CN111007604A - Flame-retardant composite optical cable - Google Patents
Flame-retardant composite optical cable Download PDFInfo
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- CN111007604A CN111007604A CN201911211480.5A CN201911211480A CN111007604A CN 111007604 A CN111007604 A CN 111007604A CN 201911211480 A CN201911211480 A CN 201911211480A CN 111007604 A CN111007604 A CN 111007604A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4436—Heat resistant
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
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Abstract
The invention discloses a flame-retardant composite optical cable which comprises a cable core and an outer sheath, wherein the cable core comprises optical fiber assemblies and loose tubes, the optical fiber assemblies are provided with a plurality of groups, the loose tubes are sleeved outside the optical fiber assemblies, fiber paste is filled between the loose tubes and the optical fiber assemblies, a fire-resistant layer assembly is arranged outside the cable core and comprises a first fire-resistant layer, a second fire-resistant layer and a third fire-resistant layer, the first fire-resistant layer is annularly arranged outside the loose tubes, an armor layer is arranged outside the first fire-resistant layer, and the armor layer is arranged on the outer wall of the first fire-resistant layer in a surrounding mode. According to the invention, the mica tape is used for wrapping the cable core to serve as the first fire-resistant layer, so that the optical cable can be effectively prevented from cracking, an insulating effect can be achieved, the manufacturing cost is low, the effect is achieved at one stroke, both the second fire-resistant layer and the third fire-resistant layer adopt the CNTS reinforced silicon nitride ceramic layer as the fire-resistant layer, the mechanical property of the optical cable can be improved on the basis of improving the high-temperature resistance, the structure is simple, and the use is convenient.
Description
Technical Field
The invention relates to the technical field of optical cables, in particular to a flame-retardant composite optical cable.
Background
The optical cable is characterized in that a cable core is formed by a certain number of optical fibers according to a certain mode, a sheath is wrapped outside the optical cable, and an outer protective layer is wrapped outside the optical cable and used for realizing optical signal transmission. It is commonly used in the field of communications, but also in other high-tech fields such as sensing, measurement, control, data acquisition, etc., such as mining industry, aerospace industry, military, oil and gas, and high temperature medical applications. These areas may involve special application environments, such as high temperature environments.
When the optical cable is used in an outdoor environment, the service life of the optical cable is generally not more than 5 years, and in places such as mountainous areas or urban densely populated areas, the optical cable is high in replacement and maintenance cost, once the outer sheath of the optical cable is aged and cracked, the optical cable cannot be processed in time, and the processing cost is high; and the outdoor optical cable has the risk of fire after high temperature or lightning stroke, and the traditional optical cable only depends on the polyvinyl chloride plastic on the outer layer to resist fire and flame, so the effect is not ideal enough, and a large amount of toxic gas can be generated after combustion, which is harmful to the environment and the human health and needs to be improved.
Disclosure of Invention
The invention aims to provide a flame-retardant composite optical cable, which aims to solve the problems that the existing optical cable in the background art is too simple in structure, flame-retardant and flame-retardant only by virtue of outer polyvinyl chloride plastic, the effect is not ideal enough, and a large amount of toxic gas is generated after combustion, so that the environment and the human health are harmed.
In order to achieve the purpose, the invention provides the following technical scheme: a flame-retardant composite optical cable comprises a cable core and an outer sheath, wherein the cable core comprises an optical fiber component and a loose tube, the optical fiber assembly is provided with a plurality of groups, the loose tube is sleeved outside the optical fiber assembly, fiber paste is filled between the loose tube and the optical fiber assembly, a fire-resistant layer assembly is arranged outside the cable core and comprises a first fire-resistant layer, a second fire-resistant layer and a third fire-resistant layer, the first fire-resistant layer is annularly arranged outside the loose tube, an armor layer is arranged outside the first fire-resistant layer, the armor layer is arranged on the outer wall of the first fire-resistant layer in a surrounding mode, a parallel steel wire reinforcing member is arranged between the outer sheath and the armor layer, the second fire-resistant layer is located between the parallel steel wire reinforcing member and the armor layer, the parallel steel wire reinforcing member is fixedly connected with the armor layer through the second fire-resistant layer, and the third fire-resistant layer is located between the outer sheath and the parallel steel wire reinforcing member.
Preferably, the first fire-resistant layer is a mica tape, and the first fire-resistant layer is wound on the outer wall of the loose tube through the mica tape.
Preferably, both the second refractory layer and the third refractory layer are made of CNTS silicon nitride ceramic.
Preferably, the outer sheath is a low-smoke halogen-free flame-retardant polyolefin outer sheath, and the thickness of the outer sheath is 0.5-2 mm.
Preferably, the loose tube is a PBT loose tube, and the thickness of the loose tube is 0.1-0.3 mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
Preferably, the mica tape has a thickness of 0.1-0.2mm.
Preferably, the thickness of the first layer of CNTS silicon nitride ceramic is 0.3-0.5 mm.
Preferably, the thickness of the second layer of CNTS silicon nitride ceramic is 0.4-0.6 mm.
The invention provides a flame-retardant composite optical cable which has the following beneficial effects:
(1) according to the invention, the mica tape is used for wrapping the cable core to serve as the first fire-resistant layer, so that the optical cable can be effectively prevented from cracking, an insulating effect can be achieved, the manufacturing cost is low, the effect is achieved at one stroke, both the second fire-resistant layer and the third fire-resistant layer adopt the CNTS reinforced silicon nitride ceramic layer as the fire-resistant layer, the CNTS reinforced silicon nitride ceramic layer has good high-temperature resistance, the toughening effect can be achieved, the mechanical property of the optical cable can be improved on the basis of improving the high-temperature resistance, the structure is simple, the use is convenient, and the overall fire resistance of the optical cable can be improved by adding three layers of fire-resistant layers on the basis of the conventional Chinese-style tubular optical cable structure.
(2) According to the invention, the fiber paste is filled between the loose tube and the optical fiber assembly, so that the tightness between the optical fiber assemblies can be ensured, the armor layer can be used for protecting the outside of the cable core by arranging the armor layer, the strength of the cable core is increased, meanwhile, the parallel steel wire reinforcing member can further protect the cable core, the compression resistance of the cable core is increased, the cable core is prevented from being damaged due to external force, and the service life of the cable core is prolonged.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
figure 2 is a schematic diagram of the cable core structure of the present invention.
In the figure: 100. a cable core; 101. an optical fiber assembly; 102. fiber paste; 103. loosening the sleeve; 200. a refractory layer; 201. a first refractory layer; 202. a second refractory layer; 203. a third refractory layer; 300. an armor layer; 400. an outer sheath; 500. parallel steel wire reinforcement members.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1:
as shown in fig. 1-2, the present invention provides a technical solution: a flame-retardant composite optical cable comprises a cable core 100 and an outer sheath 400, wherein the cable core 100 comprises optical fiber assemblies 101 and loose tubes 103, the optical fiber assemblies 101 are provided with a plurality of groups, the loose tubes 103 are sleeved outside the optical fiber assemblies 101, fiber paste 102 is filled between the loose tubes 103 and the optical fiber assemblies 101, a fire-resistant layer assembly 200 is arranged outside the cable core 100, the fire-resistant layer assembly 200 comprises a first fire-resistant layer 201, a second fire-resistant layer 202 and a third fire-resistant layer 203, the first fire-resistant layer 201 is annularly arranged outside the loose tubes 103, an armor layer 300 is arranged outside the first fire-resistant layer 201, the armor layer 300 is annularly arranged on the outer wall of the first fire-resistant layer 201, parallel steel wire reinforcing members 500 are arranged between the outer sheath 400 and the armor layer 300, the second fire-resistant layer 202 is positioned between the parallel steel wire reinforcing members 500 and the armor layer 300, the parallel steel wire reinforcing members 500 are fixedly connected with the armor layer 300 through the second, the third refractory layer 203 is located between the outer jacket 400 and the parallel wire reinforcement member 500.
The first fire-resistant layer 201 is a mica tape, and the first fire-resistant layer 201 is wound on the outer wall of the loose tube 103 through the mica tape.
The second refractory layer 202 and the third refractory layer 203 both adopt CNTS silicon nitride ceramics.
The outer sheath 400 is a low-smoke halogen-free flame-retardant polyolefin outer sheath, and the thickness of the outer sheath 400 is 0.5 mm.
The loose tube 103 is a PBT loose tube, and the thickness of the loose tube 103 is 0.1mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
The thickness of the mica tape is 0.1mm.
The thickness of the first layer of the CNTS silicon nitride ceramic is 0.3 mm.
The thickness of the second layer of CNTS silicon nitride ceramic is 0.4 mm.
Example 2:
as shown in fig. 1-2, the present invention provides a technical solution: a flame-retardant composite optical cable comprises a cable core 100 and an outer sheath 400, wherein the cable core 100 comprises optical fiber assemblies 101 and loose tubes 103, the optical fiber assemblies 101 are provided with a plurality of groups, the loose tubes 103 are sleeved outside the optical fiber assemblies 101, fiber paste 102 is filled between the loose tubes 103 and the optical fiber assemblies 101, a fire-resistant layer assembly 200 is arranged outside the cable core 100, the fire-resistant layer assembly 200 comprises a first fire-resistant layer 201, a second fire-resistant layer 202 and a third fire-resistant layer 203, the first fire-resistant layer 201 is annularly arranged outside the loose tubes 103, an armor layer 300 is arranged outside the first fire-resistant layer 201, the armor layer 300 is annularly arranged on the outer wall of the first fire-resistant layer 201, parallel steel wire reinforcing members 500 are arranged between the outer sheath 400 and the armor layer 300, the second fire-resistant layer 202 is positioned between the parallel steel wire reinforcing members 500 and the armor layer 300, the parallel steel wire reinforcing members 500 are fixedly connected with the armor layer 300 through the second, the third refractory layer 203 is located between the outer jacket 400 and the parallel wire reinforcement member 500.
The first fire-resistant layer 201 is a mica tape, and the first fire-resistant layer 201 is wound on the outer wall of the loose tube 103 through the mica tape.
The second refractory layer 202 and the third refractory layer 203 both adopt CNTS silicon nitride ceramics.
Oversheath 400 is low smoke and zero halogen flame retardant polyolefin oversheath, and the thickness of oversheath 400 is 1mm.
The loose tube 103 is a PBT loose tube, and the thickness of the loose tube 103 is 0.15mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
The thickness of the mica tape is 0.12mm.
The thickness of the first layer of CNTS silicon nitride ceramic is 0.35 mm.
The thickness of the second layer of CNTS silicon nitride ceramic is 0.45 mm.
Example 3:
as shown in fig. 1-2, the present invention provides a technical solution: a flame-retardant composite optical cable comprises a cable core 100 and an outer sheath 400, wherein the cable core 100 comprises optical fiber assemblies 101 and loose tubes 103, the optical fiber assemblies 101 are provided with a plurality of groups, the loose tubes 103 are sleeved outside the optical fiber assemblies 101, fiber paste 102 is filled between the loose tubes 103 and the optical fiber assemblies 101, a fire-resistant layer assembly 200 is arranged outside the cable core 100, the fire-resistant layer assembly 200 comprises a first fire-resistant layer 201, a second fire-resistant layer 202 and a third fire-resistant layer 203, the first fire-resistant layer 201 is annularly arranged outside the loose tubes 103, an armor layer 300 is arranged outside the first fire-resistant layer 201, the armor layer 300 is annularly arranged on the outer wall of the first fire-resistant layer 201, parallel steel wire reinforcing members 500 are arranged between the outer sheath 400 and the armor layer 300, the second fire-resistant layer 202 is positioned between the parallel steel wire reinforcing members 500 and the armor layer 300, the parallel steel wire reinforcing members 500 are fixedly connected with the armor layer 300 through the second, the third refractory layer 203 is located between the outer jacket 400 and the parallel wire reinforcement member 500.
The first fire-resistant layer 201 is a mica tape, and the first fire-resistant layer 201 is wound on the outer wall of the loose tube 103 through the mica tape.
The second refractory layer 202 and the third refractory layer 203 both adopt CNTS silicon nitride ceramics.
The outer sheath 400 is a low-smoke halogen-free flame-retardant polyolefin outer sheath, and the thickness of the outer sheath 400 is 1.4 mm.
The loose tube 103 is a PBT loose tube, and the thickness of the loose tube 103 is 0.2mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
The thickness of the mica tape is 0.15mm.
The thickness of the first layer of the CNTS silicon nitride ceramic is 0.4 mm.
The thickness of the second layer of CNTS silicon nitride ceramic is 0.5 mm.
Example 4:
as shown in fig. 1-2, the present invention provides a technical solution: a flame-retardant composite optical cable comprises a cable core 100 and an outer sheath 400, wherein the cable core 100 comprises optical fiber assemblies 101 and loose tubes 103, the optical fiber assemblies 101 are provided with a plurality of groups, the loose tubes 103 are sleeved outside the optical fiber assemblies 101, fiber paste 102 is filled between the loose tubes 103 and the optical fiber assemblies 101, a fire-resistant layer assembly 200 is arranged outside the cable core 100, the fire-resistant layer assembly 200 comprises a first fire-resistant layer 201, a second fire-resistant layer 202 and a third fire-resistant layer 203, the first fire-resistant layer 201 is annularly arranged outside the loose tubes 103, an armor layer 300 is arranged outside the first fire-resistant layer 201, the armor layer 300 is annularly arranged on the outer wall of the first fire-resistant layer 201, parallel steel wire reinforcing members 500 are arranged between the outer sheath 400 and the armor layer 300, the second fire-resistant layer 202 is positioned between the parallel steel wire reinforcing members 500 and the armor layer 300, the parallel steel wire reinforcing members 500 are fixedly connected with the armor layer 300 through the second, the third refractory layer 203 is located between the outer sheath 400 and the parallel wire reinforcement member 500.
The first fire-resistant layer 201 is a mica tape, and the first fire-resistant layer 201 is wound on the outer wall of the loose tube 103 through the mica tape.
The second refractory layer 202 and the third refractory layer 203 both adopt CNTS silicon nitride ceramics.
The outer sheath 400 is a low-smoke halogen-free flame-retardant polyolefin outer sheath, and the thickness of the outer sheath 400 is 1.6 mm.
The loose tube 103 is a PBT loose tube, and the thickness of the loose tube 103 is 0.25 mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
The thickness of the mica tape is 0.18mm.
The thickness of the first layer of the CNTS silicon nitride ceramic is 0.45 mm.
The thickness of the second layer of CNTS silicon nitride ceramic is 0.55 mm.
Example 5:
as shown in fig. 1-2, the present invention provides a technical solution: a flame-retardant composite optical cable comprises a cable core 100 and an outer sheath 400, wherein the cable core 100 comprises optical fiber assemblies 101 and loose tubes 103, the optical fiber assemblies 101 are provided with a plurality of groups, the loose tubes 103 are sleeved outside the optical fiber assemblies 101, fiber paste 102 is filled between the loose tubes 103 and the optical fiber assemblies 101, a fire-resistant layer assembly 200 is arranged outside the cable core 100, the fire-resistant layer assembly 200 comprises a first fire-resistant layer 201, a second fire-resistant layer 202 and a third fire-resistant layer 203, the first fire-resistant layer 201 is annularly arranged outside the loose tubes 103, an armor layer 300 is arranged outside the first fire-resistant layer 201, the armor layer 300 is annularly arranged on the outer wall of the first fire-resistant layer 201, parallel steel wire reinforcing members 500 are arranged between the outer sheath 400 and the armor layer 300, the second fire-resistant layer 202 is positioned between the parallel steel wire reinforcing members 500 and the armor layer 300, the parallel steel wire reinforcing members 500 are fixedly connected with the armor layer 300 through the second, the third refractory layer 203 is located between the outer jacket 400 and the parallel wire reinforcement member 500.
The first fire-resistant layer 201 is a mica tape, and the first fire-resistant layer 201 is wound on the outer wall of the loose tube 103 through the mica tape.
The second refractory layer 202 and the third refractory layer 203 both adopt CNTS silicon nitride ceramics.
The loose tube 103 is a PBT loose tube, and the thickness of the loose tube 103 is 0.3 mm.
A preparation method of a flame-retardant composite optical cable comprises the following steps:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
The thickness of the mica tape is 0.2mm.
The thickness of the first layer of CNTS silicon nitride ceramic is 0.5 mm.
The thickness of the second layer of CNTS silicon nitride ceramic is 0.6 mm.
Comparative example:
optical cables with flame retardant properties are common in the market.
The data of the performance test results of the flame-retardant composite optical cable provided in examples 1 to 5 and comparative example 1 are shown in the following table:
| examples | Tensile strength | Flame retardant rating |
| Example 1 | 17.2MPa | 3.2V0 |
| Example 2 | 18.8MPa | 1.6V0 |
| Example 3 | 19.6MPa | 1.6V0 |
| Example 4 | 20.3MPa | 0.8V0 |
| Example 5 | 19.1MPa | 0.8V0 |
| Comparative example 1 | 13.2MPa | V-1 |
The above table shows that the flame retardant composite optical cable provided by the invention can improve the overall flame retardant property of the optical cable by adding three layers of flame retardant coatings on the basis of the conventional Chinese-style tubular optical cable structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A flame-retardant composite optical cable comprises a cable core (100) and an outer sheath (400), and is characterized in that: the cable core (100) comprises an optical fiber assembly (101) and a loose tube (103), the optical fiber assembly (101) is provided with a plurality of groups, the loose tube (103) is sleeved outside the optical fiber assembly (101), a fiber paste (102) is filled between the loose tube (103) and the optical fiber assembly (101), a fire-resistant layer assembly (200) is arranged outside the cable core (100), the fire-resistant layer assembly (200) comprises a first fire-resistant layer (201), a second fire-resistant layer (202) and a third fire-resistant layer (203), the first fire-resistant layer (201) is annularly arranged outside the loose tube (103), an armor layer (300) is arranged outside the first fire-resistant layer (201), the armor layer (300) is annularly arranged on the outer wall of the first fire-resistant layer (201), a parallel steel wire reinforcing member (500) is arranged between the outer sheath (400) and the armor layer (300), the second fire-resistant layer (202) is positioned between the parallel steel wire reinforcing member (500) and the armor layer (300), the parallel steel wire reinforcing member (500) is fixedly connected with the armor layer (300) through a second fire-resistant layer (202), and the third fire-resistant layer (203) is located between the outer sheath (400) and the parallel steel wire reinforcing member (500).
2. The flame-retardant composite optical cable according to claim 1, wherein: the first fire-resistant layer (201) is a mica tape, and the first fire-resistant layer (201) is wound on the outer wall of the loose tube (103) through the mica tape.
3. The flame-retardant composite optical cable according to claim 1, wherein: and both the second refractory layer (202) and the third refractory layer (203) adopt CNTS silicon nitride ceramics.
4. The flame-retardant composite optical cable according to claim 1, wherein: the outer sheath (400) is a low-smoke halogen-free flame-retardant polyolefin outer sheath, and the thickness of the outer sheath (400) is 0.5-2 mm.
5. The flame-retardant composite optical cable according to claim 1, wherein: the loose tube (103) is a PBT loose tube, and the thickness of the loose tube (103) is 0.1-0.3 mm.
6. The method for preparing a flame-retardant composite optical cable according to any one of claims 1 to 5, comprising the steps of:
(1) penetrating the optical fiber assembly into a loose sleeve, then adding fiber paste into the sleeve, and surrounding and fixing the optical fiber assembly;
(2) winding a mica tape on the outer wall of the loose sleeve, and then wrapping the armor layer outside the mica tape;
(3) arranging a first layer of CNTS silicon nitride ceramic ring outside an armor layer, and simultaneously wrapping the first layer of CNTS silicon nitride ceramic with a parallel steel wire reinforcing member;
(4) wrapping a second layer of CNTS silicon nitride ceramic outside the parallel steel wire reinforcing member;
(5) and extruding the low-smoke halogen-free flame-retardant polyolefin outer sheath to the outside of the second layer of the CNTS silicon nitride ceramic by using an extruding machine to obtain the flame-retardant composite optical cable.
7. The method for preparing a flame-retardant composite optical cable according to claim 6, wherein: the thickness of the mica tape is 0.1-0.2mm.
8. The method for preparing a flame-retardant composite optical cable according to claim 6, wherein: the thickness of the first layer of the CNTS silicon nitride ceramic is 0.3-0.5 mm.
9. The method for preparing a flame-retardant composite optical cable according to claim 6, wherein: the thickness of the second layer of CNTS silicon nitride ceramic is 0.4-0.6 mm.
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| CN209433088U (en) * | 2019-03-28 | 2019-09-24 | 江苏奥通光电缆科技有限公司 | A kind of flame-retardant environmental protection optical cable |
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