CN112782270A - Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer - Google Patents
Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer Download PDFInfo
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- CN112782270A CN112782270A CN202011512306.7A CN202011512306A CN112782270A CN 112782270 A CN112782270 A CN 112782270A CN 202011512306 A CN202011512306 A CN 202011512306A CN 112782270 A CN112782270 A CN 112782270A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
Abstract
The invention discloses a method for manufacturing a steel pipeline harmonic magnetic field focusing detection probe without detaching a heat insulation layer, which comprises the following steps: the device comprises an excitation coil array, a high-sensitivity magnetic sensor, a data line, an SMA radio frequency connecting line and a flexible detection probe shell. The exciting coil array is used for loading harmonic current and generating a focusing magnetic field; the SMA radio frequency connecting wire is connected with an excitation source and supplies power to the excitation coil array; the high-sensitivity magnetic sensor is used for collecting magnetic field signals and converting the magnetic field signals into voltage signals; the data line transmits the data acquired by the detection probe to the acquisition card; the flexible detection probe shell integrates the devices to achieve the purpose of detecting the defects of the pipeline. This test probe can make the harmonic magnetic field pierce through the heat preservation and focus on the pipeline body that awaits measuring to gather the magnetic field signal of the regional pipeline of excitation magnetic field signal effect, thereby realize detecting the steel pipeline in labour under the condition of not tearing open the heat preservation, this test probe simple structure, convenient operation can satisfy the engineering and detect the needs.
Description
Technical Field
The invention relates to the field of pipeline damage detection, in particular to design and manufacture of a harmonic magnetic field focusing detection instrument for a steel pipeline without dismantling a heat insulation layer, which can focus a harmonic magnetic field on the steel pipeline with the heat insulation layer and collect magnetic field signals under the working condition without dismantling the heat insulation layer to complete the detection of the pipeline, can be suitable for the detection of pipelines with different pipe diameters and different heat insulation layer thicknesses, has the advantages of simple operation, strong anti-interference capability and convenient adjustment, and can meet the detection requirements of actual engineering.
Background
The pipeline transportation is one of five transportation modes parallel to railways, highways, aviation and inland rivers, and plays a vital role in the national transportation industry. But the service life and reliability of the pipeline are seriously affected by the pipeline defects caused by the factors of pipeline corrosion lack, natural force damage, third-party damage and the like. Therefore, the regular detection of the in-service pipeline becomes an important way for guaranteeing the normal operation of the pipeline. However, when laying a pipeline, in order to avoid damage to the pipeline, it is common to coat the pipeline with a protective layer and an insulating layer, which makes the pipeline inspection more difficult. In the existing pipeline detection method, an internal detection method usually needs to be managed and stopped, and wastes time and labor; in the existing external detection method, for the pipeline with the heat-insulating layer on the outer wall, the detection range of the ultrasonic guided wave detection method is obviously shortened because the ultrasonic waves are greatly attenuated in the heat-insulating layer; the pulse eddy current method, the microwave detection method and the infrared detection method can avoid the interference of the heat-insulating layer, but have low detection sensitivity on the corrosion of the inner wall of the pipeline, and only can detect the corrosion of the outer wall and the surface defects
Therefore, in order to detect the in-service pipeline under the working conditions of no shutdown and no removal of the insulating layer, the pipeline detection probe with good magnetic field focusing effect, simple operation and strong penetrating power needs to be invented, so that the pipeline damage detection is completed.
Disclosure of Invention
In order to solve the problems, the invention designs a steel pipeline harmonic magnetic field focusing detection probe for detecting the damage of the steel pipeline with the insulating layer on service without detaching the insulating layer. The method is simple to operate, has obvious effect and can meet the requirement of engineering detection.
The invention discloses a method for manufacturing a steel pipeline harmonic magnetic field focusing detection probe without detaching a heat insulation layer, which comprises the following steps: an exciting coil array (1), a high-sensitivity magnetic sensor (2), a data transmission line (3), an SMA coil power supply radio frequency wire (4) and a flexible detection probe shell (5), wherein,
the magnetic sensor (2) adopts a three-axis TMR linear sensor (12) which adopts a three-push-pull Wheatstone full-bridge structure design, and each Wheatstone full-bridge provides differential voltage output. The sensitivity of the sensor can reach 100mV/V/Oe, and the detection saturation magnetic field is +/-8 Oe. In design, the TMR sensor is placed in the center of the small exciting coil (11) for reasonable structure.
The manufacturing parameters of the excitation coil array (1) comprise coil shape, array form, large coil size, small coil size, coil turns and used material. The exciting coil array can enable the harmonic magnetic field to penetrate through the heat insulation layer, well focus on the tube body and enhance the detection effect.
The coil shape design is characterized in that magnetic induction intensity values of a circular coil, a rectangular coil and a triangular coil at a vertical distance of 1m under the same condition are respectively calculated according to the Biot-Saval law, the magnetic field focusing effect and the coil manufacturing difficulty are comprehensively considered, and a square shape is selected as the final coil shape.
In the array form, in order to enhance the magnetic field focusing effect, an array coil shown in fig. 4 is designed, the array coil adopts a form of combining a large coil (10) and four small coils (11), and meanwhile, a TMR magnetic sensor (12) is placed at the center of the coil, so that the winding directions of the coils are the same, the current directions are consistent, and the magnetic field focusing effect is enhanced. Meanwhile, in order to further enhance the focusing effect of the magnetic field and the penetration capacity of the magnetic field to the heat insulation layer, the coil array is designed into an arc-shaped bending form so as to adapt to the shape of the pipeline, and the coil array is attached to the heat insulation layer.
The large coil size design aims at meeting the size of most pipelines and heat insulation layers, and the pipe diameter of most pipelines with the heat insulation layers is within 400mm according to the size standard of industrial pipelines, so that the length of the large coil is designed to be half perimeter of the pipe diameter of 400mm, namely 628mm, and the width of the large coil is slightly larger than the size of the small coil.
The small coil is designed in size, and the magnetic field of the single-turn rectangular coil shown in the figure 7 is modeled by utilizing the Biot-Saval law. According to the Biao-savart law, a section of current-carrying straight wire generates a magnetic field at a certain point in space
The direction and the current direction form a right-handed spiral relationship. First, let AB ═ CD ═ 2a, AC ═ BD ═ 2b, and point P coordinates be (x, y, z), and calculate the magnetic field generated by the BC-side current as
Similarly, the magnetic induction intensity generated by the other three sides at the point P is obtained, and the magnetic field components generated by the side-carried currents are added to obtain the field intensity generated by the coil at the point P. Because the magnetic sensor is positioned at the central point of the coil, namely when x, y and z are all 0, the magnetic induction intensity at the position is calculated
According to formula 2, when a and B are equal, BzThere is an extreme value at the center of the coil, so four small coils are designed to be square, and because the size of the peripheral large coil is fixed, the size of the small coil is 100mm x 100mm in consideration of the factors of whole size manufacturing and the like. The influence of the excitation magnetic field on the sensor is reduced while the overall design is satisfied.
The coil turns are designed, according to the national standard of enameled wire GB6109, the resistance value of enameled wire with the diameter of 0.5mm is 0.08959 omega/m, the coil turns are determined to be 15-20 turns in consideration of the maximum power of the excitation source and the accuracy range of the sensor, and simultaneously, a 2 omega resistance is required to be connected in series outside the coil, so as to prevent the excitation source from being burnt due to overlarge current.
The use material, in order to avoid multiturn coil mutual interference, the enameled copper wire is chooseed for use to the winding coil material, and the transmission of electric current between the coil can be avoided to the insulating layer of conductor outsourcing.
The data line (3) comprises two J30J-37TJL rectangular connector heads (9) and a section of 30-core high-flexibility twisted-pair shielding line (8), one end of the data transmission line is connected with a socket (15) on the detection probe, and the other end of the data transmission line is connected with the data acquisition card to transmit the data acquired by the probe to the data acquisition card.
The coil power supply radio frequency wire (4) comprises two SMA-J inner screw inner needle pure copper male heads (7) and a section of RG316 radio frequency wire (6), one end of the power supply radio frequency wire is connected with a pure copper female head (14) on the detection probe, and the other end of the power supply radio frequency wire is connected with a harmonic power supply to provide harmonic current for the coil.
The flexible detection probe shell and the fixing device (5) comprise an SMA female head (14), a data transmission plug (15), a 0.5mm hard PVC plate (19), a PVC angle material (17), an aluminum alloy handle (18), an organ cover (16) and a nylon binding band (20). In order to avoid the influence on the detection magnetic field, all parts of the shell are made of nonmagnetic materials, and the shell is connected in a gluing mode or a nylon bolt and nut mode, so that the use of magnetic materials is reduced as far as possible. .
The coil power supply SMA female head (14) adopts two SMA-K outer screw inner hole pure copper female heads, the wiring ends of the two SMA female heads are respectively connected with the current input and output ends of the exciting coil, and the threaded end is connected with the power supply radio frequency wire male head (7) and used for supplying power to the exciting coil array (1).
The data transmission plug (15) adopts a J30J-37ZKP rectangular connector socket, the connector is small in size, adopts a non-magnetic material, can reduce interference on a detection probe, and is provided with 37 wiring terminals, and wiring terminals 1-24 are connected with data output ends of four magnetic sensors (2) and used for transmitting data, and shielding network cables are wrapped outside the wiring terminals to reduce interference in the data transmission process. The lines 30-33 are connected with the VCC pin of the sensor, and the lines 34-37 are connected with the GND pin to supply power for the magnetic sensor.
The invention combines the rectangular coil array and the high-sensitivity magnetic sensor, integrates the rectangular coil array and the high-sensitivity magnetic sensor on a shell made of nonmagnetic materials, manufactures a harmonic magnetic field focusing detection probe, enables a magnetic field to penetrate through a heat insulation layer by a magnetic focusing method, acts on a pipe wall, collects magnetic field signals, converts the magnetic field signals into voltage signals and outputs the voltage signals to an acquisition card, thereby judging the damage state of the pipeline. The terminals of the sensor and the coil are integrated through the wiring terminals, so that the sensor is simple to use and convenient to operate.
Compared with the prior art, the invention has the beneficial effects that:
1. the pipeline with the heat-insulating layer can be detected, so that economic loss caused by shutdown and removal of the heat-insulating layer can be reduced;
2. the array coil is adopted, and the coil is bent and attached to the surface of the pipeline, so that the magnetic field focusing effect is enhanced, the detection precision is improved, and meanwhile, the penetrability of the heat-insulating layer is increased;
3. the flexible shell can be well attached to the heat-insulating layer of the pipeline, the length of the fixed nylon belt is adjusted, so that the probe can be attached to pipelines with different pipe diameters, and the adaptability is high;
4. the input and output ends of the coil, the sensor data output pin and the sensor power supply pin are respectively integrated on the wiring terminal, so that the operation is simple during use.
Drawings
Fig. 1 is a schematic diagram of the overall structure according to the embodiment of the present invention:
FIG. 2 is a schematic diagram of an SMA RF connection line according to an embodiment of the present invention:
FIG. 3 is a schematic diagram of a data line according to an embodiment of the present invention:
fig. 4 is a schematic diagram of an array coil according to an embodiment of the present invention:
fig. 5 is a schematic diagram of a flexible housing and a fixing device according to an embodiment of the invention:
FIG. 6 is a schematic diagram of a harmonic magnetic field focusing detection probe for a steel pipeline without dismantling an insulating layer.
Fig. 7 is a schematic diagram of modeling the magnetic field of a coil according to an embodiment of the present invention.
In the figure, an excitation coil array (1), a high-sensitivity magnetic sensor (2), a data line (3), an SMA radio frequency line (4), a flexible shell (5), an RG316 radio frequency line (6), an SMA inner screw male head (7), a 30-core high-flexibility twisted pair shielding line (8), a rectangular connector plug (9), a large rectangular coil (10), a small rectangular coil (11), a TMR magnetic sensor (12), a sensor circuit board (13), an SMA outer screw inner screw female head (14), a rectangular connector socket (15), an organ cover (16), a PVC angular connecting plate (17), an aluminum alloy handle (18) and a PVC thin plate (19) nylon fixing bandage (20).
Detailed Description
The present invention will now be described in further detail by way of specific examples in conjunction with the accompanying drawings.
As shown in FIG. 1, FIG. 1 shows a steel pipeline harmonic magnetic field focusing detection probe for a non-disassembled thermal insulation layer, which is designed by the invention, and comprises an excitation coil array (1), a high-sensitivity magnetic sensor (2), a data transmission line (3), an SMA coil power supply radio frequency wire (4) and a flexible detection probe shell (5). The excitation coil array (1) and the high-sensitivity magnetic sensor (2) are fixed on the flexible detection probe shell (5) in an adhesive mode and are connected with a wiring terminal on the shell. The data transmission line (3) is connected with the detection probe and the acquisition card through a rectangular connector plug (9) and transmits data measured by the probe to the acquisition card. The SMA radio frequency wire (4) is connected with a detection probe and an excitation source through an SMA outer screw inner hole female head (14) and an inner screw inner needle male head (7) to supply power for the excitation coil array (1) in the probe.
As shown in fig. 2, the data line (3) comprises two J30J-37TJL rectangular connector plugs (9) and a section of 30-core high-flexibility twisted pair shield wire (8).
As shown in fig. 3, the SMA coil power supply radio frequency wire (4) comprises two internal thread internal needle male heads (7) and a section of RG316 radio frequency wire (6).
As shown in fig. 4, the excitation coil array includes four small rectangular coils (12), one large rectangular coil (11), and four high-sensitivity magnetic sensor modules (2). In order to ensure the detection precision, the TMR high-sensitivity magnetic sensor (12) cannot be exposed to the external environment for a long time, so when detection is not needed, the TMR high-sensitivity magnetic sensor needs to be stored in a magnetic shielding barrel, and when detection is needed, the sensor is mounted on a sensor circuit board (13). The TMR high-sensitivity magnetic sensor (12) and the sensor circuit board (13) adopt a direct-insert connection mode, and are easy to disassemble and assemble.
As shown in fig. 5, the flexible shell comprises two SMA external screw inner hole female heads (14), a rectangular connector socket (15), an organ cover (16), a PVC angle connecting plate (17), an aluminum alloy handle (18) and a PVC thin plate (19). Wherein, organ cover (16) can be crooked flexible, and PVC sheet metal (19) can be buckled, therefore detect probe can laminate on the pipeline heat preservation. Meanwhile, the organ cover (16) is connected with the PVC angle-shaped connecting plate (17) through bolts and nuts, so that the magnetic sensor (13) in the probe can be conveniently mounted and dismounted.
As shown in FIG. 6, the steel pipeline harmonic magnetic field focusing detection probe designed for the invention comprises a detection probe, a fixing device (20), a data wire (3) and an SMA radio frequency wire (4). The detection probe is fixed on the pipeline insulation layer through a fixing device (20), the data line (3) is connected with the detection probe through a rectangular connector plug (9), and the SMA radio frequency line (4) is connected with the detection probe and an excitation source through an SMA outer screw inner hole female head (14) and an inner screw inner needle male head (7).
The detection steps by using the harmonic magnetic field focusing detection probe are as follows:
(1) taking out the TMR magnetic sensor (12) from the magnetic shielding barrel, opening the organ cover (16), inserting the sensor into a straight-inserting female seat on a sensor circuit (13), and fixing the organ cover (16) and a PVC angle connecting plate (17) by bolts and nuts;
(2) the detection probe is placed on the heat-insulating layer of the pipeline to be detected, and the tightness degree of the fixing device (20) is adjusted according to the heat-insulating layer, so that the probe is attached to the heat-insulating layer of the pipeline and can freely move along the axial direction of the pipeline;
(3) an SMA radio frequency wire (4) is used for connecting the excitation source with the detection probe, and a data wire (3) is used for connecting the acquisition card with the detection probe;
(4) opening the detection equipment, and moving the detection probe above the pipeline along the same direction at a constant speed for multiple times to finish detection;
(5) after the detection is finished, the TMR magnetic sensor (12) is detached, and the shielding barrel is put back, so that the external environment is prevented from interfering the accuracy of the sensor, and the next experiment is influenced.
The invention designs and manufactures a steel pipeline harmonic magnetic field focusing detection probe without detaching a heat insulation layer by combining a rectangular coil array and a magnetic sensor and integrating the rectangular coil array and the magnetic sensor on a flexible shell. The magnetic field focusing effect is enhanced by adopting the coil array and the arc-shaped coil, and the capability of the magnetic field penetrating through the heat insulation layer is increased, so that the detection precision is increased. The output pin of the sensor is integrated on a plug and is connected to the acquisition card through a data line, so that the use is convenient. The probe is fixed on the heat-insulating layer through the fixing device, the probe is moved along the axial direction of the pipeline, the detection of the pipeline can be completed, and the probe can be adapted to the thicknesses of different pipe diameters and heat-insulating layers by adjusting the fixing device during installation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a steel pipeline harmonic magnetic field focus test probe for not tearing heat preservation open which characterized in that includes: the device comprises an excitation coil array (1), a high-sensitivity magnetic sensor (2), an SMA radio frequency connecting wire (3), a data wire (4) and a flexible detection probe shell (5);
the excitation coil array (1) is a coil array consisting of a large coil (10) and four small coils (11); the harmonic magnetic field can be generated under the excitation of harmonic current;
the high-sensitivity magnetic sensor (2) comprises a TMR magnetic sensor (12) and a sensor circuit board (13); the TMR magnetic sensor can detect the magnetic field changes in three directions and convert the magnetic field changes into six paths of differential voltage signals to be output, and magnetic field signals around a pipeline to be detected are obtained;
the SMA radio frequency connecting line (3) comprises two SMA-J inner screw inner needle pure copper male heads (7) and a section of RG316 radio frequency line (6);
the data line (4) comprises two J30J-37TJL rectangular connector heads (9) and a section of 30-core high-flexibility twisted-pair shielding wire (8);
the flexible detection probe shell (5) comprises an SMA female head (14), a data transmission plug (15), an organ cover (16), a PVC angle material (17), an aluminum alloy handle (18), a 0.5mm hard PVC plate (19) and a nylon binding band (20).
2. The steel pipeline harmonic magnetic field focusing detection probe for the non-dismantling insulation layer of the claim 1 is characterized in that the exciting coil array is composed of a large rectangular coil (10) and four small rectangular coils (11); and the coil joints of the exciting coil (1) are respectively connected with the wiring ends of the two SMA female heads (14) to form a coil power supply loop.
3. The steel pipeline harmonic magnetic field focusing detection probe for the non-dismantling insulation layer according to claim 1, characterized in that the TMR magnetic sensor (12) is a three-axis linear sensor, and the connection mode of the sensor circuit board (13) and the TMR magnetic sensor (12) is a direct insertion type.
4. The steel pipeline harmonic magnetic field focusing detection probe for the non-dismantling insulation layer is characterized in that a radio frequency wire (3) is used for connecting an excitation source and the detection probe and supplying power to an excitation coil (1); the data line (4) is used for connecting the data acquisition card and the detection probe and transmitting the acquired data to the acquisition card.
5. The steel pipeline harmonic magnetic field focusing detection probe for the non-dismantling insulation layer is characterized in that the flexible detection probe shell (5) adopts a hard PVC thin plate (18) and an organ cover (15) as main bodies, and a PVC angle section bar (17) as a connecting part; when the device is used, the detection probe is attached to the heat-insulating layer by adjusting the nylon fixing band (20).
6. The method for manufacturing the steel pipeline harmonic magnetic field focusing detection probe without detaching the heat insulation layer by using the detection probe as claimed in claim 1, wherein the steps of using the harmonic magnetic field focusing detection probe to detect are as follows:
(1) taking out the TMR magnetic sensor from the magnetic shielding barrel, opening the organ cover, inserting the sensor into a base on a sensor circuit board, and fixing the organ cover and the PVC angle connecting plate by using bolts and nuts;
(2) the detection probe is placed on the heat-insulating layer of the pipeline to be detected, the tightness degree of the fixing device is adjusted according to the heat-insulating layer, so that the probe is attached to the heat-insulating layer of the pipeline and can freely move along the axial direction of the pipeline;
(3) connecting an excitation source and a detection probe by using an SMA radio frequency wire, and connecting an acquisition card and the detection probe by using a data wire;
(4) opening the detection equipment, and moving the detection probe above the pipeline along the same direction at a constant speed for multiple times to finish detection;
(5) after the detection is finished, the TMR magnetic sensor is detached, and the shielding barrel is put back, so that the external environment is prevented from interfering the accuracy of the sensor, and the next detection is influenced.
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| CN202011512306.7A CN112782270A (en) | 2020-12-19 | 2020-12-19 | Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer |
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| CN202011512306.7A CN112782270A (en) | 2020-12-19 | 2020-12-19 | Manufacturing method of steel pipeline harmonic magnetic field focusing detection probe without detaching heat insulation layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4332564A1 (en) * | 2022-08-30 | 2024-03-06 | Yokogawa Electric Corporation | Magnetic pipe sensor |
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