CN115343817A - Rated breaking force overhead micro-beam optical cable and manufacturing process thereof - Google Patents
Rated breaking force overhead micro-beam optical cable and manufacturing process thereof Download PDFInfo
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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
- G02B6/441—Optical cables built up from sub-bundles
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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
- G02B6/443—Protective covering
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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
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
- G02B6/4433—Double reinforcement laying in straight line with optical transmission element
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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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- 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
- G02B6/4482—Code or colour marking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Abstract
The invention belongs to the field of communication optical cables, and provides a rated breaking force overhead microbeam optical cable and a manufacturing process thereof, wherein the optical cable comprises a microbeam tube optical unit, water-blocking yarns, a water-blocking tape and an outer sheath, the total number of cores of optical fibers is 72-144 cores, the outer diameter of the optical cable is 7.0 +/-0.1 mm, the breaking force range is 1350N-2000N, the optical cable can ensure that the inner cavity concentration of the optical fibers is improved under the condition that the outer diameter index and the overall performance (tensile property, alternating voltage resistance, air tightness and the like) of 7.0 +/-0.1 mm are not reduced, and the range of the breaking force F is ensured to be 1350N-2000N, so that the safety performance of the optical cable is ensured, and the problems of more and more shortage of laying pipeline resources and construction cost are solved.
Description
Technical Field
The application relates to the field of communication optical cables, in particular to a rated breaking force overhead microbeam optical cable and a manufacturing process thereof.
Background
Worldwide, power transmission is still dominated by overhead forms. The reliability of the nearly ubiquitous power tower is much higher than that of the common communication pole line, the potential advantages of the ubiquitous power tower are developed in recent times, and various optical cables are arranged on the power tower (or a power line) in an overhead mode in various modes such as multiplexing, adding and adding. The aerial optical cable is an optical cable which is hung on an electric pole for use. The overhead optical cable laying mode can utilize the original overhead open circuit pole line, save construction cost and shorten construction period.
The rated breaking force overhead optical cable is an optical cable capable of meeting the safety performance of the optical cable, the rated breaking force means that when the optical cable bears the pulling force in a specified range, the optical cable can be safely broken, and the damage to the surrounding environment is prevented, for example, the optical cable is cut and rubbed with vehicles or construction machinery, and if the breaking force value of the optical cable is too large, the optical cable tower pole (or the electric power tower) is dragged, inclined and even collapsed by the optical cable, so that the damage to surrounding personnel, vehicles, buildings and the like is caused, and safety accidents are caused.
With the problems of more and more shortage of existing laying pipeline resources and construction cost, higher requirements are put forward on the inner cavity density (the inner cavity density = the number of optical fiber cores/the cross-sectional area of an inner cavity) of the existing optical cable. The existing 36-core light safety optical cable with the outer diameter of 7.0mm is small in inner cavity density and small in number of optical fiber cores, and laying requirements are difficult to meet. In addition, the breaking force value of the existing light safety optical cable is difficult to guarantee, the breaking force is small, the optical cable is easy to damage (such as laying pulling force, windy weather and the like), the maintenance cost is increased, the breaking force is too large, and the line rod is easy to drag down when the conditions such as vehicle top hanging and the like are met accidentally, so that the paralysis of the whole line is caused, and the safety effect cannot be realized.
Disclosure of Invention
In view of the above, an objective of the present application is to provide an overhead microbeam optical cable with a rated breaking force and a manufacturing process thereof.
The embodiment of the application provides a rated breaking force overhead micro-beam optical cable which comprises at least one micro-beam tube optical unit, wherein a plurality of optical fibers are arranged in each micro-beam tube optical unit; the micro-beam tube optical unit is sequentially wrapped with a water blocking tape and an outer sheath from inside to outside, two groups of reinforcing members are embedded in the outer sheath, the two groups of reinforcing members are arranged at intervals of 180 degrees along the circumferential direction of the outer sheath and extend in parallel along the length direction of the micro-beam optical cable, the reinforcing members are arranged in the outer sheath close to the water blocking tape, and each group of reinforcing members comprises three copper-plated steel stranded wires; water-blocking yarns are arranged outside the micro-beam tube light unit and in the water-blocking tape; the external diameter of the micro-beam optical cable is 7.0 +/-0.1 mm, the total core number of the optical fibers in the micro-beam optical cable is 72-144 cores, and the breaking force range is 1350N-2000N; the tensile property of the micro-beam optical cable meets the following requirements: respectively applying 800N and 150N pulling forces to the micro-beam optical cable with the length not less than 25m for 10 minutes, and meeting the following conditions: when the optical cable bears 800N, the strain of the optical cable is less than 0.667%; the optical cable strain is less than 0.2% when bearing 150N; residual strain after tensile force removal is less than 0.05%; the additional attenuation is less than 0.05dB; the micro-beam optical cable is not damaged; the alternating voltage resistance of the micro-beam optical cable meets the following requirements: applying an alternating voltage with the maximum amplitude of 15kv and the frequency of 50hz between a reinforcing member of the micro-bundle optical cable with the length of 5 +/-0.5 meters and the ground, wherein the micro-bundle optical cable can maintain the time not to be punctured by the alternating voltage to be not less than 5min; the air tightness of the micro-beam optical cable meets the following requirements: one end of the micro-bundle optical cable is placed in a pressurizing chamber, the other end of the micro-bundle optical cable extends out of the pressurizing chamber, the pressurizing chamber is pressurized to 30kPa +/-3 kPa, a gas pressure detection point is selected on the micro-bundle optical cable, and the micro-bundle optical cable is placed for 48 hours without change in pressure of the gas pressure detection point.
In some embodiments, the outer sheath has a thickness of 1.4 to 1.6mm, the ferrule outer diameter of the microbeam tube optical unit has a size of 1.4 to 1.5mm, and the outer diameter of the optical fiber does not exceed 200 μm.
In some embodiments, the total core number is 72 cores, and the concentration of the inner cavity of the optical cable is 6.7-7.2 cores/mm 2 Or the total core number is 96 cores, and the concentration of the inner cavity of the optical cable is 8.9-9.4 cores/mm 2 Or the total core number is 144 cores, and the concentration of the inner cavity of the optical cable is 134-13.9 cores/mm 2 。
In some embodiments, the optical cable has a out-of-roundness <2.82%.
In some embodiments, the ac voltage resistance of the micro-bundle optical cable satisfies: and applying an alternating voltage with the maximum amplitude of 15kv and the frequency of 50hz between the reinforcing member of the micro-bundle optical cable with the length of 5 +/-0.5 meters and the ground, wherein the micro-bundle optical cable can maintain the time not to be punctured by the alternating voltage for not less than 5min.
In some embodiments, there are a plurality of the micro-beam tube optical units, and the water-blocking yarn includes 1 3000D expanded water-blocking yarn at the cable core of the optical cable, and an expanded water-blocking yarn twisted with the micro-beam tube optical units outside the cable core.
In some embodiments, the outer sheath is High Density Polyethylene (HDPE).
In some embodiments, the optical fibers within the microbeam tube optical unit are stacked in multiple steps.
In some embodiments, the micro-bundle fiber optic cable has an air tightness satisfying: one end of the micro-bundle optical cable is placed in a pressurizing chamber, the other end of the micro-bundle optical cable extends out of the pressurizing chamber, the pressurizing chamber is pressurized to 30kPa +/-3 kPa, a gas pressure detection point is selected on the micro-bundle optical cable, and the micro-bundle optical cable is placed for 48 hours without change in pressure of the gas pressure detection point.
In a second aspect, an embodiment of the present application further provides a manufacturing process of a breaking force rated overhead microbeam optical cable as described in any of the above embodiments, including the steps of: and (3) optical fiber treatment: performing color ring treatment on half of the optical fibers, and then coloring all the optical fibers; manufacturing a microbeam tube light unit: grouping the optical fibers, wherein half of the optical fibers in each group are colorless ring optical fibers and half are colored ring optical fibers, and the optical fibers in each group are stranded, coated with fiber paste and subjected to extrusion molding to form a micro-beam tube optical unit; longitudinally wrapping the water blocking tape: stranding the micro-beam tube optical units, adding water-blocking yarns in the stranding, and enabling the stranded micro-beam tube optical units to enter a water-blocking tape longitudinal wrapping device to finish longitudinal wrapping of the water-blocking tape; and (3) extrusion molding: carry out the extrusion molding after indulging the package, extrusion molding in-process extrusion molding product gets into the vacuum design basin, accomplishes final shaping through the vacuum design basin.
In some embodiments, the vacuum shaping water tank comprises a closed cooling water tank, the length of the cooling water tank is about 3m, a shaping copper pipe is installed on one side of the cooling water tank, a sleeve outlet is correspondingly installed on the other side of the cooling water tank in a coaxial line, and the size error of the shaping copper pipe is not more than +/-0.02 mm.
In some embodiments, a symmetrical color scale is added to the extruded cable for identification during extrusion.
The beneficial effect that this application can reach.
The application provides a rated breaking force overhead microbeam optical cable, which comprises a microbeam tube optical unit, water-blocking yarns, a water-blocking tape and an outer sheath, wherein the total core number of the optical fiber is 72-144 cores, the outer diameter of the optical cable is 7.0 +/-0.1 mm, the breaking force range is 1350N-2000N, and the optical cable can ensure that the outer diameter index and the overall performance (tensile property, 15KV alternating voltage resistance, air tightness and the like) of 7.0 +/-0.1 mm are not reduced, so that the concentration of the inner cavity of the optical fiber is improved to 6.7-7.2 cores/mm 2 8.9-9.4 cores/mm 2 Or 13.4-13.9 cores/mm 2 And the range of the breaking force F is ensured to be 1350N or more and 2000N or less, so that the safety performance of the optical cable is ensured, and the problems of more and more shortage of laying pipeline resources and construction cost are solved. In addition, the optical cable has better tensile resistance, 800N tensile force and 150N tensile force are respectively applied to a section of overhead microbeam optical cable with the rated breaking force, the length of which is greater than or equal to 25m, for 10 minutes, and the following conditions are met: when the optical cable bears 800N, the strain of the optical cable is less than 0.667%; the optical cable strain is less than 0.2% when bearing 150N; residual strain after the pulling force is removed is less than 0.05 percent; the additional attenuation is less than 0.05dB; no other parts are damaged (for example, the outer sheath has no visible crack and the like).
In order to make the aforementioned objects, features and advantages of the present application comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural view illustrating a 72-core breaking force rated overhead micro-beam optical cable according to the present invention;
fig. 2 is a schematic structural view illustrating a 96-core breaking force rated overhead micro-beam optical cable according to the present application;
fig. 3 is a schematic structural view illustrating a 144-core breaking force rated overhead micro-beam optical cable according to the present application;
fig. 4 is a schematic structural diagram illustrating a vacuum-shaped water tank used in a manufacturing process of a breaking force rated overhead micro-beam optical cable according to the present application.
Wherein 1-optical fiber, 2-microbeam tube light unit, 3-water-blocking yarn, 4-reinforcing component, 5-water-blocking tape, 6-outer sheath, 7-color bar, 8-cooling water tank, 9-shaping copper tube, 10-pipeline, 11-vacuum pumping device, and 12-sleeve outlet.
Detailed Description
The terms "comprising," "including," or "characterized by" in the description and claims of this application and the accompanying drawings are synonymous with "including," "containing," or "characterized by," and are inclusive or open-ended and do not exclude additional unrecited elements or method steps. "comprising" is a term of art used in the language of the claims and means that the recited elements are present, but other elements can be added and still form a structure or method within the scope of the claims.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures, and moreover, the terms "first," "second," "third," etc. are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. The term "about" in this application is meant to encompass minor variations (up to +/-10%) from the stated value.
The rated breaking force overhead optical cable is an optical cable capable of meeting the safety performance of the optical cable, the rated breaking force means that the optical cable can be safely broken when the optical cable bears the pulling force in a specified range, the damage to the surrounding environment is prevented, for example, the optical cable is scratched and rubbed by vehicles or construction machinery, if the breaking force value of the optical cable is too large, an optical cable tower pole (or an electric power tower) is dragged, inclined and even collapsed by the optical cable, so that the damage to surrounding personnel, vehicles, buildings and the like is caused, and safety accidents are caused.
With the problems of more and more shortage of existing pipeline resources and construction cost, higher requirements are put forward on the inner cavity density (the inner cavity density = the number of optical fiber cores/the sectional area of the inner cavity) of the existing optical cable. The existing 36-core light safety optical cable with the outer diameter of 7.0mm is small in inner cavity density and small in number of optical fiber cores, and laying requirements are difficult to meet. In addition, the breaking force value of the existing light safety optical cable is difficult to guarantee, the breaking force is small, the optical cable is easy to damage (such as laying and pulling, windy weather and the like), the maintenance cost is increased, the breaking force is too large, and the line rod is easy to drag down when the conditions such as vehicle top hanging and the like are met accidentally, so that the paralysis of the whole line is caused, and the safety effect cannot be realized.
Under the condition of ensuring that the outer diameter index and the overall performance are not changed, the number of optical fiber cores is increased, namely, the concentration of the inner cavity of the optical fiber is increased, and the breaking force is ensured to be within the specified breaking value range, so that greater difficulty exists. To this end, the present application provides a rated breaking force overhead micro-beam optical cable, comprising at least one micro-beam tube optical unit, each micro-beam tube optical unit having a plurality of optical fibers therein; the micro-beam tube light unit is sequentially wrapped with a water-blocking tape and an outer sheath from inside to outside, two groups of reinforcing members are symmetrically embedded in the outer sheath in parallel along the circumferential direction, the reinforcing members are arranged in the outer sheath close to the water-blocking tape, and each group of reinforcing members comprises three copper-plated steel stranded wires; water-blocking yarns are arranged outside the micro-beam tube light units and in the water-blocking tapes; the total number of the optical fibers in the optical cable is 72-144 cores and the like, the outer diameter of the optical cable is 7.0 +/-0.1 mm, and the breaking force range is 1350N-2000N.
The lower limit value of the breaking force is set for the first time in the application, the range of the breaking force F is guaranteed to be 1350N or more and 2000N or less, the safety performance of the optical cable is guaranteed, in addition, the outer diameter of the optical cable is 7.0mm, the total number of the cores is 72, 96 or 144 cores and the like, the optical fiber inner cavity density is high, the optical fiber inner cavity density is improved under the condition that the overall performance is not reduced, and therefore the safety performance of the optical cable is guaranteed, and the problems that existing laying pipeline resources are more and more nervous and the construction cost is solved.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Example 1:
in embodiment 1 of the present application, a 72-core overhead microbeam optical cable with rated breaking force is provided, as shown in fig. 1, including 3 microbeam tube optical units 2, where there are 24 optical fibers 1 in each microbeam tube optical unit 2, that is, the total number of cores of the optical fibers in the optical cable is 72 cores. And a 3000D expansion water-blocking yarn 3 is arranged at the cable core of the optical cable, and an expansion water-blocking yarn 3 twisted with the micro-beam tube optical unit is arranged outside the cable core. The microbeam tube light unit 2 is sequentially wrapped with a water-blocking tape 5 and an outer sheath 6 from inside to outside, and a reinforcing member 4 is embedded in the outer sheath 6.
In the present embodiment 1, the 24 optical fibers in each of the microbeam tube optical units 2 are arranged at intervals along the inscribed square or rectangle of the ferrule of the microbeam tube optical unit 2.
In this embodiment 1, the outer diameter of the optical cable is 7.0 ± 0.1mm, and the breaking force F range is: f is more than or equal to 1350N and less than or equal to 2000N. The out-of-roundness of the optical cable is less than 2.82%.
In this embodiment, the water blocking tape 5 is longitudinally wrapped outside the optical unit 2 of the micro-beam tube, and the volume of the longitudinally wrapped optical cable is smaller, and the micro-beam tube is softer, so that the longitudinal wrapping force is smaller, and the optical unit is not easily damaged.
In some embodiments, the surface of the water-blocking tape 5 close to the microbeam tube light unit 2 is a smooth surface, and the surface of the water-blocking tape 5 close to the outer sheath 6 is a rough surface. Therefore, the outer sheath 6 is conveniently formed, meanwhile, the smooth surface of the water blocking tape 5 can face the micro-beam tube optical unit 2, the water blocking tape 5 is prevented from scratching the micro-beam tube optical unit 2, and the influence of the water blocking tape 5 on the transmission performance of the micro-beam tube optical unit 2 is reduced.
The size of the optical cable must ensure the external diameter index of 7.0 +/-0.1 mm according to the matching degree of the hardware fitting on the construction site. If the outer diameter index and the overall performance are guaranteed to be unchanged, the number of the optical fiber cores is increased, namely the inner cavity concentration of the optical fiber is increased (the inner cavity concentration = the number of the optical fiber cores/the sectional area of the inner cavity), and the breaking force is guaranteed to be under the specified breaking value (1350-2000N), so that great difficulty exists. This requires a comprehensive and inventive design of the thickness and material of the outer sheath, the selection of the size and material of the reinforcing member, the size of the jacket tube in the microbeam tube optical unit, the size specification of the optical fiber, and the like.
Outer sheath adopts High Density Polyethylene (HDPE) in this embodiment, has the characteristic of low shrink, slows down the deformation of product after meeting water-cooling, has also guaranteed the high low temperature and the ageing behavior in product later stage simultaneously. Meanwhile, the high-density polyethylene outer sheath can improve the water seepage prevention effect of the optical cable, meet the requirements of a 24H soaking test and ensure that no water seeps in the soaking process.
Meanwhile, the thickness of the outer sheath of the optical cable must ensure that the product meets the side pressure resistance performance test (the side pressure resistance performance test requirement that 2000N of force is applied to the two sides of the optical cable for 10 min). The prior 36 cores with small core number and small internal optical fiber number have relatively loose requirements on lateral pressure resistance performance indexes, but the 72 cores have the problem that the internal space is further compressed due to the increase of the optical fiber number, so that the wall thickness of the outer sheath is easily insufficient, and the lateral pressure test requirements can not be met. In the invention, on the basis of researching the structure of the 36-core optical cable, a critical point of wall thickness meeting the requirement of flattening is searched as a reference, and the strict limitation of the outer diameter of the optical cable is considered, so that the thickness of the outer sheath is designed to be 1.4-1.6 mm, such as 1.4mm, 1.45mm, 1.5mm1.55mm and 1.6mm.
In this embodiment two sets of said reinforcement elements 4 are arranged in parallel symmetry within the outer sheath 6. Two groups of reinforcing members 4 are symmetrically embedded in the outer sheath 6 in parallel along the circumferential direction, the reinforcing members 4 are arranged in the outer sheath close to the water blocking tape 5, and each group of reinforcing members 4 comprises three copper-plated steel stranded wires. If the reinforcing members are too close to the outside, the thickness of the outer side wall is too thin, and the risk of breakdown exists, and the performance of resisting 15KV voltage cannot be met, so that the two groups of reinforcing members 4 are arranged in the outer sheath 6 and close to the water blocking tape 5.
The optical cable is overhead by adopting the parallel reinforcing component, the reinforcing component needs to meet the requirement of tensile fiber change, simultaneously, the optical cable also needs to be subjected to brittle failure of a product under a specified force value (1350-2000N), meanwhile, the size requirement of the product is fixed, and the nominal 7.0mm outer diameter requirement needs to be met, so that the selection of the parallel reinforcing component is crucial, and the following requirements are considered for the selection of the parallel reinforcing component: (1) firstly, considering the overall size of a product and the requirements of the wall thickness of the inner side and the outer side of a reinforcing member, the size of the reinforcing member needs to be less than 0.8mm, otherwise, the size is too large, if the reinforcing member is close to the outer side, a mark appears, and if the reinforcing member is close to the inner side, the reinforcing member is exposed; (2) the reinforcing component needs to be soft and has good bending performance, so that the product can be kept to have good winding and bending performance; (3) and finally, considering that the internal components bear corresponding force values when the optical cable is broken under the rated force value, analyzing that a single reinforcing member has the breaking force value of 400N-600N. Therefore, in the present embodiment, the reinforcing members are copper-plated steel strands, and each group of the reinforcing members 4 includes three copper-plated steel strands.
In other embodiments the reinforcement member 4 may also be a non-metallic element, such as a glass fibre reinforced plastic rod, an aramid fibre reinforced plastic rod, a carbon fibre reinforced plastic rod, or the like. When the nonmetal reinforcing component is adopted, the aerial optical cable is an all-dielectric optical cable and can be suitable for areas with high lightning or areas with strong electromagnetic fields.
Because the optical fiber is provided with the 72 cores, the size of the sleeve of the micro-beam tube optical unit and the size of the optical fiber both need to be reasonably designed, so that the breaking force is ensured to be under a specified breaking value (1350-2000N) under the condition of ensuring that the outer diameter index and the overall performance are not changed. The outer diameter of the sleeve of the microbeamformer tube optical unit 2 in the present application is 1.4-1.5mm, such as 1.4mm, 1.45mm, 1.5mm, with the outer diameter of the optical fiber not exceeding 200 μm, such as 195 μm, 200 μm being optional.
For example, in this embodiment 1, the outer diameter of the sleeve of the microbeam tube optical unit 2 is 1.5mm, and the outer diameter of the optical fiber is 200um.
In this embodiment 1, since the outer diameter of the product is fixed to be 7.0mm, and the thickness of the outer sheath is 1.4mm to 1.6mm, the breaking force value of the outer sheath material and the corresponding value of the tensile force value under 0.667% strain are obtained by performing theoretical calculation according to the lowest tensile strength of 20Mpa and the highest elastic modulus of 1400Mpa of the outer sheath material.
(1) When the outer sheath is 1.4mm thick: sheath rupture force value under 20Mpa tensile strength:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.4mm*2)/2] 2 }*20MPa＝492.4N；
tensile value at 0.667% strain of the modulus of elasticity at 1400 MPa:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.4mm*2)/2] 2 }*1400MPa*0.667％＝229.9N；
because the construction environment is not lower than 800N, the radius size R of the reinforcing pieces on the two sides is corresponding to 0.667% strain according to the minimum force value of 800N: 2 pi R 2 *190gpa × 0.667% =800N-229.9N, giving R =0.2676mm; whereas, at the theoretically calculated dimensions of the reinforcement R, the breaking force value of the theoretical reinforcement is: 2 pi xi (0.2676 mm) 2 *1900mpa =854.4n, and after embedding the reinforcement, the sheath cross-sectional area will slightly decrease, decreasing the value of the post-theoretical sheath rupture force:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.4mm*2)/2] 2 -2*π*(0.2676mm) 2 20mpa =483.4n. So the theoretical minimum breaking force value is obtained: 854.4N +483.4N =1335.8N。
(2) When the outer sheath is 1.5mm thick: sheath rupture force value under 20Mpa tensile strength:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.5mm*2)/2] 2 }*20MPa＝518.1N；
tensile value at 0.667% strain of modulus of elasticity at 1400 MPa:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.5mm*2)/2] 2 }*1400MPa*0.667％＝241.9N；
because the construction environment is not lower than 800N, the radius size R of the reinforcing pieces on the two sides is corresponding to 0.667% strain according to the minimum force value of 800N: 2 pi R 2 *190gpa × 0.667% =800N-241.9N, giving R =0.2648mm; whereas, at the theoretically calculated dimensions of the reinforcement R, the breaking force values of the theoretical reinforcement are: 2 pi (0.2648 mm) 2 p 1900mpa =836.6n, and the jacket cross-sectional area is slightly reduced after the reinforcements are embedded, and the theoretical jacket rupture value is reduced:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.5mm*2)/2] 2 -2*π*(0.2648mm) 2 20mpa =509.3n. So the theoretical lowest breaking force value is obtained: 836.6N +509.3N =1345.9N.
(3) When the outer sheath is 1.6mm thick: sheath rupture value under tensile strength of 20 Mpa:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.6mm*2)/2] 2 }*20MPa＝542.6N；
tensile value at 0.667% strain of the modulus of elasticity at 1400 MPa:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.6mm*2)/2] 2 }*1400MPa*0.667％＝253.3N；
because the construction environment is not lower than 800N, the radius dimension R of the reinforcing pieces on two sides is corresponding to the strain of 0.667 percent according to the minimum force value of 800N: 2 pi R 2 *190gpa × 0.667% =800N-253.3N, giving R =0.2620mm; whereas, at the theoretically calculated dimensions of the reinforcement R, the breaking force values of the theoretical reinforcement are: 2 pi (0.2620 mm) 2 1900mpa =819.1n, and after the reinforcement is embedded, the sheath cross-sectional area is slightly reduced, and the theoretical sheath rupture force value is reduced:
{π*(7.0mm/2) 2 -π*[(7.0mm-1.6mm*2)/2] 2 -2*π*(0.2620mm) 2 20mpa } 20mpa =534n. So the theoretical lowest breaking force value is obtained: 819.1N +534N=1353.1N.
According to the theoretical calculation of (1) to (3), the minimum value of the breaking force F of the rated breaking force overhead microbeam optical cable is 1335.8N. Considering that the allowable errors of the dimensions such as the thickness of the outer sheath, the diameter of the reinforcing member, the outer diameter of the sleeve of the optical unit of the micro-beam tube and the like in the manufacturing process have influence on the breaking force of the optical cable and the increase of the breaking force of the water blocking tape, the lower limit value of the breaking force F in the invention is corrected to 1350N.
The upper limit value of the breaking force F of the rated breaking force overhead microbeam optical cable is 2000N, and when the upper limit value exceeds 2000N, equipment, a line pole and the like on a line are damaged under the dragging of the force value, so that 2000N is the maximum protection force value.
The breaking force F range of the present invention is therefore: f is more than or equal to 1350N and less than or equal to 2000N.
And the minimum tensile force value that the optical cable can bear in the invention is more than 800N. The secondary extra length (namely the length of the outer sheath exceeding the micro-beam tube) after micro-beam stranding is small and is corrected according to 0.02 percent, the internal main stress elements are copper-plated steel stranded wires and sheath materials, and other materials can be ignored: force value of copper-plated stranded wire under 0.667% strain:
the cross-sectional area of 6 copper-plated steel wires (elastic modulus) (0.667% + 0.02%) =6 × pi (0.32 mm/2) 2 × 190gpa × 0.687% =629.87N. Force value of jacket material at 0.667% strain: sheath cross-sectional area sheath material elastic modulus (0.667% + 0.02%) = { pi (7.0 mm/2) 2 -π*[(7mm-1.5mm*2)/2] 2 -6*π*(0.32mm/2) 2 0.687% = 174.74N) } 1000mpa × 0.687%, force value at 0.667% strain: 629.87N +174.74=804.61N.
Through the test of the tensile property of the optical cable, respectively applying 800N and 150N tensile forces to a section of overhead microbeam optical cable with the rated breaking force, the length of which is more than or equal to 25m, for 10 minutes, and meeting the following conditions: (1) when the optical cable bears 800N, the strain of the optical cable is less than 0.667%; (2) when the strain of the optical cable is born at 150N, the strain is less than 0.2 percent; (3) residual strain after the pulling force is removed is less than 0.05 percent; (4) the additional attenuation is less than 0.05dB; (5) there is no damage to other components, i.e., the cable is not damaged (e.g., the outer jacket is not visibly cracked). The residual strain refers to that after a certain load is applied to the material, the compressive strength and the tensile strength of the material are high, the deformation generated by the material is small, and the stress is stored in the material and is not released. The additional attenuation refers to the residual additional attenuation of the cable, and the absolute value of the change in attenuation after the end of the test is called residual additional attenuation.
Because the optical cable is built on stilts to be set up and need consider the optical cable destruction that the thunder and lightning overvoltage caused, the high voltage short-time phenomenon also causes the oversheath to puncture promptly. The optical cable in this application needs to satisfy certain ac voltage resistance. Through the performance test of alternating voltage resistance: the product testing length is 5 +/-0.5 meter, the product with the testing length is placed in a water tank, the length of the two ends of the product extending out of the water tank is not more than 0.5m, the middle part of the product is completely immersed in water for not less than 24 hours, the water tank is grounded, alternating current voltage with the maximum amplitude of 15kv and the frequency of 50hz is applied between a product metal reinforcing part and the ground, and once the voltage reaches 15kv, the product can be maintained for not less than 5 minutes without being punctured by the alternating current voltage.
In order to ensure good air tightness of the optical cable, the rated breaking force overhead microbeam optical cable needs to be subjected to an air tightness test. And (3) testing the air tightness: one end of the optical cable is placed in the pressurizing chamber, the other end of the optical cable extends out of the pressurizing chamber, the pressurizing chamber is pressurized to 30kPa +/-3 kPa, a gas pressure detection point is selected on the optical cable, a pressure gauge is used for detecting the pressure of the gas pressure detection point, and the reading of the pressure gauge of the gas pressure detection point is unchanged after the optical cable is placed for 48 hours. The gas pressure detection points may be set such that the first gas pressure detection point is 1m from the pressurizing chamber and the distance between the subsequent adjacent gas pressure detection points is set to 250mm.
In the embodiment, for convenience of identification, the color bars 7 are symmetrically arranged on two sides of the outer surface of the outer sheath 6 in parallel, the color bars 7 may be embedded in the outer sheath 6, and the outermost edges of the color bars 7 are exposed on the surface of the outer sheath 6. In other embodiments, the color bar 7 may be a convex or concave structure formed on the surface of the outer sheath 6. When the colour bar 7 is a convex or concave structure on the outer sheath 6, the colour bar 7 can be triangular or semicircular in shape, and the depth of the concave or the height of the convex is generally not more than 0.2mm. The color of the color bar 7 can be set as desired, for example yellow, blue, red, etc.
In the 72-core breaking force rated overhead microbeam optical cable of the embodiment 1, the concentration of the optical fiber inner cavities = the number of optical fiber cores/the cross-sectional area of the inner cavity. Number of optical fiber cores =72 in example 1, cross-sectional area of lumen: pi x [ (outer diameter-outer sheath wall thickness-water blocking tape thickness)/2] 2 . The concentration of the optical fiber inner cavities of the 72-core breaking force-rated overhead microbeam optical cable of the present invention is shown in table 1 below.
| Number of cores | The concentration of the inner cavity of the optical fiber | Concentration of conventional aerial optical cable optical fiber inner cavity |
| 72 | 6.7 cores/mm 2 | 2.6 cores/mm 2 |
It can be seen that the 72-core rated breaking force overhead microbeam optical cable in embodiment 1 can ensure that the concentration of the inner cavity of the optical fiber is increased to 6.7 cores/mm without reducing the outer diameter index and the overall performance (tensile resistance, lateral pressure resistance, 15KV voltage resistance, and the like) of 7.0 ± 0.1mm 2 And the range of the breaking force F is ensured to be 1350N or more and 2000N or less, so that the safety performance of the optical cable is ensured, and the problems of more and more shortage of laying pipeline resources and construction cost are solved.
The manufacturing process of the 72-core rated breaking force overhead microbeam optical cable in the embodiment comprises the following steps:
the first step is as follows: and (3) optical fiber treatment: performing color ring treatment on half of 72 optical fibers, and then coloring all the optical fibers according to the color requirement;
the second step is that: manufacturing a microbeam tube light unit: grouping optical fibers, wherein each 24 optical fibers are grouped into one group, half of each group of optical fibers are colorless ring optical fibers, and half of each group of optical fibers are colored ring optical fibers, namely 12 colorless ring optical fibers and 12 colored ring optical fibers are arranged in each group, the optical fibers in each group are subjected to S or SZ twisting, then coating fiber paste by a fiber paste heating device, and performing extrusion molding to form 3 micro-beam tube optical units after coating the fiber paste;
the third step: longitudinally wrapping the water blocking tape: s or SZ stranding is carried out on the 3 micro-beam tube optical units, a high-expansion water-blocking yarn is added at the stranding center, and the stranded micro-beam tube optical units enter a water-blocking tape longitudinal wrapping device to finish longitudinal wrapping of the water-blocking tape;
the fourth step: and (3) extrusion molding: carry out the extrusion molding after indulging the package, the extrusion molding in-process carries out the sign through the color code that the quick-witted equipment of color strip adds the symmetry on the optical cable of extruding, and the extrusion molding product gets into the vacuum and stereotypes the basin simultaneously, accomplishes final shaping through the vacuum and stereotypes the basin.
And forming and cooling and shaping in the vacuum shaping water tank in a mode of vacuumizing a forming die. As shown in fig. 4, the vacuum shaping water tank includes a closed cooling water tank 8, the length of the cooling water tank 8 is 3m, a shaping copper pipe 9 is installed on one side of the cooling water tank 8, a sleeve outlet 12 is coaxially and correspondingly installed on the other side of the cooling water tank, a certain amount of cooling water is contained in the cooling water tank, a cavity is reserved above the cooling water tank, the cavity is communicated with a vacuum pumping device 11 through a pipeline 10, and the vacuum pumping device includes a vacuum pumping pump to keep the cooling water tank in a vacuum state or a state close to the vacuum state. And the micro beam tube light unit longitudinally wrapped with the water-blocking tape and the extruded outer sheath are led into a shaping copper tube and a vacuum shaping water tank, preliminarily shaped on the shaping copper tube, and then cooled and shaped in the vacuum shaping water tank.
In the embodiment, a vacuum shaping water tank is adopted to replace a common water tank, meanwhile, the deviation range of the outer diameter is small, the length of a cooling water tank of the vacuum shaping water tank is increased to about 3m, and the product is ensured to have a sufficient shaping range for shaping; on the vacuum sizing die, a sizing copper pipe processed with high precision size is adopted, and the size error of the sizing copper pipe is not more than +/-0.02 mm, so that the size of the product after being formed is ensured.
Example 2:
the 96-core breaking force rated overhead microbeam optical cable provided in example 2 is different from the 72-core breaking force rated overhead microbeam optical cable provided in example 1 in that: the optical fiber cable comprises four micro-beam tube optical units 2, wherein each micro-beam tube optical unit 2 is provided with 24 optical fibers 1, namely the optical fiber cable has 96 cores; in example 2, the outer diameter of the ferrule of the microbeam tube optical unit 2 and the outer diameter of the optical fiber 1 are further reduced, for example, the outer diameter of the ferrule of the microbeam tube optical unit 2 is 1.4mm, and the outer diameter of the optical fiber is 195 μm.
The remaining technical features, such as the position of the color scale in example 2, the thickness and material of the outer sheath 6, the material and wrapping manner of the water-blocking tape 5, the size and material of the reinforcing member 4, and the material and diameter of the water-blocking yarn 3, are unchanged from those in example 1. Therefore, the 96-core rated breaking force overhead microbeam optical cable in the embodiment 2 can also ensure that the concentration of the inner cavity of the optical fiber is improved and the range of the breaking force F is 1350N or less than or equal to F or less than 2000N under the condition that the outer diameter index and the overall performance (tensile resistance, lateral pressure resistance, 15KV voltage resistance and the like) of 7.0 +/-0.1 mm are not reduced.
In example 2, the concentration of the optical fiber lumens = the number of optical fiber cores/the cross-sectional area of the lumen, which is a 96-core breaking force-rated overhead microbeam optical cable. In this example 2, the number of optical cores =96, and the cross-sectional area of the inner cavity: pi x [ (outer diameter-outer sheath wall thickness-water blocking tape thickness)/2] 2 . The concentration of the optical fiber inner cavities of the 96-core breaking force-rated overhead microbeam optical cable of the present invention is shown in table 2 below.
| Number of cores | The concentration of the inner cavity of the optical fiber | Concentration of conventional aerial optical cable optical fiber inner cavity |
| 96 | 8.9 cores/mm 2 | 2.4 cores/mm 2 |
In embodiment 2, the 96-core rated breaking force overhead microbeam optical cable can ensure that the optical fiber inner cavity concentration is increased to 8.9 cores/mm without reducing the outer diameter index and the overall performance (tensile resistance, lateral pressure resistance, 15KV voltage resistance, and the like) of 7.0 ± 0.1mm 2 And the range of the breaking force F is more than or equal to 1350N and less than or equal to 2000N, so that the safety performance of the optical cable is ensured, and the problems of more and more shortage of laying pipeline resources and construction cost are solved.
The manufacturing process of the 96-core rated breaking force overhead microbeam optical cable in the embodiment comprises the following steps:
the first step is as follows: and (3) optical fiber treatment: performing color ring treatment on half of 96 optical fibers, and then coloring all the optical fibers according to the color requirement;
the second step: manufacturing a microbeam tube light unit: grouping optical fibers, wherein each 24 optical fibers are grouped into one group, half of each group of optical fibers are colorless ring optical fibers, and half of each group of optical fibers are colored ring optical fibers, namely 12 colorless ring optical fibers and 12 colored ring optical fibers are arranged in each group, the optical fibers in each group are subjected to S or SZ twisting, then coating fiber paste by a fiber paste heating device, and performing extrusion molding to form 4 micro-beam tube optical units after coating the fiber paste;
the third step: longitudinally wrapping the water blocking tape: s or SZ stranding is carried out on 4 micro-beam tube optical units, a high-expansion water-blocking yarn is added to a stranding center, and the stranded water-blocking yarn enters a water-blocking tape longitudinal wrapping device to finish longitudinal wrapping of the water-blocking tape;
the fourth step: and (3) extrusion molding: carry out the extrusion molding after indulging the package, the extrusion molding in-process carries out the sign through the color code that the quick-witted equipment of color strip adds the symmetry on the optical cable of extruding, and the extrusion molding product gets into the vacuum and stereotypes the basin simultaneously, accomplishes final shaping through the vacuum and stereotypes the basin.
Wherein the vacuum shaping water tank is described in the embodiment 1, and the description is omitted.
Example 3
Example 3 provides a 144-core breaking force rated overhead micro-beam optical cable, which is different from example 2 in that: the arrangement of the optical fibers 1 in each microbeam tube optical unit 2 is different. In embodiment 3, the optical fibers 1 in each micro-beam tube optical unit 2 are stacked in a multi-step manner, so that more optical fibers 1 can be accommodated in the micro-beam tube optical unit 2 with the same size, thereby further increasing the concentration of the inner cavity of the optical fibers and solving the problems of more and more tense pipeline laying resources and construction cost.
In this embodiment, for example, the external diameter of the sleeve of the microbeam tube optical unit 2 is 1.4mm, and the external diameter of the optical fiber is 180 μm.
The concentration of the optical fiber inner cavity of the 144-core rated breaking force overhead micro-beam optical cable is as follows
Shown in table 3.
| Number of cores | The concentration of the optical fiber inner cavity | Concentration of conventional aerial optical cable optical fiber inner cavity |
| 144 | 13.4 cores/mm 2 | 2.4 cores/mm 2 |
The manufacturing process of the 144-core rated breaking force overhead micro-beam optical cable in the embodiment comprises the following steps:
the first step is as follows: and (3) optical fiber treatment: performing color ring treatment on half optical fibers in 144 optical fibers, and then coloring all the optical fibers according to the color requirement;
the second step is that: manufacturing a microbeam tube light unit: grouping optical fibers, wherein each 24 optical fibers are grouped into one group, half of the grouped optical fibers are colorless ring optical fibers, and half of the grouped optical fibers are colored ring optical fibers, namely 12 colorless ring optical fibers and 12 colored ring optical fibers are arranged in each group, the optical fibers in each group are subjected to S or SZ twisting and then coated with fiber paste through a fiber paste heating device, and the optical fibers are subjected to extrusion molding to form 6 micro-beam tube optical units;
the third step: longitudinally wrapping the water blocking tape: s or SZ stranding is carried out on 6 micro-beam tube optical units, a high-expansion water-blocking yarn is added at the stranding center, and the stranded water-blocking yarn enters a water-blocking tape longitudinal wrapping device to finish longitudinal wrapping of the water-blocking tape;
the fourth step: and (3) extrusion molding: carry out the extrusion molding after indulging the package, the extrusion molding in-process carries out the sign through the color code that the quick-witted equipment of color strip adds the symmetry on the optical cable of extruding, and the extrusion molding product gets into the vacuum and stereotypes the basin simultaneously, accomplishes final shaping through the vacuum and stereotypes the basin.
The vacuum-setting water tank is described in example 1, and is not described in detail here.
In other embodiments, the optical fibers 1 in each of the optical units 2 of the microbeamformer are integrated into an optical fiber ribbon, and the coils are disposed in the microbeamformer to further increase the concentration of the optical fiber in the inner cavity.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A rated breaking force overhead micro-beam optical cable is characterized by comprising at least one micro-beam tube optical unit, wherein each micro-beam tube optical unit is provided with a plurality of optical fibers; the microbeam tube optical unit is sequentially wrapped with a water blocking tape and an outer sheath from inside to outside, two groups of reinforcing members are embedded in the outer sheath, the two groups of reinforcing members are spaced by 180 degrees along the circumferential direction of the outer sheath and extend in parallel along the length direction of the microbeam optical cable, the reinforcing members are arranged close to the water blocking tape in the outer sheath, and each group of reinforcing members comprises three copper-plated steel stranded wires; water-blocking yarns are arranged outside the micro-beam tube light units and in the water-blocking tapes;
the outer diameter of the micro-beam optical cable is 7.0 +/-0.1 mm, the total number of the optical fibers in the micro-beam optical cable is 72-144 cores, and the breaking force range is 1350N-2000N;
the tensile property of the micro-beam optical cable meets the following requirements: respectively applying 800N and 150N pulling forces to the micro-beam optical cable with the length not less than 25m for 10 minutes, and meeting the following conditions: the optical cable strain is less than 0.667% when the optical cable bears 800N; when the strain of the optical cable is born at 150N, the strain is less than 0.2 percent; residual strain after the pulling force is removed is less than 0.05 percent; the additional attenuation is less than 0.05dB; the microbeam optical cable is not damaged.
2. The overhead microbeam optical cable with rated breaking force as claimed in claim 1, wherein the thickness of the outer sheath is 1.4-1.6 mm, the outer diameter of the sleeve of the microbeam tube optical unit is 1.4-1.5mm, and the outer diameter of the optical fiber is not more than 200 μm.
3. The overhead microbeam optical cable of claim 1, wherein the total number of cores is 72 cores, and the concentration of the inner cavity of the optical cable is 6.7-7.2 cores/mm 2 Or the total core number is 96 cores, and the concentration of the inner cavity of the optical cable is 8.9-9.4 cores/mm 2 Or the total core number is 144 cores, and the concentration of the inner cavity of the optical cable is 13.4-13.9 cores/mm 2 。
4. A force-rated aerial microbeam optical cable as in claim 1, wherein there are a plurality of microbeam tube optical units, and the water-blocking yarns include 1 3000D expansion water-blocking yarn at a cable core of the microbeam optical cable, and expansion water-blocking yarns outside the cable core and twisted with the microbeam tube optical units.
5. The break force rated overhead microbeam cable of claim 1, wherein the outer jacket is made of High Density Polyethylene (HDPE).
6. The break force rated overhead microbeam optical cable according to claim 1, wherein the ac voltage resistance of the microbeam optical cable satisfies: the micro-bundle optical cable with the length of 5 +/-0.5 meters applies an alternating voltage with the maximum amplitude of 15kv and the frequency of 50hz between the reinforcing member of the micro-bundle optical cable and the ground, and the micro-bundle optical cable can maintain the time which is not punctured by the alternating voltage to be not less than 5min.
7. A break force rated overhead microbeam cable according to claim 1, which has an air tightness satisfying: one end of the micro-bundle optical cable is placed in a pressurizing chamber, the other end of the micro-bundle optical cable extends out of the pressurizing chamber, the pressurizing chamber is pressurized to 30kPa +/-3 kPa, a gas pressure detection point is selected on the micro-bundle optical cable, and the pressure of the gas pressure detection point is not changed after the micro-bundle optical cable is placed for 48 hours.
8. A process for manufacturing a break force rated overhead micro-beam optical cable according to any one of claims 1 to 7, comprising the steps of:
and (3) optical fiber treatment: performing color ring treatment on half of the optical fibers, and then coloring all the optical fibers;
manufacturing a microbeam tube light unit: grouping the optical fibers, wherein half of the optical fibers in each group are colorless ring optical fibers and half of the optical fibers in each group are colored ring optical fibers, and the optical fibers in each group are coated with fiber paste after being stranded and are formed into a micro-beam tube optical unit through extrusion molding;
longitudinally wrapping the water blocking tape: stranding the micro-beam tube optical units, adding water-blocking yarns in the stranding, and entering a water-blocking tape longitudinal wrapping device after the stranding to finish longitudinal wrapping of the water-blocking tape;
and (3) extrusion molding: carry out the extrusion molding after indulging the package, extrusion molding in-process extrusion molding product gets into the vacuum design basin, accomplishes final shaping through the vacuum design basin.
9. The manufacturing process according to claim 8, wherein the vacuum shaping water tank comprises a closed cooling water tank, the length of the cooling water tank is about 3m, a shaping copper pipe is arranged on one side of the cooling water tank, a sleeve outlet is correspondingly arranged on the other side of the cooling water tank in a coaxial line manner, and the dimensional error of the shaping copper pipe is not more than +/-0.02 mm.
10. The process of claim 8, wherein the extruded optical cable is marked by adding a symmetrical color mark.
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Inventor after: Zhou Hua Inventor after: Zhu Pengyu Inventor after: Miao Weiwei Inventor after: Tan Feng Inventor after: Zhao Jing Inventor after: Miao Xiaoming Inventor after: Qian Huihui Inventor after: Shen Huiyu Inventor before: Zhu Pengyu Inventor before: Zhou Hua Inventor before: Miao Weiwei Inventor before: Tan Feng Inventor before: Zhao Jing Inventor before: Miao Xiaoming Inventor before: Qian Huihui Inventor before: Shen Huiyu |