A device and method for detecting hidden defects of a buried pipeline

Abstract

The application relates to a buried pipeline hidden defect detection device and a detection method, and belongs to the field of pipeline detection. The device comprises a rack, a supporting travel mechanism, an ultrasonic detection mechanism and a cleaning mechanism. The supporting travel mechanism is arranged on the rack and is used for driving the rack to travel along the axis of the pipeline in the pipeline. The ultrasonic detection mechanism is arranged on the rack and is used for detecting defects of the pipeline through sound waves. The ultrasonic detection mechanism comprises a host computer, a probe and a coupling capsule. The host computer is arranged on the rack. A plurality of probes are circumferentially arranged on the rack. The plurality of probes are electrically connected with the host computer. The coupling capsule is arranged between the probe and the inner wall of the pipeline. The cleaning mechanism is arranged on the rack and is used for cleaning the inner wall of the pipeline. The application has the effects of improving the sound wave coupling effect, improving the accuracy of detection and defect positioning, and effectively improving the precision of hidden defect detection of the buried pipeline.

Description

Technical Field

[0001] This application relates to the field of pipeline inspection, and in particular to a device and method for detecting hidden defects in buried pipelines. Background Technology

[0002] Buried pipelines, as a core component of urban infrastructure, are widely used in fields such as gas, water supply, drainage, and petrochemicals. However, buried pipelines are constantly surrounded by soil and are susceptible to hidden defects such as internal cavities, delamination, and micro-cracks due to factors such as geological subsidence, soil corrosion, and material aging. These defects are difficult to detect during routine inspections, and once they accumulate to a certain extent, they can easily lead to major safety accidents such as pipeline leaks and ruptures.

[0003] Currently, buried pipeline defect detection mainly employs technologies such as ground-penetrating radar (GPR) and ultrasonic testing. However, GPR is susceptible to interference from underground pipeline intersections and uneven soil conditions, resulting in limited detection accuracy. Ultrasonic testing, which requires penetrating the soil, is also significantly affected by the soil medium, exhibiting poor acoustic coupling and low defect location accuracy. Therefore, how to achieve high-precision hidden defect detection for buried pipelines is a pressing issue that needs to be addressed. Summary of the Invention

[0004] To improve the accuracy of detecting hidden defects in buried pipelines, this application provides a device and method for detecting hidden defects in buried pipelines.

[0005] This application provides a buried pipeline hidden defect detection device with the following technical solution: A buried pipeline hidden defect detection device includes a frame, a support and travel mechanism, an ultrasonic detection mechanism, and a cleaning mechanism. The support and travel mechanism is mounted on the frame and is used to drive the frame to travel along the axis of the pipeline inside the pipeline. The ultrasonic detection mechanism is mounted on the frame and is used to detect pipeline defects by sound waves. The ultrasonic detection mechanism includes a main unit, a probe, and a coupling capsule. The main unit is mounted on the frame, and multiple probes are circumferentially arranged around the frame. All probes are electrically connected to the main unit. The coupling capsule is disposed between the probe and the inner wall of the pipeline. The cleaning mechanism is mounted on the frame and is used to clean the inner wall of the pipeline.

[0006] By adopting the above technical solution, the frame is placed in the pipeline, and the supporting traveling mechanism drives the frame to move along the pipeline axis inside the pipeline. The cleaning mechanism first cleans the inner wall of the pipeline, and then drives the coupling capsule to fill between multiple probes and the inner wall of the pipeline. Multiple probes emit high-frequency acoustic pulses, which are propagated to the pipeline through the coupling capsule. After being reflected, the high-frequency acoustic pulses are received by the probes. The host can identify pipeline defects through the echo signal. By using the coupling capsule from inside the pipeline to couple the probes with the pipeline, the acoustic coupling effect is improved, thereby improving the accuracy of detection and defect location, and effectively improving the accuracy of hidden defect detection in buried pipelines.

[0007] Optionally, the multiple probes are slidably mounted on the frame in an axial direction toward the frame. The frame is provided with an adjustment assembly for driving the multiple probes to move toward the frame. The coupling capsule is circumferentially fitted on the side of the multiple probes away from the frame, and the diameter of the coupling capsule is expandable.

[0008] By adopting the above technical solution, during the movement of the frame inside the pipeline, the adjustment component drives multiple probes to move towards the frame. The multiple probes cause the coupling bladder to contract, facilitating the movement of the frame inside the pipeline. When the pipeline needs to be inspected, the adjustment component then drives multiple probes to move away from the frame. The multiple probes cause the coupling bladder to expand and abut against the inner wall of the pipeline, thus meeting the needs of inspecting pipelines of different diameters.

[0009] Optionally, the adjustment assembly includes an adjustment arm, an adjustment ring, and a control component. Multiple adjustment arms are hinged on the frame, and each adjustment arm is connected to a probe. The adjustment ring is slidably disposed on the frame between the multiple adjustment arms along the axial direction of the frame. The adjustment ring is slidably connected to the multiple adjustment arms. The control component is disposed on the frame and is used to drive the adjustment ring to slide.

[0010] By adopting the above technical solution, the control component drives the adjustment ring to slide between multiple adjustment arms. The adjustment ring can pull the multiple adjustment arms to rotate closer to each other and retract, or drive the multiple adjustment arms to rotate away from each other and expand. The adjustment arms can then drive the multiple probes to move closer to each other or further away, thus conveniently controlling the retraction or expansion of the multiple probes.

[0011] Optionally, the coupling capsule includes a filling section, a corrugated section, and a reservoir assembly. The filling section is disposed on the probe, the corrugated section is disposed between adjacent filling sections, and the reservoir assembly is disposed on the frame and is used to input coupling fluid into the filling section and the corrugated section.

[0012] By adopting the above technical solution, during the deployment of multiple probes, the corrugated section unfolds between adjacent filling sections, and the liquid storage component inputs the coupling fluid into the filling section and the corrugated section, thereby increasing the diameter of the coupling capsule and making it fit against the inner wall of the pipe; during the retraction of multiple probes, as the probes drive the filling section to move, the filling section squeezes the corrugated section, and the coupling fluid is squeezed into the liquid storage component, which can reduce the diameter of the coupling capsule to adapt to the retraction of the probes and improve the applicability of the coupling capsule to different diameter requirements.

[0013] Optionally, the liquid storage assembly includes a liquid storage tank, a piston, and a linkage rod. The liquid storage tank is mounted on the frame and communicates with the filling section. The piston is slidably mounted on the liquid storage tank. The linkage rod is mounted on the piston and connected to an adjusting ring. When the adjusting ring drives multiple adjusting arms to open, the linkage rod drives the piston to move toward the communication side between the liquid storage tank and the filling section.

[0014] By adopting the above technical solution, when the adjusting ring drives the adjusting arm to open, the linkage rod drives the piston to move towards the communication side between the liquid storage tank and the filling section. The piston can then squeeze the coupling liquid in the liquid storage tank into the filling section, filling the increased diameter filling section and corrugated section. When the adjusting ring drives the multiple adjusting arms to close, the linkage rod drives the piston to move away from the communication side between the liquid storage tank and the filling section, so that the coupling liquid in the filling section and corrugated section can be squeezed into the liquid storage tank as the diameter decreases, thus conveniently realizing the supply and extrusion of the coupling liquid in the filling section and corrugated section.

[0015] Optionally, the cleaning mechanism includes multiple cleaning shovels, which are distributed circumferentially and axially along the frame, with adjacent cleaning shovels staggered at the ends furthest from the frame.

[0016] By adopting the above technical solution, during the process of the frame moving inside the pipe, multiple cleaning shovels at the ends of adjacent cleaning shovels away from the frame can cover the inner wall of the pipe circumferentially, thereby effectively cleaning the inner wall of the pipe.

[0017] Optionally, the cleaning shovel includes a support base, a sliding member, support rods, and a shovel blade. The support base is slidably mounted on the frame along the radial direction of the frame. The sliding member is mounted on the frame and is used to drive the support base to slide. Multiple support rods are mounted on the support base and are telescopic. The shovel blade is mounted on multiple support rods and is deformable.

[0018] By adopting the above technical solution, the sliding component drives the support base to slide radially toward the frame. The support base drives multiple support rods to move, and the multiple support rods can drive the shovel blade to move. The distance of the shovel blade extending out of the frame can be adjusted. Furthermore, by adjusting the extension and retraction lengths of different support rods on the support base, the shovel blade can be deformed, allowing the curvature of the shovel blade to adapt to different pipe diameters, thereby improving the applicability of the shovel blade for cleaning pipes of different diameters.

[0019] Optionally, the frame is provided with a collection assembly for removing impurities from the inner bottom wall of the pipe. The collection assembly includes a roller brush, a drive unit, a collection box, and an adsorption unit. The roller brush is rotatably mounted on the frame, and the bristles of the roller brush abut against the inner bottom wall of the pipe. The drive unit is mounted on the frame and is used to drive the roller brush to rotate. The collection box is mounted on the frame, and the adsorption unit is mounted on the roller brush and is used to adsorb impurities into the collection box.

[0020] By adopting the above technical solution, during the process of the frame moving inside the pipe, the cleaning shovel first removes the shoveled impurities, and then the drive component drives the roller brush to rotate. The brush bristles lift up the remaining smaller impurities on the bottom wall of the pipe, and the adsorption component sucks the smaller impurities on the bottom wall of the pipe into the collection box, effectively improving the cleaning effect of the pipe.

[0021] Optionally, the supporting travel mechanism includes at least two sets of supporting wheel sets, which are respectively arranged at both ends of the frame axial direction. Each set of supporting wheel sets includes at least three supporting arms and a traveling wheel. The three supporting arms are arranged at intervals along the circumference of the frame. The length of the supporting arms is telescopic. The traveling wheel is arranged on the supporting arm. One of the supporting arms is provided with a rotating component for driving the traveling wheel to rotate.

[0022] By adopting the above technical solution, the three support arms of the two sets of support wheel sets and the traveling wheels support the frame, so that the frame is positioned on the axis of the pipe. The rotating parts drive the traveling wheels to rotate, which allows the frame to move inside the pipe. Furthermore, by adjusting the length of the support arms, the distance between the traveling wheels and the frame can be adjusted, improving the travel ability of the traveling wheels inside the pipe and adapting to movement in pipes of different diameters.

[0023] This application provides a method for detecting hidden defects in buried pipelines, which adopts the following technical solution: A method for detecting hidden defects in buried pipelines includes the following steps: S1: The operator places the frame into the pipeline with the defect to be detected, and the support and travel mechanism drives the frame to move along the axis of the pipeline inside the pipeline; S2: During the movement of the frame, the cleaning mechanism scrapes away impurities on the inner wall of the pipeline, and the collection component removes impurities from the bottom wall of the pipeline; S3: The adjustment component drives multiple probes to move towards the inner wall of the pipeline, and the multiple probes abut against the inner wall of the pipeline through the coupling capsule. The probes emit high-frequency acoustic pulses, which are propagated to the pipeline through the coupling capsule. The probes then receive the echo signal, and the host identifies the pipeline defect through the echo signal; S4: The adjustment component drives the multiple probes to move the coupling capsule away from the inner wall of the pipeline, and the support and travel mechanism drives the frame to move along the pipeline to the next detection section for detection.

[0024] In summary, this application includes at least one of the following beneficial technical effects: by using a coupling capsule inside the pipeline to couple the probe with the pipeline, the acoustic coupling effect is improved, thereby improving the accuracy of detection and defect location, and effectively improving the accuracy of hidden defect detection in buried pipelines; when the adjusting ring drives the adjusting arm to open, the piston can squeeze the coupling fluid in the storage tank into the filling section, filling the increased diameter filling section and corrugated section; when the adjusting ring drives multiple adjusting arms to close, the coupling fluid in the filling section and corrugated section can be squeezed into the storage tank as the diameter decreases, conveniently realizing the supply and extrusion of coupling fluid in the filling section and corrugated section; the cleaning shovel first removes the shoveled impurities, and then the driving component drives the roller brush to rotate. The brush bristles lift up the remaining smaller impurities on the bottom wall of the pipeline, and the adsorption component then sucks the smaller impurities on the bottom wall of the pipeline into the collection box, effectively improving the cleaning effect of the pipeline. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the buried pipeline hidden defect detection device according to an embodiment of this application.

[0026] Figure 2 This is a cross-sectional view of the frame according to an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the ultrasonic testing mechanism according to an embodiment of this application.

[0028] Reference numerals: 1. Frame; 2. Support and travel mechanism; 21. Support wheel assembly; 211. Support arm; 212. Traveling wheel; 3. Ultrasonic testing mechanism; 31. Main unit; 32. Probe; 33. Coupling capsule; 331. Filling section; 332. Corrugated section; 333. Liquid storage assembly; 3331. Liquid storage tank; 3332. Piston; 3333. Linkage rod; 4. Cleaning mechanism; 41. Cleaning shovel; 411. Support base; 412. Sliding component; 413. Support rod; 414. Shovel blade; 5. Adjustment assembly; 51. Adjusting arm; 52. Adjusting ring; 53. Control component; 6. Collection assembly; 61. Roller brush; 62. Drive component; 63. Collection box; 64. Adsorption component; 7. Rotating component. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0030] This application discloses a device and method for detecting hidden defects in buried pipelines.

[0031] Reference Figure 1 The buried pipeline hidden defect detection device includes a frame 1, a support and travel mechanism 2, an ultrasonic detection mechanism 3, a cleaning mechanism 4, an adjustment component 5, and a collection component 6.

[0032] Reference Figure 1 The support travel mechanism 2 is mounted on the frame 1. The support travel mechanism 2 is used to drive the frame 1 to travel along the axis of the pipe inside the pipe. The support travel mechanism 2 includes at least two sets of support wheel sets 21. The two sets of support wheel sets 21 are respectively mounted at both ends of the axial direction of the frame 1. Each set of support wheel sets 21 includes at least three support arms 211 and a traveling wheel 212. The three support arms 211 are circumferentially spaced at the ends of the axial direction of the frame 1. The length of the support arms 211 is telescopic. The traveling wheel 212 is mounted at the end of the support arm 211 away from the frame 1. In this embodiment, the support arm 211 is an electric actuator. The electric actuator is mounted obliquely on the frame 1. The traveling wheel 212 is mounted on the piston rod of the electric actuator. A rotating component 7 is mounted on one of the support arms 211. The rotating component 7 is used to drive the traveling wheel 212 to rotate. In this embodiment, the rotating component 7 includes a servo motor. The servo motor is mounted on the support arm 211. The output shaft of the servo motor is coaxially connected to the traveling wheel 212.

[0033] The operator places the frame 1 into the pipe to be inspected and adjusts the three support arms 211 of each set of support wheels 21 to extend synchronously, so that the support wheels on the three support arms 211 press against the inner wall of the pipe. The three support arms 211 of the two sets of support wheels 21 and the traveling wheels 212 support the frame 1, so that the frame 1 is positioned on the axis of the pipe. Then, the rotating component 7 drives one of the traveling wheels 212 to rotate, and the traveling wheel 212 drives the frame 1 to move along the axis of the pipe. By adjusting the length of the support arm 211, the distance between the traveling wheel 212 and the frame 1 can be adjusted, improving the applicability of traveling in pipes of different diameters. When one of the traveling wheels 212 encounters an obstacle, the support arm 211 of that traveling wheel 212 is shortened, so that the traveling wheel 212 can bypass the obstacle, improving the passage of the traveling wheel 212 in the pipe.

[0034] Reference Figure 1 , Figure 2 The cleaning mechanism 4 is installed on the frame 1. The cleaning mechanism 4 is used to clean the inner wall of the pipe. The cleaning mechanism 4 includes multiple cleaning shovels 41. The multiple cleaning shovels 41 are distributed at intervals along the circumference of the frame 1 and at intervals along the axial direction of the frame 1, so that the ends of adjacent cleaning shovels 41 away from the frame 1 are staggered in the circumference of the frame 1. Thus, when the frame 1 moves in the pipe, the multiple cleaning shovels 41 with their staggered ends away from the frame 1 can cover the inner wall of the pipe circumferentially, thereby cleaning the inner wall of the pipe better.

[0035] Reference Figure 1 , Figure 2 The cleaning shovel 41 includes a support base 411, a sliding member 412, a support rod 413, and a shovel blade 414. The support base 411 is slidably mounted on the frame 1 along the radial direction of the frame 1. The sliding member 412 is mounted on the frame 1 and is used to drive the support base 411 to slide. In this embodiment, the sliding member 412 is an electric actuator, which is mounted on the frame 1 and its piston rod is connected to the support base 411. Multiple support rods 413 are mounted on the support base 411 and are spaced apart along the circumference of the frame 1. The support rods 413 can extend and retract. In this embodiment, the support rods 413 are electric actuators. The shovel blade 414 is mounted on the extension and retraction ends of the multiple support rods 413 and can deform. In this embodiment, the shovel blade 414 is made of aluminum alloy sheet.

[0036] As the frame 1 moves within the pipe, the sliding element 412 drives the support base 411 to move away from the frame 1. The support base 411 then moves multiple support rods 413, which in turn move the scraper blade 414 against the inner wall of the pipe. As the frame 1 moves within the pipe, it scrapes away impurities from the inner wall. The scraper blade 414 at the bottom can also remove larger impurities from the bottom wall of the pipe. Furthermore, the sliding element 412 drives the support base 411 to slide radially towards the frame 1, allowing the multiple support rods 413 to move the scraper blade 414. This adjusts the distance the scraper blade 414 extends beyond the frame 1. By adjusting the extension and retraction lengths of the different support rods 413 on the support base 411, the scraper blade 414 can be deformed, allowing its curvature to adapt to different pipe diameters and improving its applicability for cleaning pipes of different diameters.

[0037] Reference Figure 1 , Figure 2 The collection component 6 is installed on the frame 1 behind the cleaning shovel 41 in the traveling direction of the frame 1. The collection component 6 is used to remove impurities from the bottom wall of the pipe. The collection component 6 includes a roller brush 61, a drive component 62, a collection box 63, and an adsorption component 64. The roller brush 61 is rotatably installed at the bottom of the frame 1, and the bristles of the roller brush 61 extend out of the brush body and abut against the inner bottom wall of the pipe. The drive component 62 is installed on the frame 1 and is used to drive the roller brush 61 to rotate. In this embodiment, the drive component 62 is a servo motor, which is installed on the frame 1. The output shaft of the servo motor is coaxially connected to the roller brush 61. The collection box 63 is installed on the frame 1, and the adsorption component 64... The adsorption element 64 is installed on the roller brush 61. The adsorption element 64 is used to collect the impurities in the adsorption collection box 63. In this embodiment, the adsorption element 64 includes an exhaust fan and an exhaust pipe. The exhaust fan is installed on the collection box 63, and the exhaust pipe is connected to the collection box 63. A filter screen is installed at the connection between the exhaust fan and the collection box 63. The exhaust pipe is connected to the brush body of the roller brush 61. The brush body of the roller brush 61 is hollow inside and has multiple adsorption holes. When the exhaust fan is turned on, the exhaust fan draws away the gas in the collection box 63. The collection box 63 can then be made to have a negative pressure state on the brush body of the roller brush 61 through the exhaust pipe, so that the impurities are sucked away from the adsorption holes on the brush body of the roller brush 61.

[0038] As the frame 1 moves, the cleaning shovel 41 removes impurities from the inner wall of the pipe. The cleaning shovel 41 below then removes larger impurities that have fallen onto the bottom wall of the pipe. The drive unit 62 then drives the roller brush 61 to rotate. The bristles of the roller brush 61 lift up the remaining smaller impurities on the bottom wall of the pipe. The adsorption unit 64 then sucks the smaller impurities on the bottom wall of the pipe into the collection box 63, effectively improving the cleaning effect of the pipe and facilitating more accurate detection of pipe defects in the future.

[0039] Reference Figure 2, Figure 3 An ultrasonic testing mechanism 3 is installed on the frame 1 behind the collecting assembly 6 in the direction of travel. The ultrasonic testing mechanism 3 is used to detect defects in pipes using sound waves. The ultrasonic testing mechanism 3 includes a main body, probes 32, and a coupling capsule 33. The main body 31 is installed on the frame 1. Multiple probes 32 are circumferentially arranged around the frame 1, and all probes 32 are electrically connected to the main body 31. All probes 32 are slidably mounted on the frame 1 in the axial direction. An adjusting assembly 5 is installed on the frame 1 and is used to drive multiple probes 32 towards the frame 1. The adjusting assembly 5 includes adjusting arms 51, adjusting rings 52, and control components 53. Multiple adjusting arms 51 are hinged on the frame 1, and all adjusting arms 51 are inclined in the same direction. Connected to a probe 32, an adjusting ring 52 is slidably mounted on the frame 1 between multiple adjusting arms 51 along the axial direction of the frame 1. The adjusting ring 52 is slidably connected to the multiple adjusting arms 51. In this embodiment, a T-shaped groove is provided on the side of the multiple adjusting arms 51 that are close to each other. Multiple T-shaped blocks are installed on the adjusting ring 52, and one T-shaped block slides in one T-shaped groove, thereby realizing the sliding connection between the adjusting ring 52 and the multiple adjusting arms 51. A control component 53 is mounted on the frame 1 and is used to drive the adjusting ring 52 to slide. In this embodiment, the control component 53 is an electric actuator, which is mounted on the frame 1. The piston rod of the electric actuator is connected to the control ring. In this embodiment, all electric actuators are electro-hydraulic actuators, which are easy to lock after stopping and maintain the stability of the piston rod position.

[0040] When the frame 1 moves inside the pipe, the control unit 53 drives the adjusting ring 52 to slide between the multiple adjusting arms 51 toward the end that is closer to each other. The adjusting ring 52 then drives the multiple adjusting arms 51 to rotate and retract. The multiple adjusting arms 51 drive the multiple probes 32 to retract, facilitating the movement of the frame 1 inside the pipe. When it is necessary to detect pipe defects, the control unit 53 drives the adjusting ring 52 to slide between the multiple adjusting arms 51 toward the end that is closer to each other. The adjusting ring 52 then drives the multiple adjusting arms 51 to rotate and unfold. The multiple adjusting arms 51 drive the multiple probes 32 to unfold to different diameters, conveniently retracting or unfolding the multiple probes 32 to meet the needs of detecting pipes of different diameters.

[0041] Reference Figure 2 , Figure 3The coupling capsule 33 is circumferentially sleeved on the side of the plurality of probes 32 facing away from the frame 1. The diameter of the coupling capsule 33 is expandable. The coupling capsule 33 includes a filling section 331, a corrugated section 332, and a liquid storage assembly 333. The filling section 331 is mounted on the probe 32, and the corrugated section 332 is connected and installed between adjacent filling sections 331. In this embodiment, both the filling section 331 and the corrugated section 332 are made of rubber. The liquid storage assembly 333 is mounted on the frame 1 and is used to input coupling fluid into the filling section 331 and the corrugated section 332. The liquid storage assembly 333 includes a liquid storage tank 3331, a piston 3332, and a linkage rod 3333. The liquid storage tank 3331 is mounted on the frame 1. The liquid storage tank 3331 is connected to one of the filling sections 331 through a hose. The piston 3332 is slidably mounted in the liquid storage tank 3331. The linkage rod 3333 is slidably inserted into the liquid storage tank 3331. The linkage rod 3333 extends into the liquid storage tank 3331 and is connected to the side of the piston 3332 away from the connection between the liquid storage tank 3331 and the filling section 331. The linkage rod 3333 is also connected to the adjusting ring 52. When the adjusting ring 52 drives the multiple adjusting arms 51 to open, the linkage rod 3333 drives the piston 3332 to move toward the connection side between the liquid storage tank 3331 and the filling section 331.

[0042] As the frame 1 travels within the pipeline, it drives multiple adjusting arms 51 to move closer together. These adjusting arms 51, via probes 32, cause multiple filling sections 331 to contract and move closer together. The linkage rod 3333 drives the piston 3332 to move away from the connection between the storage tank 3331 and the filling section 331, causing the storage tank 3331 to release space for the coupling fluid. As the probes 32 retract, the coupling fluid inside the filling and corrugated sections is squeezed into the storage tank 3331, reducing the diameter of the coupling capsule 33. With the probes 32 retracting, this facilitates the movement of the frame 1 within the pipeline. When pipeline defects need to be detected, the adjusting arms 51... Multiple probes 32 are deployed, and the multiple probes 32 pull the corrugated section 332 to deploy through the filling section 331. The linkage rod 3333 pushes the piston 3332 to move towards the communication side between the liquid storage tank 3331 and the filling section 331. The piston 3332 can squeeze the coupling fluid in the liquid storage tank 3331 into the filling section 331, filling the increased diameter filling section 331 and corrugated section 332. This makes the diameter of the coupling capsule 33 increase and fit against the inner wall of the pipe. This facilitates the supply and extrusion of coupling fluid in the filling section 331 and corrugated section 332, and improves the applicability of the coupling capsule 33 to different diameter requirements, meeting the needs of testing pipes of different diameters.

[0043] A method for detecting hidden defects in buried pipelines includes the following steps: S1: The operator places the frame 1 into the pipeline with the defect to be detected, and the supporting travel mechanism 2 drives the frame 1 to move along the pipeline axis inside the pipeline; S2: The cleaning mechanism 4 scrapes impurities off the inner wall of the pipeline during the movement of the frame 1, and the collection component 6 removes impurities from the bottom wall of the pipeline; S3: The adjusting component 5 drives multiple probes 32 to move towards the inner wall of the pipeline. The multiple probes 32 abut against the inner wall of the pipeline through the coupling capsule 33. The probes 32 emit high-frequency acoustic pulses, which are transmitted to the pipeline through the coupling capsule 33. The probes 32 then receive the echo signals, and the host 31 identifies the pipeline defects through the echo signals; S4: The adjusting component 5 drives the multiple probes 32 to move the coupling capsule 33 away from the inner wall of the pipeline, and the supporting travel mechanism 2 drives the frame 1 to move along the pipeline to the next detection section for detection.

[0044] The implementation principle of the buried pipeline hidden defect detection device and detection method in this application embodiment is as follows: The frame 1 is placed in the pipeline to be detected for hidden defects. The supporting traveling mechanism 2 drives the frame 1 to move along the axis of the pipeline inside the pipeline. The cleaning mechanism 4 and the collecting component 6 clean the inner wall of the pipeline during the movement of the frame 1. Then, the adjusting component 5 drives multiple probes 32 to unfold. The multiple probes 32 drive the coupling capsule 33 to fit between the probes 32 and the inner wall of the pipeline, so as to achieve better coupling between the probes 32 and the inner wall of the pipeline. The multiple probes 32 emit high-frequency sound wave pulses. The high-frequency sound wave pulses are propagated to the pipeline through the coupling capsule 33. After being reflected, the high-frequency sound wave pulses are received by the probes 32. The host 31 can identify the pipeline defects by distinguishing the echo signal of the intact pipe wall from the echo signal of the pipe wall with cracks, slag inclusions, holes, etc. By using the coupling capsule 33 from inside the pipeline to couple the probes 32 with the pipeline, the sound wave coupling effect is improved, thereby improving the accuracy of detection and defect location, and effectively improving the accuracy of hidden defect detection of buried pipelines.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for detecting hidden defects in a buried pipeline, characterized in that: The device includes a frame (1), a supporting travel mechanism (2), an ultrasonic testing mechanism (3), and a cleaning mechanism (4). The supporting travel mechanism (2) is mounted on the frame (1) and is used to drive the frame (1) to travel along the axis of the pipe inside the pipe. The ultrasonic testing mechanism (3) is mounted on the frame (1) and is used to detect defects in the pipe by means of sound waves. The ultrasonic testing mechanism (3) includes a host (31), a probe (32), and a coupling capsule (33). The host (31) is mounted on the frame (1). Multiple probes (32) are circumferentially arranged on the frame (1). All probes (32) are electrically connected to the host (31). The coupling capsule (33) is located between the probe (32) and the inner wall of the pipe. The cleaning mechanism (4) is mounted on the frame (1) and is used to clean the inner wall of the pipe.

2. The apparatus for detecting hidden defects of a buried pipeline according to claim 1, wherein: Multiple probes (32) are slidably mounted on the frame (1) in the direction of the axial direction toward the frame (1). The frame (1) is provided with an adjustment component (5) for driving multiple probes (32) to move toward the frame (1). The coupling capsule (33) is circumferentially sleeved on the side of the multiple probes (32) away from the frame (1). The diameter of the coupling capsule (33) is telescopic.

3. The apparatus for detecting hidden defects of a buried pipeline according to claim 2, wherein: The adjustment assembly (5) includes an adjustment arm (51), an adjustment ring (52), and a control element (53). Multiple adjustment arms (51) are hinged on the frame (1). Each adjustment arm (51) is connected to a probe (32). The adjustment ring (52) is slidably disposed on the frame (1) between the multiple adjustment arms (51) along the axial direction of the frame (1). The adjustment ring (52) is slidably connected to the multiple adjustment arms (51). The control element (53) is disposed on the frame (1) and is used to drive the adjustment ring (52) to slide.

4. The apparatus for detecting hidden defects of a buried pipeline according to claim 1, wherein: The coupling capsule (33) includes a filling section (331), a corrugated section (332), and a reservoir assembly (333). The filling section (331) is disposed on the probe (32), and the corrugated section (332) is disposed between adjacent filling sections (331). The reservoir assembly (333) is disposed on the frame (1) and is used to input coupling fluid into the filling section (331) and the corrugated section (332).

5. The apparatus for detecting hidden defects of a buried pipeline according to claim 4, wherein: The liquid storage assembly (333) includes a liquid storage tank (3331), a piston (3332), and a linkage rod (3333). The liquid storage tank (3331) is mounted on the frame (1) and communicates with the filling section (331). The piston (3332) is slidably mounted on the liquid storage tank (3331). The linkage rod (3333) is mounted on the piston (3332) and connected to the adjusting ring (52). When the adjusting ring (52) drives multiple adjusting arms (51) to open, the linkage rod (3333) drives the piston (3332) to move toward the communication side between the liquid storage tank (3331) and the filling section (331).

6. The apparatus for detecting hidden defects of a buried pipeline according to claim 1, wherein: The cleaning mechanism (4) includes a plurality of cleaning shovels (41), which are distributed circumferentially along the frame (1) and axially along the frame (1). The ends of adjacent cleaning shovels (41) away from the frame (1) are staggered.

7. The apparatus for detecting hidden defects of a buried pipeline according to claim 6, wherein: The cleaning shovel (41) includes a support base (411), a sliding member (412), a support rod (413), and a shovel blade (414). The support base (411) is slidably disposed on the frame (1) along the radial direction of the frame (1). The sliding member (412) is disposed on the frame (1) and is used to drive the support base (411) to slide. Multiple support rods (413) are disposed on the support base (411). The support rods (413) are telescopic. The shovel blade (414) is disposed on multiple support rods (413) and is deformable.

8. The apparatus for detecting hidden defects of a buried pipeline according to claim 1, wherein: The frame (1) is provided with a collection assembly (6) for removing impurities from the inner bottom wall of the pipe. The collection assembly (6) includes a roller brush (61), a drive unit (62), a collection box (63), and an adsorption unit (64). The roller brush (61) is rotatably mounted on the frame (1), and the bristles of the roller brush (61) abut against the inner bottom wall of the pipe. The drive unit (62) is mounted on the frame (1) and is used to drive the roller brush (61) to rotate. The collection box (63) is mounted on the frame (1), and the adsorption unit (64) is mounted on the roller brush (61) and is used to adsorb impurities into the collection box (63).

9. The apparatus for detecting hidden defects of a buried pipeline according to claim 1, wherein: The supporting travel mechanism (2) includes at least two sets of supporting wheel sets (21). The two sets of supporting wheel sets (21) are respectively arranged at both ends of the frame (1) in the axial direction. Each set of supporting wheel sets (21) includes at least three supporting arms (211) and a traveling wheel (212). The three supporting arms (211) are arranged at intervals along the circumference of the frame (1) on the frame (1). The length of the supporting arm (211) is telescopic. The traveling wheel (212) is arranged on the supporting arm (211). One of the supporting arms (211) is provided with a rotating component (7) for driving the traveling wheel (212) to rotate.

10. A method of using the device for detecting hidden defects in a buried pipeline according to any one of claims 1 to 9, characterized in that: Includes the following steps: S1: The staff places the frame (1) into the pipe with the defect to be inspected, and the support travel mechanism (2) drives the frame (1) to travel along the axis of the pipe inside the pipe; S2: The cleaning mechanism (4) scrapes the impurities on the inner wall of the pipe away from the pipe during the movement of the frame (1), and the collection component (6) removes the impurities on the bottom wall of the pipe. S3: The adjustment component (5) drives multiple probes (32) to move toward the inner wall of the pipe. Multiple probes (32) abut against the inner wall of the pipe through the coupling capsule (33). The probes (32) emit high-frequency sound pulses. The high-frequency sound pulses are transmitted to the pipe through the coupling capsule (33). The probes (32) then receive the echo signal. The host (31) identifies the defects in the pipe through the echo signal. S4: The adjustment component (5) drives multiple probes (32) to move the coupling capsule (33) away from the inner wall of the pipe, and supports the traveling mechanism (2) to drive the frame (1) to travel along the pipe to the next detection section for detection.

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