CN104880163A - Electromagnetic ultrasonic sensor and pipeline wall thickness detection system - Google Patents
Electromagnetic ultrasonic sensor and pipeline wall thickness detection system Download PDFInfo
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- CN104880163A CN104880163A CN201510297309.6A CN201510297309A CN104880163A CN 104880163 A CN104880163 A CN 104880163A CN 201510297309 A CN201510297309 A CN 201510297309A CN 104880163 A CN104880163 A CN 104880163A
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- electromagnetic ultrasonic
- ultrasonic transducer
- wall thickness
- under test
- permanent magnets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
Abstract
The invention relates to the technical field of ultrasonic detection, and especially relates to an electromagnetic ultrasonic sensor and a pipeline wall thickness detection system. The electromagnetic ultrasonic sensor comprises a shell, a coil, a magnetism gathering element, and two permanent magnets. The coil, the magnetism gathering element and the two permanent magnets are arranged inside the shell. The two permanent magnets are oppositely arranged at intervals and parallel to each other, and the ends of the two permanent magnets at the same side are opposite in polarity. The magnetism gathering element and the coil are oppositely arranged at intervals. The magnetism gathering element is disposed at one end of the two permanent magnets, the coil is disposed at the other end of the two permanent magnets, and the coil is arranged between the two permanent magnets. The pipeline wall thickness detection system comprises at least one electromagnetic ultrasonic sensor, a signal generator, and a signal processor, wherein the electromagnetic ultrasonic sensor is electrically connected with the signal generator and the signal processor. The detection accuracy is greatly improved, and a good detection effect is achieved.
Description
Technical field
The present invention relates to ultrasonic detection technology field, especially relate to a kind of electromagnetic ultrasonic transducer and pipe wall thickness testing system.
Background technology
In ultrasonic thickness test field, because electromagnetic ultrasonic wave is compared with piezoelectric ultrasonic, electromagnetic ultrasonic wave has does not need couplant, non-contact detecting, can adapt to the advantages such as high temp objects detection and just constantly be widely used in every profession and trade, and wherein couplant is generally water.But because the velocity of propagation of electromagnetic acoustic shear wave in testee is lower than electromagnetic acoustic compressional wave, therefore generally use electromagnetic acoustic shear wave to carry out thickness measuring; But, under the high temperature conditions, that is under the condition of temperature more than 800 DEG C, the amplitude fading of electromagnetic acoustic shear wave and electromagnetic acoustic compressional wave is all very serious, and the attenuation degree of electromagnetic acoustic shear wave is greater than electromagnetic acoustic compressional wave, and the electromagnetic ultrasonic transducer of routine because of its signal to noise ratio (S/N ratio) low, for detecting high-temperature pipe wall thickness, its effect is often poor.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic ultrasonic transducer and pipe wall thickness testing system, low because of its signal to noise ratio (S/N ratio) to solve the electromagnetic ultrasonic transducer existed in prior art, cause the technical matters to high-temperature pipe wall thickness Detection results difference.
A kind of electromagnetic ultrasonic transducer provided by the invention, comprises shell, coil, poly-magnetic cell and two block permanent magnets; Described coil, described poly-magnetic cell and two blocks of described permanent magnets are arranged on the inside of described shell; Two block permanent magnet relative spacings are arranged and are parallel to each other, and the polarity of the end of two block permanent magnet homonymies is contrary; Described poly-magnetic cell and described coil relative spacing are arranged, described poly-magnetic cell is positioned at one end of two block permanent magnets, and described coil is positioned at the other end of two block permanent magnets, and described coil is arranged between two block permanent magnets.
Further, described poly-magnetic cell is iron core, and described iron core is the shape of truncated rectangular pyramids.
Present invention also offers a kind of pipe wall thickness testing system, comprise the electromagnetic ultrasonic transducer described at least one, signal generator and signal processor, described electromagnetic ultrasonic transducer respectively with described signal generator, described signal transacting mechatronics, described electromagnetic ultrasonic transducer along the radial distribution of the outside surface of pipe under test, with the thickness of testing pipes wall.
Further, also comprise electromagnetic acoustic and measure ring and controller; Described electromagnetic ultrasonic transducer is arranged on described electromagnetic acoustic and measures on ring.
Further, described electromagnetic acoustic is measured ring and is comprised chuck assembly and chuck base, and described chuck assembly is fixed on described chuck base.
Further, described chuck assembly comprises chuck body, clamp driving mechanism and at least one movable clamp; Described electromagnetic ultrasonic transducer is fixed on described movable clamp; Described movable clamp is arranged on described chuck body, and described movable clamp can along the radial motion of described chuck body; Described clamp driving mechanism, for driving described movable clamp, makes it along the radial motion of described chuck body.
Further, described clamp driving mechanism comprises drive bevel gear, driven wheel of differential and the first drive motor; Described first drive motor is electrically connected with described controller; An end face of described driven wheel of differential is provided with conical insert, and another end face is provided with helicla flute; Described movable clamp is provided with screw thread with the surface of contact of described driven wheel of differential, and described screw thread is meshed with described helicla flute.
Further, described movable clamp is provided with guide position limiter, for suppressing beating of pipeline; Described guide position limiter is fixedly connected with described electromagnetic ultrasonic transducer, and described electromagnetic ultrasonic transducer is between described movable clamp and described guide position limiter;
Described guide position limiter comprises the first orienting lug, the first angle sheave and the first cooling fluid pipe; Described first orienting lug is fixed on described electromagnetic ultrasonic transducer; Described first angle sheave is arranged on described first orienting lug, rolls for the outside surface along pipe under test;
Distance between the spigot surface of described first orienting lug and the outside surface of described pipe under test increases gradually along the direct of travel of reverse described pipe under test;
Described first cooling fluid pipe is used for passing into water or pressure gas cools the first angle sheave.
Further, sizing mill and at least one centering stop means is also comprised; Described centering stop means, for suppressing beating of pipeline; Described centering stop means is measured between ring at described sizing mill and described electromagnetic acoustic;
Described centering stop means comprises spacing base and is fixed on the frame on described spacing base; Described frame is provided with guiding conveying roller mechanism and limiting roll mechanism, described guiding conveying roller mechanism is positioned at the top of described limiting roll mechanism;
Described guiding conveying roller mechanism comprises conveying roller, transmission shaft and the second drive motor, and described conveying roller is connected with described transmission shaft, and described transmission shaft is connected with described second drive motor;
Described limiting roll mechanism comprises limiting roll, the 3rd drive motor and guidance set, and described 3rd drive motor can move up and down for driving described limiting roll; Described guidance set is arranged on described limiting roll;
Described guidance set comprises the second orienting lug and the second angle sheave, and described second angle sheave is arranged on described second orienting lug, rolls for the outside surface along described pipe under test; Distance between the spigot surface of described second orienting lug and the outside surface of described pipe under test increases gradually along the direct of travel of reverse described pipe under test.
Further, described centering stop means is provided with the 3rd drive motor for driving described conveying roller to move up and down.
Compared with prior art, beneficial effect of the present invention is:
Electromagnetic ultrasonic transducer provided by the invention, because coil is positioned at the other end of two block permanent magnets, and coil is arranged between two block permanent magnets, this enhance the penetration capacity of electromagnetic acoustic compressional wave, improve the signal to noise ratio (S/N ratio) of electromagnetic ultrasonic transducer, when for detecting high-temperature pipe wall thickness, substantially increase the precision of detection, there is good Detection results.
The pipe wall thickness testing system that the present invention also provides, comprise the electromagnetic ultrasonic transducer provided by the invention of at least one, by its radial distribution along the outside surface of high-temperature pipe to be measured during work, be used for the thickness of testing pipes wall, the precision detected is high, has good Detection results.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the electromagnetic ultrasonic transducer that Fig. 1 provides for the embodiment of the present invention one;
The operating diagram of the pipe wall thickness testing system that Fig. 2 provides for the embodiment of the present invention two;
Fig. 3 is the axonometric drawing that in the embodiment of the present invention two, electromagnetic acoustic measures ring;
Fig. 4 is the front view that in the embodiment of the present invention two, electromagnetic acoustic measures ring;
Fig. 5 is the cut-open view along A-A line in Fig. 4;
Fig. 6 is the axonometric drawing of centering stop means in the embodiment of the present invention two;
Fig. 7 is the front view of centering stop means in the embodiment of the present invention two;
Fig. 8 is the cut-open view along B-B line in Fig. 7.
Reference numeral:
1-roller-way; 2-pipe under test; 5-electromagnetic acoustic measures ring;
6-sizing mill; 7-optoelectronic switch; 8-centering stop means;
51-chuck base; 53-electromagnetic ultrasonic transducer; 55-chuck assembly;
56-gas blow pipe; The spacing base of 81-; 82-frame;
83-conveying roller; 84-limiting roll; 85-four-wheel drive motor;
86-the 3rd drive motor; 531-first orienting lug; 532-first cooling fluid pipe;
533-first angle sheave; 534-shell; 535-gathers magnetic cell;
536-permanent magnet; 538-coil; 551-chuck body;
The movable clamp of 552-; 553-clamp driving mechanism; 553a-driven wheel of differential;
553b-drive bevel gear; 553c-first drive motor; 554-conical insert;
555-helicla flute; 556-screw thread; 831-transmission shaft;
832-second drive motor; 841-second orienting lug; 842-second angle sheave;
843-second cooling fluid pipe.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Embodiment one
The structural representation of the electromagnetic ultrasonic transducer that Fig. 1 provides for the embodiment of the present invention one, shown in Figure 1, the embodiment of the present invention one provides a kind of electromagnetic ultrasonic transducer, comprises shell 534, coil 538, poly-magnetic cell 535 and two block permanent magnets 536; Coil 538, poly-magnetic cell 535 and two block permanent magnets 536 are arranged on the inside of shell 534; Two block permanent magnet 536 relative spacings are arranged and are parallel to each other, and the polarity of the end of two block permanent magnet 536 homonymies is contrary; Poly-magnetic cell 535 and coil 538 relative spacing are arranged, poly-magnetic cell 535 is positioned at one end of two block permanent magnets 536, and coil 538 is positioned at the other end of two block permanent magnets 536, and coil 538 is arranged between two block permanent magnets 536.Electromagnetic ultrasonic transducer provided by the invention, because coil 538 is positioned at the other end of two block permanent magnets 536, and coil 538 is arranged between two block permanent magnets 536, this enhance the penetration capacity of electromagnetic acoustic compressional wave, improve the signal to noise ratio (S/N ratio) of electromagnetic ultrasonic transducer, when for detecting high-temperature pipe wall thickness, substantially increase the precision of detection, there is good Detection results.
In the embodiment of the present invention one, coil 538 is single flat surface helix shape coil 538; Poly-magnetic cell 535 is iron core, and iron core is the shape of truncated rectangular pyramids.
Embodiment two
The operating diagram of the pipe wall thickness testing system that Fig. 2 provides for the embodiment of the present invention two, Fig. 3 is the axonometric drawing that in the embodiment of the present invention two, electromagnetic acoustic measures ring, Fig. 4 is the front view that in the embodiment of the present invention two, electromagnetic acoustic measures ring, Fig. 5 is the cut-open view along A-A line in Fig. 4, Fig. 6 is the axonometric drawing of centering stop means in the embodiment of the present invention two, Fig. 7 is the front view of centering stop means in the embodiment of the present invention two, Fig. 8 is the cut-open view along B-B line in Fig. 7, for convenience of explanation, Fig. 5, pipe under test has been shown in Fig. 7 and Fig. 8, see shown in Fig. 2 to Fig. 8, the embodiment of the present invention two provides a kind of pipe wall thickness testing system, the electromagnetic ultrasonic transducer 53 provided at least one embodiment one is provided, signal generator (not shown) and signal processor (not shown), electromagnetic ultrasonic transducer 53 respectively with signal generator, signal transacting mechatronics, electromagnetic ultrasonic transducer 53 along the radial distribution of the outside surface of pipe under test 2, with the thickness of testing pipes wall, during work, signal generator provides pumping signal to electromagnetic ultrasonic transducer 53, the signal of the thickness of the duct wall that signal processor acquisition process electromagnetic ultrasonic transducer 53 induces.It should be noted that, in the present embodiment two, the temperature of pipe under test 2 is more than 800 DEG C.Originally execute the pipe wall thickness testing system that example two provides, the precision of detection is high, and has good Detection results.
In the present embodiment two, pipe wall thickness testing system also comprises electromagnetic acoustic and measures ring 5 and controller (not shown); Electromagnetic ultrasonic transducer 53 is arranged on electromagnetic acoustic and measures on ring 5.
Shown in Fig. 3 and Fig. 4, in the present embodiment two, electromagnetic acoustic is measured ring 5 and is comprised chuck assembly 55 and chuck base 51, and chuck assembly 55 is fixed on chuck base 51.Chuck assembly 55 comprises chuck body 551, clamp driving mechanism 553 and at least one movable clamp 552; Electromagnetic ultrasonic transducer 53 is fixed on movable clamp 552; Movable clamp 552 is arranged on chuck body 551, and movable clamp 552 can along the radial motion of chuck body 551; Clamp driving mechanism 553, for driving movable clamp 552, makes it along the radial motion of chuck body 551.Chuck body 551 is provided with gas blow pipe 56, for purging the detection faces of electromagnetic ultrasonic transducer 53, can ensure the detection faces of electromagnetic ultrasonic transducer 53 like this, reduces measuring error.In the present embodiment two, the detection faces of electromagnetic ultrasonic transducer 53 i.e. electromagnetic ultrasonic transducer 53 one side relative with the outside surface of pipe under test 2.
In the present embodiment two, the quantity of electromagnetic ultrasonic transducer 53 is 6, and the quantity of movable clamp 552 is 6, and 6 movable clamps 552 are evenly arranged on chuck body 551, when detecting pipe under test 2,6 electromagnetic ultrasonic transducers 53 are uniformly distributed along the radial direction of pipe under test 2.It should be noted that, in the present embodiment two, the quantity of electromagnetic ultrasonic transducer 53 and movable clamp 552 also freely can be chosen according to actual conditions, such as 3,4 or 8, but ensure that the quantity of electromagnetic ultrasonic transducer 53 is less than or equal to the quantity of movable clamp 552, for other situation, the present embodiment two no longer specifically repeats one by one.
Shown in Fig. 3, Fig. 4 and Fig. 5, in the present embodiment two, clamp driving mechanism 553 comprises drive bevel gear 553b, driven wheel of differential 553a and the first drive motor 553c; First drive motor 553c is electrically connected with controller; An end face of driven wheel of differential 553a is provided with conical insert 554, and another end face is provided with helicla flute 555; Movable clamp 552 is provided with screw thread 556 with the surface of contact of driven wheel of differential 553a, and screw thread 556 is meshed with helicla flute 555.
In the present embodiment two, movable clamp 552 is provided with guide position limiter, for suppressing beating of pipeline; Guide position limiter is fixedly connected with electromagnetic ultrasonic transducer 53, and electromagnetic ultrasonic transducer 53 is between movable clamp 552 and guide position limiter.Beating of pipe under test 2 can be prevented excessive by guide position limiter, and the situation damaging electromagnetic ultrasonic transducer 53 occur.
Shown in Figure 5, in the present embodiment two, guide position limiter comprises the first orienting lug 531, first angle sheave 533 and the first cooling fluid pipe 532; First orienting lug 531 is fixed on electromagnetic ultrasonic transducer 53; First angle sheave 533 is arranged on the first orienting lug 531, rolls for the outside surface along pipe under test 2; Distance between the spigot surface of the first orienting lug 531 and the outside surface of pipe under test 2 increases gradually along the direct of travel of reverse pipe under test 2, and pipe under test 2 can be made like this to move to the direction at electromagnetic ultrasonic transducer 53 place smoothly.First cooling fluid pipe 532, for passing into water or pressure gas cools the first angle sheave 533, can extend the serviceable life of the first angle sheave 533 like this.It should be noted that, the spigot surface one side that namely the first orienting lug 531 is relative with the outside surface of pipe under test 2 of the first orienting lug 531.
In the present embodiment two, distance between the subtend face of movable clamp 552 and the outside surface of pipe under test 2 is more than or equal to the distance between the detection faces of electromagnetic ultrasonic transducer 53 and the outside surface of pipe under test 2, wherein subtend face is the one side that movable clamp 552 is relative with the outside surface of pipe under test 2, and detection faces is the one side that electromagnetic ultrasonic transducer 53 is relative with the outside surface of pipe under test 2.
In the present embodiment two, the distance between the spigot surface of guide position limiter and the outside surface of pipe under test 2 is less than the distance between the detection faces of electromagnetic ultrasonic transducer 53 and the outside surface of pipe under test 2.
Shown in Figure 2, in the present embodiment two, pipe wall thickness testing system also comprises sizing mill 6 and at least one centering stop means 8; Centering stop means 8, for suppressing beating of pipeline, further like this decreasing beating of pipeline, can better protect electromagnetic ultrasonic transducer 53.Centering stop means 8 is measured between ring 5 at sizing mill 6 and electromagnetic acoustic.During work, pipe under test 2 measures ring 5 through sizing mill 6, centering stop means 8 and electromagnetic acoustic successively; When pipe under test 2 transmits on roller-way 1, because pipe under test 2 is just after sizing mill 6, pipe under test 2 is beated less, electromagnetic acoustic being measured ring 5 is arranged near the endpiece of sizing mill 6, can overproof, the problem such as degree of eccentricity is excessive of the wall thickness of Timeliness coverage pipe under test, thus can take measures in time to correct.If detected the pipe under test of being down to normal temperature, when after the problems such as discovery wall thickness is overproof, degree of eccentricity is excessive, now correct the control gear of the wall thickness of pipe under test again, huge loss can be caused like this, because when pipe under test be down to normal temperature during this period of time in, rolled out other much more very pipe under test.
Shown in Fig. 6, Fig. 7 and Fig. 8, in the present embodiment two, the frame 82 that centering stop means 8 comprises spacing base 81 and is fixed on spacing base 81; Frame 82 is provided with guiding conveying roller mechanism and limiting roll mechanism, guiding conveying roller mechanism is positioned at the top of limiting roll mechanism; Guiding conveying roller mechanism comprises conveying roller 83, transmission shaft 831 and the second drive motor 832, and conveying roller 83 is connected with transmission shaft 831, and transmission shaft 831 is connected with the second drive motor 832; Limiting roll mechanism comprises limiting roll 84, the 3rd drive motor 86 and guidance set, and the 3rd drive motor 86 can move up and down for driving limiting roll 84; Guidance set is arranged on limiting roll 84; Guidance set comprises the second orienting lug 841 and the second angle sheave 842, second angle sheave 842 is arranged on the second orienting lug 841, rolls for the outside surface along pipe under test 2; Distance between the spigot surface of the second orienting lug 841 and the outside surface of pipe under test 2 increases gradually along the direct of travel of reverse pipe under test 2, and pipe under test 2 can be made like this to move to the direction at electromagnetic ultrasonic transducer 53 place smoothly.Guidance set also comprises the second cooling fluid pipe 843, for passing into water or pressure gas cools the second angle sheave.
Shown in Figure 6, in the present embodiment two, centering stop means 8 is provided with the four-wheel drive motor 85 for driving conveying roller to move up and down, and can ensure that the central axis of the pipe under test 2 of various outer diameter is all in identical position like this.
Shown in Figure 2, in the present embodiment two, the quantity of centering stop means 8 is one; Sizing mill 6 being provided with optoelectronic switch 7, for when the tube head of pipe under test 2 being detected, making electromagnetic ultrasonic transducer 53 enter working position from wait position, when the pipe tail of pipe under test 2 being detected, electromagnetic ultrasonic transducer 53 being returned to from working position and waits for position.Photoelectricity is opened and is electrically connected with controller.The principle of work of optoelectronic switch is: when the arrival of tube head of pipe under test being detected, and after controller postpones setting-up time, the first drive motor 553c drives electromagnetic ultrasonic transducer 53 to enter working position from wait position; When detecting that the pipe tail of pipe under test arrives, the first drive motor 553c drives electromagnetic ultrasonic transducer 53 to return from working position and waits for position, waits for the measurement of next root pipe under test.It should be noted that, in the present embodiment two, the quantity of centering stop means can also be two, and two centering stop means are disposed adjacent along the direct of travel of pipe under test; When the quantity of centering stop means is two, the centering stop means adjacent with sizing mill is provided with optoelectronic switch, for when the tube head of pipe under test being detected, electromagnetic ultrasonic transducer is made to enter working position from wait position, when the pipe tail of pipe under test being detected, electromagnetic ultrasonic transducer being returned to from working position and waits for position.
The pipe wall thickness testing system employing electromagnetic ultrasonic transducer that the present embodiment provides sends electromagnetic ultrasonic wave and carries out thickness measuring to pipeline wall thickness, and it is high that it has accuracy of detection, effective feature.Compared with utilizing the thickness measurement with ray of radioelement radiation, better can protect personal safety, and working service is convenient; Launching compared with short pulse laser beam thickness measuring with utilizing laser aid, the laser launched can be avoided to have injury to human eye and skin.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. an electromagnetic ultrasonic transducer, is characterized in that, comprises shell, coil, poly-magnetic cell and two block permanent magnets; Described coil, described poly-magnetic cell and two blocks of described permanent magnets are arranged on the inside of described shell; Two block permanent magnet relative spacings are arranged and are parallel to each other, and the polarity of the end of two block permanent magnet homonymies is contrary; Described poly-magnetic cell and described coil relative spacing are arranged, described poly-magnetic cell is positioned at one end of two block permanent magnets, and described coil is positioned at the other end of two block permanent magnets, and described coil is arranged between two block permanent magnets.
2. electromagnetic ultrasonic transducer according to claim 1, is characterized in that, described poly-magnetic cell is iron core, and described iron core is the shape of truncated rectangular pyramids.
3. a pipe wall thickness testing system, it is characterized in that, comprise at least one electromagnetic ultrasonic transducer, signal generator and signal processor as described in claim 1 or 2, described electromagnetic ultrasonic transducer respectively with described signal generator, described signal transacting mechatronics, described electromagnetic ultrasonic transducer along the radial distribution of the outside surface of pipe under test, with the thickness of testing pipes wall.
4. pipe wall thickness testing system according to claim 3, is characterized in that, also comprises electromagnetic acoustic and measures ring and controller; Described electromagnetic ultrasonic transducer is arranged on described electromagnetic acoustic and measures on ring.
5. pipe wall thickness testing system according to claim 4, is characterized in that, described electromagnetic acoustic is measured ring and comprised chuck assembly and chuck base, and described chuck assembly is fixed on described chuck base.
6. pipe wall thickness testing system according to claim 5, it is characterized in that, described chuck assembly comprises chuck body, clamp driving mechanism and at least one movable clamp; Described electromagnetic ultrasonic transducer is fixed on described movable clamp; Described movable clamp is arranged on described chuck body, and described movable clamp can along the radial motion of described chuck body; Described clamp driving mechanism, for driving described movable clamp, makes it along the radial motion of described chuck body.
7. pipe wall thickness testing system according to claim 6, it is characterized in that, described clamp driving mechanism comprises drive bevel gear, driven wheel of differential and the first drive motor; Described first drive motor is electrically connected with described controller; An end face of described driven wheel of differential is provided with conical insert, and another end face is provided with helicla flute; Described movable clamp is provided with screw thread with the surface of contact of described driven wheel of differential, and described screw thread is meshed with described helicla flute.
8. according to the system of pipe wall thickness testing described in claim 6 or 7, it is characterized in that, described movable clamp is provided with guide position limiter, for suppressing beating of pipeline; Described guide position limiter is fixedly connected with described electromagnetic ultrasonic transducer, and described electromagnetic ultrasonic transducer is between described movable clamp and described guide position limiter;
Described guide position limiter comprises the first orienting lug, the first angle sheave and the first cooling fluid pipe; Described first orienting lug is fixed on described electromagnetic ultrasonic transducer; Described first angle sheave is arranged on described first orienting lug, rolls for the outside surface along pipe under test;
Distance between the spigot surface of described first orienting lug and the outside surface of described pipe under test increases gradually along the direct of travel of reverse described pipe under test;
Described first cooling fluid pipe is used for passing into water or pressure gas cools the first angle sheave.
9. pipe wall thickness testing system according to any one of claim 4 to 7, is characterized in that, also comprises sizing mill and at least one centering stop means; Described centering stop means, for suppressing beating of pipeline; Described centering stop means is measured between ring at described sizing mill and described electromagnetic acoustic;
Described centering stop means comprises spacing base and is fixed on the frame on described spacing base; Described frame is provided with guiding conveying roller mechanism and limiting roll mechanism, described guiding conveying roller mechanism is positioned at the top of described limiting roll mechanism;
Described guiding conveying roller mechanism comprises conveying roller, transmission shaft and the second drive motor, and described conveying roller is connected with described transmission shaft, and described transmission shaft is connected with described second drive motor;
Described limiting roll mechanism comprises limiting roll, the 3rd drive motor and guidance set, and described 3rd drive motor can move up and down for driving described limiting roll; Described guidance set is arranged on described limiting roll;
Described guidance set comprises the second orienting lug and the second angle sheave, and described second angle sheave is arranged on described second orienting lug, rolls for the outside surface along described pipe under test; Distance between the spigot surface of described second orienting lug and the outside surface of described pipe under test increases gradually along the direct of travel of reverse described pipe under test.
10. pipe wall thickness testing system according to claim 9, it is characterized in that, described centering stop means is provided with the 3rd drive motor for driving described conveying roller to move up and down.
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