Self-supporting portable optical cable used for overhead

Abstract

The overhead self-supporting portable optical cable comprises a cable core, a reinforcing piece and an outer sheath, the reinforcing piece comprises an FRP rod and three delta-shaped reinforcing belts, the FRP rod is arranged outside the cable core, the three delta-shaped reinforcing belts form a triangular structure and wrap the FRP rod, and the outer sheath wraps the delta-shaped reinforcing belts. According to the invention, the FRP rods play a role in assisting in tensile strength and filling the cable core structure, the triangular glass fiber reinforcing tape is used as a main tensile element to support the optical cable structure and play a moisture-proof role, and the design of the triangular reinforcer and the triangular structure can reduce the use amount of the glass fiber tape, reduce the weight of the optical cable, and reduce the cost of the optical cable. The triangular structure can realize a stable optical cable structure with least tensile elements.

Description

Technical Field

[0001] The invention relates to the technical field of optical cables, and in particular to an aerial self-supporting lightweight optical cable. Background Art

[0002] With the vigorous development of optical fiber communication, optical fiber has been widely used in various fields with its excellent performance such as high bandwidth, low loss and anti-interference. At present, overhead optical cables are very mature and have been laid in large quantities. The load of the pole line is very heavy. For the old overhead lines, the suspension wire can no longer hang more optical cables, and the heavy load of the pole line requires the weight of the newly laid optical cables to be as light as possible. For some rural areas, how to effectively use the power pole line to lay the optical cable in the air is also a new direction that operators are actively exploring. Traditional overhead optical cables require suspension wires to be laid, and the optical cable has a large outer diameter and heavy weight, which cannot meet the current needs of operators. Operators need a non-metallic, self-supporting and lightweight optical cable.

[0003] Existing optical cable products mostly use metal composite tape as moisture barrier and auxiliary reinforcement. First, metal cannot be used for power poles. Second, metal structures are heavy (generally about 120kg / km), which increases the load on the poles and is relatively difficult to construct. Existing non-metallic optical cables use traditional FRP (Fiberglass-RainforcedPlastics, i.e. glass fiber reinforced composite plastic poles) as the central reinforcement. The loose tube layer is twisted and then sheathed with a polyethylene layer. It cannot be laid by itself. The general span is about 50 meters and the weight is also heavy, about 100kg / km.

[0004] Therefore, how to solve the deficiencies in the above-mentioned prior art has become a topic to be studied and solved in this application. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an aerial self-supporting lightweight optical cable.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An aerial self-supporting lightweight optical cable, comprising:

[0008] Cable core;

[0009] A reinforcement member, comprising an FRP rod and a herringbone reinforcement belt, wherein the FRP rod is arranged outside the cable core, and three herringbone reinforcement belts form a triangular structure and are covered outside the FRP rod;

[0010] The outer sheath covers the outside of the herringbone reinforcement belt.

[0011] Furthermore, the inscribed reinforcing belt is an inscribed glass fiber reinforced belt.

[0012] Furthermore, the FRP rods are provided at all three corners of the triangular structure formed by the triangular-shaped reinforcing tapes.

[0013] Furthermore, the outer diameter of the FRP rod is 0.6 mm.

[0014] Furthermore, the outer diameter of the triangular-shaped glass fiber reinforcing tape is 1.5 mm to 3 mm.

[0015] Furthermore, the cable core includes a loose tube, and optical fibers are provided inside the loose tube.

[0016] Furthermore, the loose tube is filled with a first water-blocking optical fiber filling material.

[0017] Furthermore, the cable core is filled with a second water-blocking optical fiber filling material.

[0018] Furthermore, the outer diameter of the loose tube is 2.0 mm, and the thickness is 0.25 mm.

[0019] Compared with the prior art, the advantages of the present invention are as follows: The FRP rods play a role in assisting tensile strength and filling the cable core structure. The triangular-shaped glass fiber reinforcing tape serves as the main tensile element, while supporting the cable structure and playing a moisture-proof role. The triangular-shaped reinforcement and triangular structure design can reduce the usage amount of glass fiber tapes, reduce the weight of the optical cable. The triangular structure can achieve a stable optical cable structure with the least number of tensile elements. This application can be self-supporting and aerial敷设 in cooperation with conventional fittings, and the laying span can be up to 200 m. The general laying span of conventional non-metallic self-supporting is about 100 m. At the same time, it has the advantages of light weight and small outer diameter. The weight is about 32% of that of conventional aerial cables, and the outer diameter is about 63% of that of conventional aerial cables, which can effectively reduce the pole load, be self-supporting and laid, and reduce the construction intensity. This application is a fully non-metallic design and can be laid using rural power poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Attached Figure 1 is a cross-sectional schematic diagram of an embodiment of the present application;

[0022] Attached Figure 2 is a cross-sectional schematic diagram of a guiding die of an embodiment of the present application;

[0023] Attached Figure 3This is a schematic diagram of the front view of the guide mold in the embodiment of the present application;

[0024] Attached Figure 4 This is a schematic diagram of a left side view of a discontinuous fiber paste filling device according to an embodiment of the present application;

[0025] Attached Figure 5 This is a cross-sectional schematic diagram of a discontinuous fiber paste filling device according to an embodiment of the present application;

[0026] Attached Figure 6 It is a schematic diagram of a right side view of the intermittent fiber paste filling device according to an embodiment of the present application.

[0027] Reference numerals and component descriptions in the drawings:

[0028] 1. Cable core; 11. Loose tube; 12. Optical fiber; 2. Reinforcement member; 21. FRP rod; 22. Pin-shaped reinforcement belt; 3. Outer sheath; 4. Guide mold; 5. First channel; 6. Second channel; 7. Third channel; 8. Inlet mold; 81. Three-hole nut; 82. Filling mold base; 83. Oil-filled cavity; 84. Oil-filled pipe; 85. Wire outlet hole; 86. Fixed shaft; 9. Guide mold sleeve; 91. Fiber tube; 92. Fiber inlet; 93. Intermittent air input pipe; 94. Fixed thread. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below through specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See attached Figure 1 As shown, the present application is an aerial self-supporting lightweight optical cable, comprising a cable core 1, a reinforcement member 2 and an outer sheath 3, the reinforcement member 2 comprising an FRP rod 21 and a T-shaped reinforcement belt 22, the FRP rod 21 is arranged outside the cable core 1, three T-shaped reinforcement belts 22 form a triangular structure and are coated on the outside of the FRP rod 21, and the outer sheath 3 is coated on the outside of the T-shaped reinforcement belt 22.

[0031] The following is a further explanation of the above structure:

[0032] The present application proposes a self-supporting lightweight optical cable for aerial installation, which can be installed in a self-supporting manner in aerial installation in combination with conventional hardware. The installation span can be as high as 200m, while the installation span of conventional non-metallic self-supporting cables is generally about 100m. It has the advantages of light weight and small outer diameter. The weight is about 32% of conventional aerial cables. The weight of the present application is about 32kg / km, and the corresponding number of cores of conventional aerial cables is about 100-120kg / km; the outer diameter is about 32% of conventional aerial cables. The outer diameter of the present application is about 6.3mm, and the corresponding number of cores of conventional aerial cables is about 10mm. It can effectively reduce the load on the pole line, self-support installation, and reduce construction intensity. The all-non-metal design can be used for installation on rural power pole lines.

[0033] Cable core 1 comprises loose tube 11, and optical fiber 12 is arranged inside loose tube 11, and optical fiber 12 and loose tube 11 are demand customization layers, and core number and color can be customized, and filling type or full dry type can be done. The typical outer diameter of general loose tube 11 is 2.0mm, and the wall thickness is 0.25mm. In order to fix optical fiber 12, the first water-blocking optical fiber filler is filled in loose tube 11, and the first water-blocking optical fiber filler can be water-blocking yarn or water-blocking tape, or adopts water-blocking powder with high expansion coefficient and small space accounting, and water-blocking powder is used as filling material, and water-blocking effect is good, pollution-free, while protecting the environment, it is also conducive to reducing the outer diameter of optical cable assembly, improving optical fiber 21 density, and reducing the weight of overhead optical cable.

[0034] The FRP rod 21 and the Chinese-shaped reinforcement belt 22 in the present application are used as force-bearing parts, which eliminates the need to install steel strands, and can be equipped with conventional hardware (such as pre-twisted wires, wedge-shaped clamps) for overhead self-supporting installation. Among them, the outer diameter of the FRP rod 21 is 0.6mm, and the Chinese-shaped reinforcement belt 22 adopts a Chinese-shaped glass fiber reinforcement belt, which is divided into a long belt outer diameter and a short belt outer diameter, the long belt outer diameter is 3mm, and the short belt outer diameter is 1.5mm. The long belts of the three Chinese-shaped reinforcement belts 22 form a triangular structure that covers the loose tube 11 and the FRP rod 21. The FRP rod 21 has three, which are respectively arranged at the three corners of the three Chinese-shaped reinforcement belts 22 that form the triangular structure. The outer sheath 3 covers the outside of the three Chinese-shaped reinforcement belts 22. The FRP rod 21 plays the role of auxiliary tensile resistance and filling the cable core structure. The Chinese-shaped glass fiber reinforcement belt serves as the main tensile element, while supporting the optical cable structure and playing a moisture-proof role. The triangular structure design and the inscribed reinforcing tape 22 can reduce the amount of glass fiber tape used and reduce the weight of the optical cable. The triangular structure can achieve a stable optical cable structure with the least tensile components. This results in a smaller outer diameter and weight, and enables lightweight self-supporting installation of the optical cable.

[0035] Among them, the outer sheath 3 is the outermost layer of the overhead optical cable. The outer sheath 3 is generally formed by extrusion. The material of the outer sheath 3 is selected from high-density polyethylene, medium-density polyethylene, linear low-density polyethylene, and electric tracking resistant polyolefin. In order to further improve the protection capability of the overhead optical cable, in a specific embodiment, a repellent layer is coated on the outside of the FRP rod 21. The repellent can be capsaicin, etc. In this way, when an animal approaches the overhead optical cable or chews the overhead optical cable, the smell or taste released by the repellent makes the animal feel uncomfortable, so that it stays away from the overhead optical cable, thereby preventing the animal from chewing the overhead optical cable, so the protection capability of the overhead optical cable can be further enhanced.

[0036] In another specific embodiment, a certain proportion of repellent is added to the material of the outer sheath 3. Similarly, the repellent can be selected from capsaicin and the like. In this way, when an animal approaches the overhead optical cable or chews the overhead optical cable, the smell or taste released by the repellent makes the animal feel uncomfortable, so that the animal stays away from the overhead optical cable, thereby preventing the animal from chewing the overhead optical cable, and thus the protective ability of the overhead optical cable can be further enhanced. In another specific embodiment, the color of the outer sheath 3 is a warning color. Warning colors include red, orange, and the like. When the outer sheath 3 is in a warning color such as red or orange, birds such as woodpeckers will be afraid of the overhead optical cable, thereby staying away from the overhead optical cable, thereby preventing birds from chewing the overhead optical cable, and thus the protective ability of the overhead optical cable can be further enhanced.

[0037] In a specific embodiment, a tear cord of polyester or other materials is provided under the outer sheath 3, so as to facilitate the peeling of the outer sheath. Of course, it is understandable that the tear cord may not be provided.

[0038] See attached Figure 2 and attached Figure 3 As shown, the main protection point of this application is the triangular structure of the "pink" reinforcement. In order to ensure that the triangular structure of the "pink"-shaped glass fiber reinforced belt and the FRP rod 21 outside the loose tube 11 are more stable during production and fix their own positions. During production, a guide mold 4 is added in front of the machine head, and the corresponding aperture of the guide mold 4 is about 0.2 to 0.3 mm larger than the material size. The inside of the guide mold 4 is provided with a first channel 5 corresponding to the cable core 1, a second channel 6 corresponding to the FRP rod 21, and a third channel 7 corresponding to the "pink"-shaped reinforcement belt 22, and the end of the guide mold 4 is provided with a thread for connecting the machine head.

[0039] In order to further reduce the weight of the optical cable, the weight of the casing is reduced by discontinuously filling the fiber jelly, thereby reducing the weight of the optical cable. Through experimental verification, when the length ratio of the fiber jelly to the bubble is 7:3, the water-blocking protection effect of the optical fiber jelly is not affected.

[0040] See the attached for the discontinuous filling fiber paste device. Figures 4 to 6As shown, according to the specification of loose tube 11, select the inlet mold 8 and guide mold sleeve 9 that match it. The inlet mold 8 is fixed on the filling mold seat 82 by three-hole nut 81, and the inlet mold 8 is a tapered structure, and the connection is sealed. The outlet of the inlet mold 8 enters the oil filling cavity 83, and the oil filling pipe 84 is located directly below the oil filling cavity 83, and is vertically perpendicular to the outlet direction of the inlet mold 8. The other side of the oil filling cavity 83 is a fiber outlet hole 85, and the outlet hole 85 mold is spirally fixed in the filling mold seat 82, and has detachability. Two symmetrical fixed shafts 86 realize the fixing of the guide mold sleeve 9 on the filling mold seat 82, and the outer side of the thinnest end of the guide mold sleeve 9 has a fixed thread 94 structure and a high temperature resistant gasket, which can be fixed in the extruder. The fiber tube 91 is embedded in the guide mold sleeve 9, and the fiber inlet 92 is a tapered structure. The outer side of the overall device reserves a slide rail groove, which can ensure that the filling device and the extruder head are inserted and pushed out in the same axial direction. The intermittent air input pipe 93 is connected to the fiber tube 91 through a threaded hole, and the nitrogen flow is controlled by an air pump to intermittently fill the fiber paste with bubbles (PLC is linked to the speed to ensure that the length ratio of the filled fiber paste to the bubbles is 7:3).

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-supporting lightweight optical cable for overhead use, characterized in that: include: Cable core; A reinforcement member, comprising an FRP rod and a herringbone reinforcement belt, wherein the FRP rod is arranged outside the cable core, and three herringbone reinforcement belts form a triangular structure and are covered outside the FRP rod; The outer sheath covers the outside of the herringbone reinforcement belt.

2. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The Chinese-shaped reinforcement belt is a Chinese-shaped glass fiber reinforcement belt.

3. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The FRP rods are arranged at the three corners of the triangular structure of the inscribed reinforcing belt.

4. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The outer diameter of the FRP rod is 0.6 mm.

5. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The outer diameter of the T-shaped glass fiber reinforced tape is 1.5 mm to 3 mm.

6. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The cable core comprises a loose tube, in which an optical fiber is arranged.

7. The aerial self-supporting lightweight optical cable according to claim 6, characterized in that: The loose tube is filled with a first water-blocking optical fiber filler.

8. The aerial self-supporting lightweight optical cable according to claim 1, characterized in that: The cable core is filled with a second water-blocking optical fiber filler.

9. The aerial self-supporting lightweight optical cable according to claim 6, characterized in that: The loose tube has an outer diameter of 2.0 mm and a thickness of 0.25 mm.

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