CN114778661A - Eddy current sensor carried on pipe cleaner and pipeline defect detection method - Google Patents
Eddy current sensor carried on pipe cleaner and pipeline defect detection method Download PDFInfo
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Abstract
The invention belongs to the technical field of pipeline cleaning devices, and particularly relates to a vortex sensor carried on a pipe cleaner and a pipeline defect detection method, which are based on a vortex principle, realize a better shielding effect by introducing a composite shielding brush and can be tightly attached to a pipeline along with the deformation of the pipeline; the double detection sensor arrays can realize clock positioning of defects, and a high-frequency excitation coil is added between the double arrays to excite a high-frequency eddy current field so as to realize detection of the defects of the inner wall. The transmitting coil group forms a space low-frequency rotating magnetic field, and the magnetic field can be quickly guided into the pipeline by adding the magnetic conduction steel brush, so that the defects in the pipeline can be better identified. And this application simple structure can the various types of dredging pipe wares of adaptation, can be when the dirty while of clearance pipeline detect the defect in the pipeline, improved work efficiency greatly to the detection cost has been reduced.
Description
Technical Field
The invention belongs to the technical field of pipeline cleaning devices, and particularly relates to a vortex sensor carried on a pipe cleaner and a pipeline defect detection method.
Background
The buried steel long oil and gas transmission pipeline is a 'main artery' of national energy, the cost of the oil and gas transmission pipeline is high, the passing area is wide, the related area type is complex, and once perforation and rupture occur, serious accidents can be caused. The serious accidents caused by the damage often cause huge economic losses.
At present, two operations of pipe cleaning and in-pipeline detection are completely isolated in China, data in any pipeline are not collected in the pipe cleaning process, and the data collection in the pipeline is completely finished by the operation of in-pipeline detection. Not only causes great resource waste, but also can not obtain information in the pipeline in real time or in a short period, and has no timely and effective data support for the digital operation of the pipeline.
In recent years, part of technologies on the magnetic flux leakage detector are gradually stripped, a diameter measuring detector, a punching oil stealing detector, a central line surveying instrument and the like appear in succession, and the technical blank between the magnetic flux leakage detection and the pipe cleaning operation is made up to a certain extent, but the technologies cannot be completely seamlessly integrated on a pipe cleaner, and the use cost is still high.
Disclosure of Invention
The application provides a carry-on eddy current sensor and pipeline defect detection method on dredging pipe ware to solve cleaner and detection technology and can not combine completely, and the problem that use cost is high. A first aspect of the present invention provides an eddy current sensor mounted on a pipe pig, including: the system comprises a transmitting system, a shielding system, a receiving system and a supporting frame;
the supporting frame is of a cylindrical structure, the transmitting system, the shielding system and the receiving system are all arranged outside the supporting frame and coaxial with the supporting frame, and the transmitting system, the shielding system and the receiving system are parallel to each other;
the transmitting system is arranged at one end of the supporting frame, the receiving system is arranged at the other end of the supporting frame, and the shielding system is arranged in the middle of the supporting frame;
the transmitting system comprises a transmitting coil group and a steel brush, the steel brush is arranged outside the transmitting coil group and surrounds the transmitting coil group for a circle, and the outer diameter of the transmitting system is in interference fit with the inner diameter of the pipeline;
the shielding system comprises a shielding brush base and a shielding brush, the bottom of the shielding brush is fixedly connected with the shielding brush base, surrounds the shielding brush base for a circle and extends towards the direction far away from the shielding brush base, and the outer diameter of the shielding system is in interference fit with the inner diameter of the pipeline;
the receiving system comprises a plurality of detecting sensors and magnetic field exciting coils, wherein the detecting sensors are arranged in two parallel rows on the outer circumference of the magnetic field exciting coils.
Furthermore, the transmitting coil group comprises three coils, the coils are rectangular spiral coils, the geometric center points of the coils are on the same straight line, and the difference between the coils is 60 degrees.
Furthermore, the shielding brush is made of three materials, namely copper, steel and aluminum.
Furthermore, the shielding brush is made of two materials, namely steel and copper, or steel and aluminum.
Furthermore, the steel brush is made of magnetic materials.
In a second aspect of the present application, there is provided a method for detecting a defect in a pipeline, which is applied to the above-mentioned pig-mounted eddy current sensor, the method including:
introducing low-frequency excitation with a phase difference of 120 degrees into the transmitting system, and introducing high-frequency excitation into the magnetic field excitation coil;
the transmitting system is adopted to generate a low-frequency rotating magnetic field through low-frequency excitation, the steel brush guides the low-frequency rotating magnetic field into a pipeline, and the low-frequency rotating magnetic field feeds back a low-frequency magnetic field signal after passing through the pipeline;
generating high-frequency eddy current by adopting the magnetic field exciting coil through high-frequency excitation, wherein the high-frequency eddy current is distributed on the inner wall of the pipeline and feeds back a high-frequency magnetic field signal after passing through the inner wall of the pipeline;
shielding a direct coupling part of the low-frequency rotating magnetic field and the receiving system by using the shielding system so that the magnetic field reaches the receiving system through a pipeline;
and acquiring the low-frequency magnetic field signal and the high-frequency magnetic field signal by adopting the detection sensor, detecting the magnetic field amplitude and phase change in the low-frequency magnetic field signal and the high-frequency magnetic field signal, and judging the position of the pipeline defect.
Further, the step of judging the position of the pipeline defect comprises the following steps:
when the amplitude and the phase of the low-frequency magnetic field are detected to be changed and the amplitude and the phase of the high-frequency magnetic field are not changed, judging that the pipeline outer wall is defective; when the amplitude and phase changes of the low-frequency magnetic field and the high-frequency magnetic field are detected, judging that the defects of the inner wall of the pipeline exist;
and judging that the pipeline defect appears in the circumferential direction according to the circumferential position of the detection sensor for detecting the pipeline defect.
Further, the excitation frequency of the low frequency excitation is less than or equal to 200 Hz.
Further, the excitation frequency of the high-frequency excitation is greater than or equal to 1 kHz.
Further, the calculation formula generated by the low-frequency rotating magnetic field is as follows:
the low-frequency excitation phase difference is 120 degrees under the following voltage introduced into the transmitting system;
the three-phase voltage is obtained by calculation according to the following formula:
in the formula: u. uA、uB、uCThe voltages at two ends of the three coils are respectively, and U is an introduced voltage;
the three-phase current is obtained by calculation according to the following formula:
in the formula: i all right angleA、iB、iCThe currents in the three coils are respectively, and I is the introduced current;
the magnetomotive force generated by the three-phase winding is calculated and obtained according to the following formula:
in the formula: f. ofA（x，t）、fB（x，t）、fCThe (x, t) is magnetomotive force generated by the three coil (111) windings respectively, and the f (x, t) is magnetomotive force generated by the three-phase windings;
and obtaining a low-frequency rotating magnetic field formed in the space after the transmitting system is introduced with low-frequency excitation according to the formula.
According to the technical scheme, the vortex sensor suitable for the pipe cleaner and the method for detecting the pipeline defects are designed, and the pipeline defects can be identified in the operation process of the pipe cleaner. The close fit of the sensor and the pipe wall can quickly guide the magnetic field into the pipeline, so that the scheme introduces the copper-steel-aluminum composite brush group for shielding, and adds the steel brush outside the transmitting coil; the single coil transmits a magnetic field which is a pulse vibration magnetic field, and the scheme introduces a three-coil scheme to generate a low-frequency rotating magnetic field in space, wherein the low-frequency rotating magnetic field is more sensitive to crack defects; a high-frequency excitation coil is added between the detection arrays, and eddy currents generated by the high-frequency excitation coil concentrate on the inner wall of the pipeline, so that the defects of the inner wall can be identified. The integral sensor combination can distinguish the defects of the inner wall and the outer wall. This application simple structure can the various types of dredging pipe wares of adaptation, can be when the dirty while of clearance pipeline detect the defect in the pipeline, improved work efficiency greatly to the detection cost has been reduced.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the invention, it is to be understood that the drawings, which are included in the following description, are merely exemplary embodiments of the invention and that other drawings, which will be apparent to those skilled in the art, may be devised in accordance with the drawings without undue experimentation.
FIG. 1 is a schematic diagram of the overall structure of an eddy current sensor suitable for a pig according to the present application;
fig. 2 is a schematic diagram of a transmitting system in the present application;
FIG. 3 is a schematic diagram of the shielding system of the present application;
fig. 4 is a schematic structural diagram of a receiving system in the present application;
FIG. 5 is a schematic flow chart of the pipeline defect detection method of the present application;
FIG. 6 is a schematic view of a sub-process for determining a defect position of a pipeline according to the pipeline defect detection method of the present application;
in the figure, 1-transmitting system, 2-shielding system, 3-receiving system, 4-supporting frame, 11-transmitting coil group, 12-steel brush, 21-shielding brush base, 22-shielding brush, 31-detection sensor, 32-magnetic field excitation coil and 111-coil.
Detailed Description
In the prior art, the existing technologies such as a diameter measuring detector, a punching oil stealing detector, a central line mapping instrument and the like cannot be completely seamlessly integrated on a pipe cleaner, and the pipe cleaner is single in function and complex in structure. In order to solve the above problems, an object of the present application is to provide a vortex sensor and a method for detecting a pipe defect carried on a pipe cleaner, which can identify the pipe defect while performing a pipe cleaning operation.
In a first aspect of the present application, there is provided a pig-mounted eddy current sensor, as shown in fig. 1, comprising: a transmitting system 1, a shielding system 2, a receiving system 3 and a support frame 4.
The support frame 4 is a cylindrical structure, the transmitting system 1, the shielding system 2 and the receiving system 3 are all arranged outside the support frame 4 and are coaxial with the support frame 4, and the transmitting system 1, the shielding system 2 and the receiving system 3 are parallel to each other.
In this application embodiment, support frame 4 designs for the cylinder structure, can be according to the pig that uses in the reality, corresponding regulation the diameter of support frame 4, support frame 4 can be for complete hollow structural state, and direct cover also can be for being connected at the front end or the rear end of foam pig for the entity structure by the packing, this application support frame 4 is applicable to various types of pig and carries on.
The transmitting system 1 is arranged at one end of the support frame 4, the receiving system 3 is arranged at the other end of the support frame 4, and the shielding system 2 is arranged in the middle of the support frame 4.
In the embodiment of the application, the positions of the transmitting system 1, the shielding system 2 and the receiving system 3 can be exchanged, so that the actual use and detection effects are not influenced; the emission system 1, the shielding system 2 and the receiving system 3 are coaxial with the support frame 4, so that the fitting degree between the components and the pipeline can be ensured.
As shown in fig. 2, the transmitting system 1 includes a transmitting coil set 11 and a steel brush 12, the steel brush 12 is disposed outside the transmitting coil set 11 and surrounds the transmitting coil set 11 for a circle, and the outer diameter of the transmitting system 1 is in interference fit with the inner diameter of the pipeline.
Further, in this embodiment, the steel brush 12 is made of a magnetic conductive material.
In the embodiment of this application, transmitting coil group 11 is in be arranged in generating low frequency rotating magnetic field in transmitting system 1, steel brush 12 is arranged in the quick leading-in pipeline of magnetic field that will produce, and the magnetic field of coil transmission among the prior art only leans on the air coupling to the pipeline in, this scheme is in the transmitting coil group 11 outside increases the magnetic conduction steel brush 12, can improve the coupling degree, with the magnetic field that transmitting coil group 11 produced is leading-in to the pipeline in to reach the detection mesh to small defect.
In the use, can let in the low frequency excitation in the transmitting coil group 11, produce low frequency magnetic field, because the external diameter and the pipeline internal diameter interference fit of transmitting system 1, so steel brush 12 and the laminating of pipeline inner wall firmly make the effectual distribution of low frequency magnetic field can influence the power and the distribution in magnetic field when having surface defect in the pipeline, consequently through right the change in low frequency magnetic field is monitored, just can know the existence of defect in the pipeline.
Further, in this embodiment, the transmitting coil set 11 includes three coils 111, geometric center points of the three coils are on the same straight line, the coils are rectangular spiral coils, and a difference between the three coils is 60 °. In the prior art, two coils generally generate a spatial low-frequency rotating magnetic field, and compared with three coils, the two coils are uneven in magnetic field. In addition, in the present application, the number of the coils 111 may be a multiple of 3, and when the number of the coils 111 is large, a better magnetic field distribution effect may be achieved.
As shown in fig. 3, the shielding system 2 includes a shielding brush base 21 and a shielding brush 22, the bottom of the shielding brush 22 is fixedly connected to the shielding brush base 21, surrounds the shielding brush base 21 for a circle, and extends in a direction away from the shielding brush base 21, and the outer diameter of the shielding system 2 is in interference fit with the inner diameter of the pipeline.
Further, in the present embodiment, the shielding brush 22 is made of three materials, i.e., copper, steel and aluminum.
Further, in this embodiment, the shielding brush 22 is made of two materials, i.e., steel and copper, or two materials, i.e., steel and aluminum.
In the embodiments of the present application, it should be understood that, in general, when shielding low frequencies, a shielding cover made of a material with high magnetic permeability is used, so that a better shielding effect is obtained. In this application, adopt foil to pile up promptly and make shielding brush 22, because steel has comparatively good magnetic permeability, copper and aluminium have better electric conductivity, and these three kinds of material cooperation preparation shielding brush 22 has better shielding effect to the material is simple easily obtained, and the low price acquires easily and replaces, has reduced the detection cost.
In addition, the current eddy current shielding technology generally adopts a shielding disc made of hard materials for shielding, the shielding disc has no deformation, when a pipeline deforms, a sensor is easily clamped in the pipeline, and in the embodiment of the application, an aluminum-steel-copper composite shielding brush is adopted, because the outer diameter of the shielding system 2 is in interference fit with the inner diameter of the pipeline. Therefore, the shielding brush 22 can be tightly attached to the pipeline, the close attachment means that the shielding effect is good, and on the other hand, the deformation of the shielding brush 22 is large, so that the situation that the pipeline cleaner is blocked in the pipeline cannot be caused.
As shown in fig. 4, the receiving system 3 includes a plurality of detection sensors 31 and magnetic field excitation coils 32, and the detection sensors 31 are arranged in two rows arranged in parallel on the outer circumference of the magnetic field excitation coils 32.
The detection sensors 31 in the receiving system 3 may be arranged in more than two rows of circles, and the array of detection sensors 31 can realize clock localization of defects. When the magnetic field excitation coil 32 is energized with high-frequency excitation in use, the generated high-frequency eddy current is distributed on the inner wall of the pipeline. The detection sensor 31 can detect the low-frequency magnetic field signal changes of the defects under the transmitting coil assembly 11, and can also detect the high-frequency magnetic field signal changes under the magnetic field excitation coil 32. The high-frequency magnetic field signal identifies the defects of the inner wall of the pipeline, and the low-frequency magnetic field signal identifies the defects of the inner wall and the outer wall. The sensor is therefore able to distinguish between internal and external wall defects.
In a second aspect of the present application, a method for detecting a pipeline defect is provided, as shown in fig. 5, and is applied to a pig-mounted eddy current sensor in the above embodiments; the method comprises the following steps:
step S100: the low-frequency excitation with a phase difference of 120 ° is passed into the transmission system 1, and the magnetic field excitation coil 32 is passed into the high-frequency excitation.
Further, in this implementation, the excitation frequency of the low frequency excitation is less than or equal to 200 Hz.
Further, in this implementation, the excitation frequency of the high frequency excitation is greater than or equal to 1 kHz.
In the embodiment of the application, the transmitting coil assembly 11 generates a low-frequency rotating magnetic field after being introduced with the low-frequency excitation, and the low-frequency rotating magnetic field is more sensitive to crack defects and can detect cracks and damages in a pipeline; the magnetic field excitation coil 32 generates high-frequency eddy current after being introduced into the high-frequency excitation, and the high-frequency eddy current is concentrated on the inner wall of the pipeline, so that the defects of the inner wall of the pipeline can be identified.
Further, in this embodiment, the calculation formula generated by the low-frequency rotating magnetic field is as follows:
the voltages introduced into the transmission system (1) are such that the phase difference of the introduced low-frequency excitation is 120 °.
The three-phase voltage is obtained by calculation according to the following formula:
in the formula: u. ofA、uB、uCThe voltages at two ends of the three coils (111) are respectively, and U is an introduced voltage;
the three-phase current is obtained by calculation according to the following formula:
in the formula: i all right angleA、iB、iCCurrents in the three coils (111) are respectively, and I is an introduced current;
the magnetomotive force generated by the three-phase winding is calculated and obtained according to the following formula:
in the formula: f. ofA（x，t）、fB（x，t）、fCAnd (x, t) are magnetomotive forces generated by the three coil (111) windings respectively, and f (x, t) is a magnetomotive force generated by the three-phase winding. And obtaining a low-frequency rotating magnetic field formed in the space after the low-frequency excitation is introduced into the transmitting system (1) according to the formula.
Taking the above calculation result as an example, when the detection sensor detects a low-frequency magnetic field signal, that is, according to the amplitude and the phase in the magnetomotive force of the low-frequency magnetic field in the above calculation formula, it is determined whether the amplitude and the phase of the low-frequency magnetic field have changed.
In this embodiment, the aforementioned calculation of the low-frequency rotating magnetic field is performed by using three windings of the coil (111), an included angle of each of the coils (111) is calculated as 120 °, when the number of the coils (111) is more, the included angle is divided by a multiple of the increase of the number, parameters in a corresponding modification equation are calculated, and then an amplitude and a phase of each winding of the low-frequency rotating magnetic field are obtained, so that defect detection can be performed.
Step S200: the transmitting system 1 is adopted to generate a low-frequency rotating magnetic field through low-frequency excitation, the steel brush 12 guides the low-frequency rotating magnetic field into a pipeline, and the low-frequency rotating magnetic field feeds back a low-frequency magnetic field signal after passing through the pipeline.
Step S300: the magnetic field exciting coil 32 is adopted to generate high-frequency eddy current through high-frequency excitation, the high-frequency eddy current is distributed on the inner wall of the pipeline, and the high-frequency eddy current passes through the inner wall of the pipeline and then is fed back to a high-frequency magnetic field signal.
Step S400: and shielding the direct coupling part of the low-frequency rotating magnetic field and the receiving system 3 by using the shielding system 2 so that the magnetic field reaches the receiving system 3 through a pipeline.
In this embodiment, the shielding system 2 is configured to shield a direct coupling portion of the low-frequency rotating magnetic field with the receiving system 3, so that the low-frequency rotating magnetic field reaches the receiving system 3 through a pipe wall, and the pipe wall defect condition can be reflected better.
Step S500: and acquiring the low-frequency magnetic field signal and the high-frequency magnetic field signal by using the detection sensor 31, detecting the magnetic field amplitude and phase change in the low-frequency magnetic field signal and the high-frequency magnetic field signal, and judging the position of the pipeline defect.
In the embodiment of the present application, the type of the detection sensor 31 is not limited, and the detection sensor may have a function of detecting an electromagnetic signal, such as a wireless sensor, an electromagnetic sensor, and the like.
Further, as shown in fig. 6, in this embodiment, the step of determining the defect position of the pipeline includes:
step S510: when the amplitude and the phase of the low-frequency magnetic field are detected to be changed and the amplitude and the phase of the high-frequency magnetic field are not changed, judging that the pipeline outer wall is defective; and when the amplitude and phase changes of the low-frequency magnetic field and the high-frequency magnetic field are detected, judging that the inner wall of the pipeline is defective.
In the embodiment, the low-frequency rotating magnetic field detects defects in the pipeline, and the high-frequency eddy current is concentrated on the inner wall of the pipeline to identify the defects on the inner wall of the pipeline; when the inner wall of the pipeline has defects, the low-frequency rotating magnetic field and the high-frequency eddy current pass through the defect positions, so that the amplitude and the phase of the low-frequency rotating magnetic field and the high-frequency eddy current are changed; when the outer wall of the pipeline has defects, only the low-frequency rotating magnetic field distributed in the pipeline passes through the defect position, and the high-frequency eddy current is only distributed on the inner wall of the pipeline and is not influenced by the defects on the outer wall of the pipeline, so that only the amplitude and the phase of the low-frequency rotating magnetic field can change, and the defect in the pipeline on the inner wall or the outer wall can be distinguished in the mode.
Step S520: and judging that the pipeline defect appears in the circumferential direction according to the circumferential position of the detection sensor 31 for detecting the pipeline defect.
In the present embodiment, the detection sensor 31 is provided in plural, and two rows are arranged in parallel circumferentially outside the magnetic field excitation coil 32. Due to the adoption of the circumferential arrangement, the indication position of the clock can be contrasted, the amplitude and the phase of the magnetic field detected by the detection sensor 31 at which position are changed, namely, the position of the pipeline where the defect occurs can be determined, and by combining the method for determining the inner wall and the outer wall of the pipeline in the previous step, the defect position can be accurately judged, and then the subsequent repair work is carried out.
According to the embodiment, the composite shielding brush is introduced based on the eddy current principle, so that a better shielding effect is realized, and the composite shielding brush can be tightly attached to a pipeline along with the deformation of the pipeline; the double detection sensor arrays can realize clock positioning of defects, the high-frequency excitation coil is added between the double arrays, a high-frequency eddy current field can be excited, a space low-frequency rotating magnetic field is formed for the detection transmitting coil group with the inner wall defects, the magnetic field can be quickly guided into the pipeline by adding the magnetic conduction steel brush, and the defects in the pipeline can be better identified. And this application simple structure can the various types of cleaners of adaptation, can be when the clearance pipeline is dirty detect the defect in the pipeline, has improved work efficiency greatly to detection cost has been reduced.
Claims (10)
1. A pig-mounted eddy current sensor, characterized in that it comprises: the device comprises a transmitting system (1), a shielding system (2), a receiving system (3) and a support frame (4);
the supporting frame (4) is of a cylindrical structure, the transmitting system (1), the shielding system (2) and the receiving system (3) are arranged outside the supporting frame (4) and are coaxial with the supporting frame (4), and the transmitting system (1), the shielding system (2) and the receiving system (3) are parallel to each other;
the transmitting system (1) is arranged at one end of the support frame (4), the receiving system (3) is arranged at the other end of the support frame (4), and the shielding system (2) is arranged in the middle of the support frame (4);
the transmitting system (1) comprises a transmitting coil group (11) and a steel brush (12), wherein the steel brush (12) is arranged on the outer side of the transmitting coil group (11) and surrounds the transmitting coil group (11) for a circle, and the outer diameter of the transmitting system (1) is in interference fit with the inner diameter of a pipeline;
the shielding system (2) comprises a shielding brush base (21) and a shielding brush (22), the bottom of the shielding brush (22) is fixedly connected with the shielding brush base (21), surrounds the shielding brush base (21) for a circle and extends towards the direction far away from the shielding brush base (21), and the outer diameter of the shielding system (2) is in interference fit with the inner diameter of a pipeline;
the receiving system (3) comprises a plurality of detecting sensors (31) and magnetic field exciting coils (32), wherein the detecting sensors (31) are arranged in two parallel rows on the outer circumference of the magnetic field exciting coils (32).
2. The pig-mounted eddy current sensor according to claim 1, characterized in that the transmitting coil set (11) comprises three coils (111), the coils (111) are rectangular spiral coils, the geometric center points of the three coils (111) are on the same straight line, and the difference between the three coils (111) is 60 degrees.
3. The pig-mounted eddy current sensor according to claim 1, characterized in that the shielding brushes (22) are made of three materials, copper, steel and aluminum.
4. The pig-mounted eddy current sensor according to claim 1, characterized in that the shielding brush (22) is made of two materials, steel and copper, or steel and aluminum.
5. The pig-mounted eddy current sensor according to claim 1, characterized in that the steel brush (12) is made of magnetically conductive material.
6. A method for detecting a defect in a pipeline, which is applied to the eddy current sensor mounted on the pig as claimed in any one of claims 1 to 5; the method comprises the following steps:
low-frequency excitation with a phase difference of 120 degrees is conducted into the transmitting system (1), and high-frequency excitation is conducted into the magnetic field excitation coil (32);
the transmitting system (1) is adopted to generate a low-frequency rotating magnetic field through low-frequency excitation, the steel brush (12) guides the low-frequency rotating magnetic field into a pipeline, and the low-frequency rotating magnetic field feeds back a low-frequency magnetic field signal after passing through the pipeline;
the magnetic field exciting coil (32) is adopted to generate high-frequency eddy current through high-frequency excitation, the high-frequency eddy current is distributed on the inner wall of the pipeline, and the high-frequency eddy current passes through the inner wall of the pipeline and then is fed back to a high-frequency magnetic field signal;
shielding the direct coupling part of the low-frequency rotating magnetic field and the receiving system (3) by using the shielding system (2) so that the magnetic field reaches the receiving system (3) through a pipeline;
and acquiring the low-frequency magnetic field signal and the high-frequency magnetic field signal by adopting the detection sensor (31), detecting the magnetic field amplitude and phase change in the low-frequency magnetic field signal and the high-frequency magnetic field signal, and judging the position of the pipeline defect.
7. The method as claimed in claim 6, wherein the step of determining the location of the pipe defect comprises:
when the amplitude and the phase of the low-frequency magnetic field are detected to be changed and the amplitude and the phase of the high-frequency magnetic field are not changed, judging that the pipeline outer wall is defective; when the amplitude and phase changes of the low-frequency magnetic field and the high-frequency magnetic field are detected, judging that the inner wall of the pipeline is defective;
and judging that the pipeline defect appears in the circumferential direction according to the circumferential position of the detection sensor (31) for detecting the pipeline defect.
8. The method of claim 6, wherein the excitation frequency of the low frequency excitation is less than or equal to 200 Hz.
9. The method of claim 6, wherein the excitation frequency of the high frequency excitation is greater than or equal to 1 kHz.
10. The method of claim 6, wherein the low frequency rotating magnetic field generates a calculation formula as follows:
the voltage introduced into the transmitting system (1) is as follows, and the introduced low-frequency excitation phase difference is 120 degrees;
the three-phase voltage is obtained by calculation according to the following formula:
in the formula: u. uA、uB、uCThe voltages at two ends of the three coils (111) are respectively, and U is an input voltage;
the three-phase current is obtained by calculation according to the following formula:
in the formula: i.e. iA、iB、iCCurrents in the three coils (111) are respectively, and I is an introduced current;
the magnetomotive force generated by the three-phase winding is calculated and obtained according to the following formula:
in the formula: f. ofA（x，t）、fB（x，t）、fCThe (x, t) is magnetomotive force generated by the three coil (111) windings respectively, and the f (x, t) is magnetomotive force generated by the three-phase windings;
and obtaining a low-frequency rotating magnetic field formed in the space after the low-frequency excitation is introduced into the transmitting system (1) according to the formula.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210707662.7A CN114778661B (en) | 2022-06-22 | 2022-06-22 | Eddy current sensor carried on pipe cleaner and pipeline defect detection method |
| PCT/CN2022/132073 WO2023245969A1 (en) | 2022-06-22 | 2022-11-15 | Eddy current sensor carried on pipeline cleaner, and pipeline defect detection method |
| GB2307231.7A GB2615917B (en) | 2022-06-22 | 2022-11-15 | Eddy current sensor carried on pipeline cleaner and pipeline defect detection method |
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| CN202210707662.7A CN114778661B (en) | 2022-06-22 | 2022-06-22 | Eddy current sensor carried on pipe cleaner and pipeline defect detection method |
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| CN114778661B CN114778661B (en) | 2023-03-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115338202A (en) * | 2022-10-17 | 2022-11-15 | 国机传感科技有限公司 | Flexible pipe cleaner with diameter measuring function |
| GB2615917A (en) * | 2022-06-22 | 2023-08-23 | Sinomach Sensing Tech Co Ltd | Eddy current sensor carried on pipeline cleaner and pipeline defect detection method |
| WO2023245969A1 (en) * | 2022-06-22 | 2023-12-28 | 国机传感科技有限公司 | Eddy current sensor carried on pipeline cleaner, and pipeline defect detection method |
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Also Published As
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| CN114778661B (en) | 2023-03-21 |
| WO2023245969A1 (en) | 2023-12-28 |
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