CN109100418B - Scanning device for pulse eddy current detection of non-ferromagnetic pipeline - Google Patents
Scanning device for pulse eddy current detection of non-ferromagnetic pipeline Download PDFInfo
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- CN109100418B CN109100418B CN201810954927.7A CN201810954927A CN109100418B CN 109100418 B CN109100418 B CN 109100418B CN 201810954927 A CN201810954927 A CN 201810954927A CN 109100418 B CN109100418 B CN 109100418B
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- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 40
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 210000000078 claw Anatomy 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 13
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000005291 magnetic effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9006—Details, e.g. in the structure or functioning of sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention belongs to the technical field of pipeline nondestructive testing equipment, and particularly discloses a scanning device for pulse eddy current testing of a non-ferromagnetic pipeline. The scanning device comprises a bottom plate and is characterized by comprising a pulse eddy current detection probe mechanism, a plurality of clamping mechanisms and a driving unit for driving the scanning device to move on a pipeline, wherein the pulse eddy current detection probe mechanism is arranged below the bottom plate and comprises a probe, a screw rod and springs, the clamping mechanisms are symmetrically arranged on two sides of the bottom plate, one end of each clamping jaw is connected with the torsion spring through a jaw rotating shaft, the protruding part of each torsion spring is pressed on the corresponding clamping jaw and is used for pressing the corresponding clamping jaw to provide clamping force of the corresponding clamping jaw to the pipeline, and the other end of each clamping jaw is further provided with a pulley. The invention can realize the detection of the defect of the reduced wall thickness of the non-ferromagnetic large-diameter metal pipeline, can adapt to pipelines with various specifications, and realizes the multipath detection of the pipeline by combining two scanning paths on the pipeline and under the pipeline.
Description
Technical Field
The invention belongs to the technical field of pipeline nondestructive testing equipment, and particularly relates to a scanning device for pulse eddy current testing of a non-ferromagnetic pipeline.
Background
The pipeline is widely applied to various engineering and industrial devices such as oil gas, chemical industry, electric power, heating and the like, and has extremely important effects on industrial production and daily life. The pipeline is influenced by high temperature, high pressure and complex external environment in long-term use, cracks are easy to generate, and meanwhile, the inner wall of the pipeline is subjected to scouring and corrosion action of a medium, so that large-area corrosion and wall thickness reduction are generated. If effective monitoring or maintenance is not performed, the defects are rapidly expanded under high pressure, so that the pipe wall is cracked, the leakage and even explosion of the pipeline are caused, huge economic loss is caused, and the environment is greatly polluted and endangered. The pulse eddy current detection technology has the advantages of no shutdown detection, penetrability of a coating layer and the like, has wide application prospect in pipeline defect detection, has low detection efficiency, and becomes a big bottleneck restricting the development of the technology, so that the development of the portable pulse eddy current rapid scanning device and the improvement of the pulse eddy current detection efficiency have important significance in engineering application.
Chinese patent CN 104502444a discloses a device for scanning defects in a pipeline, which comprises four sets of flexible shaft driving units, a scanning track adjusting structure, a permanent magnet adsorption mechanism and an adjustable probe mechanism. Each set of flexible shaft driving unit consists of a motor, a flexible shaft sleeve, a wheel set and a coupler, the permanent magnet adsorption mechanism consists of two permanent magnet sets with opposite polarities and an armature, the magnetization direction of the magnets is perpendicular to the axis direction of the pipeline, and the device adopts a circumferential magnetization method and can detect the longitudinal defect of the pipeline; the adjustable flat probe can adapt to scanning of pipelines with various specifications; the device has the advantages of adjustable scanning track, novel transmission mode, compact structure, small volume and light weight, and can be widely applied to defect scanning of pipelines. But the device can be used for detecting the defects of the ferromagnetic pipeline and is not suitable for pulse eddy current detection of the non-ferromagnetic pipeline.
The patent document of Chinese patent CN 101255942B discloses an automatic spraying machine for on-site overhaul of a pipeline, which is used for spraying an anti-corrosion layer after pipeline excavation, is a device for walking around the outer surface of the pipeline, can be suitable for pipelines with various diameters by installing movable frames of annular pipelines at two ends of a walking trolley and arranging clamping wheels with springs on the frames to clamp the pipelines, and has the advantages of huge volume, poor portability and complex installation.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides a scanning device for pulse eddy current detection of a non-ferromagnetic pipeline, which is used for detecting the defects of the wall thickness reduction of the non-ferromagnetic large-diameter metal pipeline by a driving unit arranged above a bottom plate, a pulse eddy current detection probe mechanism arranged below the bottom plate and a plurality of clamping mechanisms symmetrically arranged on two sides of the bottom plate, can adapt to pipelines with various specifications, and realizes multi-path scanning of the pipeline by combining two scanning paths on the pipeline and under the pipeline.
In order to achieve the above object, the invention provides a scanning device for pulse eddy current detection of a non-ferromagnetic pipeline, comprising a bottom plate, and further comprising a pulse eddy current detection probe mechanism, a clamping mechanism and a driving unit for driving the scanning device to move on the pipeline, wherein:
the pulse eddy current detection probe mechanism is arranged below the bottom plate and comprises a probe, a screw rod and a spring, the probe is fixedly connected with the bottom plate through the screw rod and the nut, the spring is sleeved on the screw rod and is clamped between the probe and the bottom plate, and the height position of the probe is adjusted by tightening or loosening the nut;
the clamping mechanism is a plurality of and symmetrical arrangement in the bottom plate both sides, the clamping mechanism includes jack catch, jack catch pivot and torsional spring, the one end of jack catch pass through the jack catch pivot with the torsional spring is connected, just the protruding portion of torsional spring is pressed and is in be used for compressing tightly on the jack catch provides the clamping force of jack catch to the pipeline, the other end of jack catch is equipped with the pulley, thereby realizes the sliding connection of clamping mechanism and pipeline is in order to reduce friction.
Further, the scanning device comprises a plurality of balance weight units symmetrically arranged on two sides of the bottom plate, each balance weight unit comprises a balance weight rod, one end of each balance weight rod is detachably connected with the corresponding balance weight supporting plate, the other end of each balance weight rod is connected with the corresponding hook, and the balance weight supporting plates are fixedly connected with the bottom plate.
Further, the weight unit includes an adjustable weight suspended from the hanger.
Further, the driving unit comprises a motor supporting plate, a right-angle commutator, wheels, a coupler, a speed reducer and a motor, wherein the motor supporting plate is fixed on the bottom plate, the right-angle commutator is fixed below the motor supporting plate, an output shaft of the right-angle commutator is connected with the wheels, an input shaft of the right-angle commutator is connected with the speed reducer through the coupler, and the speed reducer is connected with the motor.
Further, a first dovetail groove is formed in the connection position of the bottom plate and the claw supporting plate, and the claw supporting plate is fixedly arranged in the first dovetail groove.
Further, a second dovetail groove is formed in the connection position of the bottom plate and the motor support plate, and the motor support plate is fixedly arranged in the second dovetail groove.
Further, the bottom plate is made of non-magnetic conductive materials.
In general, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention comprises a pulse eddy current detection probe mechanism, a plurality of clamping mechanisms and a driving unit for driving the scanning device to move on a pipeline, wherein the height position of the probe can be realized by tightening or loosening the nut so as to adapt to the detection requirements of different nonferromagnetic pipelines; meanwhile, the clamping mechanisms are symmetrically arranged on two sides of the bottom plate, one end of each clamping jaw is connected with the torsion spring through the clamping jaw rotating shaft and used for pressing the clamping jaw to provide clamping force of the clamping jaw to the pipeline, and the other end of each clamping jaw is further provided with a pulley, so that sliding connection between the clamping mechanisms and the pipeline is realized, friction is reduced, and the scanning device is not limited by the material of the pipeline or the convex-concave fluctuation condition of the outer surface of the pipeline, and has the advantages of compact structure, small volume and light weight, and can be widely applied to defect detection of the pipeline.
2. The probe is connected with the bottom plate through the screw rod and the nut, the spring is sleeved on the screw rod and is clamped between the probe and the bottom plate, and the height position of the probe is realized by screwing or loosening the nut so as to adapt to detection requirements of different nonferromagnetic pipelines.
3. The invention comprises a plurality of counterweight units symmetrically arranged at two sides of the bottom plate, and for the detection of the upper part of the pipeline, the center of the detection device is lowered by hanging the adjustable counterweight, so that the balance of the detection device is ensured, the multipath detection of the detection device is realized, and the detection precision is improved.
4. The driving unit comprises a motor, a speed reducer, a coupler, a right-angle commutator, wheels and a motor supporting plate, so that the speed and the track of the scanning device moving on the pipeline can be accurately controlled according to the requirements.
5. The clamping mechanism and the counterweight unit are arranged in the dovetail groove of the bottom plate, so that the counterweight unit is easy to assemble and disassemble, two scanning paths of the upper pipeline and the lower pipeline are conveniently realized, and simultaneously, the clamping mechanisms with different sizes are easy to replace, so that the clamping mechanism is suitable for pipelines with more specifications.
Drawings
FIG. 1 is a schematic structural diagram of a scanning device for pulsed eddy current testing of non-ferromagnetic pipes according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a structure of a detection probe according to an embodiment of the present invention;
fig. 3 is a schematic view of a driving unit structure according to an embodiment of the present invention;
FIG. 4 is a schematic view of a clamping mechanism according to an embodiment of the present invention;
fig. 5 is a schematic view of a counterweight unit according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a scanning device for pulsed eddy current testing of non-ferromagnetic pipes according to an embodiment of the present invention operating above the pipes;
fig. 7 is a schematic structural diagram of a scanning device for pulse eddy current detection of a non-ferromagnetic pipeline according to an embodiment of the present invention, working below the pipeline.
Like reference numerals denote like technical features throughout the drawings, in particular: 1-pulse eddy current testing probe mechanism, 2-fixture, 3-bottom plate, 4-drive unit, 5-counter weight unit, 6-pipeline, 7-probe, 8-screw rod, 9-spring, 10-torsional spring, 11-jack catch backup pad, 12-jack catch, 13-pulley, 14-motor, 15-reduction gear, 16-shaft coupling, 17-motor backup pad, 18-right angle steering gear, 19-wheel.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The basic principle of pulse eddy current detection is that a pulse or square wave current signal is introduced into an exciting coil, exciting current generates a changing magnetic field in space, eddy current is induced in a detected member, a primary electromagnetic field directly coupled from the coil and a secondary electromagnetic field generated by the eddy current are overlapped, the latter contains information such as the thickness and defects of the member, induced voltage generated by the secondary magnetic field is measured by a detecting coil, and the measured signal is analyzed to obtain the information of the detected member.
As shown in fig. 1, the scanning device for pulsed eddy current inspection of a non-ferromagnetic pipeline comprises a pulsed eddy current inspection probe mechanism 1, a clamping mechanism 2, a driving unit 4 and a counterweight unit 5. Wherein, when the scanning device is positioned above the pipeline, the scanning device hangs the balance of the balance weight holding device through the balance weight unit 5; when the scanning device is positioned below the pipeline, the balance weight unit 5 is removed and kept balanced by the dead weight. The scanning device is tightly pressed on the outer surface of the pipeline 6 by providing enough clamping force through the clamping mechanism 2, the driving unit 4 provides power for the scanning device to axially move along the pipeline 6, and the detection probe 1 is used for acquiring the wall thickness information of the pipeline 6, so that the defect detection of the pipeline 6 is realized.
As shown in fig. 6, when the scanning device is located above the pipeline 6 for working detection, the gravity center of the scanning device can be lowered by hanging the counterweight through the counterweight unit 5, and stable crawling of the scanning device is ensured. As shown in fig. 7, when the scanning device is positioned below the pipeline 6 for working detection, the weight unit 5 in the dovetail groove on the bottom plate 3 is removed, so that the weight of the clothes is overcome by the pressing force provided by the clamping mechanism 2, and the balance is maintained.
As shown in fig. 1 and 2, the pulsed eddy current inspection probe mechanism 1 includes a probe 7, a screw 8, and a spring 9. The pulse eddy current detection probe mechanism 1 is arranged below the bottom plate 3 and connected with the bottom plate 3 through a screw rod 8 and a nut, the spring 9 is sleeved on the screw rod 8 and clamped between the pulse eddy current detection probe mechanism 1 and the bottom plate 3, the height position of the probe 7 is realized by screwing or loosening the nut, and the spring 9 is used for fixing the pulse eddy current detection probe mechanism 1 and buffering vibration of the pulse eddy current detection probe mechanism 1, so that the shock absorption of the pulse eddy current detection probe mechanism 1 is realized.
As shown in fig. 1 and fig. 4, the scanning device comprises a plurality of clamping mechanisms 2 symmetrically arranged on two sides of the pipeline 6, wherein each clamping mechanism 2 comprises a claw 12, a claw supporting plate 11, a torsion spring 10 and a pulley 13, the claw 12 is connected with the torsion spring 10 through a claw rotating shaft, the middle part of the torsion spring is pressed on the claw 12 and used for compressing the claw 12 to provide clamping force of the claw 12, the claw rotating shaft is fixed on the claw supporting plate 11 through a bearing, and the bottom of the claw supporting plate 11 is fixedly connected with the bottom plate 3. When the jaws 12 are twisted outward about the jaw rotational axis, the torsion spring 10 pressed against the jaws 12 generates a torque, thereby providing a clamping force of the jaws 12, thereby achieving gripping of the pipe 6 by the jaw mechanism. The other end of the claw 12 is also provided with a pulley 13, and when the claw mechanism grasps the pipeline 6, the pulley 13 directly pushes against the pipeline 6, so that the friction between the scanning device and the pipeline 6 is sliding friction when the scanning device moves along the pipeline 6, and the friction between the scanning device and the pipeline 6 is reduced.
As shown in fig. 3, the driving unit 4 comprises a motor 14, a speed reducer 15, a coupler 16, a right-angle commutator 18, wheels 19 and a motor supporting plate 17, wherein the motor supporting plate 17 is fixed on the bottom plate 3 in a dovetail groove mode, the right-angle commutator 18 is fixed below the motor supporting plate 17, an output shaft is connected with the wheels 19, the input shaft is connected with the speed reducer 15 through the coupler 16, and the speed reducer is connected with the motor 14. The power of the direct current motor 14 is decelerated through a decelerator 15, transmitted to a right angle commutator 18 through a coupling 16, changed in rotation direction through the right angle commutator 18, and transmitted to wheels 19, so that the scanning device is driven to move outside the pipeline 6.
As shown in fig. 5, the counterweight unit 5 is composed of a counterweight rod 22, a hook 21 and a counterweight supporting plate 20, wherein the counterweight supporting plate 20 is fixed on the bottom plate 3 in a dovetail groove form, the counterweight rod 22 is mounted on the counterweight supporting plate 20 through a screw, and the hook 21 is connected to the bottom end of the counterweight rod through threads.
The working process of the device is as follows: before detection, the scanning device is firstly placed on the outer surface of the pipeline 6, the clamping mechanism 2 is adjusted according to the outer diameter of the pipeline 6, the clamping jaw 12 is pressed against the pipeline 6, then the lifting height of the probe 7 is adjusted through the screw rod 8, and the counterweight is hung below the counterweight unit 5 or the counterweight unit 5 is dismounted according to the scanning path. The motor is provided with a power supply to drive the device to move, and along with the axial movement of the whole device along the pipeline 6, the probe 7 scans wall thickness information below the track and detects signals by the probe, and the defect condition of the inner wall of the pipeline 6 can be obtained by analyzing the signals received in the scanning process of the probe.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. Scanning device for non-ferromagnetic pipeline pulse eddy current testing, including bottom plate (3), its characterized in that still includes pulse eddy current testing probe mechanism (1), fixture (2) and is used for driving scanning device moves on the pipeline drive unit (4), wherein:
the pulse eddy current detection probe mechanism (1) is arranged below the bottom plate (3) and comprises a probe (7), a screw rod (8) and a spring (9), the probe (7) is fixedly connected with the bottom plate (3) through the screw rod (8) and a nut, and the spring (9) is sleeved on the screw rod (8) and clamped between the probe (7) and the bottom plate (3) so as to adjust the height position of the probe (7) by screwing or unscrewing the nut;
the clamping mechanisms (2) are multiple and symmetrically arranged on two sides of the bottom plate (3), the clamping mechanisms (2) comprise clamping jaws (12), clamping jaw rotating shafts and torsion springs (10), one ends of the clamping jaws (12) are connected with the torsion springs (10) through the clamping jaw rotating shafts, protruding parts of the torsion springs (10) are pressed on the clamping jaws (12) and used for compressing the clamping jaws (12) and providing clamping force of the clamping jaws (12) on a pipeline, and pulleys (13) are arranged at the other ends of the clamping jaws (12), so that sliding connection between the clamping mechanisms (2) and the pipeline is achieved, and friction is reduced;
a first dovetail groove is formed in the connection position of the bottom plate (3) and the claw supporting plate (11), and the claw supporting plate is fixedly arranged in the first dovetail groove;
the scanning device comprises a plurality of balance weight units (5) symmetrically arranged on two sides of the bottom plate (3), each balance weight unit (5) comprises a balance weight rod (22), one end of each balance weight rod (22) is detachably connected with a balance weight supporting plate (20), the other end of each balance weight rod is connected with a hook (21), and the balance weight supporting plates (20) are fixedly connected with the bottom plate (3).
2. Scanning device for pulsed eddy current inspection of non-ferromagnetic pipes according to claim 1, characterized in that said counterweight unit (5) comprises an adjustable counterweight suspended on said hanger (21).
3. Scanning device for pulsed eddy current inspection of non-ferromagnetic pipes according to claim 1 or 2, characterized in that said driving unit (4) comprises a motor support plate (17), a right angle commutator (18), wheels (19), a coupling (16), a reducer (15) and a motor (14), said motor support plate (17) being fixed on said base plate (3), said right angle commutator (18) being fixed under said motor support plate (17) and having its output shaft connected to said wheels (19), its input shaft connected to said reducer (15) via said coupling (16), said reducer (15) being connected to said motor (14).
4. Scanning device for pulsed eddy current inspection of non-ferromagnetic pipes according to claim 1 or 2, characterized in that the connection of the base plate (3) and the motor support plate (17) is provided with a second dovetail groove and the motor support plate (17) is fixedly arranged in the second dovetail groove.
5. Scanning device for pulsed eddy current inspection of non-ferromagnetic pipes according to claim 1 or 2, characterized in that the base plate (3) is made of a non-magnetically conductive electrically conductive material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810954927.7A CN109100418B (en) | 2018-08-21 | 2018-08-21 | Scanning device for pulse eddy current detection of non-ferromagnetic pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810954927.7A CN109100418B (en) | 2018-08-21 | 2018-08-21 | Scanning device for pulse eddy current detection of non-ferromagnetic pipeline |
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| CN109100418A CN109100418A (en) | 2018-12-28 |
| CN109100418B true CN109100418B (en) | 2024-03-22 |
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Families Citing this family (4)
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| CN109668057B (en) * | 2019-01-23 | 2020-08-21 | 北京工业大学 | Ground steel pipeline detection scanner with coating layer |
| CN109838697A (en) * | 2019-03-15 | 2019-06-04 | 浙江海洋大学 | A kind of device for oil-gas pipeline leak detection |
| CN112730604B (en) * | 2020-12-04 | 2024-03-26 | 中国特种设备检测研究院 | Pulsed eddy current sensor device for corrosion monitoring of metal pipeline |
| CN113671023B (en) * | 2021-08-25 | 2024-04-09 | 南昌航空大学 | Suspension type double-shaft automatic scanning mechanism for railway vehicle plates and calibration method thereof |
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| CN206761079U (en) * | 2017-04-05 | 2017-12-19 | 湖南机电职业技术学院 | A kind of tourism knapsack hung |
| CN208860801U (en) * | 2018-08-21 | 2019-05-14 | 华中科技大学 | Nonferromagnetic pipeline Pulsed eddy current testing scanning equipment |
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