CN115793166A - Air-blowing micro cable - Google Patents

Abstract

The invention discloses an air-blowing micro cable which comprises a central reinforcement, optical fiber units, a water-blocking layer, a heat-insulating layer and an outer sheath, wherein the central reinforcement, the optical fiber units, the water-blocking layer, the heat-insulating layer and the outer sheath are sequentially arranged from inside to outside; a fluorescent color strip is embedded in the outer sheath. In the air-blowing micro cable, when in use, in the laying of various air-blowing micro cables, part of the air-blowing micro cable can have the fluorescent color strips, and after the fluorescent color strips are arranged, the fluorescent color strips have the characteristic of being recognizable at night, and the fluorescent performance of the fluorescent color strips is good, so that the optical cable is convenient to maintain. And because the cable is embedded into the outer sheath, the diameter of the outer sheath cannot be interfered, and the diameter of the outer sheath cannot be too large. In conclusion, the air-blowing micro cable can effectively solve the problem that the air-blowing micro cable cannot be better identified in a dark environment.

Description

Air-blowing micro cable

Technical Field

The invention relates to the technical field of cables, in particular to an air-blowing micro cable.

Background

With the development of urbanization and mobile communication technology, the laying pipeline resources of the optical cable are increasingly tense, and even a crowded phenomenon occurs. Compared with the traditional optical cable, the air-blowing micro-cable has the advantages of obvious laying in the pipeline, greatly improved utilization rate of the existing pipeline resources, and reduction or avoidance of excavation of new communication pipelines, thereby reducing the overall cost of engineering.

For example, the chinese patent with application number 202111527876.8 discloses a low shrinkage central tube type air-blown micro cable, which has an optical transmission unit layer, a loose jacket layer and an outer protective layer; the optical transmission unit layer is provided with one or more optical fibers; the loose sleeve layer is arranged on the outer surface of the optical transmission unit layer; the outer protective layer is coated on the outer surface of the loose sleeve layer. The loose layer of the micro cable is made of special materials and is designed by a process, so that the shrinkage rate of the micro cable is extremely low in a high-cold environment, and the technical problem that the optical cable is not low-temperature resistant is solved.

However, when the communication pipe is maintained, the blown micro cable is required to have certain identification, and it is difficult to find the blown micro cable in a dark environment.

In summary, how to effectively solve the problem that the air-blowing micro cable cannot be identified better in a dark environment is a problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of this, an object of the present invention is to provide an air-blown micro cable, which can effectively solve the problem that the air-blown micro cable cannot be recognized well in a dark environment.

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

an air-blowing micro cable comprises a central reinforcement, optical fiber units, a water blocking layer, a heat insulation layer and an outer sheath which are sequentially arranged from inside to outside, wherein the optical fiber units are positioned between the central reinforcement and the water blocking layer and are arranged around the central reinforcement; a fluorescent color strip is embedded in the outer sheath.

In the air-blowing micro cable, when in use, in the laying of various air-blowing micro cables, part of the air-blowing micro cable can have the fluorescent color strips, and after the fluorescent color strips are arranged, the fluorescent color strips have the characteristic of being recognizable at night, and the fluorescent performance of the fluorescent color strips is good, so that the optical cable is convenient to maintain. And because the cable is embedded into the outer sheath, the diameter of the outer sheath cannot be interfered, and the diameter of the outer sheath cannot be too large. In conclusion, the air-blowing micro cable can effectively solve the problem that the air-blowing micro cable cannot be better identified in a dark environment.

Preferably, the fluorescent color bar and the outer sheath body are co-extruded outside the heat insulation layer.

Preferably, the outer sheath body is a black flame-retardant polyolefin body, and the fluorescent color strip comprises a fluorescent agent, a flame-retardant polyolefin material, a heat stabilizer and an antioxidant.

Preferably, the optical fiber unit includes an optical fiber and a loose tube, and the material of the loose tube includes a thermoplastic polyester elastomer and polybutylene terephthalate.

Preferably, the mass percentage of the thermoplastic polyester elastomer in the loose tube is 3-5%, and the mass percentage of the polybutylene terephthalate in the loose tube is 95-97%.

Preferably, the outside of the central strength member is provided with a cushion layer, the optical fiber unit is positioned outside the cushion layer, and the cushion layer is a high-density polyethylene layer extruded outside the central strength member.

Preferably, the heat insulation layer comprises a mica tape, and the heat insulation layer longitudinally wraps the outer side of the water-resistant layer and is connected with the mica tape by glue melting at the arrangement points of the gaps in the longitudinal direction.

Preferably, the optical fiber has an outer diameter of 200 microns.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an air-blowing micro cable according to an embodiment of the present invention.

The drawings are numbered as follows:

1-an optical fiber; 2-ointment; 3-loosening the sleeve; 4-cushion coat; 5-a central reinforcement; 6-a water resistant layer; 7-a heat insulation layer; 8-an outer sheath; 9-fluorescent color bar.

Detailed Description

The embodiment of the invention discloses an air-blowing micro cable which can effectively solve the problem that the air-blowing micro cable cannot be better identified in a dark environment.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an air-blown micro cable according to an embodiment of the present invention.

In some embodiments, the present embodiment provides an air-blown micro-cable, which may be an optical cable, and specifically, the air-blown micro-cable includes a central strength member 5, an optical fiber unit, a water-resistant layer 6, an insulation layer 7, and an outer sheath 8, which are sequentially disposed from inside to outside.

Wherein the central reinforcing member 5 is positioned at the central position of the air-blowing micro cable, and the central reinforcing effect is achieved. Wherein central reinforcement 5 preferably adopts non-metallic material, and non-metallic material generally adopts waterproofing type glass fiber reinforcement stick (FRP), can have water blocking performance and tensile resistance.

A plurality of said optical fibre units are located between the central strength member 5 and the water-resistant layer 6 and arranged around said central strength member 5, although a plurality of optical fibre units may also be mixed with a filler rope to surround the central strength member 5 together with the optical fibre units. Specifically, a plurality of optical fiber units and the filling rope can be wound outside the central reinforcing member 5 in an SZ stranding manner.

The water-proof layer 6 is a water-proof yarn layer, and preferably a water-proof binding yarn. So that the plurality of optical fiber units and the filling cord are bundled after being wound around the center reinforcing member 5. The water-blocking tying yarn can fix the cable core, achieve the water-blocking effect and does not pollute the environment.

And wherein thermal-protective layer 7 can include the mica tape, indulges the package outside the cable core, indulges the package in the outside of water-blocking layer 6 promptly, plays the effect of isolated outside high temperature invasion and attack, can ensure that the air-blowing micro cable can normally transmit the signal under high temperature environment.

Wherein the embedding of oversheath 8 is provided with fluorescence colour bar 9 to under the dark surrounds, fluorescence colour bar 9 can outwards send fluorescence, and because the embedding is in oversheath 8, can not interfere oversheath 8 diameter size, avoids oversheath 8 diameter can not too big. The fluorescent color stripe 9 may or may not be exposed a little bit, but the part attached to it should be thin enough or transparent to make the fluorescence of the fluorescent color stripe 9 emit outward to ensure that the outside can observe the fluorescence by human eyes.

In the air-blowing micro cable, when in use, in the laying of various air-blowing micro cables, part of the air-blowing micro cable can have the fluorescent color strips 9, and after the fluorescent color strips 9 are arranged, the fluorescent color strips 9 can be identified at night, and the fluorescent color strips 9 have good fluorescent performance, so that the optical cable is convenient to maintain. And because the outer sheath 8 is embedded, the diameter of the outer sheath 8 cannot be interfered, and the diameter of the outer sheath 8 cannot be too large. In conclusion, the air-blowing micro cable can effectively solve the problem that the air-blowing micro cable cannot be better identified in a dark environment.

In some embodiments, the fluorescent color strip 9 and the outer jacket body thereof may be co-extruded outside the insulating layer 7. Specifically, a double-sheath thin-wall extrusion technology can be adopted to realize the co-extrusion of the sheath body and the fluorescent color bar 9.

In some embodiments, the fluorescent color strip 9 may be formed first, and then the outer sheath body is extruded outside the fluorescent color strip 9 and the heat insulation layer 7, but such forming may result in poor bonding between the fluorescent color strip 9 and the outer sheath body, and may cause bending during bending, resulting in a decrease in strength of the outer sheath body.

In some embodiments, the outer sheath body is a black flame-retardant polyolefin body, and the fluorescent color strip 9 includes a fluorescent agent, a flame-retardant polyolefin material, a heat stabilizer, and an antioxidant. The fluorescent color bar 9 and the outer sheath body can be better combined, so that the fluorescent color bar 9 can be better formed into one part of the outer sheath body, and the strength of the outer sheath body is ensured. In particular, the width of the fluorescent color stripe 9 may be between 2mm and 3mm (millimeters).

In some embodiments, the optical fiber unit may include an optical fiber 1 and a loose tube 3, and the loose tube 3 may be made of polybutylene terephthalate (PBT) material only, but has poor bending resistance. Specifically, the material of the loose tube 3 may include a thermoplastic polyester elastomer and polybutylene terephthalate. Specifically, the mass percentage of the thermoplastic polyester elastomer in the loose tube 3 can be 3-5%, and the mass percentage of the polybutylene terephthalate in the loose tube 3 can be 95-97%. Specifically, the outer diameter of the loose tube 3 may be preferably set to a size of 1.2mm to 1.3mm (millimeter), and the loose tube 3 contains 6 to 12 optical fibers 1 and a thixotropic ointment 2 filled therein.

In some embodiments, for better protection of the optical fiber units, the outside of the central strength member 5 may be provided with a cushion layer 4, the optical fiber units are located outside the cushion layer 4, and the cushion layer 4 is a high density polyethylene layer extruded outside the central strength member 5.

In some embodiments, the outer diameter of the optical fiber 1 can be reduced from 245 μm to 200 μm, and the outer diameter of the coating layer of the optical fiber 1 can be reduced while maintaining the size of the bare fiber 1. Meanwhile, the optical cable is an all-dielectric optical cable, is light in weight per unit length and is particularly suitable for an air-blowing laying mode.

According to one aspect of the invention, an easily identifiable air-blown micro cable is provided, which comprises four production processes of coloring, plastic sheathing, cabling and sheath sheathing, and the specific use steps of the easily identifiable air-blown micro cable comprise:

the coloring process comprises the steps of paying off the optical fiber 1, threading the optical fiber, coating resin, curing by a UV-LED (ultraviolet-light emitting diode), taking up the optical fiber 1 and the like, and the acrylic resin is coated outside the bare optical fiber 1 to achieve the purpose of distinguishing the color of the optical fiber 1, wherein the plastic sheathing process comprises the steps of paying off the optical fiber 1, threading the optical fiber, extruding a sleeve, cooling and forming and the like, and the parameters of paying off tension of the optical fiber 1, temperature of a cooling water tank, number of main traction turns and the like need to be adjusted to meet the requirement of the residual length of the optical fiber 1. The processing temperature range of the TPEE material has influence on the after-shrinkage of the loose tube 3, and when the temperature is too low, the surface of the sleeve with poor plasticization can be caked; when the temperature is too high, the sleeve is not sufficiently crystallized, so that severe post-shrinkage is easy to occur, and the change of the extra length of the optical fiber 1 cannot be controlled. Through the adjustment of technological parameters, the extrusion molding temperature of the TPEE is controlled between 190 and 240 ℃, and the residual length of the loose tube 3 plastic sleeving machine is controlled between 0 per mill and 0.4 per mill.

The cabling process comprises the steps of paying off of the central reinforcing piece 5, paying off of the loose tube 3, paying off of the filling rope, SZ stranding, water blocking yarn binding, winding up of the tractor and the like, and finally the cable core of the air-blowing micro cable is formed.

The sheath process comprises the steps of cable core paying off, longitudinal wrapping of the heat insulation layer 7, extrusion of the outer sheath 8 and the like; the cable core pay-off device adopts active pay-off, the pay-off tension is stable, and the cable core jitter is small; hot melt adhesive is longitudinally wrapped outside the cable core at the edge of the heat insulation layer 7 at the point of 100-300 mm interval. When the sheath plastic extruding machine extrudes, the sheath material can be tightly wrapped on the heat insulation layer 7, and the condition that the sheath material falls off is reduced. When the sheath material is extruded, the double-sheath thin-wall extrusion technology is adopted to realize the co-extrusion of the sheath body and the fluorescent color bars 9, and the formed sheath has the thickness of 3-4 mm and the width of the color bars of 2-3 mm.

In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person 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 generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended 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 (8)

1. The air-blowing micro cable is characterized by comprising a central reinforcing member, optical fiber units, a water blocking layer, a heat insulation layer and an outer sheath which are sequentially arranged from inside to outside, wherein the optical fiber units are positioned between the central reinforcing member and the water blocking layer and are arranged around the central reinforcing member; a fluorescent color strip is embedded in the outer sheath.

2. The air-blown micro-cable of claim 1, wherein the fluorescent color bars and the outer jacket body are co-extruded outside of the insulation layer.

3. The air-blowing micro-cable of claim 2, wherein the outer sheath body is a black flame-retardant polyolefin body, and the fluorescent color strips comprise a fluorescent agent, a flame-retardant polyolefin material, a heat stabilizer and an antioxidant.

4. The air-blown micro-cable of any one of claims 1 to 3, wherein the optical fiber unit comprises an optical fiber and a loose tube, and the material of the loose tube comprises thermoplastic polyester elastomer and polybutylene terephthalate.

5. The air-blown micro-cable of claim 4, wherein the mass percentage of the thermoplastic polyester elastomer in the loose tube is 3-5%, and the mass percentage of the polybutylene terephthalate in the loose tube is 95-97%.

6. The air-blown micro-cable of claim 5, wherein the outside of the central strength member has a cushion layer, the optical fiber units are located outside the cushion layer, and the cushion layer is a high density polyethylene layer extruded outside the central strength member.

7. The air-blowing micro-cable of claim 6, wherein the thermal insulation layer comprises a mica tape, and the longitudinal thermal insulation layer is coated outside the water resistant layer and is melted with glue at a set point of a gap in the longitudinal direction to connect the mica tape.

8. The air-blown micro-cable of claim 7, wherein the optical fibers have an outer diameter of 200 microns.

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