Layer-stranded optical cable

Abstract

The invention relates to the technical field of optical cables, in particular to a layer-stranded optical cable which comprises optical fibers, a loose tube, a counterweight part, a sleeve and a sheath. A plurality of optical fibers are arranged; the plurality of optical fibers are arranged in the loose tube in a sleeving manner; the counterweight piece is sleeved in the sleeve in a sliding manner and is used for increasing the weight of the optical cable; the loose sleeve and the sleeve are arranged in the sheath in a sleeving manner; according to the invention, the gravity of the optical cable is changed by drawing out or drawing back the counterweight piece into the optical cable, so that the optical cable automatically floats or sinks, and the optical cable can float up only by simply drawing out the counterweight piece without the need of diving repair by constructors or fishing the optical cable above the water surface for joint repair by a special fishing workboat.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cables, and in particular to a stranded optical cable. Background Art

[0002] With the rapid development of the communications industry, the development of optical fiber cables is getting better and better, and there are more and more types. Optical cables are distributed in valleys, lakes, oceans, the sky, underground, etc. To install optical cables in lakes and oceans, the optical cables themselves need to have a large gravity so that they can naturally sink underwater. It is difficult to maintain the laid optical cables. In the existing technology, construction personnel are often required to perform diving repairs or use special salvage construction ships to salvage the optical cables above the water surface for joint repairs, and then sink the repaired optical cables underwater. The construction steps are cumbersome and labor-intensive because the optical cables themselves cannot float automatically.

[0003] At present, how to make the optical cable automatically float when maintenance is needed and automatically sink after maintenance is completed has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The present invention provides a layer-twisted optical cable, which can automatically float when the optical cable needs maintenance and automatically sink after the maintenance is completed.

[0005] The present invention provides a layer-stranded optical cable, comprising: Optical fiber; a plurality of optical fibers are provided; Loose tube; a plurality of optical fibers are sleeved inside the loose tube; Counterweight; The counterweight is slidably mounted inside the sleeve to increase the weight of the optical cable; The loose tube and the casing are both sleeved inside the sheath.

[0006] In some embodiments, a water-blocking material A is disposed inside the loose tube.

[0007] In some embodiments, a reinforcing member is provided inside the sheath, and the reinforcing member abuts against the loose tube and the sleeve respectively.

[0008] In some embodiments, the interior of the sheath is further provided with water-blocking material B and water-blocking material C, the water-blocking material B abuts against the reinforcement and the sleeve respectively, and the water-blocking material C abuts against the loose sleeve and the reinforcement respectively.

[0009] In some embodiments, a water-blocking material D is disposed inside the sleeve.

[0010] In some embodiments, a filler is disposed inside the sheath.

[0011] In some embodiments, the filler includes: filler A, filler B and filler C; the filler A abuts against the loose tube and the sheath respectively, the filler B abuts against the loose tube, the sleeve and the sheath respectively, and the filler C abuts against the sleeve and the sheath respectively.

[0012] In some embodiments, a reinforcement layer is disposed outside the sheath, and an outer coating layer is disposed outside the reinforcement layer.

[0013] In some embodiments, the loose tubes and sleeves are provided in two groups and are arranged circumferentially inside the sheath.

[0014] In some embodiments, the counterweight is a steel wire, a lead wire, or an insulated wire.

[0015] The beneficial effects of the present invention are as follows: a stranded optical cable of the present invention is located underwater during use. When maintenance is required, driving components are arranged at the parts of the optical cable at both ends located above the water for retracting and releasing the rope. At the same time, one end of the rope is tied to the counterweight, and the other end is connected to the output end of the driving component. Then the driving component on one side retracts the rope, and the driving component on the other side releases the rope to pull out the counterweight. At this time, the rope is located inside the optical cable, and the weight of the optical cable is greatly reduced, and its gravity is less than its buoyancy, so the optical cable will float on the water surface for easy maintenance. After the maintenance is completed, the two sets of driving components are reversed to pull the counterweight back into the optical cable. At this time, the gravity of the optical cable is greater than its buoyancy, and it will automatically sink. Then the entire maintenance work is completed by removing the rope. Compared with the prior art, the technical solution of the present invention does not require construction personnel to perform diving repairs or special salvage construction ships to salvage the optical cable above the water surface for joint repair. The optical cable can be floated by simply pulling out the counterweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of some specific embodiments of a layer-twisted optical cable of the present invention; In the accompanying drawings, 1, optical fiber; 2, water-blocking material A; 3, loose tube; 4, reinforcement; 5, water-blocking material B; 6, counterweight; 7, water-blocking material D; 8, tube; 9, filler; 91-filler A; 92-filler B; 93-filler C; 10-sheath; 11-reinforcement layer; 12-outer layer; 13-water-blocking material C. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0018] At present, optical cables are widely used. They can be installed in lakes and oceans. The laid optical cables are located underwater. The underwater working environment is poor and it is difficult to carry out subsequent maintenance. Construction personnel are often required to perform diving repairs or use a special salvage construction ship to salvage the optical cables above the water surface for joint repairs. In order to install the optical cables underwater, the optical cables themselves have a large gravity and cannot float automatically. Therefore, how to make the optical cables float automatically when they need maintenance and sink automatically after maintenance is completed has become a technical problem that needs to be solved urgently by technicians in this field.

[0019] To solve the above problems, refer to Figure 1 The present invention provides a layer-stranded optical cable, comprising an optical fiber 1; the optical fiber 1 is provided with a plurality of fibers; Loose tube 3; multiple optical fibers 1 are sleeved inside the loose tube 3; Counterweight 6; The counterweight 6 is slidably mounted inside the sleeve 8 to increase the weight of the optical cable; The sheath 10; the loose tube 3 and the casing 8 are both sleeved inside the sheath 10; Specifically, the optical fiber 1 is used to transmit data, and the loose tube 3 can protect the optical fiber 1. The optical fiber 1 is a UV-cured colored optical fiber, which enhances the recognition of the optical fiber 1. The material of the loose tube 3 is polybutylene terephthalate or modified polypropylene. The relative density of polybutylene terephthalate is 1.31-1.55, and the water absorption rate is low, only 0.07%. It has good toughness and fatigue resistance, high impact strength, self-lubrication and wear resistance, small friction coefficient, also has good dimensional stability, excellent electrical properties, good arc resistance, modified polypropylene has higher strength and hardness, possesses good wear resistance and impact resistance, also has good corrosion resistance, therefore no matter use above-mentioned which material can guarantee the service life of loose tube 3, the material of tube 8 is polyethylene or polypropylene, polyethylene has good low temperature resistance, the lowest use temperature can reach-100 ℃~-70 ℃, has higher strength and wear resistance, is suitable for making various parts and components, has very high corrosion resistance, can resist the erosion of chemical substances well, can adapt to various environments as the material used by optical cable, and has longer service life, the mechanical property of polypropylene is excellent, except impact resistance, other mechanical properties are all better than polyethylene. The material used by sheath 10 is low-density polyethylene or foamed plastic, low-density polyethylene has good flexibility, extensibility, cold resistance and chemical stability, and foamed plastic has excellent impact, vibration energy absorption.

[0020] Preferably, a water-blocking material A2 is provided inside the loose tube 3 .

[0021] Preferably, a reinforcing member 4 is sleeved inside the sheath 10, and the reinforcing member 4 abuts against the loose tube 3 and the sleeve 8 respectively; Specifically, the reinforcement 4 is used to bear part of the tension, and the material used is aramid reinforced plastic rod, which is mainly composed of aramid fiber and plastic matrix. Aramid fiber has excellent mechanical properties, so that the aramid reinforced plastic rod has high strength and modulus, and also has good lightweight characteristics. The interior of the optical cable is densely filled and not easy to deform.

[0022] Preferably, the sheath 10 is further provided with water-blocking material B5 and water-blocking material C13, the water-blocking material B5 abuts against the reinforcement member 4 and the sleeve 8 respectively, and the water-blocking material C13 abuts against the loose sleeve 3 and the reinforcement member 4 respectively.

[0023] Specifically, the reinforcement member 4 is located at the axial center position inside the sheath 10 .

[0024] Preferably, the interior of the sleeve 8 is provided with a water-blocking material D7; Specifically, water-blocking material A2, water-blocking material B5, water-blocking material C13 and water-blocking material D7 can prevent longitudinal water seepage. The materials used are water-blocking paste or water-blocking yarn. Water-blocking paste and water-blocking yarn are both active water-blocking materials with strong water absorption and high expansion rate. They can absorb water strongly and expand rapidly to block water penetration and protect the inside of the optical cable.

[0025] Preferably, a filler 9 is provided inside the sheath 10; Specifically, the filler 9 is lighter and can improve the buoyancy of the optical cable. The material used for the filler 9 is a foamed plastic rope. The foamed plastic rope is a rope made of plastic, and its main component is usually polypropylene. The foamed plastic rope has high strength and wear resistance, can withstand greater tension and weight, is not easily corroded by chemicals, and has good acid and alkali resistance.

[0026] Preferably, the filler 9 includes: filler A91, filler B92 and filler C93; the filler A91 abuts against the loose tube 3 and the sheath 10 respectively, the filler B92 abuts against the loose tube 3, the casing 8 and the sheath 10 respectively, and the filler C93 abuts against the casing 8 and the sheath 10 respectively.

[0027] Preferably, a reinforcement layer 11 is disposed outside the sheath 10, and an outer layer 12 is disposed outside the reinforcement layer 11; Specifically, the reinforcement layer 11 is flexible and can provide good mechanical properties. The sheath 10 and the outer layer 12 isolate the water vapor in the axial direction of the optical cable. The material used for the reinforcement layer 11 is high modulus aramid, which has excellent chemical resistance, acid and alkali resistance, and good dimensional stability. The outer layer 12 is high-density polyethylene, which has excellent chemical resistance, electrical insulation, low temperature resistance and anti-permeability, so that the cable completely avoids the problem of water seepage.

[0028] Preferably, two groups of the loose tubes 3 and the sleeves 8 are provided and are arranged circumferentially inside the sheath 10 .

[0029] Preferably, the counterweight 6 is a steel wire, a lead wire or an insulated wire; Specifically, when the counterweight 6 is provided with an insulated wire, it becomes a photoelectric hybrid cable.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A stranded optical cable, characterized in that: include: Optical fiber (1); a plurality of optical fibers (1) are provided; Loose tube (3); a plurality of optical fibers (1) are sleeved inside the loose tube (3); Counterweight (6); The counterweight (6) is slidably mounted inside the sleeve (8) to increase the weight of the optical cable; A sheath (10); the loose tube (3) and the sleeve (8) are both sleeved inside the sheath (10).

2. A stranded optical cable according to claim 1, characterized in that: The loose tube (3) is provided with a water-blocking material A (2) inside.

3. The stranded optical cable according to claim 1, characterized in that: A reinforcing member (4) is sleeved inside the sheath (10), and the reinforcing member (4) abuts against the loose tube (3) and the sleeve (8) respectively.

4. A stranded optical cable according to claim 3, characterized in that: The sheath (10) is also provided with a water-blocking material B (5) and a water-blocking material C (13) inside. The water-blocking material B (5) abuts against the reinforcing member (4) and the sleeve (8) respectively, and the water-blocking material C (13) abuts against the loose sleeve (3) and the reinforcing member (4) respectively.

5. The stranded optical cable according to claim 1, characterized in that: A water-blocking material D (7) is provided inside the sleeve (8).

6. The stranded optical cable according to claim 1, characterized in that: A filler (9) is arranged inside the sheath (10).

7. The layer-stranded optical cable according to claim 6, characterized in that: The filler (9) comprises a filler A (91), a filler B (92) and a filler C (93); the filler A (91) abuts against the loose tube (3) and the sheath (10) respectively, the filler B (92) abuts against the loose tube (3), the sheath (8) and the sheath (10) respectively, and the filler C (93) abuts against the sheath (8) and the sheath (10) respectively.

8. The stranded optical cable according to claim 1, characterized in that: A reinforcement layer (11) is arranged outside the sheath (10), and an outer coating layer (12) is arranged outside the reinforcement layer (11).

9. The stranded optical cable according to claim 1, characterized in that: The loose tubes (3) and sleeves (8) are each provided in two groups and are arranged circumferentially inside the sheath (10).

10. The stranded optical cable according to claim 1, characterized in that: The counterweight (6) is a steel wire, a lead wire or an insulated wire.

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