A non-invasive marine methanol fuel line leak detection device

Abstract

The application relates to the technical field of methanol detection, in particular to a non-invasive marine methanol fuel pipeline leakage detection device, which comprises an arc-shaped plate, distributed optical fibers, a plurality of ultrasonic sensors, two tension degree adjusting assemblies, a stroke adjusting assembly and a mechanical linkage module. A plurality of optical fiber placing grooves and a plurality of ultrasonic mounting grooves are formed in the arc-shaped plate. The middle part of the distributed optical fibers is arranged in an S shape in the plurality of optical fiber placing grooves. The tension degree adjusting assemblies are used for adjusting the tension degree of the distributed optical fibers. The stroke adjusting assembly is used for adjusting the spacing between the ultrasonic sensors and the pipeline wall. The mechanical linkage module is used for synchronously driving the two tension degree adjusting assemblies and the stroke adjusting assembly to act. The mechanical linkage module synchronously drives the tension degree adjusting assembly and the ultrasonic probe stroke adjusting assembly, so that the tension state of the distributed optical fibers and the spacing between the ultrasonic sensors and the pipeline wall are cooperatively switched.

Description

Technical Field

[0001] This invention relates to the field of methanol detection technology, specifically to a non-invasive marine methanol fuel pipeline leak detection device. Background Technology

[0002] In the shipping industry, methanol fuel is widely used in marine power systems due to its clean and environmentally friendly characteristics. The sealing integrity of the methanol fuel pipeline is directly related to the safety of ship navigation. Once a leak occurs, it will not only cause fuel loss, but also easily lead to safety accidents such as fire and explosion. Therefore, real-time leak detection of methanol fuel pipeline is particularly important.

[0003] Existing marine methanol fuel pipeline leak detection devices mostly employ a single detection accuracy design, making it difficult to adapt to the dual operational requirements of routine daily pipeline monitoring and high-precision detection during nitrogen purging. Marine methanol fuel pipelines require long-term routine leak monitoring; using a high-precision detection mode in this case would result in excessive power consumption of the detection system, and overly sensitive detection components would be susceptible to false alarms due to normal pipeline vibration and environmental temperature changes, affecting the stability and convenience of monitoring. Furthermore, during pipeline nitrogen purging operations, changes in the medium state within the pipeline can easily lead to minute leaks. Conventional low-precision detection devices, due to insufficient detection sensitivity, cannot accurately identify these minute leaks and cannot meet the high-precision detection requirements of the purging process. Summary of the Invention

[0004] To address the aforementioned issues, a non-invasive marine methanol fuel pipeline leak detection device is provided. This device synchronously drives the tension adjustment component and the ultrasonic probe stroke adjustment component through a mechanical linkage module, thereby enabling coordinated switching of the distributed fiber optic tension state and the distance between the ultrasonic sensor and the pipe wall. This allows for flexible switching between two modes: conventional monitoring and high-precision nitrogen purging detection.

[0005] To address the problems of existing technologies, this invention provides a non-invasive marine methanol fuel pipeline leak detection device, comprising an arc-shaped plate, distributed optical fibers, multiple ultrasonic sensors, two tension adjustment components, a stroke adjustment component, and a mechanical linkage module. The inner arc surface of the arc-shaped plate is fitted to the outer wall of the pipeline. Multiple optical fiber placement slots and multiple ultrasonic mounting slots are formed on the arc-shaped plate, and arc-shaped fixing blocks are fixed at both ends of the arc-shaped plate. The two ends of the distributed optical fiber are respectively fixed to the two arc-shaped fixing blocks, and the middle part of the distributed optical fiber is arranged in an S-shape within the multiple optical fiber placement slots. Multiple ultrasonic sensors are installed one-to-one within the multiple ultrasonic mounting slots. The two tension adjustment components are respectively located on both sides of the arc-shaped plate and connected to the reversing point of the distributed optical fiber, used to adjust the tension of the distributed optical fiber. The stroke adjustment component is connected to the ultrasonic sensors and used to adjust the distance between the ultrasonic sensors and the pipeline wall. The mechanical linkage module is drively connected to the two tension adjustment components and the stroke adjustment component, synchronously driving their operation.

[0006] Preferably, the tension adjustment component includes a first mounting frame and a plurality of first pulleys; the first mounting frame is disposed on one side of the arc-shaped plate, and connecting blocks connected to the mechanical linkage module are fixed at both ends; the plurality of first pulleys are spaced apart on the first mounting frame and abut against the reversing point of the distributed optical fiber.

[0007] Preferably, the tension adjustment assembly further includes two first guide rods, which are respectively fixed to one end of the two arc-shaped fixing blocks, with their axes parallel to the tangent of the arc-shaped plate, and the connecting block is slidably sleeved on the first guide rods.

[0008] Preferably, the tension adjustment assembly further includes a clamping assembly, which is disposed on the side of the first mounting frame away from the arc-shaped plate, and the clamping assembly cooperates with the first mounting frame and the first pulley to clamp the distributed optical fiber.

[0009] Preferably, the stroke adjustment assembly includes multiple connecting components and a synchronizing rod; the multiple connecting components are connected one-to-one with the multiple ultrasonic sensors; the synchronizing rod is connected to the multiple connecting components and is also connected to the mechanical linkage module.

[0010] Preferably, the connecting assembly includes a mounting plate and a plurality of elastic telescopic columns; the middle part of the mounting plate is connected to the synchronization rod, and the ultrasonic sensor is disposed on the side of the mounting plate facing the pipe wall; the plurality of elastic telescopic columns are used to guide the movement of the mounting plate and push the mounting plate to reset.

[0011] Preferably, the mechanical linkage module includes two linkage components and a drive component; the linkage components are connected to the two tension adjustment components; the drive component is connected to the two linkage components, and the tension adjustment components are driven by the two linkage components to adjust the tension of the distributed optical fiber.

[0012] Preferably, the linkage assembly includes a linkage plate, two linkage arms, and a guide assembly; the linkage plate is connected to the drive assembly; the two linkage arms are respectively disposed at both ends of the linkage plate, and the linkage arms are connected to the tension adjustment assembly; the guide assembly is used to guide the movement of the linkage plate.

[0013] Preferably, the linkage arm has a sliding groove, which is connected to the stroke adjustment component.

[0014] Preferably, the drive assembly includes a rotating shaft and an adjustment and locking assembly; the rotating shaft is connected to the two arc-shaped fixing blocks via two bearing seats, and two cams are provided on the rotating shaft, with the two cams respectively connected to the two linkage assemblies; the adjustment and locking assembly is used to fix the rotating shaft.

[0015] The advantages of this invention application compared to the prior art are:

[0016] 1. This invention application includes an arc-shaped plate, distributed optical fiber, ultrasonic sensor, tension adjustment component, stroke adjustment component, and mechanical linkage module. The arc-shaped plate conforms to the outer wall of the pipeline to form the detection base. The mechanical linkage module synchronously drives the tension adjustment component and the stroke adjustment component on both sides. The tension adjustment component adjusts the tension state of the distributed optical fiber, and the stroke adjustment component changes the distance between the ultrasonic sensor and the pipeline wall. By synchronously driving the tension adjustment component and the ultrasonic probe stroke adjustment component through the mechanical linkage module, the coordinated switching of the tension state of the distributed optical fiber and the distance between the ultrasonic sensor and the pipeline wall is achieved, thereby enabling flexible switching between two modes: conventional monitoring and high-precision detection with nitrogen purging.

[0017] 2. This invention application provides a first mounting frame and a first pulley. The first pulley is positioned around and abuts against the distributed optical fiber commutation point, cooperating with the first mounting frame to form an optical fiber commutation support. A connecting block connects the first mounting frame and the mechanical linkage module. In the normal mode, the mechanical linkage module has no transmission, and the first mounting frame and the first pulley are stationary, only providing support for the slack optical fiber. In the nitrogen purging mode, the mechanical linkage module pushes the connecting block, causing the first mounting frame and the first pulley to move away from the arc plate, pulling the optical fiber commutation point to achieve initial tension. After detection, the mechanical linkage module pushes the connecting block to reset, and the optical fiber returns to slack. The first pulley provides rolling support for the distributed optical fiber commutation point, reducing frictional loss during the tensioning and slackening process of the distributed optical fiber and extending the service life of the distributed optical fiber.

[0018] 3. This invention application provides a first guide rod, which is slidably fitted onto the connecting block to provide guidance and constraint for its movement. The connecting block is linked to the first mounting bracket and the first pulley. In the nitrogen cleaning and detection mode, the mechanical linkage module drives the connecting block to slide away from the arc plate along the axis of the first guide rod, thereby moving the first mounting bracket and the first pulley along a fixed trajectory to tension the distributed optical fiber at the commutation point. During reset, the connecting block slides in the opposite direction along the first guide rod, causing the relevant components to return to their positions. The guiding effect of the first guide rod ensures the linearity of the optical fiber tension and relaxation adjustment and avoids uneven force on the optical fiber caused by the offset of the mounting bracket. Attached Figure Description

[0019] Figure 1 This is a perspective view of a non-invasive marine methanol fuel pipeline leak detection device according to the present invention application.

[0020] Figure 2 This is a top view of a non-invasive marine methanol fuel pipeline leak detection device according to the present invention.

[0021] Figure 3 yes Figure 2 A three-dimensional sectional view at point AA.

[0022] Figure 4 This is a perspective view of the arc-shaped plate, arc-shaped fixing plate, distributed optical fiber, and tension adjustment assembly in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0023] Figure 5 This is a perspective view of the first mounting bracket, first pulley, first guide rod, and clamping assembly in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0024] Figure 6 This is a perspective view of the distributed optical fiber, first mounting bracket, first pulley, second mounting bracket, and second pulley in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0025] Figure 7 This is a perspective view of the ultrasonic sensor, connecting components, and synchronization rod in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0026] Figure 8 This is a perspective view of the ultrasonic sensor, mounting plate, and elastic telescopic column in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0027] Figure 9 This is a perspective view of the arc-shaped fixing plate, tension adjustment component, stroke adjustment component, linkage component, and drive component in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0028] Figure 10 This is a perspective view of the arc-shaped fixing plate, tension adjustment component, linkage plate, linkage arm, guide component, rotating shaft, and adjustment locking component in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0029] Figure 11 This is a perspective view of the arc-shaped fixing plate, stroke adjustment component, linkage plate, linkage arm, and guide component in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0030] Figure 12 This is a perspective view of the arc-shaped fixing plate, linkage plate, guide assembly, rotating shaft, and adjustment and locking assembly in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0031] Figure 13 This is a perspective view of the rotating shaft, cam, sliding shaft, locking block, and positioning ring in a non-invasive marine methanol fuel pipeline leak detection device according to this invention application.

[0032] The diagram is labeled as follows: 1. Arc-shaped plate; 11. Fiber optic placement slot; 12. Ultrasonic mounting slot; 2. Arc-shaped fixing block; 3. Distributed optical fiber; 4. Ultrasonic sensor; 5. Tension adjustment assembly; 51. First mounting bracket; 511. Connecting block; 52. First pulley; 53. First guide rod; 54. Clamping assembly; 541. Second mounting bracket; 542. Second pulley; 6. Stroke adjustment assembly; 61. Connecting assembly; 611. Mounting plate; 61 2. Elastic telescopic column; 62. Synchronous rod; 7. Mechanical linkage module; 71. Linkage component; 711. Linkage plate; 712. Linkage arm; 7121. Slide groove; 713. Guide component; 7131. Second guide rod; 7132. Spring; 7133. Limit plate; 72. Drive component; 721. Rotary shaft; 7211. Cam; 722. Adjustment and locking component; 7221. Sliding shaft; 7222. Locking block; 7223. Positioning ring. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by this invention application, the invention application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 13As shown: A non-invasive marine methanol fuel pipeline leak detection device includes an arc-shaped plate 1, distributed optical fibers 3, multiple ultrasonic sensors 4, two tension adjustment components 5, a stroke adjustment component 6, and a mechanical linkage module 7. The inner arc surface of the arc-shaped plate 1 is fitted to the outer wall of the pipeline. Multiple optical fiber placement slots 11 and multiple ultrasonic mounting slots 12 are formed on the arc-shaped plate 1. Arc-shaped fixing blocks 2 are fixed at both ends of the arc-shaped plate 1. The two ends of the distributed optical fibers 3 are respectively fixed to the two arc-shaped fixing blocks 2, and the middle part of the distributed optical fibers 3 is arranged in an S-shape. The system includes multiple fiber placement slots 11; multiple ultrasonic sensors 4 are installed one-to-one in multiple ultrasonic mounting slots 12; two tension adjustment components 5 are respectively located on both sides of the arc plate 1 and connected to the reversing point of the distributed optical fiber 3, used to adjust the tension of the distributed optical fiber 3; the stroke adjustment component 6 is connected to the ultrasonic sensor 4, used to adjust the distance between the ultrasonic sensor 4 and the pipe wall; the mechanical linkage module 7 is connected to both tension adjustment components 5 and stroke adjustment component 6, driving them to move synchronously.

[0035] During installation, this non-invasive marine methanol fuel pipeline leak detection device is formed by attaching the inner arc surface of the arc plate 1 to the outer wall of the marine methanol fuel pipeline. The detection device can switch between two modes: conventional monitoring and high-precision detection with nitrogen purging. In conventional monitoring mode, the mechanical linkage module 7 has no driving action, the tension adjustment components 5 on both sides remain stationary, and the distributed optical fiber 3 is in a relaxed state. At this time, the optical fiber is only indirectly attached to the pipeline. The slight temperature and strain changes caused by pipeline leakage can only cause small changes in the transmission of optical fiber signals, which can only identify obvious leakage faults and has low detection accuracy, while taking into account the low power consumption and convenience of daily monitoring. At the same time, the stroke adjustment component 6 does not move, and the ultrasonic sensor 4 maintains a preset distance from the pipeline wall. When the ultrasonic signal emitted by the sensor propagates to the pipeline wall, it is attenuated and scattered by the air medium. The receiving sensitivity of the ultrasonic echo of leakage is low, which can only detect the strong ultrasonic signal generated by larger leakage, thus realizing pipeline foundation leakage monitoring. In nitrogen purging detection mode, the mechanical linkage module 7 synchronously outputs driving force to the two tension adjustment components 5 and the stroke adjustment component 6. The tension adjustment component 5 is driven to pull the reversing point of the distributed optical fiber 3, switching the optical fiber from a relaxed state to a tensioned state. At this time, the optical fiber is straightened and tightly attached to the arc plate 1. The minute temperature and strain changes of the pipeline leak are directly and quickly transmitted to the optical fiber, causing obvious characteristic changes in the optical signal transmission. This allows for accurate identification of minute leaks and a significant improvement in detection accuracy. At the same time, the stroke adjustment component 6 is driven to push the ultrasonic sensor 4 closer to the pipe wall, greatly reducing the air medium gap between the sensor and the pipe wall, reducing the attenuation and scattering of the ultrasonic signal propagation. The sensor can directly and efficiently receive the minute ultrasonic echoes generated by the leak, improving the ultrasonic signal recognition sensitivity and detection accuracy, and completing the switch to the high-precision detection mode. After the nitrogen purging detection is completed, the mechanical linkage module 7 resets, driving the tension adjustment component 5 and the stroke adjustment component 6 back to their initial state. The distributed optical fiber 3 returns to a relaxed state, the ultrasonic sensor 4 returns to the preset distance between itself and the pipe wall, and the detection device switches back to the conventional monitoring mode to continue to realize the daily basic monitoring of the pipeline. The tension adjustment component 5 and the stroke adjustment component 6 are synchronously driven by the mechanical linkage module 7 to realize the coordinated switching of the tension state of the distributed optical fiber 3 and the distance between the ultrasonic sensor 4 and the pipe wall, thereby completing the flexible conversion between the two modes of conventional monitoring and high-precision detection by nitrogen purging.

[0036] Reference Figure 4 and Figure 5 As shown: The tension adjustment component 5 includes a first mounting frame 51 and a plurality of first pulleys 52; the first mounting frame 51 is disposed on one side of the arc plate 1, and both ends of it are fixed with connecting blocks 511 connected to the mechanical linkage module 7; the plurality of first pulleys 52 are spaced apart on the first mounting frame 51 and abut against the reversing point of the distributed optical fiber 3.

[0037] The commutation point of the distributed optical fiber 3 is supported by multiple first pulleys 52 on the first mounting frame 51, forming a commutation support for the optical fiber. In the normal monitoring mode, the mechanical linkage module 7 and the connecting block 511 have no transmission action, the first mounting frame 51 remains stationary, and the first pulleys 52 only provide support for the optical fiber, keeping the distributed optical fiber 3 in a relaxed state. In the nitrogen cleaning detection mode, the mechanical linkage module 7 pushes the connecting block 511, causing the first mounting frame 51 to move away from the arc plate 1. The first pulleys 52 move synchronously with the mounting frame, pulling the commutation point of the distributed optical fiber 3 to achieve initial tension adjustment of the distributed optical fiber 3. After the detection is completed, the mechanical linkage module 7 pushes the connecting block 511 to reset, the first mounting frame 51 and the first pulleys 52 return to their initial positions, and the optical fiber returns to a relaxed state. The rolling support of the commutation point of the distributed optical fiber 3 by the first pulleys 52 reduces frictional loss during the tensioning and relaxation process of the distributed optical fiber 3, extending the service life of the distributed optical fiber 3.

[0038] Reference Figure 4 and Figure 5 As shown: The tension adjustment component 5 also includes two first guide rods 53, which are respectively fixed to one end of the two arc-shaped fixing blocks 2, and their axes are parallel to the tangent of the arc-shaped plate 1. The connecting block 511 is slidably sleeved on the first guide rods 53.

[0039] The connecting block 511 is slidably mounted on the first guide rod 53, which provides guidance and constraint for the movement of the connecting block 511. In the nitrogen cleaning and detection mode, the mechanical linkage module 7 drives the connecting block 511 to slide away from the arc plate 1 along the axial direction of the first guide rod 53, which drives the first mounting bracket 51 and the first pulley 52 to move along a fixed trajectory, pulling the distributed optical fiber 3 to achieve tension at the reversal point. During reset, the mechanical linkage module 7 drives the connecting block 511 to slide in the opposite direction along the first guide rod 53, which drives the first mounting bracket 51 and the first pulley 52 back to the initial position. The first guide rod 53 provides guidance for the movement of the connecting block 511, ensuring the linearity of the optical fiber tension and relaxation adjustment and avoiding uneven force on the optical fiber caused by the offset of the mounting bracket.

[0040] Reference Figure 4 , Figure 5 and Figure 6 As shown: The tension adjustment component 5 further includes a clamping component 54, which is disposed on the side of the first mounting frame 51 away from the arc plate 1. The clamping component 54 cooperates with the first mounting frame 51 and the first pulley 52 to clamp the distributed optical fiber 3.

[0041] Specifically, the clamping assembly 54 includes a second mounting bracket 541 and a plurality of second pulleys 542. The second mounting bracket 541 is arranged parallel to the first mounting bracket 51. The plurality of second pulleys 542 are arranged one-to-one on the outside of the plurality of first pulleys 52. The distributed optical fiber 3 passes between the first pulleys 52 and the second pulleys 542.

[0042] In nitrogen purging detection mode, the connecting block 511 moves along the first guide rod 53, driving the first mounting bracket 51 to move. The second mounting bracket 541 moves synchronously with the first mounting bracket 51. The first pulley 52 and the second pulley 542 pull the optical fiber synchronously, and the optical fiber rolls and slides between them, achieving tension while preventing optical fiber slippage. In normal mode, the optical fiber is relaxed, but the clamping and limiting effect of the first pulley 52 and the second pulley 542 on the optical fiber is still effective, ensuring that the optical fiber is always laid within the preset track. The first pulley 52 and the second pulley 542 cooperate to clamp and limit the distributed optical fiber 3, effectively preventing the distributed optical fiber 3 from falling off or shifting during tensioning, relaxation, and pipeline vibration, ensuring the effectiveness of the detection of the distributed optical fiber 3.

[0043] Reference Figure 3 and Figure 7 As shown: The stroke adjustment component 6 includes multiple connecting components 61 and a synchronizing rod 62; the multiple connecting components 61 are connected one-to-one with the multiple ultrasonic sensors 4; the synchronizing rod 62 is connected to the multiple connecting components 61, and the synchronizing rod 62 is connected to the mechanical linkage module 7.

[0044] In the normal monitoring mode, the mechanical linkage module 7 and the synchronization rod 62 have no transmission movement, the connecting component 61 remains stationary, and the ultrasonic sensor 4 maintains a preset distance from the pipe wall. In the nitrogen purging detection mode, the mechanical linkage module 7 drives the synchronization rod 62 to move, which in turn drives all connecting components 61 to move synchronously. The connecting components 61 push the corresponding ultrasonic sensor 4 towards the pipe wall, ensuring that all ultrasonic sensors 4 simultaneously approach the pipe wall, guaranteeing that the distance between each sensor and the pipe wall is consistent. After the detection is completed, the mechanical linkage module 7 drives the synchronization rod 62 to reset, and the connecting component 61 drives the ultrasonic sensor 4 back to its initial position, restoring the normal monitoring distance. The synchronization rod 62 enables the synchronous driving of multiple connecting components 61, ensuring that the movement stroke of all ultrasonic sensors 4 is consistent, and that the distance between each sensor and the pipe wall is the same. This avoids the problem of inconsistent detection accuracy caused by the distance deviation of a single sensor, improving the overall accuracy and consistency of the device's detection.

[0045] Reference Figure 7 and Figure 8As shown: The connecting assembly 61 includes a mounting plate 611 and a plurality of elastic telescopic columns 612; the middle part of the mounting plate 611 is connected to the synchronization rod 62, and the ultrasonic sensor 4 is disposed on the side of the mounting plate 611 facing the pipe wall; the plurality of elastic telescopic columns 612 are used to guide the mounting plate 611 to move and push the mounting plate to reset.

[0046] The ultrasonic sensor 4 is fixed to the side of the mounting plate 611 facing the pipe wall. The mounting plate 611 is connected to the arc-shaped plate 1 via an elastic telescopic column 612, and the synchronizing rod 62 is fixed to the middle of the mounting plate 611. In nitrogen cleaning detection mode, the mechanical linkage module 7 drives the synchronizing rod 62 to move. The synchronizing rod 62 pushes the mounting plate 611 to overcome the elastic force of the elastic telescopic column 612 and move linearly towards the pipe wall along the telescopic direction of the elastic telescopic column 612. The mounting plate 611 drives the ultrasonic sensor 4 to synchronously approach the pipe wall until the sensor is in contact with the pipe wall to achieve high-precision detection. After the detection is completed, the mechanical linkage module 7 releases the driving force on the synchronizing rod 62. The elastic force of the elastic telescopic column 612 pushes the mounting plate 611 to move linearly in the opposite direction along the original trajectory, causing the ultrasonic sensor 4 and the synchronizing rod 62 to reset and restore the normal monitoring spacing. The elastic telescopic column 612 has both guiding and resetting functions. It constrains the mounting plate 611 to move linearly, avoiding detection blind spots or spacing deviations caused by the displacement of the ultrasonic sensor 4. It also eliminates the need for an additional reset drive structure, simplifying the device linkage logic and reducing the failure rate.

[0047] Reference Figure 3 and Figure 9 As shown: The mechanical linkage module 7 includes two linkage components 71 and a drive component 72; the linkage components 71 are connected to the two tension adjustment components 5; the drive component 72 is connected to the two linkage components 71, and the tension adjustment components 5 are driven by the two linkage components 71 to adjust the tension of the distributed optical fiber 3.

[0048] In the normal monitoring mode, the drive component 72 does not operate, the linkage component 71 remains stationary, the tension adjustment component 5 has no drive input, and the distributed optical fiber 3 remains relaxed. In the nitrogen cleaning detection mode, the drive component 72 synchronously drives the two linkage components 71 to operate. The linkage components 71 transmit the driving force to the corresponding tension adjustment components 5, causing the tension adjustment components 5 on both sides to synchronously adjust the tension of the distributed optical fiber 3, ensuring that the tension force at the commutation point on both sides of the optical fiber is consistent. After the detection is completed, the drive component 72 reverses its operation, causing the tension adjustment components 5 to reset through the linkage components 71, and the optical fiber returns to relaxation. At the same time, the drive component 72 synchronously drives the stroke adjustment component 6 to reset, realizing the overall mode switching of the device. By synchronously driving the two linkage components 71 through the drive component 72, the synchronous operation of the tension adjustment components 5 on both sides is achieved, ensuring that the tension force at the commutation point on both sides of the distributed optical fiber 3 is uniform, avoiding damage or detection accuracy deviation caused by excessive force on one side of the optical fiber.

[0049] Reference Figure 9 , Figure 10 and Figure 11 As shown: The linkage component 71 includes a linkage plate 711, two linkage arms 712 and a guide component 713; the linkage plate 711 is connected to the drive component 72; the two linkage arms 712 are respectively disposed at both ends of the linkage plate 711, and the linkage arms 712 are connected to the tension adjustment component 5; the guide component 713 is used to guide the movement of the linkage plate 711.

[0050] Specifically, the guide assembly 713 includes a plurality of second guide rods 7131. The second guide rods 7131 penetrate vertically through the linkage plate 711 and are movably connected thereto. The second guide rods 7131 are fixedly connected to the arc-shaped fixing block 2. A spring 7132 is sleeved on the second guide rod 7131. The spring 7132 is used to provide a thrust to the linkage plate 711 toward the pipeline. A limiting plate 7133 is fixedly disposed on the second guide rod 7131. The limiting plate 7133 is used to limit the travel of the linkage plate 711 sliding along the second guide rod 7131.

[0051] In nitrogen cleaning and testing mode, the drive assembly 72 pushes the linkage plate 711 to slide along the second guide rod 7131 towards the arc-shaped fixed block 2. The spring 7132 releases its elastic potential energy, and the linkage plate 711, through the two linkage arms 712, simultaneously pushes the connecting blocks 511 on both sides to move along the first guide rod 53, thereby driving the tension adjustment assembly 5 to achieve fiber tension. The limit plate 7133 limits the maximum sliding stroke of the linkage plate 711 to prevent the fiber from being over-tensioned and damaged. After the test is completed, the drive assembly 72 releases the driving force, pushing the linkage plate 711 to slide back and reset along the second guide rod 7131. Through the linkage arms 712, the connecting blocks 511 and the tension adjustment assembly 5 are reset, and the fiber is relaxed again. The linkage assembly 71, through the cooperation of the linkage plate 711 and the linkage arms 712, realizes the synchronous transmission of the driving force of the drive assembly 72 to the tension adjustment assemblies 5 on both sides.

[0052] Reference Figure 9 and Figure 11 As shown: The linkage arm 712 is provided with a sliding groove 7121, which is connected to the stroke adjustment component 6.

[0053] Synchronizing rod 62 is slidably embedded in the groove 7121 of linkage arm 712, forming a transmission connection between linkage arm 712 and stroke adjustment component 6. In nitrogen purging detection mode, spring 7132 pushes linkage plate 711 to move along second guide rod 7131 toward the pipeline, causing linkage arm 712 to move synchronously. Under the constraint of groove 7121, synchronizing rod 62 moves with linkage arm 712, generating displacement perpendicular to the pipe wall. Synchronizing rod 62 drives connecting component 61 and ultrasonic sensor 4 to move closer to the pipe wall, realizing synchronous linkage of fiber tensioning and ultrasonic sensor 4 moving closer to the pipe wall. After detection, drive component 72 pushes linkage plate 711 to reset, linkage arm 712 moves in the opposite direction, groove 7121 drives synchronizing rod 62 to move in the opposite direction, driving stroke adjustment component 6 to reset, realizing synchronous reset of the two detection components. The mechanical linkage between linkage arm 712 and synchronizing rod 62 is realized through groove 7121, so that fiber tension adjustment and ultrasonic sensor 4 stroke adjustment are synchronously controlled by the same drive source, realizing complete synchronization of the switching action of the two detection modes.

[0054] Reference Figure 10 , Figure 12 and Figure 13 As shown: The drive assembly 72 includes a rotating shaft 721 and an adjustment and locking assembly 722; the rotating shaft 721 is connected to the two arc-shaped fixing blocks 2 through two bearing seats, and two cams 7211 are provided on the rotating shaft 721. The two cams 7211 are respectively connected to the two linkage assemblies 71 for transmission; the adjustment and locking assembly 722 is used to fix the rotating shaft 721.

[0055] Specifically, the adjustment and locking assembly 722 includes a sliding shaft 7221, a locking block 7222, and a positioning ring 7223. The sliding shaft 7221 is coaxially disposed inside the rotating shaft 721 and is slidably connected to the rotating shaft 721. The locking block 7222 is fixedly connected to the sliding shaft 7221. The positioning ring 7223 is disposed on the bearing seat and has two slots that cooperate with the locking block 7222.

[0056] The rotating shaft 721 is rotatably connected to the arc-shaped fixed block 2 via a bearing seat. The cam 7211 and the linkage plate 711 abut against each other. The sliding shaft 7221 is coaxially located inside the rotating shaft 721. The locking block 7222 is adapted to the slot of the positioning ring 7223. In normal monitoring mode, the locking block 7222 engages with the slot of the positioning ring 7223, locking the rotating shaft 721 and preventing it from rotating. The cam 7211 provides upward support to the linkage plate 711, keeping it in its initial position, and the device maintains normal monitoring status. When switching to nitrogen cleaning detection mode, the sliding shaft 7221 slides outward from the rotating shaft 721, causing the locking block 7222 to disengage from the slot, releasing the locking of the rotating shaft 721. The rotating shaft 721 drives two cams 7211 to rotate synchronously. The cams 7211 remove their supporting force on the linkage plate 711, causing the spring 7132 to push the linkage plate 711 to slide along the second guide rod 7131. This achieves the linkage action of fiber tensioning and the ultrasonic sensor 4 approaching the pipe wall. After adjusting to the preset position, the sliding shaft 7221 slides inward, and the locking block 7222 re-engages into the slot, locking the position of the rotating shaft 721 and ensuring the stability of the device's position during the detection process. After the detection is completed, the rotating shaft 721 is unlocked again, and the rotating shaft 721 is rotated in the opposite direction to reset the cams 7211. The cams 7211 push the linkage plate 711 to reset, relocking the rotating shaft 721, and the device returns to the normal monitoring mode. Adjusting the locking component 722 enables the locking and unlocking of the rotating shaft 721, ensuring that the detection device maintains a fixed mode in both modes and preventing mode changes due to pipe vibration.

[0057] The above embodiments only illustrate one or more implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A non-invasive marine methanol fuel pipeline leak detection device, characterized in that, It includes an arc plate (1), distributed optical fiber (3), multiple ultrasonic sensors (4), two tension adjustment components (5), stroke adjustment component (6) and mechanical linkage module (7); The inner arc surface of the arc plate (1) is attached to the outer wall of the pipeline. Multiple optical fiber placement slots (11) are opened on the arc plate (1). Multiple ultrasonic mounting slots (12) are opened on the arc plate (1). Arc-shaped fixing blocks (2) are fixed at both ends of the arc plate (1). The two ends of the distributed optical fiber (3) are respectively fixed to the two arc-shaped fixing blocks (2), and the middle part of the distributed optical fiber (3) is arranged in an S-shape in multiple optical fiber placement slots (11). Multiple ultrasonic sensors (4) are installed one-to-one in multiple ultrasonic mounting slots (12); The two tension adjustment components (5) are respectively located on both sides of the arc plate (1) and connected to the reversing point of the distributed optical fiber (3) to adjust the tension of the distributed optical fiber (3). The stroke adjustment component (6) is connected to the ultrasonic sensor (4) and is used to adjust the distance between the ultrasonic sensor (4) and the pipe wall; The mechanical linkage module (7) is connected to the two tension adjustment components (5) and the stroke adjustment component (6) in a transmission connection, and drives the two to move synchronously.

2. The non-invasive marine methanol fuel pipeline leak detection device according to claim 1, characterized in that, The tension adjustment assembly (5) includes a first mounting bracket (51) and a plurality of first pulleys (52); The first mounting bracket (51) is located on one side of the arc plate (1), and both ends of it are fixed with connecting blocks (511) that are connected to the mechanical linkage module (7). Multiple first pulleys (52) are spaced apart on the first mounting frame (51) and abut against the reversing point of the distributed optical fiber (3).

3. The non-invasive marine methanol fuel pipeline leak detection device according to claim 2, characterized in that, The tension adjustment assembly (5) further includes two first guide rods (53), which are respectively fixed at one end of the two arc-shaped fixing blocks (2), and their axes are parallel to the tangent of the arc-shaped plate (1). The connecting block (511) is slidably sleeved on the first guide rods (53).

4. The non-invasive marine methanol fuel pipeline leak detection device according to claim 3, characterized in that, The tension adjustment component (5) further includes a clamping component (54), which is located on the side of the first mounting frame (51) away from the arc plate (1). The clamping component (54) cooperates with the first mounting frame (51) and the first pulley (52) to clamp the distributed optical fiber (3).

5. A non-invasive marine methanol fuel pipeline leak detection device according to claim 1, characterized in that, The stroke adjustment assembly (6) includes multiple connecting components (61) and a synchronizing rod (62); Each of the multiple connecting components (61) is connected to a corresponding ultrasonic sensor (4); The synchronizing rod (62) is connected to a plurality of the connecting components (61), and the synchronizing rod (62) is connected to the mechanical linkage module (7).

6. The non-invasive marine methanol fuel pipeline leak detection device according to claim 1, characterized in that, The connecting assembly (61) includes a mounting plate (611) and a plurality of elastic telescopic columns (612). The middle part of the mounting plate (611) is connected to the synchronization rod (62), and the ultrasonic sensor (4) is disposed on the side of the mounting plate (611) facing the pipe wall; Multiple elastic telescopic columns (612) are used to guide the mounting plate (611) to move and push the mounting plate (611) to reset.

7. A non-invasive marine methanol fuel pipeline leak detection device according to claim 1, characterized in that, The mechanical linkage module (7) includes two linkage components (71) and a drive component (72). The linkage component (71) is connected to the two tension adjustment components (5); The drive component (72) is connected to the two linkage components (71), and the tension adjustment component (5) is driven by the two linkage components (71) to adjust the tension of the distributed optical fiber (3).

8. A non-invasive marine methanol fuel pipeline leak detection device according to claim 7, characterized in that, The linkage component (71) includes a linkage plate (711), two linkage arms (712), and a guide component (713). The linkage plate (711) is connected to the drive assembly (72) in a transmission manner; The two linkage arms (712) are respectively disposed at both ends of the linkage plate (711), and the linkage arms (712) are connected to the tension adjustment assembly (5); The guide component (713) is used to guide the movement of the linkage plate (711).

9. A non-invasive marine methanol fuel pipeline leak detection device according to claim 8, characterized in that, The linkage arm (712) is provided with a slide groove (7121), which is connected to the stroke adjustment component (6).

10. A non-invasive marine methanol fuel pipeline leak detection device according to claim 7, characterized in that, The drive assembly (72) includes a rotating shaft (721) and an adjustment and locking assembly (722). The rotating shaft (721) is connected to the two arc-shaped fixing blocks (2) through two bearing seats. Two cams (7211) are provided on the rotating shaft (721), and the two cams (7211) are respectively connected to the two linkage components (71) for transmission. The adjustment locking assembly (722) is used to fix the rotating shaft (721).

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