CN102636560A - Online pipeline flaw detection device - Google Patents
Online pipeline flaw detection device Download PDFInfo
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- CN102636560A CN102636560A CN2012101407548A CN201210140754A CN102636560A CN 102636560 A CN102636560 A CN 102636560A CN 2012101407548 A CN2012101407548 A CN 2012101407548A CN 201210140754 A CN201210140754 A CN 201210140754A CN 102636560 A CN102636560 A CN 102636560A
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Abstract
The invention discloses an online pipeline flaw detection device, which comprises a magnetizing mechanism, probes and a creeping mechanism; the magnetizing mechanism comprises two groups of ferromagnetism rings, a U-shaped column and a coil; each group of ferromagnetic rings is formed by two semi-circular ferromagnetism parts and two blocks of semi-circular non-magnetic end plates; the two semi-circular ferromagnetism parts are respectively fixed on the inner sides of the two blocks of semi-circular non-magnetic end plates; one end of one block of non-magnetic end plate is hinged with one end of the other one block of non-magnetic end plate, and the other end of the one block of non-magnetic end plate is connected with the other one end of the other block of non-magnetic end plate through a buckle so as to form one group of closed circular ferromagnetism ring; the two groups of ferromagnetic rings are in parallel with each other at a predetermined interval; the U-shaped column is a ferromagnetism material; an opening end of the U-shaped column is respectively connected with outer diameters of the two groups of ferromagnetism rings; the coil winds at the middle part of the U-shaped column and comprises a direct current input end and a direct current output end; the probes are fixedly connected with the ferromagnetism rings; and the creeping mechanism is fixedly connected with the non-magnetic end plates. The online pipeline flaw detection device can detect an online ferromagnetism pipeline in an installation way of buckling and does not need to detach or disconnect the online pipeline.
Description
Technical field
The present invention relates to a kind of online pipeline inspection device.A kind of signal supervisory instrument of more specifically saying so and utilizing the magnetic leakage detection method that the quality of the ferromagnetism of production, processing and erecting stage industry pipe fitting and online oil, chemical industry, boiler industrial pipeline is detected in real time is through detecting to confirm these industrial pipelines safety whether in operational process.
Background technology
Ferromagnetic pipe fitting is used to form oil, chemical industry, boiler industrial pipeline, is in high pressure-bearing, load-bearing and the operation of high torsion state, receives the continuous action of corrosive gas, liquid and solid simultaneously for a long time.If pipeline includes defective, possibly cause major accidents such as pipeline break, leakage, blast and environmental pollution.
On-line industry pipelines such as present oil, chemical industry, boiler generally are after operation in a few years, and regular stop production to overhaul, stop production to overhaul also are to detect or change these pipelines through local sampling.
The flaw detection principle of existing eddy current flaw detec is: ferromagnetic pipe fitting receives the alternating magnetic field magnetization through eddy current flaw detec the time, form eddy current at the metal tube outside surface.When defective such as crackle was arranged in the ferromagnetic pipe fitting, the electric current in eddy current loop received the influence of pipe fitting surface imperfection and changes, and the alternating magnetic field vertical with eddy current also changes, and magnetic test coil is found this variation magnetic field, thereby detected the existence of defective.
The eddy current flaw detec that adopts in the stop production to overhaul exists following not enough:
1, owing to adopts ac magnetization; The vortex flow that forms has kelvin effect; Therefore eddy current only flows in the shallow appearance of ferromagnetic pipeline, and the defective that pipe interior or inwall exist can not influence eddy current, and obviously eddy current flaw detec can only detect the ferromagnetic pipeline external defects.But in fact, the ferromagnetic pipeline inherent vice plays a part crucial for the safety of ferromagnetic pipeline.
2, because the spacing of present EDDY CURRENT equipment and pipeline needs very accurate localization, can not creep automatically along the on-line industry pipeline, thereby can not be to the reliable detection of on-line industry pipeline;
The supersonic detection method of the routine that adopts in the stop production to overhaul is because restrictions such as acoustic interference, couplant and port number can only carry out local sampling Detection, and detection speed are low, omission is serious.
U.S. TUBSCOPE company is a foremost pipe fitting defect-detecting equipment production company, and the pipe fitting checkout equipment of production captures 30% above international market.But because their equipment is specially to the ferromagnetism industry pipe fitting high speed detection in producing and processing; Bulky, weight is heavy; Need be installed in special-purpose pipe production and job shop; Pipeline need be maneuvered into the workshop far on the way from the scene and could detect, can not be to the reliable detection of on-line industry pipeline.
One Chinese patent application number 00254294.3 discloses a kind of steel pipe magnetic leakage detection device, and it is fixed on leakage field probe and magnetizing assembly on the feed track of conveying steel pipe, accomplishes the scanning of outer surface of steel tube by the steel pipe forward travel of spinning.Its weak point is, need drive the steel pipe rotation by the special driving device and advance, and is not suitable for the Non-Destructive Testing of online pipeline.
For the nondestructive examination of online pipeline, be representative with U.S. TUBSCOPE company, can produce a kind of failure detector of creeping along inner cavity of pipe, this failure detector is walked in pipeline under the promotion of airflow or oil, aqueous fluid and is detected a flaw.But the failure detector of in pipeline, walking is easy to jam when running into the pipeline corner, be out of shape or have the silting part, can only carry out line flaw detection to the major diameter conveyance conduit.
In addition, U.S. OEM company can produce the failure detector that the independent outer surface of pipe fittings in a kind of edge moves, and they are fitted in outer surface of pipe fittings with probe earlier, then the circular magnetization coil is enclosed within on the pipe fitting, and the probe on being fitted in pipe fitting moves flaw detection.Because the circular magnetization coil can only be from the pipe fitting termination point casing on pipe fitting, this device can only detect pipe fitting pulling down, can not carry out online detection.
Therefore, also lack reliable detection method and apparatus at present to on-line industry pipelines such as oil, chemical industry, boilers.
Summary of the invention
The technical matters that the present invention will solve provides a kind of failure detector that can on pipeline to be detected, install or unload easily, need not pull down or break off pipeline, is applicable to the quality testing of on-line industry pipeline.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of online pipeline inspection device, comprise magnetizable body, probe and climbing mechanism, and magnetizable body comprises two groups of ferromagnetism annulus, U-shaped post and coil; Every group of ferromagnetism annulus comprises the ferromagnetism part of 2 semi-round ring shapes and the non magnetic end plate of 2 semi-round ring shapes; 2 ferromagnetism parts are separately fixed at the medial surface of 2 non magnetic end plates; One end of 2 non magnetic end plates is hinged, and the other end connects through snap close, makes the relative ferromagnetism annulus that constitutes one group of closed loop of indent of the ferromagnetism part of 2 semi-round ring shapes; Two groups of spacings that the ferromagnetism annulus is arranged in parallel and sets at interval; The U-shaped post is a ferrimagnet, and the opening two ends of U-shaped post are connected with the external diameter of two groups of ferromagnetism annulus respectively, and coil encircling is at U-shaped post middle part, and coil comprises direct current input end and DC output end; Probe is connected with the ferromagnetism annulus; Climbing mechanism is fixedly connected with non magnetic end plate.
As preferably, climbing mechanism comprises initiatively supporting-point roller, passive supporting-point roller and reducing motor; Initiatively supporting-point roller is contained in initiatively on the supporting-point roller support, initiatively the outside of the non magnetic end plate of supporting-point roller support through being bolted to one group of ferromagnetism annulus; Initiatively supporting-point roller is coaxial and driven by reducing motor with reducing motor; Said passive supporting-point roller is contained on the passive supporting-point roller support, and passive supporting-point roller support is through being bolted to the non magnetic end plate outside of another group ferromagnetism annulus.
As preferably, comprise at least 2 said active supporting-point rollers, the angle that the symmetrical center line of 2 adjacent active supporting-point rollers constitutes is less than 180 degree; Comprise at least 2 said passive supporting-point rollers, the angle that the symmetrical center line of 2 adjacent passive supporting-point rollers constitutes is less than 180 degree.
As preferably, initiatively the supporting-point roller installation site is positioned at the top of one group of ferromagnetism annulus; Passive supporting-point roller installation site is positioned at the top of another group ferromagnetism annulus; The U-shaped post is arranged on the below of two groups of ferromagnetism annulus that laterally arrange.
As preferably, probe is connected with non magnetic end plate through the probe strut, and the strut of popping one's head in has elasticity; A plurality of probes circumferentially evenly distribute to constitute along non magnetic end plate and cover the annular linear transducer array in one week.
As preferably, the probe strut comprises long strut and short strut; Along end plate circumferentially evenly distribute alternate with short strut of long strut is fixed on the non magnetic end plate; The probe that is located at long strut head end constitutes double-deck ring shooting with the probe that is located at short strut head end, and the side of adjacent probe is interlaced; Be located at the signal output port employing difference type of attachment of probe with the probe that is located at short strut head end of long strut head end.
As preferably, probe is 4 or 8 or 16.
As preferably, popping one's head in is magneto-dependent sensor.
As preferably, non magnetic end plate is aluminium or engineering plastics.
As preferably, semi-circular ferromagnetism part and U-shaped post are that DT2 or DT3 or DT4 steel or any low carbon steel iron material are processed.
Compared with present technology, the invention has the beneficial effects as follows:
Employing can opening and closing magnetizable body, can be enclosed within on the online pipeline after opening, become after closing up and can radially carry out magnetized two groups of annular ferromagnets a week the online pipeline of ferromagnet.Can be linked on the spool road any one easily, also be easy to unload when running into online pipe diameter and changing or behind when running into pipeline coupling or the pipeline corner of walking.Whole failure detector compact conformation, easy to carry, processing ease need not be pulled down or break off online pipeline and can monitor in real time online pipeline quality, greatly facilitate the safety detection of online pipeline.
Description of drawings
Fig. 1 is the front view (closure state) of the online pipeline inspection device of the present invention embodiment.
Fig. 2 is that the A of Fig. 1 is to cut-open view (closure state).
Fig. 3 is the left view (open mode) of the online pipeline inspection device of the present invention embodiment.
Fig. 4 is the linear transducer array distribution stretch-out view of the online pipeline inspection device of the present invention embodiment.
Fig. 5 is the principle of work synoptic diagram of the online pipeline inspection device of the present invention embodiment.
Among the figure, 1-pipeline, 2-bottom right end plate, the upper right end plate of 3-, 4-left side bottom plate, the upper left end plate of 5-, 6-bottom right magnetic part; The upper right magnetic part of 7-, 8-left side magnetic spare, the upper left magnetic part of 9-, 10-U shape post, 11-coil, the right snap close of 12-, 13-left side snap close; 14-is supporting-point roller initiatively, 15-supporting-point roller frame, 16-reducing motor, the passive supporting-point roller of 17-, 18-supporting-point roller frame, the short strut of 19-; The 20-magneto-dependent sensor, the long strut of 21-, 22-magneto-dependent sensor, 23-hinge, X-defective, Y-defective.
Embodiment
Present embodiment is a kind of online pipeline inspection device that is used to detect the about 177.8mm industrial pipeline of diameter, and it is made up of magnetizable body, probe and climbing mechanism.
In Fig. 1, magnetizable body comprises left side ferromagnetism annulus, right side ferromagnetism annulus, U-shaped post and coil.
Wherein, two groups of ferromagnetism annulus branches are located at the left and right sides.Bottom right magnetic part 6 that the one group of ferromagnetism annulus in right side is a semi-round ring shape and the upper right magnetic part of semi-round ring shape 7 constitute.Wherein the bottom right magnetic part 6 of lower half circle annular is fixed by bolts to the inboard that is similarly the annular bottom right of lower half circle end plate 2 of processing with aluminium sheet, and the upper right magnetic part 7 of upper semi-circle annular is fixed by bolts to the inboard of the annular upper right end plate of processing with aluminium sheet 3 of same upper semi-circle.Bottom right end plate 2 is hinged through hinge with an end of upper right end plate 3; It is 300mm that the other end connects and composes an external diameter through right snap close 12; Internal diameter is the aluminium sheet annulus of 200mm; And make the bottom right magnetic part 6 that is fixed on the end plate of bottom right be end-to-end with the upper right magnetic part 7 that is fixed on the upper right end plate, indent is relative, the right side ferromagnetism annulus of looping.The external diameter of the right side ferromagnetism annulus that is constituted is 300mm, and internal diameter is 200mm, and the thickness of ferromagnetism annulus is 50mm.
In Fig. 2 and Fig. 3, the one group of ferromagnetism annulus in left side is that the left magnetic spare 8 of semi-round ring shape and the upper left magnetic part 9 of semi-round ring shape constitute.Wherein the left magnetic spare 8 of lower half circle annular is fixed by bolts to the inboard of the left bottom plate of processing with aluminium sheet 4 that is similarly the lower half circle annular, and the upper left magnetic part 9 of upper semi-circle annular is fixed by bolts to the inboard of the upper left end plate of processing with aluminium sheet 5 that is similarly the upper semi-circle annular.Left side bottom plate 4 is hinged through hinge 23 with an end of upper left end plate 5; It is 300mm that the other end connects and composes an external diameter through left snap close 13; Internal diameter is the aluminium sheet annulus of 200mm; And make left magnetic spare 8 that is separately fixed at left bottom plate and the upper left magnetic part 9 that is fixed on the upper left end plate be end-to-end, indent is relative, the left side ferromagnetism annulus of looping.The left side ferromagnetism annulus external diameter that is constituted is 300mm, and internal diameter is 200mm, and the thickness of ferromagnetism annulus is 50mm.
In Fig. 1, about two groups of ferromagnetism annulus be arranged in parallel by spacing 150mm.U-shaped post 10 is a ferrimagnet; The opening two ends of U-shaped post respectively with about the back side of two groups of ferromagnetism annulus external diameters be fixedly connected; Coil 11 is looped around U-shaped post middle part, and coil 11 has direct current input end and DC output end, and the direct current input end is connected with direct current with DC output end.
Initiatively form by supporting-point rollers, 2 passive supporting-point rollers and reducing motor by 2 for climbing mechanism.
The active supporting-point roller 14 that 2 diameters are 25mm is fixed on the lateral surface of upper right end plate 3 through supporting-point roller frame 15; The central angle that the center line of 2 active supporting-point rollers constitutes is 90 degree; Initiatively supporting-point roller 14 and the 375VA/220V that is installed in upper right end plate 3 outsides, no-load voltage ratio are 13: 1 16 coaxial connections of reducing motor, promptly drive initiatively supporting-point rollers 14 rotations by reducing motor 16.Equally, the passive supporting-point roller 17 that 2 diameters are 25mm is fixed on the lateral surface of upper left end plate 5 through supporting-point roller frame 18, and the central angle that 2 adjacent passive supporting-point roller center lines constitute is 90 degree (Fig. 3).
8 probes of present embodiment have adopted 8 magneto-dependent sensors.8 magneto-dependent sensors are fixedly mounted on respectively on the left side end plate of being made up of upper left end plate 5 and left bottom plate 4 along circumferentially even distribution through strut.Wherein, magneto-dependent sensor 20 is fixed on the head end of short strut 19, and the tail end of short strut 19 is fixed on the inboard of upper left end plate 5; Magneto-dependent sensor 22 is fixed on the head end of long strut 21, and the tail end of long strut 21 is fixed on the inboard of left bottom plate 4; Short strut has elasticity with long strut because of spring is housed, and it makes the magneto-dependent sensor of its head end can be close to the outside surface of pipeline to be detected 1 through radial elastic pressure.As shown in Figure 4; Because short strut is spaced with long strut; 8 magneto-dependent sensors that are installed in short strut and long strut head end respectively promptly form the bilayer spread pattern that staggers; And the side of adjacent magneto-dependent sensor is interlaced, thereby constitutes linear transducer array with seamless coverage mode in one week of pipe surface to be detected.
Short strut also can be processed with the rubber-like material with long strut, as processing with elastic copper sheet, even can make with engineering plastics.
For eliminating the influence of the correlation noise that is caused by environmental disturbances and pipe surface, the signal output port of 8 magneto-dependent sensors has adopted the difference type of attachment.Specifically as shown in Figure 4; The probe that numbering is respectively 1,2,3,4 long strut head end is alternately with numbering the probe that is respectively 5,6,7,8 short strut head end; To number 1 long probe is connected with numbering 5 short probes; Equally, will number 2 long probes and numbering 6 short probes, numbering 3 long probes and numbering 7 short probes, numbering 4 long probes and number 8 weak points and pop one's head in and be connected respectively, the output signal after the connection can be offset the correlation noise Z that environmental disturbances and pipe surface cause
iInfluence, only keep unrelated signal.Like long sensor 's number 1 be: U with the output signal of lacking after sensor 's number 5 is connected
1+ Z
1-(U
5+ Z
5)=U
1-U
5, U wherein
1-U
5Represent No. 1 probe of diverse location and the unrelated signal of No. 5 probe collections, and correlated noise signal Z
1-Z
5=0.
Through above-mentioned difference ways of connecting, in its formed flaw indication, the noise accumulation that can friction, corrosion and the bump of pipe surface be produced is eliminated, and has improved flaw indication/jam-to-signal greatly.Improve the reliability of testing result thus.
The detection signal of 8 magneto-dependent sensors output can observe the flaw indication of tested pipeline after through signal amplifier in oscillograph, also can be connected with computing machine through conventional A/D card, carries out the observation of flaw indication at computer display.
Even running when making the work of whole failure detector, on integral layout, initiatively the installation site of supporting-point roller 14 is positioned at the upper outside of right side ferromagnetism annulus; The installation site of passive supporting-point roller 17 is positioned at the upper outside of left side ferromagnetism annulus; U-shaped post 10 and coil 11 are installed in the below of two groups of ferromagnetism annulus that laterally arrange.When said structure made present embodiment work, initiatively supporting-point roller 14, passive supporting-point roller 17 contacted with pipe surface above pipeline 1 to be detected, and heavier U-shaped post 10 and coil 11 are positioned at the below of pipeline 1.Because whole center of gravity is lower, can be more steady when whole failure detector moves.
Above-mentioned U-shaped post 10 with the method for attachment of ferromagnetism annulus is: at first require the external diameter junction cambered surface of following ferromagnetism annulus of both ends open place end face and the left and right sides of U-shaped post 10 smooth, curvature is consistent.Then from descending the inboard radial aperture of ferromagnetism semicircular ring; The end face correspondence at U type post both ends open place is provided with screw simultaneously; Bolt is passed down the ferromagnetism semicircular ring from following ferromagnetism semicircular ring inboard, and bolt head stretches out from the outside, with set screwhole spiro bonding on the U type post cambered surface.
Semicircle ferromagnetism part and U-shaped post can be processed by DT2 or DT3 or DT4 steel or any low carbon steel iron material material.
As shown in Figure 5, the principle of work of present embodiment is following:
Be fastened on the spool road after earlier two groups of ferromagnetism annulus of failure detector being opened; Because the downside cambered surface of bottom right magnetic part 6, left magnetic spare 8 is connected with the two ends of ferromagnetic U-shaped post 10 respectively; And on U-shaped post 10, be wound with coil 11; When coil 11 feeding DCs are flowed; The magnetic line of force that coil 11 generates generates a magnetic field through duct wall, right side ferromagnetism annulus between left side ferromagnetism annulus, the two groups of ferromagnetism annulus successively, and with the tube wall magnetization of the online pipeline of centre.Refraction effect can take place when the defect interface of magnetic field through this segment pipe wall; The magnetic field at defective X and defective Y place is refracted to the outer wall of pipeline; Form defect magnetic flux leakage field so that caught, and produce and send this flaw indication by the linear transducer array scanning of forming by magneto-dependent sensor.The magnetic line of force that is generated by coil 11 returns the U-shaped post through left side ferromagnetism annulus and right side ferromagnetism annulus and forms the closed-loop path.
When failure detector when pipeline moves, according to above principle online pipeline is magnetized piecemeal, when running into the online pipeline of different-diameter or running into box cupling or advance to the pipeline corner and can take off failure detector, leave online pipeline.The ceoncentrically wound coil magnetizing apparatus of having avoided other employings to be enclosed within on the pipeline must split off the deficiency that pipeline just can take off.
Present embodiment adopts the outer climbing mechanism of pipeline to creep mobile along the industrial pipeline outer wall; And can regulate magnetic field intensity fully magnetizes online ferromagnetic pipeline to be detected; Make inside and outside wall of pipeline and inherent vice produce defective magnetic field, form the signal of having or not of reflection defective and serious grade simultaneously with these defective magnetic fields of magneto-dependent sensor scanning at the outside surface of pipeline.
In sum, the present embodiment compact conformation owing to adopt retractable structure, can load and unload on pipeline to be detected easily.Need not dismantle or break off pipeline during use, time saving and energy saving, the corresponding raising of work efficiency has also been saved construction cost simultaneously, has improved economic benefit.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (10)
1. an online pipeline inspection device comprises magnetizable body, probe and climbing mechanism, it is characterized in that: said magnetizable body comprises two groups of ferromagnetism annulus, U-shaped post and coil; Every group of ferromagnetism annulus comprises the ferromagnetism part of 2 semi-round ring shapes and the non magnetic end plate of 2 semi-round ring shapes; Said 2 ferromagnetism parts are separately fixed at the medial surface of 2 non magnetic end plates; One end of 2 non magnetic end plates is hinged, and the other end connects through snap close, makes the relative ferromagnetism annulus that constitutes one group of closed loop of indent of the ferromagnetism part of 2 semi-round ring shapes; The spacing that said two groups of ferromagnetism annulus are arranged in parallel and set at interval; Said U-shaped post is a ferrimagnet, and the opening two ends of U-shaped post are connected with the external diameter of two groups of ferromagnetism annulus respectively, and said coil encircling is at U-shaped post middle part, and coil comprises direct current input end and DC output end; Said probe is fixedly connected with the ferromagnetism annulus; Said climbing mechanism is fixedly connected with non magnetic end plate.
2. online pipeline inspection device according to claim 1 is characterized in that: said climbing mechanism comprises initiatively supporting-point roller, passive supporting-point roller and reducing motor; Said active supporting-point roller is contained in initiatively on the supporting-point roller support, initiatively the outside of the non magnetic end plate of supporting-point roller support through being bolted to one group of ferromagnetism annulus; Initiatively supporting-point roller is coaxial and driven by reducing motor with reducing motor; Said passive supporting-point roller is contained on the passive supporting-point roller support, and passive supporting-point roller support is through being bolted to the non magnetic end plate outside of another group ferromagnetism annulus.
3. online pipeline inspection device according to claim 2 is characterized in that: comprise at least 2 said active supporting-point rollers, the angle that the symmetrical center line of 2 adjacent active supporting-point rollers constitutes is less than 180 degree; Comprise at least 2 said passive supporting-point rollers, the angle that the symmetrical center line of 2 adjacent passive supporting-point rollers constitutes is less than 180 degree.
4. online pipeline inspection device according to claim 3 is characterized in that: said active supporting-point roller installation site is positioned at the top of one group of ferromagnetism annulus; Said passive supporting-point roller installation site is positioned at the top of another group ferromagnetism annulus; Said U-shaped post is arranged on the below of two groups of ferromagnetism annulus that laterally arrange.
5. online pipeline inspection device according to claim 1 is characterized in that: said probe is connected with non magnetic end plate through the probe strut, and the probe strut has elasticity; A plurality of said probes circumferentially evenly distribute to constitute along non magnetic end plate and cover the annular linear transducer array in one week.
6. online pipeline inspection device according to claim 5 is characterized in that: said probe strut comprises long strut and short strut; Along end plate circumferentially evenly distribute alternate with short strut of long strut is fixed on the non magnetic end plate; The probe that is located at long strut head end constitutes double-deck ring shooting with the probe that is located at short strut head end, and the side of adjacent probe is interlaced; Be located at the signal output port employing difference type of attachment of probe with the probe that is located at short strut head end of long strut head end.
7. online pipeline inspection device according to claim 6 is characterized in that: described probe is 4 or 8 or 16.
8. online pipeline inspection device according to claim 7 is characterized in that: said probe is a magneto-dependent sensor.
9. according to any one described online pipeline inspection device of claim 1-6, it is characterized in that: said probe is a magneto-dependent sensor.
10. according to any one described online pipeline inspection device of claim 1-8, it is characterized in that: said non magnetic end plate is aluminium or engineering plastics; Said semi-circular ferromagnetism part and U-shaped post are that DT2 or DT3 or DT4 steel or any low carbon steel iron material are processed.
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| CN102854241A (en) * | 2012-09-09 | 2013-01-02 | 合肥中大检测技术有限公司 | Axial magnetization device suitable for steel pipe short dead zone transverse defect high-speed detection |
| CN102854241B (en) * | 2012-09-09 | 2015-12-09 | 合肥中大检测技术有限公司 | Be suitable for the axial magnetized device of steel pipe short dead zone transverse defect high speed detection |
| CN104062399B (en) * | 2013-03-19 | 2016-02-10 | 中国石油天然气股份有限公司 | Pipeline joint anticorrosion layer the cannot-harm-detection device |
| CN104062399A (en) * | 2013-03-19 | 2014-09-24 | 中国石油天然气股份有限公司 | Nondestructive testing apparatus for pipeline joint anticorrosive coating |
| CN103219128A (en) * | 2013-03-20 | 2013-07-24 | 华中科技大学 | Through type permanent magnetizer and magnetic flux leakage testing probe formed by permanent magnetizer |
| CN103219128B (en) * | 2013-03-20 | 2015-07-01 | 华中科技大学 | Through type permanent magnetizer and magnetic flux leakage testing probe formed by permanent magnetizer |
| CN104407045B (en) * | 2014-12-15 | 2017-08-25 | 重庆交通大学 | The device and method of seizure bridge cable fracture of wire based on metal magnetic memory technique |
| CN104407045A (en) * | 2014-12-15 | 2015-03-11 | 重庆交通大学 | Device and method for catching broken wire of bridge dragline based on metal magnetic memory technique |
| CN106855557A (en) * | 2015-12-09 | 2017-06-16 | 中国石油天然气股份有限公司 | A kind of test device for testing interior detection sensor |
| CN107270558A (en) * | 2017-06-19 | 2017-10-20 | 湖南大学 | A kind of solar light-heat power-generation vacuum heat collection pipe and its detecting system and method |
| CN107271551A (en) * | 2017-07-19 | 2017-10-20 | 天津市首通工程检测技术有限公司 | A kind of pipe detection magnetic force creeper-traveler |
| CN108333252A (en) * | 2018-02-07 | 2018-07-27 | 河南科技大学 | A kind of wire rope flaw detection system and its magnetic leakage signal detection device |
| CN111720754A (en) * | 2020-07-02 | 2020-09-29 | 中国地震局工程力学研究所 | Gas pipeline leak source detection device |
| CN111720754B (en) * | 2020-07-02 | 2022-02-11 | 中国地震局工程力学研究所 | Gas pipeline leak source detection device |
| CN112858467A (en) * | 2021-04-09 | 2021-05-28 | 中国石油大学(华东) | Rotating electromagnetic field pipeline crack detection probe and detection system in any direction |
| CN114295336A (en) * | 2021-11-12 | 2022-04-08 | 国网宁夏电力有限公司吴忠供电公司 | Nondestructive testing method for annular automatic fitting suspension arm advancing through crawler |
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