A high-performance polyethylene graphene air-blown unit EPFU optical cable and its preparation method

Abstract

The present invention discloses a high-performance polyethylene graphene air-blown unit (EPFU) optical cable and a preparation method, and relates to the field of optical cable technology. A high-performance polyethylene graphene air-blown unit (EPFU) optical cable comprises: a plurality of force-bearing sleeves arranged transversely on the outer circumference of the optical cable, the force-bearing sleeves being used to shield the gas when the gas is pumped into the underground pipeline; the outer diameter of the force-bearing sleeves being smaller than the inner diameter of the underground pipeline; a rubber ring arranged on the outer circumference of the optical cable near the front end of the force-bearing sleeve, an annular groove being formed between the rubber ring and the force-bearing sleeve, and an air cushion being formed in the annular groove; the present invention arranges a plurality of force-bearing sleeves distributed at equal intervals along the axial direction of the optical cable, and the conical structure converts the kinetic energy of the gas into axial thrust, and disperses the air-blowing thrust from the front piston to the entire length of the optical cable, thereby avoiding the risk of optical cable breakage caused by single-point force.

Description

Technical Field

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

[0002] EPFU optical cables are constructed by curing the cores into a photosensitive resin in a specific arrangement, then extruding a special low-friction sheath. Some products use high-performance polyethylene as the primary sheath component, with additives such as graphene added to enhance performance. Graphene, with its excellent mechanical, thermal, and electrical conductivity, can be added to polyethylene to improve the sheath's strength, abrasion resistance, and aging resistance, while also reducing the coefficient of friction, making the cable more suitable for air-blown installation.

[0003] Air-blown fiber optic cabling utilizes compressed gas (usually air) to propel optical or electrical cables through conduits. This technology is primarily used for fiber or electrical cabling, particularly in locations where manual installation is difficult, such as long underground conduits. Air-blown fiber optic cabling offers advantages such as efficient cabling, minimal damage, long-distance cabling, reduced labor intensity, and high scalability. Therefore, it is widely used in the telecommunications industry and other applications requiring long-distance cable installation.

[0004] When laying air-blown optical cable, a piston is installed at the front end of the optical cable. The outer periphery of the piston is in contact with the inner wall of the underground pipeline. Air is pumped into the underground pipeline through high-pressure inflation equipment to push the piston to move, thereby pulling the optical cable for air-blowing laying. This laying method has high requirements on the strength of the optical cable. Since the piston is only set at the front end of the optical cable, the force point will be located at the front end of the optical cable. As a result, during the laying process, the optical cable will be broken or the internal core will be damaged due to the concentration of force points. In addition, the optical cable will be dragged on the underground pipeline, causing wear on the cable surface and increasing friction, which will affect the efficiency of air-blown optical cable laying. For this reason, a high-performance polyethylene graphene air-blown unit EPFU optical cable is proposed. Summary of the Invention

[0005] 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 air-blown unit EPFU optical cable that can overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a high-performance polyethylene graphene air-blown unit EPFU optical cable, comprising: a plurality of force-bearing sleeves arranged laterally on the outer circumference of the optical cable, the force-bearing sleeves being used to shield 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, arranged on the outer circumference of the optical cable near the front end of the force-bearing sleeve, an annular groove being formed between the rubber ring and the force-bearing sleeve, and an air cushion being formed in the annular groove.

[0007] Preferably, the optical cable comprises an inner sleeve wrapping 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.

[0008] Preferably, the optical cable includes an inner sleeve with a hollow tube, the wire core is arranged between the inner sleeve and the hollow tube, and 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 arranged on the inner sleeve, and a filler is filled between the inner sleeve and the outer sleeve.

[0009] Preferably, the force-bearing sleeve is conical, and a horizontal hole is circumferentially opened on the front end surface of the force-bearing sleeve near the outer circumference of the outer sleeve, and the horizontal hole is connected to the annular groove.

[0010] Furthermore, a plurality of wave guide grooves are provided on the circumference of the outer sleeve, one end of the wave guide groove leads to the annular groove, and the other end of the wave guide groove is provided with a release ring groove on the outer sleeve, and the release ring groove is connected to the other end of the wave guide groove.

[0011] Furthermore, a spiral groove is provided on the outer circumference of the outer sleeve.

[0012] Furthermore, a plurality of groups of metal strips are symmetrically fixedly connected between the outer periphery of the inner sleeve and the inner wall of the outer sleeve, and a cavity is formed between each group of the metal strips.

[0013] Furthermore, a vertical hole is opened on the circumference of the outer sleeve located in the annular groove, and the vertical hole is communicated with the cavity. An inclined hole is opened on the circumference of the outer sleeve located in the force-bearing sleeve, and one end of the inclined hole faces the inner wall of the force-bearing sleeve.

[0014] Furthermore, the force-bearing sleeve is rotatably connected to the outer sleeve, and a plurality of guide plates are fixedly connected to the circumference of the inner wall of the force-bearing sleeve.

[0015] A method for preparing a high-performance polyethylene graphene air-blown unit (EPFU) optical cable comprises the following steps:

[0016] S1. Preparation of outer sleeve: ultra-high molecular weight polyethylene 90%-95%, graphene microsheets 5%-10%, antioxidant 0.5%-1%;

[0017] S2. Preparation of inner sleeve: polybutylene terephthalate: 90%-95%, glass fiber: 20%-30%, silicone masterbatch: 1%-2%, ultraviolet absorber: 0.5%-1%;

[0018] S3. Preparation of hollow tube: modified PBT material;

[0019] S4. Preparation of long metal strips: stainless steel or aluminum alloy material, with nickel plating on the surface.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. This high-performance polyethylene graphene air-blown unit EPFU optical cable has multiple force-bearing sleeves distributed at equal intervals along the axial direction of the cable. The conical structure converts the kinetic energy of the gas into axial thrust, and disperses the air-blowing thrust from the front piston to the entire length of the cable, avoiding the risk of cable breakage caused by single-point force.

[0022] 2. The high-performance polyethylene graphene air-blown unit EPFU optical cable has an air cushion formed in the annular groove, which converts the solid friction between the optical cable and the underground pipeline into gas lubrication, reducing the friction coefficient.

[0023] 3. This high-performance polyethylene graphene air-blown unit (EPFU) optical cable, when an air cushion forms within the annular groove, transmits some of the high-pressure gas backward through the wave guide groove. The wavy structure of the wave guide groove increases the length of the gas flow path, making the pressure distribution more uniform, thereby reducing pressure fluctuations during cable laying and making the cable more stable during installation. Furthermore, when the cable passes through a bend in an underground pipeline, it approaches the inner wall of the underground pipeline, causing local pressure in the annular groove to increase. The wave guide groove can quickly release the localized excessive pressure, making the cable more stable during the bend or turn.

[0024] 4. This high-performance polyethylene graphene air-blown 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, makes the optical cable "suspended", reducing the contact between the optical cable and the inner wall of the underground pipeline during the laying process, thereby reducing friction and reducing the risk of the optical cable being broken during the laying process;

[0025] At the same time, part of the gas in the cavity is ejected from the inclined hole and blown toward the stress-bearing sleeve. After the gas impacts the stress-bearing sleeve, the gas is directed backward, providing forward thrust for the optical cable.

[0026] 5. For this high-performance polyethylene graphene air-blown unit EPFU optical cable, when the gas is discharged from the inclined hole, it is guided by the guide plate and the force-bearing sleeve rotates. The rotating force-bearing sleeve causes the discharged gas to generate rotational force, providing auxiliary kinetic energy for the laying of the optical cable, while avoiding the risk of breakage caused by concentrated tension in the optical cable. In addition, the rotating force-bearing sleeve can produce a gyroscopic effect during rotation to keep the optical cable axially stable. When the rotation direction is the same as that of the spiral groove, a synergistic propulsion effect can also be generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached figure:

[0028] Figure 1 Schematic diagram of the structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 1 ;

[0029] Figure 2 Schematic diagram of the structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 2 ;

[0030] Figure 3 Schematic diagram of the structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 3 ;

[0031] Figure 4 Schematic diagram of the structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 4 ;

[0032] Figure 5 This is a schematic structural diagram of the sawtooth structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention;

[0033] Figure 6 Schematic diagram of the structure of the stress-bearing sleeve of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 1 ;

[0034] Figure 7 Schematic diagram of the structure of the stress-bearing sleeve of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 2 ;

[0035] Figure 8 Schematic diagram of the structure of the stress-bearing sleeve of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 3 ;

[0036] Figure 9 Schematic diagram of the structure of the wave guide groove of the high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 1 ;

[0037] Figure 10 Schematic diagram of the structure of the wave guide groove of the high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 2 ;

[0038] Figure 11 Schematic diagram of the structure of the wave guide groove of the high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 3 ;

[0039] Figure 12 Schematic diagram of the spiral groove structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 1 ;

[0040] Figure 13 Schematic diagram of the spiral groove structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 2 ;

[0041] Figure 14 Schematic diagram of the spiral groove structure of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention Figure 3 ;

[0042] Figure 15 This is a structural diagram of the stress-bearing sleeve and rubber ring of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention;

[0043] Figure 16 This is a schematic structural diagram of a vertical hole in a high-performance polyethylene graphene air-blown unit (EPFU) optical cable proposed by the present invention;

[0044] Figure 17 This is a schematic structural diagram of the oblique hole of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention;

[0045] Figure 18 This is a schematic structural diagram of a guide plate for a high-performance polyethylene graphene air-blown unit (EPFU) optical cable proposed by the present invention;

[0046] Figure 19 This is a structural diagram of the guide plate and stress-bearing sleeve of a high-performance polyethylene graphene air-blown unit EPFU optical cable proposed by the present invention;

[0047] Figure 20 Schematic diagram of the air supply ring sleeve and sealing box.

[0048] In the figure: 1. Optical cable; 11. Outer sleeve; 12. Filler; 121. Metal strip; 122. Cavity; 123. Vertical hole; 124. Oblique hole; 13. Inner sleeve; 131. Sawtooth; 14. Wire core; 15. Hollow tube; 16. Polyethylene fiber bundle; 17. Resin; 2. Rubber ring; 21. Annular groove; 3. Force-bearing sleeve; 31. Horizontal hole; 32. Guide plate; 4. Wave guide groove; 41. Release ring groove; 5. Spiral groove. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the 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.

[0050] Example 1: Reference Figure 6 、 Figure 7 、 Figure 8 A high-performance polyethylene graphene air-blown unit (EPFU) optical cable comprises: a plurality of force-bearing sleeves 3 arranged transversely on the outer circumference of an optical cable 1, the force-bearing sleeves 3 being used to shield the gas when it is pumped into an underground pipeline; the outer diameter of the force-bearing sleeves 3 being smaller than the inner diameter of the underground pipeline; a rubber ring 2 disposed on the outer circumference of the optical cable 1 near the front end of the force-bearing sleeves 3, an annular groove 21 being formed between the rubber ring 2 and the force-bearing sleeves 3, and an air cushion being formed in the annular groove 21;

[0051] During laying, a piston 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 blowing machine, the gas impacts the piston, driving the optical cable 1 to move in the underground pipeline, and air blowing laying is performed;

[0052] When the gas is filled into the underground pipeline, it will impact the force-bearing sleeves 3 installed at equal intervals on the outer circumference of the optical cable 1. Since the force-bearing sleeves 3 are arranged horizontally and their outer diameters are smaller than the inner diameter of the pipeline, the gas forms a pressure difference 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. This can prevent the piston from being stressed alone, which would cause the optical cable 1 to be pulled or dragged.

[0053] The effect brought about by the force-bearing sleeve 3 is: the conical structure of the force-bearing sleeve 3 blocks the straight-line flow of gas, so that the kinetic energy of the gas is converted into an axial thrust on the force-bearing sleeve 3, and the 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 (spacing 500-800mm), ensuring that the gas thrust acts evenly on the entire length of the optical cable 1, avoiding local overload and the occurrence of breakage of the optical cable 1 or damage to the internal core 14.

[0054] 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 "circumferential flow". Since the outer diameter of the rubber ring 2 is smaller than the force-bearing sleeve 3, part of the circumferential gas will be drawn into the annular groove 21 when passing through the rubber ring 2. At the same time, the high-speed airflow undergoes boundary layer separation at the leading edge of the rubber ring 2, forming a low-pressure area, which attracts gas into the annular groove 21. After the airflow bypasses the rubber ring 2, a wake vortex is formed. Part of the vortex energy is captured by the annular groove 21, maintaining the air pressure in the annular groove 21, and then 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, thereby reducing the friction of the air blowing and improving the laying efficiency.

[0055] In another embodiment, a horizontal hole 31 is formed on the front end surface of the force-bearing sleeve 3 near the outer circumference of the outer sleeve 11, and the horizontal hole 31 is connected to the annular groove 21;

[0056] When high-pressure gas is injected into the underground pipeline from the air blowing machine and pushes the force-bearing sleeve 3, the gas forms a high-pressure area on the front end surface of the force-bearing sleeve 3, and 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 circumference of the rubber ring 2 to 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, thereby reducing the friction of the air blowing and improving the laying efficiency.

[0057] Example 2: Reference Figure 1 、 Figure 2 , a high-performance polyethylene graphene air-blown unit EPFU optical cable, which is basically the same as Example 1, further comprising: the optical cable 1 includes an inner sleeve 13 wrapped with a core 14, the inner sleeve 13 is filled with resin 17, for fixing the core 14 during curing, an outer sleeve 11 is sleeved on the inner sleeve 13, and the material of the outer sleeve 11 is: 90%-95% ultra-high molecular weight polyethylene, 5%-10% graphene microsheets, and 0.5%-1% antioxidant, which can enable the outer sleeve 11 to have a low friction coefficient, high wear resistance, and excellent impact resistance, and 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, which has good tensile strength, and the filler 12 is a high-strength epoxy resin adhesive or fiber paste, which can enable the optical cable 1 to have good tensile performance during air-blowing laying and reduce the risk of breaking.

[0058] Example 3: Reference Figure 3Or 4, a high-performance polyethylene graphene air-blown unit EPFU optical cable, which is basically the same as Example 1, further comprising: the optical cable 1 includes an inner sleeve 13 provided with a hollow tube 15, a 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 provided on the inner sleeve 13, and a filler 12 is filled between the inner sleeve 13 and the outer sleeve 11;

[0059] The material of the outer sleeve 11 is: ultra-high molecular weight polyethylene 90%-95%, graphene microsheets 5%-10%, and antioxidant 0.5%-1%, which can make the outer sleeve 11 have a low friction coefficient, high wear resistance, and excellent impact resistance. The filler 12 is filled between the inner sleeve 13 and the outer sleeve 11. The inner sleeve 13 adopts 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 high-strength polyethylene fiber bundles 16, which form a composite reinforcement system with the hollow tube 15, which reduces the weight and improves the longitudinal tensile bearing capacity. It can make the optical cable 1 have good tensile properties during air blowing laying and reduce the risk of breaking.

[0060] The inner wall of the outer sleeve 11 and the outer wall of the inner sleeve 13 are provided with serrations 131 to improve the adhesion of the filler 12 .

[0061] Example 4: Reference Figure 9 、 Figure 10 、 Figure 11 A high-performance polyethylene graphene air-blown unit EPFU optical cable is basically the same as Example 2 or 3, and further: a plurality of wave guide grooves 4 are opened on the circumference 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 opened on the outer sleeve 11 with a release ring groove 41, and the release ring groove 41 is connected to the other end of the wave guide groove 4.

[0062] 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 wavy structure can increase the length of the gas flow path and make the pressure distribution more uniform, thereby reducing the air pressure fluctuation during the laying of the optical cable 1, making the optical cable 1 more stable during the laying process.

[0063] At the same time, when the optical cable 1 passes through the curved section of the underground pipeline, the optical cable 1 will approach the inner wall of the underground pipeline, causing the local pressure of the annular groove 21 to increase. The wave guide groove 4 provided can quickly release the local excessive air pressure, making the optical cable 1 more stable when passing through the curved section or turning section.

[0064] Furthermore, when the optical cable 1 is pulled, the wave guide groove 4 undergoes elastic deformation to absorb the tensile energy, thereby significantly improving the tensile performance of the optical cable 1.

[0065] Example 5: Reference Figure 12 、 Figure 13 、 Figure 14 , a high-performance polyethylene graphene air-blown unit EPFU optical cable, which is basically the same as embodiment 2 or 3, further comprising: a spiral groove 5 is opened on the outer circumference of the outer sleeve 11;

[0066] The airflow forms a rotating airflow field along the spiral groove 5 , which can further provide forward kinetic energy for the laying of the optical cable 1 .

[0067] Example 6: Reference Figure 2 、 Figure 4 、 Figure 15 、 Figure 16 、 Figure 17 A high-performance polyethylene graphene air-blown unit EPFU optical cable is basically the same as Example 4 or 5, and furthermore: a plurality of groups of metal long strips 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 metal long strips 121.

[0068] A vertical hole 123 is opened on the circumference of the outer sleeve 11 located in the annular groove 21, and the vertical hole 123 is connected to the cavity 122. An inclined hole 124 is opened on the circumference of the outer sleeve 11 located in the force-bearing sleeve 3, and one end of the inclined hole 124 faces the inner wall of the force-bearing sleeve 3.

[0069] Reference Figure 20 , an air supply ring is provided, which is sleeved on the optical cable 1, and air is supplied to the air supply ring by an air blower. A sealing gasket is provided on the inner wall of the air supply ring, which can wrap the optical cable 1. The length of the air supply ring is greater than the spacing between the three force-bearing sleeves 3 on the optical cable 1. Therefore, the gas of the air blower enters the cavity 122 of the optical cable 1 through the air supply ring, the vertical hole 123, and the inclined hole 124, and then is filled into the underground pipeline. During this process, the gas discharged into the underground pipeline from the vertical hole 123 will act on the inner wall of the underground pipeline, making the optical cable 1 "suspended", reducing the contact between the optical cable 1 and the inner wall of the underground pipeline during the laying process, thereby reducing the friction and reducing the risk of the optical cable 1 being pulled apart during the laying process.

[0070] At the same time, part of the gas in the cavity 122 is ejected from the inclined hole 124 and blown toward the stress-bearing sleeve 3 . After the gas impacts the stress-bearing sleeve 3 , the gas is directed backward, providing forward thrust for the optical cable 1 .

[0071] Furthermore, the force-bearing sleeve 3 is made of thermoplastic elastomer, silicone rubber or EPDM rubber material and has a certain degree of softness.

[0072] Reference Figure 20 In this embodiment, in order to prevent the gas in the cavity 122 from leaking from the wound optical cable 1, a sealing box is provided, the wound optical cable 1 is placed in the sealing box, and air is pumped into the sealing box, so that no air leakage problem occurs during laying.

[0073] Furthermore, after the optical cable 1 is laid, when the core 14 in the optical cable 1 generates heat, part of the heat can be conducted through the long metal strip 121 , thereby preventing heat concentration from affecting the transmission efficiency of the optical cable 1 .

[0074] Furthermore, after the optical cable 1 is laid, oil can be poured into the cavity 122. Since the vertical hole 123 has a small aperture and the oil has a certain viscosity, the oil can remain in the cavity 122. When the optical cable 1 heats up, the heat can be further conducted through the oil in the cavity 122, so that the optical cable 1 has the ability to dissipate heat and conduct heat independently.

[0075] Example 7: Reference Figure 18 、 Figure 19 A high-performance polyethylene graphene air-blown unit EPFU optical cable is basically the same as Example 6, and furthermore: the force-bearing sleeve 3 is rotatably connected to the outer sleeve 11, and a plurality of guide plates 32 are fixedly connected to the inner wall of the force-bearing sleeve 3 on the circumference.

[0076] When the gas is discharged from the inclined hole 124, it is guided by the guide plate 32, causing the force-bearing sleeve 3 to rotate. The rotating force-bearing sleeve 3 causes the discharged gas to generate a rotational force, providing auxiliary kinetic energy for laying the optical cable 1, while avoiding the risk of breakage caused by concentrated tension on the optical cable 1.

[0077] In addition, the rotating force-bearing sleeve 3 can generate a gyroscopic effect during rotation to keep the optical cable 1 axially stable;

[0078] When the rotation direction is the same as that of the spiral groove 5, a synergistic propulsion effect can be generated.

[0079] Therefore, the rotating force-bearing sleeve structure significantly improves the laying efficiency, reliability and service life of the air-blown optical cable 1, and is particularly suitable for the construction of communication projects with long distances and complex paths.

[0080] Example 8: Reference Figures 1-20 A method for preparing a high-performance polyethylene graphene air-blown unit (EPFU) optical cable comprises the following steps:

[0081] S1. Preparation of outer sleeve 11: ultra-high molecular weight polyethylene 90%-95%, graphene microplatelets 5%-10%, antioxidant (phenolic primary antioxidant and phosphite auxiliary antioxidant compound) 0.5%-1%;

[0082] S2. Preparation of inner sleeve 13: polybutylene terephthalate (PBT): 90%-95%, glass fiber (length 3-5 mm): 20%-30%, silicone masterbatch (content 50%): 1%-2%, ultraviolet absorber (benzotriazole): 0.5%-1%;

[0083] S3, preparing hollow tube 15: modified PBT material;

[0084] S4. Prepare the metal strip 121: stainless steel or aluminum alloy material, with nickel plating on the surface.

[0085] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A high-performance polyethylene graphene air-blown unit EPFU optical cable, characterized in that: include: A plurality of stress-bearing sleeves (3) arranged transversely on the outer periphery of the optical cable (1), wherein the stress-bearing sleeves (3) are used to shield the gas when the gas is pumped into the underground pipeline; The outer diameter of the stress-bearing 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 force-bearing sleeve (3), an annular groove (21) is formed between the rubber ring (2) and the force-bearing sleeve (3), and an air cushion is formed in the annular groove (21); The force-bearing sleeve (3) is tapered, and a horizontal hole (31) is provided on the front end surface of the force-bearing sleeve (3) near the outer circumference of the outer sleeve (11), and the horizontal hole (31) is connected to the annular groove (21); The optical cable (1) comprises an inner sleeve (13) enclosing a core (14), the inner sleeve (13) being filled with a resin (17), an outer sleeve (11) being sleeved on the inner sleeve (13), and a filler (12) being filled between the inner sleeve (13) and the outer sleeve (11); Multiple groups of metal long strips (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 long strips (121); A vertical hole (123) is provided on the circumference of the outer sleeve (11) located in the annular groove (21), and the vertical hole (123) is communicated with the cavity (122). An inclined hole (124) is provided on the circumference of the outer sleeve (11) located in the force-bearing sleeve (3), and one end of the inclined hole (124) faces the inner wall of the force-bearing sleeve (3).

2. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 1, characterized in that: The optical cable (1) comprises 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), 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).

3. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 1 or 2, characterized in that: A plurality of wave guide grooves (4) are provided on the outer circumference 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 annular groove (41) on the outer sleeve (11), and the release annular groove (41) is connected to the other end of the wave guide groove (4).

4. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 3, characterized in that: A spiral groove (5) is provided on the outer circumference of the outer sleeve (11).

5. A high-performance polyethylene graphene air-blown unit EPFU optical cable according to claim 1, characterized in that: The force-bearing sleeve (3) is rotatably connected to the outer sleeve (11), and a plurality of guide plates (32) are fixedly connected to the inner wall of the force-bearing sleeve (3).

6. A method for preparing a high-performance polyethylene graphene air-blown unit EPFU optical cable, characterized in that: Using a high-performance polyethylene graphene air-blown unit EPFU optical cable as claimed in claim 4, comprising the following steps: S1. Preparation of outer sleeve (11): ultra-high molecular weight polyethylene 90%-95%, graphene microsheets 5%-10%, antioxidant 0.5%-1%; S2. Preparation of inner sleeve (13): polybutylene terephthalate: 90%-95%, glass fiber: 20%-30%, silicone masterbatch: 1%-2%, ultraviolet absorber: 0.5%-1%; S3. Preparation of hollow tube (15): modified PBT material; S4. Preparation of metal strips (121): stainless steel or aluminum alloy material, with surface nickel plating.

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