CN205372090U - Online permanent magnetism detection device of portable pressure -bearing industrial pipeline - Google Patents
Online permanent magnetism detection device of portable pressure -bearing industrial pipeline Download PDFInfo
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- CN205372090U CN205372090U CN201620054493.1U CN201620054493U CN205372090U CN 205372090 U CN205372090 U CN 205372090U CN 201620054493 U CN201620054493 U CN 201620054493U CN 205372090 U CN205372090 U CN 205372090U
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- permanent magnet
- pipeline
- magnetization
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Abstract
The utility model discloses an online permanent magnetism detection device of portable pressure -bearing industrial pipeline, including magnetization mechanism and detection agency, magnetization mechanism includes a magnetic conduction handle, two blocks of permanent magnet, two magnetization end terminals, the both ends of magnetic conduction handle are connected with the upside of two blocks of permanent magnet respectively, and the downside and a magnetization end terminal of every block of permanent magnet are connected, the detection agency is including probe and tunnel magnetism resistance bridge array, the both ends of probe are connected with the inboard of the magnetization end terminal that is located magnetic conduction handle both ends, and the probe is located the intermediate position of two magnetization end terminals, the laminating of probe bottom is detected the pipeline outer wall, and the inner chamber of probe is equipped with tunnel magnetism resistance bridge array. The utility model discloses simple structure, easily make, low, safe and reliable, energy -concerving and environment -protective are rateed to operational failure.
Description
Technical field
This utility model relates to a kind of portable pressure-bearing industrial pipeline permanent magnetic detection device online.
Background technology
Online pressure-bearing industrial pipeline is in high temperature, high pressure, high capacity and is subject under the environment such as corrosion to run continuously, if pipeline interior existing defects, heavy corrosion, can cause leakage, explosion, even cause disaster.Highly reliable detecting instrument, complete detection pipeline quality condition everywhere, it is ensured that the safe operation of pressure-bearing industrial pipeline must be adopted.
Prior art and deficiency thereof:
At present, generally adopt eddy current and the big conventional method of ultrasound detection two that online pressure-bearing industrial pipeline is detected in the world.
1, EDDY CURRENT is to adopt ac magnetization device that pipeline is magnetized.Owing to metallic conduit is electric conductor, pipe surface circumferencial direction equivalence can become a closed-loop path enclosed, so ac magnetization field can produce induced current on the surface of pipeline, sense of current rotates along the circumferencial direction of pipe surface, just as the whirlpool of a circle circle, the induced current in this case produced is referred to as eddy current.Eddy current can cause eddy current to change by the defective locations place of conductor, thus causing the change of induced current in detection sensor.But the Kelvin effect due to eddy current, these eddy current can only be formed at the outer surface of pipeline, the profound defect of pipeline will not cause eddy current to change, so EDDY CURRENT can only find pipeline material surface and the defect on nearly surface, it has been found that pipeline is not profound and inner wall defect.
2, ultrasound detection is electricity consumption pulse excitation ultrasonic beam, and the lens of probe are by sound beam focusing, by the medium couples such as oil, water to tube wall, by sound wave transmitting in duct wall and refraction situation detect defect in duct wall with or without and position.On the one hand that online pipeline coating media everywhere is highly difficult, the performance of medium couples sound wave is very big on testing result impact on the other hand, it is also difficult to online boiler tubing complete detection；Outside it, the sound wave severe jamming ultrasonic signal that pipeline inner high voltage steam or current are formed, it is unfavorable for extraction and the identification of ultrasonic signal.Further, the acoustic beam after focusing also can only transmit in the local of pipeline, so ultrasound detection is a kind of method to the detection of pipeline regional area, it is impossible to each point defect of complete detection pipeline.
Above-mentioned the deficiencies in the prior art can be summarized as and can only carry out outer surface detection or local detection, and couplant impact detects the problems such as performance.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of portable pressure-bearing industrial pipeline permanent magnetic detection device online.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is, portable pressure-bearing industrial pipeline is permanent magnetic detection device online, including magnetizable body and detection agency；
Magnetizable body includes a magnetic conduction handle (1), two pieces of permanent Magnet (2), two pieces of magnetization pole shoes (3)；The two ends of magnetic conduction handle are connected with the upper end of two blocks of permanent Magnet respectively, and the lower end of every block of permanent Magnet is connected with one piece of magnetization pole shoe again；
Detection agency includes probe (12) and tunnel magneto resistance bridge array (13)；The two ends of probe are connected with the inner side of the magnetization pole shoe (3) being positioned at magnetic conduction handle two ends, and probe is positioned at the centre position of two pieces of magnetization pole shoes；The outer wall of the detected pipeline of probe bottom laminating, the inner chamber of probe is equipped with tunnel magneto resistance bridge array (13).
As preferably, the polarity of the two blocks of permanent Magnet being positioned at magnetic conduction handle (1) two ends connects by the form of series connection so that the magnetic of two blocks of permanent Magnet is that superposition strengthens, it is achieved the abundant magnetization to duct wall.
As preferably, magnetizable body also includes the magnetic short circuited ring (4) with magnetic property；Two magnetic short circuited ring ring sets respectively are at the two ends of magnetic conduction handle (1)；
Magnetic short circuited ring can along magnetic conduction handle slide downward and be enclosed within be positioned at magnetic conduction handle two ends permanent Magnet (2) around so that the magnetic field that permanent Magnet one pole sends is directly coupled to perseverance another pole of Magnet by magnetic short circuited ring；Or
Magnetic short circuited ring also can along magnetic conduction handle upward sliding and be located away the permanent Magnet (2) at magnetic conduction handle two ends around so that perseverance another pole of Magnet is coupled to by tested duct wall in the magnetic field that permanent Magnet one pole sends, it is achieved the magnetization to tested duct wall.
As preferably, magnetizable body also includes roller (5)；Two groups of rollers are separately fixed at the outside of magnetization pole shoe (3) so that magnetization pole shoe (3) and detected pipeline keep the distance that sets and can along pipe surface axially or circumference mobile.
As preferably, detection agency also includes fixed support (7), probe position-limited rack (9), probe standing screw (10), probe pressuring spring (11)；The both sides of probe position-limited rack (9) are moved in the chute of fixed support (7) both sides, bottom, probe standing screw (10) top with the screw on fixed support (7) to threaded, bottom is connected through the through hole on probe position-limited rack with the probe (12) being positioned at below probe position-limited rack, probe pressuring spring (11) is contained between fixed support and probe position-limited rack and is enclosed within probe standing screw, and probe (12) is oppressed and be fitted in the outer wall of detected pipeline by probe pressuring spring.
As preferably, the cross section of magnetic conduction handle (1) and the cross section of two pieces of permanent Magnet (2) are the circle with same diameter.
As preferably, tunnel magneto resistance bridge array (13) is the many groups electric bridge being made up of the tunnel magneto resistance of many, and it is further preferred that, electric bridge is Wheatstone bridge.
The beneficial effects of the utility model are:
1, permanent Magnet and portable magnetic circuit is adopted to form light magnetizator, pipeline is carried out steady magnetic field magnetization, pipeline external surface can be excited, the defect of any position in inner-walls of duct and wall can be excited again in pipeline external surface space to form defect magnetic field, meet the reliable of on-line industry pipeline and complete detection requirement；
2, power supply magnetic field and any detection couplant need not be executed outward during detection, both save power supply and testing cost, ensure that again testing result is reliable and stable；
3, the sound wave that the steady magnetic field of permanent Magnet is not formed by the high steam in online pipeline or current disturbs, and both can pipeline parts be detected, and the pipeline in on-line operation can be implemented Site Detection again；
4, adopting many group tunnel magneto resistance electric bridges to constitute probe, when not having defect in pipeline, pipeline external surface zero defect magnetic field, each electric bridge all balances, it does not have signal exports；When in pipeline defective time, pipeline external surface formed defect magnetic field, always have electric bridge unbalance, export flaw indication；Such detecting device both can along pipeline external surface mobile detection rapidly, it is also possible to stops at any place of pipeline and realizes static detection.
5, whole detecting device, small volume and less weight, it is simple to operation, has the advantage such as simple in construction, easily fabricated, low, safe and reliable, the energy-conserving and environment-protective of operation troubles rate simultaneously.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, this utility model is described in further detail.
Fig. 1 is the structural representation of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Fig. 2 is the magnetic field schematic diagram (magnetized state) of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Fig. 3 is the magnetic field schematic diagram (unmagnetized state) of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Fig. 4 is the detection agency schematic diagram of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Fig. 5 is the sonde configuration schematic diagram of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Fig. 6 is the wheatstone bridge circuits figure of the portable pressure-bearing industrial pipeline of this utility model permanent magnetic detection device embodiment online.
Labelling in figure, 1-magnetic conduction handle, 2-perseverance Magnet, 3-magnetizes pole shoe, 4-magnetic short circuited ring, 5-trundle, 6-pipeline, 7-probe fixing support, 8-sliding guide groove, 9-pops one's head in position-limited rack, and 10-pops one's head in standing screw, and 11-pops one's head in pressuring spring, 12-pops one's head in, 13-tunnel magneto resistance bridge array, 14-defect, 15-defect magnetic field.
Detailed description of the invention
Fig. 1 is a kind of portable pressure-bearing industrial pipeline permanent magnetic detection device online, forms by Portable magnetic mechanism with to detection agency two parts of pipeline.
Portable magnetic mechanism is U-shaped, by 1 U-shaped for connecting permanent Magnet and there are 3, two pieces of magnetic short circuited rings 4 of magnetization pole shoe of circular permanent 2, the two pieces of high magnetic conductions of Magnet of 1, two pieces of magnetic conduction handle of high magnetic conduction and two groups of rollers 5 form.
The magnetic conduction handle of U-shaped is made up of technical pure iron staff, can couple together to strengthen magnetic potential intensity by the magnetic field of two blocks of permanent Magnet 2 by polarity series system, and the handle use being convenient for carrying is used as in the stage casing of U-shaped simultaneously.
There is installation circular hole in the center of circle of two blocks of circular permanent Magnet 2, the upper end of each block of circular permanent Magnet is respectively installed to through the non magnetic bolt installing circular hole by one the two ends of U-shaped magnetic conduction handle 1, again through this root non magnetic bolt, the lower end of circular permanent Magnet is separately mounted to the upper end of two pieces of magnetization pole shoes.The outer surface of detected pipeline 6 is pressed close in the lower end of magnetization pole shoe 3, and similar to the curvature on the surface of pipeline, is coupled on duct wall in the magnetic field that permanent Magnet 2 sends.Above-mentioned installation must connect by the form of the polarity series connection of permanent Magnet, it is ensured that the magnetic of two blocks of circular permanent Magnet is that superposition strengthens, it is achieved the abundant magnetization to duct wall.Press close to the outside at detected pipeline place at two pieces of magnetization pole shoes 3 and be also respectively provided with the trundle 5 of two V-arrangements, its effect avoids on the one hand magnetizing assembly and will not be adsorbed on detected pipeline 6 to be difficult to move or mention, be also convenient for operator promotes whole detecting device to move along pipeline by magnetic conduction handle 1 simultaneously, and pipeline is detected.
Also being cased with a magnetic short circuited ring 4 made of iron at the two ends of circular permanent Magnet 2, magnetic short circuited ring 4 can be enclosed within the two ends of circular permanent Magnet 2, or is pulled away from the two ends of circular permanent Magnet 2 on magnetic conduction handle.When magnetic short circuited ring 4 moves the upper end of magnetic conduction handle to, the magnetic field of permanent Magnet is coupled on duct wall by magnetizing pole shoe, belongs to pipeline magnetization and detection state (Fig. 2)；When magnetic short circuited ring fit to the both sides of permanent Magnet 2, the magnetic field that permanent Magnet one pole sends is directly coupled to another pole by magnetic short circuited ring, only seldom magnetic field is coupled on duct wall, it is easy to easily be extracted by detecting device leave pipeline, belongs to the unmagnetized to pipeline and non-detection status (Fig. 3).
In the diagram, detection agency is made up of probe fixing support 7, probe position-limited rack 9, probe standing screw 10, probe pressuring spring 11, probe 12.Probe fixing support 7 two ends of non-ferromagnetic material arrange two fixing holes, are separately fixed between two magnetization pole shoes 3 by screw, it is ensured that probe 12 is in midpoint the best magnetization and the optimum detection position of two magnetization pole shoes.Probe fixing support 7 inner vertical direction arranges sliding guide groove 8, limits within it by probe position-limited rack 9, can only slide up and down along sliding guide groove, it is impossible to swings or rotates.The probe position-limited rack 9 of non-ferromagnetic material is in H font, centre is provided with through hole allows a probe standing screw 10 pass, probe standing screw 10 upper end is connected with the screw on probe fixing support 7, probe 12 is installed in its lower end, probe pressuring spring 11 in intermediate sleeve, turn probe fixing support and apply downward active force to probe position-limited rack 9, it is ensured that be arranged on the probe 12 below probe position-limited rack 9 and can reliably be fitted in the outer surface of detected pipeline 6.Opening on the downside of probe position-limited rack 9 mates with probe plate shape, is limited within it by probe 12, can only move up and down, it is impossible to swing or rotate, it is ensured that probe can reliably be fitted in the outer surface of detected pipeline.
As shown in Figure 5, probe 12 is the arc-shaped flaky workpiece that nonmagnetic substance is processed into, its inner arc curvature and detected pipeline cylindrical curvature match to ensure to pop one's head in detected pipeline of fitting along pipe circumference direction, it is processed into rectangle groove from the arcuately direction, middle part of arc-shaped flaky workpiece outer arc, channel bottom and inner arcuate surface leave 1mm left and right thickness, arrange detecting element in groove.
It is tunnel magneto resistance bridge array 13 at the internal detecting element arranged of probe.The present embodiment forms Wheatstone bridge particularly as by tunnel magneto resistance (TMR), then is constituted bridge array by multiple Wheatstone bridges.
Tunnel magneto resistance element is subject to variation magnetic field effect, and linear change can occur resistance (conductance).The Wheatstone bridge that tunnel magneto resistance is constituted is owing to being subject to the effect in pipeline outer wall spatial defects magnetic field and unbalance, and unbalance degree is also linear with defect magnetic field.The power supply that the Wheatstone bridge that is additionally made up of tunnel magneto resistance consumes is extremely faint, and therefore, the probe that tunnel magneto resistance electric bridge is constituted has highly sensitive a, good linearity than other magnetic sensitive probes and merit damages the low and thermally-stabilised feature such as good.
As shown in Figure 6,4 tunnel magneto resistance TMR1～4 form Wheatstone bridge, during pipe surface zero defect magnetic field, bridge balance, it is output as zero；During the defective magnetic field of pipe surface, electric bridge is unbalance, exports flaw indication.
The action principle of the present embodiment:
The boundary condition of stationary magnetic field
In the separating surface both sides of two kinds of different magnetizing mediums, the normal direction of magnetic induction and magnetic field intensity and tangential component, meet following boundary condition:
(1) normal component of magnetic induction is continuous, and the normal component of magnetic field intensity is discontinuous:
(2) tangential component of magnetic field intensity is continuous, and the tangential component of magnetic induction is discontinuous.
That is, if entered the border of place defect 14 in the pipeline that pcrmeability is little from the ferromagnetic pipeline 6 that pcrmeability is big by the steady magnetic field executed outside the magnetizator of the present embodiment, magnetic field is heavily biased towards normal, and being refracted out pipeline outer wall space becomes defect magnetic field 15；If magnetic induction line from the defect 14 that pcrmeability is little enter pcrmeability big ferromagnetic pipeline 6 time, magnetic induction line substantial deviation normal, strongly converge in duct wall.So just in pipeline outer wall space, pipeline can being applied steady magnetizing field by magnetizator of the present utility model, arrange tunnel magneto resistance bridge array simultaneously between magnetizator, detection is refracted to the defect magnetic field 15 of pipeline external surface by defect 14.
Using method:
1, the detection state to pipeline
See Fig. 1: by the close detected pipeline 6 of two pieces of magnetization pole shoes 3 of portable for pressure-bearing industrial pipeline on-line measuring device, two V-arrangement trundles 5 on the downside of it are allowed to be pressed in pipeline external surface, adjust probe standing screw 10, make probe 12 and the laminating of detected pipeline external surface.Again two pieces of magnetic short circuited rings 4 are moved to the upper end of magnetic conduction handle 1 and fixed, the magnetic field of two blocks of permanent Magnet 2 couples together by polarity series system and the duct wall being between two pieces of magnetization pole shoes 3 is magnetized fully, if existing defects 14 in duct wall, boundary condition according to stationary magnetic field, a part of magnetic field is refracted to pipeline external surface by defect 14, form defect magnetic field 15, tunnel magneto resistance bridge array 13 is set between magnetizator simultaneously and detects.It is operated by personnel or machinery, or circumference axial along pipeline promotes portable electromagnetic detection by the whole outer surface of pipeline, the result of detection is by the special soft figure forming the reflection position of defect and the order of severity, it is achieved to online pressure-bearing industrial pipeline reliable, facilitate and comprehensively detect.
2, non-detection status
Seeing Fig. 2: when two magnetic short circuited rings 4 are linked in permanent Magnet 2 both sides, the magnetic field sent from permanent Magnet one pole is directly coupled to another pole by magnetic short circuited ring, and only seldom magnetic field is coupled on duct wall, it is possible to is easily extracted by detecting device and leaves pipeline.
The present embodiment has techniques below feature:
1, permanent Magnet and portable magnetic circuit is adopted to form light magnetizator, pipeline is carried out steady magnetic field magnetization, pipeline external surface can be excited, the defect of any position in inner-walls of duct and wall can be excited again in pipeline external surface space to form defect magnetic field, meet the reliable of on-line industry pipeline and complete detection requirement；
2, power supply magnetic field and any detection couplant need not be executed outward, both saved power supply and testing cost, ensure that again testing result is reliable and stable；
3, the sound wave that the steady magnetic field of permanent Magnet is not formed by the high steam in online pipeline or current disturbs, and both can pipeline parts be detected, and the pipeline in on-line operation can be implemented Site Detection again；
4, many group tunnel magneto resistance electric bridges are adopted to constitute probe, when there is no defect in pipeline, pipeline external surface zero defect magnetic field, magneto-resistor bridge balance, it does not have signal exports；When in pipeline defective time, form defect magnetic field at pipeline external surface, magneto-resistor electric bridge is unbalance, the output of sensor defective signal, and such detecting device both can along pipeline external surface mobile detection rapidly, it is also possible to stops at any place of pipeline and realizes static detection.
5, portable pressure-bearing industrial pipeline perseverance magnetic on-line measuring device is formed by permanent Magnet and portable magnetic circuit, light small and exquisite, it is simple to operation, there is the advantage such as simple in construction, easily fabricated, low, safe and reliable, the energy-conserving and environment-protective of operation troubles rate simultaneously.
Above-described this utility model embodiment, is not intended that the restriction to this utility model protection domain.Any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within claims of the present utility model.
Claims (8)
1. portable pressure-bearing industrial pipeline permanent magnetic detection device online, it is characterised in that: include magnetizable body and detection agency；
Described magnetizable body includes a magnetic conduction handle (1), two pieces of permanent Magnet (2), two pieces of magnetization pole shoes (3)；The two ends of described magnetic conduction handle are connected with the upper end of two blocks of permanent Magnet respectively, and the lower end of every block of permanent Magnet is connected with one piece of magnetization pole shoe again；
Described detection agency includes probe (12) and tunnel magneto resistance bridge array (13)；The two ends of described probe are connected with the inner side of the magnetization pole shoe (3) being positioned at magnetic conduction handle two ends, and probe is positioned at the centre position of two pieces of magnetization pole shoes；The outer wall of the detected pipeline of probe bottom laminating, the inner chamber of probe is equipped with tunnel magneto resistance bridge array (13).
2. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterized in that: the polarity of the two blocks of described permanent Magnet being positioned at magnetic conduction handle (1) two ends connects by the form of series connection, the magnetic making two blocks of permanent Magnet is that superposition strengthens, it is achieved the abundant magnetization to duct wall.
3. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterised in that: described magnetizable body also includes the magnetic short circuited ring (4) with magnetic property；Two described magnetic short circuited ring ring sets respectively are at the two ends of magnetic conduction handle (1)；
Magnetic short circuited ring can along magnetic conduction handle slide downward and be enclosed within be positioned at magnetic conduction handle two ends permanent Magnet (2) around so that the magnetic field that permanent Magnet one pole sends is directly coupled to perseverance another pole of Magnet by magnetic short circuited ring；Or
Magnetic short circuited ring also can along magnetic conduction handle upward sliding and be located away the permanent Magnet (2) at magnetic conduction handle two ends around so that perseverance another pole of Magnet is coupled to by tested duct wall in the magnetic field that permanent Magnet one pole sends, it is achieved the magnetization to tested duct wall.
4. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterised in that: described magnetizable body also includes roller (5)；Roller described in two groups is separately fixed at the outside of magnetization pole shoe (3) so that magnetization pole shoe (3) and detected pipeline keep the distance that sets and can along pipe surface axially or circumference mobile.
5. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterised in that: described detection agency also includes fixed support (7), probe position-limited rack (9), probe standing screw (10), probe pressuring spring (11)；The both sides of described probe position-limited rack (9) are moved in the chute of fixed support (7) both sides, bottom, described probe standing screw (10) top with the screw on fixed support (7) to threaded, bottom is connected through the through hole on probe position-limited rack with the probe (12) being positioned at below probe position-limited rack, described probe pressuring spring (11) is contained between fixed support and probe position-limited rack and is enclosed within probe standing screw, and probe (12) is oppressed and be fitted in the outer wall of detected pipeline by probe pressuring spring.
6. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterised in that: the cross section of described magnetic conduction handle (1) and the cross section of two pieces of permanent Magnet (2) are the circle with same diameter.
7. portable pressure-bearing industrial pipeline according to claim 1 permanent magnetic detection device online, it is characterised in that: described tunnel magneto resistance bridge array (13) is the many groups electric bridge being made up of the tunnel magneto resistance of many.
8. portable pressure-bearing industrial pipeline according to claim 7 permanent magnetic detection device online, it is characterised in that: described electric bridge is Wheatstone bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620054493.1U CN205372090U (en) | 2016-01-20 | 2016-01-20 | Online permanent magnetism detection device of portable pressure -bearing industrial pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620054493.1U CN205372090U (en) | 2016-01-20 | 2016-01-20 | Online permanent magnetism detection device of portable pressure -bearing industrial pipeline |
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| Publication Number | Publication Date |
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| CN205372090U true CN205372090U (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620054493.1U Withdrawn - After Issue CN205372090U (en) | 2016-01-20 | 2016-01-20 | Online permanent magnetism detection device of portable pressure -bearing industrial pipeline |
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| CN (1) | CN205372090U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546359A (en) * | 2016-01-20 | 2016-05-04 | 合肥中大检测技术有限公司 | Convenient online constant magnetic detection device for pressure-bearing industrial pipeline |
-
2016
- 2016-01-20 CN CN201620054493.1U patent/CN205372090U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546359A (en) * | 2016-01-20 | 2016-05-04 | 合肥中大检测技术有限公司 | Convenient online constant magnetic detection device for pressure-bearing industrial pipeline |
| CN105546359B (en) * | 2016-01-20 | 2017-10-03 | 合肥中大检测技术有限公司 | The online permanent magnetic detection device of portable pressure-bearing industrial pipeline |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160706 Effective date of abandoning: 20171003 |