CN114675388A - Skeleton type optical fiber ribbon cable and preparation method thereof - Google Patents
Skeleton type optical fiber ribbon cable and preparation method thereof Download PDFInfo
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- CN114675388A CN114675388A CN202210589402.4A CN202210589402A CN114675388A CN 114675388 A CN114675388 A CN 114675388A CN 202210589402 A CN202210589402 A CN 202210589402A CN 114675388 A CN114675388 A CN 114675388A
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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
- G02B6/4403—Optical cables with ribbon structure
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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
- G02B6/4403—Optical cables with ribbon structure
- G02B6/4404—Multi-podded
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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
- G02B6/4407—Optical cables with internal fluted support member
- G02B6/4409—Optical cables with internal fluted support member for ribbons
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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
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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
- G02B6/448—Ribbon cables
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Abstract
The invention relates to a framework type ribbon optical cable and a preparation method thereof, the framework type ribbon optical cable comprises a cable core and a sheath layer coated outside the cable core, wherein the cable core comprises: the reinforcing part is arranged at the center of the framework, a plurality of flaky grooves extending along the axial direction are formed in the periphery of the framework, and the flaky grooves radially extend from the center of the framework to the periphery of the framework; the optical fiber ribbon is embedded in the flaky groove, only one optical fiber ribbon can be accommodated in one flaky groove, the plurality of optical fiber ribbons are radially arranged in the framework by taking the center of the framework as an axis along the extending direction of the flaky groove, and the width of the optical fiber ribbon is smaller than that of the flaky groove. According to the invention, the structure of the framework is improved, the extending arrangement direction of the framework grooves is changed, the optical fiber ribbons with wider widths can be accommodated in the framework grooves on the premise of ensuring that the framework can provide enough supporting force, and only one optical fiber ribbon is accommodated in one framework groove, so that the situation that the optical fiber ribbons are difficult to separate due to stacking arrangement is avoided.
Description
Technical Field
The invention relates to the technical field of optical cable structure design and preparation, in particular to a skeleton type ribbon optical cable and a preparation method thereof.
Background
With the rapid development of optical fiber communication industry and the sharp increase of information demand, the traditional optical cable with small core number has difficulty in meeting the actual communication requirement. The skeleton type optical fiber ribbon cable is concerned about due to the advantages of high optical fiber density, convenience in construction and installation and the like. The skeleton type optical fiber ribbon optical cable is developed and applied in metropolitan area networks and access networks. The framework type optical cable has the characteristics of small cable diameter, light weight, good bending property, strong lateral pressure resistance and the like.
Referring to fig. 1, in a conventional skeleton optical fiber ribbon cable, optical fiber ribbons are arranged in a U-shaped spiral skeleton groove or an SZ spiral skeleton groove in a matrix form, the cross section of the skeleton groove is in a rectangular structure, and a plurality of optical fiber ribbons are stacked and embedded in one skeleton groove, and the skeleton optical fiber ribbon cable with the structure has certain defects in the actual production and use processes:
in the production process, due to the limitation of the width of the framework groove, the optical fiber ribbons arranged in the framework grooves adopt a 24-core ribbon combining scheme at most, however, with the gradual maturity of the optical fiber ribbon combining technology, the 72-core ribbon combining technology can be completed in the prior art, and the modification of the scheme of expanding the width of the framework groove is easily conceived in order to open the optical fiber ribbons accommodating the 72 cores by adopting the prior framework;
in the use, because the multilayer optical fiber ribbon piles up and sets up in same skeleton groove, the optical fiber ribbon is formed through the solidification of ribbon resin, and under the service environment of high temperature, there is the slightly soluble condition in ribbon resin probably, and the optical fiber ribbon of multilayer ribbon is slightly soluble back easily glues together, the condition that appears being difficult to separate.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of the skeleton optical cable in the prior art, and provide a skeleton optical fiber ribbon and a preparation method thereof.
In order to solve the technical problem, the invention provides a framework type ribbon optical cable, which comprises a cable core and a sheath layer coated outside the cable core, wherein the cable core comprises:
the reinforcing part is arranged at the center of the framework, a plurality of flaky grooves extending along the axial direction are formed in the periphery of the framework, and the flaky grooves radially extend from the center of the framework to the periphery of the framework;
the optical fiber ribbon is embedded in the flaky groove, only one optical fiber ribbon can be accommodated in one flaky groove, the optical fiber ribbon is radially arranged in the framework by taking the center of the framework as an axis along the extending direction of the flaky groove, and the width of the optical fiber ribbon is smaller than the depth of the flaky groove.
In one embodiment of the invention, the sheet-shaped groove comprises an accommodating cavity, a first step cavity and a second step cavity, the accommodating cavity, the first step cavity and the second step cavity are sequentially arranged from the inside of the framework to the outside of the framework in a penetrating manner, the widths of the accommodating cavity, the first step cavity and the second step cavity are gradually increased, a first step surface and a second step surface are formed at the bottom of the first step cavity and the bottom of the second step cavity, the optical fiber ribbon is arranged in the accommodating cavity, and the outer portion of the optical fiber ribbon is higher than the first step surface and lower than the second step surface.
In one embodiment of the invention, a filling piece is further embedded in the second step cavity, the inner surface of the filling piece abuts against the second step surface, and the outer surface of the filling piece is flush with the outer surface of the framework to form a complete circular structure.
In one embodiment of the invention, the width of the accommodating cavity is between 0.5mm and 0.7 mm.
In one embodiment of the invention, the depth of the accommodating cavity is 0.4 mm-20.1 mm.
In one embodiment of the invention, a plurality of the sheet-shaped grooves are distributed in the framework at equal intervals in the circumferential direction.
In one embodiment of the invention, the optical fiber ribbon is formed by solidifying a plurality of optical fibers through a ribbon resin, and the optical fiber ribbon comprises 2-72 optical fibers.
In one embodiment of the invention, the skeleton is further coated with a water-resistant layer.
In one embodiment of the invention, the sheath layer is prepared from low-smoke halogen-free flame retardant.
In order to solve the technical problem, the invention provides a method for preparing a skeleton type optical fiber ribbon cable, which is used for preparing the skeleton type optical fiber ribbon cable and comprises the following steps:
s1, coloring the optical fiber;
s2, preparing an optical fiber ribbon, and sequentially connecting a plurality of colored optical fibers in parallel by adopting parallel-band resin under the curing action of a UV lamp tube according to the arrangement mode of a pilot color spectrum or a full color spectrum;
s3, arranging the framework at the center, arranging a plurality of optical fiber ribbons around the framework, and synchronously embedding the optical fiber ribbons into different sheet-shaped grooves in the framework to form a cable core;
and S4, extruding and molding a sheath layer outside the cable core.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the framework type ribbon optical cable changes the structure and the distribution condition of the framework grooves in the existing framework optical cable, adopts the framework with the flaky grooves, and the direction of the flaky grooves is set to extend from the center position of the framework to the periphery of the framework, so that the width of the framework grooves for containing optical fibers is changed, the width direction of the framework grooves is set on the diameter of the framework, and wider optical fiber ribbons can be contained;
specifically, in the prior art, due to the limitation of the width of the framework groove, the optical fiber ribbon arranged in the framework groove adopts a 24-core ribbon combining scheme at most, however, with the gradual maturity of the optical fiber ribbon combining technology, the existing ribbon combining technology can already complete 72-core ribbon combining, and then more optical fibers can be combined, and the existing framework is adopted to open the optical fiber ribbon containing 72 cores, so that the scheme of expanding the width of the framework groove is easy to be conceived to be modified, however, if the width of the framework groove is expanded, the concave surface of the framework groove is expanded, external pressure is easy to be applied to the framework groove, the optical fibers in the framework groove are easy to be extruded, and the width of the framework groove is correspondingly increased, so that the diameter of the framework is further required to ensure the overall supporting force of the framework;
therefore, the arrangement mode of the framework grooves and the arrangement mode of the optical fiber ribbons embedded into the framework grooves in the prior art are changed, the length of the radius of the framework is taken as the width capable of accommodating the optical fiber ribbons, and the optical fiber ribbons are oppositely arranged in the radial extending direction of the framework, so that the optical fiber ribbons with 72 cores and more than 72 cores can be accommodated; the optical fiber ribbons are arranged in the sheet-shaped groove, so that the situation that the stacked optical fiber ribbons are difficult to separate can be prevented, and the width of the sheet-shaped groove is small due to the small thickness of the optical fiber ribbons, the opening width of the sheet-shaped groove can be reduced, the optical fiber ribbons are not easily directly extruded when the optical cable is subjected to lateral pressure, and the overall lateral pressure resistance of the optical cable is improved;
meanwhile, the width of the optical fiber ribbon is controlled to be smaller than the depth of the flaky groove, so that the optical fiber ribbon is completely embedded into the flaky groove, and the optical fiber ribbon cannot be damaged even if the side surface of the flaky groove is extruded;
the invention also considers the possible problems in the practical application, if the optical fiber ribbon is completely embedded into the sheet-shaped groove, the optical fiber ribbon is difficult to take out under the condition of actually stripping the cable and opening the skylight, therefore, the sheet-shaped groove provided by the invention also comprises an accommodating cavity, a first step cavity and a second step cavity, the widths of the accommodating cavity, the first step cavity and the second step cavity are gradually increased, one end of the optical fiber ribbon is arranged to protrude out of the accommodating cavity, so that a certain space is reserved in the first step cavity on two sides of the part protruding out of the accommodating cavity, and in the practical operation, a tool can be inserted into two sides of the optical fiber ribbon, thereby realizing the clamping of the optical fiber ribbon and facilitating the taking out of the optical fiber ribbon from the accommodating cavity; and, still need consider to protect outstanding ribbon outside the holding chamber, if direct injection moulding restrictive coating outside first step chamber, so when the restrictive coating receives the extrusion, it is sunken to extrude the restrictive coating very easily, thereby make restrictive coating and outstanding fiber optic ribbon contact, cause the damage of ribbon, for this reason, set up the second step chamber that is wider in first step chamber outside first step chamber, thereby make and reserve between restrictive coating and the ribbon and have certain space, even the restrictive coating receives the extrusion and leads to the restrictive coating sunken, separation through second step chamber, also can not make restrictive coating and ribbon direct contact.
The invention also provides a preparation method of the skeleton type ribbon optical cable, which can realize the preparation of the skeleton type ribbon optical cable.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a conventional skeletal ribbon cable of the prior art;
FIG. 2 is a schematic structural view of embodiment 1 of the skeletal ribbon cable of the present invention;
FIG. 3 is a schematic structural view of embodiment 2 of the skeletal ribbon cable of the present invention;
FIG. 4 is a schematic structural view of embodiment 3 of the skeletal ribbon cable of the present invention;
FIG. 5 is a flow chart of the steps of a method of making a skeletal ribbon cable of the present invention.
The specification reference numbers indicate: 1. a framework; 11. a reinforcement; 12. a sheet-like groove; 121. an accommodating cavity; 122. a first step cavity; 123. a second step cavity; 13. a filling member; 2. an optical fiber ribbon; 3. a water blocking tape; 4. a sheath layer.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example 1
Referring to fig. 2, the framework type ribbon optical cable of the embodiment includes a cable core and a sheath layer 4 coated outside the cable core, the cross section of the cable core is a circular structure, the cross section of the sheath layer 4 is a circular ring structure concentrically arranged with the cable core, the cable core includes a framework 1 and an optical fiber ribbon 2, and the specific assembling mode is as follows: embedding an optical fiber ribbon 2 in the framework 1, wherein the optical fiber ribbon 2 is used as a communication unit to realize transmission of optical signals, the framework 1 is used as a supporting unit to effectively protect the optical fiber ribbon 2, and the framework 1 also needs to meet certain mechanical properties of tensile strength, lateral pressure resistance and bending resistance in the actual use process;
specifically, in order to design the framework 1 to have the above performance, the framework 1 should have a structure including a reinforcing member 11 capable of resisting tension and bending and a groove for accommodating and protecting the optical fiber ribbon 2, in this embodiment, the reinforcing member 11 is disposed at a central position of the framework 1, a plurality of grooves are formed at an outer periphery of the framework 1, the plurality of grooves are the same in size and shape and are all sheet-shaped grooves 12 extending along an axial direction, the plurality of sheet-shaped grooves 12 extend radially from the central position of the framework 1 to the outer periphery of the framework 1, and the plurality of sheet-shaped grooves 12 form a channel for accommodating the optical fiber ribbon 2 from inside to outside along a radial direction of the framework 1;
the framework type ribbon optical cable of the embodiment changes the structure and distribution condition of framework grooves in the existing framework optical cable, adopts a framework 1 with a sheet-shaped groove 12, and the direction of the sheet-shaped groove 12 is set to extend from the center position of the framework 1 to the periphery of the framework 1, so as to change the width of the framework groove for accommodating optical fibers, so that the width direction of the framework groove is set on the diameter of the framework 1, that is, the optical fiber ribbon 2 can be set along the extending direction of the diameter of the framework 1, theoretically, the maximum width of the optical fiber ribbon 2 can be set to be the same as the radius of the framework 1, so as to accommodate a wider optical fiber ribbon 2;
specifically, the optical fiber ribbons 2 are embedded in the sheet-shaped grooves 12, only one optical fiber ribbon 2 can be accommodated in one sheet-shaped groove 12, and a plurality of optical fiber ribbons 2 are radially arranged in the framework 1 along the extending direction of the sheet-shaped grooves 12 by taking the center of the framework 1 as an axis;
specifically, the width of the optical fiber ribbon 2 is set to be smaller than the depth of the sheet-shaped groove 12, in this embodiment, the depth of the sheet-shaped groove 12 is the length extending from the bottom surface of the sheet-shaped groove 12 to the opening of the sheet-shaped groove 12, so that the optical fiber ribbon 2 can be completely embedded into the sheet-shaped groove 12, which can further protect the optical fiber ribbon 2, and even when the side surface of the sheet-shaped groove 12 is squeezed, the optical fiber ribbon 2 cannot be damaged.
Specifically, the width and depth of the sheet-like groove 12 in the present embodiment are set according to the width and height of the optical fiber ribbon 2 after ribbon merging, and referring to table 1, a comparison table of the width and depth of the sheet-like groove 12 is correspondingly set according to the number of cores of the optical fiber ribbon 2:
TABLE 1 (unit mm)
In this embodiment, optical fiber ribbon 2 is formed by many optic fibre through and take the resin solidification, optical fiber ribbon 2 includes 2 ~ 72 optic fibre, refer to table 1, the width and the thickness after the optical fiber ribbon 2 of different core numbers takes are different, in order to be able to imbed optical fiber ribbon 2 into slice recess 12, the width that sets up slice recess 12 is between 0.5mm ~ 0.7mm, guarantee that the width of slice recess 12 is greater than the thickness of an optical fiber ribbon 2, be less than two optical fiber ribbon 2's thickness can, the degree of depth that sets up slice recess 12 is between 0.8mm ~ 20.5mm, guarantee that the degree of depth that sets up slice recess 12 is greater than the width of optical fiber ribbon 2, guarantee that optical fiber ribbon 2 can imbed completely into slice recess 12.
Example 2
In the actual using process, it is found that there is a certain defect in the above embodiment 1, when the optical cable needs to be spliced, the optical cable needs to be skylight-opened, after the skylight is opened in the above embodiment 1, because the opening of the sheet-shaped groove 12 is narrow, it is difficult to take out the optical fiber ribbon 2 from the sheet-shaped groove 12, for this reason, the embodiment 2 is improved on the basis of the above embodiment 1, and details of the same structure are omitted:
specifically, in the present embodiment, the sheet-shaped groove 12 is modified, the sheet-shaped groove 12 is provided to be a sectional structure, as shown in fig. 3, the sheet-shaped groove 12 includes an accommodating cavity 121, a first step cavity 122 and a second step cavity 123, and the accommodating cavity 121, the first step cavity 122 and the second step cavity 123 are sequentially arranged from inside of the framework 1 to outside of the framework 1 in a through manner; the cross section of the accommodating cavity 121 is rectangular, and one optical fiber ribbon 2 can be placed in the accommodating cavity 121; the first stepped cavity 122 is arranged outside the accommodating cavity 121, the cross section of the first stepped cavity 122 is in a sector shape, the inner side of the first stepped cavity 122 is communicated with the accommodating cavity 121 and coaxially arranged with the accommodating cavity 121, the width of the inner side of the first stepped cavity 122 is greater than that of the accommodating cavity 121, and a first stepped surface is formed at the joint of the first stepped cavity 122 and the accommodating cavity 121; the second step cavity 123 is arranged outside the first step cavity 122, the cross section of the second step cavity 123 is fan-shaped, the inner side of the second step cavity 123 is communicated with the first step cavity 122 and coaxially arranged with the first step cavity 122, the width of the inner side of the second step cavity 123 is larger than the width of the outer side of the first step cavity 122, a second step surface is formed at the joint of the second step cavity 123 and the first step cavity 122, the optical fiber ribbon 2 is inserted into the accommodating cavity 121 through the second step cavity 123 and the first step cavity 122 in sequence, the inner part of the optical fiber ribbon 2 abuts against the bottom of the accommodating cavity 121, the outer part of the optical fiber ribbon 2 protrudes out of the accommodating cavity 121, and the part protruding out of the accommodating cavity 121 is higher than the first step surface and lower than the second step surface.
In this embodiment, a first stepped cavity 122 wider than the accommodating cavity 121 is disposed outside the accommodating cavity 121, and one end of the optical fiber ribbon 2 is disposed to protrude from the accommodating cavity 121, so that a certain space is reserved in the first stepped cavity 122 on two sides of a portion protruding from the accommodating cavity 121, and in actual operation, a tool can be inserted into two sides of the optical fiber ribbon 2, so as to clamp the optical fiber ribbon 2, and the optical fiber ribbon 2 is conveniently taken out from the accommodating cavity 121; and, in the technical scheme of this embodiment, need consider and protect outstanding 2 fiber ribbons outside holding chamber 121, if direct injection moulding restrictive coating 4 outside first step chamber 122, then when restrictive coating 4 receives the extrusion, it is sunken to extrude restrictive coating 4 very easily to make restrictive coating 4 and outstanding 2 contact of fiber ribbon, cause the damage of fiber ribbon 2, for this, first step chamber 122 sets up the second step chamber 123 that is wider in first step chamber 122 outward, thereby make and reserve certain space between restrictive coating 4 and the fiber ribbon 2, even restrictive coating 4 receives the extrusion and leads to restrictive coating 4 sunken, through the separation of second step face, also can not make restrictive coating 4 and 2 direct contact of fiber ribbon.
Specifically, the width and depth of the accommodating cavity 121 in this embodiment are set according to the width and height of the optical fiber ribbon 2 after ribbon merging, and referring to table 2, a comparison table of the width and depth of the accommodating cavity 121 is correspondingly set according to the number of cores of the optical fiber ribbon 2:
TABLE 2 (unit mm)
In the embodiment, the optical fiber ribbon 2 is formed by solidifying a plurality of optical fibers through a ribbon resin, the optical fiber ribbon 2 comprises 2 to 72 optical fibers, referring to table 2, the optical fiber ribbons 2 with different core numbers have different widths and thicknesses after being stacked, in order to embed the optical fiber ribbon 2 into the accommodating cavity 121 and protrude out of the accommodating cavity 121, the width of the accommodating cavity 121 is set to be between 0.5mm and 0.7mm, so as to ensure that the width of the accommodating cavity 121 is larger than the thickness of one optical fiber ribbon 2 and smaller than the thickness of two optical fiber ribbons 2, the depth of the accommodating cavity 121 is set to be between 0.4mm and 20.1mm, so as to ensure that a part of the optical fiber ribbons 2 can protrude out of the accommodating cavity 121, in the embodiment, the length of the optical fiber ribbons 2 protruding out of the accommodating cavity 121 is 0.3mm, therefore, the depth of the first step cavity 122 and the second step cavity 123 is set to be 0.5mm and larger than 0.3mm, so that the portion of the optical fiber ribbon 2 protruding out of the accommodating cavity 121 is higher than the first step surface and lower than the second step surface.
Example 3
In the technical scheme of embodiment 2 above, the second stepped cavity 123 still has a certain opening to the outside, on one hand, the roundness of the cable core is affected, and when the sheath layer 4 is injection-molded, the sheath layer 4 at the opening is easy to collapse, and on the other hand, when the sheath layer 4 at the opening is also easy to deform by extrusion when the sheath layer is laterally extruded, in order to further perfect the technical scheme of embodiment 2, this embodiment 3 is improved on the basis of the above embodiment 2, and the parts with the same structure are not described again:
referring to fig. 4, in this embodiment, a filler 13 is further embedded in the second step cavity 123, the filler 13 is of a profiling structure, the shape of the filler 13 is the same as that of the second step cavity 123, the inner surface of the filler 13 abuts against the second step surface, and the outer surface of the filler 13 is flush with the outer surface of the framework 1, so that the whole framework 1 forms a complete circular structure, the roundness of the whole cable core is ensured, the situation of injection molding material collapse cannot occur in the injection molding process, and when the whole framework 1 is subjected to side extrusion, external pressure is applied to the filler 13, the filler 13 is pressed against the second step surface, and external pressure can be prevented from being transmitted to the optical fiber ribbon 2.
Referring to fig. 2 to 4, in order to ensure the symmetry of the whole cable core and simultaneously ensure the reasonableness of the distribution of the optical fiber ribbon 2, in the above embodiments 1 to 3, a plurality of the sheet-shaped grooves 12 are distributed in the framework 1 at equal intervals in the circumferential direction, so that the sheet-shaped grooves 12 can be arranged as much as possible around the center of the framework 1, the volume fraction of the optical fibers in the framework 1 is further improved, and the bearing capacity of the framework 1 is ensured to be the same when any angle of the circumferential surface of the cable core is stressed.
Specifically, moisture factors may affect the transmission efficiency and the service life of the optical fiber, and therefore, a certain water blocking measure needs to be adopted in the optical cable when the optical fiber needs to be arranged in a relatively dry environment, as shown in fig. 2 to 4, in order to further improve the water blocking performance of the optical cable, a water blocking layer is coated outside the framework 1 in the above embodiments 1 to 3, the water blocking layer is a water blocking tape 3, and the water blocking tape 3 can have a water absorbing effect and keep the environment outside the optical fiber relatively dry on one hand, and on the other hand, the water blocking tape 3 has a water absorbing expansion characteristic and can also have a water blocking and isolating effect after expansion;
specifically, the winding mode of the water-blocking tape 3 outside the cable core has two types:
1. longitudinally wrapping the water-blocking tape 3, and ensuring that the lapping edge position of the longitudinally wrapped water-blocking tape 3 is at the same position relative to the cable core, and has certain requirements on the width of the selected water-blocking tape 3: the lap width of the water-blocking tape 3 is ensured to be more than 5 mm.
2. And (3) winding the water-blocking tape 3, taking the cable core as an axis, and spirally winding the water-blocking tape 3 outside the cable core, wherein the winding overlapping rate of the water-blocking tape 3 is required to be ensured to be 25% -45%.
Specifically, the sheath layers 4 in the embodiments 1 to 3 are all prepared from low-smoke halogen-free flame retardant, and the sheath layers 4 have the performances of ultraviolet resistance, water resistance, mildew resistance and environmental stress cracking resistance; and no acid gas is released, the equipment in a machine room is not corroded, and the flame-retardant cable is suitable for being used in an indoor environment with high flame-retardant grade.
Example 4
Referring to fig. 5, the present invention further provides a method for preparing the skeletal ribbon cables of embodiments 1 to 3, including the following steps:
s1, coloring the optical fiber, wherein the optical fiber is colorless and transparent after being prepared by drawing, but in the actual use process, in order to distinguish the optical fiber, the optical fiber needs to be colored, the bare optical fiber is sprayed by coloring ink, and the coloring ink is cured under the irradiation of a UV lamp;
s2, preparing an optical fiber ribbon 2, arranging a plurality of colored optical fibers according to a pilot color spectrum or full color spectrum arrangement mode, and sequentially connecting the colored optical fibers in a ribbon-combined manner by adopting ribbon-combined resin under the curing action of a UV lamp tube;
specifically, the optical fiber ribbon 2 with 12 cores inside is prepared, the preparation is completed by one-time ribbon combination, and the arrangement sequence of the optical fibers can be arranged according to a pilot chromatogram: for example, a chromatographic arrangement of blue, white, blue, white may be used, or a full chromatographic arrangement may be used: adopting blue, orange, green, brown, gray, white, red, black, yellow, purple, pink and turquoise color spectrum arrangement; when preparing the optical fiber ribbon 2 with more than 12 cores, secondary ribbon combination or multiple ribbon combination treatment is needed, and different pilot color spectrum arrangements can be adopted: for example, the optical fiber ribbon 2 using 12-core ribbons of blue, white, blue, and white may be combined with the optical fiber ribbon 2 using 12-core ribbons of orange, white, or may be arranged in a full color spectrum of different numbers, and serial numbers may be printed on the optical fiber ribbon 2.
S3, preparing a cable core;
s3-1, arranging a framework 1 at a central position, arranging a plurality of optical fiber ribbons 2 around the framework 1, arranging the optical fiber ribbons 2 on a pay-off rack of a cage stranding machine, and synchronously embedding the optical fiber ribbons 2 into different sheet-shaped grooves 12 in the framework 1;
s3-2, preparing filling pieces 13 with the same shape as the second step cavities 123 in the framework 1, and synchronously embedding a plurality of filling pieces 13 into different second step cavities 123 in the framework 1 to form a cable core;
s3-3, wrapping or longitudinally wrapping the waterproof tape 3 outside the cable core to form a waterproof layer;
s4, preparing a sheath layer 4, preparing the sheath layer 4 by using an extruded tube mold, wherein the injection molding material is low-smoke halogen-free flame retardant, and is molded into a tubular structure under the extrusion molding action of the extruded tube mold to be coated on the periphery of the cable core.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. The utility model provides a framework ribbon optical cable, includes cable core and the restrictive coating of cladding outside the cable core, its characterized in that, the cable core includes:
the reinforcing part is arranged at the center of the framework, a plurality of flaky grooves extending along the axial direction are formed in the periphery of the framework, and the flaky grooves radially extend from the center of the framework to the periphery of the framework;
the optical fiber ribbons are embedded in the flaky grooves, only one optical fiber ribbon can be accommodated in one flaky groove, the optical fiber ribbons are radially arranged in the framework along the extension direction of the flaky grooves by taking the center of the framework as an axis, and the width of the optical fiber ribbon is smaller than the depth of the flaky groove;
the slice recess includes holding chamber, first step chamber and second step chamber, holding chamber, first step chamber and second step chamber link up the setting from the skeleton in proper order to the skeleton outward, the width grow gradually in holding chamber, first step chamber and second step chamber the bottom in first step chamber and second step chamber forms first step face and second step face, the optical fiber ribbon sets up in the holding chamber, the outside of optical fiber ribbon is higher than first step face and is less than the second step face.
2. The skeletal ribbon cable of claim 1, wherein: and a filling piece is further embedded in the second step cavity, the inner surface of the filling piece abuts against the second step surface, and the outer surface of the filling piece is flush with the outer surface of the framework to form a complete circular structure.
3. The skeletal ribbon cable of claim 1, wherein: the width of the accommodating cavity is 0.5 mm-0.7 mm.
4. The skeletal ribbon cable of claim 1, wherein: the depth of the accommodating cavity is 0.4 mm-20.1 mm.
5. The skeletal ribbon cable of claim 1, wherein: the plurality of sheet-shaped grooves are distributed in the framework at equal intervals in the circumferential direction.
6. The skeletal ribbon cable of claim 1, wherein: the optical fiber ribbon is formed by solidifying a plurality of optical fibers through ribbon resin and comprises 2-72 optical fibers.
7. The skeletal ribbon cable of claim 1, wherein: and a water-resistant layer is coated outside the framework.
8. The skeletal ribbon cable of claim 1, wherein: the sheath layer is prepared from low-smoke halogen-free flame retardant.
9. A preparation method of a skeleton type ribbon cable is characterized by comprising the following steps: a skeletal ribbon cable for use in making any of the above claims 1-8, comprising the steps of:
s1, coloring the optical fiber;
s2, preparing an optical fiber ribbon, and sequentially connecting a plurality of colored optical fibers in parallel by adopting parallel-band resin under the curing action of a UV lamp tube according to the arrangement mode of a pilot color spectrum or a full color spectrum;
s3, arranging the framework at the center, arranging a plurality of optical fiber ribbons around the framework, and synchronously embedding the optical fiber ribbons into different sheet-shaped grooves in the framework to form a cable core;
and S4, extruding and molding a sheath layer outside the cable core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN114675388B (en) | 2022-12-27 |
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