CN209280634U - For detecting the round tangent eddy current probe of deep torn grain - Google Patents
For detecting the round tangent eddy current probe of deep torn grain Download PDFInfo
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- CN209280634U CN209280634U CN201822258182.9U CN201822258182U CN209280634U CN 209280634 U CN209280634 U CN 209280634U CN 201822258182 U CN201822258182 U CN 201822258182U CN 209280634 U CN209280634 U CN 209280634U
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Abstract
The utility model belongs to electromagnetic nondestructive testing field, is related to the round tangent eddy current probe for detecting deep torn grain.The probe includes exciting element, detecting element and fixed frame (9)；The exciting element includes big excitation coil (1), big excitation coil wire spool (6), small excitation coil (2) and small excitation coil wrapping post (7)；The big excitation coil (1) and small excitation coil (2) inscribe；The detecting element includes detection coil support (11), detection coil wrapping post (8), magnetic field shielding plate (5), detection coil (3) and magnetic field shielding cylinder (4)；The magnetic field shielding plate (5), detection coil (3) and magnetic field shielding cylinder (4) are sequentially sleeved on detection coil wrapping post (8), and detection coil (3) is located in the shielding shell that magnetic field shielding plate (5) and magnetic field shielding cylinder (4) are formed.The utility model probe detection depth is big, high-efficient.
Description
Technical field
The utility model belongs to electromagnetic nondestructive testing field, is related to a kind of for nuclear power and other essential industry fields
The eddy current probe of defects detection more particularly, to detects the round tangent eddy current probe of deep torn grain.
Background technique
EDDY CURRENT is one of conventional non-destructive testing technology, is based on electromagnetic induction principle, electromagnetically according to material
The electromechanical detection method for implementing material and component defect detection and performance test can be changed.Eddy current detection method uses excitation
Coil generates gyrate induction alternating current in test specimen, judged by the variation of the voltage signal of coil defect position and
Size.The method has the characteristics that advantage that is non-contact, detecting the quantitative aspect of fireballing and checking, is a kind of pair of surface and nearly table
Planar defect carries out the effective ways of quantitative Nondestructive Evaluation.Eddy current detection method is widely used in for petrochemical industry, electric power metallurgy
Etc. the key areas such as industries and aerospace, nuclear power generating equipment.
Conventional vortex detection at present rests essentially within the detection of nearly cosmetic bug, because there are apparent kelvin effect, whirlpool
Stream is limited in conductive surface and near surface, so limited to deeper defect in equipment part and deep zone defect recognition capability.
The standard osmotic depth of vortex refers to the depth of the material when the vortex density in material reaches the 37% of material surface vortex density
Degree.Restrict vortex penetration depth because being known as driving frequency, exciting current size and electromagnetic property of material etc..Increase vortex
The penetration capacity of probe is frequently with low-frequency excitation, far-field eddy and impulse eddy current.Although by measures such as optimization driving frequencies,
The detection effect to deep torn grain can be improved to a certain extent, but exists simultaneously other problems, such as: using low-frequency excitation and far
Although the energy that vortex can increase vortex penetration depth, improve probe detection deep zone defect, will lead to probe resolution ratio simultaneously
It is low, signal-to-noise ratio is low, detection speed it is low, and caused probe speed effect and detection signal resolution it is difficult the problems such as；Using arteries and veins
Punching vortex detects defect using multiple-frequency signal, has some superiority relative to traditional EDDY CURRENT, but impulse eddy current signal is producing
In raw, transmission and receive process, noise pollution will receive, used Hall element sensitivity is not high, and resolution ratio is vulnerable to offset
Amount and influence of noise.
Although conventional uniform eddy current probe solves the problems such as resolution ratio is low, signal-to-noise ratio is low, but still can not get rid of collection skin effect
The limitation answered, the crack depth that can be detected is limited, ideal as a result, and being used to that still can not obtain compared with deep torn grain
Form excitation coil incude the vortex generated in the material there is directionality, be easy to split to being parallel to vortex flow direction
Line generates missing inspection.
To sum up, main problem of the existing technology has: (1) being vortexed penetration depth mistake caused by conventional vortex probe
It is small, the problem of deep torn grain detects signal can not be obtained；(2) the detection signal of material deep zone defect is smaller, makes an uproar vulnerable to excitation field
The problem of acoustic jamming；(3) coil dimension of conventional deep torn grain detection probe is excessive；(4) uniform turbulence probe is quick to direction of check
The problem of sense.
Therefore, it studies the deep torn grain that can effectively identify in metal material, be suitable for nuclear power generating equipment and other essential industries neck
The eddy current probe of domain large thick-wall component defects detection is ensureing equipment safety operation, evaluation equipment life, is reducing equipment
Maintenance cost etc. is of great significance and prospect.
Utility model content
For overcome the deficiencies in the prior art, above-mentioned problems of the prior art, the purpose of this utility model are solved
It is to provide a kind of round tangent deep torn grain eddy current probe, the circular coil to differ in size using three is by tangent relation
Arrangement, two of them excitation coil inscribe, and the reversed alternating current of same frequency is each led into two excitation coils, in material
Reversed alternation vortex is generated in material.By adjusting the size and phase of exciting current, the vortex of material surface is made to be superposed to zero,
Material internal vortex density becomes larger, to achieve the purpose that increase penetration depth, obtain material internal deep torn grain tiny signal.With
The prior arts such as low-frequency excitation, far-field eddy are compared, and the utility model can effectively improve the detection depth of crackle, at the same have compared with
High-resolution and higher detection speed, the on-line checking of the deep torn grain and deep zone defect that can be used in metal material and quantitative,
Accurately and reliably foundation is provided for the quantitative detection and assessment of industrial equipment and product.
The technical solution adopted in the utility model is: for detecting the round tangent eddy current probe of deep torn grain, including swashing
Encourage element, detecting element and fixed frame；The fixed frame includes scanning frame interconnecting piece and element mounting portion, is set on element mounting portion
It is equipped with element mounting surface；It is characterized by: the exciting element includes big excitation coil, big excitation coil wire spool, small excitation
Coil and small excitation coil wrapping post；The big excitation coil wire spool is fixedly mounted on the element mounting surface of element mounting portion
On；The small excitation coil wrapping post is fixedly mounted on big excitation coil wire spool top end face, the two outer rim inscribe；Big excitation
Coil winding is on big excitation coil wire spool, and small excitation coil is wound on small excitation coil wrapping post, outside small excitation coil
The outer rim inscribe of edge and big excitation coil；
The detecting element is mounted on beside exciting element, including detection coil support, detection coil wrapping post, magnetic field screen
Shield plate, detection coil and magnetic field shielding cylinder；The detection coil support is fixedly mounted on the element mounting surface of element mounting portion
On, detection coil wrapping post is fixedly mounted on detection coil support；The magnetic field shielding plate is a circular piece, and center offers
The through-hole passed through for detection coil wrapping post；The magnetic field shielding cylinder is the cylinder of both ends open；The magnetic field shielding plate, detection line
Circle and magnetic field shielding cylinder are sequentially sleeved on detection coil wrapping post, and detection coil is located at magnetic field shielding plate and magnetic field shielding cylinder is formed
Shielding shell in.
Further, the big excitation coil wire spool, small excitation coil wrapping post and the detection coil wrapping post are mutual
In parallel, axial line is in the same plane.
Further, the big excitation coil, small excitation coil and detection coil are circular vortex coil；
The diameter of the big excitation coil is greater than the diameter of small excitation coil, and the diameter of small excitation coil is greater than detection coil
Diameter.
Further, the diameter of the big excitation coil wire spool and small excitation coil wrapping post is all larger than the detection coil
The diameter of wrapping post.
Further, the big excitation coil and small excitation coil cover completely respectively in big excitation coil wire spool and small excitation
On coil-winding column, with the relative positional relationship for keeping big excitation coil and small excitation coil to fix in the detection process；
The detection coil is covered completely on detection coil wrapping post, top end face and detection line far from fixed frame one end
Wrapping post top end face is enclosed to keep in the same plane, with the relative positional relationship for keeping detection coil to fix in the detection process；
The small excitation coil and detection coil wrapping post are kept in the same plane far from the top end face of fixed frame one end.
Further, the sinusoidal alternating current that frequency is identical, size of current is different, phase is different is respectively adopted to swash greatly to described
It encourages coil and small excitation coil is motivated, to generate the vortex with larger penetration capacity in the material.
Further, the magnetic field shielding cylinder, detection coil and magnetic field shielding plate center are located on same axis.
Further, it is provided with mounting hole on the scanning frame interconnecting piece of the fixed frame, for by the detection deep torn grain
Round tangent eddy current probe integral installation is on scanning frame.
It is further preferred that the mounting hole has multiple, it is symmetrically distributed on scanning frame interconnecting piece.
Further, the big excitation coil wire spool, small excitation coil wrapping post, detection coil wrapping post and fixed frame are equal
It is made of PVC material.
Further, the big excitation coil, small excitation coil and detection coil are formed by enameled wire coiling.
Further, the fixed frame is in T font；The T font horizontal component is element mounting portion, the T font water
Flat operative tip face is element mounting surface, and the T font vertical portion is scanning frame interconnecting piece.
The assembly method of the round tangent eddy current probe described in the utility model for being used to detect deep torn grain are as follows:
Firstly, installation exciting element.First big excitation coil wire spool is fixedly mounted on the element mounting surface of fixed frame,
Small excitation coil wrapping post is fixedly mounted on big excitation coil wire spool top end face again, makes the two outer rim inscribe；It again will be big
Excitation coil is wound on big excitation coil wire spool, and small excitation coil is wound on small excitation coil wrapping post, is made small sharp
Encourage the outer rim inscribe of coil outer rim Yu big excitation coil.
Secondly, installation detecting element.First magnetic field shielding plate is mounted on detection coil wrapping post, then will test coil around
On detection coil wrapping post, then magnetic field shielding cylinder is covered in detection coil periphery, makes detection coil bottom end and radial outer periphery
It is surrounded by the shielding shell that magnetic field shielding plate, magnetic field shielding cylinder are formed, and makes magnetic field shielding plate, magnetic field shielding cylinder and detection coil
Keep coaxial；Then the bottom end that will test coil-winding column is mounted on detection coil support, then be will test coil support and fixed
It is mounted on fixed frame, is located at beside big excitation coil wire spool, and make detection coil far from the top of fixed frame one end
The top end face of face and detection coil wrapping post, small excitation coil and small excitation coil wrapping post is in the same horizontal plane.
After coil winding, entire probe is mounted on scanning frame by mounting hole for third.
Based on above scheme, another technical solution that the utility model uses is: a kind of to utilize above-mentioned detection deep torn grain
Round tangent eddy current probe method that deep torn grain is detected, which comprises the following steps:
S1. it probe assembly: is assembled according to the above method；
S2. the lead of big excitation coil and small excitation coil is respectively connected to two AC power sources, will test coil
Coil lead is connected to oscillograph；
S3. it is continually fed into that frequency is identical, size of current is different, phase is different into big excitation coil and small excitation coil
Steady-state sine alternating current motivated；
S4. probe is made to carry out scanning on material for test surface；When scanning, make detection coil be located at scanning direction most before
Side, small excitation coil and the linear arrangement of detection coil and scanning path are conllinear, carry out scanning along scanning path.Fault location
Disturbance of the vortex field by defect is fed back defect information into detection coil by disturbed magnetic field；
S5. the detection signal that will test in coil is input in oscillograph；
S6. the voltage signal size that oscillograph detection coil obtained measures is compared with calibration curve, is can be obtained
The actual depth of defect.
Further, the size of the big excitation coil are as follows: outer radius Ro1=16mm, inside radius Ri1=14mm, height H1=
1.6mm；The size of the small excitation coil are as follows: outer radius Ro2=3.2mm, inside radius Ri2=1.2mm, height H2=1.6mm；
The center of big excitation coil and small excitation coil is away from S1,2The center of=12mm, small excitation coil and detection coil away from
S2,3=6.45mm；The basic size of the detection coil are as follows: outer radius ro3=1.6mm, inside radius ri3=0.6mm, height hC3=
0.8mm；Wherein, S1,2It is the center of big excitation coil and small excitation coil away from S2,3For in small excitation coil and detection coil
The heart away from；The center of big excitation coil and small excitation coil away from and small excitation coil and detection coil center away from practical new to this
The detection performance for the round tangent eddy current probe that type is used to detect deep torn grain plays an important role, and directly affects the knot of deep torn grain
Fruit keeps suitable distance that can effectively improve probe to the detection depth of crackle.
Further, electric current I in small excitation coil2With electric current I in big excitation coil1Ratio be I2/I1=5-8, phase difference
For 130-180 degree.
The main configuration parameters of probe include the excitation of coil dimension, center away from, driving frequency and two excitation coils
Size of current ratio and phase difference.The size of two excitation coils in the utility model, center away from and driving frequency, exciting current
Size and phase directly affect the size that penetration depth is vortexed in material.When the size of two excitation coils and center are away from certain
When, by adjusting driving frequency, the size and phase difference of exciting current, can reach makes material surface vortex density zero,
Improve the effect of vortex penetration depth.The utility model be first given coil size, hub of a spool away from, then calculate two excitation
The material surface vortex density that coil generates at detection coil position, according to the size of the two vortex densities, by limited
The size of exciting current in corresponding two excitation coils is calculated in meta software.
It is experimentally confirmed, the centers of two round excitation coils is away from for S1,2=12mm, small excitation coil and detection coil
Center away from for S2,3When=6.45mm, size of current is 5-8 times of size of current in big excitation coil, phase in small excitation coil
Difference is maintained at 130-180 degree, and preferable detection effect can be obtained to deep defects.
The principles of the present invention are:
The utility model is in order to increase vortex penetration depth, and using two diameters, equal circular coil is not used as excitation
Source each leads into the size identical frequency sinusoidal excitation current different with phase in two excitation coils, on the surface of the material and
The vortex that induced inside is contrary out, distribution is different.And by the way that excitation parameters appropriate are arranged, make the vortex etc. of material surface
Value is reversed, stack result zero, to make the vortex density of material internal depths is opposite to become larger.Deep torn grain in material is to material
Internal vortex generates disturbance, and the vortex field of disturbance generates induced current by secondary secondary magnetic field in detection coil, influences
The voltage swing of detection coil.The difference of detection coil voltage signal and calibration curve are compared when by general, whether there are cracks, i.e.,
The position of deep torn grain, size in material can be determined.
The utility model has the beneficial effects that
1, the utility model uses the circular vortex coil insensitive to direction as excitation coil, in actually detected process
In, overcome the vortex of form excitation coil generation to crackle orientation-sensitive and be not easy detection be vortexed that flow direction is parallel splits
The problem of line defect, thus the occurrence of effective Crack prevention missing inspection.
2, the utility model improves the sensitivity of detection coil, adopts to eliminate interference of the excitation field to detection signal
Circle detection coil bottom and radial outer periphery are shielded with magnetic field shielding plate and magnetic field shielding cylinder.
3, the round tangent eddy current probe for being used to detect deep torn grain of the utility model, high resolution, sensitivity is good, examines
Degree of testing the speed is fast, and detection efficiency is high, solves following problems existing in the prior art: material for test surface eddy kelvin effect shadow
The problem of ringing deep torn grain defects detection；The problem of detection signal is too small inside test specimen, can't detect internal flaw；Vortex infiltration is deep
Spend small, the eddy current probe problem low to the detectability of deep torn grain.
4, the utility model circle tangent eddy current probe investigation depth is big.Experiment shows under certain driving frequency, incites somebody to action
Size of current ratio is maintained at 5-8 times in small excitation coil and big excitation coil in the utility model, and phase difference is maintained at 130-
It can reach optimum detection effect when 180 degree, on the basis of vortex density peak value, the utility model circle tangent eddy current probe
Penetration depth can reach 2.3 times of typical round eddy current probe or so, up to 26mm.
Detailed description of the invention
Fig. 1 is circle tangent eddy current probe installation diagram described in the utility model embodiment 1；
Fig. 2 is circle tangent eddy current probe crackle scanning conceptual scheme described in the utility model embodiment 2；
Fig. 3 is circle tangent eddy current probe described in the utility model embodiment 3 and typical round eddy current probe in 1kHz
The normalization result of vortex density and the linear relationship comparison diagram of penetration depth when driving frequency motivates；
Fig. 4 is circle tangent eddy current probe described in the utility model embodiment 4 and typical round eddy current probe in 5kHz
The normalization result of vortex density and the linear relationship comparison diagram of penetration depth when driving frequency motivates；
Components, position and number in figure:
The big excitation coil of 1-；The small excitation coil of 2-；3- detection coil；4- magnetic field shielding cylinder；5- magnetic field shielding plate；6- swashs greatly
Encourage coil-winding disk；The small excitation coil wrapping post of 7-；8- detection coil wrapping post；9- fixed frame；91- scanning frame interconnecting piece；92-
Element mounting portion；921- element mounting surface；10- mounting hole；11- detection coil support.
Specific embodiment
The technical solution of the utility model is described in detail with reference to the accompanying drawing, but the content of the utility model is not
It is confined to this.
Embodiment 1:
As shown in Figure 1, for detecting the round tangent eddy current probe of deep torn grain, including exciting element, detecting element and
Fixed frame 9；The fixed frame 9 includes scanning frame interconnecting piece 91 and element mounting portion 92, is provided with element on element mounting portion 92
Mounting surface 921；It is characterized by: the exciting element includes big excitation coil 1, big excitation coil wire spool 6, small excitation coil
2 and small excitation coil wrapping post 7；The big excitation coil wire spool 6 is fixedly mounted on the element mounting surface of element mounting portion 92
On 921；The small excitation coil wrapping post 7 is fixedly mounted on big 6 top end face of excitation coil wire spool, the two outer rim inscribe；
Big 1 set of excitation coil on big excitation coil wire spool 6,2 sets of small excitation coil on small excitation coil wrapping post 7, small excitation
The outer rim inscribe of 2 outer rim of coil and big excitation coil 1；
The detecting element is mounted on beside exciting element, including detection coil support 11, detection coil wrapping post 8, magnetic
Field barricade 5, detection coil 3 and magnetic field shielding cylinder 4；The detection coil support 11 is fixedly mounted on element mounting portion 92
On element mounting surface 921, detection coil wrapping post 8 is fixedly mounted on detection coil support 11；The magnetic field shielding plate 5 is one
Center offers the circular piece of the through-hole passed through for detection coil wrapping post 8；The magnetic field shielding cylinder 4 is the cylinder of both ends open；
The magnetic field shielding plate 5, detection coil 3 and magnetic field shielding cylinder 4 are sequentially sleeved on detection coil wrapping post 8, and detection coil 3 is located at
In the shielding shell that magnetic field shielding plate 5 and magnetic field shielding cylinder 4 are formed.
The big excitation coil wire spool 6, small excitation coil wrapping post 7 and the detection coil wrapping post 8 are parallel to each other,
Its axial line is in the same plane.
The big excitation coil 1, small excitation coil 2 and detection coil 3 are circular vortex coil；
The diameter of the big excitation coil 1 is greater than the diameter of small excitation coil 2, and the diameter of small excitation coil 2 is greater than detection
The diameter of coil 3；
The diameter of the big excitation coil wire spool 6 and small excitation coil wrapping post 7 is all larger than the detection coil coiling
The diameter of column 8.
The big excitation coil 1 and small excitation coil 2 cover completely respectively in big excitation coil wire spool 6 and small excitation coil
On wrapping post 7, with the relative positional relationship for keeping big excitation coil 1 and small excitation coil 2 to fix in the detection process；
The detection coil 3 is covered completely on detection coil wrapping post 8, top end face and inspection far from 9 one end of fixed frame
8 top end face of test coil wrapping post is kept in the same plane, with the relative position for keeping detection coil 3 to fix in the detection process
Relationship.
The small excitation coil 2 is maintained at same plane far from the top end face of 9 one end of fixed frame with detection coil wrapping post 8
It is interior.
Frequency is identical, size of current is different, phase is different sinusoidal alternating current is respectively adopted to the big excitation coil 1
It is motivated with small excitation coil 2, to generate the vortex with larger penetration capacity in the material.
The magnetic field shielding cylinder 4, detection coil 3 and 5 center of magnetic field shielding plate are located on same axis.
Be provided with mounting hole 10 on the scanning frame interconnecting piece 91 of the fixed frame 9, for by it is described detection deep torn grain circle
Shape tangent eddy current probe integral installation is on scanning frame.
The mounting hole 10 has 2, is symmetrically distributed on scanning frame interconnecting piece 91.
The big excitation coil wire spool 6, small excitation coil wrapping post 7, detection coil wrapping post 8 and fixed frame 9 by
PVC material is made.
The big excitation coil 1, small excitation coil 2 and detection coil 3 are formed by enameled wire coiling.
The fixed frame 9 is in T font；The T font horizontal component is element mounting portion 92, the T font horizontal part
Dividing top end face is element mounting surface 921, and the T font vertical portion is scanning frame interconnecting piece 91.
Installation diagram as obtained by embodiment 1 for round tangent eddy current probe, is shown in Fig. 1.
Embodiment 2:
As shown in Fig. 2, on the basis of embodiment 1, it is a kind of to utilize the above-mentioned round tangent whirlpool for being used to detect deep torn grain
The method that stream probe detects deep torn grain defect, it is characterised in that: the following steps are included:
S1. it probe assembly: operates as follows:
Firstly, installation exciting element.Big excitation coil wire spool 6 is first fixedly mounted on to the element mounting surface of fixed frame 9
On 921, then small excitation coil wrapping post 7 is fixedly mounted on big 6 top end face of excitation coil wire spool, both made in outer rim
It cuts；Again by 1 set of big excitation coil on big excitation coil wire spool 6, by 2 sets of small excitation coil in small excitation coil wrapping post 7
On, make the outer rim inscribe of small 2 outer rim of excitation coil and big excitation coil 1.
Secondly, installation detecting element.First magnetic field shielding plate 5 is mounted on detection coil wrapping post 8, then will test coil
3 are wound on detection coil wrapping post 8, then make 3 bottom end of detection coil and diameter in 3 periphery of detection coil for 4 sets of magnetic field shielding cylinder
The shielding shell formed to the periphery by magnetic field shielding plate 5 and magnetic field shielding cylinder 4 surrounds, and makes magnetic field shielding plate 5, magnetic field shielding cylinder
4 and detection coil 3 keep coaxial；Then the bottom end that will test coil-winding column 8 is mounted on detection coil support 11, then will inspection
Test coil support 11 is fixedly mounted on fixed frame 9, is located at big 6 side of excitation coil wire spool, and keep detection coil 3 remote
The top end face of top end face and detection coil wrapping post 8, small excitation coil 2 and small excitation coil wrapping post 7 from 9 one end of fixed frame
In the same horizontal plane.
Third, after coil winding, entire probe is mounted on scanning frame by mounting hole 10.
S2. the lead of big excitation coil 1 and small excitation coil 2 is respectively connected to two AC power sources, will test coil
3 coil lead is connected to oscillograph；
S3. it is continually fed into that frequency is identical, of different sizes, phase is different into big excitation coil 1 and small excitation coil 2
Steady-state sine alternating current is motivated；
S4. scanning frame is controlled, detecting element is made to carry out scanning on material for test surface；When scanning, as shown in Fig. 2, making to examine
Test coil 3 is located at the forefront in scanning direction, small excitation coil 2 and the linear arrangement of detection coil 3 and scanning path is conllinear,
Scanning is carried out along scanning path.Disturbance of the vortex field of fault location by defect is arrived defect information feedback by disturbed magnetic field
In detection coil 3；
S5. the detection signal that will test in coil 3 is input in oscillograph；
S6. the calibration curve of the voltage signal size of oscillograph detection coil 3 obtained and standard specimen is compared,
I.e. it can be inferred that the depth of defect.
Embodiment 3:
For verify the utility model for detect the round tangent eddy current probe of deep torn grain to heavy wall deep torn grain defect into
Penetration depth when row detection is better than typical round eddy current probe, on the basis of Examples 1 and 2, with 304 austenitic stainless steels
Test specimen is used to detect the round tangent eddy current probe of deep torn grain using the utility model and does not install small excitation coil 2 and inspection
Test coil 3 only installs big excitation coil 1 and is used for typical round eddy current probe obtained from excitation and defects detection, presses
Following parameter configuration and method detection, with 1kHz driving frequency, compare experiment.
1, traditional internal loopback formula circular vortex probe test experience.
A. on the basis of Examples 1 and 2, big excitation coil 1 is only installed and is used for excitation and defects detection, is pressed
Following configuration and method are tested.
B. typical round eddy current probe configures:
1 basic size of big excitation coil used, driving frequency, exciting current size are specific as follows:
B1. big 1 basic size of excitation coil: outer radius Ro1=16mm, inside radius Ri1=14mm, height H1=1.6mm；
B2. driving frequency:f=1kHz；
B3. exciting current:I=1A。
C. detection method:
Frequency is inputted into big excitation coil 1f=1kHz, electric currentI 1The steady-state sine exciting current of=1A, using with installation
Identical method is tested when big excitation coil 1 is with small excitation coil 2.
D. result:
The normalization result of vortex density of the gained typical round eddy current probe when 1kHz driving frequency motivates in test specimen
With the linear relationship of penetration depth, Fig. 3 is seen；It can be obtained by curve corresponding in Fig. 3, typical round whirlpool when 1kHz unifrequency motivates
The penetration depth of stream probe is 11.2mm.
2, the utility model is used to detect the round tangent eddy current probe test experience of deep torn grain.
A. on the basis of Examples 1 and 2, the round tangent eddy current probe for detecting deep torn grain is assembled.
B. for detecting the round tangent eddy current probe configuration of deep torn grain:
B1. excitation coil basic size
Big excitation coil 1: outer radius Ro1=16mm, inside radius Ri1=14mm, height H1=1.6mm；
Small excitation coil 2: outer radius Ro2=3.2mm, inside radius Ri2=1.2mm, height H2=1.6mm；
B2. driving frequency:f=1kHz；
B3. exciting current size:I 1=1A, I 2=7.57A, exciting current phase difference: Δ φ=167.8 °
B4. the center of big excitation coil 1 and small excitation coil 2 is away from S1,2=12mm, small excitation coil 2 and detection coil 3
Center away from S2,3=6.45mm；
B5. 3 basic size of detection coil: outer radius ro3=1.6mm, inside radius ri3=0.6mm, height hC3=0.8mm；
B6. 4 basic size of magnetic field shielding cylinder: outer radius ro4=1.8mm, inside radius ri4=1.6mm, height hC4=
0.8mm；
B7. 5 basic size of magnetic field shielding plate: outer radius ro5=1.8mm, thickness deltat t5=0.2mm。
C. detection method:
Frequency is inputted into big excitation coil 1f=1kHz, electric currentI 1Frequency is inputted in=1A and small excitation coil 2f=1kHz、
Electric currentI 2 =The steady-state sine exciting current of 7.57A, exciting current phase difference: Δ φ=167.8o, using 2 the method for embodiment
It is tested.
D. result:
By the gained of embodiment 3 round tangent eddy current probe, when 1kHz driving frequency motivates, vortex density is returned in test specimen
One changes the linear relationship of result and penetration depth, sees Fig. 3；It can be obtained by curve corresponding in Fig. 3, circle when 1kHz unifrequency motivates
The penetration depth of shape tangent eddy current probe is 26.3mm.
3, the utility model circle tangent eddy current probe and traditional internal loopback formula circular vortex probe testing result pair
Than:
Penetration depth and tradition of the utility model circle tangent eddy current probe when 1kHz driving frequency motivates are spontaneous
The comparison of self-bring in type circular vortex probe resulting penetration depth when 1kHz driving frequency motivates respectively, is shown in Table 1.
Table 1
It can be seen from the above result that the penetration depth of the utility model circle tangent eddy current probe can reach 26.3mm, and
Typical round eddy current probe is only capable of reaching 11.2mm, the former is 2.35 times of the latter.
Embodiment 4:
To verify for detecting when the round tangent eddy current probe of deep torn grain detects heavy wall deep torn grain defect
Penetration depth is better than typical round eddy current probe, on the basis of Examples 1 and 2, with 304 austenitic stainless steel test specimens, uses
The utility model is used to detect the round tangent eddy current probe of deep torn grain and does not install small excitation coil 2 and detection coil 3, only
Big excitation coil 1 is installed and is used for typical round eddy current probe obtained from excitation and defects detection, and by following configuration
And method compares experiment with 5kHz driving frequency.
1, traditional internal loopback formula circular vortex probe test experience.
A. on the basis of Examples 1 and 2, big excitation coil 1 is only installed and is used for excitation and defects detection, is pressed
Following configuration and method are tested.
B. typical round eddy current probe configures:
1 basic size of excitation coil used, driving frequency, exciting current size are specific as follows:
B1. big 1 basic size of excitation coil: outer radius Ro1=11.2mm, inside radius Ri1=9.2mm, height H1=
1.6mm；
B2. driving frequency:f=5kHz；
B3. exciting current:I=1A。
C. detection method:
Frequency is inputted into big excitation coil 1f=5kHz, electric currentIThe steady-state sine exciting current of=1A, using big with installation
Excitation coil 1, small excitation coil 2 method identical with when detection coil 3 are tested.
D. result:
The normalization result of vortex density of the gained typical round eddy current probe when 5kHz driving frequency motivates in test specimen
With the linear relationship of penetration depth, Fig. 4 is seen；It can be obtained by curve corresponding in Fig. 4, typical round whirlpool when 5kHz unifrequency motivates
The penetration depth of stream probe is 8.3mm.
2, the utility model is used to detect the round tangent eddy current probe test experience of deep torn grain.
A. on the basis of Examples 1 and 2, the round tangent eddy current probe for detecting deep torn grain is assembled.
B. for detecting the round tangent eddy current probe configuration of deep torn grain:
B1. excitation coil basic size
Big excitation coil 1: outer radius Ro1=11.2mm, inside radius Ri1=9.2mm, height H1=1.6mm；
Small excitation coil 2: outer radius Ro2=3.2mm, inside radius Ri2=1.2mm, height H2=1.6mm；
B2. driving frequency:f=5kHz；
B3. exciting current size:I 1=1A, I 2=6.2A, exciting current phase difference: Δ φ=166.4 °
B4. the center of big excitation coil 1 and small excitation coil 2 is away from S1,2=28mm, small excitation coil 2 and detection coil 3
Center away from S2,3=6.45mm；
B5. 3 basic size of detection coil: outer radius ro3=1.6mm, inside radius ri3=0.6mm, height hC3=0.8mm；
B6. 4 basic size of magnetic field shielding cylinder: outer radius ro4=1.8mm, inside radius ri4=1.6mm, height hC4=
0.8mm；
B7. 5 basic size of magnetic field shielding plate: outer radius ro5=1.8mm, thickness deltat t5=0.2mm。
C. detection method:
Frequency is inputted into big excitation coil 1f=5kHz, electric currentI 1Frequency is inputted in=1A and small excitation coil 2f=5kHz、
Electric currentI 2The steady-state sine exciting current of=6.2A, exciting current phase difference: Δ φ=166.4o, using 2 the method for embodiment
It is tested.
D. result:
By the gained of embodiment 4 round tangent eddy current probe, when 5kHz driving frequency motivates, vortex density is returned in test specimen
One changes the linear relationship of result and penetration depth, sees Fig. 4；It can be obtained by curve corresponding in Fig. 4, circle when 5kHz unifrequency motivates
The penetration depth of shape tangent eddy current probe is 17.6mm.
3, the utility model circle tangent eddy current probe and traditional internal loopback formula circular vortex probe testing result pair
Than.
Penetration depth and tradition of the utility model circle tangent eddy current probe when 5kHz driving frequency motivates are spontaneous
The comparison of self-bring in type circular vortex probe resulting penetration depth when 5kHz driving frequency motivates respectively, is shown in Table 2.
Table 2
It can be seen from the above result that the utility model attainable penetration depth of circle tangent eddy current probe is 17.6mm,
And the attainable penetration depth of typical round eddy current probe is 8.3mm, the former is 2.12 times of the latter.
The above is only the preferred embodiment of the utility model, not to limit the interest field of the utility model.
Technical solution that any interest field for being covered with the application the scope of the patents is implemented any is familiar with those skilled in the art
Member, the scheme of many possible changes and modifications is made using the method content of the disclosure above, belongs to the guarantor of the utility model
Protect range.
Claims (10)
1. the round tangent eddy current probe for detecting deep torn grain, including exciting element, detecting element and fixed frame (9)；Institute
Stating fixed frame (9) includes scanning frame interconnecting piece (91) and element mounting portion (92), and element peace is provided on element mounting portion (92)
Dress face (921)；It is characterized by: the exciting element includes big excitation coil (1), big excitation coil wire spool (6), small excitation
Coil (2) and small excitation coil wrapping post (7)；The big excitation coil wire spool (6) is fixedly mounted on element mounting portion (92)
Element mounting surface (921) on；The small excitation coil wrapping post (7) is fixedly mounted on big excitation coil wire spool (6) top
On face, the two outer rim inscribe；Big excitation coil (1) covers on big excitation coil wire spool (6), and small excitation coil (2) covers small
On excitation coil wrapping post (7), the outer rim inscribe of small excitation coil (2) outer rim and big excitation coil (1)；
The detecting element is mounted on beside exciting element, including detection coil support (11), detection coil wrapping post (8), magnetic
Field barricade (5), detection coil (3) and magnetic field shielding cylinder (4)；The detection coil support (11) is fixedly mounted on element peace
On the element mounting surface (921) in dress portion (92), detection coil wrapping post (8) is fixedly mounted on detection coil support (11)；Institute
Stating magnetic field shielding plate (5) is a circular piece, and center offers the through-hole passed through for detection coil wrapping post (8)；The magnetic field screen
Cover the cylinder that cylinder (4) are both ends open；The magnetic field shielding plate (5), detection coil (3) and magnetic field shielding cylinder (4) are sequentially sleeved in inspection
On test coil wrapping post (8), detection coil (3) is located at the shielding shell that magnetic field shielding plate (5) and magnetic field shielding cylinder (4) are formed
It is interior.
2. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described big sharp
It encourages coil-winding disk (6), small excitation coil wrapping post (7) and the detection coil wrapping post (8) to be parallel to each other, axial line position
In in same plane.
3. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described big sharp
Encouraging coil (1), small excitation coil (2) and detection coil (3) is circular vortex coil；
The diameter of the small excitation coil (2) is greater than the diameter of detection coil (3)；
The diameter of the big excitation coil wire spool (6) and small excitation coil wrapping post (7) is all larger than the detection coil coiling
The diameter of column (8).
4. as claimed in claim 3 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described big sharp
Encourage the size of coil (1) are as follows: outer radius Ro1=16mm, inside radius Ri1=14mm, height H1=1.6mm；The small excitation coil
(2) size are as follows: outer radius Ro2=3.2mm, inside radius Ri2=1.2mm, height H2=1.6mm；
The center of big excitation coil (1) and small excitation coil (2) is away from S1,2=12mm, small excitation coil (2) and detection coil (3)
Center is away from S2,3=6.45mm；The basic size of the detection coil (3) are as follows: outer radius ro3=1.6mm, inside radius ri3 =
0.6mm, height hC3=0.8mm。
5. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: the detection
Coil (3) is covered completely on detection coil wrapping post (8), the top end face far from fixed frame (9) one end and detection coil coiling
Column (8) top end face is kept in the same plane.
6. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described small sharp
Coil (2) and detection coil wrapping post (8) are encouraged to keep in the same plane far from the top end face of fixed frame (9) one end.
7. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: the magnetic field
Shielding cylinder (4), detection coil (3) and magnetic field shielding plate (5) center are located on same axis.
8. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: the fixation
Mounting hole (10) are provided on the scanning frame interconnecting piece (91) of frame (9).
9. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described big sharp
Coil-winding disk (6), small excitation coil wrapping post (7), detection coil wrapping post (8) and fixed frame (9) are encouraged by PVC material system
At；The big excitation coil (1), small excitation coil (2) and detection coil (3) are formed by enameled wire coiling.
10. as described in claim 1 for detecting the round tangent eddy current probe of deep torn grain, it is characterised in that: described solid
Frame (9) are determined in T font；The T font horizontal component is element mounting portion (92), and the T font horizontal component top end face is
For element mounting surface (921), the T font vertical portion is scanning frame interconnecting piece (91).
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| CN109406623A (en) * | 2018-12-30 | 2019-03-01 | 北方民族大学 | For detecting the round tangent eddy current probe and method of deep torn grain |
| CN109406623B (en) * | 2018-12-30 | 2023-09-22 | 北方民族大学 | Circular tangential eddy current probe and method for detecting deep cracks |
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