阅读说明：本技术 一种拖令光缆 (Festoon optical cable ) 是由 杨文良 周峰 叶志强 施耀文 毛庆生 余旭洋 费华青 董建来 孙丽华 马鹏飞 朱 于 2020-12-25 设计创作，主要内容包括：本发明属于通信光缆制造技术领域,尤其涉及一种拖令光缆。该拖令光缆包括交叉对称布置的光单元和辅助承力元件,所述光单元和所述辅助承力元件绞合形成缆芯,所述辅助承力元件包括松套管、填充在所述松套管内的纤维增强复合材料和纤膏,所述缆芯外纵包有芳纶丝。本发明提出的拖令光缆结构,可有效解决传统层绞式光缆反复弯曲性能不佳等问题,同时具有反复弯曲性能优异,重量轻,耐磨性、耐环境性能优良、阻燃等优点,具有良好的实用和使用价值。(The invention belongs to the technical field of communication optical cable manufacturing, and particularly relates to a festoon optical cable. The festoon optical cable comprises optical units and auxiliary bearing elements which are arranged in a crossed and symmetrical mode, wherein the optical units and the auxiliary bearing elements are twisted to form a cable core, the auxiliary bearing elements comprise a loose sleeve, a fiber reinforced composite material and fiber paste filled in the loose sleeve, and aramid fibers are longitudinally wrapped outside the cable core. The festoon optical cable structure provided by the invention can effectively solve the problems of poor repeated bending performance and the like of the traditional layer stranded optical cable, has the advantages of excellent repeated bending performance, light weight, excellent wear resistance, excellent environment resistance, flame retardance and the like, and has good practical and use values.)

1. The festoon optical cable is characterized by comprising optical units and auxiliary bearing elements which are arranged in a crossed and symmetrical mode, wherein the optical units and the auxiliary bearing elements are twisted to form a cable core, each auxiliary bearing element comprises a loose sleeve, a fiber reinforced composite material and fiber paste filled in the loose sleeve, and aramid fibers are longitudinally wrapped outside the cable core.

2. The festoon cable of claim 1, wherein the optical unit comprises a loose tube, an optical fiber filled in the loose tube, and a fiber paste.

3. A festoon cable according to claim 1 or 2, wherein the material of the loose tube is PP.

4. The festoon cable of claim 1 or 2, wherein the fiber paste is a low temperature fiber paste.

5. The festoon cable of claim 1, wherein the outer layer of aramid filaments is longitudinally wrapped with an inner jacket.

6. The festoon cable of claim 5, wherein the outer layer of the inner jacket is longitudinally wrapped with a tape.

7. The festoon cable of claim 6, wherein the tape is a fire resistant tape.

8. The festoon cable of claim 6 wherein the outer layer of said tape is longitudinally covered by an outer sheath.

9. The festoon cable of claim 8, wherein the outer jacket is a chlorinated polyethylene material.

10. The festoon optical cable of claim 1, wherein a tear cord is disposed at an interface where the cable core and the aramid filaments meet.

Technical Field

The invention belongs to the technical field of communication optical cable manufacturing, and particularly relates to a festoon optical cable.

Background

As the demand for information continues to increase, fiber optic communication is widely used as the fastest and best quality communication method. The towing system also starts to use optical fibers as a transmission mode, and the old towing cable adopts a copper cable, so that the cost is high, the weight is heavy, signals are volatile and true, and the anti-interference capability is poor. Compared with a copper cable, the optical cable is light in weight, low in cost, excellent in signal transmission quality and high in anti-interference capacity. However, the conventional stranded optical cable may be repeatedly bent for a long time, which may cause the central strength member to be damaged and the outer sheath to be cracked. It is difficult to provide a tensile force to the optical cable and satisfy the long-term repeated bending movement.

Disclosure of Invention

The invention aims to provide a festoon optical cable, which adopts a 0+ N optical cable structure, cancels a central reinforcement, utilizes aramid fiber yarns as a main bearing element, utilizes a fiber reinforced composite material filled loose tube as an auxiliary bearing element for providing the tensile force required by the optical cable, and not only can well solve the problem of the tensile force of the optical cable, but also can solve the problems of repeated bending, poor torsion performance and the like of the optical cable.

In order to achieve the purpose, the invention provides the following technical scheme:

the optical unit and the auxiliary bearing element are twisted to form a cable core, the auxiliary bearing element comprises a loose sleeve, and a fiber reinforced composite material and a fiber paste which are filled in the loose sleeve, and the cable core is longitudinally wrapped with aramid fibers.

Further, the optical unit includes a loose tube, an optical fiber filled in the loose tube, and a fiber paste.

Furthermore, the outer layer of the aramid fiber yarn is longitudinally wrapped with an inner sheath.

Furthermore, the outer layer of the inner sheath is longitudinally wrapped with wrapping belts which are fire-resistant wrapping belts.

Further, the outer layer of the wrapping tape is longitudinally wrapped with an outer sheath, and the outer sheath is made of chlorinated polyethylene.

Furthermore, a tearing rope is arranged on the interface where the cable core is connected with the aramid fiber.

Further, the material of the loose tube is PP.

Further, the fiber paste is low-temperature fiber paste.

The invention has the beneficial effects that:

(1) according to the invention, the aramid fiber wire is used as a main bearing element, and the aramid fiber wire longitudinally wrapped outside the cable core is uniformly stressed, so that the bending resistance of the optical cable is enhanced; the Fiber Reinforced Plastic (FRP) filled loose tube is used as an auxiliary bearing element and is twisted with the optical units in a crossed and symmetrical arrangement, and the FRP bears the tensile force without influencing the bending performance of the optical cable, thereby providing certain flexibility for the whole optical cable.

(2) The optical cable adopts a non-metal structure, has an obvious lightning protection effect, and has lower weight, excellent bending performance and excellent signal transmission performance compared with the traditional towing cable.

(3) The outer sheath is made of novel Chlorinated Polyethylene (CPE), the CPE is decomposed at the temperature of more than 170 ℃ to release hydrogen chloride, and the flexibility is still kept at the temperature of minus 30 ℃. The CPE outer sheath has excellent weather resistance, ozone resistance, chemical resistance and aging resistance, has good oil resistance and flame retardance, has the characteristics of combustion and dripping prevention, enables the optical cable to have high stretchability and toughness, has high-temperature deformation resistance and stress cracking resistance, and has certain flame retardance.

(4) The loose tube is made of PP (polypropylene) material, so that the loose tube has good bending resistance.

(5) The fire-resistant wrapping tape is selected as the material of the wrapping tape, so that the fire-retardant and fire-resistant performance of the optical cable can be improved.

(6) The fiber paste is low-temperature fiber paste, so that the optical cable is convenient to use in a low-temperature environment.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is a flow chart of a process for producing a festoon cable according to example 1.

Fig. 2 is a schematic structural diagram of the festoon cable in embodiment 1.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment provides a festoon optical cable for port machinery, a production process flow chart of the festoon optical cable is shown in fig. 1, and in the process flow, the excess length of an optical fiber is controlled: the FRP loose tube and the excess length control of the optical fiber loose tube are mainly researched from the aspect of an extrusion die, the FRP loose tube is easy to generate the phenomena of tube bulging and tube sticking in the production process, the excess length of optical fibers is not well controlled in the production process of the optical fiber loose tube, the proper extrusion die is customized to control the excess length of the optical fibers by researching the die stretching ratio and the stretching balance coefficient, and the proper stretching ratio determined by the method is 8-12 and the stretching balance coefficient is 1.01-1.09.

Referring to fig. 2, an optical fiber 1 and FRP2 are wrapped in a PP loose tube 3 through a one-time plastic sheathing process, the loose tube 3 is filled with low-temperature fiber paste 4, and is twisted into a compact and round cable core through SZ, a layer of polymer material (such as polyethylene) is extruded after aramid fiber filaments 5 are longitudinally wrapped outside the cable core to serve as an inner sheath 6, and a second layer of polymer material (such as chlorinated polyethylene) is extruded after wrapping tape 7 is longitudinally wrapped outside the inner sheath 6 to serve as an outer sheath 8. In addition, a tearing rope 9 is arranged on the interface where the cable core is connected with the aramid fiber 5.

In summary, the festoon optical cable provided by the invention is prepared by reasonable technical production process through reasonable optical cable structure and optical cable material selection and collocation, solves the problem that the traditional layer stranded optical cable is poor in repeated bending performance and torsion performance, and greatly prolongs the service life of the optical cable in a festoon system. The invention has simple structure, excellent bending property, good flexibility and wear resistance, no fear of dragging, convenient construction and convenient later maintenance.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.