CN105987890A - Magnetic suspension concentration estimating method - Google Patents
Magnetic suspension concentration estimating method Download PDFInfo
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- CN105987890A CN105987890A CN201510080220.4A CN201510080220A CN105987890A CN 105987890 A CN105987890 A CN 105987890A CN 201510080220 A CN201510080220 A CN 201510080220A CN 105987890 A CN105987890 A CN 105987890A
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- concentration
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- round steel
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Abstract
The invention provides a magnetic suspension concentration estimating method. The method is used in the magnetic powder flaw detection process of round steel, and comprises the following steps: recording the initial concentration rho0 of a magnetic suspension before the flaw detection process, calculating the consumed concentration rhoc of the magnetic suspension, and subtracting the consumed concentration rhoc of the magnetic suspension from the initial concentration rho0 of a magnetic suspension to obtain the concentration rho of the magnetic suspension, that is, rho = rho0 - rhoc. The magnetic powder consumption is calculated through calculating the surface area of the round steel and the defect fluorescence intensity to estimate the concentration of the magnetic suspension, and the estimation result has high precision under a stable and continuous production condition.
Description
Technical field
The present invention relates to a kind of Particle content evaluation method.
Background technology
In the automatic magnetic powder inspection of round steel, the concentration of magnetic flaw detection ink is to affect the weight of wet method magnetic powder inspection effect
Want factor.During flaw detection, the magnetic powder of round steel surface attachment can be along with road work after round steel entrance
Sequence, causes Particle content constantly to reduce, until affecting the identification of defect.
Traditional Particle content measuring method is the pyriform precipitation tube using and measuring magnetic powder volume
Method.The method exist measurement time length, can not the shortcoming such as feedback in time, simultaneously as part
On dirt (such as sandy soil and oxide etc.) be brought in magnetic flaw detection ink, make measurement result inaccurate.
Also occur in that some new Particle content detection methods and device now.Such as patent CN
103063554 provide a kind of Particle content fast qualitative assay method based on transmittance, profit
Change, with concentration, the rule that its transmittance changes the most therewith with magnetic flaw detection ink, detect magnetic flaw detection ink
Concentration.But the method can not Accurate Determining concentration value, qualitative conclusions can only be given.
And for example patent CN 1712949A provides a kind of magnetic powder concentration sensor of magnetic suspension, utilizes
The curent change that simple electromagnetic induction causes is to measure Particle content.But in actual field
The change of middle current signal is little, disturb signal greatly so that the sensitivity of this device is relatively low.
It is an object of the invention to, propose the evaluation method of a kind of simple suspension concentration, and
It ensure that the precision of calculating.
Summary of the invention
To this end, the invention provides a kind of Particle content evaluation method, for the magnetic to round steel
Powder flaw detection process, including recording the initial concentration of described magnetic flaw detection ink before described flaw detection process is carried out
ρ0, calculate concentration ρ that described magnetic flaw detection ink is consumedc, with the initial concentration ρ of described magnetic flaw detection ink0Subtract
Go concentration ρ that described magnetic flaw detection ink is consumedcObtain described Particle content ρ, i.e. ρ=ρ0-ρc,
Wherein, concentration ρ that described magnetic flaw detection ink is consumed is calculatedcComprise the steps: that S1. is according to current
The surface area of the round steel detected a flaw calculates the concentration being currently consumed of described magnetic flaw detection ink, as
First currently consumes concentration ρ1′；S2. concentration ρ is currently consumed by described first1' disappear with the first history
Consumption concentration ρ1" add and, obtain the first consumption concentration ρ1, i.e. ρ1=ρ1′+ρ1", wherein, described
One history consumes concentration ρ1" during the flaw detection of the most previous round steel, calculated described magnetic flaw detection ink is disappeared
Concentration ρ of consumptionc；S3. concentration ρ is consumed by described first1The concentration being consumed as described magnetic flaw detection ink
ρc。
In order to improve estimation precision, present invention also offers a kind of Particle content evaluation method,
For the magnetic powder inspection process to round steel, including recording described magnetic before described flaw detection process is carried out
The initial concentration ρ of suspension0, calculate concentration ρ that described magnetic flaw detection ink is consumedc, use described magnetic flaw detection ink
Initial concentration ρ0Deduct concentration ρ that described magnetic flaw detection ink is consumedcObtain described Particle content
ρ, i.e. ρ=ρ0-ρc, wherein, calculate concentration ρ that described magnetic flaw detection ink is consumedcIncluding walking as follows
Rapid: S1 '. the currently quilt of described magnetic flaw detection ink is calculated according to the surface area of the round steel currently detected a flaw
The concentration consumed, currently consumes concentration ρ as first1′；S2 '. currently consume dense by described first
Degree ρ1' consume concentration ρ with the first history1" add and, obtain the first consumption concentration ρ1, i.e.
ρ1=ρ1′+ρ1", wherein, described first history consumes concentration ρ1" during the flaw detection of the most previous round steel
Concentration ρ that calculated described magnetic flaw detection ink is consumedc；S3 '. with described in ultraviolet source irradiation when
Before the round steel detected a flaw, with the defect fluoroscopic image of industry this round steel of collected by camera, calculate institute
State the mean fluorecence brightness of defect fluoroscopic image, as current defect fluorescent brightness V '；S4 '. will
Described current defect fluorescent brightness V ' and historic defects fluorescent brightness V " add and, obtain defect fluorescence
Brightness V, wherein, described historic defects fluorescent brightness V " calculates during the flaw detection of the most previous round steel
The described defect fluorescent brightness V obtained；S5 '. calculate described magnetic by described defect fluorescent brightness V
The concentration being consumed of suspension, consumes concentration ρ as second2；S6 '. consume dense by described first
Degree ρ1Concentration ρ is consumed with described second2Add and, obtain concentration ρ that described magnetic flaw detection ink is consumedc。
Further, described first concentration ρ is currently consumed1' calculate according to equation below:
ρ1'=a π DL, wherein, a is area-magnetic powder consumption coefficient, D and L is respectively and currently visits
The diameter of the round steel of wound and length.Described current defect fluorescent brightness V ' calculates according to equation below:Wherein, C is the number of the pixel of described defect fluoroscopic image, ViLack for described
Fall into the brightness of each pixel of fluoroscopic image.Described by described current defect fluorescent brightness V ' with go through
History defect fluorescent brightness V " add and be weighting add and, i.e. "+(1-α) V ', wherein α is the to V=α V
One weight coefficient, value is 0-1, and preferred value is about 0.1.Described second consumes concentration ρ2Root
Calculate according to equation below: ρ2=b (V0-V), wherein, b is fluorescence-magnetic powder consumption coefficient, V0For
Initial fluorescence brightness.Described by described first consumption concentration ρ1Concentration ρ is consumed with described second2Add
With add for weighting and, i.e. ρc=β ρ1+(1-β)ρ2, wherein β is the second weight coefficient, and value is
0-1, its preferred value is more than 0.5, and in the case of the change of round steel specification is little, preferred value is 0.9.
The present invention utilizes the industrial camera of the automatic magnetic powder inspection of round steel, propose a kind of simple and easy to do,
The not Particle content evaluation method of optional equipment.The method by calculate round steel surface area and
Defect fluorescence intensity calculates magnetic powder consumption, estimates Particle content.It produces in steady and continuous
In the case of, estimation result has higher precision.
Accompanying drawing explanation
Fig. 1 is the application schematic diagram of the Particle content evaluation method of the present invention.
Description of reference numerals:
1: ultraviolet source 2: round steel 3: industrial camera
Detailed description of the invention
With detailed description of the invention, the Particle content evaluation method of the present invention is made below in conjunction with the accompanying drawings
Described in further detail, but not as a limitation of the invention.
As it is shown in figure 1, be the application schematic diagram of the Particle content evaluation method of the present invention.Will
Ultraviolet source 1 irradiates the round steel 2 detected a flaw, and industrial camera 3 gathers the image of defect area, logical
Cross and calculate the surface area of round steel detected a flaw and the fluorescence intensity of defect area disappears to calculate magnetic powder
Consumption, thus estimate the concentration of magnetic flaw detection ink.
The Particle content evaluation method of the present invention is below described preferred embodiment.
Step S1 or S1 ': read diameter D and length L of the round steel currently detected a flaw, and
Calculate first according to equation below and currently consume concentration ρ1':
ρ1'=a π DL, wherein, a is area-magnetic powder consumption coefficient.
Area-magnetic powder consumption coefficient a is calibration value, it is possible to use specification (diameter and length) is united
The a number of round steel of one is demarcated.When a number of round steel is after fault detection system,
According to this formula reference area-magnetic powder consumption coefficient a:Wherein, N is for demarcating
The quantity of round steel, DBThe diameter of the round steel for demarcating, LBThe length of the round steel for demarcating, ρB0
For demarcating the Particle content before detecting a flaw, ρB1For demarcating the Particle content after detecting a flaw.
Step S2 or S2 ': currently consume concentration ρ by first1' consume concentration ρ with the first history1" add
With, obtain the first consumption concentration ρ1, i.e. ρ1=ρ1′+ρ1″.Wherein, the first history consumes concentration ρ1″
Concentration ρ that during flaw detection of the most previous round steel, calculated magnetic flaw detection ink is consumedc。
The most calculated first consumes concentration ρ1Concentration ρ can being consumed as magnetic flaw detection inkc
Finally estimate the concentration of magnetic flaw detection ink, but the error of the result so estimated is relatively big, therefore,
Also need to following steps to improve the precision of estimation.
Step S3 ': the round steel the most detected a flaw with ultraviolet source irradiation, with industry collected by camera
The defect fluoroscopic image of this round steel, calculates the most glimmering of this defect fluoroscopic image according to equation below
Brightness, i.e. current defect fluorescent brightness V ':
Wherein, C is the number of the pixel of defect fluoroscopic image, ViGlimmering for defect
The brightness of each pixel of light image.
Wherein, defect fluoroscopic image be by the surface defect of round steel of detecting a flaw because have accumulated magnetic powder and
Present the image of abnormal fluorescence brightness.
Step S4 ': current defect fluorescent brightness V ' " is added with historic defects fluorescent brightness V
With, i.e. obtain defect fluorescent brightness V, wherein, historic defects fluorescent brightness V according to equation below "
Calculated defect fluorescent brightness V during the flaw detection of the most previous round steel:
"+(1-α) V ', wherein α is the first weight coefficient to V=α V, and value is 0-1.Due to fluorescence
Brightness is vulnerable to interference, it is preferred that the value of the first weight coefficient α is unsuitable excessive, typically
Value is about 0.1 to be advisable.
Step S5 ': according to equation below, calculate the second consumption concentration by defect fluorescent brightness V
ρ2:
ρ2=b (V0-V), wherein, b is fluorescence-magnetic powder consumption coefficient, for calibration value, V0For just
Beginning fluorescent brightness.
Fluorescence-magnetic powder consumption coefficient b and initial fluorescence brightness V0Depend on actually used automatic spy
Hinder system.After changing magnetic flaw detection ink, at initial concentration ρG0Under, fault detection system can obtain best
The mean fluorecence brightness of defect fluoroscopic image, be initial fluorescence brightness V0.Need at magnetic flaw detection ink
When to be changed, i.e. the least concentration ρ of the magnetic flaw detection ink that operating mode allowsG1Under, fault detection system can obtain
To the mean fluorecence brightness of minimum acceptable defect fluoroscopic image be designated as VL, the most permissible
According to formulaObtain fluorescence-magnetic powder consumption coefficient b.
Step S6 ': according to equation below, consume concentration ρ by first1Concentration ρ is consumed with second2Add
Power add and, obtain concentration ρ that magnetic flaw detection ink is consumedc:
ρc=β ρ1+(1-β)ρ2, wherein β is the second weight coefficient, and value is 0-1.Owing to passing through
Round steel surface area calculates magnetic powder and consumes more stable, and calculates magnetic powder by fluorescent brightness and disappear
Consumption is more vulnerable to interference, it is therefore preferred that the value of the second weight coefficient β is more than 0.5.Right
In the applicable cases that the change of round steel specification is little, the value of β can be bigger than normal, such as, take 0.9.
With the initial concentration ρ of magnetic flaw detection ink0Deduct concentration ρ that magnetic flaw detection ink is consumedc, estimated
Particle content ρ, i.e. ρ=ρ0-ρc, wherein, ρ0Before carrying out in flaw detection process, note
The initial concentration of record magnetic flaw detection ink.
Above detailed description of the invention is only the illustrative embodiments of the present invention, it is impossible to be used for limiting
The present invention, protection scope of the present invention is defined by the claims.Those skilled in the art are permissible
In the essence and protection domain of the present invention, the present invention is made various amendment or equivalent,
These amendments or equivalent also should be regarded as being within the scope of the present invention.
Claims (10)
1. a Particle content evaluation method, for the magnetic powder inspection process to round steel, it is special
Levy and be, including recording the initial concentration ρ of described magnetic flaw detection ink before described flaw detection process is carried out0,
Calculate concentration ρ that described magnetic flaw detection ink is consumedc, with the initial concentration ρ of described magnetic flaw detection ink0Deduct institute
State concentration ρ that magnetic flaw detection ink is consumedcObtain described Particle content ρ, i.e. ρ=ρ0-ρc, wherein,
Calculate concentration ρ that described magnetic flaw detection ink is consumedcComprise the steps:
S1. the surface area according to the round steel currently detected a flaw calculates the currently quilt of described magnetic flaw detection ink
The concentration consumed, currently consumes concentration ρ as first1′；
S2. concentration ρ is currently consumed by described first1' consume concentration ρ with the first history1" add and,
Concentration ρ is consumed to first1, i.e. ρ1=ρ1′+ρ1", wherein, described first history consumes concentration ρ1" it is
The flaw detection of previous round steel time concentration ρ that is consumed of calculated described magnetic flaw detection inkc；
S3. concentration ρ is consumed by described first1Concentration ρ being consumed as described magnetic flaw detection inkc。
2. a Particle content evaluation method, for the magnetic powder inspection process to round steel, it is special
Levy and be, including recording the initial concentration ρ of described magnetic flaw detection ink before described flaw detection process is carried out0,
Calculate concentration ρ that described magnetic flaw detection ink is consumedc, with the initial concentration ρ of described magnetic flaw detection ink0Deduct institute
State concentration ρ that magnetic flaw detection ink is consumedcObtain described Particle content ρ, i.e. ρ=ρ0-ρc, wherein,
Calculate concentration ρ that described magnetic flaw detection ink is consumedcComprise the steps:
S1 '. the currently quilt of described magnetic flaw detection ink is calculated according to the surface area of the round steel currently detected a flaw
The concentration consumed, currently consumes concentration ρ as first1′；
S2 '. concentration ρ is currently consumed by described first1' consume concentration ρ with the first history1" add and,
Concentration ρ is consumed to first1, i.e. ρ1=ρ1′+ρ1", wherein, described first history consumes concentration ρ1" it is
The flaw detection of previous round steel time concentration ρ that is consumed of calculated described magnetic flaw detection inkc；
S3 '. with the round steel currently detected a flaw described in ultraviolet source irradiation, with industry collected by camera
The defect fluoroscopic image of this round steel, calculates the mean fluorecence brightness of described defect fluoroscopic image, makees
For current defect fluorescent brightness V '；
S4 '. by described current defect fluorescent brightness V ' and historic defects fluorescent brightness V " add and, must
To defect fluorescent brightness V, wherein, described historic defects fluorescent brightness V " the most previous round steel
Calculated described defect fluorescent brightness V during flaw detection；
S5 '. the concentration being consumed of described magnetic flaw detection ink is calculated by described defect fluorescent brightness V,
Concentration ρ is consumed as second2；
S6 '. consume concentration ρ by described first1Concentration ρ is consumed with described second2Add and, obtain institute
State concentration ρ that magnetic flaw detection ink is consumedc。
Particle content evaluation method the most according to claim 1 and 2, it is characterised in that
Described first currently consumes concentration ρ1' calculate according to equation below:
ρ1'=a π DL, wherein, a is area-magnetic powder consumption coefficient, D and L is the most just being respectively
Diameter and length at the round steel detected a flaw.
Particle content evaluation method the most according to claim 2, it is characterised in that institute
State current defect fluorescent brightness V ' to calculate according to equation below:
Wherein, C is the number of the pixel of described defect fluoroscopic image, ViFor institute
State the brightness of each pixel of defect fluoroscopic image.
Particle content evaluation method the most according to claim 2, it is characterised in that institute
State and described current defect fluorescent brightness V ' " is added with historic defects fluorescent brightness V and adds for weighting
With, i.e. "+(1-α) V ', wherein α is the first weight coefficient to V=α V, and value is 0-1.
Particle content evaluation method the most according to claim 2, it is characterised in that institute
State the second consumption concentration ρ2Calculate according to equation below:
ρ2=b (V0-V), wherein, b is fluorescence-magnetic powder consumption coefficient, V0For initial fluorescence brightness.
Particle content evaluation method the most according to claim 2, it is characterised in that institute
State and consume concentration ρ by described first1Concentration ρ is consumed with described second2Add and be weighting add and, i.e.
ρc=β ρ1+(1-β)ρ2, wherein β is the second weight coefficient, and value is 0-1.
Particle content evaluation method the most according to claim 5, it is characterised in that institute
Stating the first weight coefficient α is 0.1.
Particle content evaluation method the most according to claim 7, it is characterised in that institute
State the second weight coefficient β > 0.5.
Particle content evaluation method the most according to claim 9, it is characterised in that
Described second weight coefficient β is 0.9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062211A (en) * | 2020-08-04 | 2022-02-18 | 中车沈阳机车车辆有限公司 | Magnetic suspension volume concentration detection method, detection system and magnetic powder flaw detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4879537A (en) * | 1988-07-25 | 1989-11-07 | Rockwell International Corporation | Magnetic suspension and magnetic field concentration using superconductors |
| US6169861B1 (en) * | 1999-10-27 | 2001-01-02 | Xerox Corporation | Feedback toner concentration control for an imaging system |
| CN1712949A (en) * | 2005-07-15 | 2005-12-28 | 曾德文 | Magnetic powder concentration sensor of magnetic suspension |
| CN202886327U (en) * | 2012-08-31 | 2013-04-17 | 爱德森（厦门）电子有限公司 | Device for carrying out online real-time dynamic monitoring on concentration of magnetic suspension |
| CN203455309U (en) * | 2013-06-27 | 2014-02-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Magnetic suspension concentration measuring device for magnetic powder inspection |
-
2015
- 2015-02-13 CN CN201510080220.4A patent/CN105987890B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4879537A (en) * | 1988-07-25 | 1989-11-07 | Rockwell International Corporation | Magnetic suspension and magnetic field concentration using superconductors |
| US6169861B1 (en) * | 1999-10-27 | 2001-01-02 | Xerox Corporation | Feedback toner concentration control for an imaging system |
| CN1712949A (en) * | 2005-07-15 | 2005-12-28 | 曾德文 | Magnetic powder concentration sensor of magnetic suspension |
| CN202886327U (en) * | 2012-08-31 | 2013-04-17 | 爱德森（厦门）电子有限公司 | Device for carrying out online real-time dynamic monitoring on concentration of magnetic suspension |
| CN203455309U (en) * | 2013-06-27 | 2014-02-26 | 南车戚墅堰机车车辆工艺研究所有限公司 | Magnetic suspension concentration measuring device for magnetic powder inspection |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062211A (en) * | 2020-08-04 | 2022-02-18 | 中车沈阳机车车辆有限公司 | Magnetic suspension volume concentration detection method, detection system and magnetic powder flaw detection system |
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