CN104251879A - Austenitic stainless pipe inner wall oxide skin nondestructive testing device - Google Patents
Austenitic stainless pipe inner wall oxide skin nondestructive testing device Download PDFInfo
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- CN104251879A CN104251879A CN201410424345.XA CN201410424345A CN104251879A CN 104251879 A CN104251879 A CN 104251879A CN 201410424345 A CN201410424345 A CN 201410424345A CN 104251879 A CN104251879 A CN 104251879A
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Abstract
The present invention discloses an austenitic stainless pipe inner wall oxide skin nondestructive testing device comprising a probe, an electromagnetic detector and a data processor which are sequentially electrically connected; the probe comprises a casing, a permanent magnet, an induction coil, an installation part and two scan parts, induction coil winds the permanent magnet and is installed in the casing together with the permanent magnet, the installation part is embedded in the casing, one ends of the two scan parts are respectively movably connected with the same end of the installation part, when the probe works, an included angle between the two scan parts is adjusted to detect pipes with different specifications. Compared with the prior art, the detection device has the advantages of compact structure, fast detection speed and accurate and reliable detection result, the probe scans a to-be-detected pipe by the scan parts, and does not contact with the to-be-detected pipe, the probe abrasion in the long term detection can be avoided, the service life of the probe is improved, the use cost is reduced, the included angle between the two scan parts is adjustable, the austenitic stainless pipe inner wall oxide skin nondestructive testing device is flexible in use, and is suitable for various specifications of pipelines; therefore, the application prospect is very wide.
Description
Technical field
The present invention relates to a kind of pick-up unit, specifically, relate to a kind of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device, belong to technical field of nondestructive testing.
Background technology
Dynamic Non-Destruction Measurement and non-destructive detection technique, do not destroying under the prerequisites such as the original state of test substance, chemical property exactly, for obtaining the detection method that physics, the chemical corps intelligences such as content, character or the composition relevant with the quality of determinand adopt.Dynamic Non-Destruction Measurement is the application project technology grown up on the basis of the subjects such as physics, material science, fracturing mechanics, mechanical engineering, electronics, data processor technology, infotech and artificial intelligence, along with modern industry and scientific and technical development, Dynamic Non-Destruction Measurement is subject to the attention of each industrial circle and scientific research department just day by day, not only in production quality control, its irreplaceable effect, by numerous scientific and technical personnel and business circles are admitted, and also to play an important role the inservice inspection of equipment in running.
Non-Destructive Testing utilizes the characteristics such as sound, light, magnetic and electricity, under the prerequisite do not damaged or do not affect detected object usability, to detect in checked object whether existing defects or unevenness, provide defect size, position, the information such as character and quantity, possesses following characteristics usually: first is have non-destructive, and it can not damage the usability of detected object when detecting, second has comprehensive, is non-destructive, therefore allows the complete detection of detected object being carried out to 100% owing to detecting, this be destructive detect out of the question, 3rd has whole process, destructive detection is generally only applicable to detect starting material, as the stretching generally adopted in mechanical engineering, compression, bend, destructive test is all carried out for manufacture starting material, for finished product with at articles for use, unless do not prepared to allow it continue to be on active service, otherwise destructiveness can not be carried out detect, and Non-Destructive Testing is not because damaging the usability of detected object, therefore, it not only can to manufacture starting material, each middle process link, detect until final finished product carries out whole process, also can detect in commission equipment.
Thermal power plant's extra-supercritical unit and supercritical unit refer to the pressure of working medium in boiler.Working medium in boiler is all water, and the critical parameters of water are: 22.064MPa, 373.99 DEG C; When this pressure and temperature, the density of water and steam is identical, just cry the critical point of water, in stove, power pressure is just subcritical boiler lower than this pressure, being greater than this pressure is exactly super critical boiler, and in stove, vapor (steam) temperature is not less than 593 DEG C or vapor pressure and is not less than 31MPa and is called as ultra supercritical.Super (super-) critical fired power generating unit has the effect of energy-conservation and environmental protect significantly, and extra-supercritical unit is compared with supercritical unit, and the thermal efficiency will improve 12%, within 1 year, just can save 6000 tons of fat coals.Following construction of fire and electricity will mainly develop overcritical (SC) and ultra supercritical (USC) fired power generating unit of high-level efficiency high parameter, and they have obtained investigation and application widely in developed country.At present along with the operation of increasing super (super-) critical fired power generating unit, in boiler high temperature heating surface, use has high heat-resisting widely, high strength Austenitic stainless steel pipe, as TP347H, SUP304, the materials such as HR3C, but because stainless linear expansion coefficient is large compared with common alloy steel, in its operation, the linear expansion coefficient of the oxide layer that inwall produces is little, therefore the inner wall oxide skin that stainless steel autoxidation generates in boiler long-time running can come off in boiler shutdown process, the lower bend part that the oxide come off often is deposited in high temperature superheater or high temperature reheater pipe under gravity forms blocking, when blocking serious, very likely there is overtemperature tube burst in the short time (general one week) after powering, at present both at home and abroad thermal power plant there occurs and has a lot ofly piled up the pipe explosion accident caused because of oxide shedding, have a strong impact on the safe and stable operation of Thermal Power Enterprises, affect resident or enterprise's normal electricity consumption, tremendous economic is caused to lose also to Thermal Power Enterprises self.
In order to solve the problem, lot of domestic and international enterprise has set about research and has been applied in the detection of Austenitic stainless steel pipe by Dynamic Non-Destruction Measurement, thus effectively avoids that boiler tubing occurs again and block even booster phenomenon.A kind of electromagnetic detector of stainless-steel tube scale thickness disclosed in Chinese utility model patent 200920301739.0, this pick-up unit applies the magnetic field that can regulate from nonmagnetic stainless-steel tube outer wall by field coil or permanent magnet, make the spuious magnetic signal that the ferromagnetism oxide skin magnetization in pipe produces, magnetodiode between magnet and tube wall can be installed in or this kind of magneto sensor of Hall element detects, by this pick-up unit is circumferentially rotated in 360 degree of directions, the spuious magnetic signal that the oxide skin of detected pipeline on the different radian of xsect produces can be changed into electric signal by magneto sensor, the stereo-picture of the locus that simulation pipeline scale inside is piled up is converted the electrical signal to again by the powerful data-handling capacity of data processor, this kind of pick-up unit can be exactly, three-dimensionally simulate the stereo-picture of stainless-steel tube scale inside.But the detecting element usually adopted due to this pick-up unit is magnetodiode or Hall element, these two kinds of magneto sensors all need additional power source to provide components and parts operating voltage, and these two kinds of elements are all vulnerable to the impact of environment temperature thus there is temperature drift, need to provide additional compensating circuit, therefore make the circuit part of sensor become complicated, increase the manufacture difficulty of sensor; And this magneto sensor affects very large by magnet and element distances, because magneto sensor is encapsulated between magnetic pole and tube wall, in long-term detection, Front distance need rub stainless steel tube wall repeatedly, before element, the top layer of encapsulation is easy to wear thinning, not only have impact on Detection results, also reduce serviceable life, add use cost; In addition, this pick-up unit adapts to the detection of different size pipeline by a length adjustment mechanism, and applicable surface is comparatively wide, but this kind of length adjustment mechanism operation is more complicated, wastes time and energy, is unfavorable for applying.
And for example a kind of detecting probe for oxide in austenitic pipe disclosed in another Chinese utility model patent 201020166974.4, comprise yoke, permanent magnet and coil, when detecting by winding around on permanent magnet, and U-shaped yoke is carried out scanning slip to stainless-steel tube outer wall, in managing during non-scale, within the scope of the encirclement of winding around, magnetic flux is constant, when there is oxide skin, oxide skin is magnetized thus produces stray magnetic field, magnetic flux within the scope of winding around encirclement is changed, thus in winding around, self-induction electromotive force is produced, by additional electromagnetic detector, electrical signal of reaction is shown detection data over the display after analog integration.This kind of detection probe can the presence or absence of detector tube internal oxidition skin, but cannot reflect the space pattern that pipe internal oxidition skin is piled up exactly; And this detection probe volume is comparatively large, is unfavorable for operation in narrow space, yoke moulding is complicated, manufacture difficulty, and manufacturing cost is higher; In addition, the geomery of this detection probe is fixed, unadjustable, and be not suitable for the detection of the different pipeline of standard caliber, applicable surface is less.
Therefore, simple, the compact conformation of a kind of principle and the adjustable austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device of probe size are urgently released.
Summary of the invention
For the problems referred to above that prior art exists, the object of this invention is to provide a kind of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device, this structure of the detecting device is compact, principle is simple, flexible operation, and testing result accurately and reliably, and probe size is adjustable, applicable surface is extremely wide.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device, comprises the probe, electromagnetic detector and the data processor that are electrically connected in turn; Wherein, probe comprises housing, permanent magnet, inductive coil, installation portion and two scanner sections, inductive coil to be wrapped on permanent magnet and to be arranged in housing with permanent magnet, installation portion is embedded on housing, one end of two scanner sections is flexibly connected with same one end of installation portion respectively, during probe work, by regulating the angle between two scanner sections to detect the pipeline of different size.
Preferably, the scanner section of probe is used for directly contacting with tested pipeline, and along tested pipeline scanning, probing shell can be avoided in long-term detection to occur wearing and tearing, improve the serviceable life of probe, reduce use cost.
More preferably, for ensureing scanner section and the housing stable connection of probe, installation portion is embedded in housing and is spirally connected with housing.
Preferably, two scanner sections and installation portion is in T shape or Y-shaped arranges, the surface of contact of scanner section and tested pipeline is concaved circular cambered surface.
More preferably, connected between two scanner sections by bolt and nut, nut is first unscrewed before using by probe, regulate the angle between two scanner sections, then fastening nut realizes according to the caliber of tested pipeline fastening.
Preferably, the material of scanner section adopts the magnet steel that magnetoconductivity is high.
Preferably, the inductive coil of probe is electrically connected in turn with electromagnetic detector and data processor.
Preferably, in order to save space, be convenient to install, permanent magnet is cylindric.
More preferably, permanent magnet adopts ndfeb magnet.
Preferably, inductive coil adopts enameled wire.
Preferably, in order to reduce the general assembly (TW) of probe, to alleviate the burden of operator, case material adopts rigid plastic.
More preferably, housing is rectangular parallelepiped housing or cylindrical shell.
More preferably, housing is cylindrical shell.
Further preferably, be provided with a cylindrical hollow cavity in housing, the permanent magnet being wound with inductive coil is arranged in cavity.
Still more preferably, in order to improve permanent magnet installation stability in the housing, the non-magnetic glue of one deck between permanent magnet and housing, is provided with.
Preferably, in order to make this pick-up unit better hold, facilitate manual hand manipulation, housing outer surface is provided with the arc groove being convenient to hold.
Compared with prior art, the invention provides a kind of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device, this structure of the detecting device is compact, principle is simple, convenient processing and manufacture, possesses good economy, and detection sensitivity is high, speed is fast, can on data processor three-dimensionally simulative tube internal oxidition skin pile up situation, thus reflect the accumulation pattern of pipe internal oxidition skin exactly, image and directly perceived, testing result accurately and reliably, in addition, probe is by scanner section scanning tested pipeline, make directly not contact between probing shell with tested pipeline, probing shell wearing and tearing in long-term detection can be avoided, improve the serviceable life of probe, reduce use cost, and angle is adjustable between two scanner sections, use flexibly, the pipeline of suitable for various size, convenient to operation during detection, time saving and energy saving, therefore, good application prospect and promotional value is possessed.
Annex explanation
Fig. 1 is the preferred implementation connection diagram of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device provided by the invention;
Fig. 2 is the structural representation of popping one's head in the preferred implementation of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device provided by the invention;
Fig. 3 is the structural representation of scanner section in the preferred implementation of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device provided by the invention.
Embodiment
Do to illustrate in detail, intactly further to the present invention below in conjunction with embodiment and accompanying drawing.
Fig. 1 to Fig. 3 is the preferred implementation schematic diagram of a kind of austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device provided by the invention.As shown in Figure 1 to Figure 3, this austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device comprises the probe 1, electromagnetic detector 2 and the data processor 3 that are electrically connected in turn, wherein, probe 1 comprises cylindrical shell 101, cylindric ndfeb magnet 102, inductive coil 103, installation portion 104 and two scanner sections 105.
A cylindric hollow cavity 1011 is provided with in housing 101, inductive coil 103 to be wrapped on ndfeb magnet 102 and to be arranged in the cavity 1011 of housing 101 with ndfeb magnet 102, and inductive coil 103 is electrically connected in turn with between electromagnetic detector 2 and data processor 3.One end of two scanner sections 105 is flexibly connected with same one end of installation portion 104 respectively, for directly contacting with tested pipeline 4, and along tested pipeline 4 scanning, in order to mate the shape of pipeline outer wall, realization fits tightly, and scanner section 105 is concaved circular cambered surface with the surface of contact of tested pipeline 4; Particularly, connected by bolt 1051 between two scanner sections 105 and can rotate around bolt 1051, realizing fastening by a coupling nut 1052 after regulating the angle between two scanner sections 105; When using probe 1, by regulating the angle between two scanner sections 105 to detect the pipeline of different tube diameters.In addition, the junction of two scanner sections 105 is fixed on installation portion 104, and the arrangement in Y-shaped, namely scanner section 105 is arranged on one end of housing 101 by installation portion 104, in order to ensure the connective stability of scanner section 105 and housing 101, installation portion 104 is embedded on housing 101 and is also spirally connected with it.
It is worth mentioning that, in order to improve the installation stability of ndfeb magnet 102 in housing 101, between ndfeb magnet 102 and housing 101, being provided with the non-magnetic glue (not shown) of one deck; In order to make this pick-up unit better hold, facilitating manual hand manipulation, the outside surface of housing 101 being also provided with the arc groove 1012 being convenient to hold, operator's hand-holdable probe 1 pair of tested pipeline 4 when detecting carries out scanning.
The specific operation process of this austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device is: operator's hand hold transducer 1, corresponding to the caliber of tested pipeline 4 two scanner sections 105 be adjusted to a proper angle and implement fastening, the outer wall being close to tested pipeline 4 again carries out scanning, in scanning process, ndfeb magnet 102 makes pipe internal oxidition skin magnetize and produces stray magnetic field, therefore the magnetic flux be wrapped within the scope of inductive coil 103 encirclement on ndfeb magnet 102 is made to change, according to Ferrari law, the change of magnetic flux will make to produce induction electromotive force in inductive coil 103, the output terminal of such inductive coil 103 can obtain with 1 contact region of popping one's head near oxide skin electric signal, recycling probe rotates a circle around the axis of tested pipeline 4, thus obtain the different electrical signals of piling up the circumferentially tangent plane distribution that degree difference produces with oxide skin, again the electric signal that inductive coil 103 exports is carried out digital integration process and become digital signal, and transfer to data processor 3 upper computer software and form the circle that a simulation stainless-steel tube scale inside piles up and cut picture, then mobile probe 1 to advance a segment distance along stainless-steel tube axis direction, again by probe 1 around tubular axis center line rotating 360 degrees, equally inductive coil 103 two ends formed analog electrical signal through digital integration and data processor image imaging processing, namely the spacing wave of one section of pipe internal oxidition skin is obtained, last Input Data Process system can form by software process quality the solid figure that a simulative tube internal oxidition skin piles up pattern, image and directly perceived.
Finally be necessary described herein: above embodiment is only for being described in more detail technical scheme of the present invention; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.
Claims (9)
1. an austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device, is characterized in that: comprise the probe, electromagnetic detector and the data processor that are electrically connected in turn; Probe comprises housing, permanent magnet, inductive coil, installation portion and two scanner sections, inductive coil to be wrapped on permanent magnet and to be arranged in housing with permanent magnet, installation portion is embedded on housing, and one end of two scanner sections is flexibly connected with same one end of installation portion respectively.
2. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: installation portion is embedded in housing and is spirally connected with housing.
3. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, be is characterized in that: connected by bolt and nut between two scanner sections.
4. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: two scanner sections and installation portion is in T shape or Y-shaped arranges, and the surface of contact of scanner section and tested pipeline is concaved circular cambered surface.
5. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: the material of scanner section is magnet steel.
6. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: the inductive coil of probe is electrically connected in turn with electromagnetic detector and data processor.
7. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: permanent magnet adopts ndfeb magnet.
8. austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device according to claim 1, is characterized in that: housing is rectangular parallelepiped housing or cylindrical shell.
9., according to the arbitrary described austenic stainless steel inside pipe wall oxide skin the cannot-harm-detection device of claim 1-8, it is characterized in that: housing outer surface is provided with the arc groove being convenient to hold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410424345.XA CN104251879A (en) | 2014-08-26 | 2014-08-26 | Austenitic stainless pipe inner wall oxide skin nondestructive testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410424345.XA CN104251879A (en) | 2014-08-26 | 2014-08-26 | Austenitic stainless pipe inner wall oxide skin nondestructive testing device |
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| CN201410424345.XA Pending CN104251879A (en) | 2014-08-26 | 2014-08-26 | Austenitic stainless pipe inner wall oxide skin nondestructive testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372323A (en) * | 2015-12-08 | 2016-03-02 | 中电投科学技术研究院有限公司 | Novel oxide skin calibration series test block |
| CN113566998A (en) * | 2021-09-23 | 2021-10-29 | 南通东成智能化设备安装有限公司 | Nondestructive inner wall detection device for stainless steel pipe |
-
2014
- 2014-08-26 CN CN201410424345.XA patent/CN104251879A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372323A (en) * | 2015-12-08 | 2016-03-02 | 中电投科学技术研究院有限公司 | Novel oxide skin calibration series test block |
| CN113566998A (en) * | 2021-09-23 | 2021-10-29 | 南通东成智能化设备安装有限公司 | Nondestructive inner wall detection device for stainless steel pipe |
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