CN2391203Y - Rotary eddy current detecting probe - Google Patents
Rotary eddy current detecting probe Download PDFInfo
- Publication number
- CN2391203Y CN2391203Y CN 99217658 CN99217658U CN2391203Y CN 2391203 Y CN2391203 Y CN 2391203Y CN 99217658 CN99217658 CN 99217658 CN 99217658 U CN99217658 U CN 99217658U CN 2391203 Y CN2391203 Y CN 2391203Y
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- CN
- China
- Prior art keywords
- eddy current
- utility
- model
- detecting
- coil
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- Expired - Fee Related
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- 239000000523 sample Substances 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model relates to a rotary eddy current detecting probe which comprises a detecting point 11 provided with a detecting coil. The detecting point 11 is arranged on a rotary disk 1 driven by a rotary shaft 5 driven by an electric machine 10. The upper part of the rotary shaft 5 is provided with a magnetic member winding 4 which comprises an inner ring coil 13 and an outer ring coil 14 which are mutually coupled. The inner ring coil 13 is fixed on the rotary shaft 5. The utility model can be suitable for detecting workpieces with complicated cross-sectional shapes, such as a railway rail. The utility model has the advantages of simple structure, small volume of the detecting coil, quick frequency response, high sensitivity, strong anti-interference ability, and wide applicability. The utility model can work within the space range of 2-6 mm and is especially suitable for the crack detection of a rough surface.
Description
The utility model relates to the probe that a kind of inspected object defective is used, and particularly the rail surface imperfection is carried out the probe that eddy current is surveyed usefulness.
In the prior art, rail is generally adopted the ultrasonic listening deep zone defect, the EDDY CURRENT surface imperfection.The ultimate principle of eddy current test is: when a high-frequency current (excitation) coil is placed on metal (as heavy rail, slab etc.) surface, because under the effect of variation magnetic field, the metal surface forms an excitation field, this magnetic field produces closed voluntarily current vortex in the metal surface, this current vortex also produces the magnetic field of oneself, its direction is opposite with excitation field, its effect is to weaken original excitation field intensity, whether can make eddy current produce the factor of distortion on its weakening degree and metal material and the vortex flowpath, relevant as geometric configuration, various defectives etc.The variation of eddy current changes the resultant magnetic field thereupon, and the variation by the magnetic test coil impedance, reflects with the form of magnetic test coil terminal voltage, gets this change information, through amplifying and signal Processing, shows by instrument, reaches the purpose of test material.EDDY CURRENT mode of the prior art generally is at a rotating disc several probes to be installed, detected workpiece moves along its length direction in the rotation of rotating disc, it detects track and has formed several helixes, this kind structure is applicable to the workpiece of circular cross sectional shape substantially, then can't use for rail equal section workpiece in irregular shape.
General rail gets rusty in the cause of dispatching from the factory, corrode and cause rough surface, and bigger to existing eddy current testing instrument sensitivity influence, therefore the crackle on rail surface is to adopt the observation method of naked eye inspection at present, can only find big, the tangible crackle of size.
The purpose of this utility model is to obtain a kind of novel rotary eddy current probe, carries out crack detection applicable to the workpiece such as the planes such as rail tread, the flange of rail of rough surface and corrosion, and highly sensitive, and antijamming capability is strong.
For achieving the above object, the technical scheme that the utility model proposes is:
A kind of rotary eddy current probe, comprise the measuring point 11 that magnetic test coil is housed, this measuring point 11 is installed on the rotating disk 1 of rotating shaft 5 drives, and magnetic spare winding 4 is arranged in the rotating shaft 5, magnetic spare winding 4 comprises inner loop-line circle 13 and the outer shroud coil 14 that intercouples, and inner loop-line circle 13 is fixed in the rotating shaft 5.
Rotating shaft 5 is driven by motor 10.
Outer shroud coil 14 is fixed on the housing 2.
Fig. 1 is the structural representation of the rotary eddy current probe of the utility model.
Introduce an embodiment of the present utility model below in conjunction with accompanying drawing.
The utility model can be prepared several detection probe according to the section configuration of measured workpiece, this embodiment is used to detect heavy rail tread, flange of rail surface crack, can a detection probe be installed at tread, 2～4 probes are installed in the bottom surface, the working method of each probe is identical.Referring to Fig. 1, the rotating shaft 5 of probe is driven by motor 10, and rotating shaft 5 is fixed in the housing 2 by two groups of bearings 3, and 12 is bearing holder (housing, cover), and as a whole with pressing mother 6, pad 7 and nut 8 to be fixed, 9 is end cap.Rotating disk 1 is contained in rotating shaft 5 ends, is directly driven by dc speed-regulating motor 10, and motor speed is adjustable in 0～5000rpm scope.
Principle of work of the present utility model is: carry out high-velocity scanning by 11 pairs of measured workpieces of the measuring point on the rotating disk 1 of high speed rotating, rotating disk 1 and inner loop-line circle 13 are driven synchronously by rotating shaft and rotate, in the measuring point 11 magnetic test coil is installed, the inner loop-line circle 13 of the detection signal input winding 4 that obtains is drawn by the transformer principle coupling by outer shroud 14.
The main performance of this probe is:
Rotating disk is apart from the gap delta=2～6mm of the face of survey
Signal to noise ratio (S/N ratio): (on the oxidation corrosion layer depth δ=0.2mm), standard is hindered dark 0.4 * wide by 1 * long 20 (mm) at the steel flat board
Motor speed 2500rpm, gap delta=3mm, signal to noise ratio (S/N ratio) 16dB
Single pass width 50mm.
Compared with prior art, the utility model is both applicable to the section configuration complex part Detect, also can be used for dull and stereotyped the detection, can hinder such as crackle for its surface, be mingled with, peeling etc. Detect. It is simple in structure, and the magnetic test coil volume is little, and frequency response is fast, sensitivity Height, antijamming capability is strong, can work in 2～6mm interstice coverage, is subjected to surface roughness Affect littlely, be specially adapted to the crack detection of rough surface, wide adaptability. The method is non-Contact does not need again couplant, can avoid environmental pollution, and is easy to operate.
Claims (3)
1. rotary eddy current probe, comprise the measuring point (11) that magnetic test coil is housed, it is characterized in that: measuring point (11) is installed on the rotating disk (1) of rotating shaft (5) drive, magnetic spare winding (4) is arranged in the rotating shaft (5), magnetic spare winding (4) comprises inner loop-line circle (13) and the outer shroud coil (14) that intercouples, and inner loop-line circle (13) is fixed in the rotating shaft (5).
2. rotary eddy current probe according to claim 1 is characterized in that: described rotating shaft (5) is driven by motor (10).
3. rotary eddy current probe according to claim 1 is characterized in that: described outer shroud coil (14) is fixed on the housing (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99217658 CN2391203Y (en) | 1999-08-06 | 1999-08-06 | Rotary eddy current detecting probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99217658 CN2391203Y (en) | 1999-08-06 | 1999-08-06 | Rotary eddy current detecting probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2391203Y true CN2391203Y (en) | 2000-08-09 |
Family
ID=34009021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99217658 Expired - Fee Related CN2391203Y (en) | 1999-08-06 | 1999-08-06 | Rotary eddy current detecting probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2391203Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427946C (en) * | 2005-01-31 | 2008-10-22 | 林俊明 | Method and device for rapid determining metal content in ore powder |
| CN102253113A (en) * | 2011-04-27 | 2011-11-23 | 苏州龙骏无损检测设备有限公司 | Transformer type high-speed signal coupling transmitter |
| CN102338774A (en) * | 2011-06-23 | 2012-02-01 | 苏州龙骏无损检测设备有限公司 | Coaxially-rotating signal coupling transmitter |
| CN102507730A (en) * | 2011-10-17 | 2012-06-20 | 中广核检测技术有限公司 | Probe for inspecting vortex of anti-pressure shell of control rod driving mechanism in CEPR (Centre for Economic Policy Research) nuclear power station |
-
1999
- 1999-08-06 CN CN 99217658 patent/CN2391203Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427946C (en) * | 2005-01-31 | 2008-10-22 | 林俊明 | Method and device for rapid determining metal content in ore powder |
| CN102253113A (en) * | 2011-04-27 | 2011-11-23 | 苏州龙骏无损检测设备有限公司 | Transformer type high-speed signal coupling transmitter |
| CN102338774A (en) * | 2011-06-23 | 2012-02-01 | 苏州龙骏无损检测设备有限公司 | Coaxially-rotating signal coupling transmitter |
| CN102507730A (en) * | 2011-10-17 | 2012-06-20 | 中广核检测技术有限公司 | Probe for inspecting vortex of anti-pressure shell of control rod driving mechanism in CEPR (Centre for Economic Policy Research) nuclear power station |
| CN102507730B (en) * | 2011-10-17 | 2015-07-15 | 中广核检测技术有限公司 | Probe for inspecting vortex of anti-pressure shell of control rod driving mechanism in CEPR (Centre for Economic Policy Research) nuclear power station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |