Framework structure, flexible pipeline and machining method of flexible pipeline

Abstract

The invention relates to a skeleton structure, a flexible pipeline and a processing method thereof, the skeleton structure is assembled in the flexible pipeline, and the skeleton structure comprises a skeleton unit coaxially arranged in the flexible pipeline; the framework unit comprises a framework, and the framework extends in the circumferential direction of the flexible pipeline to form a spirally-wound S-shaped interlocking structure. A gap is formed in the framework in the axial direction of the flexible pipeline; the shielding unit comprises a shielding body, the shielding body is wound along the inner side of the framework to form a spiral structure, and the shielding body is attached to and embedded into the gap; the shielding body is positioned on the inner side of the skeleton unit; the shielding body comprises a shielding part and an extending part, the extending part is formed on the side, close to the gap, of the shielding part, and the extending part comprises at least two protrusions arranged in the thickness direction of the framework unit. The problems that in the prior art, operation is tedious and the effect is poor can be solved, the gap of the flexible pipeline framework is at least partially shielded, the flow-induced pulsation phenomenon is essentially restrained, the flow choking coefficient of a rough pipeline can be reduced, and the production efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of gas pipeline technology, and in particular to a skeleton structure, a flexible pipeline and its processing method. Background Technology

[0002] Deep-sea high-pressure flexible pipelines are key equipment for transporting marine oil and gas resources, enabling them to transport these resources in complex marine dynamic environments. Their unique composite material structure (comprising a skeleton layer, polymer sealing layer, and armor layer) gives them excellent bending resistance and dynamic response performance. However, under high-pressure gas transmission conditions, flow-induced pulsation is easily induced. This phenomenon is mainly formed by the periodic vortex patterns generated by gas flow in the gaps between the pipeline's internal skeleton. When the vortex shedding frequency approaches the natural frequency of the pipeline structure, it can cause significant pipeline vibration and pressure pulsation, leading to structural fatigue damage, noise radiation, and sealing failure at connection points, threatening the safe operation and service life of the pipeline system. In existing technologies, the main methods for suppressing flow-induced pulsation problems fall into two categories. One is to reduce the gas delivery velocity to weaken the vortex intensity and move it away from the natural frequency range of the pipeline, thereby avoiding the risk of resonance. The other is to inject non-reactive solvents such as ethylene glycol, methanol, or low-viscosity lubricating oil into the gas flow. The droplets can change the density and viscosity of the gas phase, interfere with the coherence of vortex generation, and disrupt its regular shedding rhythm, thereby weakening the amplitude of pressure pulsation and achieving the purpose of changing the flow field characteristics and suppressing vortex generation.

[0003] However, both of these existing methods have drawbacks. First, the reduced-speed operation directly leads to decreased transportation efficiency, reducing the production efficiency of oil and gas fields and resulting in direct economic losses, impacting production economics. Solvent injection, on the other hand, requires additional chemical storage, injection, and recovery systems, increasing design complexity, installation costs, and potential points of failure. Furthermore, the continuous procurement, storage, injection, and subsequent recovery of chemical reagents incurs operating expenses, increasing equipment investment and operating costs. Moreover, these methods heavily rely on real-time monitoring of parameters such as pipeline vibration, pressure, and flow rate, and require complex production control systems for dynamic control, further increasing system complexity and maintenance burden, while limiting their effectiveness in suppressing pollution. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a skeleton structure, a flexible pipe and its processing method. By setting a shielding structure with anti-flow-induced pulsation function in the skeleton, the problems of cumbersome operation and low efficiency in the prior art can be solved. By shielding at least part of the gaps in the flexible pipe skeleton, the generation of flow-induced pulsation is essentially suppressed, and the flow resistance coefficient of the rough pipe can be reduced, thereby further improving production efficiency.

[0005] To address the aforementioned technical problems, the present invention provides a skeleton structure, assembled inside a flexible pipe, the skeleton structure comprising, A skeleton unit is coaxially disposed within the flexible pipe; the skeleton unit includes a skeleton that extends circumferentially along the flexible pipe to form a spirally wound S-shaped interlocking structure; the skeleton has a gap along the axial direction of the flexible pipe. A shielding unit includes a shielding body that is wound into a spiral structure along the inner side of a frame and is attached to and embedded in the gap. The shielding body is located inside the frame unit. The shielding body includes a shielding portion and an extension portion. The extension portion is formed on the side of the shielding portion near the gap, and the end of the extension portion abuts against the frame. The extension portion includes at least two protrusions arranged along the thickness direction of the frame unit. The shielding portion and the extension portion cooperate to shield the gap.

[0006] In one embodiment of the present invention, the extension length of the extension portion is not greater than the length of the tangent of the bending radius of the skeleton located within the gap.

[0007] In one embodiment of the present invention, the extension includes a first protrusion and a second protrusion, the first protrusion and the second protrusion being formed at a distance from the shielding portion.

[0008] In one embodiment of the present invention, the height of the first protrusion is greater than the height of the second protrusion; or, the height of the first protrusion is equal to the height of the second protrusion.

[0009] In one embodiment of the present invention, along the circumferential direction of the skeleton unit, the end of the shielding portion is formed with a bent structure in a direction away from the skeleton.

[0010] In one embodiment of the present invention, the shielding body is made of a metallic material, and the hardness of the shielding body is lower than the hardness of the skeleton.

[0011] The present invention also provides a flexible pipe, including a skeleton structure as described above.

[0012] The present invention also provides a method for processing a skeleton structure, for processing a skeleton structure as described above, the processing method comprising, Step S1: Obtain a flat substrate; Step S2, the substrate is extruded to form a shielding body in a first state; the shielding body in the first state includes a shielding portion and an extension portion, the extension portion including at least two protrusions formed on one side of the shielding portion; Step S3: Obtain the skeleton, bend and process the skeleton to form a spirally wound S-shaped interlocking structure. During the skeleton forming process, insert and assemble the first state of the shielding body into the gap of the skeleton, so that the extension is embedded in the gap and the shielding part is in contact with the skeleton. The shielding body is wrapped around the inner side of the skeleton to form a spiral structure, thus forming the skeleton structure.

[0013] In one embodiment of the present invention, in step S2, the substrate is pressed by a guide positioning wheel, a first transmission roller and a second transmission roller to form a first protrusion and a second protrusion on the substrate to form the shielding body in a first state.

[0014] In one embodiment of the present invention, in step S3, during the skeleton forming process, the shielding body is wrapped around the jig, the first protrusion and the second protrusion are inserted into the gap of the skeleton, and the skeleton and the shielding body are squeezed to fix the shielding body to the skeleton.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: The present invention discloses a skeleton structure comprising a skeleton unit and a shielding unit. The skeleton unit includes a skeleton, which is an S-shaped interlocking structure extending circumferentially along a flexible pipe and spirally wound. A gap is formed in the skeleton along the axial direction of the flexible pipe. The shielding unit includes a shielding body, which is wound into a spiral structure along the inner side of the skeleton unit. Specifically, the shielding body includes a shielding portion and an extension portion. The extension portion is formed on the side of the shielding portion near the gap and includes at least two protrusions arranged along the thickness direction of the skeleton unit. During the skeleton forming process, the extension portion is attached to and embedded in the gap, and the shielding portion is in contact with the inner side of the skeleton. The gap is shielded by the mutual cooperation between the shielding portion and the extension portion. This invention achieves continuous and seamless shielding of the gaps by spirally winding and embedding the shielding body into the gaps of the skeleton. Even under dynamic conditions of bending and torsion, the shielding body will not break. Since the shielding part is mainly responsible for covering the planar area between the skeleton gaps, the protruding structure of the extension part can penetrate into the skeleton gaps and shield the gaps along the thickness direction of the skeleton. This allows the extension part and the gap to abut against each other through bending resistance. The bending resistance and the friction between the shielding body and the skeleton work together to achieve tight anchoring. The extension part provides anti-slip and anti-vibration along the axial direction of the skeleton and extrusion force along the radial direction of the skeleton, thereby effectively preventing relative slippage or peeling between the shielding body and the skeleton under repeated bending, vibration, or pressure pulsation, thus improving the service durability of the skeleton structure. In the specific implementation process, by adjusting the width, thickness, spiral pitch of the shielding body, and the number, shape, and height of the protrusions of the extension part, it can be flexibly adapted to skeletons of different specifications, realizing flexible production of the product. This invention incorporates a shielding body within the skeleton layer to effectively conceal the gaps in the skeleton, thereby eliminating or suppressing eddy current changes within the original skeleton gaps. This reduces vibration, noise, and the impact of flow-induced pulsations on the flexible pipe structure and production process. Furthermore, the skeleton structure of this invention reduces pipe friction resistance and pressure loss without affecting the flexible pipe's bending performance, effectively improving the medium's transport efficiency. In addition, this invention has a simple structure, a straightforward assembly process, and is easy to produce and assemble, making it readily applicable and solving the problems of cumbersome operation, low suppression effect, and high cost in existing technologies. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the skeleton structure of a preferred embodiment of the present invention.

[0018] Figure 2 yes Figure 1Enlarged diagram of point A in the middle.

[0019] Figure 3 This is a schematic diagram of the structure of the shielding body according to a preferred embodiment of the present invention.

[0020] Figure 4 yes Figure 3 Enlarged diagram of point B in the middle.

[0021] Figure 5 This is a schematic diagram of the skeleton of a preferred embodiment of the present invention.

[0022] Figure 6 This is a cross-sectional structural diagram of the skeleton according to a preferred embodiment of the present invention.

[0023] Figure 7 yes Figure 6 Enlarged diagram of point C in the middle.

[0024] Figure 8 This is a cross-sectional view of the overall structure of the skeleton structure of the preferred embodiment of the present invention.

[0025] Figure 9 This is a cross-sectional view of the overall structure of the skeleton structure of the preferred embodiment of the present invention, in the second embodiment (including the bending structure).

[0026] Figure 10 This is a schematic diagram of step S2 of the processing method according to a preferred embodiment of the present invention.

[0027] Figure 11 This is a schematic diagram of the processing steps of a preferred embodiment of the present invention.

[0028] Figure 12 This is a schematic diagram of the processing steps of a preferred embodiment of the present invention.

[0029] Figure 13 This is a schematic diagram of the processing steps of a preferred embodiment of the present invention.

[0030] Explanation of reference numerals on the accompanying drawings: 1. Frame; 10. Gap; 11. Frame body; 12. First connecting part; 13. Second connecting part; 14. Pre-tightening structure; 2. Shielding body; 21. Shielding part; 210. Bending structure; 22. Extension part; 221. First protrusion; 222. Second protrusion; 31. Guide positioning wheel; 32. First transfer roller; 33. Second transfer roller. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0032] In existing technologies, the main methods for suppressing flow-induced pulsation are external intervention or sacrificing economic performance, without fundamentally redesigning or improving the internal structure of the pipeline. Therefore, this invention aims to suppress or eliminate the generation of periodic vortices from the source by setting a shielding structure with anti-flow-induced pulsation function in the skeleton layer. Example 1

[0033] Reference Figures 1 to 13 As shown, the present invention discloses a skeleton structure assembled inside a flexible pipe, which can be used to transport liquid or gaseous media.

[0034] Specifically, the skeleton structure includes skeleton units, which are coaxially disposed within the flexible pipe; The skeleton unit includes a skeleton 1, which extends circumferentially along the flexible pipe to form a spirally wound S-shaped interlocking structure; and, along the axial direction of the flexible pipe, the skeleton 1 has a gap 10. Furthermore, the skeleton structure also includes a shielding unit, which includes a shielding body 2. The shielding body 2 is wound along the inner side of the skeleton 1 to form a spiral structure. The shielding body 2 is attached to and embedded in the gap 10. At the same time, the shielding body 2 is arranged on the inner side of the skeleton unit. In detail, the shielding body 2 includes a shielding part 21 and an extension part 22. The extension part 22 is formed on the side of the shielding part 21 near the gap 10. The end of the extension part 22 abuts against the skeleton 1. The extension part 22 includes at least two protrusions arranged along the thickness direction of the skeleton unit. The shielding portion 21 cooperates with the extension portion 22 to shield the gap 10.

[0035] Therefore, it can be understood that the skeleton structure to be protected by the present invention includes a skeleton unit and a shielding unit. The skeleton unit includes a skeleton, which is an S-shaped interlocking structure that extends circumferentially along the flexible pipe and is spirally wound. A gap is formed in the skeleton along the axial direction of the flexible pipe. The shielding unit includes a shielding body, which is wound along the inner side of the skeleton unit to form a spiral structure. Specifically, the shielding body includes a shielding part and an extension part. The extension part is formed on the side of the shielding part near the gap. The extension part includes at least two protrusions arranged along the thickness direction of the skeleton unit. During the skeleton forming process, the extension part is attached to and embedded in the gap, and the shielding part is in contact with the inner side of the skeleton. The gap is shielded by the mutual cooperation between the shielding part and the extension part. This invention achieves continuous and seamless shielding of the gaps by spirally winding and embedding the shielding body into the gaps of the skeleton. Even under dynamic conditions of bending and torsion, the shielding body will not break. Since the shielding part is mainly responsible for covering the planar area between the skeleton gaps, the protruding structure of the extension part can penetrate into the skeleton gaps and shield the gaps along the thickness direction of the skeleton. This allows the extension part and the gap to abut against each other through bending resistance. The bending resistance and the friction between the shielding body and the skeleton work together to achieve tight anchoring. The extension part provides anti-slip and anti-vibration along the axial direction of the skeleton and extrusion force along the radial direction of the skeleton, thereby effectively preventing relative slippage or peeling between the shielding body and the skeleton under repeated bending, vibration, or pressure pulsation, thus improving the service durability of the skeleton structure. In the specific implementation process, by adjusting the width, thickness, spiral pitch of the shielding body, and the number, shape, and height of the protrusions of the extension part, it can be flexibly adapted to skeletons of different specifications, realizing flexible production of the product. This invention incorporates a shielding body within the skeleton layer. By effectively shielding the gaps in the skeleton, the shielding body eliminates or suppresses changes in the original eddy currents within the skeleton gaps. This reduces vibration, noise, and the impact of flow-induced pulsations on the flexible pipe structure and production process. Furthermore, the skeleton structure of this invention reduces pipe friction resistance and pressure loss without affecting the bending performance of the flexible pipe, effectively improving the medium transport efficiency. In addition, this invention has a simple structure, a straightforward assembly process, and is easy to produce and assemble, making it readily applicable and solving the problems of cumbersome operation, low suppression effect, and high cost in existing technologies.

[0036] In a preferred embodiment, the end of the extension 22 abuts against the skeleton 1.

[0037] In a preferred embodiment, the extension length of the extension 22 is no greater than the length of the tangent to the bending radius of the skeleton 1 within the gap 10. This arrangement prevents interference between the edge of the skeleton 1 and the extension 22 after bending.

[0038] In one embodiment, the shielding portion 21 and the extension portion 22 are integrally formed, and the extension portion 22 is formed on the shielding portion 21 by extrusion processing; of course, in other embodiments, the shielding portion 21 and the extension portion 22 can also be independent structures, and the extension portion 22 is fixed to the shielding portion 21 by welding or other mechanical connection.

[0039] In detail, the shielding portion 21 and the extension portion 22 cooperate to form a "π-shaped" structure. Specifically, the extension portion 22 includes a first protrusion 221 and a second protrusion 222, which are spaced apart on the shielding portion 21. Thus, the first protrusion 221, the second protrusion 222, and the shielding portion 21 cooperate to form a structure similar to a "π-shape". Simultaneously, the first protrusion 221 and the second protrusion 222 are located on the same side of the shielding portion 21, allowing them to fit tightly into the gap 10. This configuration creates a double-sided anchoring structure. The first protrusion 221 and the second protrusion 222 form two independent support and contact points within the gap 10, effectively creating a "double-point anchor" in the thickness direction of the skeleton 1. This design more effectively limits the left-right swaying (tilting) and forward-backward movement of the shield 2 within the gap 10 compared to a single protrusion, thus forming a stable clamp. Furthermore, the "π-shaped" structure essentially forms a three-point clamping and support for the skeleton 1 at both ends of the shield 21 and the ends of the two protrusions, further locking the shield 2 to the skeleton 1. When the flexible pipe bends, the gap 10 will change accordingly, optimizing stress distribution and load-bearing capacity. Moreover, the double-protrusion structure can distribute the shear force and peeling force acting on the shield 2 to the two protrusions, avoiding stress concentration at a single point, thereby reducing the risk of deformation or damage to the shield 2 and improving the overall structural durability and fatigue resistance.

[0040] In one embodiment, the height of the first protrusion 221 is greater than the height of the second protrusion 222. This arrangement creates a height difference between the first protrusion 221 and the second protrusion 222, ensuring that the end of the higher first protrusion 221 contacts the frame 1 first, providing guidance and initial positioning during assembly and facilitating subsequent assembly. Furthermore, when the frame 1 bends or vibrates, causing unevenness in the gap 10, the protrusions of different heights can better adapt to this change, ensuring that at least one protrusion remains in contact with the frame 1. The higher first protrusion 221 provides primary support, while the lower second protrusion 222 serves as auxiliary support, thereby optimizing stress distribution. Of course, in some other embodiments, the first protrusion 221 and the second protrusion 222 can also be set to the same height. This can improve the force balance of the first protrusion 221 and the second protrusion 222, making the force symmetrical and improving the stability of the structure. The symmetrical structure makes the mold structure simpler during manufacturing, thus facilitating production and reducing the complexity of the molding process and processing costs. In addition, the symmetrical structural design can improve assembly efficiency, eliminating the need to distinguish the installation direction.

[0041] In a preferred embodiment, along the circumferential direction of the skeleton unit, the end of the shielding part 21 is bent away from the skeleton 1 to form a bent structure 210. This prevents the end of the shielding part 21 from rigidly colliding with the skeleton 1 when the flexible pipe undergoes dynamic changes such as torsion due to vibration or disturbance, thus avoiding interference and preventing the shielding body 2 from detaching from the gap 10.

[0042] Preferably, the shielding body 2 is made of a metallic material, and the hardness of the shielding body 2 is lower than that of the frame 1. Furthermore, in order to increase the mechanical interlocking friction between the shielding body 2 and the frame 1, the surface of the shielding body 2 is roughened, and the roughening treatment includes, but is not limited to, sandblasting.

[0043] The following further elaborates on the helical winding S-shaped interlocking structure of the skeleton 1: The skeleton 1 is formed by bending to form a skeleton body 11, a first connecting part 12 and a second connecting part 13, with the first connecting part 12 and the second connecting part 13 respectively formed at both ends of the skeleton body 11.

[0044] Along the thickness direction of the skeleton 1, the first connecting part 12 and the second connecting part 13 have a reverse arc-shaped bending structure; during the bending process of the skeleton 1 to form a spirally wound S-shaped interlocking structure, along the circumferential direction of the skeleton unit, the previous second connecting part 12 and the next first connecting part 11 are interlocked (clamped) with each other, and are tightly connected in sequence, thereby forming a spirally wound S-shaped interlocking structure of the skeleton 1.

[0045] In detail, along the axial direction of the skeleton unit, a gap 10 is formed between the previous skeleton body 10 and the next first connecting part 12, and the shielding body 2 is embedded in the gap 10.

[0046] Specifically, in combination Figure 8As shown, the shielding part 21 is attached to the first connecting part 12 and the second connecting part 13 of the frame 1, and the extension part 22 abuts against the curved edge of the frame body 11 and the first connecting part 12.

[0047] In addition, in order to further improve the stability of the skeleton 1 structure, the end of the second connecting part 13 is bent inward to form a pre-tightening structure 14, and the second connecting part 13 is tightly engaged with the first connecting part 11 through the pre-tightening structure 14. Example 2

[0048] The present invention also discloses a flexible pipe, including a skeleton structure as described in Embodiment 1. Example 3

[0049] This invention also discloses a method for processing a skeleton structure, with reference to Figures 10 to 13 As shown, a method for processing a skeleton structure as described in Embodiment 1 includes, Step S1: Obtain a flat substrate; Step S2, the substrate is extruded to form a shielding body 2 in a first state; the shielding body 2 in the first state includes a shielding portion 21 and an extension portion 22, the extension portion 22 including at least two protrusions formed on one side of the shielding portion 21; Step S3: Obtain the skeleton 1, bend and process the skeleton 1 to form a spirally wound S-shaped interlocking structure. During the forming process of the skeleton 1, insert and assemble the shielding body 2 in the first state into the gap 10 of the skeleton 1, so that the extension 22 is embedded in the gap 10, and at the same time, the shielding part 21 is tightly attached to the edge of the skeleton 1. The shielding body 2 is bent so that it forms a spiral structure around the inner side of the frame 1; Finally, the aforementioned skeleton structure is formed.

[0050] In a preferred embodiment, in step S2, a guide positioning wheel, a first transmission roller 31, a second transmission roller 32, and a positioning seat are provided. The substrate is placed on the positioning seat, and then the substrate is squeezed by the guide positioning wheel 31, the first transmission roller 32, and the second transmission roller 33. Specifically, the positioning seat is provided with two parallel positioning plates. The base plate is pressed down by the guide positioning wheel 31, which is located between the two positioning plates and rolls continuously. The first transmission roller 32 and the second transmission roller 33 are located on both sides of the guide positioning wheel and on the outer side of the two positioning plates. The base plate is squeezed by the continuous rolling of the first transmission roller 32 and the second transmission roller 33 to form an extension 22 with a "π" structure, namely the first protrusion 221 and the second protrusion 222, thereby obtaining the shielding body 2 in the first state.

[0051] In a preferred embodiment, in step S3, during the forming process of the skeleton 1, the shielding body 2 in the first state is wrapped around the jig, the first protrusion 221 and the second protrusion 222 are inserted into the gap 10 of the skeleton 1, and the skeleton 1 and the shielding body 2 are squeezed to fix the shielding body 2 to the skeleton 1.

[0052] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A skeleton structure, characterized in that: The skeleton structure, assembled inside the flexible pipe, includes: A skeleton unit is coaxially disposed within the flexible pipe; the skeleton unit includes a skeleton that extends circumferentially along the flexible pipe to form a spirally wound S-shaped interlocking structure; the skeleton has a gap along the axial direction of the flexible pipe. A shielding unit includes a shielding body that is wound into a spiral structure along the inner side of a skeleton unit and is attached to and embedded in the gap. The shielding body is located inside the skeleton unit. The shielding body includes a shielding portion and an extension portion. The extension portion is formed on the side of the shielding portion near the gap, and the end of the extension portion abuts against the skeleton unit. The extension portion includes at least two protrusions arranged along the thickness direction of the skeleton unit. The shielding portion and the extension portion cooperate to shield the gap.

2. The skeleton structure according to claim 1, characterized in that: The extension length of the extension portion is not greater than the length of the tangent to the bending radius of the skeleton within the gap.

3. The skeleton structure according to claim 1, characterized in that: The extension includes a first protrusion and a second protrusion, which are spaced apart and formed in the shielding portion.

4. The skeleton structure according to claim 3, characterized in that: The height of the first protrusion is greater than the height of the second protrusion; or, the height of the first protrusion is equal to the height of the second protrusion.

5. A skeleton structure according to claim 1, characterized in that: Along the circumferential direction of the skeleton unit, the end of the shielding part has a bent structure in the direction away from the skeleton.

6. A skeleton structure according to any one of claims 1-5, characterized in that: The shield is made of metal and its hardness is lower than that of the skeleton.

7. A flexible pipe, characterized in that: Includes a skeleton structure as described in any one of claims 1-6.

8. A method for processing a skeleton structure, characterized in that: The method for processing a skeleton structure as described in any one of claims 1-6 includes... Step S1: Obtain a flat substrate; Step S2, the substrate is extruded to form a shielding body in a first state; the shielding body in the first state includes a shielding portion and an extension portion, the extension portion including at least two protrusions formed on one side of the shielding portion; Step S3: Obtain the skeleton, bend and process the skeleton to form a spirally wound S-shaped interlocking structure. During the skeleton forming process, insert and assemble the first state of the shielding body into the gap of the skeleton, so that the extension is embedded in the gap and the shielding part is in contact with the skeleton. The shielding body is wrapped around the inner side of the skeleton to form a spiral structure, thus forming the skeleton structure.

9. The method for processing a skeleton structure according to claim 8, characterized in that: In step S2, the substrate is pressed by a guide positioning wheel, a first transfer roller, and a second transfer roller to form a first protrusion and a second protrusion on the substrate, thereby forming the shielding body in the first state.

10. A method for processing a skeleton structure according to claim 8, characterized in that: In step S3, during the skeleton forming process, the shielding body is wrapped around the jig, the first protrusion and the second protrusion are inserted into the gap of the skeleton, and the skeleton and the shielding body are squeezed to fix the shielding body to the skeleton.

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