Self-supporting portable optical cable used for overhead

Abstract

The utility model discloses an overhead self-supporting light type optical cable, which comprises a cable core, a reinforcing member and an outer sheath, the reinforcing member 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 are coated outside the FRP rod, and the outer sheath is coated outside the delta-shaped reinforcing belts. According to the utility model, the FRP rods play a role in assisting 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 reinforcing member and the triangular structure can reduce the use amount of the glass fiber tape, reduce the weight of the optical cable and improve the tensile strength of the optical cable. The triangular structure can realize a stable optical cable structure with least tensile elements.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, and in particular to a lightweight, self-supporting optical cable for aerial applications. Background Technology

[0002] With the vigorous development of fiber optic communication, optical fiber, with its excellent performance such as high bandwidth, low loss, and anti-interference, has been widely used in various fields. Currently, aerial optical cables are mature and have been extensively laid. Pole lines bear heavy loads, and for older aerial lines, the suspension wires can no longer support more optical cables. Furthermore, the heavy load on pole lines necessitates that newly laid optical cables be as lightweight as possible. For some rural areas, effectively utilizing power poles for self-supporting aerial optical cable laying is a new direction that operators are actively exploring. Traditional aerial optical cables require suspension wires for laying, and their large outer diameter and heavy weight cannot meet the current needs of operators. Operators require a lightweight, self-supporting, all-non-metallic optical cable.

[0003] Existing optical cable products mostly use metal composite strips as moisture barriers and auxiliary reinforcement. Firstly, metal cannot be used for power poles, and secondly, metal structures are heavy (generally around 120 kg / km), increasing the load on the poles and making construction relatively difficult. Existing non-metallic optical cables use traditional FRP (Fiberglass-Rainforced Plastics) as the central reinforcement, with loose tubes and a polyethylene sheath. They cannot be self-supporting during installation, typically with a span of around 50 meters, and are also relatively heavy, weighing approximately 100 kg / km.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this application. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a lightweight, self-supporting optical cable for aerial applications.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A lightweight, self-supporting optical cable for aerial applications includes:

[0008] Cable core;

[0009] The reinforcing member includes an FRP rod and three triangular reinforcing strips. The FRP rod is disposed outside the cable core, and the three triangular reinforcing strips form a triangular structure and cover the FRP rod.

[0010] The outer sheath covers the outside of the triangular reinforcing strip.

[0011] Furthermore, the triangular reinforcing strip is a triangular glass fiber reinforcing strip.

[0012] Furthermore, the FRP rod is provided at each of the three corners of the triangular reinforcing strip that makes up the triangular structure.

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

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

[0015] Furthermore, the cable core includes a loose tube, and an optical fiber is disposed inside the loose tube.

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

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

[0018] Furthermore, the loose sleeve has an outer diameter of 2.0 mm and a thickness of 0.25 mm.

[0019] Compared with existing technologies, the advantages of this invention are as follows: FRP rods serve as auxiliary tensile supports and filler in the cable core structure; a triangular glass fiber reinforced tape acts as the main tensile element, simultaneously supporting the optical cable structure and providing moisture protection; the triangular reinforcement and triangular structure design reduces the amount of glass fiber tape used, thus reducing the weight of the optical cable; and the triangular structure achieves a stable optical cable structure with minimal tensile elements. This invention, when used with conventional fittings, allows for self-supporting aerial laying with a span of up to 200m, while conventional non-metallic self-supporting cables typically have a span of around 100m. It also boasts advantages such as light weight and small outer diameter, weighing approximately 32% and having an outer diameter of approximately 63% of conventional aerial cables, effectively reducing pole load, enabling self-supporting laying, and lowering construction intensity. This invention is an all-non-metallic design, enabling laying on rural power poles. Attached Figure Description

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Appendix Figure 1 This is a cross-sectional schematic diagram of an embodiment of this application;

[0022] Appendix Figure 2 This is a cross-sectional schematic diagram of the guide mold according to an embodiment of this application;

[0023] Appendix Figure 3 This is a schematic front view of the guide mold according to an embodiment of this application;

[0024] Appendix Figure 4 This is a schematic left view of the intermittent filling fiber paste device according to an embodiment of this application;

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

[0026] Appendix Figure 6 This is a right-side schematic diagram of the intermittent filling fiber paste device according to an embodiment of this application.

[0027] Explanation of reference numerals and components in the accompanying drawings:

[0028] 1. Cable core; 11. Loose tube; 12. Optical fiber; 2. Reinforcing member; 21. FRP rod; 22. Triangular reinforcing strip; 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 filling chamber; 84. Oil filling pipe; 85. Outlet hole; 86. Fixed shaft; 9. Guide mold sleeve; 91. Fiber optic tube; 92. Fiber optic inlet; 93. Intermittent air input pipe; 94. Fixed thread. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described through specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] See appendix Figure 1 As shown, this application discloses an aerial self-supporting lightweight optical cable, which includes a cable core 1, a reinforcing member 2, and an outer sheath 3. The reinforcing member 2 includes an FRP rod 21 and three triangular reinforcing strips 22. The FRP rod 21 is disposed outside the cable core 1, and the three triangular reinforcing strips 22 form a triangular structure and cover the FRP rod 21. The outer sheath 3 covers the triangular reinforcing strips 22.

[0031] The above structure will be further explained below:

[0032] This application proposes a lightweight, self-supporting optical cable for aerial installation. When used with conventional fittings, it can be laid self-supportingly in the air with a span of up to 200m, compared to approximately 100m for conventional non-metallic self-supporting cables. It features lightweight construction and a small outer diameter, weighing approximately 32% of conventional aerial cables (approximately 32 kg / km), compared to 100-120 kg / km for conventional aerial cables. Its outer diameter is also approximately 32% of conventional aerial cables (approximately 6.3 mm), compared to approximately 10 mm for conventional aerial cables. This effectively reduces pole load, facilitates self-supporting installation, and lowers construction intensity. Furthermore, its all-non-metallic design allows for installation on rural power poles.

[0033] Cable core 1 includes a loose tube 11, inside which an optical fiber 12 is installed. The optical fiber 12 and the loose tube 11 are custom-made layers, and the number of cores and color can be customized. It can be made as a filled type or a completely dry type. Generally, the outer diameter of the loose tube 11 is 2.0 mm and the wall thickness is 0.25 mm. In order to fix the optical fiber 12, the loose tube 11 is filled with a first water-blocking optical fiber filler. The first water-blocking optical fiber filler can be water-blocking yarn or water-blocking tape, or water-blocking powder with a high expansion coefficient and small space occupation. Water-blocking powder as a filler material has good water blocking effect and no pollution. While protecting the environment, it also helps to reduce the outer diameter of the optical cable assembly, increase the density of optical fiber 21, and reduce the weight of the overhead optical cable.

[0034] In this application, the FRP pole 21 and the triangular reinforcing strip 22 serve as load-bearing components, eliminating the need for steel strand installation and allowing for self-supporting overhead installation with conventional hardware (such as pre-twisted wire and wedge clamps). The FRP pole 21 has an outer diameter of 0.6 mm, while the triangular reinforcing strip 22 is made of triangular-shaped glass fiber reinforcement. The triangular reinforcing strip 22 has a long outer diameter of 3 mm and a short outer diameter of 1.5 mm. The long strips of the three triangular reinforcing strips 22 form a triangular structure that covers the loose tube 11 and the FRP pole 21. There are three FRP poles 21, each positioned at one of the three corners of the triangular structure. The outer sheath 3 covers the three triangular reinforcing strips 22. The FRP pole 21 assists in tensile strength and fills the cable core structure, while the triangular glass fiber reinforcement strip serves as the main tensile element, supporting the optical cable structure and providing moisture protection. The triangular reinforcement strip 22 and the triangular structure design reduce the amount of fiberglass tape used, thus lightening the weight of the optical cable. The triangular structure allows for a stable optical cable structure with minimal tensile elements. This results in a smaller outer diameter and weight, enabling lightweight, self-supporting installation of the optical cable.

[0035] Among them, the outer sheath 3 is the outermost layer of the aerial 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, tracking-resistant polyolefin, etc. In a specific embodiment, in order to further improve the protection ability of the aerial optical cable, a repellent layer is coated on the FRP rod 21. The repellent can be capsaicin, etc. In this way, when an animal approaches the aerial optical cable or bites the aerial optical cable, the smell or taste released by the repellent makes the animal feel uncomfortable, so that it stays away from the aerial optical cable, thereby preventing the animal from biting the aerial optical cable, and thus the protection ability of the aerial 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 as capsaicin, etc. In this way, when an animal approaches the aerial optical cable or bites the aerial optical cable, the smell or taste released by the repellent makes the animal feel uncomfortable, so that it stays away from the aerial optical cable, thereby preventing the animal from biting the aerial optical cable, and thus the protection ability of the aerial optical cable can be further enhanced. In yet another specific embodiment, the color of the outer sheath 3 is a warning color. The warning colors include red, orange, etc. When the outer sheath 3 is in warning colors such as red and orange, birds such as woodpeckers will have a fear psychology when seeing the aerial optical cable, so that they stay away from the aerial optical cable, thereby preventing the birds from biting the aerial optical cable, and thus the protection ability of the aerial optical cable can be further enhanced.

[0037] In a specific embodiment, a tearing rope made of polyester or other materials is arranged under the outer sheath 3, which facilitates the stripping of the outer sheath. Of course, it can be understood that the tearing rope can also not be provided.

[0038] See attached Figure 2 and attached Figure 3 As shown, the main protection point of this application is the "pin" shaped strengthening member triangular structure method. To ensure the triangular structure of the pin-shaped glass fiber reinforced tape and the FRP rod 21 outside the loose tube 11 are more stable during wire laying in production and at the same time fix their own positions. A guiding die 4 is added in front of the head during production. The corresponding aperture of the guiding die 4 is about 0.2 - 0.3 mm larger than the material size. 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 pin-shaped strengthening tape 22 are opened inside the guiding die 4, and a thread for connecting the head is provided at the end of the guiding die 4.

[0039] To further reduce the weight of the optical cable, by the form of intermittent filling of fiber paste, the weight of the sleeve part is reduced to achieve the purpose of reducing the weight of the optical cable. Through experimental verification, when the length ratio of the filled fiber paste to the bubbles is 7:3, the water-blocking and protection effect of the optical fiber fiber paste is not affected.

[0040] The device for intermittent filling of fiber paste is shown in attached Figures 4-6As shown, according to the specifications of the loose sleeve 11, a matching inlet mold 8 and guide mold sleeve 9 are selected. The inlet mold 8 is fixed to the filling mold base 82 by a three-hole nut 81. The inlet mold 8 has a conical structure and the connection is sealed. The outlet of the inlet mold 8 enters the oil filling chamber 83. The oil filling pipe 84 is located directly below the oil filling chamber 83 and is vertically perpendicular to the outlet direction of the inlet mold 8. On the other side of the oil filling chamber 83 is a fiber outlet hole 85. The fiber outlet hole 85 mold is screwed and fixed in the filling mold base 82, and is detachable. Two symmetrical fixed shafts 86 fix the guide mold sleeve 9 on the filling mold base 82. The outer surface of the thinnest end of the guide mold sleeve 9 has a fixing thread 94 structure and a high-temperature resistant washer, which can achieve fixation in the extruder. The fiber tube 91 is embedded in the guide mold sleeve 9, and the fiber inlet 92 has a conical structure. The outer side of the overall device has a reserved slide rail groove to ensure that the filling device and the extruder head can be inserted and ejected in the same axis. Intermittent air input pipe 93 is connected to fiber tube 91 through a threaded hole. The flow rate of nitrogen is controlled by an air pump to intermittently fill air bubbles with fiber paste (PLC is linked with speed to ensure that the length ratio of the filled fiber paste to the air bubble is 7:3).

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily 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 is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lightweight, self-supporting optical cable for aerial applications, characterized in that, include: Cable core; The reinforcing member includes an FRP rod and three triangular reinforcing strips. The FRP rod is disposed outside the cable core, and the three triangular reinforcing strips form a triangular structure and cover the FRP rod. The outer sheath covers the outside of the triangular reinforcing strip.

2. The lightweight, self-supporting optical cable for aerial applications according to claim 1, characterized in that, The triangular reinforcing strip is a triangular glass fiber reinforcing strip.

3. The lightweight, self-supporting optical cable for aerial applications according to claim 1, characterized in that, The FRP rod is provided at each of the three corners of the triangular reinforcing strip that makes up the triangular structure.

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

5. A lightweight, self-supporting optical cable for aerial applications according to claim 1, characterized in that, The outer diameter of the triangular reinforcing strip is 1.5mm to 3mm.

6. A lightweight, self-supporting optical cable for aerial applications according to claim 1, characterized in that, The cable core includes a loose tube, and an optical fiber is installed inside the loose tube.

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

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

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

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