CN109060943A - Steel rail defect length detecting method based on leakage magnetic detection device - Google Patents
Steel rail defect length detecting method based on leakage magnetic detection device Download PDFInfo
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- CN109060943A CN109060943A CN201811008107.5A CN201811008107A CN109060943A CN 109060943 A CN109060943 A CN 109060943A CN 201811008107 A CN201811008107 A CN 201811008107A CN 109060943 A CN109060943 A CN 109060943A
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- signal
- rail
- detection device
- defect length
- leakage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
The invention discloses the steel rail defect length detecting methods based on leakage magnetic detection device, and leakage magnetic detection device is placed on rail to be detected first, measure the magnetic leakage signal of rail to be detected in the x direction and the y direction；Then after carrying out bandpass filtering, enhanced processing to the two magnetic leakage signals using blocking method, the signal time domain distribution map, the signal time domain distribution map with Y-direction that obtain X-direction；Then the signal period for extracting flaw indication in the signal time domain distribution map of X-direction, Y-direction respectively is X-direction, the signal characteristic value of Y-direction；Finally utilize relational expression, the relational expression of Y-direction defect length and Y-direction characteristic value TY of X-direction defect length and X-direction characteristic value TX, X-direction, the defect length of Y-direction is calculated, the present invention it is original be only able to detect magnetic leakage signal on the basis of quantitative analysis is carried out to the flaw indication of different length, can more accurately judge hurt serious conditions.
Description
Technical field
The present invention relates to measuring technique and instrument fields, more particularly to the inspection of the steel rail defect length based on leakage magnetic detection device
Survey method.
Background technique
At present, Magnetic Flux Leakage Inspecting is lossless has become one of the main method that steel rail defect length is detected.In non-destructive testing
The basic principle of Magnetic Flux Leakage Inspecting refers to, ferrimagnet is by after local magnetized, in local magnetized area, if the material have crackle or
The hurts such as person's pit, the Distribution of Magnetic Field at hurt can mutate, and have partial magnetic field that can leak out, and form magnetic flux leakage, pass through
Detect the changes of magnetic field of this part of ferrimagnet, it can be determined that this part of the material is with the presence or absence of damage
The leakage field field intensity of fault location and size, the power of measured workpiece internal magnetic field and the sensor of defect are away from measured workpiece
Distance, that is, the lift-off value on surface etc. is closely related, these factors can influence the sensitivity and reliability of detection simultaneously.It reasonably selects
Can above-mentioned parameter most important to obtain optimal testing result.And assessment of the measurement of defect length to measured workpiece hurt
Also most important, different defect lengths may will affect polishing and replacement to workpiece.Therefore, this method is a kind of determining steel
The detection method of rail defect length.
Summary of the invention
The technical problem to be solved by the present invention is to provide and filled based on Magnetic Flux Leakage Inspecting for defect involved in background technique
The steel rail defect length detecting method set.
Steel rail defect length detecting method based on leakage magnetic detection device, the leakage magnetic detection device include shell, magnetic yoke,
Excitation coil, Hall sensor array, the first castor and the second castor；
First castor, the second castor are all made of wide wheel, are separately positioned on the lower end surface of the shell, enable the shell
It is enough to be rolled on rail to be detected；
The magnetic yoke, excitation coil, Hall sensor array are arranged in the shell, wherein the magnetic yoke is in inverted U
Shape, on it, the excitation coil is connected with external power supply for the excitation coil winding, and the magnetic yoke is used for logical in excitation coil
Magnetic signal is issued towards rail to be detected when electric；The Hall sensor array is arranged in the magnetic yoke and the rail is flat
Row, for collecting magnetic leakage signal；
Steel rail defect length detecting method based on leakage magnetic detection device comprises the steps of:
Leakage magnetic detection device is placed on rail to be detected by step 1), keeps it even according to preset threshold speed along rail
Speed is advanced.Wherein, the spacing between Hall sensor array and rail, i.e. lift-off value t is equal to preset distance threshold；
Step 2, enabling leakage magnetic detection device position is origin O, and the direction of advance of leakage magnetic detection device is X-axis positive direction, is hung down
Straight rail surface upwardly direction to be detected is Z axis positive direction, is Y-axis positive direction perpendicular to the direction of XOY plane to the right；It is logical
It crosses the Hall sensor array and obtains the magnetic leakage signal of rail to be detected in the x direction and the y direction；
Step 3), using blocking method respectively to rail to be detected magnetic leakage signal in the x direction and the y direction carry out bandpass filtering,
After enhanced processing, the signal time domain distribution map, the signal time domain distribution map with Y-direction that obtain X-direction；
Step 4), the signal period for extracting flaw indication in the signal time domain distribution map of X-direction is the signal characteristic value of X-direction
TX, the signal period for extracting the signal time domain distribution map flaw indication of Y-direction is signal characteristic value TY, TX, TY unit of Y-direction
It is s；
Step 5) utilizes X-direction defect length lxWith the relational expression of X-direction characteristic value TX: lx=3.63TX1.37+ 4.61, by the side X
To signal characteristic value substitute into after the defect length l of X-direction is calculatedx, lxUnit is mm；
Step 6) utilizes Y-direction defect length lyWith the relational expression of Y-direction characteristic value TY: ly=5.22TY0.88+ 3.29, by the side Y
To signal characteristic value TY substitute into after the defect length l of Y-direction is calculatedy, lyUnit is mm.
It is described as the present invention is based on the further prioritization scheme of steel rail defect length detecting method of leakage magnetic detection device
Preset threshold speed is 10km/h.
As the present invention is based on the further prioritization scheme of steel rail defect length detecting method of leakage magnetic detection device, steps
3) 30 bandpass filterings for arriving 3000hz are carried out in, carry out 100 times of enhanced processing.
As the present invention is based on the further prioritization scheme of steel rail defect length detecting method of leakage magnetic detection device, steps
1) t=0.3mm in.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
It is original be only able to detect magnetic leakage signal on the basis of quantitative analysis is carried out to the flaw indication of different length, more accurately
Judge hurt serious conditions.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that magnetic yoke in the present invention, excitation coil, sensor array match.
In figure, 1- Hall sensor array, 2- magnetic yoke, 3- excitation coil.
Specific embodiment
The invention discloses a kind of steel rail defect length detecting method based on leakage magnetic detection device, as shown in Figure 1, described
Leakage magnetic detection device includes shell, magnetic yoke, excitation coil, Hall sensor array, the first castor and the second castor；
First castor, the second castor are all made of wide wheel, are separately positioned on the lower end surface of the shell, enable the shell
It is enough to be rolled on rail to be detected；
The magnetic yoke, excitation coil, Hall sensor array are arranged in the shell, wherein the magnetic yoke is in inverted U
Shape, on it, the excitation coil is connected with external power supply for the excitation coil winding, and the magnetic yoke is used for logical in excitation coil
Magnetic signal is issued towards rail to be detected when electric；The Hall sensor array is arranged in the magnetic yoke and the rail is flat
Row, for collecting magnetic leakage signal；
The detection method comprises the steps of:
Leakage magnetic detection device is placed on rail to be detected by step 1), make its along rail according to 8km/h speed at the uniform velocity before
Into, wherein spacing, i.e. lift-off value t=0.3mm between Hall sensor array and rail；
Step 2, enabling leakage magnetic detection device position is origin O, and the direction of advance of leakage magnetic detection device is X-axis positive direction, is hung down
Straight rail surface upwardly direction to be detected is Y-axis positive direction, is Y-axis positive direction perpendicular to the direction of XOY plane to the right；It is logical
It crosses the Hall sensor array and obtains the magnetic leakage signal of rail to be detected in the x direction and the y direction；
Step 3) carries out 30 to the magnetic leakage signal of rail to be detected in the x direction and the y direction respectively using blocking method and arrives 3000hz
Bandpass filtering, then carry out 100 times of enhanced processing after, the signal time domain distribution map, the signal with Y-direction that obtain X-direction
Time domain distribution map；
Step 4), the signal period for extracting flaw indication in the signal time domain distribution map of X-direction is the signal characteristic value of X-direction
TX, the signal period for extracting the signal time domain distribution map flaw indication of Y-direction is signal characteristic value TY, TX, TY unit of Y-direction
It is s；
Step 5) utilizes X-direction defect length lxWith the relational expression of X-direction characteristic value TX: lx=3.63TX1.37+ 4.61, by the side X
To signal characteristic value substitute into after the defect length l of X-direction is calculatedx, lxUnit is mm；
Step 6) utilizes Y-direction defect length lyWith the relational expression of Y-direction characteristic value TY: ly=5.22TY0.88+ 3.29, by the side Y
To signal characteristic value TY substitute into after the defect length l of Y-direction is calculatedy, lyUnit is mm.
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (4)
1. the steel rail defect length detecting method based on leakage magnetic detection device, the leakage magnetic detection device includes shell, magnetic yoke, swashs
Encourage coil, Hall sensor array, the first castor and the second castor；
First castor, the second castor are all made of wide wheel, are separately positioned on the lower end surface of the shell, enable the shell
It is enough to be rolled on rail to be detected；
The magnetic yoke, excitation coil, Hall sensor array are arranged in the shell, wherein the magnetic yoke is in inverted U
Shape, on it, the excitation coil is connected with external power supply for the excitation coil winding, and the magnetic yoke is used for logical in excitation coil
Magnetic signal is issued towards rail to be detected when electric；The Hall sensor array is arranged in the magnetic yoke and the rail is flat
Row, for collecting magnetic leakage signal；
It is characterized in that, the steel rail defect length detecting method based on leakage magnetic detection device comprises the steps of:
Leakage magnetic detection device is placed on rail to be detected by step 1), keeps it even according to preset threshold speed along rail
Speed is advanced.Wherein, the spacing between Hall sensor array and rail, i.e. lift-off value t is equal to preset distance threshold；
Step 2, enabling leakage magnetic detection device position is origin O, and the direction of advance of leakage magnetic detection device is X-axis positive direction, is hung down
Straight rail surface upwardly direction to be detected is Z axis positive direction, is Y-axis positive direction perpendicular to the direction of XOY plane to the right；It is logical
It crosses the Hall sensor array and obtains the magnetic leakage signal of rail to be detected in the x direction and the y direction；
Step 3), using blocking method respectively to rail to be detected magnetic leakage signal in the x direction and the y direction carry out bandpass filtering,
After enhanced processing, the signal time domain distribution map, the signal time domain distribution map with Y-direction that obtain X-direction；
Step 4), the signal period for extracting flaw indication in the signal time domain distribution map of X-direction is the signal characteristic value of X-direction
TX, the signal period for extracting the signal time domain distribution map flaw indication of Y-direction is signal characteristic value TY, TX, TY unit of Y-direction
It is s；
Step 5) utilizes X-direction defect length lxWith the relational expression of X-direction characteristic value TX: lx=3.63TX1.37+ 4.61, by the side X
To signal characteristic value substitute into after the defect length l of X-direction is calculatedx, lxUnit is mm；
Step 6) utilizes Y-direction defect length lyWith the relational expression of Y-direction characteristic value TY: ly=5.22TY0.88+ 3.29, by the side Y
To signal characteristic value TY substitute into after the defect length l of Y-direction is calculatedy, lyUnit is mm.
2. the steel rail defect length detecting method according to claim 1 based on leakage magnetic detection device, which is characterized in that institute
Stating preset threshold speed is 10km/h.
3. the steel rail defect length detecting method according to claim 1 based on leakage magnetic detection device, which is characterized in that step
The bandpass filterings of 3000hz are arrived in rapid 3) middle progress 30, carry out 100 times of enhanced processing.
4. the steel rail defect length detecting method according to claim 1 based on leakage magnetic detection device, which is characterized in that step
It is rapid 1) in t=0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811008107.5A CN109060943A (en) | 2018-08-31 | 2018-08-31 | Steel rail defect length detecting method based on leakage magnetic detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811008107.5A CN109060943A (en) | 2018-08-31 | 2018-08-31 | Steel rail defect length detecting method based on leakage magnetic detection device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030020469A1 (en) * | 2001-07-17 | 2003-01-30 | Gopichand Katragadda | Transverse crack detection in rail head using low frequency eddy currents |
| CN102735747A (en) * | 2012-04-10 | 2012-10-17 | 南京航空航天大学 | Defect quantitative identification method of high-speed magnetic flux leakage inspection of high-speed railway rails |
| US20130113472A1 (en) * | 2010-03-10 | 2013-05-09 | Jrb Engineering Pty Ltd | Method and apparatus for magnetic crack depth prediction |
| CN106274977A (en) * | 2016-07-27 | 2017-01-04 | 南京航空航天大学 | The direct current Magnetic Flux Leakage Testing System of a kind of trigger-type drainage pattern and method thereof |
| CN106353397A (en) * | 2016-09-06 | 2017-01-25 | 中国铁道科学研究院 | Vehicular magnetic flux leakage detecting equipment and system for steel rail surface damage |
-
2018
- 2018-08-31 CN CN201811008107.5A patent/CN109060943A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030020469A1 (en) * | 2001-07-17 | 2003-01-30 | Gopichand Katragadda | Transverse crack detection in rail head using low frequency eddy currents |
| US20130113472A1 (en) * | 2010-03-10 | 2013-05-09 | Jrb Engineering Pty Ltd | Method and apparatus for magnetic crack depth prediction |
| CN102735747A (en) * | 2012-04-10 | 2012-10-17 | 南京航空航天大学 | Defect quantitative identification method of high-speed magnetic flux leakage inspection of high-speed railway rails |
| CN106274977A (en) * | 2016-07-27 | 2017-01-04 | 南京航空航天大学 | The direct current Magnetic Flux Leakage Testing System of a kind of trigger-type drainage pattern and method thereof |
| CN106353397A (en) * | 2016-09-06 | 2017-01-25 | 中国铁道科学研究院 | Vehicular magnetic flux leakage detecting equipment and system for steel rail surface damage |
Non-Patent Citations (2)
| Title |
|---|
| 崔利东: "高速铁路漏磁检测缺陷识别技术", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑（月刊）》 * |
| 郝思思: "阵列式漏磁巡检设备的开发及钢轨裂纹定量分析", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑（月刊）》 * |
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Application publication date: 20181221 |