detecting seat (2) is slightly less than the internal diameter of bolt-center bottoming hole, just
In insertion bolt-center bottoming hole, the shape of described detection seat (2) leading section and the cecum shape phase of bolt-center bottoming hole
Join, described detection seat (2) leading section cross sectional shape is V-shaped, and detect the edge of seat (2) leading section and be provided with the arc being easy to grafting
Shape chamfering (3), the described V-arrangement face detecting seat (2) leading section embedded is provided with left and right symmetrically arranged first eddy current probe
(4), described arc angling (3) is above embedded is provided with left and right symmetrically arranged second eddy current probe (5), described first vortex
Probe (4), second eddy current pop one's head in (5) point-blank, for detecting the crackle at bolt-center bottoming hole cecum；Described spy
Survey embedded at equal intervals on the outer wall circumference of seat (2) leading section four or eight the 3rd eddy current probes (6) are installed, composition vortex
Array, for detecting the crackle of bolt-center bottoming hole inwall.
2. bolt-center bottoming hole inner surface crackses according to claim 1 detection means it is characterised in that：Described detection
Diameter 0.3～the 1mm less than the internal diameter of bolt-center bottoming hole of seat (2).
3. bolt-center bottoming hole inner surface crackses according to claim 1 detection means it is characterised in that：Described detection
Seat (2) is made using heatproof non-conducting material, and each eddy current probe is bonded in detection seat (2) using heat-conducting glue is embedded, described
Detecting bar (1) and the inside of detection seat (2) is cavity structure, and the holding wire of each eddy current probe is drawn all from cavity structure.
4. bolt-center bottoming hole inner surface crackses according to claim 1 detection means it is characterised in that：Described first
Eddy current probe (4), second eddy current probe (5), the 3rd eddy current probe (6) all can detect the crackle of 0.5mm and above depth.
5. bolt-center bottoming hole inner surface crackses according to claim 1 detection means it is characterised in that：Described 3rd
Eddy current probe (6) is evenly arranged on the outer wall circumferencial direction detecting seat leading section, forms eddy current array, so that disposably quick
Detect all crackles of bolt-center bottoming hole inwall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620715958.3U CN205941456U (en) | 2016-07-07 | 2016-07-07 | Detection apparatus for bolt center bottoming hole inner wall crackle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620715958.3U CN205941456U (en) | 2016-07-07 | 2016-07-07 | Detection apparatus for bolt center bottoming hole inner wall crackle |
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| Publication Number | Publication Date |
|---|---|
| CN205941456U true CN205941456U (en) | 2017-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620715958.3U Active CN205941456U (en) | 2016-07-07 | 2016-07-07 | Detection apparatus for bolt center bottoming hole inner wall crackle |
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| CN (1) | CN205941456U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230049308A (en) * | 2021-10-06 | 2023-04-13 | 대전대학교 산학협력단 | Ultrasonic sensor install structure, installing method and Ultrasonic sensor signal measurement method for estimating ground anchor quality |
-
2016
- 2016-07-07 CN CN201620715958.3U patent/CN205941456U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20230049308A (en) * | 2021-10-06 | 2023-04-13 | 대전대학교 산학협력단 | Ultrasonic sensor install structure, installing method and Ultrasonic sensor signal measurement method for estimating ground anchor quality |
| KR102630927B1 (en) * | 2021-10-06 | 2024-01-30 | 대전대학교 산학협력단 | Ultrasonic sensor install structure, installing method and Ultrasonic sensor signal measurement method for estimating ground anchor quality |
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