Pipeline non-contact magnetic flux leakage internal detection device

Abstract

The invention discloses a non-contact magnetic flux leakage internal detection device for a pipeline, and belongs to the technical field of pipeline detection. The device comprises a driving module, a universal connection module and a magnetic flux leakage detection module which are connected in sequence. An excitation unit of the magnetic flux leakage detection module is provided with a magnetization mechanism and a magnetic field signal acquisition mechanism, and the outer diameter enclosed by a magnetization assembly is smaller than the outer diameter of a supporting disc, so that non-contact excitation is realized. According to the non-contact magnetic flux leakage internal detection device for the pipeline, direct friction between an excitation structure and the inner wall of the pipeline is fundamentally avoided, damage to an inner wall coating or a body is effectively prevented, and the requirement for the smoothness of the inner wall of the pipeline is greatly reduced; the adaptability, passing ability and operation stability of the device to complex working conditions such as scaling and corrosion are improved, the signal quality is guaranteed through the self-adaptive attached signal collector, it is guaranteed that the device smoothly passes through a bent pipe section through the universal connecting module, and safe, stable and high-integrity detection within the wide pipeline diameter range is achieved on the whole.

Description

A non-contact magnetic flux leakage internal detection device for pipelines Technical Field

[0001] This invention relates to the field of pipeline inspection, and more particularly to a non-contact magnetic flux leakage internal inspection device for pipelines. Background Technology

[0002] In many industrial sectors such as petroleum, natural gas, and chemicals, pipelines are crucial facilities for transporting fluid media, and their safe and stable operation is of paramount importance. As pipelines age, they inevitably develop various defects, such as cracks, corrosion pits, and wall thinning, due to factors such as internal media corrosion, external environmental erosion, and mechanical stress.

[0003] Magnetic flux leakage detection technology is based on the magnetic properties of ferromagnetic materials. When an external magnetic field is applied to a ferromagnetic pipe for magnetization, if the inner wall of the pipe is intact, the magnetic lines of force will be confined inside the pipe, with almost no leakage to the outside. However, when there are defects in the inner wall of the pipe, the permeability at the defect location changes, causing distortion of the magnetic lines of force. Some of these lines of force will leak to the outside of the pipe, forming a magnetic flux leakage field. By placing magnetic sensors at appropriate locations outside or inside the pipe to detect the intensity and distribution of the magnetic flux leakage field, information such as the location, size, and shape of defects in the inner wall of the pipe can be inferred.

[0004] In traditional contact-type pipeline magnetic flux leakage (MFLC) internal detection devices, the excitation structure of the detection equipment is in direct contact with the inner wall of the pipeline. However, this contact design has some shortcomings in practical applications. On the one hand, due to the long-term frictional contact between the excitation structure of the detection device and the inner wall of the pipeline, the inner wall of the pipeline is easily worn, especially for some pipelines with thin coatings or soft materials. This wear may affect the normal use and lifespan of the pipeline. On the other hand, the contact design requires a high degree of smoothness of the inner wall of the pipeline. When there are large protrusions, scale, or foreign objects on the inner wall of the pipeline, the detection device may be obstructed and unable to pass through normally, or even cause equipment damage, affecting the smooth progress of the detection work.

[0005] To address this issue, a non-contact magnetic flux leakage internal detection device for pipelines is provided. Summary of the Invention

[0006] This invention provides a non-contact magnetic flux leakage internal detection device for pipelines, which aims to solve the problems of traditional contact-type magnetic flux leakage internal detection devices for pipelines, which are prone to pipeline wear due to direct contact with the inner wall of the pipeline and cannot adapt to complex working conditions such as protrusions and scaling on the inner wall.

[0007] A non-contact magnetic flux leakage (MF) detection device for pipelines includes: a drive module located at the head end, a MF leakage detection module located at the tail end, and a universal joint connecting the drive module and the MF leakage detection module. The MF leakage detection module includes: a rear traction seat connected to the universal joint connecting module; a front fixed seat connected to the rear traction seat, with a third support disc disposed between the front fixed seat and the rear traction seat; and an excitation unit located at the end of the front fixed seat away from the rear traction seat, comprising a base column and magnetizing elements located at both ends of the base column. The system includes a magnetization mechanism and a magnetic field signal acquisition mechanism located in the middle of the base column. The magnetization mechanism includes magnetization components arranged at equal angles around the circumference of the base column, and the magnetic field signal acquisition mechanism includes a plurality of signal acquisition components arranged at equal angles around the base column. A rear fixing seat is located at one end of the excitation unit away from the front fixing seat. A tail seat is connected to the rear fixing seat, and the fourth support disc is arranged between the rear fixing seat and the tail seat. The outer diameter formed by the magnetization components is smaller than the outer diameters of the third support disc and the fourth support disc.

[0008] As a further description of the above technical solution: the signal acquisition component includes: an acquisition fixing base, which is fixedly disposed on the side of the magnetization component near the universal connection module; a spring seat, which is hinged to the acquisition fixing base by means of a pin; a spring, which is disposed on the pin to keep the spring seat open from the acquisition fixing base; and a signal acquisition device, which is bolted to the end of the spring seat away from the spring seat.

[0009] As a further description of the above technical solution: the magnetization component is a steel brush magnetization component or a steel brushless magnetization component; the steel brush magnetization component includes a magnet connected to the base column, a fixing cover disposed on the outside of the magnet, and a steel brush disposed on the outside of the fixing cover; the steel brushless magnetization component includes a magnet connected to the base column and a fixing cover disposed on the outside of the magnet.

[0010] As a further description of the above technical solution: the drive module includes: a front traction seat connected to the universal joint module; an electronic cabin connected to the front traction seat, with a second support disc disposed between the electronic cabin and the front traction seat; a first drive cup disposed between the front traction seat and the electronic cabin, the bottom surface of the first drive cup abutting against the second support disc, and the opening of the first drive cup facing the universal joint module; a top seat connected to the electronic cabin, with the first support disc disposed between the top seat and the electronic cabin; a second drive cup disposed between the top seat and the electronic cabin, the bottom surface of the second drive cup abutting against the first support disc, and the opening of the second drive cup facing the first drive cup; and a mileage wheel disposed at one end of the electronic cabin near the second drive cup, the mileage wheel being used to provide spatial coordinates for detection data, achieving precise mileage positioning of defects.

[0011] As a further description of the above technical solution: the universal joint module includes: a first section, one end of which is hinged to the front traction seat via a first hinge shaft; a middle section, one end of which is hinged to the first section away from the front traction seat via a second hinge shaft, the second hinge shaft being perpendicular to the first hinge shaft; the middle section having a threaded hole along its length; and a tail section, one end of which is hinged to the middle section via a third hinge shaft, the other end of which is hinged to the rear traction seat via a fourth hinge shaft; the third hinge shaft being parallel to the second hinge shaft, and the third hinge shaft being perpendicular to the fourth hinge shaft.

[0012] As a further description of the above technical solution: the first support disc, the second support disc, the third support disc and the fourth support disc have the same structure, each consisting of a disc support base and a plurality of support wheels circumferentially arranged on the outer edge of the disc support base.

[0013] The present invention has the following beneficial effects: Compared with the prior art, the non-contact magnetic flux leakage internal detection device for pipelines of the present invention, by adopting a non-contact excitation design, fundamentally eliminates the direct friction between the excitation structure of the detection device and the inner wall of the pipeline, effectively avoiding scratches, wear, or coating damage to the inner wall of the pipeline caused by the detection operation itself. It is especially suitable for pipelines with special requirements for smoothness or coating, ensuring the structural integrity and service life of the pipeline; furthermore, the non-contact design of the non-contact magnetic flux leakage internal detection device for pipelines of the present invention significantly reduces the dependence on the smoothness of the inner wall of the pipeline, enabling the detection device to smoothly pass through pipe sections with slight scaling, corrosion products, or geometric irregularities, effectively preventing equipment damage or detection interruption caused by jamming or scratching, thereby ensuring the continuity and data integrity of long-distance, large-scale detection operations; furthermore, the non-contact design of the pipeline of the present invention... The contact-type magnetic flux leakage (MF) internal detection device provides stable support for the device within the pipeline by setting support discs at both ends of the drive module and the MF detection module. Each support disc includes a disc support base and circumferential support wheels, ensuring smooth operation of the device within the pipeline, reducing shaking and offset, and improving the accuracy and stability of the detection. Furthermore, in the non-contact MF internal detection device of the present invention, the spring keeps the rebound seat open from the acquisition fixing seat, allowing the signal acquisition device to better fit against the inner wall of the pipeline, ensuring accurate and clear acquisition of MF signals, improving signal acquisition quality, and making it applicable to pipelines within a certain diameter range. Furthermore, the non-contact MF internal detection device of the present invention provides two options: a steel brush magnetization component and a brushless magnetization component. These can be flexibly selected according to different pipeline materials, detection requirements, and environmental conditions, increasing the applicability and flexibility of the device and meeting diverse detection scenarios.

[0014] Furthermore, the universal connection module in the non-contact magnetic flux leakage internal detection device for pipelines has multi-directional flexibility, which can adapt to the bending and deformation of pipelines, ensuring that the device can smoothly pass through bends and other parts in complex pipeline environments, improving the device's passability and adaptability, and ensuring that the detection work covers the entire pipeline. A wire hole is set in the middle section to facilitate the layout and connection of the internal wiring of the device, protect the wiring from damage, and ensure stable and reliable signal transmission and power supply between the modules of the device. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall structure of the brushless magnetization assembly of the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 2 is a schematic diagram of the overall structure of the brush magnetization assembly of the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 3 is a schematic diagram of the structure of the supporting disc in the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 4 is a schematic diagram of the cross-sectional structure of the magnetic flux leakage detection module in the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 5 is a schematic diagram of the structure of the universal joint module in the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 6 is a schematic diagram of the structure of the drive module in the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; Figure 7 is a schematic diagram of the structure of the signal acquisition sub-assembly in the non-contact magnetic flux leakage internal detection device for pipelines according to the present invention; In the figures: 1-drive module; 2-magnetic flux leakage detection module; 3-universal joint module; 41-first supporting disc; 42-second supporting disc. 43-Third support disc; 44-Fourth support disc; 411-Disc support base; 412-Support wheel; 21-Rear traction seat; 22-Front fixed seat; 231-Base column; 232a-Steel brush magnetization sub-assembly; 232b-Brushless magnetization sub-assembly; 232a1-Magnet; 232a2-Fixing cover; 232a3-Steel brush; 241-Signal acquisition assembly; 2411-Acquisition fixed seat; 2412-Rebound seat; 2413-Pin shaft; 2 414-Spring; 2415-Signal collector; 2416-Bolt; 25-Rear mounting seat; 26-Tail mount; 11-Front traction mount; 12-Electronic cabin; 13-First drive cup; 14-Top mount; 15-Second drive cup; 31-First section; 32-First hinge shaft; 33-Intermediate section; 34-Second hinge shaft; 35-Wire hole; 36-Tail section; 37-Third hinge shaft; 38-Fourth hinge shaft; 51-Mileage wheel. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] As shown in Figures 1 and 2, a non-contact magnetic flux leakage detection device for pipelines includes: a drive module 1 disposed at the first end, a magnetic flux leakage detection module 2 disposed at the second end, and a universal joint module 3 connecting the drive module 1 and the magnetic flux leakage detection module 2; as shown in Figures 1, 2, 4, and 7, the magnetic flux leakage detection module includes: a rear traction seat 21 connected to the universal joint module; a front fixed seat 22 connected to the rear traction seat 21, with a third support disc 43 disposed between the front fixed seat 22 and the rear traction seat 21; and an excitation unit disposed at the end of the front fixed seat 22 away from the rear traction seat 21, comprising a base column 231 and a third support disc 43 disposed at the rear fixed seat 22. The base column 231 includes magnetization mechanisms at both ends and a magnetic field signal acquisition mechanism located in the middle of the base column 231. The magnetization mechanism includes magnetization components arranged at equal angles around the circumference of the base column 231, and the magnetic field signal acquisition mechanism includes several signal acquisition components arranged at equal angles around the base column 231. A rear fixing seat 25 is located at the end of the excitation unit away from the front fixing seat 22. A tail seat 26 is connected to the rear fixing seat 25, and the fourth support disc 44 is arranged between the rear fixing seat 25 and the tail seat 26. The outer diameter formed by the magnetization components is smaller than the outer diameters of the third support disc 43 and the fourth support disc 44.

[0018] As a further description of the above technical solution: the signal acquisition component includes: an acquisition fixing base 2411, which is fixedly disposed on the side of the magnetization component near the universal connection module; a spring seat 2412, which is hinged to the acquisition fixing base 2411 by means of a pin 2414; a spring 2415, which is disposed on the pin 2414 to keep the spring seat 2412 open from the acquisition fixing base 2411; and a signal acquisition device 2415, which is connected to the end of the spring seat 2412 away from the spring seat 2412 by means of a bolt 2416.

[0019] As a further description of the above technical solution: the magnetization component is a steel brush magnetization component or a steel brushless magnetization component; the steel brush magnetization component includes a magnet 232a1 connected to the base post 231, a fixing cover 232a2 disposed on the outside of the magnet 232a1, and a steel brush 232a3 disposed on the outside of the fixing cover 232a2; the steel brushless magnetization component includes a magnet connected to the base post 231 and a fixing cover disposed on the outside of the magnet.

[0020] As a further description of the above technical solution: As shown in Figures 1, 2, and 6, the drive module includes: a front traction seat 11, which is connected to the universal joint module; an electronic cabin 12, which is connected to the front traction seat 11, with a second support disc 42 disposed between the electronic cabin 12 and the front traction seat 11; a first drive cup 13, which is disposed between the front traction seat 11 and the electronic cabin 12, with the bottom surface of the first drive cup 13 abutting against the second support disc 42, and the opening of the first drive cup 13 facing the universal joint module; and a top seat 14. It is connected to the electronic cabin 12, and the first support disc 41 is provided between the top seat 14 and the electronic cabin 12; the second drive cup 15 is provided between the top seat 14 and the electronic cabin 12, the bottom surface of the second drive cup 15 abuts against the first support disc 41, and the opening of the second drive cup 15 faces the first drive cup 13; the odometer wheel 51 is provided at one end of the electronic cabin 12 near the second drive cup 15, and the odometer wheel 51 is used to provide spatial position coordinates for detection data to achieve accurate odometer positioning of defects.

[0021] As a further description of the above technical solution: As shown in Figures 1, 2, and 5, the universal joint module includes: a first section 31, one end of which is hinged to the front traction seat 11 via a first hinge shaft 32; a middle section 33, one end of which is hinged to the first section 31 away from the front traction seat 11 via a second hinge shaft 34, the second hinge shaft 34 being perpendicular to the first hinge shaft 32; the middle section 33 is provided with a threading hole 35 along its length; and a tail section 36, one end of which is hinged to the middle section 33 via a third hinge shaft 37, the other end of which is hinged to the rear traction seat 21 via a fourth hinge shaft 38; the third hinge shaft 37 is parallel to the second hinge shaft 34, and the third hinge shaft 37 is perpendicular to the fourth hinge shaft 38.

[0022] As a further description of the above technical solution: As shown in Figures 1, 2 and 3, the first support disc 41, the second support disc 42, the third support disc 43 and the fourth support disc 44 have the same structure, each consisting of a disc support base 411 and a plurality of support wheels 412 circumferentially arranged on the outer edge of the disc support base 411.

[0023] The non-contact magnetic flux leakage internal detection device for pipelines described in this invention fundamentally avoids direct friction with the inner wall of the pipeline through a non-contact excitation design. This effectively prevents damage to the inner wall coating or the device itself, significantly reduces the requirements for the smoothness of the inner wall of the pipeline, and improves the device's adaptability and throughput under complex working conditions such as scaling and corrosion. Meanwhile, the support disc structure at both ends of the device ensures stable operation, the adaptively fitting signal acquisition unit guarantees signal quality, the optional magnetization component enhances application flexibility, and the universal connection module ensures smooth passage through curved pipe sections. Overall, it achieves safe, stable, and high integrity detection across a wide range of pipeline diameters.

[0024] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-contact magnetic flux leakage internal detection device for pipelines, comprising: The system comprises a drive module (1) at the front end, a magnetic flux leakage detection module (2) at the rear end, and a universal joint module (3) connecting the drive module (1) and the magnetic flux leakage detection module (2); characterized in that the magnetic flux leakage detection module includes: a rear traction seat (21) connected to the universal joint module; a front fixed seat (22) connected to the rear traction seat (21), wherein a third support disc (43) is provided between the front fixed seat (22) and the rear traction seat (21); and an excitation unit located at one end of the front fixed seat (22) away from the rear traction seat (21), comprising a base column (231), magnetization mechanisms located at both ends of the base column (231), and a magnetic flux leakage detection module (3). The magnetic field signal acquisition mechanism is located in the middle of the base column (231). The magnetization mechanism includes magnetization components arranged at equal angles around the circumference of the base column (231). The magnetic field signal acquisition mechanism includes several signal acquisition components arranged at equal angles around the base column (231). The rear fixing seat (25) is located at one end of the excitation unit away from the front fixing seat (22). The tail seat (26) is connected to the rear fixing seat (25). The fourth support disc (44) is arranged between the rear fixing seat (25) and the tail seat (26). The outer diameter of the magnetization components is smaller than the outer diameter of the third support disc (43) and the fourth support disc (44).

2. The non-contact magnetic flux leakage internal detection device for pipelines according to claim 1, characterized in that, The signal acquisition component includes: an acquisition mounting base (2411), which is fixedly mounted on the side of the magnetization component near the universal joint module; a spring seat (2412), which is hinged to the acquisition mounting base (2411) by means of a pin (2414); a spring (2415), which is mounted on the pin (2414) to keep the spring seat (2412) open from the acquisition mounting base (2411); and a signal acquisition device (2415), which is connected to the end of the spring seat (2412) away from the spring seat (2412) by means of a bolt (2416).

3. The non-contact magnetic flux leakage internal detection device for pipelines according to claim 2, characterized in that, The magnetization assembly is a steel brush magnetization assembly or a steel brushless magnetization assembly; the steel brush magnetization assembly includes a magnet (232a1) connected to the base column (231), a fixing cover (232a2) disposed outside the magnet (232a1), and a steel brush (232a3) disposed outside the fixing cover (232a2); the steel brushless magnetization assembly includes a magnet connected to the base column (231) and a fixing cover disposed outside the magnet.

4. The non-contact magnetic flux leakage internal detection device for pipelines according to claim 3, characterized in that, The drive module includes: a front traction seat (11) connected to the universal joint module; an electronic cabin (12) connected to the front traction seat (11), with a second support disc (42) disposed between the electronic cabin (12) and the front traction seat (11); and a first drive cup (13) disposed between the front traction seat (11) and the electronic cabin (12), the bottom surface of the first drive cup (13) abutting against the second support disc (42). 13) The bowl opening faces the universal connection module; the top seat (14) is connected to the electronic cabin (12), and the first support disc (41) is provided between the top seat (14) and the electronic cabin (12); the second drive cup (15) is provided between the top seat (14) and the electronic cabin (12), the bottom surface of the second drive cup (15) abuts against the first support disc (41), and the bowl opening of the second drive cup (15) faces the first drive cup (13).

5. The non-contact magnetic flux leakage internal detection device for pipelines according to claim 3, characterized in that, The universal joint module includes: a first section (31), one end of which is hinged to the front traction seat (11) via a first hinge shaft (32); a middle section (33), one end of which is hinged to the first section (31) away from the front traction seat (11) via a second hinge shaft (34), the second hinge shaft (34) being perpendicular to the first hinge shaft (32); the middle section (33) having a threading hole (35) along the long-distance direction; and a tail section (36), one end of which is hinged to the middle section (33) via a third hinge shaft (37), the other end of which is hinged to the rear traction seat (21) via a fourth hinge shaft (38); the third hinge shaft (37) being parallel to the second hinge shaft (34), and the third hinge shaft (37) being perpendicular to the fourth hinge shaft (38).

6. A non-contact magnetic flux leakage internal detection device for pipelines according to claim 4 or 5, characterized in that, The first support disc (41), the second support disc (42), the third support disc (43) and the fourth support disc (44) have the same structure, each consisting of a disc support base (411) and a plurality of support wheels (412) arranged circumferentially on the outer edge of the disc support base (411).

7. A non-contact magnetic flux leakage internal detection device for pipelines according to claim 4, characterized in that, The drive module also includes a mileage wheel (51), which is located at one end of the electronic cabin (12) near the second drive cup (15). The mileage wheel (51) is used to provide spatial coordinates for the detection data and realize the accurate mileage positioning of the defect.

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