Bird pecking prevention 8-shaped optical cable and preparation method thereof

Abstract

The invention discloses a bird pecking prevention 8-shaped optical cable and a preparation method thereof, and belongs to the technical field of optical cables, the bird pecking prevention 8-shaped optical cable comprises an optical cable part and a suspension wire, the optical cable part is connected with the suspension wire through a connecting part, an easy-pecking part is formed at the joint of the optical cable part and the connecting part, the outer contour of the easy-pecking part is an elliptic curve, and the elliptic curve meets a specific equation. Therefore, the impact force on the optical cable during bird pecking is reduced. According to the 8-shaped optical cable for preventing bird pecking, the surface of the joint of the optical cable part and the connecting part is designed, and the outer protection structure of the 8-shaped optical cable is adjusted, so that a specific curve is formed in the area, easy to be pecked by birds, of the optical cable part in the 8-shaped optical cable, and when the optical cable sheath is pecked by the birds, the elliptic curve can decompose bird pecking force; therefore, the component force of the 8-shaped optical cable to the center of the optical cable part is smaller than that of a conventional 8-shaped optical cable, the probability of optical cable damage is reduced, and the bird pecking protection capability of the 8-shaped optical cable is enhanced without increasing the production cost of the optical cable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical cables, and particularly relates to an 8-shaped optical cable for preventing bird pecking and a preparation method thereof. BACKGROUND

[0002] The 8-shaped optical cable is an overhead laying optical cable with a special structure, and the cross section of the 8-shaped optical cable as a whole is in the shape of an "8". The 8-shaped optical cable is integrally formed by an optical cable unit containing an optical fiber and a hoisting wire for hoisting, and the overhead laying is completed through the hoisting wire structure. The 8-shaped optical cable has the advantages of quick construction, high tensile strength, and low overhead laying cost.

[0003] The 8-shaped optical cable is different from a duct optical cable. The duct optical cable is usually buried underground and has a duct protection, and the external environmental factors have less influence on the optical cable. Due to the overhead characteristic, the 8-shaped optical cable is in an exposed state, and the overhead optical cable is easily pecked by birds, causing damage to the optical cable. When the optical cable is damaged, it is difficult to repair due to being erected in the air, and usually the whole line cable needs to be replaced, and the 8-shaped optical cable cannot be repaired like a conventional optical cable, causing the problem of high repair cost of the 8-shaped optical cable.

[0004] Based on the problem that the 8-shaped optical cable is easily damaged by bird pecking, the existing method mainly enhances the 8-shaped optical cable externally, and a metal armor layer is added inside the 8-shaped optical cable to prevent bird pecking. However, the metal armor structure significantly increases the cost of the optical cable, and increases the weight of the optical cable, causing the risk of metal fatigue fracture of the optical cable in the hoisting process, and increasing the probability of damage to the optical cable. SUMMARY

[0005] In view of one or more of the above defects or improvement needs of the prior art, the present application provides an 8-shaped optical cable for preventing bird pecking to solve the problem that the existing 8-shaped optical cable for preventing bird pecking has high cost and is prone to the risk of metal fatigue fracture due to the metal armor structure.

[0006] To achieve the above-mentioned purpose, the present application provides an 8-shaped optical cable for preventing bird pecking, which comprises: an optical cable part and a hoisting wire, the optical cable part being connected with the hoisting wire through a connecting part; an easily pecked part is formed at the joint of the optical cable part and the connecting part, the outer contour of the easily pecked part is an elliptic curve, and the equation of the elliptic curve is: y(x) = (H - r) · [1 - |x / R|n]^(1 / n) (Formula 1) wherein y is the position of the outer contour of the easily pecked part on the Y coordinate axis with the center of the optical cable part as the coordinate origin; x is the position of the outer contour of the easily pecked part on the X coordinate axis with the center of the optical cable part as the origin; H is the position of the connecting part of the hoisting wire and the optical cable part on the Y coordinate axis, R is the outer contour radius of the optical cable part, r is an empirical coefficient, and n is a fitting constant of H, R and r. wherein, r=0.6R~0.8R (Formula 2) n=ln2 / ln[R / √(r²-(H-r)²)] (Formula 3) and the outer contour curve of the easy-pecking part is tangent to the outer surface of the optical cable part when x is ±R.

[0007] As a further improvement of the present application, the easy-pecking part is made of nylon 12 or nylon 16, and the easy-pecking part is co-extruded with the outer sheath of the optical cable part.

[0008] As a further improvement of the present application, the surface roughness of the easy-pecking part is less than 0.4 μm.

[0009] As a further improvement of the present application, the outer sheath of the optical cable part is formed by mixed extrusion of high-density polyethylene and low linear density polyethylene.

[0010] As a further improvement of the present application, the easy-pecking part is further embedded with a reinforcing steel wire in the outer sheath of the optical cable part.

[0011] As a further improvement of the present application, the hanging wire is further provided with a protrusion away from the side of the optical cable part.

[0012] The present application also includes a preparation method of the bird-pecking-preventing 8-shaped optical cable, which comprises the following steps: Traction of the optical unit, and twisting of the optical unit and the reinforcing member to obtain a twisted structure of the optical unit and the reinforcing member; Traction of the load-bearing steel wire, the twisted structure of the optical unit and the reinforcing member through an extrusion die of a set shape, extrusion of the outer sheath to obtain the bird-pecking-preventing 8-shaped optical cable.

[0013] As a further improvement of the present application, the sheath material of the outer sheath of the optical cable part comprises high-density polyethylene, low linear density polyethylene, a compatibilizer, an ultraviolet-resistant additive and an antioxidant.

[0014] As a further improvement of the present application, the sheath material of the outer sheath of the optical cable part comprises, by mass fraction, 60%~70% of high-density polyethylene, 10~20% of low linear density polyethylene, 5%~8% of a compatibilizer, 2%~2.5% of an ultraviolet-resistant additive, 1%~2% of a nucleating agent and 0.1%~0.5% of an antioxidant.

[0015] As a further improvement of the present application, the base die comprises a main flow channel and a secondary flow channel, the main flow channel is used for conveying the sheath material of the optical cable part, the secondary flow channel is used for conveying the sheath material of the easy-pecking part, and the main flow channel and the secondary flow channel are connected at a tooth-shaped interface.

[0016] As a further improvement of the present application, the outer sheath is formed by a vacuum sizing process.

[0017] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: (1) The figure-eight optical cable of the present invention is designed to prevent birds from pecking. By designing the surface at the junction of the optical cable and the connecting part, and by adjusting the outer sheath structure of the figure-eight optical cable, a specific curve is formed in the area of ​​the optical cable that is easily pecked by birds. When birds peck the optical cable sheath, the elliptical curve will decompose the pecking force, so that the component force on the center of the optical cable is less than that of conventional figure-eight optical cables, thereby reducing the probability of optical cable breakage. It enhances the protection capability of the figure-eight optical cable against bird pecking without increasing the production cost of the optical cable.

[0019] (2) The figure-eight optical cable for bird-proofing of the present invention uses nylon 12 or nylon 16 to replace the easy-to-peck part, which can increase the strength of the outer sheath in the bird-peck area and further reduce the possibility of damage to the figure-eight optical cable; at the same time, the easy-to-peck part adopts the co-extrusion process with the outer sheath of the optical cable to make the two become one, avoiding the problem of the easy-to-peck part separating from the outer sheath of the figure-eight optical cable.

[0020] (3) The outer sheath of the optical cable for bird-proof figure-eight cable of the present invention is made of high-density polyethylene and low linear density polyethylene by co-extrusion molding. The co-extrusion molding of high-density polyethylene and low linear density polyethylene can improve the melt viscosity and interfacial adhesion of the blended material, thereby reducing the overall fluidity of the outer sheath, so that the outer sheath of the figure-eight cable has a better shape retention ability, so as to form an easy-to-peck part with a specific curvature. By ensuring that the curvature of the easy-to-peck part is formed according to the curve of the elliptic curve equation, the bird-proof ability of the figure-eight optical cable is improved. Attached Figure Description

[0021] Fig. 1 This is a schematic diagram of an existing figure-eight fiber optic cable being pecked by birds; Fig. 2 This is a cross-sectional schematic diagram of the figure-eight optical cable used for bird-proofing in an embodiment of the present invention; Fig. 3 This is a schematic diagram illustrating the stress analysis of the optical cable section in an existing figure-eight optical cable under bird pecking.

[0022] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Optical cable section; 2. Suspension wire; 3. Connector section; 4. Easy-to-pick section; 5. Optical unit; 6. Reinforcing member; 7. Reinforcing steel wire. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of this invention, it should be understood that, unless otherwise stated, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] Furthermore, unless otherwise stated, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Example: Please see Figs. 1-3 In a preferred embodiment of the present invention, the figure-eight optical cable for bird pecking prevention includes an optical cable section 1 and a suspension wire 2, wherein the optical cable section 1 and the suspension wire 2 are connected by a connecting section 3; wherein, an easy-to-peck portion 4 is formed at the junction of the optical cable section 1 and the connecting section 3, the outer contour of the easy-to-peck portion 4 being an elliptical curve, and the equation of the elliptical curve is: y(x)=(H-r)·[1-|x / R|^n]^(1 / n) (Formula 1) Where y is the position of the outer contour section of the easy-to-peck part 4 on the Y-axis with the center of the optical cable part 1 as the origin; x is the position of the outer contour section of the easy-to-peck part 4 on the X-axis with the center of the optical cable part 1 as the origin; H is the position of the connection between the suspension wire 2 and the optical cable part 1 on the Y-axis; R is the outer contour radius of the optical cable part 1; r is an empirical coefficient; and n is the fitting constant of H, R and r. Where r = 0.6R ~ 0.8R (Formula 2) n = ln2 / ln[R / √(r²-(H-r)²)] (Formula 3) The outer contour curve of the aforementioned easy-to-peck part 4 is tangent to the outer surface of the optical cable part 1 when x is ±R.

[0029] The bird-peck-resistant figure-eight optical cable of this invention designs the surface at the junction of the optical cable section 1 and the connecting section 3. By adjusting the outer sheath structure of the figure-eight optical cable, a specific curve is formed in the area of ​​the optical cable section 1 that is easily pecked by birds. When birds peck at the cable sheath, this elliptical curve decomposes the pecking force, making the component force on the center of the optical cable section 1 less than that of a conventional figure-eight optical cable, thus reducing the probability of cable breakage. This enhances the bird-peck protection capability of the figure-eight optical cable without increasing the production cost. It is worth noting that in the optical cable design process, the radius R of the optical cable section 1 of the figure-eight optical cable is an accurate value, H is an increase of 1~2mm from the radius of the optical cable section 1, which can be understood as the height of the vertex of the elliptical curve, and r is an empirical coefficient related to the ellipticity of the elliptical curve. All the above values ​​are constants.

[0030] Specifically, such as Fig. 1 As shown, the red area represents the vulnerable area for bird pecking in a conventional figure-eight fiber optic cable. The stress analysis of a conventional figure-eight fiber optic cable under bird pecking conditions is as follows: Fig. 3 As shown, point A is the point of impact from the bird peck, O is the center of the cross-section of the optical cable section 1, F is the instantaneous force of the bird peck, F2 and F1 are the components of F in the cross-section of the optical cable and towards the center of the optical cable, respectively, and θ is the angle formed by the line connecting the instantaneous force F and OA. When the figure-eight optical cable is pecked by a bird, the component force towards the center of the optical cable has the impact force on the internal optical fibers. The following compares the forces on a conventional figure-eight optical cable and the figure-eight optical cable used for bird peck prevention in this application: For any force F, when force F is applied to the surface of the outer sheath of the optical cable, the component of force F that affects the interior of the optical cable is F1. The outer surface of the optical cable sheath can be considered as a vector F = (Fx, Fy) in a Cartesian coordinate system. The vertex of vector F lies on the surface of the curve y(x1) = (H - r)·[1 - |x / R|^n]^(1 / n). The absolute value of the normal vector to the curve y(x1), |F1|, is the magnitude of the component force F1. Based on Equation 1, the following can be derived: |F1|=|-F X f′(x) + Fy| / √1+[ f′(x)] 2 (Formula 4) Where f(x) = y(x1) = (H - r)·[1 - |x / R|^n]^(1 / n) (Formula 5) Substituting Equation 5 into Equation 4 and taking the derivative of Equation 4, we get: |F1|=|F X *(Hr) / R*(x / R) n-1 *[1-(x / R) n ] (1 / n)-1 +Fy| / (√(1+ [y1′(x)] 2 )) (Formula 6) Similarly, in a Cartesian coordinate system, the outer sheath surface curve of a conventional figure-eight optical cable is as follows: y(x) = √(R) 2 - x²) (Formula 7) The force component of a standard figure-eight optical cable on the cable center is: |F 1’ |=|F X *x+ Fy√(R) 2 -x 2 )| / √R (Formula 8) By comparing |F1| and |F in formulas 6 and 8 1’ |, it can be seen that there is always |F 1’ |>|F1|, meaning that when x takes the value [-R, R], the component force of the bird-pecking anti-figure-eight optical cable in this invention directed towards the center of the optical cable section 1 is always less than the component force of a conventional figure-eight optical cable directed towards the center of the optical cable section 1 when pecked by a bird. The bird-pecking anti-figure-eight optical cable in this invention, by adjusting the overall shape of the optical cable, minimizes the impact on the internal optical fibers when pecked by birds, thus reducing the probability of cable breakage.

[0031] Furthermore, as an optional embodiment of the present invention, the easy-pecking part 4 is made of nylon 12 or nylon 16, and the easy-pecking part 4 is co-extruded with the outer sheath of the optical cable part 1. Replacing the easy-pecking part 4 with nylon 12 or nylon 16 can increase the strength of the outer sheath in the bird-pecking area, further reducing the possibility of damage to the figure-eight optical cable. The easy-pecking part 4 is co-extruded with the outer sheath of the optical cable part 1, making the two integral and avoiding the problem of the easy-pecking part 4 detaching from the outer sheath of the figure-eight optical cable.

[0032] Furthermore, as an optional embodiment of the present invention, the surface roughness of the easy-to-peck portion 4 is less than 0.4 μm. The smoother the surface of the easy-to-peck portion 4, the less force is applied when a bird pecks, further reducing the probability of the figure-eight optical cable sheath being pecked.

[0033] Furthermore, as an optional embodiment of the present invention, the outer sheath of the optical cable portion 1 is formed by co-extrusion molding of high-density polyethylene and low-linear-density polyethylene. The co-extrusion molding of high-density polyethylene and low-linear-density polyethylene can increase the melt viscosity and interfacial adhesion of the blended material, thereby reducing the overall fluidity of the outer sheath. This results in better shape retention of the figure-eight optical cable outer sheath, allowing for the formation of a pecking-prone portion 4 with a specific curvature. By ensuring that the curvature of the pecking-prone portion 4 is formed according to the elliptic curve equation, the bird-pecking resistance of the figure-eight optical cable is improved.

[0034] Furthermore, as an optional embodiment of the present invention, a reinforcing steel wire 7 is also embedded in the outer sheath of the easy-to-peck portion 4 and / or the optical cable portion 1. The reinforcing steel wire 7 is made of a different material than the easy-to-peck portion 4 and the outer sheath. When the reinforcing steel wire 7 is embedded, it can impede the flow of the easy-to-peck portion 4 and the outer sheath, thereby improving the shape retention capability of the bird-peck-proof figure-eight optical cable and making the forming arc of the easy-to-peck portion 4 form a curve according to the equation of the ellipse.

[0035] Furthermore, as an optional embodiment of the present invention, the suspension wire 2 is provided with a protrusion on the side opposite to the optical cable portion 1. When a bird pecks at the figure-eight optical cable, the bird grasps onto the suspension wire 2 and then pecks at the optical cable portion 1. When a protrusion is provided on the side of the suspension wire 2 opposite to the optical cable portion 1, the protrusion can stimulate the bird's feet, thereby reducing the stability of its grip, reducing the pecking force of the bird, and the probability of the bird landing. Optionally, the protrusion structure can also be arranged at any angle around the circumference of the suspension wire 2 to reduce the pecking force of the bird and the probability of the bird landing.

[0036] The core of this invention lies in molding an outer sheath of a predetermined shape. Due to the strict requirements on the shape and curvature of the outer sheath, the ability to maintain its form during the molding process and its ability to maintain its shape during long-term use are crucial. Based on this, this invention adjusts the material composition and preparation process for bird-proof figure-eight optical cables.

[0037] Furthermore, the present invention also includes a method for preparing a bird-proof figure-eight optical cable, which includes the following steps: The optical unit 5 is pulled and twisted with the reinforcing member 6 to obtain the twisted structure of the optical unit 5 and the reinforcing member 6; The traction bearing steel wire, optical unit 5 and reinforcing member 6 are twisted together and passed through an extrusion die of a set shape to extrude and form an outer sheath, thus obtaining a figure-eight optical cable for bird pecking prevention.

[0038] Furthermore, in this invention, the outer sheath is made by extrusion molding of a mixture of high-density polyethylene and low linear density polyethylene; the easy-to-peel part 4 is made of nylon 12 or nylon 16.

[0039] Furthermore, the outer sheath material comprises high-density polyethylene (HDPE), low-linear-density polyethylene (LDPE), compatibilizer, UV stabilizer, and antioxidant. In the combined structure of HDPE and LDPE, HDPE provides rigidity to the sheath, while LDPE provides toughness, allowing the sheath material to possess both extrusion flowability and overall molding capability during extrusion molding. The compatibilizer primarily provides interfacial adhesion, ensuring good bonding between polyethylene and nylon 12 or nylon 16, thus guaranteeing the overall integrity of the outer sheath. The UV stabilizer enhances the overall weather resistance of the outer sheath, while the antioxidant slows down the degradation of the outer sheath in the external environment. Both ensure the shape retention of the bird-peck-proof figure-eight optical cable during long-term use, preventing a decrease in bird-peck-proof capability due to deformation.

[0040] Furthermore, as an optional embodiment of the present invention, the sheath material also includes a nucleating agent, which can reduce the overall shrinkage rate of the outer sheath to ensure that the easy-to-peel part 4 is formed into the set curvature.

[0041] Furthermore, as a specific embodiment of the present invention, the outer sheath material of the optical cable section 1 comprises, by composition, high-density polyethylene, low linear density polyethylene, maleic anhydride-grafted polyethylene, carbon black, UV-531, talc, calcium stearate, and antioxidant 300. Among these components, maleic anhydride-grafted polyethylene serves as a compatibilizer, UV-531 and carbon black are UV-resistant additives, talc and calcium stearate are nucleating agents, and antioxidant 300 is an antioxidant.

[0042] Further optionally, the sheath material of the outer sheath of the optical cable section 1 in this invention comprises, by weight: 60%~70% high-density polyethylene, 10~20% low linear density polyethylene, 5%~8% compatibilizer, 2%~2.5% UV stabilizer, 1%~2% nucleating agent, and 0.1%~0.5% antioxidant.

[0043] Furthermore, as an optional embodiment of the present invention, a stainless steel wire is also embedded in the easy-to-peel part 4, the stainless steel wire being arranged along the optical cable axis, and the diameter of the stainless steel wire being 0.2~0.3mm. Optionally, an FRP reinforcing member is embedded in the outer sheath of the optical cable part 1, the FRP reinforcing member being arranged along the optical cable axis, and the diameter of the FRP reinforcing member being 1~2mm.

[0044] Furthermore, as an optional embodiment of the present invention, the extrusion die is used to form the outer sheath, which includes a main channel and a secondary channel. The main channel is used to transport the sheath material of the optical cable part 1, and the secondary channel is used to transport the sheath material of the easy-to-peck part 4. The outlet where the main channel and the secondary channel meet is a toothed interface, thereby forming a structure in which the optical cable part 1 and the easy-to-peck part 4 mesh with each other, increasing the adhesive bonding force between the optical cable part 1 and the easy-to-peck part 4.

[0045] Furthermore, as an optional embodiment of the present invention, the sheath material of the optical cable section 1 is extruded using a single-screw extruder, with the temperature of the first barrel zone being 160~170℃, the temperature of the second barrel zone being 180~190℃, the temperature of the third barrel zone being 200~210℃, the extruder die temperature being 210~220℃, the extruder screw speed being 20~30 rpm, and the melt pressure being 18~22 MPa; the sheath material of the easy-to-peel section 4 is extruded using a twin-screw extruder, with the temperature of the first barrel zone being 220~230℃, the temperature of the second barrel zone being 235~245℃, the temperature of the third barrel zone being 245~255℃, the extruder die temperature being 240~250℃, the screw speed being 30~40 rpm, and the melt pressure being 22~25 MPa.

[0046] Furthermore, as an optional embodiment of the present invention, the outer sheath of the present invention is formed by vacuum sizing process, which can further ensure that the figure-eight optical cable for bird pecking prevention is formed according to the set shape.

[0047] The following tests were conducted in areas with frequent bird activity: a conventional figure-eight optical cable, a common figure-eight optical cable with the same shape as the bird-pecking figure-eight optical cable of this invention, and a figure-eight optical cable with a peck-prone section 4 made of nylon 12 or 16. After 3 months, the damage to the cable sheath was observed. All samples were 3km long. The probability of cable damage was calculated as the length of the damaged area divided by the total length of the cable. The probability of damage to the red area was calculated as the number of times the red area was damaged divided by the total number of damages. The specific damage details are shown in the table below.

[0048] The above comparison shows that the bird-peck-resistant figure-eight optical cable designed in this invention can significantly reduce the probability of cable damage, and the probability of damage to the vulnerable part 4 is also significantly reduced. Furthermore, the manufacturing cost of the bird-peck-resistant figure-eight optical cable of this invention is similar to that of a conventional figure-eight optical cable, thus improving the bird-peck-resistant capability of the figure-eight optical cable without significantly increasing the manufacturing cost.

[0049] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A figure-eight optical cable for bird-proofing, characterized in that, include: The optical cable section and the suspension wire are connected by a connecting part; The junction between the optical cable section and the connecting section forms a peckable section, the outer contour of which is an elliptical curve, and the equation of the elliptical curve is: y(x)=(H-r)·[1-|x / R|^n]^(1 / n) (Formula 1) Where y is the position of the easy-to-peel section's outer contour cross-section on the Y-axis with the center of the optical cable section as the origin; x is the position of the easy-to-peel section's outer contour cross-section on the X-axis with the center of the optical cable section as the origin; H is the position of the connection between the suspension wire and the optical cable section on the Y-axis; R is the outer contour radius of the optical cable section; r is an empirical coefficient; and n is the fitting constant of H, R, and r. Where r = 0.6R ~ 0.8R (Formula 2) n = ln2 / ln[R / √(r²-(H-r)²)] (Formula 3) The outer contour curve of the easy-to-peck part is tangent to the outer surface of the optical cable part when x is ±R.

2. The figure-eight optical cable for bird-proofing according to claim 1, characterized in that, The easy-to-peel part is made of nylon 12 or nylon 16, and the easy-to-peel part is co-extruded with the outer sheath of the optical cable part.

3. The figure-eight optical cable for bird-proofing according to claim 2, characterized in that, The surface roughness of the easy-to-peck part is less than 0.4 μm.

4. The figure-eight optical cable for bird-proofing according to claim 1, characterized in that, The outer sheath of the optical cable is made of a mixture of high-density polyethylene and low linear density polyethylene through extrusion molding.

5. The figure-eight optical cable for bird-proofing according to claim 1, characterized in that, The outer sheath of the easy-to-peel section and the optical cable section is also embedded with reinforcing steel wires.

6. The figure-eight optical cable for bird-proofing according to claim 1, characterized in that, The suspension wire also has a protrusion on the side opposite to the optical cable section.

7. A method for preparing a bird-pecking figure-eight optical cable, used to prepare a bird-pecking figure-eight optical cable as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The optical unit is pulled and twisted with the reinforcing member to obtain a twisted structure of optical unit and reinforcing member; The traction-bearing steel wire, optical unit and reinforcing member twisted structure pass through the extrusion die of a set shape, and the outer sheath is extruded to obtain the figure-eight optical cable for bird pecking prevention.

8. The method for preparing a bird-proof figure-eight optical cable according to claim 7, characterized in that, The outer sheath material of the optical cable includes, by composition, high-density polyethylene, low linear density polyethylene, compatibilizer, UV stabilizer and antioxidant.

9. The method for preparing a bird-proof figure-eight optical cable according to claim 8, characterized in that, The sheath material of the outer sheath of the optical cable comprises, by weight, the following components: 60%~70% high-density polyethylene, 10~20% low linear density polyethylene, 5%~8% compatibilizer, 2%~2.5% UV stabilizer, 1%~2% nucleating agent, and 0.1%~0.5% antioxidant.

10. The method for preparing a bird-proof figure-eight optical cable according to claim 8, characterized in that, The outer sheath is formed using a vacuum sizing process.

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