CN107941855A - A kind of pipe end thermal imaging detection device based on permanent magnet rotary heating - Google Patents
A kind of pipe end thermal imaging detection device based on permanent magnet rotary heating Download PDFInfo
- Publication number
- CN107941855A CN107941855A CN201711175095.0A CN201711175095A CN107941855A CN 107941855 A CN107941855 A CN 107941855A CN 201711175095 A CN201711175095 A CN 201711175095A CN 107941855 A CN107941855 A CN 107941855A
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- Prior art keywords
- permanent magnet
- pipe end
- detection device
- thermal imaging
- imaging detection
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
-
- 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
Abstract
The invention discloses a kind of pipe end thermal imaging detection device based on permanent magnet rotary heating, it is characterised in that including：Permanent magnet rotative heater and thermal infrared imager.Array permanent magnet even circumferential is fixed on swivel mount, and keeps certain lift-off distance with steel pipe internal-surface.Swivel mount drives permanent magnet to produce rotating excitation field under motor driving, and steel pipe cutting magnetic induction line, produces induced electromotive force, and then produces dynamic raw vortex.When pipe end existing defects, it will hinder the conduction of dynamic raw vortex, so that cause the vortex density of defect area to significantly increase, Joule heat Relatively centralized, the temperature of defect area is ultimately resulted in apparently higher than area free from defect, then pipe end surface temperature is picked up to detect defect by thermal infrared imager.The thermal imaging detection device can be all-round to being evenly heated to pipe end progress, greatly simplifies heating process.The device need not be contacted directly with pipe end, and testing result visualization, improves detection efficiency, reduce cost.
Description
Technical field
The present invention relates to vortex thermal imaging field of non destructive testing, is specifically a kind of steel pipe based on permanent magnet rotary heating
Hold thermal imaging detection device.
Background technology
In present automatic flaw detection of steel pipes detection, due to locus difference between plant machinery structure, probe and by
Detect the limitation of steel pipe movement etc., it is difficult to which the meeting avoided forms check frequency in pipe end, and is difficult to eliminate.Check frequency
Presence can bring very big security risk to the quality of tube product, and current processing method is the detection of excision termination mostly
Blind area, causes the waste of material, it is therefore necessary to carries out carrying out flaw detection to pipe end.
Magnetic testing has been widely used in the carrying out flaw detection of pipe end.Magnetic testing is to utilize magnetizing assembly will
Pipe end magnetizes after-applied magnetic flaw detection ink or magnetic powder, and in the presence of surface of test piece is defective, the magnetic line of force will bypass defect and produce
Flexural deformation, and then identify defect.But steel pipe must be magnetized before carrying out flaw detection, the good and bad of magnetic efficiency will be straight
Connecing influences the accuracy of detection of defect and it is necessary to manually applies magnetic powder, detection speed is slower.Magnetic testing requires steel tube surface must
Must be smooth, so need to polish and could be carried out after prerinse, and process of detecting a flaw needs special magnetic powder flaw detector, flaw detection finishes
After need to demagnetize, finally clean.Complex for operation step, complex process, pollutes environment.
The content of the invention
For the present situation and deficiency of existing pipe end defect inspection method, it is an object of the invention to provide one kind to be based on
The pipe end thermal imaging detection device of permanent magnet rotary heating, to solve inspection existing for existing pipe end defect inspection method
The problems such as survey complex steps, detection speed is slow, pollution environment.
Pipe end thermal imaging detection device provided by the invention based on permanent magnet rotary heating, its composition include：Forever
Magnet rotative heater and thermal infrared imager.Permanent magnet is in pipe end internal rotating, generation rotating excitation field.Based on faraday
The law of electromagnetic induction, since pipe end and rotating excitation field produce relative motion, will produce dynamic raw vortex in pipe end, according to
Joule's law, realizes the all-round to being evenly heated of pipe end.When pipe end existing defects, defect area temperature will be shown
Work is higher than non-defective region, pipe end surface temperature signal is gathered using thermal infrared imager, so as to fulfill pipe end surface
The high sensitivity detection of defect.
In the above-mentioned technical solutions, the rotating excitation field is rotated by array permanent magnet and produced, steel pipe transfixion.
In the above-mentioned technical solutions, the permanent magnet is circumferentially uniformly distributed in inside pipe end, and quantity is even number and not
Less than 2.
In the above-mentioned technical solutions, opposite polarity between two adjacent permanent magnets.
In the above-mentioned technical solutions, the swivel mount is made of permeability magnetic material.
In the above-mentioned technical solutions, the lift-off distance between permanent magnet and steel pipe internal-surface is not more than 10mm.
In the above-mentioned technical solutions, the rotating speed of the rotating excitation field adjusts, and the linear velocity of permanent magnet is not less than 5m/s.
In the above-mentioned technical solutions, the thermal infrared imager is arranged on the outside of firm pipe pipe end.
In the above-mentioned technical solutions, the thermal infrared imager is arranged circumferentially, and quantity is not less than 2.
Pipe end thermal imaging detection device provided by the invention based on permanent magnet rotary heating, its with it is following very
The advantages of prominent：
1. it can realize effective detection of pipe end defect.Pipe end produces dynamic with rotating excitation field relative motion cutting magnetic induction line
Raw vortex, when pipe end existing defects, it hinders the conduction of dynamic raw vortex, and the different of Joule heat is caused in defect area
Often distribution, steel tube defect can be detected by being arranged in the thermal infrared imager on the outside of steel pipe.
2. detection device need not be contacted directly with pipe end, testing result visualization, improves detection efficiency, reduces
Cost, detection process are environment friendly and pollution-free.
Brief description of the drawings
Fig. 1 is the pipe end thermal imaging structure of the detecting device schematic diagram based on permanent magnet rotary heating
Fig. 2 produces schematic diagram for rotating excitation field and dynamic raw vortex
Fig. 3 is the schematic diagram that the pipe end thermal imaging detection device based on permanent magnet rotary heating detects pipe end
Each reference numbers in above-mentioned attached drawing represent that object is respectively：1- steel pipes；2- thermal infrared imagers；3- permanent magnet rotary heatings
Device；4- motors；5- magnetic induction lines；6th, 7,8,9- moves raw vortex；10- swivel mounts；11st, 12,13,14- permanent magnets；15- defects.
Embodiment
Provide below in conjunction with the accompanying drawings the present invention embodiment, and by embodiment to the present invention based on
The pipe end thermal imaging detection device of permanent magnet rotary heating is further described.It is it is important to note that of the invention
Embodiment be not limited to the described form of embodiment.
The direction term being previously mentioned in the embodiment below, such as：Up, down, left, right, before and after etc., only
It is the direction of refer to the attached drawing.Therefore, the direction term used is intended merely to facilitate the explanation present invention, is not used for limiting this hair
It is bright.
Pipe end thermal imaging detection device based on the permanent magnet rotary heating detection pipe end surface of the present embodiment,
Using four permanent magnets, its structure diagram is as shown in Figure 1, forming includes：Steel pipe 1, thermal infrared imager 2, permanent magnet rotation add
Hot device 3.Permanent magnet is uniformly distributed in pipe end internal circumferential, and motor 4 drives permanent magnet rotation, and then produces Space Rotating magnetic
.Steel pipe 1 cuts rotating excitation field, produces dynamic raw vortex inside it.Thermal infrared imager 2 obtains the abnormal temperature letter of steel tube surface
Cease to realize defects detection.
When detecting pipe end using apparatus of the present invention, rotating excitation field and dynamic raw vortex generation schematic diagram are as shown in Figure 2.Phase
Opposite polarity during adjacent permanent magnet installation, such as permanent magnet 11 and permanent magnet 14.Motor 4 is with rotating speednAt the uniform velocity rotate, pass through swivel mount
The 10 drive rotations of array permanent magnets 11,12,13,14 form rotating excitation field, and relative motion is produced with steel pipe, according to the right-hand rule,
Dynamic raw vortex 6,7,8,9 as depicted, the conduction side of adjacent dynamic raw vortex are produced in the steel duct close to permanent magnetism body position
To opposite.
When existing defects in steel pipe, as shown in figure 3, defect 15 can hinder 6 conduction in steel pipe 1 of dynamic raw vortex, draw
The vortex density for playing defect area is significantly greater than non-defective region, and according to Joule's law, the temperature for ultimately resulting in defect area is bright
It is aobvious to be higher than non-defective region.Based on vortex thermal imaging principle, thermal infrared imager 2 can detect the presence of defect 15, realize steel
The detection of pipe pipe end defect.
So detection device using the present invention can fast and accurately realize the high sensitivity inspection of pipe end defect
Survey.
Claims (9)
- A kind of 1. pipe end thermal imaging detection device based on permanent magnet rotary heating, it is characterised in that including：Installed in steel Thermal infrared imager on the outside of pipe pipe end（2）, permanent magnet rotative heater inside pipe end（3）, the permanent magnet Rotative heater is made of array permanent magnet (11), (12), (13), (14) and swivel mount (10), and permanent magnet rotation produces rotation Magnetic field, and relative motion occurs with pipe end, steel pipe cutting magnetic induction line produces dynamic raw vortex, in the inhibition of steel tube defect Under, defect area moves raw vortex and more concentrates, so that defect area temperature is higher than non-defective regional temperature, recycles infrared Thermal imaging system pick up pipe end surface temperature, so as to distinguish pipe end there are the defects of.
- 2. the pipe end thermal imaging detection device according to claim 1 based on permanent magnet rotary heating, its feature exist In：Rotating excitation field is rotated by array permanent magnet to be produced, steel pipe transfixion.
- 3. the pipe end thermal imaging detection device according to claim 1 based on permanent magnet rotary heating, its feature exist In：Permanent magnet is located inside pipe end, is circumferentially uniformly distributed, and quantity is for even number and no less than 2.
- 4. the pipe end thermal imaging detection device based on permanent magnet rotary heating according to claim 1 or 3, its feature It is：Opposite polarity between two adjacent permanent magnets when permanent magnet is installed.
- 5. the pipe end thermal imaging detection device according to claim 1 based on permanent magnet rotary heating, its feature exist In：The swivel mount of fixed permanent magnet makes of permeability magnetic material.
- 6. the pipe end thermal imaging detection device based on permanent magnet rotary heating according to claim 1 or 3, its feature It is：The lift-off distance of permanent magnet and steel pipe internal-surface is not more than 10mm.
- 7. the pipe end thermal imaging detection device according to claim 1 or 2 based on permanent magnet rotary heating, its feature It is：The rotating speed of rotating excitation field adjusts, and rotary speed is set according to diameter of steel tube, and permanent magnet linear velocity is not less than 5m/s.
- 8. the pipe end thermal imaging detection device according to claim 1 based on permanent magnet rotary heating, its feature exist In：Thermal infrared imager is positioned on the outside of pipe end.
- 9. the pipe end thermal imaging detection device based on permanent magnet rotary heating according to claim 1 or 7, its feature It is：Thermal infrared imager is circumferentially evenly arranged, no less than 2.
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| CN201711175095.0A CN107941855A (en) | 2017-11-22 | 2017-11-22 | A kind of pipe end thermal imaging detection device based on permanent magnet rotary heating |
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|---|---|---|---|
| CN201711175095.0A CN107941855A (en) | 2017-11-22 | 2017-11-22 | A kind of pipe end thermal imaging detection device based on permanent magnet rotary heating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480419A (en) * | 2019-08-30 | 2019-11-22 | 四川大学 | A kind of covering Milling Process defect detecting device |
| CN111157577A (en) * | 2020-02-13 | 2020-05-15 | 四川大学 | Steel pipe magnetization eddy current thermal imaging defect detection device |
| CN112763014A (en) * | 2021-02-05 | 2021-05-07 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN113108711A (en) * | 2021-04-16 | 2021-07-13 | 南京金创有色金属科技发展有限公司 | High-temperature pipeline compensation section deformation measurement method |
| CN113758994A (en) * | 2021-09-29 | 2021-12-07 | 华中科技大学 | Motional eddy current detection method based on magneto-optical effect |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480419A (en) * | 2019-08-30 | 2019-11-22 | 四川大学 | A kind of covering Milling Process defect detecting device |
| CN111157577A (en) * | 2020-02-13 | 2020-05-15 | 四川大学 | Steel pipe magnetization eddy current thermal imaging defect detection device |
| CN112763014A (en) * | 2021-02-05 | 2021-05-07 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN112763014B (en) * | 2021-02-05 | 2021-09-21 | 江苏华尔威科技集团有限公司 | Oil well measuring system based on internet of things technology |
| CN113108711A (en) * | 2021-04-16 | 2021-07-13 | 南京金创有色金属科技发展有限公司 | High-temperature pipeline compensation section deformation measurement method |
| CN113758994A (en) * | 2021-09-29 | 2021-12-07 | 华中科技大学 | Motional eddy current detection method based on magneto-optical effect |
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