CN110118825A - A kind of bolt ultrasonic detection method and device - Google Patents
A kind of bolt ultrasonic detection method and device Download PDFInfo
- Publication number
- CN110118825A CN110118825A CN201910484657.2A CN201910484657A CN110118825A CN 110118825 A CN110118825 A CN 110118825A CN 201910484657 A CN201910484657 A CN 201910484657A CN 110118825 A CN110118825 A CN 110118825A
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- sliding
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 239000000523 sample Substances 0.000 claims abstract description 40
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000002604 ultrasonography Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000036544 posture Effects 0.000 description 2
- 241001237728 Precis Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- G01N29/225—Supports, positioning or alignment in moving situation
-
- 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
- G01N2291/0234—Metals, e.g. steel
-
- 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
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- Physics & Mathematics (AREA)
- 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 bolt technical field of nondestructive testing, especially a kind of bolt ultrasonic detection device, including bolt, guiding mechanism is provided on the outside of bolt end head, guiding mechanism includes interior guide rail bracket and outer guide frame, interior guide rail bracket and outer guide frame are circular ring structure, and concentric parallel is distributed, several connecting rods are fixedly installed between interior guide rail bracket and outer guide frame, first guide rail is installed at the top of interior guide rail bracket, the top of outer guide frame is fixedly installed with the second guide rail, the bottom of guiding mechanism is provided with fixed mechanism, sliding equipment is provided at the top of guiding mechanism, the side of sliding equipment is fixedly installed with clamping device, ultrasonic probe is connected on clamping device, ultrasonic probe is located at the top of bolt.The present invention realizes the function of detecting automatically, and data redundancy is good, and detection accuracy is high, the position-adjustable of ultrasonic probe, so that the position controllable precise of ultrasonic probe, improves detection accuracy.
Description
Technical field
The present invention relates to bolt technical field of nondestructive testing more particularly to a kind of bolt ultrasonic detection methods and device.
Background technique
Bolt-connection is one of most common structure connecting mode, be widely used in electricity power, petrochemical industry, railway,
The industries such as ship, machine-building.Due to bolt strained complexity, equal defect risks can be cracked in the long-term use,
In order to ensure that use is safe, need periodically to carry out ultrasound examination to bolt.Currently, being mainly to bolt progress ultrasound examination
Using the longitudinal wave normal probe of single-chip, tilting probe or phased array probe is used, uses corresponding conventional Ultrasound
Wave instrument or phased array detector hold probe with hand and are moved the screw thread position to bolt, screw parts in bolt end face
Carry out ultrasound examination；Currently, mainly being detected by manual checking mode to bolt, still, manual checking mode is deposited
In many disadvantages, first, influenced by manual operation mode, repeatability is not high, and whether the pressure size of hand, probe movement arrive
Position, can all have an impact testing result；The second, manual mode not can guarantee at the uniform velocity moving for probe, to the displays of data and
Storage has an adverse effect；Third, using phased array detection technique when, hand-held phased array transducer not can guarantee motion profile for circle
(probe movement center of track is consistent with the tested bolt end face center of circle), there are deviations for actually detected and default focusing rule, lead
Detection accuracy is caused to reduce；4th, it is difficult to ensure that acoustic beam impinges perpendicularly on region to be checked when using tilting probe, is easy
Cause missing inspection；So needing a kind of high-precision ultrasonic detection device easy to operate.
Summary of the invention
The purpose of the present invention is to solve the disadvantage low with detection accuracy not easy to operate exists in the prior art, and propose
A kind of bolt ultrasonic detection device.
To achieve the goals above, present invention employs following technical solutions:
A kind of bolt ultrasonic detection device, including bolt are designed, is provided with guiding mechanism on the outside of the bolt end head,
The guiding mechanism includes interior guide rail bracket and outer guide frame, and the interior guide rail bracket and outer guide frame are circular ring structure, and with one heart
Parallelly distribute on, is fixedly installed with several connecting rods between the interior guide rail bracket and outer guide frame, the connecting rod is led around interior
Rail gantry, outer guide frame are uniformly distributed, and the first guide rail, the top of the outer guide frame are fixedly installed at the top of the interior guide rail bracket
It is fixedly installed with the second guide rail；
The bottom of the guiding mechanism is provided with fixed mechanism, and the fixed mechanism includes toroidal frame, the toroidal frame position
Several support plates are fixedly installed at the top of the outside of bolt, the toroidal frame, the support plate is uniform around toroidal frame
Distribution, the top of the support plate are fixedly connected with outer guide frame, and several first are provided on the lateral wall of the toroidal frame
Bolt, the side wall of the first bolt-through toroidal frame, and be threadedly coupled with toroidal frame, if being provided on the inside of the toroidal frame
Curved splint corresponding with the first bolt is done, the outside of the curved splint is fixedly connected with corresponding first bolt；
Sliding equipment is provided at the top of the guiding mechanism, the sliding equipment includes sliding seat, in the sliding seat
The both ends in portion are fixedly installed with dual-axle motor, and the output end of the dual-axle motor is fixedly connected with shaft, and the shaft runs through
The side wall of sliding seat, and be rotatablely connected with sliding seat, the both ends of the sliding seat have been respectively fixedly connected with interior pulley and outer pulley,
The interior pulley is connected on the first guide rail, and is slidably connected with the first guide rail, and the outer pulley is connected on the second guide rail, and
It is slidably connected with the second guide rail；The side of the sliding equipment is fixedly installed with clamping device, is connected on the clamping device
Ultrasonic probe, the ultrasonic probe are located at the top of bolt.
Preferably, the clamping device includes sliding cross bar, and the sliding cross bar runs through sliding seat, and slides with sliding seat
Connection, is provided with the second bolt at the top of the sliding seat, the roof of the second bolt-through sliding seat, and with sliding cross bar
It is threadedly coupled, one end of the sliding cross bar is fixedly connected with clamping seat, and the clamping seat is located at the inside of sliding seat, the card
The inside of joint chair is connected with sliding block, and the sliding block is slidably connected with clamping seat, and the screw top of the clamping seat is connected with third
Bolt, the roof of the third bolt-through clamping seat, and be fixedly connected with a slide block, folder is fixedly installed on the outside of the sliding block
Frame is held, the both ends of the holding frame are threaded with the 4th bolt, and the both ends of the inside of the holding frame are provided with clamp pad
Block, the clamping cushion block are fixedly connected with corresponding 4th bolt, the ultrasonic probe be connected to two clamping cushion blocks it
Between.
Preferably, the clamping seat is internally provided with the sliding slot to match with sliding block, and the sliding block is connected in sliding slot.
Preferably, the holding frame is U-shaped structure.
Preferably, the interior pulley is identical with the shape and structure of outer pulley.
The present invention also provides a kind of bolt ultrasonic detection methods, include the following steps；
Step 1: ultrasonic probe being mounted between two clamping cushion blocks, the second bolt and third bolt tune are then passed through
The position of whole ultrasonic probe, so that ultrasonic probe is located at the surface of bolt to be detected；
Step 2: ultrasonic excitation signals being emitted to ultrasonic probe by setpoint frequency by control tester, so that ultrasonic
Wave, which is popped one's head in, emits ultrasonic signal to bolt to be detected；
Step 3: starting dual-axle motor, so that interior pulley and outer pulley are slided around the first guide rail, the second guide rail, thus
Ultrasonic probe is at the uniform velocity moved around bolt to be measured；
Step 4: tester calculates the knot for emitting ultrasonic signal from ultrasonic signal transmitted wave by internal electronic element
The beam moment to through bolt to be detected generate bottom wave at the beginning of between ultrasonic signal gross energy, the total energy that will be calculated
Amount and preset gross energy are compared with crack in bolt corresponding data, and obtaining bolt to be detected according to comparison result whether there is
Crackle, and crackle situation when there are crackle.
A kind of bolt ultrasonic detection device proposed by the present invention, beneficial effect are:
1, the design of sliding equipment and guiding mechanism, effect are, by dual-axle motor can make sliding seat around
Bolt at the uniform velocity moves, and on the one hand realizes the function of detecting automatically, and on the other hand can make motion profile is a regular circle shapes,
Data redundancy is good, and detection accuracy is high；
2, the design of clamping device, effect are, pass through the second bolt and the adjustable ultrasonic probe of third bolt
Position, this guarantees the controllable precises of ultrasonic probe posture and initial position, improve detection accuracy.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of bolt ultrasonic detection device proposed by the present invention；
Fig. 2 is a kind of structural schematic diagram of the guiding mechanism of bolt ultrasonic detection device proposed by the present invention；
Fig. 3 is a kind of structural schematic diagram of the fixed mechanism of bolt ultrasonic detection device proposed by the present invention；
Fig. 4 is a kind of structural schematic diagram of the clamping device of bolt ultrasonic detection device proposed by the present invention.
In figure: bolt 1, guiding mechanism 2, interior guide rail bracket 21, outer guide frame 22, connecting rod 23, the first guide rail 24, second are led
It is rail 25, fixed mechanism 3, toroidal frame 31, support plate 32, the first bolt 33, curved splint 34, sliding equipment 4, sliding seat 41, double
Spindle motor 42, interior pulley 44, outer pulley 45, clamping device 5, sliding cross bar 51, the second bolt 52, clamping seat 53, is slided shaft 43
Block 54, holding frame 56, the 4th bolt 57, clamps cushion block 58, ultrasonic probe 6 at third bolt 55.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1-4, a kind of bolt ultrasonic detection device, including bolt 1, bolt are provided with guiding on the outside of 1 top
Mechanism 2, guiding mechanism 2 include interior guide rail bracket 21 and outer guide frame 22, and interior guide rail bracket 21 and outer guide frame 22 are circular ring structure,
And concentric parallel is distributed, and several connecting rods 23 are fixedly installed between interior guide rail bracket 21 and outer guide frame 22, connecting rod 23 is surround
In guide rail bracket 21, outer guide frame 22 be uniformly distributed, the top of interior guide rail bracket 21 is fixedly installed with the first guide rail 24, outer guide frame
22 top is fixedly installed with the second guide rail 25；
The bottom of guiding mechanism 2 is provided with fixed mechanism 3, and fixed mechanism 3 includes toroidal frame 31, and toroidal frame 31 is located at bolt
1 outside, the top of toroidal frame 31 are fixedly installed with several support plates 32, and support plate 32 is uniformly distributed around toroidal frame 31,
The top of support plate 32 is fixedly connected with outer guide frame 22, and several first bolts 33 are provided on the lateral wall of toroidal frame 31,
First bolt 33 runs through the side wall of toroidal frame 31, and is threadedly coupled with toroidal frame 31, the inside of toroidal frame 31 be provided with it is several and
The corresponding curved splint 34 of first bolt 33, the outside of curved splint 34 is fixedly connected with corresponding first bolt 33；
The top of guiding mechanism 2 is provided with sliding equipment 4, and sliding equipment 4 includes sliding seat 41, and two inside sliding seat 41
End is fixedly installed with dual-axle motor 42, and the output end of dual-axle motor 42 is fixedly connected with shaft 43, and shaft 43 runs through sliding seat
41 side wall, and be rotatablely connected with sliding seat 41, the both ends of sliding seat 41 have been respectively fixedly connected with interior pulley 44 and outer pulley 45,
Interior pulley 44 is identical with the shape and structure of outer pulley 45, and interior pulley 44 is connected on the first guide rail 24, and sliding with the first guide rail 24
Dynamic connection, outer pulley 45 is connected on the second guide rail 25, and is slidably connected with the second guide rail 25；Sliding equipment 4 and guiding mechanism 2
Design, effect is, sliding seat 41 can be made at the uniform velocity to move around bolt 1 by dual-axle motor 42, on the one hand realize
The function of automatic detection, on the other hand can make motion profile is a regular circle shapes, data redundancy is good, detection accuracy
It is high.
The side of sliding equipment 4 is fixedly installed with clamping device 5, and ultrasonic probe 6 is connected on clamping device 5, ultrasound
Wave probe 6 be located at bolt 1 top, clamping device 5 include sliding cross bar 51, sliding cross bar 51 run through sliding seat 41, and with cunning
Dynamic seat 41 is slidably connected, and the top of sliding seat 41 is provided with the second bolt 52, and the second bolt 52 runs through the roof of sliding seat 41, and
It is threadedly coupled with sliding cross bar 51, one end of sliding cross bar 51 is fixedly connected with clamping seat 53, and clamping seat 53 is located at sliding seat 41
Inside, the inside of clamping seat 53 is connected with sliding block 54, and clamping seat 53 is internally provided with the sliding slot to match with sliding block 54, sliding
Block 54 is connected in sliding slot, and is slidably connected with clamping seat 53.
The screw top of clamping seat 53 is connected with third bolt 55, third bolt 55 through clamping seat 53 roof, and with
Sliding block 54 is fixedly connected, and the outside of sliding block 54 is fixedly installed with holding frame 56, and holding frame 56 is U-shaped structure, and the two of holding frame 56
End is threaded with the 4th bolt 57, and the both ends of the inside of holding frame 56, which are provided with, clamps cushion block 58, clamps cushion block 58 and phase
Corresponding 4th bolt 57 is fixedly connected, and ultrasonic probe 6 is connected between two clamping cushion blocks 58, the design of clamping device 5,
Effect is that, by the position of the second bolt 52 and the adjustable ultrasonic probe 6 of third bolt 55, this guarantees ultrasonic waves
It pops one's head in the controllable precise of 6 postures and initial position, improves detection accuracy.
The present invention also provides a kind of bolt ultrasonic detection methods, include the following steps；
Step 1: ultrasonic probe being mounted between two clamping cushion blocks, the second bolt and third bolt tune are then passed through
The position of whole ultrasonic probe, so that ultrasonic probe is located at the surface of bolt to be detected；
Step 2: ultrasonic excitation signals being emitted to ultrasonic probe by setpoint frequency by control tester, so that ultrasonic
Wave, which is popped one's head in, emits ultrasonic signal to bolt to be detected；
Step 3: starting dual-axle motor, so that interior pulley and outer pulley are slided around the first guide rail, the second guide rail, thus
Ultrasonic probe is at the uniform velocity moved around bolt to be measured；
Step 4: tester calculates the knot for emitting ultrasonic signal from ultrasonic signal transmitted wave by internal electronic element
The beam moment to through bolt to be detected generate bottom wave at the beginning of between ultrasonic signal gross energy, the total energy that will be calculated
Amount and preset gross energy are compared with crack in bolt corresponding data, and obtaining bolt to be detected according to comparison result whether there is
Crackle, and crackle situation when there are crackle.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of bolt ultrasonic detection device, including bolt (1), which is characterized in that the outside on bolt (1) top is arranged
Have guiding mechanism (2), the guiding mechanism (2) includes interior guide rail bracket (21) and outer guide frame (22), the interior guide rail bracket (21)
It is circular ring structure with outer guide frame (22), and concentric parallel is distributed, between the interior guide rail bracket (21) and outer guide frame (22)
It is fixedly installed with several connecting rods (23), the connecting rod (23) is uniformly divided around interior guide rail bracket (21), outer guide frame (22)
Cloth is fixedly installed with the first guide rail (24) at the top of the interior guide rail bracket (21), the fixed peace in the top of the outer guide frame (22)
Equipped with the second guide rail (25)；
The bottom of the guiding mechanism (2) is provided with fixed mechanism (3), and the fixed mechanism (3) includes toroidal frame (31), described
Toroidal frame (31) is located at the outside of bolt (1), is fixedly installed with several support plates (32) at the top of the toroidal frame (31), described
Support plate (32) is uniformly distributed around toroidal frame (31), and the top of the support plate (32), which is fixed with outer guide frame (22), to be connected
It connects, several first bolts (33) is provided on the lateral wall of the toroidal frame (31), first bolt (33) runs through toroidal frame
(31) side wall, and be threadedly coupled with toroidal frame (31), several and the first bolt is provided on the inside of the toroidal frame (31)
(33) corresponding curved splint (34), the outside of the curved splint (34) is fixed with corresponding first bolt (33) to be connected
It connects；
It is provided with sliding equipment (4) at the top of the guiding mechanism (2), the sliding equipment (4) includes sliding seat (41), described
The internal both ends of sliding seat (41) are fixedly installed with dual-axle motor (42), and the output end of the dual-axle motor (42) is fixedly connected
Have shaft (43), the shaft (43) runs through the side wall of sliding seat (41), and is rotatablely connected with sliding seat (41), the sliding seat
(41) both ends have been respectively fixedly connected with interior pulley (44) and outer pulley (45), and the interior pulley (44) is connected to the first guide rail
(24) it on, and is slidably connected with the first guide rail (24), the outer pulley (45) is connected on the second guide rail (25), and leads with second
Rail (25) is slidably connected；The side of the sliding equipment (4) is fixedly installed with clamping device (5), is blocked on the clamping device (5)
It is connected to ultrasonic probe (6), the ultrasonic probe (6) is located at the top of bolt (1).
2. a kind of bolt ultrasonic detection device according to claim 1, which is characterized in that clamping device (5) packet
Sliding cross bar (51) is included, the sliding cross bar (51) runs through sliding seat (41), and is slidably connected with sliding seat (41), the sliding
Seat (41) at the top of be provided with the second bolt (52), second bolt (52) run through sliding seat (41) roof, and with sliding
Cross bar (51) is threadedly coupled, and one end of sliding cross bar (51) is fixedly connected with clamping seat (53), clamping seat (53) position
It is connected with sliding block (54) in the inside of the inside of sliding seat (41), clamping seat (53), the sliding block (54) and clamping seat
(53) it is slidably connected, the screw top of clamping seat (53) is connected with third bolt (55), and the third bolt (55) is run through
It is clamped the roof of seat (53), and is fixedly connected with sliding block (54), is fixedly installed with holding frame (56) on the outside of the sliding block (54),
The both ends of the holding frame (56) are threaded with the 4th bolt (57), and the both ends of the inside of the holding frame (56) are provided with
It clamps cushion block (58), the clamping cushion block (58) is fixedly connected with corresponding 4th bolt (57), the ultrasonic probe (6)
It is connected between two clamping cushion blocks (58).
3. a kind of bolt ultrasonic detection device according to claim 2, which is characterized in that described to be clamped the interior of seat (53)
Portion is provided with the sliding slot to match with sliding block (54), and the sliding block (54) is connected in sliding slot.
4. a kind of bolt ultrasonic detection device according to claim 2, which is characterized in that the holding frame (56) is U
Type structure.
5. a kind of bolt ultrasonic detection device according to claim 1, which is characterized in that the interior pulley (44) and outer
The shape and structure of pulley (45) is identical.
6. a kind of bolt ultrasonic detection method described in -5 according to claim 1, which is characterized in that include the following steps；
Step 1: ultrasonic probe is mounted between two clamping cushion blocks, it is then super by the second bolt and the adjustment of third bolt
The position of sonic probe, so that ultrasonic probe is located at the surface of bolt to be detected；
Step 2: ultrasonic excitation signals being emitted to ultrasonic probe by setpoint frequency by control tester, so that ultrasonic wave is visited
Head emits ultrasonic signal to bolt to be detected；
Step 3: starting dual-axle motor, so that interior pulley and outer pulley are slided around the first guide rail, the second guide rail, so that
Ultrasonic probe can at the uniform velocity be moved around bolt to be measured；
Step 4: tester by internal electronic element calculate from ultrasonic signal transmitted wave emit ultrasonic signal at the end of
Carve to the gross energy for generating ultrasonic signal between at the beginning of the wave of bottom through bolt to be detected, by the gross energy being calculated and
Preset gross energy is compared with crack in bolt corresponding data, obtains bolt to be detected with the presence or absence of splitting according to comparison result
Line, and crackle situation when there are crackle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910484657.2A CN110118825A (en) | 2019-06-05 | 2019-06-05 | A kind of bolt ultrasonic detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910484657.2A CN110118825A (en) | 2019-06-05 | 2019-06-05 | A kind of bolt ultrasonic detection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110118825A true CN110118825A (en) | 2019-08-13 |
Family
ID=67523769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910484657.2A Pending CN110118825A (en) | 2019-06-05 | 2019-06-05 | A kind of bolt ultrasonic detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110118825A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111307953A (en) * | 2020-03-31 | 2020-06-19 | 奥瑞视（北京）科技有限公司 | Ultrasonic detection device and detection method for large-scale revolving body |
| CN111948212A (en) * | 2020-06-18 | 2020-11-17 | 宁国丰彩电子科技有限公司 | Transformer skeleton detection device |
| CN112710734A (en) * | 2020-12-09 | 2021-04-27 | 东莞理工学院 | Bolt damage ultrasonic detection method and system based on GOLD codes |
| CN113720737A (en) * | 2021-08-30 | 2021-11-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Grain size nondestructive testing device and method for nickel-based high-temperature fastening bolt |
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| CN112710734A (en) * | 2020-12-09 | 2021-04-27 | 东莞理工学院 | Bolt damage ultrasonic detection method and system based on GOLD codes |
| CN112710734B (en) * | 2020-12-09 | 2022-10-25 | 东莞理工学院 | Bolt damage ultrasonic detection method and system based on GOLD codes |
| CN113720737A (en) * | 2021-08-30 | 2021-11-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Grain size nondestructive testing device and method for nickel-based high-temperature fastening bolt |
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