Creeping wave detection device for defects of inner wall of thick-wall pipe

Abstract

The invention discloses a creeping wave detection device for defects of the inner wall of a thick-wall pipe, and relates to the field of ultrasonic creeping wave detection equipment, the creeping wave detection device comprises a driving transmission seat and a motor seat arranged at the rear end of the driving transmission seat, a driving motor is arranged in the motor seat, and the left side and the right side of the driving transmission seat are connected with driving wheels through driving shafts; the self-cleaning detection anti-interference device is additionally arranged for the phased array creeping wave detection probe, the anti-interference transparent protective cover wraps the probe, contact of dirt such as oil dirt and rust in a pipeline is blocked, array element pollution and element damage are avoided, attenuation of a high-light-transmission material is small, and the anti-interference device has the advantages of being simple in structure, low in cost and high in reliability. A wind power self-cleaning mechanism of the device forms an annular airflow forward along a protective cover through a wind distribution ring and a wind spraying head, dripped dirt is blown away in time, a super-hydrophobic coating is matched for dual oil stain prevention, a filter cover is matched for preventing secondary pollution of air impurities, and the protection continuity is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of ultrasonic creep wave detection equipment, specifically relating to a creep wave detection device for defects in the inner wall of a thick-walled pipe. Background Technology

[0002] Thick-walled pipes, as core transportation and load-bearing components in petrochemical, energy, and power industries (such as crude oil pipelines and high-pressure boiler water-cooled wall tubes), are prone to defects such as cracks, corrosion pits, and scratches due to long-term exposure to media corrosion, pressure shocks, and temperature cycles. If these defects are not detected in time, they may lead to pipeline leaks, ruptures, and other safety accidents. Therefore, precise detection of internal wall defects is necessary through specialized testing equipment. The climbing wave detection device for thick-walled pipe internal wall defects is a specialized device developed to meet this need. Its core relies on the characteristics of climbing waves (ultrasonic waves with energy concentrated on the inner surface of the pipe wall), combined with phased array electronic scanning technology. This allows it to penetrate the thick-walled pipe material and focus on the inner wall area, enabling the location and quantitative detection of defects. Simultaneously, equipped with a drive mechanism, it can move the detection components autonomously within the pipeline, replacing the traditional manual handheld probe detection method, significantly improving detection efficiency and coverage. It is currently one of the mainstream technical solutions for detecting internal wall defects in thick-walled pipes. However, in practical applications, existing climbing wave detection devices for defects in the inner walls of thick-walled pipes are susceptible to interference from dirt and grime inside the pipes, leading to decreased detection accuracy. This is especially true in the petroleum and chemical industries, where thick-walled pipes often contain residual oil, rust particles, dust, and other contaminants. When the detection device moves inside the pipe, this dirt can drip from the inner wall and adhere to the surface of the climbing wave detection probe. If the dirt covers the probe array elements, it will hinder the transmission and reception of ultrasonic waves, resulting in signal attenuation or increased noise, which in turn can lead to missed defects and location errors. Some viscous oil may also seep into the probe, damaging electronic components and shortening the probe's lifespan. Summary of the Invention

[0003] The purpose of this invention is to provide a creeping wave detection device for defects in the inner wall of thick-walled pipes, in order to solve the problems mentioned in the background art. The phased array creeping wave detection probe of the existing thick-walled pipe creeping wave detection device is easily interfered with by dirt such as oil and rust inside the pipe. The dirt adhering to and covering the array elements will hinder ultrasonic transmission and reception, resulting in signal attenuation, defect missed detection deviation, and the sticky oil may also seep into and damage the elements.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a creeping wave detection device for defects in the inner wall of a thick-walled pipe, comprising a drive transmission base and a motor base disposed at the rear end of the drive transmission base. The motor base contains a drive motor, and drive wheels are connected to the left and right sides of the drive transmission base via drive shafts. The drive motor and the drive transmission base are in a transmission cooperation, which can drive the drive wheels to rotate clockwise and counterclockwise, thereby driving the device to move back and forth along the axial direction inside the thick-walled pipe. A probe fixing base is fixed to the front end of the drive transmission base via a base fixing flange, and a phased array electronic scanning creeping wave detection probe is disposed at the front end of the probe fixing base. The middle section annular inner wall and the front inner wall of the creeping wave detection probe are both equidistantly arranged with multiple independent array elements.

[0005] In one embodiment, the self-cleaning detection anti-interference device includes a wind-powered self-cleaning mechanism, an anti-interference transparent protective cover, and a base socket hole. The anti-interference transparent protective cover is fitted onto the outside of the phased array electronic scanning climbing wave detection probe, and a base socket hole is provided at the center of its rear end. The base socket hole is adapted to fit the circular outer wall of the probe fixing base. The wind-powered self-cleaning mechanism is connected to the outside of the rear end of the anti-interference transparent protective cover.

[0006] In one embodiment, the self-cleaning detection anti-interference device further includes a sealing sleeve, which is sandwiched between the base sleeve hole and the probe fixing base. The inner wall of the sealing sleeve is tightly fitted with the outer wall of the probe fixing base, and the outer wall of the sealing sleeve is tightly fitted with the inner wall of the base sleeve hole. The joint gaps between the three are sealed with waterproof sealant. A sealed cavity is formed between the inner wall of the anti-interference transparent protective cover and the outer wall of the phased array electronic scanning climbing wave detection probe. The sealed cavity is filled with coupling agent, and there are no air bubbles in the coupling agent.

[0007] In one embodiment, the distance between the circular inner wall of the anti-interference transparent protective cover and the circular outer wall of the phased array electronic scanning climbing wave detection probe, and the distance between the front inner wall of the anti-interference transparent protective cover and the front outer wall of the climbing wave detection probe are all equal. The anti-interference transparent protective cover is made of high light transmittance polyphenylene ether in one piece, and its outer wall is coated with a superhydrophobic coating.

[0008] In one embodiment, the wind-powered self-cleaning mechanism includes a wind distribution ring, a nozzle, a fixing sleeve, and an annular air collecting pipe. The wind distribution ring is coaxially sleeved and fixed to the outer rear end of the anti-interference transparent protective cover. The annular air collecting pipe is pasted and fixed to the rear end of the wind distribution ring, and the annular air collecting pipe is coaxially arranged with the wind distribution ring. Multiple fixing sleeves are equally spaced on the annular inner wall of the wind distribution ring. A nozzle is inserted and fixed in each fixing sleeve. The rear end of all nozzles is connected to the inside of the annular air collecting pipe, and the air outlet of the nozzle is aligned with the axial direction of the anti-interference transparent protective cover, that is, blowing air forward along the outer wall of the protective cover.

[0009] In one embodiment, the self-cleaning detection anti-interference device further includes two symmetrically arranged protective cover reinforcement brackets. Both protective cover reinforcement brackets extend longitudinally backward, with their front ends welded to the upper and lower ends of the air distribution ring, and their rear ends fixedly connected to the upper and lower ends of the drive transmission seat by screws. After the anti-interference transparent protective cover is initially fixed to the sealing sleeve through the base sleeve hole, the protective cover reinforcement bracket applies a radial fixing force to the anti-interference transparent protective cover through the air distribution ring to prevent vibration during device movement from causing sealing gaps between the sealing sleeve and the base sleeve hole and the probe fixing base.

[0010] In one embodiment, the wind-powered self-cleaning mechanism further includes a metal connecting duct, a semi-circular air distribution duct, and metal fixing heads. The semi-circular air distribution duct is arranged parallel to the rear side of the annular air collecting duct, and the opening of the semi-circular air distribution duct faces the annular air collecting duct. Both ends of the semi-circular air distribution duct are fixedly connected to the rear end of the annular air collecting duct through the metal connecting duct, and the semi-circular air distribution duct communicates with the interior of the annular air collecting duct through the metal connecting duct. Multiple metal fixing heads are provided, evenly distributed between the semi-circular air distribution duct and the annular air collecting duct, and both ends of the metal fixing heads are fixedly connected to the semi-circular air distribution duct and the annular air collecting duct respectively to reinforce both.

[0011] In one embodiment, the wind-powered self-cleaning mechanism further includes a small blower, an air outlet, and an air supply pipe. The small blower is fixed to the top of the front end of the drive transmission seat by a flange and screws. The small blower is electrically connected to the motor seat. The front end of the small blower is provided with an air outlet. The top end of the semi-circular air distribution pipe is connected to the air supply pipe. The end of the air supply pipe away from the semi-circular air distribution pipe is sealed to the air outlet through a sealing connection sleeve.

[0012] In one embodiment, the wind-powered self-cleaning mechanism further includes an air inlet and a filter cover. The rear end of the small blower is provided with an air inlet, and the filter cover is fitted and fixed to the opening of the air inlet to filter dust and impurities in the air entering the air inlet.

[0013] In one embodiment, the phased array electronic scanning creep wave detection probe is electrically connected to the motor base via a probe fixing base and a cable. The rear center of the motor base is provided with a cable connector for connecting to an external cable. Both sides of the cable connector are provided with cable connectors for connecting to an external cable. When the device is powered off or malfunctions, it can be pulled away from the thick-walled pipe by an external cable.

[0014] In one embodiment, a lighting fixture is fixed to the top of the drive transmission seat via a flange and screws. The lighting fixture is electrically connected to the motor seat. Lighting windows are provided at both ends of the lighting fixture. A light board with multiple LED beads is fixed to each lighting window via screws. An acrylic protective sheet is sealed and fixed at the opening of the lighting window. A camera mounting bracket is provided on the rear side of the lighting fixture. The camera mounting bracket is used to fix a monitoring camera for detection via screws.

[0015] Compared with the prior art, the present invention provides a wave-creep detection device for defects in the inner wall of thick-walled pipes, which has the following advantages: This invention adds a self-cleaning detection and anti-interference device to the exterior of a phased array electronic scanning creeping wave detection probe used for detecting defects in the inner wall of thick-walled pipes. This device primarily utilizes an anti-interference transparent protective cover to provide core protection and anti-interference for the probe. When the creeping wave detection device moves within the thick-walled pipe, oil, rust particles, dust, and other contaminants from the pipe's inner wall can easily drip down. The anti-interference transparent protective cover completely encloses the creeping wave detection probe, directly preventing contaminants from contacting the probe's outer wall and avoiding contaminants covering the probe elements or seeping into the probe's interior, thus preventing ultrasonic interference caused by element contamination. The reduced wave transmission and reception efficiency ensures the probe remains in a clean working state. Meanwhile, the anti-interference transparent protective cover is made of a single piece of high-transmittance material, which has minimal attenuation of the ultrasonic signal in the detection frequency band. The uniform distance between the protective cover and the outer wall of the probe, with the gap filled with bubble-free coupling agent, eliminates the reflection interference of the air layer on the sound waves, ensuring that the creeping wave signal can efficiently penetrate the protective cover and enter the tube wall, avoiding missed defects or positioning deviations, and further ensuring detection accuracy. The superhydrophobic coating on the outer wall of the protective cover can also reduce the adhesion of dirt and reduce the amount of dirt left, making subsequent cleaning easier. On top of the basic protection of the anti-interference transparent protective cover, the wind-powered self-cleaning mechanism equipped with the self-cleaning detection anti-interference device can further enhance the continuity of protection. The air distribution ring of the wind-powered self-cleaning mechanism is coaxially sleeved at the rear end of the protective cover. The annular air collection pipe is connected to the air distribution ring. Multiple nozzles are equidistantly distributed along the air distribution ring and blow air forward along the axial direction of the protective cover. When the small blower is started, the filtered clean air is delivered to each nozzle through the pipeline, forming an annular airflow forward along the outer wall of the protective cover. This can promptly blow away the dirt that has just dripped off, preventing dirt from accumulating at the front end of the protective cover. Especially in pipeline scenarios with high oil content, the airflow can work with the superhydrophobic coating on the outer wall of the protective cover to doubly prevent oil from adhering, ensuring that the protective cover is always transparent and does not affect the penetration of the creep wave signal and the detection field of view. In addition, the filter cover at the air inlet of the blower can filter impurities in the air, prevent secondary pollution, and ensure stable cleaning effect. Furthermore, the structural design of the self-cleaning detection anti-interference device enhances overall protection stability. The protective cover is connected to the probe fixing base through the base sleeve hole, with a sealing sleeve between them and waterproof sealant to prevent coupling agent leakage and ensure stable acoustic wave transmission. At the same time, two symmetrical protective cover reinforcement brackets fix the air distribution ring and drive transmission seat, providing radial fixing force for the protective cover and preventing displacement of the protective cover or gaps in the sealing sleeve due to vibration during device movement. This further ensures the sealing effect of the coupling agent and the protection accuracy of the protective cover. In summary, through the triple synergy of physical protection of the protective cover, active cleaning by the wind mechanism, and reinforcement and sealing stability, this device can effectively block the interference and damage of pipeline dirt to the probe, while ensuring stable transmission and detection accuracy of the creeping wave signal. It is suitable for the complex detection environment inside thick-walled pipes, significantly reduces probe maintenance costs, and improves the long-term working reliability and detection efficiency of the creeping wave detection device. Attached Figure Description

[0016] Figure 1 This is a rear-view three-dimensional structural diagram of the integrated wave-creep detection device for thick-walled pipe inner wall defects and the self-cleaning detection and anti-interference device of the present invention.

[0017] Figure 2 This is a front-view three-dimensional structural diagram of the integrated wave-creep detection device for thick-walled pipe inner wall defects and the self-cleaning detection and anti-interference device of the present invention.

[0018] Figure 3 This is a top-view planar structural diagram of the integrated wave-creep detection device for thick-walled pipe inner wall defects and the self-cleaning detection and anti-interference device of the present invention.

[0019] Figure 4 This is a rear-view three-dimensional structural diagram of the wave-creep detection device for defects on the inner wall of a thick-walled pipe after the removal of the self-cleaning detection anti-interference device of the present invention.

[0020] Figure 5 This is a front-view three-dimensional structural diagram of the wave-creep detection device for defects on the inner wall of a thick-walled pipe after the removal of the self-cleaning detection anti-interference device of the present invention.

[0021] Figure 6 This is a rear-view perspective view of the self-cleaning detection and anti-interference device of the present invention in the installation and use state.

[0022] Figure 7 This is a front-view perspective three-dimensional structural diagram of the self-cleaning detection and anti-interference device of the present invention in the installation and use state.

[0023] Figure 8 This is a top-view planar structural diagram of the self-cleaning detection and anti-interference device of the present invention in its installed and used state.

[0024] Figure 9This is a rear-view three-dimensional structural diagram of the self-cleaning detection and anti-interference device of the present invention in a disassembled state.

[0025] Figure 10 This is a front-view three-dimensional structural diagram of the self-cleaning detection and anti-interference device of the present invention in a disassembled state.

[0026] In the diagram: 1. Cable connector; 2. Motor mount; 3. Drive wheel; 4. Drive transmission mount; 5. Cable connector; 6. Camera mounting base; 7. Lighting fixture; 8. Lighting window; 9. Self-cleaning detection anti-interference device; 10. Probe mounting base; 11. Phased array electronic scanning creeping wave detection probe; 12. Base mounting flange; 13. Wind-powered self-cleaning mechanism; 14. Anti-interference transparent protective cover; 15. Protective cover reinforcement bracket; 16. Small blower; 17. Air outlet; 18. Air supply duct; 19. Air distribution ring; 20. Air nozzle; 21. Fixing sleeve hole; 22. Metal connecting duct; 23. Semi-circular air distribution duct; 24. Air inlet; 25. Filter cover; 26. Metal fixing head; 27. Annular air collection duct; 28. Sealing sleeve; 29. ​​Base sleeve hole. Detailed Implementation

[0027] 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.

[0028] This invention provides, for example Figure 1-10 This device, shown, is a creeping wave detection device for defects in the inner wall of thick-walled pipes. It aims to achieve accurate detection of defects in the inner wall of thick-walled pipes (such as petrochemical pipelines and high-pressure boiler pipelines). A drive mechanism propels the detection components autonomously within the pipe. Defect detection is achieved using a phased array electronic scanning creeping wave detection probe 11, and a self-cleaning detection anti-interference device 9 ensures detection stability. It also includes lighting and emergency dragging functions, making it suitable for complex internal pipeline inspection environments. Its core components include a drive transmission base 4, a motor base 2, a phased array electronic scanning creeping wave detection probe 11, and a self-cleaning... The device includes an anti-interference device 9, a lighting fixture 7, and an emergency drag structure. Specifically, the drive transmission seat 4 is the core load-bearing frame of the device, with a motor seat 2 fixedly installed at its rear end. The motor seat 2 has a built-in drive motor. Drive wheels 3 are rotatably connected to the left and right sides of the drive transmission seat 4 via drive shafts. The output end of the drive motor is connected to the gear transmission assembly inside the drive transmission seat 4. A cable connector 1 is provided at the center of the rear end of the motor seat 2 for connecting to external cables to transmit power and test data. Cable connectors 5 are symmetrically provided on both sides of the cable connector 1 for connecting external cables.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, when the device needs to move inside a thick-walled pipe, the external cable supplies power to the drive motor in the motor base 2 through the cable connector 1. After the drive motor starts, its output torque is transmitted to the drive shafts on both sides through the gear transmission assembly inside the drive transmission base 4, causing the drive wheel 3 to rotate clockwise and counterclockwise. When the drive wheel 3 rotates, it generates friction with the inner wall of the pipe, thereby pushing the entire device to move back and forth along the pipe axis to meet the detection requirements of different pipe sections. If the device experiences a power outage or malfunction inside the pipe and cannot move autonomously, the operator can pull the cable connector 5 through the external cable to directly drag the device from inside the pipe to the outside, avoiding the device from being stuck inside the pipe and causing blockage or damage, thus improving the safety of use.

[0030] Furthermore, a probe mounting base 10 is detachably fixed to the front end of the drive transmission base 4 via a base fixing flange 12. The front end of the probe mounting base 10 is electrically connected to a phased array electronic scanning creeping wave detection probe 11, and the creeping wave detection probe is electrically connected to the motor base 2 via the probe mounting base 10 and internal cables to achieve power supply and signal transmission. The middle section annular inner wall and the front inner wall of the creeping wave detection probe are both equidistantly arranged with multiple independent array elements along the circumference. Each array element can independently emit and receive ultrasonic waves. During detection, the motor base 2 supplies power to each independent array element of the creeping wave detection probe via cables. The data processing unit, integrated inside the motor base 2, precisely adjusts the ultrasonic wave emission timing and phase of each array element. When the control array elements are sequentially delayed in a clockwise or counterclockwise order, the ultrasonic waves emitted by each element superimpose in space, forming a creeping wave that propagates along the inner wall of the pipe. The energy is concentrated on the inner surface of the pipe wall, avoiding the attenuation effect of the thick wall material on the sound waves. During the propagation of the creeping wave along the inner wall of the thick-walled pipe, if it encounters an inner wall defect (such as cracks, corrosion pits, or scratches), some of the sound waves will be reflected. The reflected signal is received by the array element of the creeping wave detection probe, converted into an electrical signal, and transmitted to the data processing unit. By analyzing parameters such as the amplitude and propagation time of the reflected signal, the data processing unit can accurately determine the location, depth, and length of the defect, and finally generate a defect detection report, realizing the detection of defects on the inner wall of the thick-walled pipe without blind spots.

[0031] Furthermore, an illumination lamp holder 7 is fixed to the top of the drive transmission base 4 via a flange and screws. The illumination lamp holder 7 is electrically connected to the motor base 2. Illumination windows 8 are provided at both ends of the lamp holder 7. A lamp board with multiple LED beads is fixed inside the window via screws. An acrylic protective sheet is sealed and fixed at the opening of the window. A camera mounting base 6 is provided on the rear side of the illumination lamp holder 7. A monitoring camera for detection can be fixed by screws. When the device is detecting in a dimly lit pipe, the motor base 2 supplies power to the illumination lamp holder 7, the LED beads are lit, and the light shines through the acrylic protective sheet of the illumination window 8 onto the inner wall of the pipe, providing sufficient illumination for the detection area of ​​the climbing wave detection probe. At the same time, it is convenient for the monitoring camera to be added later to capture the internal condition of the pipe in real time, assisting the operator to observe the working status of the device and the environment inside the pipe, improving the visibility of the detection process. The acrylic protective sheet can protect the lamp board from dirt and grime inside the pipe and extend the service life of the lighting components.

[0032] like Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, to prevent dirt on the inner wall of the pipeline from affecting the working accuracy of the creeping wave detection probe, a self-cleaning detection anti-interference device 9 is fitted around the outside of the creeping wave detection probe. This device first provides basic protection through an anti-interference transparent protective cover 14. The anti-interference transparent protective cover 14 is made of high-transmittance polyphenylene ether in one piece, which can completely cover the creeping wave detection probe. A base socket hole 29 is opened at the center of its rear end. The base socket hole 29 is fitted to the circular outer wall of the probe fixing base 10. A sealing sleeve 28 is sandwiched between the base socket hole 29 and the probe fixing base 10. The inner wall of the sealing sleeve 28 is in close contact with the outer wall of the probe fixing base 10, and the outer wall of the sealing sleeve 28 is in close contact with the inner wall of the base socket hole 29. The gaps between the three are sealed with waterproof sealant to form a sealed space. The distance between the inner wall of the anti-interference transparent protective cover 14 and the outer wall of the creeping wave detection probe is uniform, that is, the distance between the circular inner walls is the same as the distance between the front inner walls. The sealed space is filled with a bubble-free coupling agent, and the outer wall of the protective cover is also coated with a superhydrophobic coating.

[0033] Furthermore, when the device moves and detects inside the pipeline, dirt such as oil, rust particles, and dust on the inner wall of the pipeline is easily dripped off by gravity. The anti-interference transparent protective cover 14 can directly block the dirt from contacting the outer wall of the climbing wave detection probe, preventing dirt from covering the array elements or seeping into the probe, thus preventing the reduction of ultrasonic transceiver efficiency caused by array element contamination. The high light transmittance material ensures that the climbing wave signal has no significant attenuation when it penetrates. The uniform spacing and bubble-free coupling agent can eliminate the reflection interference of the air layer on the sound wave, ensuring detection accuracy. The superhydrophobic coating can reduce the adhesion of oil, water stains and the surface of the protective cover, reduce dirt retention, and reduce the burden of subsequent cleaning.

[0034] Furthermore, to further enhance the continuity of protection, the self-cleaning detection and anti-interference device 9 is also equipped with a wind-powered self-cleaning mechanism 13, which works in conjunction with the anti-interference transparent protective cover 14 to achieve the dual effects of physical protection and active cleaning. The wind-powered self-cleaning mechanism 13 includes a wind distribution ring 19, a blower head 20, an annular air collecting pipe 27, a semi-circular wind distribution pipe 23, a metal connecting air pipe 22, a small blower 16, and a filter cover 25. The wind distribution ring 19 is coaxially sleeved and fixed to the outer rear end of the anti-interference transparent protective cover 14. The annular air collecting pipe 27 with a coaxial axis is pasted and fixed to the rear end of the wind distribution ring 19. The semi-circular wind distribution pipe 23 is arranged parallel to the rear side of the annular air collecting pipe 27, and its opening faces the annular ring. The air collecting duct 27 and the semi-circular air distribution duct 23 are fixedly connected to the rear end of the annular air collecting duct 27 by metal connecting ducts 22 and are internally connected. The two are reinforced by multiple metal fixing heads 26. The small blower 16 is fixed to the top of the front end of the drive transmission seat 4 by flange and screws. Its front end is provided with an air outlet 17, which is sealed to the top end of the semi-circular air distribution duct 23 by air supply duct 18 (with sealing connecting sleeve). The rear end of the small blower 16 is provided with an air inlet 24. A filter cover 25 is sleeved at the opening of the air inlet 24. The upper and lower ends of the air distribution ring 19 are symmetrically welded with longitudinally extending rearward protective cover reinforcement brackets 15. The rear end of the bracket is fixed to the drive transmission seat 4 by screws.

[0035] Furthermore, the small blower 16 is electrically connected to the motor base 2 and starts synchronously during testing. External air enters through the air inlet 24, and the filter cover 25 filters dust and impurities in the air, preventing impurities from entering subsequent pipelines with the airflow. After being pressurized by the blower, the clean air is delivered to the semi-circular air distribution duct 23 through the air outlet 17 and the air supply duct 18, and then distributed to the annular air collecting duct 27 through the metal connecting duct 22. The air in the annular air collecting duct 27 is evenly distributed to multiple nozzles 20 on the inner wall of the air distribution ring 19. The nozzles 20 are fixed to the air distribution ring 19 through the fixing sleeve hole 21. The air outlet 17 faces the same direction as the axis of the protective cover, and finally flows along the anti-drying... The transparent protective cover 14 sprays forward from its outer wall, forming a ring-shaped airflow. This airflow can promptly blow away dirt that has just dripped onto the outer wall of the protective cover, preventing dirt from accumulating at the front of the protective cover, which is close to the detection area. Combined with the superhydrophobic coating on the outer wall of the protective cover, it can doubly prevent oil stains from adhering, ensuring that the protective cover always remains transparent and does not affect the penetration of the creeping wave signal and the detection field of view. At the same time, the protective cover reinforcement bracket 15 can apply radial fixing force to the protective cover through the air distribution ring 19, preventing the vibration of the device during movement from causing gaps between the sealing sleeve 28 and the base sleeve hole 29 and the probe fixing base 10, avoiding coupling agent leakage, and further ensuring detection stability.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is 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 thick-walled pipe wall defect creeping wave detection device, comprising a drive transmission seat (4) and a motor seat (2) arranged at the rear end of the drive transmission seat (4), wherein a drive motor is arranged inside the motor seat (2), drive wheels (3) are connected to the left and right sides of the drive transmission seat (4) through drive shafts, the drive motor is in transmission cooperation with the drive transmission seat (4), and the drive wheels (3) can be driven to rotate clockwise and counterclockwise to drive the device to move forward and backward along the axial direction in the thick-walled pipe, a probe fixing base (10) is fixed to the front end of the drive transmission seat (4) through a base fixing flange (12), a phased array electronic scanning creeping wave detection probe (11) is arranged at the front end of the probe fixing base (10), and a plurality of independent elements are arranged at equal intervals on the annular inner wall and the front end inner wall of the middle section of the creeping wave detection probe. characterized in that The self-cleaning detection anti-interference device (9) comprises a wind power self-cleaning mechanism (13), an anti-interference transparent protective cover (14) and a base sleeve hole (29), the anti-interference transparent protective cover (14) is sleeved outside the phased array electronic scanning creeping wave detection probe (11), a base sleeve hole (29) is formed in the rear end center of the anti-interference transparent protective cover (14), the base sleeve hole (29) is adaptively sleeved with the circular outer wall of the probe fixing base (10), and the wind power self-cleaning mechanism (13) is connected to the rear end outside of the anti-interference transparent protective cover (14).

2. A creeping wave inspection apparatus for inspecting the inner wall of a thick-walled pipe according to claim 1, characterized by: The self-cleaning detection anti-interference device (9) further comprises a sealing sleeve (28), which is clamped between the base sleeve hole (29) and the probe fixing base (10), the inner wall of the sealing sleeve (28) is tightly attached to the outer wall of the probe fixing base (10), the outer wall of the sealing sleeve (28) is tightly attached to the inner wall of the base sleeve hole (29), and the connecting gaps of the three are sealed by waterproof sealant, a sealed cavity is formed between the inner wall of the anti-interference transparent protective cover (14) and the outer wall of the phased array electronic scanning creeping wave detection probe (11), the sealed cavity is filled with a coupling agent, and there is no air bubble in the coupling agent.

3. A creeping wave inspection apparatus for inspecting the interior wall of a thick-walled pipe according to claim 2, characterized by: The distance between the circular inner wall of the anti-interference transparent protective cover (14) and the circular outer wall of the phased array electronic scanning creeping wave detection probe (11) and the distance between the front end inner wall of the anti-interference transparent protective cover (14) and the front end outer wall of the creeping wave detection probe (11) are equal, the anti-interference transparent protective cover (14) is integrally formed by high-transmittance polyphenyl ether, and the outer wall is coated with a super-hydrophobic coating.

4. A creeping wave inspection apparatus for inspecting the interior wall of a thick-walled pipe according to claim 3, characterized by: The wind force self-cleaning mechanism (13) comprises a wind distribution ring (19), a wind spraying head (20), a fixed sleeve hole (21) and an annular wind collecting pipe (27), the wind distribution ring (19) is coaxially sleeved and fixed to the rear end of the anti-interference transparent protective cover (14), the annular wind collecting pipe (27) is fixedly attached to the rear end of the wind distribution ring (19), and the annular wind collecting pipe (27) is coaxially arranged with the wind distribution ring (19), a plurality of fixed sleeve holes (21) are equidistantly formed in the annular inner wall of the wind distribution ring (19), each fixed sleeve hole (21) is inserted and fixed with a wind spraying head (20), the rear end of all the wind spraying heads (20) is communicated with the inside of the annular wind collecting pipe (27), and the air outlet of the wind spraying head (20) is directed in the same direction as the axis of the anti-interference transparent protective cover (14), that is, the air is blown forward along the outer wall of the protective cover.

5. A creeping wave inspection apparatus for inspecting the interior wall of a thick-walled pipe according to claim 4, characterized by: The self-cleaning detection anti-interference device (9) further comprises two symmetrically arranged protective cover reinforcing supports (15), the two protective cover reinforcing supports (15) are longitudinally extended rearward, the front ends of the two protective cover reinforcing supports (15) are respectively welded to the upper and lower ends of the wind distribution ring (19), and the rear ends of the two protective cover reinforcing supports (15) are fixedly connected with the upper and lower ends of the driving transmission seat (4), after the anti-interference transparent protective cover (14) is preliminarily fixed by the base sleeve hole (29) and the sealing sleeve (28), the protective cover reinforcing supports (15) apply a radial fixing force to the anti-interference transparent protective cover (14) through the wind distribution ring (19), so as to prevent the sealing gap between the sealing sleeve (28), the base sleeve hole (29) and the probe fixing base (10) from being caused by vibration during movement of the device.

6. A creeping wave inspection apparatus for inspecting the interior wall of a thick-walled pipe according to claim 5, characterized by: The wind force self-cleaning mechanism (13) further comprises a metal connecting air pipe (22), a semicircular air distribution pipe (23) and a metal fixing head (26), the semicircular air distribution pipe (23) is arranged in parallel at the rear side of the annular wind collecting pipe (27), and the opening of the semicircular air distribution pipe (23) is directed to the annular wind collecting pipe (27), the two ends of the semicircular air distribution pipe (23) are fixedly connected with the rear end of the annular wind collecting pipe (27) through the metal connecting air pipe (22), and the semicircular air distribution pipe (23) is communicated with the inside of the annular wind collecting pipe (27) through the metal connecting air pipe (22), the metal fixing head (26) is arranged in plurality and is uniformly arranged between the semicircular air distribution pipe (23) and the annular wind collecting pipe (27), and the two ends of the metal fixing head (26) are fixedly connected with the semicircular air distribution pipe (23) and the annular wind collecting pipe (27) respectively, so as to reinforce the two.

7. A creeping wave inspection apparatus for inspecting the interior of a thick walled pipe according to claim 6, wherein: The wind force self-cleaning mechanism (13) further comprises a small air blower (16), an air outlet (17) and an air supply pipe (18), the small air blower (16) is fixedly arranged at the top of the front end of the driving transmission seat (4) through a flange and screws, the small air blower (16) is electrically connected with the motor base (2), the front end of the small air blower (16) is provided with the air outlet (17), the top end of the semicircular air distribution pipe (23) is connected with the air supply pipe (18), and one end of the air supply pipe (18) away from the semicircular air distribution pipe (23) is sealingly connected with the air outlet (17) through a sealing connection sleeve.

8. A creeping wave inspection apparatus for inspecting the interior of a thick walled pipe according to claim 7, wherein: The wind force self-cleaning mechanism (13) further comprises an air inlet (24) and a filter cover (25), the rear end of the small air blower (16) is provided with the air inlet (24), and the filter cover (25) is sleeved and fixed at the opening of the air inlet (24) and is used for filtering dust impurities in the air entering the air inlet (24).

9. The apparatus for thick wall pipe inner wall defect creeping wave detection according to claim 1, characterized in that: The phased array electronic scanning type creeping wave detection probe (11) is electrically connected with the motor seat (2) through the probe fixing base (10) and a cable, the rear end center of the motor seat (2) is provided with a cable connector (1), the cable connector (1) is used for connecting with an external cable, both sides of the cable connector (1) are provided with cable rope connectors (5), the cable rope connectors (5) are used for connecting with external cable ropes, and when the device is powered off or fails, the device can be dragged away from the thick-walled pipeline through the external cable ropes.

10. A creeping wave inspection apparatus for inspecting the interior wall of a thick-walled pipe according to claim 9, characterized by: The top end of the driving transmission seat (4) is provided with a lighting lamp holder (7) through a flange and a screw, the lighting lamp holder (7) is electrically connected with the motor seat (2), lighting window (8) is arranged at the left and right ends of the lighting lamp holder (7), a lamp plate with a plurality of LED lamp beads is arranged in each lighting window (8) through a screw, an acrylic protective sheet is sealingly fixed at the opening of the lighting window (8), and a camera reserved mounting seat (6) is arranged at the rear side of the lighting lamp holder (7), the camera reserved mounting seat (6) is used for fixing a monitoring camera for detection through a screw.

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