A corrosion-resistant butterfly-shaped optical cable

Abstract

This invention relates to the field of optical cable technology, and more particularly to a corrosion-resistant butterfly-shaped optical cable. It includes: a sheath, within which multiple steel wires are embedded; a fiber core is embedded in the center of the sheath; multiple anchor frames are evenly distributed on the steel wires; each anchor frame has a fixing part and a sliding part; the fixing part is fixedly connected to an adjacent steel wire; the anchor frame is embedded within the sheath, and the anchor frame enhances the bonding strength between the steel wires and the sheath. This invention utilizes the anchor frames embedded within the sheath as anchor points, enhancing the mechanical interlocking effect between the steel wires and the sheath, thereby suppressing relative slippage between the sheath and the steel wires, thus reducing the probability of the fiber core directly bearing tensile stress and maintaining normal communication of the fiber core; combined with a waterproof coating on the outer surface of the sheath, it reduces the probability of rainwater eroding the fiber core, providing double protection for the fiber core.

Description

Technical Field

[0001] This invention relates to the field of optical cable technology, and more particularly to a corrosion-resistant butterfly-shaped optical cable. Background Technology

[0002] A butterfly-shaped optical cable is a flat, indoor / outdoor dual-purpose cable containing steel wires (or FRP) and optical fibers. During installation and use, factors such as pulling during perforation and wiring, improper force at fixing points, overly tight bundling, temperature cycling, and long-term mechanical stress can cause relative slippage between the sheath and the steel wires. This slippage directly undermines the overall stability of the cable structure, forcing the normally buffered and protected optical fibers to directly bear external stress, leading to increased fiber attenuation, degraded transmission performance, and in extreme cases, fiber breakage. Simultaneously, slippage weakens the overall mechanical protection of the cable, accelerating the wear, cracking, and damage of the sheath. Ultimately, this accumulated damage not only directly affects the transmission quality and reliability of network signals but also significantly shortens the cable's lifespan. Summary of the Invention

[0003] This invention provides a corrosion-resistant butterfly optical cable to overcome the shortcomings of existing installations and uses, which can easily lead to relative slippage between the sheath and the steel wires of the butterfly optical cable, resulting in a reduction in the service life of the optical cable.

[0004] The technical implementation of the present invention is as follows: a corrosion-resistant butterfly optical cable, comprising: a sheath, wherein a plurality of steel wires are embedded in the sheath, a fiber core is embedded in the center of the sheath, the steel wires are provided with a plurality of equally spaced anchor frames, the anchor frames are provided with a fixing part and a sliding part, the fixing part is fixedly connected to the adjacent steel wire, the anchor frames are embedded in the sheath, and the anchor frames are used to enhance the bonding strength between the steel wires and the sheath;

[0005] A flexible sleeve is fixed inside the anchoring frame. The anchoring frame is made of elastic metal. The structural stiffness of the anchoring frame is less than that of the sheath. The anchoring frame is used to provide a margin for changes in the volume of the sheath.

[0006] A support portion is provided on the side of the sliding portion near the adjacent fixing portion. The support portion is used to contact the flexible sleeve to limit the maximum deformation of the anchoring frame.

[0007] Furthermore, the number of steel wires is four, and the projections of the four steel wires on the cross-section of the sheath form an isosceles trapezoid, the geometric center of which is located on the central axis of the fiber core.

[0008] Furthermore, each of the two steel wires distributed diagonally is provided with a number of spiral components, which are located between two adjacent anchoring frames on the same steel wire, and both ends of the spiral components are fixedly connected to the adjacent steel wires.

[0009] Furthermore, both the spiral component and the flexible sleeve are made of non-metallic materials.

[0010] Furthermore, the anchoring skeletons on any two non-diagonal steel wires are staggered.

[0011] Furthermore, the sliding portions on any two non-diagonal steel wires are oriented in opposite directions relative to the adjacent fixed portions.

[0012] Furthermore, the distance between any two of the steel wires is greater than the diameter of the fiber core.

[0013] Furthermore, the sheath contains multiple sets of buffer cavities that are equidistantly distributed near the fiber core, with each set of buffer cavities comprising two symmetrically distributed cavities.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention utilizes the anchoring skeleton embedded in the sheath as an anchor point to enhance the mechanical interlocking effect between the steel wire and the sheath, thereby suppressing the relative slippage between the sheath and the steel wire, thus reducing the probability of the fiber core directly bearing tensile stress and maintaining the normal communication of the fiber core; combined with the waterproof coating on the outer side of the sheath, it reduces the probability of rainwater eroding the fiber core and provides double protection for the fiber core.

[0015] By utilizing the flexible sleeve and the anchoring skeleton to form a cavity on the steel wire, and by using the anchoring skeleton to anchor the sheath instead of the traditional method of bonding the sheath to the steel wire, the sheath can adapt to the trend of thermal expansion and contraction, thereby reducing the tensile and compressive stresses borne by the sheath due to thermal expansion and contraction, thus reducing the probability of fatigue cracking and plastic deformation of the sheath and extending the service life of the sheath.

[0016] The bending strength of the butterfly optical cable is divided into three stages according to the bending amplitude by relying on the anchor frame and the helical component. During normal use and installation, the elastic deformation of the anchor frame reduces the bending strength of the butterfly optical cable, improves its flexibility, and facilitates perforation and wiring operations. When part of the butterfly optical cable is suspended, the sheath's own structural rigidity suppresses the bending of the cable, keeping the fiber core within the minimum bending radius. When the suspended part of the butterfly optical cable is swayed by wind, causing the bending amplitude to increase, the sheath's own structural rigidity buffers the bending behavior, and the helical component acts as the final guarantee, reducing the probability of excessive bending of the suspended butterfly optical cable. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the fiber core and anchoring frame of the present invention;

[0019] Figure 3 This is a three-dimensional structural diagram of the steel wire and anchoring frame of the present invention;

[0020] Figure 4 This is a three-dimensional structural cross-sectional view of the anchoring skeleton and flexible sleeve of the present invention;

[0021] Figure 5 This is a three-dimensional structural cross-sectional view of the sheath and buffer cavity of the present invention.

[0022] In the above attached diagram: 1-Sheath, 2-Steel wire, 3-Fiber core, 301-Buffer cavity, 4-Anchoring skeleton, 401-Fixing part, 402-Sliding part, 403-Supporting part, 5-Flexible sleeve, 6-Spiral component. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that this article is appended. Figure 2 Let's take the perspective of [the person in question] as an example to describe it.

[0025] Example 1

[0026] This embodiment provides a corrosion-resistant butterfly-shaped optical cable to improve the firmness of the bond between the sheath 1 and the steel wire 2.

[0027] See Figures 1 to 4 A corrosion-resistant butterfly-shaped optical cable includes: a sheath 1, the outer surface of which is provided with a waterproof coating to reduce the probability of the sheath 1 being corroded by rainwater; multiple steel wires 2 are embedded inside the sheath 1, the sheath 1 and the steel wires 2 are not adhered to each other and can slide relative to each other, a fiber core 3 is embedded in the middle of the sheath 1, and multiple anchor frames 4 are provided on the steel wires 2 at equal intervals. The anchor frames 4 are provided with a fixing part 401 and a sliding part 402 on the left and right sides respectively. The diameter of the fixing part 401 is the same as the diameter of the steel wire 2. The anchor frames 4 are fixed to the steel wires 2 through the fixing part 401. The diameter of the sliding part 402 is larger than the diameter of the steel wire 2, so that the sliding part 402 can move relative to the steel wire 2; the anchor frames 4 are embedded in the sheath 1 and are used to enhance the bonding strength between the steel wires 2 and the sheath 1.

[0028] The above settings enable the anchor frame 4 to be embedded in the sheath 1 as an anchor point, thereby enhancing the mechanical interlocking effect between the steel wire 2 and the sheath 1, thus suppressing the relative slippage between the sheath 1 and the steel wire 2, thereby reducing the probability that the fiber core 3 will directly bear tensile stress and maintaining the normal communication of the fiber core 3; combined with the waterproof coating on the outer side of the sheath 1, it reduces the probability of rainwater eroding the fiber core 3, providing double protection for the fiber core 3.

[0029] It should be noted that in this embodiment, the number of steel wires 2 is determined according to the weight per unit length of the butterfly optical cable, so that the steel wires 2 can withstand a tensile force greater than the weight of the butterfly optical cable.

[0030] See Figure 3 and Figure 4 The anchoring frame 4 is fixed with a flexible sleeve 5. The flexible sleeve 5 is a thermoplastic polyester elastomer, which has elasticity and high temperature resistance, so that the flexible sleeve 5 can provide a margin for the expansion of the sheath 1 in both axial and radial directions. The anchoring frame 4 is made of shape memory alloy and has elasticity. The structural stiffness of the anchoring frame 4 is less than that of the sheath 1. When the temperature of the sheath 1 reaches the lowest point it can withstand, the volume of the sheath 1 shrinks to the minimum. At this time, the elasticity of the anchoring frame 4 disappears and the shape is restored.

[0031] The above setup enables the flexible sleeve 5 and the anchoring skeleton 4 to form a cavity on the steel wire 2, and the anchoring skeleton 4 to anchor the sheath 1 instead of the traditional method of bonding the sheath 1 to the steel wire 2. This allows the sheath 1 to adapt to the trend of thermal expansion and contraction, thereby reducing the tensile and compressive stresses borne by the sheath 1 due to thermal expansion and contraction, thus reducing the probability of fatigue cracking and plastic deformation of the sheath 1 and extending the service life of the sheath 1.

[0032] The production process of this butterfly-shaped optical cable is as follows: the anchor frame 4 is flattened and its outer contour is plastically deformed so that the support part 403 abuts against the fixing part 401 and is held in this state; the fixing part 401 is fixed to the steel wire 2 by spot welding; the steel wire 2 and the fiber core 3 are passed through the extruder and formed into a butterfly-shaped optical cable by the extruder, and the butterfly-shaped optical cable is shaped by air cooling or water cooling.

[0033] When the extruder wraps the molten sheath 1 around the steel wire 2 and fiber core 3, the anchor frame 4 is in a flattened state. When the molten sheath 1 wraps the anchor frame 4, the anchor frame 4 and the sheath 1 exchange heat and tend to restore their shape. At this time, the sheath 1 is rapidly cooled and shaped, the volume of the sheath 1 decreases, and the shape of the anchor frame 4 is restored. Thus, the production of the butterfly optical cable is completed. At room temperature, the sheath 1 of this butterfly optical cable is always in a state of thermal expansion, and the anchor frame 4 is compressed and in a state of energy storage.

[0034] During use, when the sheath 1 is heated and expands, the anchor frame 4 is squeezed and the compressive stress of the sheath 1 is released. When the sheath 1 is cooled and contracts, the anchor frame 4 releases its elasticity and recovers and follows the contraction of the sheath 1. The sheath 1 slides relative to the steel wire 2 to reduce the tensile stress borne by the sheath 1.

[0035] Example 2

[0036] This embodiment provides an corrosion-resistant butterfly optical cable. Based on embodiment 1, it provides the function of facilitating wiring and reducing the probability of bending by focusing on the bending resistance of the butterfly optical cable itself.

[0037] See Figure 1 and Figure 2 There are four steel wires 2, and the projections of the four steel wires 2 on the cross section of the sheath 1 form an isosceles trapezoid. The geometric center of the isosceles trapezoid is located on the central axis of the fiber core 3. By using the four steel wires 2 distributed in a trapezoidal shape, the distance between the steel wires 2 and the outer periphery of the sheath 1 is reduced. Thus, when the sheath 1 is bent, the steel wires 2 located on the outside of the bending position can withstand more tensile stress, thereby suppressing the overall bending deformation of the sheath 1.

[0038] See Figure 3 and Figure 4 A support portion 403 is provided on the side of the sliding portion 402 near the adjacent fixing portion 401. The support portion 403 is used to contact the flexible sleeve 5 to limit the maximum deformation of the anchor frame 4.

[0039] The above configuration can limit the maximum deformation of the anchor skeleton 4 by the support part 403 during the thermal expansion of the sheath 1, and prevent the anchor skeleton 4 from being squeezed by the sheath 1 and undergoing plastic deformation.

[0040] In addition, during the initial bending process of the sheath 1, the outer side of the bending position of the sheath 1 is subjected to tensile stress, and the inner side of the bending position is subjected to compressive stress. The shape of the anchor frame 4 changes according to the stress on each part of the sheath 1 (that is, the shape of the anchor frame 4 on the outer side of the bending position is restored, and the anchor frame 4 on the inner side of the bending position is compressed). The deformation of the anchor frame 4 reduces the bending strength of the sheath 1 and enhances the flexibility of the sheath 1, which facilitates the perforation and wiring operations when installing the butterfly optical cable.

[0041] When the support part 403 on the inner side of the bending position of the sheath 1 comes into contact with the flexible sleeve 5 near the fixing part 401, the anchor frame 4 can no longer be compressed. If the sheath 1 continues to bend, it is necessary to overcome the structural rigidity of the sheath 1 itself and use the structural rigidity of the sheath 1 to buffer the force that drives it to bend, thereby reducing the probability that the sheath 1 bends too much and damages the fiber core 3.

[0042] See Figure 2Several spiral components 6 are provided on two steel wires 2 that are distributed diagonally. The spiral components 6 are located between two adjacent anchor frames 4 on the same steel wire 2. Both ends of the spiral components 6 are fixed to the adjacent steel wires 2. The spiral components 6 are made of non-metallic material, which makes the butterfly optical cable lighter.

[0043] When the sheath 1 bends, the sheath 1 causes the steel wire 2 and the spiral 6 to bend together. The pitch of the spiral 6 on the inner side of the bending position decreases, while the pitch of the spiral 6 on the outer side of the bending position increases. When the anchor frame 4 can no longer deform, as the sheath 1 continues to bend until the sheath 1 bends to near its limit, the pitch of the spiral 6 on the inner side of the bending position decreases to zero. At this time, the inner parts of the spiral 6 on the bending position support each other. Since the steel wire 2 limits the two ends of the spiral 6, the steel wire 2 and the spiral 6 cannot bend further, providing rigid "support" for the sheath 1 and preventing the fiber core 3 from being damaged by excessive bending.

[0044] By relying on the anchor frame 4 and the spiral component 6, the bending strength of the butterfly optical cable is divided into three stages according to the bending amplitude. During normal use and installation, the elastic deformation of the anchor frame 4 reduces the bending strength of the butterfly optical cable, improves its flexibility, and facilitates perforation and wiring operations. When part of the butterfly optical cable is suspended, the structural rigidity of the sheath 1 suppresses the bending of the butterfly optical cable, keeping the fiber core 3 within the minimum bending radius. When the suspended part of the butterfly optical cable is swayed by wind, causing the bending amplitude to increase, the structural rigidity of the sheath 1 buffers the bending behavior of the butterfly optical cable, and the spiral component 6 serves as the final guarantee, reducing the probability of excessive bending of the suspended butterfly optical cable.

[0045] Example 3

[0046] This embodiment provides an corrosion-resistant butterfly optical cable that, based on embodiment 2, provides the function of maintaining the structural stability of the sheath 1.

[0047] See Figures 1 to 3 The anchor skeletons 4 on any two non-diagonal steel wires 2 are staggered; by optimizing the distribution of the anchor skeletons 4 in the sheath 1, the minimum cross-sectional area of ​​the sheath 1 is limited, thereby reducing the probability of the sheath 1 being damaged due to bending while maintaining the basic structural strength stability of the sheath 1.

[0048] Example 4

[0049] This embodiment provides a corrosion-resistant butterfly optical cable, which enhances the stability of the butterfly optical cable in a suspended state based on Embodiment 3.

[0050] See Figure 2 and Figure 3The sliding portions 402 on any two non-diagonal steel wires 2 are oriented in opposite directions relative to the adjacent fixed portions 401.

[0051] The above settings are designed to address the issue of the sheath 1 being suspended in the middle. By relying on the characteristic that the anchor frame 4 is fixed to the steel wire 2 on only one side, both sides of the suspended position of the sheath 1 can rely on the steel wire 2 and the anchor frame 4 to provide stable traction for the suspended middle of the sheath 1, thereby enhancing the stability of the connection between the sheath 1 and the steel wire 2.

[0052] Example 5

[0053] This embodiment provides a corrosion-resistant butterfly optical cable, based on embodiment 4, to address the issue that the suspended section of the butterfly optical cable is susceptible to wear.

[0054] See Figure 1 The spacing between any two steel wires 2 is greater than the diameter of the fiber core 3; the fiber core 3 is protected by four steel wires 2 arranged in a trapezoidal pattern to cope with the frequent friction of the butterfly optical cable and reduce the probability of the fiber core 3 being damaged due to friction.

[0055] Example 6

[0056] This embodiment provides a corrosion-resistant butterfly-shaped optical cable, which, based on embodiment 5, provides the function of reducing the degree of deformation of the fiber core 3.

[0057] See Figure 1 , Figure 2 and Figure 5 The sheath 1 has multiple sets of buffer cavities 301 arranged at equal intervals in the middle. Each set of buffer cavities 301 includes two symmetrically distributed buffer cavities. The projection of the buffer cavities 301 on the cross section of the sheath 1 is a semi-circular arc, and the buffer cavities 301 are coaxial with the fiber core 3. When the sheath 1 bends, the buffer cavities 301 provide space for the fiber core 3, reducing the bending amplitude of the fiber core 3. When the sheath 1 is compressed, the buffer cavities 301 provide a margin for the deformation of the sheath 1, reducing the probability of the fiber core 3 being compressed and deformed.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A corrosion-resistant butterfly-shaped optical cable, characterized in that, include: A sheath (1) is provided with multiple steel wires (2) embedded inside the sheath (1). A fiber core (3) is embedded in the middle of the sheath (1). Multiple anchor skeletons (4) are provided on the steel wires (2) at equal intervals. The anchor skeletons (4) are provided with a fixing part (401) and a sliding part (402). The fixing part (401) is fixed to the adjacent steel wires (2). The anchor skeletons (4) are embedded in the sheath (1). The anchor skeletons (4) are used to enhance the bonding strength between the steel wires (2) and the sheath (1). The anchoring frame (4) is fixed with a flexible sleeve (5). The anchoring frame (4) is made of elastic metal. The structural stiffness of the anchoring frame (4) is less than that of the sheath (1). The anchoring frame (4) is used to provide a margin for the volume change of the sheath (1). The sliding part (402) is provided with a support part (403) on the side near the adjacent fixing part (401). The support part (403) is used to contact the flexible sleeve (5) to limit the maximum deformation of the anchoring frame (4).

2. The corrosion-resistant butterfly optical cable according to claim 1, characterized in that, The number of steel wires (2) is four, and the projections of the four steel wires (2) on the cross section of the sheath (1) form an isosceles trapezoid, the geometric center of which is located on the central axis of the fiber core (3).

3. The corrosion-resistant butterfly optical cable according to claim 1, characterized in that, Several spiral components (6) are provided on two steel wires (2) distributed diagonally. The spiral components (6) are located between two adjacent anchoring frames (4) on the same steel wire (2). Both ends of the spiral components (6) are fixed to the adjacent steel wires (2).

4. A corrosion-resistant butterfly optical cable according to claim 3, characterized in that, Both the spiral component (6) and the flexible sleeve (5) are made of non-metallic materials.

5. A corrosion-resistant butterfly optical cable according to claim 3, characterized in that, The anchoring frames (4) on any two non-diagonal steel wires (2) are staggered.

6. A corrosion-resistant butterfly optical cable according to claim 3, characterized in that, The sliding portions (402) on any two non-diagonal steel wires (2) are oriented opposite to the adjacent fixed portions (401).

7. A corrosion-resistant butterfly optical cable according to claim 3, characterized in that, The distance between any two of the steel wires (2) is greater than the diameter of the fiber core (3).

8. A corrosion-resistant butterfly optical cable according to claim 3, characterized in that, The sheath (1) has multiple sets of buffer cavities (301) arranged at equal intervals near the fiber core (3), and each set of buffer cavities (301) includes two symmetrically distributed ones.

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