CN101231269B - Electromagnetic ultrasonic transducer capable of charging or discharging magnetism for build-in permanent magnet as well as use method - Google Patents
Electromagnetic ultrasonic transducer capable of charging or discharging magnetism for build-in permanent magnet as well as use method Download PDFInfo
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- CN101231269B CN101231269B CN2007100084844A CN200710008484A CN101231269B CN 101231269 B CN101231269 B CN 101231269B CN 2007100084844 A CN2007100084844 A CN 2007100084844A CN 200710008484 A CN200710008484 A CN 200710008484A CN 101231269 B CN101231269 B CN 101231269B
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Abstract
The invention discloses an electromagnetic sonac which can carry out charging magnetism and demagnetization for an internally installed permanent-magnet and a using method thereof, the electromagnetic sonac comprises a permanent-magnet internally installed in a sonac body, and the permanent-magnet is used for providing a stationary magnetic field during the process of realizing electromagnetic ultrasonic inspection and measurement. The invention is characterized in that the sonac also comprises an internally installed charging magnetism-demagnetization device which is arranged in the electromagnetic sonac body and at the peripheral part of the permanent-magnet or an outside installed charging magnetism-demagnetization device which can be positioned at the periphery of the electromagnetic sonac and realize the charging magnetism and the demagnetization for the permanent-magnet. The charging magnetism-demagnetization device is used for charging magnetism before the electromagnetic sonac starts to work, and the charging magnetism-demagnetization device is used for demagnetization after the electromagnetic sonac finishes the work, so in the process of carrying and using the electromagnetic sonac, the defects that the sonac is not convenient to be carried and/or to be used for detecting ferromagnetism workpieces due to the magnetism generated by the permanent-magnet in the sanac body cannot exist.
Description
Technical field
The invention belongs to technical field of nondestructive testing, particularly relate to a kind of electromagnetic ultrasonic transducer and the using method that can fill demagnetization to built-in permanent magnet.
Background technology
Dynamic Non-Destruction Measurement (nondestructive test is called for short NDT) is a kind of examined object body that do not destroy and damage, to its performance, quality, the technology that has or not inherent vice to detect, industrial the most frequently used lossless detection method mainly comprises: Ultrasonic Detection Ultrasonic Testing (abbreviation UT); Ray detection RadiographicTesting (abbreviation RT); Magnetic detects Magnetic particle Testing (abbreviation MT); Penetrating inspection Penetrant Testing (abbreviation PT); EDDY CURRENT Eddy current Testing (abbreviation ET).Ultrasonic Detection (UT) is when utilizing ultrasound wave to propagate in detected material, the acoustic characteristic of material and the variation of interior tissue produce certain influence to hyperacoustic propagation, understand material property and structural change by the detection to ultrasound wave degree of susceptibility and situation.When ultrasound wave entered object and runs into defective, a part of sound wave can produce reflection, and transmitting and receiving device can analyze reflection wave, just can unusually accurately measure defective, and can show the position and the size of inherent vice, measured material thickness etc.Though, ultrasound examination has that penetration power is strong, equipment is light, detect that cost is low, detection efficiency is high, can know testing result (detect in real time) immediately, can realize that robotization detects and realizes HC hard copy, in defects detection to responsive especially or the like the advantage of the bigger crack defect of harmfulness.But, ultrasound examination needs couplant just can make acoustic energy penetrate checking matter usually, and need with reference to evaluation criteria, particularly the testing result of Xian Shiing is not directly perceived, cause technical level of operators is had higher requirements, in addition, complicated for little and thin or shape, and also all also there is certain difficulty in the workpiece sensing of coarse grain material etc., and these have all caused the limitation of ultrasound examination.Therefore, a kind of electromagnetic acoustic detects (EMAT) technology and just more and more has been subjected to people's attention.
Electromagnetic ultrasonic transducer (or being called probe) belongs to a kind of ultrasound emission receiving trap, because have sensor and medium surface noncontact in the process that electromagnetic acoustic produces and receives, need not to add acoustic couplant, good reproducibility, detection speed advantages of higher, electromagnetic ultrasonic transducer has entered the use field more and more.Electromagnetic acoustic detects (EMAT) technology generally can be divided into two kinds of Lorentz force formula and magnetostriction types.Near the ultimate principle of Lorentz force formula: be that the coil that is connected with high-frequency current is placed on the metal object, produce induction current in the metal object, as applying a stabilizing magnetic field at one time, with generation alternation Lorentz force behind the vortex interaction, metallic atom produces double vibrations under the effect of alternation Lorentz force, when blazing abroad in a certain way, vibration just can produce ultrasound wave, the back wash effect process of this process is exactly to utilize EMAT to receive ultrasonic principle, add the size and Orientation of magnetic deflection field by change, the size of high-frequency current and frequency, the shape and size of coil just can be controlled EMAT and produce ultrasonic type, strong and weak, parameter such as the frequency and the direction of propagation also can change the parameters such as bandwidth of operation that receive ultrasonic EMAT simultaneously.The generation of electromagnetic acoustic and reception generally realize by magnetostriction principle in the ferrimagnet, when passing through exchange current in the coil, produce alternating magnetic field, according to magnetostriction principle, because the alternation effect in magnetic field changes the magnetic material volume, thereby form the vibration of material internal, and finally outwards will vibrate and propagate with the sound wave form.In order to form strong stationary magnetic field, in electromagnetic ultrasonic transducer, need be built-in with high strong magnet usually, in the prior art, and the existing employing permanent magnet of high strong magnet, also have and adopt electromagnet.Adopt the electromagnet mode,, make also that whole electromagnetic ultrasonic transducer is bulky and be not easy to carry and use because winding volume is bigger, simultaneously, in testing process, electromagnet need feed big electric current always, both cause the loss of the energy, caused the damage of parts again easily.Adopt the permanent magnet mode, the magnet volume is little, can be so that the one-piece construction of electromagnetic ultrasonic transducer becomes compact, have light characteristics of carrying well, but, because electromagnetic ultrasonic transducer is built-in with permanent magnet, just make electromagnetic ultrasonic transducer (probe) body easily ferromagnetism object on every side be produced suction-operated, such as, instrument carry with use in, will the adsorption operations person entrained on one's body ferromagnetism object of the magnetic of probe is (as bank card, key etc.), thereby the functions of use of influence such as bank card, the magnetic of probe also can adsorption operations person periphery ferromagnetism object (bus door as by bus time the etc.), thereby influence operator's carrying to instrument, and this probe is in being used in the process that ferromagnetic workpiece is detected, and the magnetic owing to probe makes that probe is not easy to from workpiece take off very much especially, thereby caused the electromagnetic ultrasonic transducer of built-in permanent magnet to be not easy to ferromagnetic workpiece is carried out the drawback of Non-Destructive Testing.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of electromagnetic ultrasonic transducer and the using method that can fill demagnetization to built-in permanent magnet is provided, make electromagnetic ultrasonic transducer carry with use in, can not be not easy to carry and/or be not easy to use the drawback that ferromagnetic workpiece is being detected owing to the formed magnetic of the permanent magnet in the sensor body causes sensor.
The technical solution adopted for the present invention to solve the technical problems is: a kind ofly can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet, comprise:
One is built in the intrinsic permanent magnet of electromagnetic ultrasonic transducer, is used for realizing that the electromagnetic acoustic testing process provides a stationary magnetic field;
One is installed in the electromagnetic ultrasonic transducer body and is located at built-in magnetising or demagnetising apparatus around the permanent magnet, is used for realizing described permanent magnet is filled demagnetization.
The mensuration regulating device that is used to measure the magnetic field size and can carries out auxiliary adjustment also is housed in the described built-in magnetising or demagnetising apparatus.
A kind ofly can fill the electromagnetic ultrasonic transducer of demagnetization, comprise built-in permanent magnet:
One is built in the intrinsic permanent magnet of electromagnetic ultrasonic transducer, is used for realizing that the electromagnetic acoustic testing process provides a stationary magnetic field;
One permanent magnet that can be seated in the electromagnetic ultrasonic transducer body is realized described permanent magnet is filled the external magnetising or demagnetising apparatus of demagnetization on every side.
The mensuration regulating device that is used to measure the magnetic field size and can carries out auxiliary adjustment also is housed in the described external magnetising or demagnetising apparatus.
A kind of using method that can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet, be to use in described electromagnetic ultrasonic transducer workpiece is carried out the electromagnetic acoustic detection, begin workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer, start magnetising or demagnetising apparatus work around the permanent magnet that has been demagnetized earlier, the permanent magnet that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus, stop to magnetize of magnetising or demagnetising apparatus after reaching the amount of magnetizing that needs at permanent magnet, form satisfactory stationary magnetic field and the electromagnetic acoustic of workpiece is detected guaranteeing; Finish at electromagnetic ultrasonic transducer and workpiece to be carried out after electromagnetic acoustic detects, restart magnetising or demagnetising apparatus work around the permanent magnet that has been magnetized, the permanent magnet that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus, after reaching satisfactory demagnetization amount, permanent magnet stops the demagnetization of magnetising or demagnetising apparatus, realize to eliminate or to weaken the intrinsic permanent magnet magnetic of electromagnetic ultrasonic transducer significantly and be easy to carry.
The using method of described electromagnetic ultrasonic transducer, also be included in workpiece is carried out in the process of electromagnetic acoustic detection, carry out the operation of following one or many as required: start magnetising or demagnetising apparatus work around the permanent magnet that has been magnetized earlier, the permanent magnet that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus, after reaching satisfactory demagnetization amount, permanent magnet stops the demagnetization of magnetising or demagnetising apparatus, realize to eliminate or to weaken the intrinsic permanent magnet magnetic of electromagnetic ultrasonic transducer significantly and be convenient on measured workpiece, adjust transposition; After adjusting transposition, restart magnetising or demagnetising apparatus work around the permanent magnet that has been demagnetized, the permanent magnet that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus, stop to magnetize of magnetising or demagnetising apparatus after reaching the amount of magnetizing that needs at permanent magnet, form satisfactory stationary magnetic field and proceed to guarantee that electromagnetic acoustic to workpiece detects.
A kind of electromagnetic ultrasonic transducer and the using method that can fill demagnetization to built-in permanent magnet of the present invention, belong to component invention, be in the electromagnetic ultrasonic transducer of stationary magnetic field to adopt permanent magnet promptly in prior art, use magnetising or demagnetising apparatus that permanent magnet built-in in the electromagnetic ultrasonic transducer is filled demagnetization, magnetising or demagnetising apparatus can be built in the electromagnetic ultrasonic transducer and be contained in around the permanent magnet, also can adopt external, in the time of need filling demagnetization, magnetising or demagnetising apparatus is put into around the permanent magnet of electromagnetic ultrasonic transducer, when not required, magnetising or demagnetising apparatus is taken from electromagnetic ultrasonic transducer, like this, can be made electromagnetic ultrasonic transducer continue to keep the characteristics of compact conformation, in order to guarantee the amount of magnetizing, on magnetising or demagnetising apparatus, can also be provided with the mensuration regulating device,, guarantee that permanent magnet magnetizes to meet the demands by measuring magnetic field.
The invention has the beneficial effects as follows, because adopted is to install magnetising or demagnetising apparatus additional in the electromagnetic ultrasonic transducer of stationary magnetic field in prior art to adopt permanent magnet, or increase by an external magnetising or demagnetising apparatus, when electromagnetic ultrasonic transducer does not carry out the electromagnetic acoustic detection, by magnetising or demagnetising apparatus the built-in permanent magnet of electromagnetic ultrasonic transducer is demagnetized, the magnetic of electromagnetic ultrasonic transducer is reduced, so that instrument is in the process of carrying, probe can be to the entrained on one's body ferromagnetism object of operator (as bank card, key etc.) produce absorption, also ferromagnetism object that can adsorption operations person periphery (bus door as by bus time the etc.), thereby it is very convenient in operator's carrying to instrument, and when electromagnetic ultrasonic transducer will carry out the electromagnetic acoustic detection, by magnetising or demagnetising apparatus the built-in permanent magnet of electromagnetic ultrasonic transducer is magnetized, guaranteed the result of use of electromagnetic ultrasonic transducer, particularly use ferromagnetic workpiece is being carried out in the testing process, by in the use or use the back magnetising or demagnetising apparatus that the built-in permanent magnet of electromagnetic ultrasonic transducer is demagnetized, eliminated electromagnetic ultrasonic transducer and be difficult to the drawback of taking off owing to the magnetic of permanent magnet from workpiece.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail; But of the present inventionly a kind ofly can be not limited to embodiment to electromagnetic ultrasonic transducer and the using method that built-in permanent magnet fills demagnetization.
Fig. 1 is the composition frame chart of electromagnetic ultrasonic transducer of the present invention (built-in magnetising or demagnetising apparatus);
Fig. 2 is the composition frame chart of electromagnetic ultrasonic transducer of the present invention (external magnetising or demagnetising apparatus).
Embodiment
Referring to shown in Figure 1, of the present inventionly a kind ofly can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet, be to adopt built-in magnetising or demagnetising apparatus, comprising:
One is built in the permanent magnet 1 in the electromagnetic ultrasonic transducer body 10, is used for realizing that the electromagnetic acoustic testing process provides a stationary magnetic field;
One is installed in the electromagnetic ultrasonic transducer body 10 and is located at built-in magnetising or demagnetising apparatus 2 around the permanent magnet 1, is used for realizing described permanent magnet is filled demagnetization.
Wherein, the mensuration regulating device that is used to measure the magnetic field size and can carries out auxiliary adjustment also is housed in the built-in magnetising or demagnetising apparatus 2.
Referring to shown in Figure 2, of the present inventionly a kind ofly can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet, be to adopt external magnetising or demagnetising apparatus, comprising:
One is built in the permanent magnet 1 in the electromagnetic ultrasonic transducer body 10, is used for realizing that the electromagnetic acoustic testing process provides a stationary magnetic field;
One permanent magnet 1 that can be seated in electromagnetic ultrasonic transducer body 10 is realized described permanent magnet is filled the external magnetising or demagnetising apparatus 3 of demagnetization on every side.
Wherein, the mensuration regulating device that is used to measure the magnetic field size and can carries out auxiliary adjustment also is housed in the external magnetising or demagnetising apparatus 3.
Below in conjunction with accompanying drawing a kind of using method that can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet of the present invention is described, this method comprise be used in 10 pairs of nonferromagnetic workpiece of described electromagnetic ultrasonic transducer (as the aluminium workpiece) carry out electromagnetic acoustic detect and be used in as described in 10 pairs of ferromagnetic workpieces of electromagnetic ultrasonic transducer (ironworker's part) carry out electromagnetic acoustic and detect.
Carry out electromagnetic acoustic when detecting being used in 10 pairs of nonferromagnetic workpiece of described electromagnetic ultrasonic transducer (as the aluminium workpiece), the present invention mainly solves portable problem, therefore, when electromagnetic ultrasonic transducer 10 is not worked, utilize magnetising or demagnetising apparatus that electromagnetic ultrasonic transducer 10 built-in permanent magnets 1 are demagnetized, magnetising or demagnetising apparatus can be built-in or external.When adopting built-in magnetising or demagnetising apparatus 2, begin the nonferromagnetic workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer 10, start magnetising or demagnetising apparatus 2 work earlier, the permanent magnet 1 that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus 2, stop to magnetize of magnetising or demagnetising apparatus after reaching the amount of magnetizing that needs at permanent magnet 1, form satisfactory stationary magnetic field and the electromagnetic acoustic of nonferromagnetic workpiece is detected guaranteeing; Finish magnetize after, electromagnetic ultrasonic transducer 10 just can carry out electromagnetic acoustic to the nonferromagnetic workpiece and detect; Finish at electromagnetic ultrasonic transducer 10 and the nonferromagnetic workpiece to be carried out after electromagnetic acoustic detects, restart magnetising or demagnetising apparatus 2 work, the permanent magnet that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus 2, after reaching satisfactory demagnetization amount, permanent magnet 1 stops the demagnetization of magnetising or demagnetising apparatus 2, realize to eliminate or to weaken the intrinsic permanent magnet magnetic of electromagnetic ultrasonic transducer significantly and be easy to carry.When adopting the magnetising or demagnetising apparatus 3 of external, begin the nonferromagnetic workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer 10, magnetising or demagnetising apparatus 3 is placed on around the permanent magnet 1 of electromagnetic ultrasonic transducer earlier, start magnetising or demagnetising apparatus 3 work around the permanent magnet 1 that has been demagnetized, the permanent magnet 1 that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus 3, stop to magnetize of magnetising or demagnetising apparatus 3 after reaching the amount of magnetizing that needs at permanent magnet 1, form satisfactory stationary magnetic field and the electromagnetic acoustic of nonferromagnetic workpiece is detected guaranteeing; Finish magnetize after, magnetising or demagnetising apparatus 3 is taken away, electromagnetic ultrasonic transducer 10 just can carry out electromagnetic acoustic to the nonferromagnetic workpiece and detect; Finish at electromagnetic ultrasonic transducer 10 and the nonferromagnetic workpiece to be carried out after electromagnetic acoustic detects, magnetising or demagnetising apparatus 3 is placed on around the permanent magnet 1 again, start magnetising or demagnetising apparatus 3 work around the permanent magnet that has been magnetized, the permanent magnet 1 that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus 3, after reaching satisfactory demagnetization amount, permanent magnet 1 stops the demagnetization of magnetising or demagnetising apparatus 3, realize to eliminate or to weaken intrinsic permanent magnet 1 magnetic of electromagnetic ultrasonic transducer significantly and be easy to carry.
Carry out electromagnetic acoustic when detecting being used in 10 pairs of ferromagnetic workpieces of described electromagnetic ultrasonic transducer (as ironworker's part), the present invention mainly solves to be convenient to take off and portable problem from ironworker's part, therefore, when electromagnetic ultrasonic transducer 10 is not worked, utilize magnetising or demagnetising apparatus that electromagnetic ultrasonic transducer 10 built-in permanent magnets 1 are demagnetized, magnetising or demagnetising apparatus can be built-in or external.When adopting built-in magnetising or demagnetising apparatus 2, begin ferromagnetic workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer 10, start magnetising or demagnetising apparatus 2 work earlier, the permanent magnet 1 that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus 2, stop to magnetize of magnetising or demagnetising apparatus 2 after reaching the amount of magnetizing that needs at permanent magnet 1, form satisfactory stationary magnetic field and the electromagnetic acoustic of ferromagnetic workpiece is detected guaranteeing; Finish magnetize after, electromagnetic ultrasonic transducer 10 just can carry out electromagnetic acoustic to ferromagnetic workpiece and detect; Finish at electromagnetic ultrasonic transducer 10 and ferromagnetic workpiece to be carried out after electromagnetic acoustic detects, restart magnetising or demagnetising apparatus 2 work, the permanent magnet 1 that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus 2, after reaching satisfactory demagnetization amount, permanent magnet 1 stops the demagnetization of magnetising or demagnetising apparatus 2, realize to eliminate or to weaken permanent magnet 1 magnetic in the electromagnetic ultrasonic transducer body 10 significantly and be convenient to take off and carry from ferromagnetic workpiece.When adopting the magnetising or demagnetising apparatus 3 of external, begin ferromagnetic workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer 10, magnetising or demagnetising apparatus 3 is placed on around the permanent magnet 1 of electromagnetic ultrasonic transducer body 10 earlier, start magnetising or demagnetising apparatus 3 work around the permanent magnet 1 that has been demagnetized, the permanent magnet 1 that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus 3, stop to magnetize of magnetising or demagnetising apparatus 3 after reaching the amount of magnetizing that needs at permanent magnet 1, form satisfactory stationary magnetic field and the electromagnetic acoustic of ferromagnetic workpiece is detected guaranteeing; Finish magnetize after, magnetising or demagnetising apparatus 3 is taken away, electromagnetic ultrasonic transducer 10 just can carry out electromagnetic acoustic to ferromagnetic workpiece and detect; Finish at electromagnetic ultrasonic transducer 10 and ferromagnetic workpiece to be carried out after electromagnetic acoustic detects, work around again magnetising or demagnetising apparatus 3 being placed on the permanent magnet 1 that has been magnetized, the permanent magnet 1 that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus 3, after reaching satisfactory demagnetization amount, permanent magnet 1 stops the demagnetization of magnetising or demagnetising apparatus 3, realize to eliminate or to weaken permanent magnet 1 magnetic in the electromagnetic ultrasonic transducer body 10 significantly and be convenient to take off and carry from ferromagnetic workpiece.
Carry out electromagnetic acoustic when detecting being used in 10 pairs of ferromagnetic workpieces of described electromagnetic ultrasonic transducer (as ironworker's part), also be included in ferromagnetic workpiece is carried out in the process of electromagnetic acoustic detection, carrying out the demagnetization of filling of following one or many as required operates, this be since electromagnetic ultrasonic transducer 10 in when transposition, might can't take off with the suction mutually of ferromagnetic workpiece, at this moment, to start magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3 (being placed on around the electromagnetic ultrasonic transducer 10) work around the permanent magnet 1 that has been magnetized earlier, the permanent magnet 1 that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3, after reaching satisfactory demagnetization amount, permanent magnet 1 stops the demagnetization of magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3, realize to eliminate or to weaken permanent magnet 1 magnetic in the electromagnetic ultrasonic transducer body 10 significantly and be convenient on tested ferromagnetic workpiece, adjust transposition; After adjusting transposition, restart the work around the permanent magnet 1 that has been demagnetized of magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3, the permanent magnet 1 that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3, stop to magnetize of magnetising or demagnetising apparatus 2 or magnetising or demagnetising apparatus 3 after reaching the amount of magnetizing that needs at permanent magnet 1, forming satisfactory stationary magnetic field proceeds the electromagnetic acoustic detection of ferromagnetic workpiece with assurance, magnetize finish after, magnetising or demagnetising apparatus 3 will be taken away.
The foregoing description only is used for further specifying a kind of electromagnetic ultrasonic transducer and the using method that can fill demagnetization to built-in permanent magnet of the present invention; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (3)
1. one kind can be filled the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet, comprising:
One is built in the intrinsic permanent magnet of electromagnetic ultrasonic transducer, is used for realizing that the electromagnetic acoustic testing process provides a stationary magnetic field;
It is characterized in that: also comprise:
One is installed in the electromagnetic ultrasonic transducer body and is located at built-in magnetising or demagnetising apparatus around the permanent magnet, is used for realizing described permanent magnet is filled demagnetization;
The mensuration regulating device that is used to measure the magnetic field size and can carries out auxiliary adjustment also is housed in the described built-in magnetising or demagnetising apparatus.
2. the using method that can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet as claimed in claim 1, it is characterized in that: be to use described electromagnetic ultrasonic transducer that workpiece is carried out electromagnetic acoustic and detect, begin workpiece carried out before electromagnetic acoustic detects at electromagnetic ultrasonic transducer, start magnetising or demagnetising apparatus work around the permanent magnet that has been demagnetized earlier, the permanent magnet that has demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus, stop to magnetize of magnetising or demagnetising apparatus after reaching the amount of magnetizing that needs at permanent magnet, form satisfactory stationary magnetic field and the electromagnetic acoustic of workpiece is detected guaranteeing; Finish at electromagnetic ultrasonic transducer and workpiece to be carried out after electromagnetic acoustic detects, restart magnetising or demagnetising apparatus work around the permanent magnet that has been magnetized, the permanent magnet that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus, after reaching satisfactory demagnetization amount, permanent magnet stops the demagnetization of magnetising or demagnetising apparatus, realize to eliminate or to weaken the intrinsic permanent magnet magnetic of electromagnetic ultrasonic transducer significantly and be easy to carry.
3. a kind of using method that can fill the electromagnetic ultrasonic transducer of demagnetization to built-in permanent magnet according to claim 2, it is characterized in that: the using method of described electromagnetic ultrasonic transducer, also be included in workpiece is carried out in the process of electromagnetic acoustic detection, carry out the operation of following one or many as required: start magnetising or demagnetising apparatus work around the permanent magnet that has been magnetized earlier, the permanent magnet that has been magnetized is demagnetized again, and according to measuring the mensuration of regulating device to demagnetization, control by the input current of regulating magnetising or demagnetising apparatus, after reaching satisfactory demagnetization amount, permanent magnet stops the demagnetization of magnetising or demagnetising apparatus, realize to eliminate or to weaken the intrinsic permanent magnet magnetic of electromagnetic ultrasonic transducer significantly and be convenient on measured workpiece, adjust transposition; After adjusting transposition, restart magnetising or demagnetising apparatus work around the permanent magnet that has been demagnetized, the permanent magnet that has been demagnetized is magnetized again, and according to measuring the mensuration of regulating device to the size that magnetizes, control by the input current of regulating magnetising or demagnetising apparatus, stop to magnetize of magnetising or demagnetising apparatus after reaching the amount of magnetizing that needs at permanent magnet, form satisfactory stationary magnetic field and proceed to guarantee that electromagnetic acoustic to workpiece detects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100084844A CN101231269B (en) | 2007-01-23 | 2007-01-23 | Electromagnetic ultrasonic transducer capable of charging or discharging magnetism for build-in permanent magnet as well as use method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100084844A CN101231269B (en) | 2007-01-23 | 2007-01-23 | Electromagnetic ultrasonic transducer capable of charging or discharging magnetism for build-in permanent magnet as well as use method |
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| Publication Number | Publication Date |
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| CN101231269A CN101231269A (en) | 2008-07-30 |
| CN101231269B true CN101231269B (en) | 2010-09-29 |
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| CN2007100084844A Expired - Fee Related CN101231269B (en) | 2007-01-23 | 2007-01-23 | Electromagnetic ultrasonic transducer capable of charging or discharging magnetism for build-in permanent magnet as well as use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105403626B (en) * | 2015-12-14 | 2018-04-17 | 河北工业大学 | A kind of electromagnet ultrasonic changer with novel permanent magnetic device |
| CN105372335B (en) * | 2015-12-14 | 2017-12-01 | 河北工业大学 | A kind of electromagnetic ultrasonic probe |
| CN109616278B (en) * | 2019-01-28 | 2021-05-11 | 玉林师范学院 | Intelligent nano powder demagnetizer and demagnetization method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081559U (en) * | 1991-02-08 | 1991-07-24 | 中国科学院物理研究所 | High-capacity magnetizing and demagnetization machine |
| CN2222353Y (en) * | 1994-10-10 | 1996-03-13 | 华中理工大学 | Electromagnetic ultrosonic energy exchanger |
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2007
- 2007-01-23 CN CN2007100084844A patent/CN101231269B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081559U (en) * | 1991-02-08 | 1991-07-24 | 中国科学院物理研究所 | High-capacity magnetizing and demagnetization machine |
| CN2222353Y (en) * | 1994-10-10 | 1996-03-13 | 华中理工大学 | Electromagnetic ultrosonic energy exchanger |
Non-Patent Citations (4)
| Title |
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| 陈永煌.电容充、放电式自动充、退磁机.安徽机电学院学报15 3.2000,15(3),65-68. |
| 陈永煌.电容充、放电式自动充、退磁机.安徽机电学院学报15 3.2000,15(3),65-68. * |
| 黄磊.电磁声换能器的设计与应用.无损探伤30 1.2006,30(1),27-28. |
| 黄磊.电磁声换能器的设计与应用.无损探伤30 1.2006,30(1),27-28. * |
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| CN101231269A (en) | 2008-07-30 |
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