Steel pipeline internal corrosion detection device and working method thereof

Abstract

The invention discloses a steel pipeline internal corrosion detection device and a working method thereof, and belongs to the technical field of oil pipeline measurement. The device comprises a vehicle body; a plurality of ultrasonic probes are circumferentially arranged at the front end of the vehicle body; driving parts are mounted at the rear end of the vehicle body; a processor, a motor and a battery which are electrically connected with one another are arranged in the vehicle body; an output shaft of the motor extends out of the vehicle body and is connected with a driving piece; the processor is electrically connected with the ultrasonic probe; a charging socket is further formed in one side of the vehicle body and used for charging the battery. The inner wall of the steel pipeline is subjected to ultrasonic detection through the multiple ultrasonic probes so as to find the corrosion part of the inner wall, the detection efficiency is high, pipeline excavation is not needed, normal pipeline transportation is not affected, and detection is convenient.

Description

Technical Field

[0001] This invention belongs to the field of oil pipeline measurement technology, and relates to a corrosion detection device for steel pipelines and its working method. Background Technology

[0002] Corrosion of the inner wall of steel pipelines is a complex process involving multiple factors, directly affecting the safe operation and service life of the pipeline. This process is primarily due to the unavoidable presence of various corrosive impurities in the medium transported within the pipeline. Under specific environmental conditions inside the pipeline, such as the combined effects of temperature, pressure, flow velocity, and alternating stress, these impurities continuously erode the inner wall material. The factors inducing pipeline corrosion are extremely broad, including but not limited to the chemical composition and physical state of the medium, as well as the pipeline's operating environment. Corrosion types are also diverse, with the most common being chemical corrosion, electrochemical corrosion, stress corrosion, erosion, and bacterial corrosion. Each type of corrosion has its unique mechanism and specific impact on the pipeline material. Chemical corrosion refers to the direct chemical reaction between the inner wall of the pipeline and corrosive substances in the medium, leading to oxidation or dissolution of the metal surface. During crude oil transportation, components such as sulfides, naphthenic acids, and alkali metal salts in crude oil can react chemically with the inner wall of steel pipelines under specific conditions, causing chemical corrosion. This type of corrosion often leads to thinning of the pipeline wall, and in severe cases, may cause leaks. Electrochemical corrosion is more complex, involving charge transfer between the metal and the electrolyte solution. During natural gas transportation, components such as H2S (hydrogen sulfide), CO2 (carbon dioxide), and water vapor (H2O) in natural gas can form an electrolyte solution inside the pipeline. When these components come into contact with the inner wall of the steel pipeline, a galvanic cell reaction occurs, leading to electrochemical corrosion. This corrosion not only thins the pipeline wall but can also cause localized perforation or stress concentration, further exacerbating pipeline damage. Stress corrosion is a low-stress brittle fracture phenomenon of metals under specific corrosive environments and stress. During pipeline operation, factors such as temperature fluctuations, pressure changes, and alternating stress generated by medium flow can induce stress corrosion. Once stress corrosion occurs, pipeline damage is often sudden and catastrophic. Furthermore, erosion is also an important form of corrosion on the inner wall of pipelines. When the medium contains hard particles or flows at high speeds, these particles can scour and abrade the inner wall of the pipeline, leading to increased surface roughness, thinning of the wall, and even perforation. Bacterial corrosion is a biological corrosion phenomenon. Under certain conditions, bacteria capable of corroding metals may proliferate inside pipelines. These bacteria corrode the pipeline's inner wall through mechanisms such as acidic substances produced by their metabolic activities or biofilms. In summary, corrosion of the steel inner wall of oil pipelines is a complex process involving multiple factors. To ensure the safe operation of pipelines and extend their service life, effective anti-corrosion measures and regular inspection and maintenance are essential to address the challenges posed by various types of corrosion.

[0003] Corrosion is one of the main causes of oil pipeline leaks. It not only silently erodes the inner walls of pipelines but also, over time, builds a serious threat to pipeline integrity and safety, becoming a key factor contributing to frequent oil pipeline leaks. Regular internal corrosion inspections act as a robust defense, protecting the safety and stability of oil pipelines. Timely analysis of inspection results can accurately assess the degree of corrosion and risk level, and further reveal the causes of corrosion, such as water quality, soil environment, and the chemical composition of the transported medium, thus providing strong support for developing scientific and reasonable maintenance strategies. For different degrees of corrosion, various measures can be taken, such as cleaning and rust removal, coating repair, local reinforcement, or replacement of damaged pipe sections, ensuring the targeted and effective nature of maintenance work. More importantly, through regular internal corrosion inspections, we can achieve "early detection and early treatment," effectively curbing further corrosion development, slowing down the aging process of pipelines, and significantly extending their service life. This is not only a conservation of resources but also a dual contribution to environmental protection and economic benefits. Imagine if intervention were possible in the early stages of corrosion, compared to allowing it to deteriorate to the point of requiring large-scale replacement. This would undoubtedly significantly reduce the enormous costs associated with pipeline replacement and avoid the economic losses and social impact of prolonged outages. Furthermore, regular inspections improve pipeline management and enhance the maintenance team's control over pipeline health. It requires managers to possess a high degree of responsibility and a keen awareness of risk, continuously optimizing inspection cycles and plans to ensure the continuity and effectiveness of inspection work. Regular internal corrosion inspections can promptly detect and address potential corrosion problems, effectively preventing leaks and ensuring the safe operation of pipelines. Internal corrosion inspections accurately assess the degree of corrosion and risk level of pipelines, providing a basis for developing targeted maintenance and replacement plans, ensuring pipeline operation under controllable risks. Timely detection and treatment of internal corrosion problems can slow down the corrosion rate, extend pipeline lifespan, and reduce costs associated with pipeline replacement. Regular inspections allow for remedial measures before corrosion worsens, avoiding large-scale maintenance work and thus reducing maintenance costs.

[0004] Detecting corrosion in pipelines is crucial for pipeline repair. Currently, methods for detecting pipeline corrosion include excavation and inspection or pressure testing, which are costly and generally require shutting down the pipeline. Therefore, there is a need to design a device that can detect corrosion inside steel pipelines without shutting down the pipeline. Summary of the Invention

[0005] The purpose of this invention is to provide a steel pipeline internal corrosion detection device and its working method, so as to solve the technical problem that existing technologies require excavation for inspection or pipeline pressure testing when detecting pipeline corrosion, which requires pipeline shutdown.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] In a first aspect, the present invention provides a steel pipe internal corrosion detection device, comprising a vehicle body; a plurality of ultrasonic probes are arranged circumferentially at the front end of the vehicle body; a drive component is installed at the rear end of the vehicle body; a processor, a motor and a battery are electrically connected to each other inside the vehicle body; the output shaft of the motor extends out of the vehicle body and is connected to the drive component; the processor is electrically connected to the ultrasonic probes; a charging port is also provided on one side of the vehicle body for charging the battery.

[0008] Furthermore, a cleaning device is installed at the front end of the vehicle body; the cleaning device includes a motor; an internal gear is fixedly connected to the outer wall of the motor; a rotating shaft is connected to the output shaft of the motor; a gear is connected to one side of the rotating shaft through a first crank; the gear meshes with the internal gear; a cleaning block is installed on the first crank.

[0009] Furthermore, the cleaning block is mounted on the first crank via a slide bar; the slide bar is slidable along the axial direction of the first crank; one end of the slide bar is vertically connected to a slide groove; a slide column is provided in the slide groove, and the slide column is slidable within the slide groove; the slide column is connected to a gear via a second crank.

[0010] Furthermore, the rotating shaft is fitted with a sleeve; the sleeve is fixedly connected to the outer wall of the motor; the front end of the cleaning block is conical.

[0011] Furthermore, the sleeve is provided with several support walls in the circumferential direction; one end of the support wall is connected to the sleeve, and the other end is fixedly connected to the end face of the internal gear.

[0012] Furthermore, a sealing baffle is installed on the charging port.

[0013] Furthermore, the vehicle body is provided with a buffer device around its circumference to protect the vehicle body.

[0014] Furthermore, the cushioning device is an elastic cup.

[0015] Furthermore, the driving component is a propeller.

[0016] Secondly, the present invention provides a method for operating the above-mentioned steel pipe internal corrosion detection device, comprising the following steps:

[0017] The motor drives the vehicle body to move through the drive components, while the ultrasonic probe performs ultrasonic detection on the inner wall of the steel pipe to locate the corrosion sites.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention discloses a steel pipe internal corrosion detection device and its working method. Several ultrasonic probes are installed on the outer wall of one end of the vehicle body. A motor and processor are installed inside the vehicle body. The motor output shaft extends out of the vehicle body and connects to a paddle. The processor is electrically connected to the ultrasonic probes and the motor. Multiple ultrasonic probes are used to perform ultrasonic detection on the inner wall of the steel pipe to locate the corrosion sites. This method offers high detection efficiency, eliminates the need for pipe excavation, does not disrupt normal pipeline transportation, and is convenient for detection.

[0020] Furthermore, the outer wall of the vehicle body of the present invention is provided with an elastic cup that can contact the inner wall of the steel pipe, serving as a buffer and protective device.

[0021] Furthermore, the front end of the vehicle body of the present invention is provided with a cleaning device. The cleaning device is driven by a motor, which drives the first crank to rotate, drives the gear to mesh with the internal gear, drives the second crank to rotate, and causes the slide column to slide in the slide groove. This causes the slide bar to move back and forth along the axial direction of the first crank. At the same time, as the first crank rotates, it drives the cleaning block to move, thereby scanning the inner wall of the pipe along a circumferential wave-shaped trajectory and cleaning the corroded and blocked parts. When the corrosion is more severe, the cleaning block can clean the corroded and blocked parts of the inner wall of the pipe, so that the ultrasonic sensor can make more accurate measurements. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a side view of the vehicle body of the present invention;

[0024] Figure 2 This is a schematic diagram of the cleaning device of the present invention;

[0025] Figure 3 This is a schematic diagram showing the connection between the internal gear and the sleeve of the present invention.

[0026] Wherein: 1-Car body; 2-Ultrasonic probe; 3-Motor; 4-Processor; 5-Paddle blade; 6-Battery; 7-Charging port; 8-Sealing baffle; 9-Elastic cup; 10-Motor; 11-Shaft; 12-Sleeve; 13-First crank; 14-Support wall; 15-Internal gear; 16-Gear; 17-Sliding strip; 18-Slide groove body; 19-Second crank; 20-Sliding column; 21-Cleaning block. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0033] The present invention will now be described in further detail with reference to the accompanying drawings:

[0034] See Figure 1 This invention discloses a steel pipe internal corrosion detection device, characterized by comprising a vehicle body 1; a plurality of ultrasonic probes 2 are circumferentially arranged at the front end of the vehicle body 1; a drive component is installed at the rear end of the vehicle body 1; a processor 4, a motor 3, and a battery 6 are electrically connected to each other inside the vehicle body 1; the output shaft of the motor 3 extends to the outside of the vehicle body 1 and is connected to the drive component; the processor 4 is electrically connected to the ultrasonic probes 2; and a charging port 7 is also provided on one side of the vehicle body 1 for charging the battery 6. When the device is working, the motor 3 drives the vehicle body 1 to move via the drive component, and the multiple ultrasonic probes 2 perform ultrasonic detection on the inner wall of the steel pipe to locate the corrosion sites. This method offers high detection efficiency, eliminates the need for pipe excavation, and is convenient for detection.

[0035] In one feasible embodiment of the present invention, see [link to relevant documentation]. Figure 2 and Figure 3 A cleaning device is installed at the front end of the vehicle body 1; the cleaning device includes a motor 10; an internal gear 15 is fixedly connected to the outer wall of the motor 10; the output shaft of the motor 10 is connected to a rotating shaft 11; one side of the rotating shaft 11 is connected to a gear 16 through a first crank 13; the gear 16 meshes with the internal gear 15; a cleaning block 21 is installed on the first crank 13, which can clean the corroded and blocked parts of the pipe inner wall so that the ultrasonic sensor can make more accurate measurements.

[0036] In one feasible embodiment of the present invention, the cleaning block 21 is mounted on the first crank 13 via a slide bar 17; the slide bar 17 is slidable along the axial direction of the first crank 13; one end of the slide bar 17 is vertically connected to a slide groove 18; a slide column 20 is provided in the slide groove 18, and the slide column 20 is slidable in the slide groove 18; the slide column 20 is connected to a gear 16 via a second crank 19.

[0037] In one feasible embodiment of the present invention, the rotating shaft 11 is fitted with a sleeve 12; the sleeve 12 is fixedly connected to the outer wall of the motor 10; the front end of the cleaning block 21 is conical, which increases the cleaning area. The conical design encounters relatively less resistance during movement, which helps to quickly penetrate the dirt layer and improve cleaning efficiency; especially when facing stubborn stains, the conical design can apply force more effectively, helping to quickly decompose and remove stains. The sleeve 12 is circumferentially provided with several support walls 14; one end of the support wall 14 is connected to the sleeve 12, and the other end is fixedly connected to the end face of the internal gear 15, making the entire structure more stable.

[0038] In one feasible embodiment of the present invention, a sealing baffle 8 is installed on the charging port 7 to effectively prevent foreign objects from entering the charging port 7. A buffer device is provided around the vehicle body 1 to protect the vehicle body 1. Preferably, the buffer device can be an elastic cup 9. The driving component is a paddle 5.

[0039] This invention discloses a method for operating the above-mentioned corrosion detection device for steel pipes, comprising the following steps:

[0040] Motor 3 drives the vehicle body 1 to move through the drive components, while ultrasonic probe 2 performs ultrasonic detection on the inner wall of the steel pipe to locate the corrosion sites.

[0041] When corrosion is severe, the pipe needs to be cleaned. Start the motor 10 to rotate the first crank 13, which in turn drives the gear 16 to mesh with the internal gear 15, causing the second crank 19 to rotate. This causes the slide column 20 to slide within the slide groove 18, and the slide bar 17 to move back and forth along the axial direction of the first crank 13. At the same time, as the first crank 13 rotates, it also drives the cleaning block 21 to move, thereby scanning the inner wall of the pipe along a circumferential wavy trajectory and cleaning the corroded and blocked parts so that the ultrasonic sensor can make more accurate measurements.

[0042] The working principle of this invention is as follows:

[0043] First, this invention uses several ultrasonic probes 2 mounted on the outer wall of one end of the vehicle body 1 to perform ultrasonic detection on the inner wall of steel pipes, thereby locating corrosion sites. This method offers high detection efficiency, eliminates the need for pipe excavation, and facilitates convenient detection. Furthermore, a motor 3 and a processor 4 are installed inside the vehicle body. The motor 3 is connected to a paddle 5 at the other end of the vehicle body, enabling the device to move forward within the pipe under test. The processor 4 wirelessly connects to a user terminal for remote control. Second, in areas with severe pipe wall corrosion, the detection accuracy of the ultrasonic probes 2 is affected, necessitating pipe wall cleaning. In this case, the motor 10 is activated, rotating the first crank 13, which in turn meshes the gear 16 with the internal gear 15, causing the second crank 19 to rotate. This causes the sliding column 20 to slide within the sliding groove 18, and the sliding strip 17 to reciprocate along the axial direction of the first crank 13. Simultaneously, as the first crank 13 rotates, it moves the cleaning block 21, thereby scanning the inner wall of the pipe along a circumferential wavy trajectory and cleaning corroded or blocked areas, allowing the ultrasonic sensor to perform more accurate measurements.

[0044] Example:

[0045] This embodiment discloses a corrosion detection device for steel pipes, comprising: a vehicle body 1, with several ultrasonic probes 2 mounted on the outer wall of one end of the vehicle body 1; a motor 3 and a processor 4 housed inside the vehicle body 1; the output shaft of the motor 3 extends out of the vehicle body 1 and connects to a paddle 5; and the processor 4 is electrically connected to the ultrasonic probes 2 and the paddle 5. The processor 4 is wirelessly connected to a user terminal for remote control. A battery 6 is housed inside the vehicle body 1 to power the various electronic components. A charging port 7 is located on the outer wall of the vehicle body 1 and is electrically connected to the battery 6. A sealing baffle 8 is mounted on the charging port 7 and is connected to the outer wall of the vehicle body 1 by screws for charging the detection device. An elastic cup 9 is mounted on the outer wall of the vehicle body 1 to contact the inner wall of the steel pipe, providing cushioning and protection for the device. A motor 10 is installed at the end of the vehicle body 1 away from the blade 5. The output shaft of the motor 10 is connected to one end of the rotating shaft 11. The other end of the rotating shaft 11 passes through the sleeve 12 and is connected to one end of the first crank 13. One end of the sleeve 12 is connected to the outer wall of the motor 10, and the other end of the sleeve 12 is connected to one end of the support wall 14. The other end of the support wall 14 is connected to the end face of the internal gear 15. The other end of the first crank 13 is rotatably connected to the gear 16, which meshes with the internal gear 15. A slide bar 17 is provided on the first crank 13 and is slidably connected along its axial direction. One end of the slide bar 17 is vertically connected to the slide groove 18. The center of the gear 16 is connected to one end of the second crank 19. The other end of the second crank 19 is connected to the slide column 20, which can slide in the slide groove 18. A cleaning block 21 is provided on the slide bar 17, and the front end of the cleaning block 21 is conical.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for detecting internal corrosion of a steel pipe, characterized by comprising: Including car body (1);The car body (1) front end circumferential direction is provided with several ultrasonic probes (2);Car body (1) rear end is installed with driving element;Car body (1) is provided with the processor (4) of mutual electric connection, motor (3) and battery (6);The output shaft of motor (3) extends to the outside of car body (1) and is connected with driving element;The processor (4) is electrically connected with ultrasonic probe (2);Car body (1) one side is also provided with charging socket (7), for charging battery (6).

2. A device for detecting internal corrosion of a steel pipe according to claim 1, characterized by The car body (1) front end is installed with cleaning device;The cleaning device includes motor (10);The outer wall of motor (10) is fixedly connected with internal gear (15);The output shaft of motor (10) is connected with rotating shaft (11);The one side of rotating shaft (11) is connected with gear (16) through first crank (13);The gear (16) is engaged with internal gear (15);The first crank (13) is installed with cleaning block (21).

3. A device for detecting internal corrosion of a steel pipe according to claim 2, characterized by The cleaning block (21) is installed on the first crank (13) through slide bar (17);The slide bar (17) can slide along the axial direction of first crank (13);The one end of slide bar (17) is connected with sliding groove body (18) vertically;Sliding groove body (18) is provided with sliding column (20), and sliding column (20) can slide in sliding groove body (18);Sliding column (20) is connected with gear (16) through second crank (19).

4. A device for detecting internal corrosion of a steel pipe according to claim 2, characterized by The rotating shaft (11) is provided with sleeve (12);The sleeve (12) is fixedly connected with the outer wall of motor (10);The front end of cleaning block (21) is pointed cone.

5. A device for detecting internal corrosion of a steel pipe according to claim 4, wherein The sleeve (12) is provided with several support walls (14) circumferentially;One end of support wall (14) is connected with sleeve (12), and the other end is fixedly connected with the end face of internal gear (15).

6. A device for detecting internal corrosion of a steel pipe according to claim 1, wherein The charging socket (7) is installed with sealing baffle (8).

7. A device for detecting internal corrosion of a steel pipe according to claim 1, wherein The car body (1) is provided with buffer device circumferentially, for protecting car body (1).

8. A device for detecting internal corrosion of a steel pipe according to claim 8, characterized by The buffer device is elastic leather bowl (9).

9. The apparatus for detecting internal corrosion of a steel pipe according to claim 1, wherein The driving element is paddle (5).

10. A method of operating a device for detecting internal corrosion of a steel pipe according to any one of claims 1 to 9, characterized by, Including the following steps: Motor (3) drives car body (1) to move through driving element, and ultrasonic probe (2) carries out ultrasonic detection to the inner wall of steel pipeline, to find the inner wall corrosion site.

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