Natural gas pipeline corrosion defect detection device and method thereof

Abstract

The invention belongs to the field of pipeline detection, and provides a natural gas pipeline corrosion defect detection device and a method thereof.The natural gas pipeline corrosion defect detection device comprises a construction component, a construction part, an auxiliary part arranged on one side of the construction part and a detection part arranged on one side of the construction part, and the construction part comprises a positioning ring and a mounting frame arranged on the circumferential side face of the positioning ring; the detection piece comprises a rotating block rotationally arranged on the inner side of the mounting frame, a connecting rod fixedly installed at one end of the rotating block and a visual module fixedly connected to one end of the connecting rod, and the auxiliary piece comprises a sliding column arranged on the circumferential side face of the positioning ring in a sliding mode, an extrusion block fixedly installed at one end of the sliding column and a reset spring arranged on the outer side of the sliding column in a sleeving mode. According to the invention, the auxiliary parts comprise the sliding columns slidably arranged on the circumferential side surface of the positioning ring, the extrusion blocks fixedly mounted at one ends of the sliding columns and the reset springs sleeving the outer sides of the sliding columns, so that the device can conveniently and rapidly sleeve the outer sides of natural gas pipelines with different sizes and radiuses on the outer sides of the pipelines for mobile detection, and the detection efficiency of the device is improved.

Description

Technical Field

[0001] The invention belongs to the field of pipeline detection, in particular to a natural gas pipeline corrosion defect detection device and method. Background Art

[0002] As the proportion of natural gas in the energy structure increases, the safety and reliability of natural gas pipelines become particularly important. Pipeline corrosion is one of the main causes of natural gas leakage and pipeline accidents. Therefore, regular corrosion defect detection of natural gas pipelines is the key to ensuring their safe operation. In the existing technology, the detection method of natural gas pipeline corrosion defects mostly adopts manual detection. The manual detection method relies on the experience and skills of the detection personnel, is inefficient and easily affected by human factors, making it difficult to ensure the accuracy and consistency of the detection results.

[0003] A pulse eddy current detection device for corrosion defects on the outer wall of a pipeline is disclosed in a Chinese invention patent with the announcement number CN113358740A. It belongs to the field of electromagnetic nondestructive testing technology. The detection device includes inner and outer arc plates, which are connected by a rib plate. The inner arc plate is an array probe attachment plate. The outer arc plate is provided with a quick release device, and four sliding rollers are symmetrically distributed at both ends of the outer arc plate. The sliding rollers are connected to the inner side of the outer arc plate through a spring slide rod. The inner side of the inner arc plate is provided with an array probe arranged in a staggered manner. The inner side of the outer arc plate is connected to the inner arc plate through a rib plate, one side is connected by a hinge, and the other side is connected by a quick release structure.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: before use, they need to be installed on the outside of the pipeline through an installation mechanism, which is time-consuming and labor-intensive, and it is difficult to directly put them on the outside of the pipeline for detection, which affects the detection efficiency of the device and brings great inconvenience.

[0005] Therefore, those skilled in the art have proposed a natural gas pipeline corrosion defect detection device and method to solve the problems raised by the background technology. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a natural gas pipeline corrosion defect detection device and method thereof to solve the problem in the prior art that it is difficult to directly sleeve the device on the outside of the pipeline for detection, which affects the detection efficiency of the device.

[0007] A natural gas pipeline corrosion defect detection device and method thereof, comprising a structural assembly, including a structural member, an auxiliary member arranged on one side of the structural member, and a detection member arranged on one side of the structural member;

[0008] The structural member includes a positioning ring and a mounting frame arranged on the side surface of the positioning ring;

[0009] The detection member includes a rotating block rotatably arranged inside the mounting frame, a connecting rod fixedly installed at one end of the rotating block, and a visual module fixedly connected to one end of the connecting rod;

[0010] The auxiliary component includes a sliding column slidably arranged on the side surface of the positioning ring, an extrusion block fixedly installed on one end of the sliding column and a return spring sleeved on the outside of the sliding column, the two ends of the return spring are respectively connected to the side wall of the extrusion block and the inner wall of the fixed ring, and the other end of the sliding column passes through the positioning ring and is connected to the bottom end of the rotating block.

[0011] Preferably, the auxiliary component further comprises an inclined portion arranged on one side of the extrusion block, and a roller rotatably connected to one end of the inclined portion.

[0012] Preferably, the detection member also includes a rotating shaft rotatably arranged between the side walls of the mounting frame, the rotating block is arranged on the outside of the rotating shaft, and the detection member also includes a compression spring arranged on the inner side of the rotating block, and the two ends of the compression spring are respectively connected to the side wall of the rotating block and the outer side of the positioning ring.

[0013] Preferably, the auxiliary parts and positioning parts are provided in three groups and are evenly distributed on the peripheral side surface of the positioning ring.

[0014] Preferably, the natural gas pipeline corrosion defect detection device further comprises a cleaning assembly arranged on one side of the positioning ring, and the cleaning assembly comprises a snap-fit ​​member arranged on one side of the positioning ring and a cleaning member arranged on one end of the snap-fit ​​member.

[0015] Preferably, the fastener includes an insertion rod slidably arranged on one side of the positioning ring, an installation groove opened on one side of the insertion rod, a clamping block slidably arranged on one side of the installation groove, and a first spring arranged on the inner side of the installation groove, and the two ends of the first spring are respectively connected to the side wall of the clamping block and the side wall of the installation groove.

[0016] Preferably, the cleaning member comprises a fixing ring arranged on one side of the insertion rod, a threaded sleeve arranged on both sides of the fixing ring, and a screw threadedly connected to the inside of the threaded sleeve;

[0017] The cleaning piece also includes an arc-shaped scraper which is rotatably connected to the inside of the screw.

[0018] Preferably, the arc-shaped scraper is arranged inside the raised portion.

[0019] Preferably, the cleaning member further comprises a rotating ring arranged on the peripheral side of the screw.

[0020] A natural gas pipeline corrosion defect detection method is applied to any of the natural gas pipeline corrosion defect detection devices described above, S1: ensuring that the structural parts, auxiliary parts and detection parts are correctly installed and in working condition;

[0021] S2: After inserting the structural component into the outside of the pipeline to be inspected, adjust the auxiliary component, slide the sliding column and the extrusion block, and use the elastic force of the return spring to make the extrusion block contact with the surface of the natural gas pipeline to fix the detection device on the pipeline;

[0022] S3, triggering the rotating block to rotate inside the mounting frame, driving the connecting rod and the visual module to rotate accordingly, so that they are close to the outer wall of the pipeline, and then starting to detect the outer surface of the natural gas pipeline;

[0023] S6: During the inspection, the surface of the natural gas pipeline is visually scanned by the visual module to detect corrosion defects;

[0024] S7: When there are impurities and dirt on the outer wall of the pipeline that need to be cleaned, install the fastener to clean the outer wall of the pipeline during inspection;

[0025] S8: During the cleaning process, the screw drives the arc scraper to move inward to make it close to the outer wall of the pipeline, and the convex part of the arc scraper is used to scrape the corroded part of the pipeline surface;

[0026] S9: After the cleaning is completed, the screw position is adjusted by the rotating ring to reset the cleaning piece and prepare for the next inspection or cleaning;

[0027] S10: reciprocating the device until the outer wall of the entire natural gas pipeline is cleaned;

[0028] S11: After cleaning, repeat S6 to start testing the outer wall of the pipeline.

[0029] Through the above technical solution,

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention reduces the reliance on manual inspection and improves the inspection efficiency through an automated inspection device. At the same time, the use of a visual module for precise scanning enhances the accuracy and consistency of the inspection results. At the same time, auxiliary parts including a sliding column slidably arranged on the side surface of the positioning ring, an extrusion block fixedly installed on one end of the sliding column, and a return spring sleeved on the outside of the sliding column can facilitate the device to be quickly sleeved on the outside of natural gas pipelines with different radii for mobile inspection, thereby improving the inspection efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the extrusion block in the present invention;

[0034] Figure 3 The schematic diagram of the structure of the extrusion block in the present invention is

[0035] Figure 4 A side view of the present invention;

[0036] Figure 5 is a side view of the positioning ring in the present invention;

[0037] Figure 6 It is a structural schematic diagram of the visual module in the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of the cleaning component in the present invention;

[0039] Figure 8 It is a structural schematic diagram of the card block in the present invention;

[0040] In the figure:

[0041] 100, structural component; 101, structural part; 101a, positioning ring; 101b, mounting frame; 102, auxiliary part; 102a, sliding column; 102b, extrusion block; 102c, return spring; 102d, inclined portion; 102e, roller; 103, detection part; 103a, rotating block; 103b, connecting rod; 103c, visual module; 103d, rotating shaft; 103e, compression spring; 200, cleaning component; 201, snap-fit ​​part; 201a, insertion rod; 201b, mounting groove; 201c, clamping block; 201d, first spring; 202, cleaning part; 202a, fixing ring; 202b, threaded sleeve; 202c, screw; 202d, arc scraper; 202e, raised portion; 202f, rotating ring. DETAILED DESCRIPTION

[0042] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0043] Embodiment 1: As shown in the attached Figure 1 To Attachment Figure 3 As shown: The present invention provides a natural gas pipeline corrosion defect detection device and method, including a structural assembly 100, including a structural member 101, an auxiliary member 102 arranged on one side of the structural member 101, and a detection member 103 arranged on one side of the structural member 101;

[0044] The structural member 101 includes a positioning ring 101a and a mounting frame 101b disposed on the side surface of the positioning ring 101a, and the mounting frame 101b is used to mount the detection member 103;

[0045] The detection member 103 includes a rotating block 103a rotatably arranged inside the mounting frame 101b, a connecting rod 103b fixedly installed at one end of the rotating block 103a, and a visual module 103c fixedly connected to one end of the connecting rod 103b. The visual module 103c includes a camera, a lens, a visual sensor and a light source sensor, which can effectively take photos to detect corrosion defects on the surface of the oil and gas pipeline;

[0046] The auxiliary component 102 includes a sliding column 102a slidably arranged on the peripheral side of the positioning ring 101a, an extrusion block 102b fixedly installed on one end of the sliding column 102a, and a return spring 102c sleeved on the outside of the sliding column 102a, the two ends of the return spring 102c are respectively connected to the side wall of the extrusion block 102b and the inner wall of the fixed ring 202a, the other end of the sliding column 102a passes through the positioning ring 101a and is connected to the bottom end of the rotating block 103a, the return spring 102c is used to drive the sliding column 102a and the extrusion block 102b to reset. When the pipeline is inserted into the positioning ring 101a, the pipeline will first squeeze the internal extrusion block 102b to drive it to slide downward, and then the resilience of the return spring 102c drives the extrusion block 102b to reset and slide so that it is always close to the internal pipeline, thereby realizing the auxiliary clamping sleeve installation processing of the pipeline.

[0047] like Figure 3 As shown, further, the auxiliary component 102 also includes a sloped portion 102d arranged on one side of the extrusion block 102b, and a roller 102e rotatably connected to one end of the sloped portion 102d. Through the arrangement of the sloped portion 102d, during the insertion process, the pipe first contacts the sloped portion 102d of the extrusion block 102b, and the extrusion sloped portion 102d drives the extrusion block 102b to slide outward. After sliding, the pipe is clamped and fixed by the return spring 102c. At the same time, when the device needs to slide on the outside of the pipe after clamping, the friction loss between the extrusion block 102b and the pipe can be reduced by the arrangement of the roller 102e, so as to facilitate driving the device to slide on the outside of the pipe.

[0048] As attached Figure 6 As shown, the detection member 103 also includes a rotating shaft 103d rotatably arranged between the side walls of the mounting frame 101b, and the rotating block 103a is arranged on the outside of the rotating shaft 103d. The detection member 103 also includes a compression spring 103e arranged on the inner side of the rotating block 103a, and the two ends of the compression spring 103e are respectively connected to the side wall of the rotating block 103a and the outside of the positioning ring 101a. The rotating shaft 103d can be used to facilitate the rotating block 103a to rotate slightly in the mounting frame 101b, and the compression spring 103e can be used to reset the rotating block 103a after it rotates.

[0049] See attached Figure 4 - Attachment Figure 6As shown, specifically, three groups of auxiliary members 102 and positioning members are arranged and are evenly distributed on the peripheral side of the positioning ring 101a. This arrangement can improve the stability of the device after being sleeved on the outside of the pipeline and reduce the phenomenon of unstable sliding of the positioning ring 101a after sleeved.

[0050] As can be seen from the above, when in use, after the positioning block is inserted into the outside of the steel pipe with inspection, the rebound force of the reset spring 102c drives the extrusion block 102b to reset and slide so that it is always close to the internal pipeline, thereby realizing the auxiliary clamping sleeve installation processing of the pipeline, and then the corrosion defects on the surface of the oil and gas pipeline are photographed and inspected through the set visual module 103c.

[0051] During the insertion process, the steel pipe squeezes the inclined portion 102d of the internal extrusion block 102b, driving the extrusion block 102b to slide outward, thereby driving the sliding column 102a to slide, squeezing the bottom end of the rotating block 103a while sliding, thereby driving the rotating block 103a to rotate slightly in the mounting frame 101b, thereby driving the connecting rod 103b and the visual module 103c to rotate so that they are close to the outer surface of the pipeline. When the extrusion block 102b inside the positioning ring 101a is close to the outer wall of the pipeline, the distance of the sliding squeezed by the pipeline is just enough to make the rotation angle of the rotating block 103a drive the visual module 103c to move closer to the direction of the pipeline, thereby improving the detection effect of the visual module 103c, so that the device can quickly install mobile detection on the outside of natural gas pipelines with different radii, thereby improving the detection efficiency of the device.

[0052] When the device needs to be taken out, the positioning ring 101a is pulled out, and the rotating block 103a is reset and rotated by the rebound force of the compression spring 103e, thereby driving the connecting rod 103b and the visual module 103c to rotate in the direction of the principle pipeline. At the same time, when the rotating block 103a rotates, it drives the sliding column 102a to slide toward the inside of the positioning ring 101a. At the same time, the sliding column 102a and the extrusion block 102b are also reset and slide inward by the rebound force of the reset spring 102c for the next installation, positioning and fixing process.

[0053] Embodiment 2: As shown in the attached Figure 7As shown: This embodiment is basically the same as the previous embodiment, with the difference that the detection device also includes a cleaning component 200 arranged on one side of the positioning ring 101a, the cleaning component 200 includes a snap-fitting piece 201 arranged on one side of the positioning ring 101a, and a cleaning component 202 arranged at one end of the snap-fitting piece 201, the snap-fitting piece 201 includes an insertion rod 201a slidably arranged on one side of the positioning ring 101a, an installation groove 201b opened on one side of the insertion rod 201a, a block 201c slidably arranged on one side of the installation groove 201b, and a first spring 201d arranged on the inner side of the installation groove 201b, the two ends of the first spring 201d are respectively connected to the side wall of the block 201c and the side wall of the installation groove 201b, and when the cleaning component 200 needs to be installed, the insertion rod 201a can be inserted into one side of the positioning ring 101a to quickly fix and install it.

[0054] As attached Figure 8 As shown, the cleaning member 202 includes a fixing ring 202a disposed on one side of the insertion rod 201a, a threaded sleeve 202b disposed on both sides of the fixing ring 202a, and a screw 202c threadedly connected to the inside of the threaded sleeve 202b. The cleaning member 202 also includes an arc scraper 202d rotatably connected to the inside of the screw 202c, and the inside of the arc scraper 202d is disposed at the raised portion 202e. The cleaning member 202 also includes a rotating ring 202f disposed on the side surface of the screw 202c. After the rod 202c and the threaded sleeve 202b are mounted on the outer wall of the pipe, the screw 202c can be rotated to drive the arc scraper 202d to slide inward so that it is close to the outer wall of the pipe. The arc scraper 202d and the raised portion 202e can be easily scraped and removed from the sludge and impurities on the outer wall of the pipe during movement, thereby improving the detection effect of the device and reducing the impact of sludge and debris on the shooting effect of the visual module 103c. The screw 202c can be easily rotated by the rotating ring 202f.

[0055] As can be seen from the above, when the outer wall of the pipe needs to be cleaned, the insertion rod 201a is inserted into one side of the positioning ring 101a. During insertion, the fixing ring 202a is fixedly installed on the side wall of the positioning ring 101a through the provided snap-fit ​​part 201, and then the device is inserted into the outer wall of the pipe. After insertion, the screw 202c is rotated to drive the internal arc scraper 202d to move inward until it contacts the outer wall of the pipe. The moving device first scrapes and cleans the sludge on the outer wall of the pipe through the provided arc scraper 202d and the raised part 202e. After cleaning, the visual module 103c is used for photographic detection, thereby improving the detection effect of the device and reducing the impact of sludge and debris on the shooting effect of the visual module 103c.

[0056] Embodiment 3: Different from the above two embodiments, a natural gas pipeline corrosion defect detection method is applied to the above natural gas pipeline corrosion defect detection device, S1: ensure that the structural component 101, the auxiliary component 102 and the detection component 103 are correctly installed and in working condition;

[0057] S2: After the structural member 101 is inserted into the outside of the pipeline to be inspected, the auxiliary member 102 is adjusted, and the extrusion block 102b is brought into contact with the surface of the natural gas pipeline by sliding the sliding column 102a and the extrusion block 102b and utilizing the elastic force of the return spring 102c, so as to fix the inspection device on the pipeline;

[0058] S3, triggering the rotating block 103a to rotate inside the mounting frame 101b, driving the connecting rod 103b and the visual module 103c to rotate accordingly, so that they are close to the outer wall of the pipeline, and then start to detect the outer surface of the natural gas pipeline;

[0059] S6: During the inspection, the surface of the natural gas pipeline is visually scanned by the visual module 103c to detect corrosion defects;

[0060] S7: When there are impurities and dirt on the outer wall of the pipeline that need to be cleaned, the fastener 201 is installed to clean the outer wall of the pipeline during detection;

[0061] S8: During the cleaning process, the screw 202c drives the arc scraper 202d to move inward so that it is close to the outer wall of the pipeline, and the corroded part of the pipeline surface is scraped off by the raised part 202e of the arc scraper 202d;

[0062] S9: After the cleaning is completed, the position of the screw 202c is adjusted by the rotating ring 202f to reset the cleaning member 202 and prepare for the next inspection or cleaning;

[0063] S10: reciprocating the device until the outer wall of the entire natural gas pipeline is cleaned;

[0064] S11: After cleaning, repeat S6 to start testing the outer wall of the pipeline.

[0065] As can be seen from the above, first, ensure that the structural member 101, auxiliary member 102 and detection member 103 of the device are correctly installed and in working condition. Next, insert the structural member 101 into the outside of the pipeline to be detected, and use the elastic force of the sliding column 102a and the extrusion block 102b in the auxiliary member 102 and the reset spring 102c to fix the device. Then, trigger the rotation block 103a to rotate, drive the connecting rod 103b and the visual module 103c to detect the outer surface of the pipeline, and use the visual module 103c to perform visual scanning to identify corrosion defects. During the inspection process, if impurities or dirt are found on the outer wall of the pipeline, use the cleaning component 200 to clean it, and the screw 202c drives the arc scraper 202d to move and use its raised part 202e to scrape off the corroded part. After the cleaning is completed, adjust the position of the screw 202c through the rotating ring 202f to reset the cleaning member 202, and then reciprocate the device to complete the cleaning of the entire outer wall of the pipeline. Finally, after cleaning, the inspection steps are repeated to ensure that the corrosion defects on the outer wall of the pipeline are effectively detected and cleaned. This method improves the automation of detection, improves the accuracy and efficiency of detection, and integrates the cleaning function, reduces manual intervention, and improves operational safety.

[0066] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0067] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0071] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0072] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural gas pipeline corrosion defect detection device, characterized in that: include: A structural component (100) comprises a structural component (101), an auxiliary component (102) arranged on one side of the structural component (101), and a detection component (103) arranged on one side of the structural component (101); The structural member (101) comprises a positioning ring (101a) and a mounting frame (101b) arranged on the side surface of the positioning ring (101a); The detection member (103) comprises a rotating block (103a) rotatably arranged inside the mounting frame (101b), a connecting rod (103b) fixedly installed at one end of the rotating block (103a), and a visual module (103c) fixedly connected to one end of the connecting rod (103b); The auxiliary component (102) comprises a sliding column (102a) slidably arranged on the peripheral side of the positioning ring (101a), an extrusion block (102b) fixedly installed on one end of the sliding column (102a), and a return spring (102c) sleeved on the outside of the sliding column (102a), the two ends of the return spring (102c) are respectively connected to the side wall of the extrusion block (102b) and the inner wall of the fixed ring (202a), and the other end of the sliding column (102a) passes through the positioning ring (101a) and is connected to the bottom end of the rotating block (103a).

2. A natural gas pipeline corrosion defect detection device as claimed in claim 1, characterized in that: The auxiliary component (102) further comprises an inclined portion (102d) arranged on one side of the extrusion block (102b) and a roller (102e) rotatably connected to one end of the inclined portion (102d).

3. A natural gas pipeline corrosion defect detection device as claimed in claim 1, characterized in that: The detection member (103) further comprises a rotating shaft (103d) rotatably arranged between the side walls of the mounting frame (101b), the rotating block (103a) being arranged on the outside of the rotating shaft (103d), and the detection member (103) further comprises a compression spring (103e) arranged on the inner side of the rotating block (103a), and the two ends of the compression spring (103e) are respectively connected to the side wall of the rotating block (103a) and the outer side of the positioning ring (101a).

4. A natural gas pipeline corrosion defect detection device as claimed in claim 2, characterized in that: The auxiliary parts (102) and positioning parts are arranged in three groups and are evenly distributed on the peripheral side surface of the positioning ring (101a).

5. A natural gas pipeline corrosion defect detection device as claimed in claim 1, characterized in that: The natural gas pipeline corrosion defect detection device further comprises a cleaning assembly (200) arranged on one side of the positioning ring (101a), and the cleaning assembly (200) comprises a fastener (201) arranged on one side of the positioning ring (101a) and a cleaning member (202) arranged at one end of the fastener (201).

6. A natural gas pipeline corrosion defect detection device as claimed in claim 5, characterized in that: The locking member (201) comprises an insertion rod (201a) slidably arranged on one side of the positioning ring (101a), a mounting groove (201b) opened on one side of the insertion rod (201a), a clamping block (201c) slidably arranged on one side of the mounting groove (201b), and a first spring (201d) arranged on the inner side of the mounting groove (201b), wherein two ends of the first spring (201d) are respectively connected to the side wall of the clamping block (201c) and the side wall of the mounting groove (201b).

7. A natural gas pipeline corrosion defect detection device as claimed in claim 5, characterized in that: The cleaning member (202) comprises a fixing ring (202a) arranged on one side of the insertion rod (201a), a threaded sleeve (202b) arranged on both sides of the fixing ring (202a), and a screw (202c) threadedly connected to the inside of the threaded sleeve (202b); The cleaning member (202) further comprises an arc-shaped scraper (202d) rotatably connected to the interior of the screw rod (202c).

8. A natural gas pipeline corrosion defect detection device as claimed in claim 7, characterized in that: The arc-shaped scraper (202d) is arranged inside the raised portion (202e).

9. A natural gas pipeline corrosion defect detection device as claimed in claim 7, characterized in that: The cleaning member (202) further comprises a rotating ring (202f) arranged on the peripheral side of the screw rod (202c).

10. A natural gas pipeline corrosion defect detection method, applied to the natural gas pipeline corrosion defect detection device as claimed in any one of claims 1 to 9, characterized in that: S1: ensuring that the structural component (101), the auxiliary component (102) and the detection component (103) are all correctly installed and in working condition; S2: After the structural component (101) is inserted into the outside of the pipeline to be inspected, the auxiliary component (102) is adjusted, and the extrusion block (102b) is brought into contact with the surface of the natural gas pipeline by means of the elastic force of the return spring (102c) through the sliding column (102a) and the extrusion block (102b), so as to fix the inspection device on the pipeline; S3, triggering the rotating block (103a) to rotate inside the mounting frame (101b), driving the connecting rod (103b) and the visual module (103c) to rotate accordingly, so that they are closely attached to the outer wall of the pipeline, and then starting to detect the outer surface of the natural gas pipeline; S6: During the inspection, the surface of the natural gas pipeline is visually scanned by a visual module (103c) to detect corrosion defects; S7: When there are impurities and dirt on the outer wall of the pipeline that need to be cleaned, the fastener (201) is installed to clean the outer wall of the pipeline during inspection; S8: During the cleaning process, the screw (202c) drives the arc-shaped scraper (202d) to move inward so that it is close to the outer wall of the pipeline, and the corroded part of the pipeline surface is scraped off by the raised part (202e) of the arc-shaped scraper (202d); S9: After the cleaning is completed, the position of the screw rod (202c) is adjusted by the rotating ring (202f) to reset the cleaning member (202) to prepare for the next inspection or cleaning; S10: reciprocating the device until the outer wall of the entire natural gas pipeline is cleaned; S11: After cleaning, repeat S6 to start testing the outer wall of the pipeline.

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