Nondestructive testing device for flexible vertical pipe

Abstract

The invention belongs to the technical field of flexible riser detection, and particularly relates to a nondestructive testing device for a flexible riser. Comprising a cohesion frame, a driving module and a detection module, and a plurality of first supporting wheels distributed in the circumferential direction and a plurality of joint arms distributed in the circumferential direction are arranged on the cohesion frame; wherein a first elastic piece is arranged on the joint arm, a second supporting wheel is further arranged on the joint arm, and the driving module comprises a driving motor arranged on the cohesion frame, a driving gear in driving connection with the driving motor, a helical fluted disc in transmission fit with the driving gear and a clamping ring coaxially fixed to the helical fluted disc; the bottom of the clamping ring is in rolling fit with the second supporting wheel, and the second supporting wheel transmits the elastic force of the elastic piece to the clamping ring. The detection device ingeniously integrates an axial thrust mechanism of helical gear transmission and an elastic self-adaptive structure, can autonomously and stably operate under complex ocean working conditions without depending on ROV or diver intervention, and remarkably improves detection efficiency, coverage integrity and operation safety.

Description

Technical Field

[0001] This invention belongs to the field of flexible riser testing technology, specifically relating to a non-destructive testing device for flexible risers. Background Technology

[0002] Flexible risers, as key transmission equipment in deep-sea oil and gas development, are widely used to connect subsea wellheads and floating production platforms, undertaking the important function of transporting various media such as crude oil, natural gas, water injection, and chemical reagents. Their structure is typically composed of multiple layers of composite materials, with the steel armor layer (including pressure armor and tensile armor layers) being the main load-bearing component. Existing in the complex marine environment for extended periods, they withstand internal fluid pressure, external hydrostatic pressure, dynamic bending moments caused by platform movement, and alternating loads from waves and ocean currents. Under the coupled effects of these multiple loads, the steel armor layer is prone to fatigue cracks, wire breakage, corrosion, and other damage. If these damages are not detected and addressed in a timely manner, they may lead to riser failure, media leakage, or even major safety accidents, seriously threatening the continuity and safety of offshore oil and gas production.

[0003] Currently, non-destructive testing of flexible risers mainly relies on manual operations, including visual inspection by divers, localized scanning by remotely operated underwater vehicles (ROVs) equipped with sensors, or fixed-point monitoring through temporary installation of fixed testing equipment. However, these methods have significant limitations: on the one hand, due to limitations in operating windows, water depth, and sea conditions, manual and ROV operations are costly and inefficient, making it difficult to achieve large-scale, high-frequency, and routine inspections of the entire riser; on the other hand, in areas with complex structures and limited space, such as offshore platforms, ROV operations are difficult and susceptible to interference, and manually deployed inspection paths often lack systematicity and repeatability, resulting in uneven distribution of inspection points and incomplete data coverage, affecting the accuracy and completeness of damage identification. Furthermore, frequent manual operations pose high safety risks and are inconsistent with the development trend of intelligent and unmanned marine engineering.

[0004] Although some crawling inspection devices have been proposed for pipeline inspection in recent years, most designs are geared towards onshore or rigid subsea pipelines and are ill-suited to the unique curvature variations, surface irregularities, and dynamic oscillation characteristics of flexible risers. Technical bottlenecks remain, particularly in achieving stable adhesion, reliable drive, and full-circumference coverage inspection. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a flexible riser non-destructive testing device that can automatically travel along the riser axis and simultaneously complete circumferential rotation without or with minimal reliance on ROV and diver intervention, thereby achieving full coverage, high precision, and routine non-destructive testing of the steel armor layer.

[0006] This application provides a non-destructive testing device for flexible risers, comprising: A clamping frame is provided with a plurality of first support wheels and a plurality of joint arms distributed circumferentially; wherein, a first elastic element is provided on the joint arm to provide a continuous upward bending force for the joint arm, and a second support wheel is also provided on the joint arm; The drive module includes a drive motor mounted on a clamping frame, a drive gear driven by the drive motor, a helical gear disk that is driven by the drive gear, and a clamping ring that is coaxially fixed with the helical gear disk; wherein, the bottom of the clamping ring is rolled in contact with the second support wheel, and the second support wheel transmits the elastic force of the elastic element to the clamping ring; The detection module is mounted on the clamping frame.

[0007] Optionally, the clamping ring includes multiple clamping segments, each clamping segment having a second rotating shaft and a second pin at both ends, the second rotating shaft having a second insert bolt, and adjacent clamping segments being laterally screwed to the second pin by the second insert bolt to achieve an adjustable connection.

[0008] Optionally, the helical toothed disc includes multiple helical tooth segments, which are fixed to the clamping segments one by one.

[0009] Optionally, the clamping frame includes a fixed frame and two movable frames respectively hinged to both sides of the fixed frame, with a latching structure connecting the two movable frames.

[0010] Optionally, the detection module includes multiple electromagnetic detectors and at least one electronic chamber. The multiple electromagnetic detectors are distributed on two movable frames. The electronic chamber is equipped with a controller and a power supply. The electronic chamber and the drive motor are mounted on the fixed frame.

[0011] Optionally, the latching structure includes a first connecting arm hinged to one of the movable frames, a first pin disposed at the end of the first connecting arm, a first rotating shaft disposed on the other movable frame, and a first insert bolt that passes laterally through the first rotating shaft and is laterally threaded to the first pin.

[0012] Optionally, both the fixed frame and the two movable frames are provided with at least two first support wheels distributed axially and at least one articulated arm located at the bottom end.

[0013] Optionally, a reinforcing connection structure is also connected between the two movable frames. The reinforcing connection structure includes a second connecting arm, a third connecting arm hinged to the second connecting arm, a second elastic element with one end connected to the second connecting arm, and a connecting hook that slides with the third connecting arm. The third connecting arm has an oblong hole, and one end of the connecting hook is provided with a positioning pin that passes through the oblong hole. The positioning pin is connected to the other end of the second elastic element. The second connecting arm and the third connecting arm are hinged to one movable frame at opposite ends, and the other end of the connecting hook is rotatably connected to the other movable frame.

[0014] Optionally, the latch structure further includes a positioning pin, which is fixedly connected to the first rotating shaft via a fixing plate, and the positioning pin is used to fix the first bolt.

[0015] Optionally, the first elastic element and / or the second elastic element are tension springs.

[0016] Optionally, the detection device further includes a cleaning module, which includes a cylindrical brush rotatably disposed inside the clamping frame and arranged axially, and a drive mechanism for driving the cylindrical brush.

[0017] Optionally, the drive module further includes a stroke detection encoder mounted on the clamping frame.

[0018] Optionally, the driving mechanism includes a drive motor and a transmission component connected to the output end of the drive motor, the transmission component being connected to the end of the cylindrical brush.

[0019] Optionally, the transmission component includes a drive sprocket disposed on the output shaft of the drive motor, a driven sprocket disposed at the end of the cylindrical brush, and a transmission chain connecting the drive sprocket and the driven sprocket.

[0020] Optionally, the transmission component includes a driving gear and at least one driven gear, the driving gear being disposed on the output shaft of the drive motor, and the driven gear being disposed at the end of the cylindrical brush.

[0021] The beneficial effects of this application are that multiple first support wheels arranged circumferentially on the clamping frame achieve adaptive clamping of the flexible riser, ensuring stable attachment of the device to the riser surface and effectively adapting to its curvature changes and dynamic oscillations. In the drive module, the drive motor drives the drive gear to rotate, meshing with the helical gear disk to form a helical gear transmission pair; during the rotation of the helical gear disk, the helical gear geometry generates a controllable axial force. This axial force is transmitted to the second support wheel via a clamping ring fixed coaxially to it, while the first elastic element on the articulated arm provides a continuous preload to the second support wheel, enabling the device to achieve a helical propulsion motion along the riser surface under the synergistic action of axial thrust and elastic reaction force, and simultaneously complete continuous rotation around the riser circumferentially. The detection module synchronously performs axial travel and circumferential scanning with the device, thereby achieving full-coverage, high-precision non-destructive testing of the steel armor layer. This detection device ingeniously integrates the axial thrust mechanism of helical gear transmission with an elastic adaptive structure. It can operate autonomously and stably in complex marine conditions without relying on ROV or diver intervention, significantly improving detection efficiency, coverage integrity and operational safety, and fully meeting the technical requirements for routine and intelligent detection of deep-water flexible risers. Attached Figure Description

[0022] Figure 1 A first-view structural schematic diagram of the flexible riser non-destructive testing device provided in an embodiment of this application; Figure 2 A second-view structural schematic diagram of the flexible riser non-destructive testing device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the clamping ring provided in an embodiment of this application; Figure 4 This is a schematic diagram of the combined structure of the helical toothed disk and the clamping ring provided in an embodiment of this application; Figure 5 A partial structural schematic diagram of the flexible riser non-destructive testing device provided in an embodiment of this application; Figure 6 A partial structural schematic diagram of the flexible riser non-destructive testing device provided in an embodiment of this application; Figure 7 This is a schematic diagram of the cleaning mechanism provided in an embodiment of this application.

[0023] In the diagram: 110, fixed frame; 120, movable frame; 130, latching structure; 131, first connecting arm; 132, first pin; 133, first rotating shaft; 134, first bolt; 135; 140, first support wheel; 150, articulated arm; 160, first elastic element; 170, second support wheel; 180, reinforced connecting structure; 181, second connecting arm; 182, third connecting arm; 183, second elastic element; 184. Connecting hook; 185. Waist-shaped hole; 186. Positioning pin; 210. Drive motor; 220. Drive gear; 230. Helical gear disc; 231. Helical gear segment; 240. Clamping ring; 241. Clamping segment; 242. Second rotating shaft; 243. Second pin shaft; 244. Second pin bolt; 250. Stroke detection encoder; 310. Electromagnetic detector; 320. Electronic compartment; 410. Cylindrical brush; 420. Transmission component. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] like Figure 1-7 As shown, the non-destructive testing device for flexible risers provided in this application includes: The clamping frame is provided with a plurality of first support wheels 140 and a plurality of articulated arms 150 arranged in a circumferential direction; wherein, the articulated arms 150 are provided with a first elastic element 160 for providing a continuous upward bending force to the articulated arms 150, and the articulated arms 150 are also provided with a second support wheel 170. The drive module includes a drive motor 210 mounted on a clamping frame, a drive gear 220 drivenly connected to the drive motor 210, a helical gear disk 230 that is driven and engaged with the drive gear 220, and a clamping ring 240 that is coaxially fixed with the helical gear disk 230; wherein, the bottom of the clamping ring 240 is in rolling engagement with a second support wheel 170, and the second support wheel 170 transmits the elastic force of the elastic element to the clamping ring 240; The detection module is mounted on the clamping frame.

[0026] Compared with existing technologies, the flexible riser non-destructive testing device provided in this application achieves adaptive clamping of the flexible riser through multiple first support wheels 140 arranged circumferentially on the clamping frame, ensuring stable attachment of the device to the riser surface and effectively adapting to its curvature changes and dynamic oscillations. In the drive module, the drive motor 210 drives the drive gear 220 to rotate, meshing with the helical gear disk 230 to form a helical gear transmission pair; during the rotation of the helical gear disk 230, a controllable axial force is generated due to the geometric characteristics of its helical teeth. This axial force is transmitted to the second support wheel 170 through the clamping ring 240 fixed coaxially with it, while the first elastic element 160 provided on the articulated arm 150 provides a continuous preload force to the second support wheel 170, enabling the device to achieve a helical propulsion motion along the riser surface under the synergistic action of axial thrust and elastic reaction force, and simultaneously complete continuous rotation around the riser circumferentially. The detection module performs axial travel and circumferential scanning synchronously with the device, thereby achieving full coverage and high-precision non-destructive testing of the steel armor layer. This detection device ingeniously integrates the axial thrust mechanism of helical gear transmission with an elastic adaptive structure. It can operate autonomously and stably in complex marine conditions without relying on ROV or diver intervention, significantly improving detection efficiency, coverage integrity and operational safety, and fully meeting the technical requirements for routine and intelligent detection of deep-water flexible risers.

[0027] In one possible implementation, such as Figure 3 As shown, the clamping ring 240 includes multiple clamping segments 241. Each clamping segment 241 has a second rotating shaft 242 and a second pin 243 at both ends. The second rotating shaft 242 is provided with a second pin bolt 244. Adjacent clamping segments 241 are laterally screwed to the second pin 243 by the second pin bolt 244 to achieve an adjustable connection.

[0028] Specifically, the clamping ring 240 adopts a segmented modular design, composed of multiple clamping segments 241 spliced ​​circumferentially. Each segment has a second rotating shaft 242 and a second pin 243 at both ends. By inserting a second pin bolt 244 through the second rotating shaft 242 and laterally screwing it to the second pin 243 of the adjacent segment, a detachable and adjustable hinged connection is formed. This not only facilitates the rapid on-site installation or removal of the device onto the flexible riser (without axial insertion), but also allows for fine-tuning of the inner diameter of the clamping ring 240 by adjusting the bolt preload or the relative position of the segments according to the manufacturing tolerances or local deformations of the riser's outer diameter. This ensures a good fit with the riser surface, improving clamping force and transmission stability. Simultaneously, the hinge between the segments allows for a certain degree of relative rotation, helping to adapt to local curvature changes and dynamic oscillations of the riser, enhancing the device's environmental adaptability and operational reliability under complex marine conditions. The number of clamping segments 241 can be 3, 4, 5 or 6, and there is no single limitation here.

[0029] In one possible implementation, such as Figure 4 As shown, the helical tooth disk 230 includes multiple helical tooth segments 231, which are fixed to the clamping segments 241 one by one.

[0030] Specifically, each helical tooth segment 231 precisely matches each clamping segment 241 of the clamping ring 240, thereby ensuring efficient power transmission and stability between the helical tooth disk 230 and the flexible riser. By decomposing the helical tooth disk 230 into multiple segments, the device can be flexibly adjusted according to the actual size and shape of the riser, enabling the entire testing equipment to better adapt to risers of different diameters or with irregular surfaces.

[0031] In one possible implementation, the clamping frame includes a fixed frame 110 and two movable frames 120 respectively hinged to both sides of the fixed frame 110, with a latching structure 130 connecting the two movable frames 120.

[0032] Specifically, two movable frames 120 are hinged to both sides of the fixed frame 110, forming an openable ring-shaped frame similar to a "clamp" or "C-shape." A latching structure 130 is provided between the free ends of the two movable frames 120 to reliably lock the device after it surrounds the flexible riser. This allows the testing device to be quickly installed or removed from any position on the riser by opening the movable frames 120 without needing to be inserted along the riser's axial direction, greatly improving the convenience and adaptability of on-site operations. At the same time, the latching structure 130 provides a stable closing force, ensuring that the clamping frame maintains a firm grip on the riser during testing, effectively resisting vibrations or displacements caused by platform movement and ocean current disturbances in the marine environment, and ensuring the stable operation of the drive module and the testing module and the accuracy of data acquisition.

[0033] In one possible implementation, the detection module includes multiple electromagnetic detectors 310 and at least one electronic compartment 320. The multiple electromagnetic detectors 310 are distributed on two movable frames 120. The electronic compartment 320 is equipped with a controller and a power supply. The electronic compartment 320 and the drive motor 210 are mounted on a fixed frame 110.

[0034] Specifically, multiple electromagnetic detectors 310 are distributed across two movable frames 120 to ensure full circumferential coverage detection of the flexible riser steel armor layer in the clamped state; the electronic cabin 320 is integrated and installed on the fixed frame 110, which houses the controller and power supply, used to collect and process electromagnetic detection signals and power the entire device; at the same time, the drive motor 210 is also fixed to the fixed frame 110, and the centralized layout with the electronic cabin 320 is beneficial for center of gravity stability and cable management.

[0035] It should be noted that the electromagnetic detector 310 employs eddy current detection technology, comprising an excitation coil and a detection coil. An alternating current is passed through the excitation coil, generating an alternating magnetic field within the riser. Under the influence of this magnetic field, eddy currents are generated in the riser. When defects such as corrosion or cracks exist in the riser's armor layer, the conductivity and permeability of the pipe change, affecting the magnitude and distribution of the eddy currents, which in turn causes a change in the induced electromotive force (EMF) in the detection coil. The detection coil transmits the EMF change signal to the data processing and analysis module. By analyzing and processing this signal, the presence, nature, and approximate location of defects in the pipe can be determined.

[0036] In one possible implementation, such as Figure 6 As shown, the latching structure 130 includes a first connecting arm 131 hinged to one of the movable frames 120, a first pin 132 disposed at the end of the first connecting arm 131, a first rotating shaft 133 disposed on the other movable frame 120, and a first pin bolt 134 that passes laterally through the first rotating shaft 133 and is laterally threaded to the first pin 132.

[0037] Specifically, after the two movable frames 120 close and surround the flexible riser, the operator swings the first connecting arm 131 to the aligned position and screws in the first pin bolt 134 to engage and lock it with the first pin shaft 132, thereby forming a stable and reliable closed-loop clamping force. This not only makes installation and disassembly convenient and requires no special tools, but also allows for adjustment of the clamping tightness through the thread preload, adapting to risers with different outer diameters or surface conditions. At the same time, the combination of hinged and threaded connections balances structural rigidity and assembly tolerance, maintaining the overall stability of the clamping frame under marine dynamic loads and ensuring that the device does not loosen or shift during the testing process.

[0038] In one possible implementation, the fixed frame 110 and the two movable frames 120 are each provided with at least two first support wheels 140 distributed axially and at least one articulated arm 150 located at the bottom end.

[0039] Specifically, the fixed frame 110 and the two movable frames 120 are each equipped with at least one articulated arm 150 with a second support wheel 170 at their bottom ends, forming a multi-point contact, multi-segment coordinated support and guide structure, which can improve the stability of the detection device during operation.

[0040] In one possible implementation, a reinforcing connection structure 180 is also connected between the two movable frames 120. The reinforcing connection structure 180 includes a second connecting arm 181, a third connecting arm 182 hinged to the second connecting arm 181, a second elastic member 183 connected to the second connecting arm 181 at one end, and a connecting hook 184 that slides with the third connecting arm 182. The third connecting arm 182 has an oblong hole 185. One end of the connecting hook 184 is provided with a positioning pin 186 that passes through the oblong hole 185. The positioning pin 186 is connected to the other end of the second elastic member 183. The second connecting arm 181 and the third connecting arm 182 are hinged to one movable frame 120 at both ends, and the other end of the connecting hook 184 is rotatably connected to the other movable frame 120.

[0041] Specifically, a reinforced connection structure 180 with buffering and adaptive adjustment functions is added between the two movable frames 120. When the clamping frame closes around the flexible riser, the second elastic element 183 provides pre-tension, causing the connecting hook 184 to slide along the oblong hole 185 and automatically adjust its position, thereby compensating for the relative displacement of the two movable frames 120 caused by deviations or deformations in the outer diameter of the riser. At the same time, the fit between the oblong hole 185 and the positioning pin 186 allows for a certain range of degrees of freedom. Combined with the buffering effect of the elastic element, it effectively absorbs the dynamic impact loads caused by platform movement or ocean currents in the marine environment, preventing the latching structure 130 from loosening due to overload. This not only improves the overall rigidity and vibration resistance of the clamping frame, but also enhances the adaptability of the device to the geometric changes of the riser under different working conditions, ensuring structural stability and reliable contact during the testing process, and providing strong support for high-precision non-destructive testing.

[0042] In one possible implementation, the latching structure 130 further includes a positioning pin 135, which is fixedly connected to the first rotating shaft 133 via a fixing plate. The positioning pin 135 is used to fix the first bolt 134. The positioning pin 135 ensures that the first bolt 134 remains horizontal when the latching structure 130 is open, facilitating tightening during subsequent assembly.

[0043] In one possible implementation, the first elastic element 160 and / or the second elastic element 183 are tension springs.

[0044] In one possible implementation, such as Figure 7 As shown, the detection device also includes a cleaning module, which includes a cylindrical brush 410 rotatably disposed inside the clamping frame and arranged axially, and a drive mechanism for driving the cylindrical brush 410.

[0045] Specifically, as the device moves along the flexible riser, the cylindrical brush 410 rotates at high speed under the drive mechanism, its bristles closely adhering to the outer surface of the riser, effectively removing attached marine organisms, sediment, rust, or other contaminants. This pre-emptive cleaning function allows for immediate cleaning of the steel armor layer surface before non-destructive testing, significantly improving the signal quality and defect identification accuracy of sensors such as the electromagnetic detector 310. Simultaneously, the axial arrangement of the cylindrical brush 410 coordinates with the device's helical propulsion motion, ensuring that the cleaning coverage area is synchronized with the testing area, preventing missed detections.

[0046] In one possible implementation, the drive module also includes a stroke detection encoder 250 mounted on the clamping frame.

[0047] Specifically, the stroke detection encoder 250 is mounted on the fixed frame 110 and is used to calculate the movement distance of the detection device by detecting the number of rotations of the first support wheel 140. The obtained stroke information not only provides an accurate spatial positioning reference for the detection data and realizes precise mapping of the defect location, but can also be fed back to the control system to adjust the speed of the drive motor 210 to ensure uniform speed movement and improve detection consistency; at the same time, in complex sea conditions, if slippage or jamming occurs, abnormal stroke can also serve as a basis for fault diagnosis.

[0048] In one possible implementation, the drive mechanism includes a drive motor, a transmission member 420 connected to the output end of the drive motor, and the transmission member 420 being connected to the end of the cylindrical brush 410.

[0049] Specifically, the transmission component 420 efficiently transmits the rotational power of the motor to the cylindrical brush 410, causing it to rotate at high speed around its own axis.

[0050] In one possible implementation, the transmission component 420 includes a drive sprocket disposed on the output shaft of the drive motor, a driven sprocket disposed at the end of the cylindrical brush 410, and a transmission chain connecting the drive sprocket and the driven sprocket.

[0051] Specifically, the transmission component 420 adopts a chain drive structure, which realizes power transmission through the driving sprocket on the output shaft of the drive motor, the driven sprocket at the end of the cylindrical brush 410, and the transmission chain connecting the two. It has the advantages of reliable transmission, strong load-bearing capacity, adaptability to large center distances, and non-slippage. Especially in the high humidity and high salt spray environment of the ocean, the chain drive is more corrosion-resistant and has a longer service life than the belt drive. It can stably drive the cylindrical brush 410 to rotate continuously, ensuring the consistency and durability of the cleaning effect.

[0052] In another possible implementation, the transmission element 420 includes a driving gear and at least one driven gear, the driving gear being disposed on the output shaft of the drive motor and the driven gear being disposed at the end of the cylindrical brush 410.

[0053] Specifically, the transmission component 420 adopts a gear transmission structure. By installing the driving gear on the output shaft of the drive motor and the driven gear on the end of the cylindrical brush 410, the power is directly and efficiently transmitted. The gear transmission has the advantages of compact structure, precise transmission ratio, rapid response and no need for tensioning mechanism, which can ensure stable rotation speed and good synchronization of the cylindrical brush 410, and improve the consistency and controllability of cleaning.

[0054] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0055] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A non-destructive testing device for flexible risers, characterized in that, include: A clamping frame is provided with a plurality of first support wheels (140) distributed circumferentially and a plurality of joint arms (150) distributed circumferentially; wherein, a first elastic element (160) is provided on the joint arm (150) for providing a continuous upward bending force to the joint arm (150), and a second support wheel (170) is also provided on the joint arm (150). The drive module includes a drive motor (210) mounted on a clamping frame, a drive gear (220) driven and connected to the drive motor (210), a helical gear disk (230) that is driven and engaged with the drive gear (220), and a clamping ring (240) that is coaxially fixed with the helical gear disk (230); wherein, the bottom of the clamping ring (240) is in rolling engagement with the second support wheel (170), and the second support wheel (170) transmits the elastic force of the elastic element to the clamping ring (240). The detection module is mounted on the clamping frame.

2. The flexible riser non-destructive testing device according to claim 1, characterized in that, The clamping ring (240) includes multiple clamping segments (241). Each clamping segment (241) has a second rotating shaft (242) and a second pin (243) at both ends. The second rotating shaft (242) is provided with a second insert bolt (244). Adjacent clamping segments (241) are laterally screwed to the second pin (243) by the second insert bolt (244) to achieve an adjustable connection.

3. The flexible riser non-destructive testing device according to claim 2, characterized in that, The helical toothed disc (230) includes multiple helical toothed segments (231), which are fixed to the clamping segments (241) one by one.

4. The non-destructive testing device for flexible risers according to claim 1, characterized in that, The clamping frame includes a fixed frame (110) and two movable frames (120) respectively hinged to both sides of the fixed frame (110), and a latching structure (130) is connected between the two movable frames (120).

5. The flexible riser non-destructive testing device according to claim 4, characterized in that, The detection module includes multiple electromagnetic detectors (310) and at least one electronic compartment (320). The multiple electromagnetic detectors (310) are distributed on two movable frames (120). The electronic compartment (320) is equipped with a controller and a power supply. The electronic compartment (320) and the drive motor (210) are mounted on the fixed frame (110). And / or, the latching structure (130) includes a first connecting arm (131) hinged to one of the movable frames (120), a first pin (132) disposed at the end of the first connecting arm (131), a first rotating shaft (133) disposed on the other movable frame (120), and a first pin bolt (134) that passes laterally through the first rotating shaft (133) and is laterally threaded to the first pin (132). And / or, both the fixed frame (110) and the two movable frames (120) are provided with at least two first support wheels (140) axially distributed and at least one articulated arm (150) located at the bottom end.

6. The non-destructive testing device for flexible risers according to claim 5, characterized in that, A reinforcing connection structure (180) is also connected between the two movable frames (120). The reinforcing connection structure (180) includes a second connecting arm (181), a third connecting arm (182) hinged to the second connecting arm (181), a second elastic element (183) connected to the second connecting arm (181) at one end, and a connecting hook (184) slidably engaged with the third connecting arm (182). The third connecting arm (182) has an oblong hole (185). One end of the connecting hook (184) is provided with a positioning pin (186) passing through the oblong hole (185). The positioning pin (186) is connected to the other end of the second elastic element (183). The second connecting arm (181) and the third connecting arm (182) are far apart from each other and are both hinged to one of the movable frames (120). The other end of the connecting hook (184) is rotatably connected to the other movable frame (120). And / or, the latch structure (130) further includes a positioning pin (135), which is fixedly connected to the first rotating shaft (133) by a fixing plate, and the positioning pin (135) is used to fix the first bolt (134).

7. The non-destructive testing device for flexible risers according to claim 6, characterized in that, The first elastic element (160) and / or the second elastic element (183) are tension springs.

8. The non-destructive testing device for flexible risers according to any one of claims 1-5, characterized in that, The detection device further includes a cleaning module, which includes a cylindrical brush (410) rotatably disposed inside the clamping frame and arranged axially, and a driving mechanism for driving the cylindrical brush (410). And / or, the drive module further includes a stroke detection encoder (250) disposed on the clamping frame.

9. The non-destructive testing device for flexible risers according to claim 8, characterized in that, The drive mechanism includes a drive motor and a transmission component (420) connected to the output end of the drive motor. The transmission component (420) is connected to the end of the cylindrical brush (410).

10. The non-destructive testing device for flexible risers according to claim 9, characterized in that, The transmission component (420) includes a drive sprocket disposed on the output shaft of the drive motor, a driven sprocket disposed at the end of the cylindrical brush (410), and a transmission chain connecting the drive sprocket and the driven sprocket. Alternatively, the transmission component (420) may include a drive gear and at least one driven gear, the drive gear being disposed on the output shaft of the drive motor and the driven gear being disposed at the end of the cylindrical brush (410).

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