CN208383813U - It is a kind of for excite pipeline torsion guided wave electromagnet ultrasonic changer - Google Patents
It is a kind of for excite pipeline torsion guided wave electromagnet ultrasonic changer Download PDFInfo
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- CN208383813U CN208383813U CN201820730299.XU CN201820730299U CN208383813U CN 208383813 U CN208383813 U CN 208383813U CN 201820730299 U CN201820730299 U CN 201820730299U CN 208383813 U CN208383813 U CN 208383813U
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- under test
- pipe under
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- guided wave
- clamping device
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Abstract
The utility model belongs to Ultrasonic Nondestructive field, it proposes a kind of for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave, energy converter includes hinge, permanent magnet, scale stud, magnet clamping device, excitation coil, pipe under test and buckle, permanent magnet can be made to be uniformly distributed along pipe under test axial symmetry by magnet clamping device, to be formed in pipe under test along the magnetic field of pipe under test radial direction.It is passed through the pumping signal of bursting along pipe under test axial direction in excitation coil, the torsion guided wave along Propagation can be generated under the action of Lorentz force, in pipe under test.The utility model can be widely applied to linear measure longimetry and damage and the Corrosion monitoring of tubular structure.
Description
Technical field:
The utility model relates to electromagnetic ultrasonic non-destructive detection techniques more particularly to a kind of for exciting pipeline torsion guided wave
Electromagnet ultrasonic changer.
Background technique:
Not only freight volume is big for pipeline transportation, continuous, rapid, economic, safe and reliable, steady and small investment, land occupation less,
Expense is low, and can realize automatic control.Therefore it is widely used in petroleum, natural gas, ore, coal, building materials, chemicals and grain
Deng long-distance transportation.However, with the pipeline work time extension and various environmental factors influence (wind, solarization, under
Rain snows), pipeline inevitably burn into crackle, tired equivalent damage.It is therefore desirable to periodically be good for pipeline
Health situation is detected.Currently used method has: ray detection, Liquid penetrant testing, Magnetic testing and ultrasound examination etc..
The utility model belongs to ultrasonic wave guided wave field of non destructive testing, and Primary Component is electromagnet ultrasonic changer
(Electromagnetic acoustic transducer, abbreviation EMAT).EMAT is the dress of a kind of excitation and reception ultrasonic wave
It sets.The device is not necessarily to acoustic couplant, and structure is simple, excites the ultrasonic wave of various modes with can be convenient, it can be achieved that non-contact, high
Temperature, rapid survey, therefore paid close attention to by researcher.
Electromagnetic acoustic is excited in metallic conductor, usually there are two types of method, one is being based on Lorentz force mechanism, one is
Based on magnetostriction mechanism.Electromagnet ultrasonic changer based on Lorentz force is commonly used in the detection of non-ferromagnetic conductive material,
Generally it is arranged on test specimen to be measured by magnet, excitation coil and test specimen to be measured composition, coil, magnet is arranged on coil.Inspection
When survey, apply pumping signal of bursting in transmitting coil, coil induces the electricity with pumping signal same frequency on test specimen to be measured
Vortex, current vortex generate Lorentz force under the quiescent biasing magnetic fields of magnet in test specimen to be measured, and dynamic Lorentz forces are made
Ultrasonic wave is generated in test specimen to be measured under, the received process of ultrasonic wave is the inverse process of ultrasonic excitation process.
For pipeline, there are the guided waves of three kinds of mode in pipeline configuration: longitudinal mode guided wave (L mode), bending die
State guided wave (F mode), torsion mode guided wave (T mode), as shown in Figure 1, being the phase velocity frequency for the pipeline that a diameter is 76mm
Non-dramatic song line.As can be seen from Figure, there are multistage guided waves, especially mode of flexural vibration for the guided wave of each mode under different driving frequencies
Guided wave, this make detect signal be difficult to.In order to be reduced as far as ejecting ground guided wave order, the utility model is adopted
With the pumping signal of frequency relatively low (50kHz).T is removed from the phase velocities dispersion curve of pipeline as can be seen that in low frequency
Outside (0,1) mode, remaining each rank mode is all frequency dispersion, therefore the utility model selects T (0,1) mode to examine pipeline
It surveys.
Therefore, it is necessory to be improved to the prior art to solve the deficiency of the prior art.
Utility model content:
The utility model is provided a kind of for exciting pipeline to reverse to solve the above-mentioned problems of the prior art
The electromagnet ultrasonic changer and its working method of guided wave, on the basis of traditional electromagnet ultrasonic changer, by designing new magnetic
Iron clamping device so that magnet is circumferentially distributed more uniformly across along pipeline, and then forms more uniform static state in the duct
Bias magnetic field.The excitation that single mode torsion guided wave (T (0,1)) can be achieved, obtain higher signal-to-noise ratio and transducer sensitivity,
Improve the identification of signal.
The utility model adopts the following technical solution: it is a kind of for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave,
Including hinge, permanent magnet, scale stud, magnet clamping device, excitation coil, pipe under test and buckle, the magnet clamping
Device is made of two semicircles with symmetrical structure, and one end of two of them semicircle is connected by hinge, and the other end is by card
Button connection, forms a circle, and magnet clamping device is sheathed on the outside of pipe under test, the axis of magnet clamping device with to test tube
The axis in road is overlapped, and permanent magnet is embedded in the hole of magnet clamping device, and permanent magnet is uniformly distributed along pipe under test axial symmetry, is carved
Degree stud is evenly distributed in the circumferential direction of magnet clamping device, and excitation coil is circumferentially uniformly distributed along pipe under test.
Further, radial direction of the polarization direction of the permanent magnet along pipe under test, and the pole of two neighboring permanent magnet
Change contrary.
Further, tone-burst signal of the pumping signal of the excitation coil access using modulation, the side of electric current
To the axial direction along pipe under test.
Further, the scale stud, hinge, buckle material be nonferromugnetic material.
The utility model also adopts the following technical scheme that a kind of for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave
Working method, comprising the following steps:
Step 1: excitation coil is uniformly distributed in pipe under test；
Step 2: first magnet clamping device card is cramped out, magnet clamping device is set in pipe under test, is then buckled
Buckle；
Step 3: along the axially adjustable magnet clamping device of pipeline, swash the hole face for installing magnet on magnet clamping device
Encourage coil；
Step 4: the scale stud on adjustment clamping device, so that the axis of the axis of magnet clamping device and pipe under test
Line is overlapped；
Step 5: magnet being installed in the mounting hole of magnet clamping device, magnet face excitation coil, adjacent magnets
Polarization direction is on the contrary, the bias magnetic field of magnet is radially distributed；
Step 6: successively signal generator, signal amplifier, excitation coil, filter amplification circuit, signal are adopted with conducting wire
Acquisition means, computer connect；
Step 7: applying pumping signal of bursting in excitation coil, and excitation coil induces current vortex in pipe under test,
Current vortex generates the Lorentz force along pipeline circumferential direction under the action of quiescent biasing magnetic field in pipe under test, in dynamic Lorentz
Torsion guided wave is generated under power effect, in pipe under test.
The utility model has the following beneficial effects: under relatively low driving frequency (50kHz), by adjusting magnet
Scale stud on clamping device so that permanent magnet is uniformly distributed about pipe under test axial symmetry, and then generates single mode
Reverse guided wave T (0,1) mode.The utility model can be widely applied to tubular structure linear measure longimetry and damage and corrosion inspection
It surveys.
Detailed description of the invention:
Fig. 1 is the structure chart for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave.
Fig. 2 is the axial view for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave.
Fig. 3 is the radial view for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave.
Specific embodiment:
The utility model will be further described below with reference to the accompanying drawings.
It includes hinge 1, permanent magnet 2, scale that the utility model, which is used to excite the electromagnet ultrasonic changer of pipeline torsion guided wave,
Stud 3, magnet clamping device 4, excitation coil 5, pipe under test 6 and buckle 7.As shown in figure 3, magnet clamping device 4 is by two
A semicircle composition with symmetrical structure, one end of two of them semicircle are connected by hinge 1, and the other end is connected by buckle 7,
Form a circle.Magnet clamping device 4 is sheathed on 6 outside of pipe under test, the axis and pipe under test 6 of magnet clamping device 4
Axis be overlapped, 12 permanent magnets 2 are embedded in magnet clamping device 4, so that permanent magnet 2 is uniform along 6 axial symmetry of pipe under test
Distribution, 3 scale studs 3 are evenly distributed in the circumferential direction of magnet clamping device 4, and excitation coil 5 is circumferential uniformly along pipe under test 6
Distribution.
12 permanent magnets 2 are uniformly distributed along 6 axial symmetry of pipe under test, and adjacent permanent magnets 2 install polarity on the contrary, generating in turn
Along the equally distributed quiescent biasing magnetic field of 6 axial symmetry of pipe under test, the direction in the magnetic field is mainly along the radial direction of pipe under test 6.Swash
It encourages and is passed through in coil 5 after the axial pumping signal of bursting of pipe under test 6, axial current vortex can be generated in pipe under test 6.
Quiescent biasing magnetic field and current vortex interaction inspire torsion guided wave in pipe under test 6.
The utility model is used to excite the working method of the electromagnet ultrasonic changer of pipeline torsion guided wave, including following step
It is rapid:
Step 1: excitation coil (5) is uniformly distributed on pipe under test (6)；
Step 2: first magnet clamping device card button (7) is opened, magnet clamping device (4) is set to pipe under test (6)
On, then buckle buckle (7)；
Step 3: along the axially adjustable magnet clamping device (7) of pipeline, make the hole that magnet is installed on magnet clamping device (7)
Face excitation coil (5)；
Step 4: adjustment clamping device (4) on scale stud (3) so that the axis of magnet clamping device (4) with it is to be measured
The axis of pipeline (6) is overlapped；
Step 5: magnet (2) is installed in the mounting hole of magnet clamping device (4), magnet face excitation coil (5),
Installation magnet needs to pay attention to: the polarization direction of adjacent magnets is on the contrary, the bias magnetic field of magnet is radially distributed；
Step 6: with conducting wire successively by signal generator, signal amplifier, excitation coil (5), filter amplification circuit, letter
Number acquisition device, computer connect；
Step 7: apply pumping signal of bursting, excitation coil (5) sense in pipe under test (6) in excitation coil (5)
Current vortex should be gone out, current vortex generates the Lorentz along pipeline circumferential direction under the action of quiescent biasing magnetic field in pipe under test (6)
Power generates torsion guided wave under dynamic Lorentz forces effect, in pipe under test (6).
Axial direction of the current direction of excitation coil 5 along pipe under test 6, the expression formula of electric current are as follows:
I=A* (1-cos (2* π * f*t/5)) * cos (2* π * f*t) [A] (t < 5*T)
Wherein, A is the amplitude of electric current, and f is the frequency of exciting current, and t is the action time of exciting current, and T is excitation electricity
The period of stream.
The utility model arrangement mode opposite in the mutual magnetic pole using magnet devises completely new magnet clamping
Device, so that magnet array is uniformly distributed about pipe under test at axial symmetry, the quiescent biasing magnetic field of generation is more uniform, thus
The torsion guided wave T (0,1) of the single mode generated.Since magnet clamping device can be opened and be locked by buckle, side
Just it is installed and is used on the pipeline laid.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
It for art personnel, can also make several improvements without departing from the principle of this utility model, these improvement also should be regarded as
The protection scope of the utility model.
Claims (4)
1. a kind of for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave, it is characterised in that: including hinge (1), permanent magnet
(2), scale stud (3), magnet clamping device (4), excitation coil (5), pipe under test (6) and buckle (7), the magnetic catch
It holds device (4) to be made of two semicircles with symmetrical structure, one end of two of them semicircle is connected by hinge (1), separately
One end forms a circle, magnet clamping device (4) is sheathed on the outside of pipe under test (6), magnet clamping by buckling (7) connection
The axis of device (4) is overlapped with the axis of pipe under test (6), and permanent magnet (2) is embedded in the hole of magnet clamping device (4), forever
Magnet (2) is uniformly distributed along pipe under test (6) axial symmetry, and scale stud (3) is evenly distributed in the week of magnet clamping device (4)
To excitation coil (5) is circumferentially uniformly distributed along pipe under test (6).
2. as described in claim 1 for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave, it is characterised in that: it is described forever
The polarization direction of magnet (2) is along the radial direction of pipe under test (6), and the polarization direction of two neighboring permanent magnet (2) is opposite.
3. as claimed in claim 2 for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave, it is characterised in that: described to swash
Encourage tone-burst signal of the pumping signal of coil (5) access using modulation, axis of the sense of current along pipe under test (6)
To.
4. as described in claim 1 for exciting the electromagnet ultrasonic changer of pipeline torsion guided wave, it is characterised in that: the quarter
It spends stud (3), hinge (1), buckle the material of (7) as nonferromugnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820730299.XU CN208383813U (en) | 2018-05-14 | 2018-05-14 | It is a kind of for excite pipeline torsion guided wave electromagnet ultrasonic changer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820730299.XU CN208383813U (en) | 2018-05-14 | 2018-05-14 | It is a kind of for excite pipeline torsion guided wave electromagnet ultrasonic changer |
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| CN208383813U true CN208383813U (en) | 2019-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776178A (en) * | 2018-05-14 | 2018-11-09 | 南京航空航天大学 | A kind of electromagnet ultrasonic changer and its working method for exciting pipeline torsion guided wave |
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2018
- 2018-05-14 CN CN201820730299.XU patent/CN208383813U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776178A (en) * | 2018-05-14 | 2018-11-09 | 南京航空航天大学 | A kind of electromagnet ultrasonic changer and its working method for exciting pipeline torsion guided wave |
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