CN211786156U - Magnetic field focusing type buried metal pipeline probe device based on transient electromagnetic method - Google Patents
Magnetic field focusing type buried metal pipeline probe device based on transient electromagnetic method Download PDFInfo
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- CN211786156U CN211786156U CN202020838756.4U CN202020838756U CN211786156U CN 211786156 U CN211786156 U CN 211786156U CN 202020838756 U CN202020838756 U CN 202020838756U CN 211786156 U CN211786156 U CN 211786156U
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Abstract
The utility model relates to a magnetic field focus type buries ground metal pipeline probe unit based on transient electromagnetic method, including well low frequency transient electromagnetism appearance, receiving coil and a plurality of excitation coil all distribute in same plane, and a plurality of excitation coil all uses receiving coil to set up as central evenly distributed at receiving coil's position all around, and receiving coil and a plurality of excitation coil all are connected with well low frequency transient electromagnetism appearance through the cable. The utility model discloses a brand-new probe unit based on transition electromagnetic method utilizes the focus function between a plurality of excitation coils, on the basis that does not increase the probe size, realizes burying the detection of metal pipeline to thick buried depth and thick wall thickness.
Description
Technical Field
The utility model relates to a ground metal pipeline nondestructive test technical field is buried to basic chemical industry and petroleum refining industry, especially relates to a magnetic field focus type buries ground metal pipeline probe unit based on transient electromagnetic method.
Background
With the rapid development of domestic industry, buried metal pipelines have been widely used in industrial production and industrial transportation. Along with the increase of underground pipe network, the increase of pipeline input live time, buried pipeline can receive the effect of secret adverse circumstances and take place to corrode. The consequences of corrosion are loss of metal content of the pipeline, potential safety hazards exist when the pipeline strength is reduced, corrosion perforation of the pipeline can be caused, leakage of transport media can be caused, and disastrous economic damage and environmental damage can be caused. Therefore, in order to ensure the safe operation of the buried pipeline and reduce the economic loss, the detection work needs to be carried out on the in-service buried pipeline.
The buried metal pipeline detection technology based on the transient electromagnetic method can realize the average wall thickness detection of the buried metal pipeline under the conditions of no excavation and no production stop. The basic technical principle of transient electromagnetic detection of buried metal pipelines is as follows: a probe (comprising an exciting coil and a receiving coil) is placed right above a buried metal pipeline, a step pulse signal is sent to the underground through a transmitting coil, and a horizontal and vertical stable initial magnetic field (primary magnetic field) is established around the coil and in the ground space by exciting current; after the signal is turned off, the initial magnetic field disappears immediately, and an induction attenuation magnetic field (a secondary magnetic field) opposite to the direction of the initial magnetic field is formed in the space (including the measured pipe body) around the coil in an induction mode, wherein the secondary magnetic field is related to parameters such as the pipe wall thickness, the pipe diameter and the material of the measured pipe; the receiving coil is used for receiving the attenuation signal of the secondary magnetic field, and the signal is analyzed, so that parameters such as the average thickness of the pipe wall of the buried pipeline in the electromagnetic field coverage range can be obtained quantitatively, and the corrosion defect can be found and positioned. Probes for transmitting and receiving signals in the prior art generally adopt rectangular or annular coils (see fig. 1-2) with a planar structure, in order to increase the output energy of a transmitting coil, the size of the coil is generally larger than 1 meter, and the thicker the buried depth of a buried pipeline is, the larger the size of the coil is. The coverage range of the electromagnetic field is increased by increasing the size of the coil, the coverage range of the electromagnetic field is also increased, and the coverage range of the electromagnetic field generated by taking a probe formed by a square coil as an example is a square area with the side length approximately equal to (L +2h), wherein L is the side length of the square coil, and h is the buried depth of the buried pipeline. Since this method can only obtain the average wall thickness of the pipe within the electromagnetic field coverage, its detection resolution and accuracy will be rapidly degraded when the coil size is too large. To obtain test data with a certain accuracy, the size of the probe would have to be reduced, which would reduce the range of depths and wall thicknesses that can be tested for buried metal pipelines.
In view of the above-mentioned defects, the present designer is actively making research and innovation to create a magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method, so that the device has more industrial utilization value.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a magnetic field focus type buries ground metal pipeline probe unit based on transition electromagnetic method.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a magnetic field focusing type buried metal pipeline probe device based on a transient electromagnetic method comprises a medium-low frequency transient electromagnetic instrument, a receiving coil and a plurality of excitation coils, wherein the receiving coil and the plurality of excitation coils are distributed in the same plane, the plurality of excitation coils are uniformly distributed around the receiving coil by taking the receiving coil as a center, and the receiving coil and the plurality of excitation coils are connected with the medium-low frequency transient electromagnetic instrument through cables.
As a further improvement of the utility model, a plurality of exciting coils are connected in series with the middle-low frequency transient electromagnetic instrument.
As a further improvement of the utility model, a plurality of exciting coils are connected in parallel with the middle and low frequency transient electromagnetic instrument.
As the utility model discloses a further improvement, excitation coil's quantity is 2 ~ 8, and excitation coil's shape is rectangle or circular structure setting.
As the further improvement of the utility model, the shape of the exciting coil is a square structure, and the side length range of the exciting coil of the square structure is 0.5-2 m.
As the further improvement of the utility model, the number of the exciting coils is 6, and the side length of the exciting coil with a square structure is 0.5 m.
As a further improvement of the utility model, the shape of the receiving coil is a rectangular or circular structure.
As a further improvement, the shape of the receiving coil is a square structure, and the side length range of the receiving coil with the square structure is 1-2 m.
As the utility model discloses a further improvement, receiving coil and a plurality of exciting coil are the enameled wire winding and form, and receiving coil and a plurality of exciting coil's enameled wire line footpath is 0.8 ~ 2mm, and receiving coil and a plurality of exciting coil's enameled wire winding number of turns is 20 ~ 100 circles.
As the utility model discloses a further improvement, receiving coil and a plurality of exciting coil's enameled wire line footpath is 1mm, and receiving coil and a plurality of exciting coil's enameled wire winding number of turns is 50 circles.
Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:
the utility model discloses a brand-new probe unit based on transition electromagnetic method utilizes the focus function between a plurality of excitation coils, on the basis that does not increase the probe size, realizes burying the detection of metal pipeline to thick buried depth and thick wall thickness.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a rectangular probe apparatus of the type commonly found in the prior art;
FIG. 2 is a schematic diagram of a circular probe apparatus of the type commonly found in the prior art;
fig. 3 is a distribution schematic diagram of the magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method of the present invention;
fig. 4 is a distribution schematic diagram of a first embodiment of the magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method of the present invention;
fig. 5 is a distribution schematic diagram of a second embodiment of the magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method of the present invention.
In the drawings, the meanings of the reference numerals are as follows.
1 medium and low frequency transient electromagnetic instrument 2 receiving coil
3 exciting coil
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Examples
As shown in figures 3 to 5 of the drawings,
the utility model discloses a brand-new magnetic field focus type probe unit based on transition electromagnetic method, including 2-8 exciting coil 3 that are used for the transmitting signal and 1 receiving coil 2 that is used for the received signal, through the change to the exciting coil 3 of different quantity, different structure, different positions, can realize different focusing effects to can adapt to the detection of different buried depth and different wall thickness. The composition structure of the exciting coil 3 can adopt two forms of series connection and parallel connection to form different focusing modes; the serial connection mode can realize the detection of the buried metal pipeline with the buried depth of 1.5-3 meters and the wall thickness of less than 50mm, and the parallel connection mode can realize the detection of the buried metal pipeline with the buried depth of 0.5-1.5 meters and the wall thickness of less than 30 mm.
In the detection process, the probe is placed on the ground right above a buried metal pipeline, and an excitation coil 3 in the probe device receives a step pulse signal from medium-low frequency transient electromagnetic equipment through a cable and transmits the signal to the underground; the excitation current will create a horizontal, vertical stable initial magnetic field (primary magnetic field) around the coil and in the earth space; after the signal is turned off, the initial magnetic field disappears immediately, and an induction attenuation magnetic field (a secondary magnetic field) opposite to the direction of the initial magnetic field is formed in the space (including the measured pipe body) around the coil in an induction mode, wherein the secondary magnetic field is related to parameters such as the pipe wall thickness, the pipe diameter and the material of the measured pipe; the receiving coil is used for receiving the attenuation signal of the secondary magnetic field, and the signal is analyzed, so that parameters such as the average thickness of the pipe wall of the buried pipeline in the electromagnetic field coverage range can be obtained quantitatively, and the corrosion defect can be found and positioned.
According to the technical principle of the transient electromagnetic method, the smaller the size of the probe device is, the smaller the electromagnetic field coverage area on the pipeline is, and the higher the detection precision and resolution are; however, as the size of the probe device is reduced, the excited current and energy are reduced, the penetration capability of an electromagnetic field is reduced, and the detection of the buried depth and the penetration wall thickness are also reduced. The utility model discloses a parallelly connected or the series connection form of a plurality of exciting coil 3 that adopt, constitute the coil array by a plurality of exciting coil 3, through the relevant parameter of adjustment each coil, the position, coil connected mode and coil quantity, can make its electromagnetic field stack, in the electromagnetic field stack region, the electromagnetic field intensity obtains the reinforcing, it increases to detect buried depth degree and penetration wall thickness ability, and simultaneously, the magnetic field in electromagnetic field stack region obtains the focus, coverage can be controlled in less within range, it also obtains improving to detect precision and resolution ratio. Therefore, the utility model discloses an utilize the coil array that a plurality of exciting coil 3 are constituteed, realized the stack and the focus of electromagnetic field, increased detection precision and resolution ratio when increasing to detect and bury ground degree of depth and pierce through the wall thickness ability.
The magnetic field focusing type probe device comprises 2-8 exciting coils 3 and 1 receiving coil 2, wherein the exciting coils 3 and the receiving coils 2 are distributed in a plane, and the exciting coils 3 are uniformly distributed around the receiving coils 2 by taking the receiving coils as the center. The receiving coil 2 mainly receives electromagnetic field signals of secondary magnetic field superposition parts generated by all the peripheral exciting coils 3, and the superposition of the electromagnetic field signals enhances the signals and increases the buried depth and wall thickness range of detection; due to the adoption of the plurality of exciting coils 3, the size of a single exciting coil 3 is reduced, the coverage range of the electromagnetic signal superposition part is reduced, and the purposes of improving the detection precision and the resolution ratio are achieved.
Since the electromagnetic field generated by the exciting coil 3 is related to the magnitude, direction and phase of the current flowing through the exciting coil 3, the vector direction, intensity, etc. of the focused electromagnetic field can be controlled by adjusting the structure, number, relative position, magnitude of the current and connection mode of the exciting coil 3 between the exciting coil 3 and the receiving coil 2, so that the focused electromagnetic field is directed to a set detection region.
Adjusting the structure of the exciting coil 3 and the receiving coil 2 can control the performance of magnetic field superposition and focusing. The mode of adjusting the coil structure comprises adjusting the shape and size of the coil, the wire diameter of the wound enameled wire, the number of winding turns and the like.
The shape of the coil is generally a rectangular coil or a circular coil; the smaller the size of the coil is, the smaller the coverage area is, and the higher the detection precision and the resolution are; the thicker the wire diameter of the winding enameled wire/the more the winding turns, the larger the coil inductance, the larger the current, the larger the electromagnetic field intensity, and the larger the range of the detection buried depth and the wall thickness.
The experiment verifies that: the coil shape has little influence on the superposition and focusing of electromagnetic signals; when the coil size is too small (taking a square coil as an example, when the side length is less than 0.5 meter), the detection precision and the resolution ratio are improved, but the detected buried depth is too small to be applied to the field; the wire diameter of the enameled wire is less than 0.8 mm, and when the winding turns are less than 20 turns, the detection buried depth is too small, which is not beneficial to field application.
The increased number of excitation coils 3 improves the magnetic field superposition and focusing performance. The selection of the number of the exciting coils 3 is determined according to the field conditions, including the buried depth, the buried pipeline diameter, the surrounding environment and the like, and generally about 2, less than 8.
The relative position of the exciting coil 3 and the receiving coil 2 can affect the focusing orientation of the electromagnetic field, and the exciting coil 3 is generally uniformly distributed around the receiving coil 2.
The connection mode of the exciting coil 3 comprises a series connection mode and a parallel connection mode, wherein the parallel connection mode can realize the detection of the buried metal pipeline with the buried depth of 1.5-3 meters and the wall thickness of less than 50mm, and the series connection mode can realize the detection of the buried metal pipeline with the buried depth of 0.5-1.5 meters and the wall thickness of less than 30 mm.
The utility model discloses the used middle and low frequency transient electromagnetism appearance 1 is the used transient electromagnetism appearance of ground ore exploration of being used for of market.
The utility model discloses a magnetic field focus type probe unit includes 2-8 exciting coil 3 and 1 receiving coil 2, and a plurality of exciting coil 3 and receiving coil 2 distribute in a plane, and exciting coil 3 uses receiving coil 2 as the center, evenly distributed around receiving coil 2. The exciting coil 3 and the receiving coil 2 are both connected with the medium-low frequency transient electromagnetic instrument 1 through cables.
In the using process, the probe is placed on the ground right above a buried metal pipeline, and the exciting coil 3 receives a step pulse signal from the medium-low frequency transient electromagnetic instrument 1 and transmits the signal to the ground; the receiving coil 2 receives a secondary electromagnetic field signal generated by a buried metal pipeline and transmits the electromagnetic field signal to the medium-low frequency transient electromagnetic instrument 1 through a cable; the electromagnetic field signal contains the wall thickness information of the buried metal pipeline to be detected, and the wall thickness of the buried metal pipeline can be obtained through analysis, so that the corrosion defect can be found and positioned.
The number of the exciting coils 3 is 2-8, the shape is rectangular or circular, taking a square coil as an example, and the side length range is 0.5-2 meters. The method is characterized in that selection is carried out according to the pipe diameter, the wall thickness and the buried depth of the buried metal pipeline, a square exciting coil 3 with the side length of 0.5 meter is generally selected for the buried metal pipeline with the buried depth of less than 2 meters and the wall thickness of less than 50mm, and 6 exciting coils 3 are selected according to the allowed number.
The receiving coil 2 is rectangular or circular in shape, generally larger than the size of the exciting coil 3, for example a square coil, with a side length in the range of 1-2 meters.
The exciting coil 3 and the receiving coil 2 are formed by winding enameled wires, the wire diameter of each enameled wire is 0.8-2mm, the number of winding turns is 20-100 turns, selection is carried out according to the pipe diameter, the wall thickness and the buried depth of a buried metal pipeline, the wire diameter of each enameled wire is generally selected to be 1mm, and the number of winding turns is 50 turns for the buried metal pipeline with the buried depth of less than 2 meters and the wall thickness of less than 50 mm.
The excitation coils 3 are connected in series (fig. 4) or in parallel (fig. 5).
The utility model discloses a first embodiment: the serial connection mode is that the output of one exciting coil 3 is connected with the input of the next exciting coil 3 to form a chain-type transmitting section, so that the detection of the buried metal pipeline with the buried depth of 1.5-3 meters and the wall thickness of below 50mm can be realized.
The utility model discloses the second embodiment: the parallel connection mode is that each exciting coil 3 shares an input end and an output end, and simultaneously transmits a step pulse signal, so that the detection of the buried metal pipeline with the buried depth of 0.5-1.5 meters and the wall thickness of below 30mm can be realized.
The utility model discloses to the ground metal pipeline nondestructive test field is buried in basic chemical industry and petroleum refining industry, is a time domain Electromagnetic detection Method, belongs to Transient Electromagnetic detection technique (Transient Electromagnetic Method, TEM). The transient electromagnetic technology for the buried pipeline can detect the wall thickness of the buried pipeline under the condition of no excavation and no production stop so as to find and position corrosion defects and potential safety hazard positions.
The utility model discloses go on to the probe structure of transient electromagnetism buried pipeline check out test set, realize the stack and the focus function in probe magnetic field through probe structure, 3 quantity of excitation coil and arrangement mode etc to the realization buries the detection of dark and great wall thickness pipeline deeply.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly referring to the number of technical features being grined. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected: either mechanically or electrically: the terms may be directly connected or indirectly connected through an intermediate member, or may be a communication between two elements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. Magnetic field focus type buries ground metal pipeline probe device based on transient electromagnetic method, its characterized in that, including well low frequency transient electromagnetism appearance (1), receiving coil (2) and a plurality of exciting coil (3) all distribute in same plane, a plurality of exciting coil (3) all use receiving coil (2) as the position setting all around of center evenly distributed receiving coil (2), receiving coil (2) and a plurality of exciting coil (3) all are connected with well low frequency transient electromagnetism appearance (1) through the cable.
2. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 1, wherein the plurality of exciting coils (3) are connected in series with the medium and low frequency transient electromagnetic instrument (1).
3. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 1, wherein the plurality of exciting coils (3) are connected in parallel with the medium and low frequency transient electromagnetic instrument (1).
4. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 1, wherein the number of the excitation coils (3) is 2-8, and the shape of the excitation coils (3) is a rectangular or circular structure.
5. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 4, wherein the shape of the excitation coil (3) is a square structure, and the side length range of the excitation coil (3) with the square structure is 0.5-2 m.
6. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 5, wherein the number of the excitation coils (3) is 6, and the side length of the excitation coil (3) with the square structure is 0.5 m.
7. The magnetic field focusing type buried metal pipeline probe apparatus based on the transient electromagnetic method as claimed in claim 1, wherein the receiving coil (2) is in a rectangular or circular structural arrangement.
8. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 7, wherein the receiving coil (2) is in a square structure, and the side length range of the receiving coil (2) in the square structure is 1-2 m.
9. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 1, wherein the receiving coil (2) and the plurality of exciting coils (3) are formed by winding enameled wires, the wire diameters of the enameled wires of the receiving coil (2) and the plurality of exciting coils (3) are 0.8-2mm, and the number of winding turns of the enameled wires of the receiving coil (2) and the plurality of exciting coils (3) is 20-100 turns.
10. The magnetic field focusing type buried metal pipeline probe device based on the transient electromagnetic method as claimed in claim 9, wherein the enameled wire diameter of the receiving coil (2) and the plurality of exciting coils (3) is 1mm, and the number of winding turns of the enameled wire of the receiving coil (2) and the plurality of exciting coils (3) is 50.
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| CN202020838756.4U CN211786156U (en) | 2020-05-19 | 2020-05-19 | Magnetic field focusing type buried metal pipeline probe device based on transient electromagnetic method |
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| CN112540411A (en) * | 2020-11-06 | 2021-03-23 | 云南电网有限责任公司电力科学研究院 | Grounding grid topology positioning device and method |
| CN112730598A (en) * | 2020-12-27 | 2021-04-30 | 北京工业大学 | Method for manufacturing non-excavation harmonic magnetic field focusing detection probe of buried steel pipeline |
| CN112782270A (en) * | 2020-12-19 | 2021-05-11 | 北京工业大学 | Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112540411A (en) * | 2020-11-06 | 2021-03-23 | 云南电网有限责任公司电力科学研究院 | Grounding grid topology positioning device and method |
| CN112540411B (en) * | 2020-11-06 | 2024-02-06 | 云南电网有限责任公司电力科学研究院 | Topological positioning device and method for grounding grid |
| CN112782270A (en) * | 2020-12-19 | 2021-05-11 | 北京工业大学 | Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer |
| CN112730598A (en) * | 2020-12-27 | 2021-04-30 | 北京工业大学 | Method for manufacturing non-excavation harmonic magnetic field focusing detection probe of buried steel pipeline |
| CN112730598B (en) * | 2020-12-27 | 2024-02-02 | 北京工业大学 | Manufacturing method of non-excavation harmonic magnetic field focusing detection probe for buried steel pipeline |
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