High-performance polyethylene graphene air-blowing unit EPFU optical cable and preparation method thereof

Abstract

The invention discloses a high-performance polyethylene graphene air-blowing unit EPFU optical cable and a preparation method, and relates to the technical field of optical cables. A high-performance polyethylene graphene air-blowing unit EPFU optical cable comprises a plurality of stress sleeves which are transversely arranged on the periphery of the optical cable, and the stress sleeves are used for shielding gas when the gas is pumped into an underground pipeline; the outer diameter of the stress sleeve is smaller than the inner diameter of the underground pipeline; the rubber ring is arranged on the periphery of the optical cable close to the front end of the stress sleeve, an annular groove is formed between the rubber ring and the stress sleeve, and an air cushion is formed in the annular groove; the stress sleeves are distributed at equal intervals in the axial direction of the optical cable, gas kinetic energy is converted into axial thrust through the conical structure, the gas-blowing thrust is dispersed to the full length of the optical cable from the front end piston piece, and the risk that the optical cable is broken due to single-point stress is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical cables, and more specifically, relates to a high-performance polyethylene graphene blown unit EPFU optical cable and a preparation method thereof. Background Art

[0002] After the wire cores of the EPFU optical cable are cured in a photosensitive resin in a certain arrangement, a special low-friction sheath is extruded. Some products use high-performance polyethylene materials as the main component of the sheath and add additives such as graphene to improve performance. Graphene has excellent mechanical properties, thermal conductivity, electrical conductivity, etc. Adding it to polyethylene can improve the strength, wear resistance, anti-aging property of the sheath and reduce the friction coefficient, making the optical cable more suitable for the blown laying method; Blown optical cable is a technology that uses compressed gas (usually air) to push the optical cable or cable through the inside of a pipeline. This technology is mainly used for optical fiber wiring or cable wiring, especially in places where manual laying is difficult, such as long-distance underground pipelines. Blown optical cable has the advantages of high-efficiency cable laying, reduced damage, long-distance cable laying, reduced labor intensity, strong scalability, etc., so it is widely used in the telecommunications industry and other fields that require long-distance cable laying.

[0003] When laying a blown optical cable, a piston part is installed at the front end of the optical cable. The outer circumference of the piston part is in contact with the inner wall of the underground pipeline. By pumping gas into the underground pipeline through a high-pressure gas charging device, the piston part is pushed to move, thereby realizing pulling the optical cable for blown laying. This laying method has relatively high requirements for the strength of the optical cable. Since the piston part is only arranged at the front end of the optical cable, the stress point will be located at the front end of the optical cable, resulting in problems such as the optical cable being pulled off or the internal wire cores being damaged due to concentrated stress points during the laying process, and the optical cable being dragged on the underground pipeline, causing wear on the surface of the optical cable and increasing the friction force, which affects the laying efficiency of the blown optical cable. Therefore, a high-performance polyethylene graphene blown unit EPFU optical cable is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-performance polyethylene graphene blown unit EPFU optical cable that can overcome or at least partially solve the above problems.

[0005] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: a high-performance polyethylene graphene blown unit EPFU optical cable, including: a plurality of force-bearing sleeves arranged horizontally on the outer circumference of the optical cable, the force-bearing sleeves being used to block the gas when the gas is pumped into the underground pipeline; the outer diameter of the force-bearing sleeves is smaller than the inner diameter of the underground pipeline; a rubber ring is arranged on the outer circumference of the optical cable near the front end of the force-bearing sleeve, and an annular groove is formed between the rubber ring and the force-bearing sleeve, and an air cushion is formed in the annular groove.

[0006] Preferably, the optical cable includes an inner sleeve enclosing a core, the inner sleeve is filled with resin, an outer sleeve is sleeved on the inner sleeve, and a filler is filled between the inner sleeve and the outer sleeve.

[0007] Preferably, the optical cable includes an inner sleeve sleeved with a hollow tube, the core is arranged between the inner sleeve and the hollow tube, resin is filled between the inner sleeve and the hollow tube, a polyethylene fiber bundle is arranged in the hollow tube, an outer sleeve is sleeved on the inner sleeve, and a filler is filled between the inner sleeve and the outer sleeve.

[0008] Preferably, the stress sleeve is conical, horizontal holes are circumferentially formed in the front end face of the stress sleeve near the outer periphery of the outer sleeve, and the horizontal holes are communicated with the annular groove.

[0009] Further, a plurality of wave guide grooves are circumferentially formed in the outer periphery of the outer sleeve, one end of the wave guide groove leads to the annular groove, a release ring groove is formed in the outer sleeve at the other end of the wave guide groove, and the release ring groove is communicated with the other end of the wave guide groove.

[0010] Further, a spiral groove is circumferentially formed in the outer periphery of the outer sleeve.

[0011] Further, a plurality of groups of metal strip pieces are symmetrically and fixedly connected between the outer periphery of the inner sleeve and the inner wall of the outer sleeve, and cavities are formed between each group of metal strip pieces.

[0012] Further, vertical holes are circumferentially formed in the outer sleeve located in the annular groove, the vertical holes are communicated with the cavities, and inclined holes are circumferentially formed in the outer sleeve located in the stress sleeve, and one end of the inclined holes faces the inner wall of the stress sleeve.

[0013] Further, the stress sleeve is rotatably connected to the outer sleeve, and a plurality of flow guiding pieces are circumferentially and fixedly connected to the inner wall of the stress sleeve.

[0014] A preparation method for a high-performance polyethylene graphene blown unit EPFU optical cable includes the following steps: S1. Prepare the outer sleeve: ultra-high molecular weight polyethylene 90%-95%, graphene microflakes 5%-10%, antioxidant 0.5%-1%; S2. Prepare the inner sleeve: polybutylene terephthalate: 90%-95%, glass fiber: 20%-30%, silicone masterbatch: 1%-2%, ultraviolet absorber: 0.5%-1%; S3. Prepare the hollow tube: modified PBT material; S4. Prepare the metal strip pieces: stainless steel or aluminum alloy material, surface nickel plating treatment.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. For the high-performance polyethylene graphene air-blowing unit EPFU optical cable, multiple stress sleeves are evenly distributed at equal intervals along the axial direction of the optical cable. The conical structure converts the gas kinetic energy into axial thrust, dispersing the air-blowing thrust from the front piston part to the entire length of the optical cable, avoiding the risk of optical cable breakage caused by single-point stress.

[0016] 2. For the high-performance polyethylene graphene air-blowing unit EPFU optical cable, the air cushion formed in the annular groove converts the solid friction between the optical cable and the underground pipeline into gas lubrication, reducing the friction coefficient.

[0017] 3. For the high-performance polyethylene graphene air-blowing unit EPFU optical cable, when an air cushion is formed in the annular groove, part of the high-pressure gas is transmitted backward through the corrugated waveguide groove. The corrugated waveguide groove with a wavy structure can increase the length of the gas flow path, making the pressure distribution more uniform, and thus reducing the air pressure fluctuation during the optical cable laying process, making the optical cable more stable during the laying process. At the same time, when the optical cable passes through the bending section of the underground pipeline, the optical cable will approach the inner wall of the underground pipeline, causing the local pressure in the annular groove to increase. By setting the corrugated waveguide groove, the locally excessive air pressure can be quickly released, making the optical cable more stable when passing through the bending section or turning section.

[0018] 4. For the high-performance polyethylene graphene air-blowing unit EPFU optical cable, when the gas discharged into the underground pipeline from the vertical hole acts on the inner wall of the underground pipeline, the optical cable forms a "floating" state, reducing the contact between the optical cable and the inner wall of the underground pipeline during the optical cable laying process, thereby reducing the friction force and the risk of the optical cable being pulled and broken during the optical cable laying process; At the same time, a part of the gas in the cavity is ejected from the inclined hole and blows towards the stress sleeve. After the gas impacts the stress sleeve, it is diverted backward, providing a forward thrust for the optical cable.

[0019] 5. For the high-performance polyethylene graphene air-blowing unit EPFU optical cable, when the gas is discharged from the inclined hole, under the guidance of the deflector, the stress sleeve rotates. The rotating stress sleeve will cause the discharged gas to generate a rotational force, providing auxiliary kinetic energy for the optical cable laying, and at the same time avoiding the risk of optical cable breakage caused by concentrated tensile force; in addition, the rotating stress sleeve can generate a gyroscopic effect during rotation to keep the optical cable axially stable; when the rotation direction is the same as the spiral groove rotation direction, a synergistic propulsion effect can also be generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the drawings: Figure 1 is a schematic structural diagram of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 1 ; Figure 2Structural schematic of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 2 ; Figure 3 Structural schematic of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 3 ; Figure 4 Structural schematic of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 4 ; Figure 5 Structural schematic of the sawtooth of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 6 Structural schematic of the stress sleeve of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 1 ; Figure 7 Structural schematic of the stress sleeve of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 2 ; Figure 8 Structural schematic of the stress sleeve of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 3 ; Figure 9 Structural schematic of the wave guide groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 1 ; Figure 10 Structural schematic of the wave guide groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 2 ; Figure 11 Structural schematic of the wave guide groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 3 ; Figure 12 Structural schematic of the spiral groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 1 ; Figure 13 Structural schematic of the spiral groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 2 ; Figure 14 Structural schematic of the spiral groove of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention Figure 3 ; Figure 15Schematic diagram of the stress sleeve and rubber ring of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 16 Schematic diagram of the vertical hole of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 17 Schematic diagram of the inclined hole of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 18 Schematic diagram of the flow guide vane of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 19 Schematic diagram of the flow guide vane and stress sleeve of a high-performance polyethylene graphene air-blowing unit EPFU optical cable proposed by the present invention; Figure 20 Schematic diagram of the air supply ring sleeve and the sealing box.

[0021] In the figure: 1. Optical cable; 11. Outer sleeve; 12. Filler; 121. Metal strip; 122. Cavity; 123. Vertical hole; 124. Inclined hole; 13. Inner sleeve; 131. Saw teeth; 14. Core; 15. Hollow tube; 16. Polyethylene fiber bundle; 17. Resin; 2. Rubber ring; 21. Annular groove; 3. Stress sleeve; 31. Horizontal hole; 32. Flow guide vane; 4. Wave guide groove; 41. Release ring groove; 5. Spiral groove. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0023] Embodiment 1: Refer to Figure 6 , Figure 7 , Figure 8 , a high-performance polyethylene graphene air-blowing unit EPFU optical cable includes: a plurality of stress sleeves 3 arranged horizontally on the outer periphery of the optical cable 1, and the stress sleeves 3 are used to block the gas when the gas is pumped into the underground pipeline; the outer diameter of the stress sleeve 3 is smaller than the inner diameter of the underground pipeline; a rubber ring 2 is arranged on the outer periphery of the optical cable 1 near the front end of the stress sleeve 3, and an annular groove 21 is formed between the rubber ring 2 and the stress sleeve 3, and an air cushion is formed in the annular groove 21; During laying, a piston part is installed at the front end of the optical cable 1 and inserted into the underground pipeline. When high-pressure gas is injected into the underground pipeline from the air blower, the gas impacts the piston part, driving the optical cable 1 to move in the underground pipeline for air-blowing laying; When the gas is filled into the underground pipeline, the gas will impact the force-bearing sleeves 3 installed on the outer periphery of the optical cable 1 at equal intervals. Since the force-bearing sleeves 3 are arranged horizontally and their outer diameters are smaller than the inner diameter of the pipeline, a pressure difference is formed on the front surface of the force-bearing sleeves 3. Part of the gas will push the force-bearing sleeves 3, causing the force-bearing sleeves 3 to be stressed. Therefore, it is possible to avoid the piston part being stressed alone, which may cause the optical cable 1 to be pulled or dragged. The effect brought by the force-bearing sleeve 3 is as follows: the conical structure of the force-bearing sleeve 3 blocks the straight flow of the gas, converting the kinetic energy of the gas into an axial thrust on the force-bearing sleeve 3. This force is transmitted to the entire optical cable 1 through the rigid connection between the force-bearing sleeve 3 and the outer sleeve 11 of the optical cable 1. Multiple force-bearing sleeves 3 are evenly distributed along the axial direction of the optical cable 1 (the spacing is 500 - 800 mm), ensuring that the gas thrust acts evenly on the entire length of the optical cable 1, and avoiding the occurrence of situations such as the optical cable 1 breaking or the internal wire core 14 being damaged due to local overloading of the force.

[0024] Among them, when the high-pressure gas pushes the force-bearing sleeve 3 forward, part of the gas will flow backward along the gap between the outer circumference of the force-bearing sleeve 3 and the inner wall of the underground pipeline, forming a "flow around". Since the outer diameter of the rubber ring 2 is smaller than that of the force-bearing sleeve 3, when the flow-around gas passes through the rubber ring 2, part of the gas will be drawn into the annular groove 21. At the same time, the high-speed air flow undergoes boundary layer separation at the front edge of the rubber ring 2, forming a low-pressure area, which attracts the gas to enter the annular groove 21. After the air flow bypasses the rubber ring 2, a wake vortex is formed, and part of the vortex energy is captured by the annular groove 21 to maintain the air pressure in the annular groove 21, thereby forming an air cushion in the annular groove 21, effectively reducing the contact between the outer surface of the optical cable 1 and the underground pipeline, and further reducing the friction of the air blowing, and improving the laying efficiency.

[0025] In another embodiment, a horizontal hole 31 is circumferentially opened on the front end face of the force-bearing sleeve 3 near the outer periphery of the outer sleeve 11, and the horizontal hole 31 is communicated with the annular groove 21. When the high-pressure gas is injected into the underground pipeline from the air blower and pushes the force-bearing sleeve 3, a high-pressure area is formed on the front end face of the force-bearing sleeve 3. Part of the gas enters the annular groove 21 through the horizontal hole 31. Since the outer diameter of the rubber ring 2 is smaller than the outer diameter of the force-bearing sleeve 3, the gas diffuses in the annular groove 21 and forms a local high-pressure air cushion. The air cushion pressure forces the gas to flow along the outer periphery of the rubber ring 2 towards the inner wall of the pipeline, forming an air film. The air film isolates the outer surface of the optical cable 1 from the inner wall of the underground pipeline, realizing the transformation from solid friction to gas lubrication, thereby effectively reducing the contact between the outer surface of the optical cable 1 and the underground pipeline, further reducing the friction of the air blowing, and improving the laying efficiency.

[0026] Example 2: Refer to Figure 1 、 Figure 2, A high-performance polyethylene graphene air-blown unit EPFU optical cable, which is basically the same as that in Embodiment 1. Furthermore: The optical cable 1 includes an inner sleeve 13 wrapping a core 14. The inner sleeve 13 is filled with a resin 17 to fix the core 14 during curing. An outer sleeve 11 is sleeved on the inner sleeve 13. The material of the outer sleeve 11 is: 90%-95% ultra-high molecular weight polyethylene, 5%-10% graphene microflakes, 0.5%-1% antioxidant, which can make the outer sleeve 11 have a lower friction coefficient, high wear resistance, and excellent impact resistance. A filler 12 is filled between the inner sleeve 13 and the outer sleeve 11. The inner sleeve 13 is made of modified polybutylene terephthalate and has good tensile strength. The filler 12 is a high-strength epoxy resin adhesive or fiber paste, which can make the optical cable 1 have good tensile properties during air-blown laying and reduce the risk of breakage.

[0027] Embodiment 3: Refer to Figure 3 Or 4, A high-performance polyethylene graphene air-blown unit EPFU optical cable, which is basically the same as that in Embodiment 1. Furthermore: The optical cable 1 includes an inner sleeve 13 sleeved with a hollow tube 15. The core 14 is arranged between the inner sleeve 13 and the hollow tube 15, and a resin 17 is filled between the inner sleeve 13 and the hollow tube 15. A polyethylene fiber bundle 16 is arranged in the hollow tube 15. An outer sleeve 11 is sleeved on the inner sleeve 13, and a filler 12 is filled between the inner sleeve 13 and the outer sleeve 11; The material of the outer sleeve 11 is: 90%-95% ultra-high molecular weight polyethylene, 5%-10% graphene microflakes, 0.5%-1% antioxidant, which can make the outer sleeve 11 have a lower friction coefficient, high wear resistance, and excellent impact resistance. A filler 12 is filled between the inner sleeve 13 and the outer sleeve 11. The inner sleeve 13 is made of modified polybutylene terephthalate and has good tensile strength. The filler 12 is a high-strength epoxy resin adhesive or fiber paste. The hollow tube 15 is filled with a high-strength polyethylene fiber bundle 16, forming a composite reinforcement system with the hollow tube 15, which not only reduces the weight but also improves the longitudinal tensile load-bearing capacity, can make the optical cable 1 have good tensile properties during air-blown laying, and reduces the risk of breakage.

[0028] Sawteeth 131 are arranged on the inner wall of the outer sleeve 11 and the outer wall of the inner sleeve 13 to improve the adhesion of the filler 12.

[0029] Embodiment 4: Refer to Figure 9 、 Figure 10 、 Figure 11, A high-performance polyethylene graphene air-blowing unit EPFU optical cable, which is basically the same as that of Embodiment 2 or 3. Further, a plurality of wave guide grooves 4 are circumferentially formed on the outer periphery of the outer sleeve 11. One end of the wave guide groove 4 leads to the annular groove 21, and the other end of the wave guide groove 4 is provided with a release ring groove 41 on the outer sleeve 11. The release ring groove 41 is communicated with the other end of the wave guide groove 4.

[0030] When an air cushion is formed in the annular groove 21, part of the high-pressure gas is transmitted backward through the wave guide groove 4. The wave guide groove 4 with a wave-shaped structure can increase the length of the gas flow path, make the pressure distribution more uniform, and further reduce the air pressure fluctuation during the laying of the optical cable 1, making the optical cable 1 more stable during the laying process.

[0031] At the same time, when the optical cable 1 passes through the bending section of the underground pipeline, the optical cable 1 will approach the inner wall of the underground pipeline, causing the local pressure in the annular groove 21 to increase. The provided wave guide groove 4 can quickly release the locally excessive air pressure, making the optical cable 1 more stable when passing through the bending section or turning section.

[0032] Further, when the optical cable 1 is under tension, the wave guide groove 4 undergoes elastic deformation to absorb the tensile energy, greatly improving the tensile performance of the optical cable 1.

[0033] Embodiment 5: Refer to Figure 12 、 Figure 13 、 Figure 14 , A high-performance polyethylene graphene air-blowing unit EPFU optical cable, which is basically the same as that of Embodiment 2 or 3. Further, a spiral groove 5 is circumferentially formed on the outer periphery of the outer sleeve 11; The air flow forms a rotating air flow field along the spiral groove 5, which can further provide forward kinetic energy for the laying of the optical cable 1.

[0034] Embodiment 6: Refer to Figure 2 、 Figure 4 、 Figure 15 、 Figure 16 、 Figure 17 , A high-performance polyethylene graphene air-blowing unit EPFU optical cable, which is basically the same as that of Embodiment 4 or 5. Further, a plurality of groups of metal strip pieces 121 are symmetrically and fixedly connected between the outer periphery of the inner sleeve 13 and the inner wall of the outer sleeve 11, and cavities 122 are formed between each group of metal strip pieces 121.

[0035] Vertical holes 123 are circumferentially formed on the outer sleeve 11 located in the annular groove 21, and the vertical holes 123 are communicated with the cavities 122. Oblique holes 124 are circumferentially formed on the outer sleeve 11 located in the force-bearing sleeve 3, and one end of the oblique holes 124 faces the inner wall of the force-bearing sleeve 3.

[0036] Refer to Figure 20, an air supply collar is provided and sleeved on the optical cable 1. The air blower supplies air to the air supply collar. A gasket is provided on the inner wall of the air supply collar, which can wrap the optical cable 1. The length of the air supply collar is greater than the distance between three stress sleeves 3 on the optical cable 1. Therefore, the gas from the air blower enters the cavity 122 of the optical cable 1 through the air supply collar, the vertical hole 123, and the inclined hole 124, and then is filled into the underground pipeline. During this process, the gas discharged from the vertical hole 123 into the underground pipeline acts on the inner wall of the underground pipeline, making the optical cable 1 in a "floating" state, reducing the contact between the optical cable 1 and the inner wall of the underground pipeline during laying, thereby reducing the friction and minimizing the risk of the optical cable 1 being broken during laying.

[0037] At the same time, a part of the gas in the cavity 122 is ejected from the inclined hole 124 and blows towards the stress sleeve 3. After the gas impacts the stress sleeve 3, the gas is deflected backward, providing a forward thrust for the optical cable 1.

[0038] Furthermore, the stress sleeve 3 is made of thermoplastic elastomer, silicone rubber or EPDM rubber material and has a certain flexibility.

[0039] Refer to Figure 20 , in this embodiment, in order to prevent the gas in the cavity 122 from leaking out of the wound optical cable 1, a sealed box is provided, and the wound optical cable 1 is placed in the sealed box and pumped with gas. Therefore, there will be no air leakage problem during laying.

[0040] Furthermore, when the core 14 in the optical cable 1 generates heat after the optical cable 1 is laid, a part of the heat can be conducted through the metal strip 121 to prevent heat concentration from affecting the transmission efficiency of the optical cable 1.

[0041] Furthermore, after the optical cable 1 is laid, oil can be poured into the cavity 122. Since the aperture of the vertical hole 123 is small and the oil has a certain viscosity, the oil can remain in the cavity 122. When the optical cable 1 generates heat, the heat can be further conducted through the oil in the cavity 122, enabling the optical cable 1 to have the ability of self-heat dissipation and heat conduction.

[0042] Embodiment 7: Refer to Figure 18 、 Figure 19 , a high-performance polyethylene graphene air-blown unit EPFU optical cable is basically the same as Embodiment 6. Furthermore: the stress sleeve 3 is rotatably connected to the outer sleeve 11, and a plurality of guide vanes 32 are fixedly connected to the inner wall of the stress sleeve 3 in a circumferential manner.

[0043] When the gas is discharged from the inclined hole 124, under the guidance of the guide vane 32, the stress sleeve 3 rotates, and the rotating stress sleeve 3 will cause the discharged gas to generate a rotational force, providing auxiliary kinetic energy for the laying of the optical cable 1, and at the same time being able to prevent the tensile force of the optical cable 1 from being concentrated and resulting in the risk of fracture; In addition, the rotating stress-bearing sleeve 3 can generate the gyroscopic effect during rotation to keep the optical cable 1 axially stable; When the rotation direction is the same as the helix direction of the helical groove 5, a synergistic propulsion effect can also be generated; Therefore, the rotating stress-bearing sleeve structure significantly improves the laying efficiency, reliability and service life of the blown optical cable 1, and is particularly suitable for the construction of communication projects with long distances and complex paths.

[0044] Example 8: Refer to Figures 1 - 20 , a method for preparing a high-performance polyethylene graphene blown unit EPFU optical cable, comprising the following steps: S1. Prepare the outer sleeve 11: 90%-95% ultra-high molecular weight polyethylene, 5%-10% graphene microflakes, 0.5%-1% antioxidant (a compound of phenolic primary antioxidant and phosphite secondary antioxidant); S2. Prepare the inner sleeve 13: 90%-95% polybutylene terephthalate (PBT), 20%-30% glass fiber (length 3-5 mm), 1%-2% silicone masterbatch (content 50%), 0.5%-1% ultraviolet absorber (benzotriazole type); S3. Prepare the hollow tube 15: modified PBT material; S4. Prepare the metal strip 121: made of stainless steel or aluminum alloy material, with nickel plating treatment on the surface.

[0045] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content according to the technical content disclosed above to obtain equivalent embodiments with equivalent changes. However, as long as the content does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high-performance polyethylene graphene air-blown unit EPFU optical cable, characterized in that, Including: A plurality of stress sleeves (3) arranged horizontally on the outer periphery of the optical cable (1), and the stress sleeves (3) are used to block the gas when the gas is pumped into the underground pipeline; The outer diameter of the stress sleeve (3) is smaller than the inner diameter of the underground pipeline; A rubber ring (2) is arranged on the outer periphery of the optical cable (1) near the front end of the stress sleeve (3), an annular groove (21) is formed between the rubber ring (2) and the stress sleeve (3), and an air cushion is formed in the annular groove (21); The stress sleeve (3) is conical, and a horizontal hole (31) is circumferentially opened at the front end face of the stress sleeve (3) near the outer periphery of the outer sleeve (11), and the horizontal hole (31) is communicated with the annular groove (21).

2. The high-performance polyethylene graphene air-blowing unit EPFU optical cable according to claim 1, characterized in that The optical cable (1) includes an inner sleeve (13) wrapping a wire core (14), a resin (17) is filled in the inner sleeve (13), an outer sleeve (11) is sleeved on the inner sleeve (13), and a filler (12) is filled between the inner sleeve (13) and the outer sleeve (11).

3. A high-performance polyethylene graphene air-blowing unit EPFU optical cable according to claim 1, characterized in that, The optical cable (1) includes an inner sleeve (13) sleeved with a hollow tube (15), a wire core (14) is arranged between the inner sleeve (13) and the hollow tube (15), a resin (17) is filled between the inner sleeve (13) and the hollow tube (15), a polyethylene fiber bundle (16) is arranged in the hollow tube (15), an outer sleeve (11) is sleeved on the inner sleeve (13), and a filler (12) is filled between the inner sleeve (13) and the outer sleeve (11).

4. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 2 or 3, characterized in that, A plurality of wave guide grooves (4) are circumferentially opened on the outer periphery of the outer sleeve (11), one end of the wave guide groove (4) leads to the annular groove (21), and a release ring groove (41) is opened on the outer sleeve (11) at the other end of the wave guide groove (4), and the release ring groove (41) is communicated with the other end of the wave guide groove (4).

5. The high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 4, characterized in that, A spiral groove (5) is circumferentially opened on the outer periphery of the outer sleeve (11).

6. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 2 or 3, characterized in that A plurality of groups of metal strip pieces (121) are symmetrically fixedly connected between the outer periphery of the inner sleeve (13) and the inner wall of the outer sleeve (11), and a cavity (122) is formed between each group of the metal strip pieces (121).

7. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 6, characterized in that Vertical holes (123) are circumferentially opened on the outer sleeve (11) located in the annular groove (21), the vertical holes (123) are communicated with the cavity (122), and inclined holes (124) are circumferentially opened on the outer sleeve (11) located in the stress sleeve (3), and one end of the inclined hole (124) faces the inner wall of the stress sleeve (3).

8. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 6, characterized in that, The stress sleeve (3) is rotatably connected to the outer sleeve (11), and a plurality of guide vanes (32) are circumferentially fixedly connected to the inner wall of the stress sleeve (3).

9. A preparation method of a high-performance polyethylene graphene air-blown unit EPFU optical cable, characterized in that, Adopting a high-performance polyethylene graphene air blowing unit EPFU optical cable as described in claim 5, including the following steps: S1. Prepare the outer sleeve (11): 90%-95% ultra-high molecular weight polyethylene, 5%-10% graphene microflakes, 0.5%-1% antioxidant; S2. Prepare the inner sleeve (13): Polybutylene terephthalate: 90% - 95%, glass fiber: 20% - 30%, silicone masterbatch: 1% - 2%, ultraviolet absorber: 0.5% - 1%; S3. Prepare the hollow tube (15): Modified PBT material; S4. Prepare the metal strip (121): Stainless steel or aluminum alloy material, surface nickel-plated treatment.

Images