CN113433634B - Remote optical cable and preparation method thereof - Google Patents
Remote optical cable and preparation method thereof Download PDFInfo
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- CN113433634B CN113433634B CN202110497164.XA CN202110497164A CN113433634B CN 113433634 B CN113433634 B CN 113433634B CN 202110497164 A CN202110497164 A CN 202110497164A CN 113433634 B CN113433634 B CN 113433634B
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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
- G02B6/4415—Cables for special applications
- G02B6/4427—Pressure resistant cables, e.g. undersea cables
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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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
- G02B6/4486—Protective covering
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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
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
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- Laying Of Electric Cables Or Lines Outside (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention provides a remote optical cable and a preparation method thereof, wherein the remote optical cable comprises a positioning framework positioned in the center of the cable, supporting frameworks are symmetrically and respectively arranged along four corners of the positioning framework, a circular groove is formed between the positioning framework and each supporting framework, and a sub-cable is placed in the circular groove to form a cable core; the cable core is externally extruded with an inner sheath, the inner sheath is externally woven with an aramid yarn woven layer, and the aramid yarn woven layer is externally extruded with an outer sheath; the inner sheath, the aramid yarn woven layer and the outer sheath are integrally formed. The invention adopts a framework supporting form, improves the roundness of the product, and avoids the phenomena of large attenuation and even fiber breakage caused by adhesion; the invention is effective optimization under the premise of ensuring the original characteristics of light weight, small bending radius, full medium and the like of the product, and is increased and optimized in the aspects of tensile resistance, water resistance, rat bite prevention, impact resistance and pressure resistance respectively so as to improve the laying range and comprehensive laying capacity of the product.
Description
Technical Field
The invention relates to the field of communication cables, in particular to a remote optical cable and a preparation method thereof.
Background
In recent years, with the rapid development of a 5G network and the application of big data and artificial intelligence, the construction of base stations enters the blowout type development, various base stations are densely distributed, and the remote optical cable is widely applied due to the characteristics of light weight, small bending radius and all media, but with the increasing complexity of the laying environment, particularly the construction near hills, forests and lakes, the existing product has defects in the characteristics of tensile resistance, water resistance, rat bite resistance, impact resistance and the like, so that a remote optical cable for comprehensive wiring is urgently needed.
Disclosure of Invention
The invention provides a remote optical cable for solving the existing problems, which not only improves the tensile property and the compressive property of a product, but also improves the rat bite resistance and the impact resistance.
The invention also provides a preparation method of the remote optical cable.
The remote optical cable comprises a positioning framework positioned in the center of the cable, wherein supporting frameworks are symmetrically and respectively arranged along four corners of the positioning framework, a circular groove is formed between each positioning framework and each supporting framework, and a sub-cable is placed in each circular groove to form a cable core; the cable core is externally extruded with an inner sheath, the inner sheath is externally woven with an aramid yarn woven layer, and the aramid yarn woven layer is externally extruded with an outer sheath; the inner sheath, the aramid yarn weaving layer and the outer sheath are integrally formed.
Further improve, the sub-cable including being located the optical fiber unit at sub-cable center, wrap up sub-cable sheath behind many aramid yarn of evenly distributed outside the optical fiber unit, sub-cable sheath and many aramid yarn between be equipped with powder type water-blocking material, the material specifically is: the material adopted by the crosslinked polyacrylic acid expansion material is in a solid state, the particle diameters of the material are all 0.5-0.8 mm, the polymer contains a large amount of hydrophilic genes, the polymer can be rapidly opened when meeting water, and the fine and uniform volume can be scattered in various gaps, so that the aim of actively blocking water is fulfilled.
Further improve, the location skeleton in be equipped with many sacks and block water material, outer bag membrane is solid-state high temperature resistant to meet water and melts promptly, and the parcel has liquid block water material in the bag membrane, meets water inflation, and the space is filled up to thick form, solves deep water, vertical watertight requirement, and the four sides of location skeleton are the arc.
The improved cable support structure is characterized in that a framework groove is formed in the support framework, a strip framework and a plurality of water blocking yarns distributed at two ends of the strip framework are arranged in the framework groove, two edges of the support framework, which are in contact with the sub-cables, are arc-shaped, the design of the support framework avoids the occurrence of adhesion, the hidden danger of abnormal attenuation and even fiber breakage after the sub-cables are adhered is solved, and meanwhile, the roundness and the pressure resistance of a product are improved.
In a further improvement, the optical fiber unit comprises a nylon tight-buffered optical fiber and a glass yarn layer wrapped outside the nylon tight-buffered optical fiber.
In a further improvement, the same spacing exists between the second supporting frameworks, and the spacing is smaller than 1/22 of the circumference of the cable core.
Further improved, the distance between the strip frameworks is smaller than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the supporting framework and the strip-shaped framework is 1:4:4 for the sheath (the sheath is an integral structure formed by integrally forming the inner sheath, the aramid yarn woven layer and the outer sheath); therefore, when the optical cable generates 1/8 deformation, the second supporting framework completes 360-degree annular support, and meanwhile, the strip-shaped framework also completes 360-degree annular support, so that the influence of pressure and impact on optical fibers in the sub-cables is reduced, and the compression resistance and impact resistance of the product are improved; meanwhile, due to the design of gaps among the strip-shaped frameworks, the bending resistance of the product is ensured.
The further improvement is that the circumference calculation formula of the supporting framework is as follows
When the 1/8 deformation is generated in the cable,
d a to support the perimeter formed by the skeleton after being stressed, d c Is the circumference of the cable core, d f To support the perimeter of the skeleton.
Further improve, added aramid yarn weaving layer between inlayer sheath and outer sheath, weave density and be greater than 99.5%, weaving layer clearance is less than 0.1mm, and aramid yarn's tensile strength needs to be greater than 3500Mpa to guarantee at the occlusal force: 110N, 20 times/minute of occlusion frequency and 10000 times of occlusion frequency, the sheath of the remote optical cable is not punctured.
The improvement is further realized, the inner layer sheath, the outer layer sheath and the aramid yarn weaving layer are integrally formed, so that the inner layer sheath, the outer layer sheath and the aramid yarn weaving layer form a whole, the aramid yarn weaving layer surrounded by 360 degrees completely releases the tensile strength of aramid, and the problems of uneven tension of each element, overlarge tension, stress bending of the retracted cable core and unstable structure are solved; the inner layer and the outer layer of the sheath are separated, so that the inner layer of the sub-cable is prevented from being exposed after the mouse bites the sub-cable. Meanwhile, the roundness, compression resistance and impact resistance of the product are improved.
A preparation method of a remote optical cable comprises the following steps:
1) preparing a sub cable: the nylon tight-buffered optical fiber is discharged straightly, and the paying-off tension of the nylon tight-buffered optical fiber is 80 g; a plurality of glass yarns are wound and paid off by taking nylon tight-buffered optical fibers as the center, the nylon tight-buffered optical fibers are completely wrapped, a plurality of aramid fibers are flatly and straightly arranged on the periphery of the wrapped glass yarns, meanwhile, powder type water-resistant materials are randomly scattered on the aramid yarns, the glass yarns and the nylon tight-buffered optical fibers through a powder type water-resistant material device, then, a sub-cable sheath is extruded by a head of an extruding machine, and after cooling, the sub-cable is collected on a turnover disc;
2) preparing a positioning framework: adopting an extrusion molding forming process, adopting an extrusion process for a mold core and a mold sleeve, wherein the mold sleeve is of a special-shaped structure, 4 conduits are added in the mold core, after the installation is finished, the conduit of the mold core is in a state of being flush with the opening of the mold sleeve, an extrusion molding material enters a gap between the mold core and the mold sleeve through an extrusion molding machine head, the extrusion molding material is extruded into a positioning framework through the mold sleeve, a saccular water-blocking material is placed in a saccular water-blocking material placing area, the saccular water-blocking material is uniformly conveyed to the conduits of the mold core through a conveying pipeline through a pressurizing conveying device, and the saccular water-blocking material in the conduits is conveyed to corresponding holes in the positioning framework through the pressurizing conveying device;
3) preparing a supporting framework: firstly, adopting an extrusion mode, enabling an extrusion molding material to enter a gap between a mold core and a mold sleeve through an extrusion molding machine head, extruding the extrusion molding material into a strip-shaped framework through the mold sleeve, and fully cooling the extrusion molding material after the extrusion molding so as to be capable of being stored on a disc; two kinds of different materials are selected to strip skeleton and support skeleton, avoid the extrusion molding in-process to produce the adhesion phenomenon, adopt the crowded pipe mode during the support skeleton extrusion molding: the mold core and the mold sleeve are designed in a curved shape, the mold core needs to protrude out of a mold sleeve opening during assembly, the mold core opening protrudes out of the mold sleeve opening after assembly by adopting a pipe extruding mode, a corresponding framework groove can be formed after extrusion molding, and a strip-shaped framework and water blocking yarns are distributed in the framework groove uniformly after molding by adopting an active pay-off mode during extrusion molding;
the same interval exists between every two support frameworks, and the interval is smaller than 1/22 of the circumference of the cable core; the distance between the strip-shaped frameworks is smaller than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the three layers of integrally formed sheaths, the supporting framework and the strip-shaped framework is 1:4: 4; therefore, when the optical cable generates 1/8 deformation, the supporting framework completes 360-degree annular support, and meanwhile, the strip-shaped framework also completes 360-degree annular support;
the circumference of the supporting framework is measured
By the formula, when 1/8 deformation is generated in the optical cable,
d a to support the perimeter formed by the skeleton after being stressed, d c Is the circumference of the cable core, d f To support the perimeter of the skeleton.
4) Paying off the positioning framework in the step 2), the supporting framework in the step 3) and the plurality of sub-cables in the step 1) in a stranding mode, and then carrying out simultaneous extrusion molding on the inner layer, the outer layer and the aramid woven layer in a double-layer co-extrusion mode through a double-connection machine head to realize the production of the remote optical cable.
Further improve, the doubly-linked aircraft nose in step 4) divide into inlayer sheath extrusion molding aircraft nose and outer sheath extrusion molding aircraft nose, and inlayer sheath extrusion molding aircraft nose is only 1/3 of outer sheath extrusion molding aircraft nose, and both connect through sheath material conveying runner to inlayer sheath extrusion aircraft nose still is equipped with heat-proof device and direction magnetic ring outward, has solved 360 after weaving and has encircleed aramid yarn weaving layers and how to place in sheath inlayer and sheath skin simultaneous production with this.
Further improvement, an active pay-off device is added in the step 4) and used for placing a positioning framework between the symmetrical sub-cables, and a positioning device for preventing the positioning framework from twisting is arranged at an outlet of the double wheels; a plurality of sub-cables are all paid off by adopting a twisting cage, the twisting cage adopts a back-twisting mode, a supporting framework between the sub-cables and the inner sheath is also released from the twisting cage, a correcting and positioning die is arranged in front of a twisting table to ensure the roundness after twisting and the accurate falling position of the supporting framework, the distance between the twisting table and an inner sheath extrusion molding device is required to be less than 15cm, a twisted cable core within 15cm is not easy to scatter, and if the length is too large, the twisting form is easy to deform and misplace; outer sheath extrusion molding aircraft nose passes to the sheath material to the inlayer sheath extrusion molding aircraft nose through 4 runners in, simultaneously need draw heat-proof device to fixed position when production, when the extrusion molding of inlayer sheath, aramid yarn weaving device is weaving in step, control aramid yarn's size, the radical, weave the node utensil, weave the diameter, guarantee to weave density and be greater than 99.5%, the weaving layer clearance is less than 0.1mm, aramid yarn weaves and wraps up in the direct mold core that gets into outer sheath extrusion molding device of uncooled inlayer sheath, carry out sheath extrusion through extrusion mode and assisting with pressure evacuation, cool off through the cooling water behind the extrusion, and receive the optical cable of drawing far that cools off on the dish utensil.
The invention has the beneficial effects that:
the remote optical cable adopts a framework supporting mode, improves the roundness of a product, and avoids the phenomena of large attenuation and even fiber breakage caused by adhesion; the design of the annular framework supports and the framework grooves ensures that 2 annular supports are formed when a product is subjected to external force, thereby improving the compression resistance and the impact resistance of the product and improving the environment adaptation capability of the product; the design of the aramid braid layer and the rat-bite-preventing sheath material improves the rat-bite-preventing performance and tensile property of the product; the design is effectively optimized on the premise of ensuring the original characteristics of light weight, small bending radius, full medium and the like of the product, and the design is respectively increased and optimized in the aspects of tensile resistance, water resistance, rat bite resistance, impact resistance and pressure resistance so as to improve the laying range and comprehensive laying capacity of the product.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a process diagram for preparing a positioning frame according to the present invention;
fig. 3 is a process diagram of the simultaneous extrusion and integral formation of the inner layer sheath, the outer layer sheath and the aramid woven layer.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, the invention is a remote optical cable, which comprises a positioning framework 14 positioned at the center of the cable, supporting frameworks 9 are symmetrically arranged along four corners of the positioning framework respectively, a circular groove is formed between the positioning framework and each supporting framework, and a sub-cable is placed in the circular groove to form a cable core; an inner sheath 1 is extruded outside the cable core, an aramid yarn braided layer 12 is woven outside the inner sheath, and an outer sheath 13 is extruded outside the aramid yarn braided layer; inner sheath, aramid yarn weaving layer and oversheath integrated into one piece, the sheath material has the protection against rodents and stings the characteristic, and the aramid weaving layer is 360 not only improving the tensile properties and the compressive property of product for encircleing, has improved protection against rodents simultaneously and has stings characteristic and impact resistance.
The sub-cable comprises a nylon tight-buffered optical fiber 6 positioned in the center of the sub-cable, and glass yarns 3 are wound outside the nylon tight-buffered optical fiber; wrap up sub-cable sheath 5 behind 3 outer evenly distributed many aramid yarn 7 of glass yarn, be equipped with powder type water-blocking material 2 between sub-cable sheath and many aramid yarn, this water-blocking material is: the material adopted in the crosslinked polyacrylic acid expansion material is in a solid state, the particle diameter needs to be 0.5-0.8 mm, the polymer contains a large amount of hydrophilic genes, the polymer can be rapidly opened when meeting water, and the fine and uniform volume can be scattered in various gaps, so that the aim of actively blocking water is fulfilled.
The positioning framework is internally provided with a plurality of bag-shaped water-blocking materials 4, the outer skin bag film of the materials is solid and high temperature resistant, and can be melted when meeting water, the bag film is internally wrapped with the liquid water-blocking materials, the liquid water-blocking materials can expand when meeting water, the viscous state fills gaps, the requirements of deep water and longitudinal watertight are met, and the four sides of the positioning framework are arc-shaped.
The support framework is internally provided with a framework groove 8, the framework groove is internally provided with a strip framework 11 and a plurality of water-blocking yarns 10 distributed at two ends of the strip framework, two sides of the support framework, which are in contact with the sub-cables, are arc-shaped, the support framework is made of soft materials and used for ensuring the bending and twisting performance of the product, the design of the support framework avoids adhesion, the hidden danger of attenuation abnormality and even fiber breakage after the sub-cables are adhered is solved, and meanwhile, the roundness and the pressure resistance of the product are improved; the water blocking yarns are distributed in the gap area of the sub-cable and the sheath, and all gap spaces can be filled after the water blocking yarns are expanded when meeting water, so that the water blocking performance of the product is improved.
The same interval exists between every two support frameworks, and the interval is smaller than 1/22 of the circumference of the cable core; the distance between the strip frameworks is less than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the supporting framework and the strip-shaped framework is 1:4:4 for the sheath (the sheath is an integral structure formed by the inner sheath, the aramid yarn woven layer and the outer sheath); therefore, when the optical cable deforms 1/8, the supporting framework completes 360-degree annular supporting, meanwhile, the strip frameworks complete 360-degree annular supporting, and meanwhile, due to the design of gaps among the strip frameworks, the bending resistance of the product is guaranteed.
The circumference calculation formula of the supporting framework is as follows
When the 1/8 deformation is generated in the cable,
d a to support the perimeter formed by the skeleton after being stressed, d c Is the circumference of the cable core, d f To support the perimeter of the skeleton.
It should be noted that: add aramid yarn weaving layer between inlayer sheath and outer sheath, weave density and be greater than 99.5%, weaving layer clearance is less than 0.1mm, and aramid yarn's tensile strength needs to be greater than 3500Mpa to guarantee at the snap-in force: 110N, the occlusion frequency is 20 times/minute, and under the condition that the occlusion frequency is 10000 times, the sheath of the remote optical cable is not punctured;
the inner layer sheath, the outer layer sheath and the aramid yarn braided layer are integrally formed, so that the inner layer sheath, the outer layer sheath and the aramid yarn braided layer form a whole, the rat-bite-proof performance of the product is improved, the aramid yarn braided layer is surrounded by 360 degrees, the strength and the gap can effectively improve the rat-poison-proof performance, the inner layer and the outer layer of the sheath are separated, and the inner layer of the son cable is prevented from being exposed after the rat bites; the tensile property of the product is improved, and the utilization rate of the tensile strength of the directly-placed aramid fiber is not high: if the paying-off tension is small, the static states of the aramid fibers are inconsistent, and the aramid fibers cannot be stressed uniformly during stretching; if unwrapping wire tension is big, the aramid fiber atress has been even, but aramid fiber can appear deformation release and contract back, lead to the cable core atress crooked, product structure goes wrong, aramid fiber yarn after weaving, be in the mode of violently indulging the combination, can even atress and guarantee stable in structure, thereby mention the maximize with aramid fiber tensile strength's utilization ratio, and the aramid fiber yarn weaving layer of this product fuses with inlayer sheath and outer sheath, mention the maximize with the tensile strength utilization ratio of sheath material, thereby the tensile strength of product has been promoted, resistance to compression and impact resistance.
The invention also discloses a preparation method of the remote optical cable, which comprises the following steps:
1) preparing a sub cable: the nylon tight-buffered optical fiber is discharged straightly, and the paying-off tension of the nylon tight-buffered optical fiber is 80 g; the method comprises the following steps that a plurality of glass yarns are wound and paid off by taking a nylon tight-buffered optical fiber as a center, the nylon tight-buffered optical fiber is completely wrapped, a plurality of aramid fibers are flatly and straightly placed on the periphery of the wound glass yarns, meanwhile, water in compressed air is separated through an oil-water separation device by a powder type water-blocking material device, then the compressed air is injected into the powder type water-blocking material device, the powder type water-blocking material is randomly blown and scattered in the device, when a cable core passes through the device, the powder type water-blocking material is randomly scattered on the aramid fibers, the glass yarns and the nylon tight-buffered optical fiber, then a sub-cable sheath is extruded by a head of an extruding machine, and the sub-cable is wound on a turnover disc after being cooled;
2) preparing a positioning framework: adopting an extrusion molding forming process, adopting an extrusion process for a mold core and a mold sleeve, wherein the mold sleeve is of a special-shaped structure, 4 conduits are added in the mold core, after the installation is finished, the conduit of the mold core is in a state of being flush with the opening of the mold sleeve, an extrusion molding material enters a gap between the mold core and the mold sleeve through an extrusion molding machine head 18 and is extruded into a positioning framework through the mold sleeve, the saccular water-blocking material is placed in a saccular water-blocking material placing area 15, the saccular water-blocking material is uniformly transmitted to the conduit of the mold core through a transmission pipeline 17 through a pressurizing transmission device 16, and the saccular water-blocking material in the conduit is transmitted to corresponding holes in the positioning framework through the pressurizing transmission device;
3) preparing a supporting framework: firstly, adopting an extrusion mode, enabling an extrusion molding material to enter a gap between a mold core and a mold sleeve through an extrusion molding machine head, extruding the extrusion molding material into a strip-shaped framework through the mold sleeve, and fully cooling the extrusion molding material after the extrusion molding so as to be capable of being stored on a disc; strip skeleton and support chassis select two kinds of different materials, avoid the extrusion molding in-process to produce the adhesion phenomenon, adopt the crowded pipe mode during the support chassis extrusion molding: the mold core and the mold sleeve are designed in a curved shape, the mold core needs to protrude out of a mold sleeve opening during assembly, the mold core opening protrudes out of the mold sleeve opening after assembly by adopting a pipe extruding mode, a corresponding framework groove can be formed after extrusion molding, and a strip-shaped framework and water blocking yarns are distributed in the framework groove uniformly after molding by adopting an active pay-off mode during extrusion molding;
the same interval exists between every two support frameworks, and the interval is smaller than 1/22 of the circumference of the cable core; the distance between the strip-shaped frameworks is smaller than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the three layers of integrally formed sheaths, the supporting framework and the strip-shaped framework is 1:4: 4; therefore, when the optical cable generates 1/8 deformation, the supporting framework completes 360-degree annular support, and meanwhile, the strip-shaped framework also completes 360-degree annular support;
the circumference of the supporting framework is measured
By the formula, when 1/8 deformation is generated in the optical cable,
d a circumference formed for supporting the skeleton after being stressed, d c Is the circumference of the cable core, d f To support the perimeter of the skeleton;
it should be noted that, because the difference of the deformation ratio of the support framework and the strip framework in the support groove is large after being pressed and the bonding site can not appear, the same-layer extrusion molding process is adopted, meanwhile, in order to avoid the situation that the strip framework is contacted with the support framework to generate bonding without being cooled, a tube extruding form is adopted during extrusion molding, and water-blocking yarns are distributed in the framework groove to improve the water-blocking performance;
4) paying off the positioning framework in the step 2), the supporting framework in the step 3) and the plurality of sub-cables in the step 1) in a stranding mode, and then carrying out simultaneous extrusion molding on the inner-layer sheath, the outer-layer sheath and the aramid woven layer in a double-layer co-extrusion mode through a double-connection machine head to realize the production of the remote optical cable.
It should be noted that, in the step 4), an active pay-off device is added for placing the positioning framework between the symmetrical sub-cables, and a positioning device for preventing the positioning framework from twisting is installed at the outlet of the double wheels; a plurality of sub-cables are all paid off by adopting a twisting cage, the twisting cage adopts a back-twisting mode, a supporting framework between the sub-cables and the inner sheath is also released from the twisting cage, a correcting and positioning die is arranged in front of a twisting table to ensure the roundness after twisting and the accurate falling position of the supporting framework, the distance between the twisting table and an inner sheath extrusion molding device is required to be less than 15cm, a twisted cable core within 15cm is not easy to scatter, and if the length is too large, the twisting form is easy to deform and misplace; the outer sheath extrusion molding machine head 20 transfers sheath materials to the inner sheath extrusion molding machine head 19 through 4 runners (the 4 runners also play a supporting role), meanwhile, the heat insulation device 22 needs to be pulled to a fixed position during production (the heat insulation device is a movable sliding plate, and the sliding plate needs to be moved to a position completely covering the inner sheath extrusion molding machine head so as to move to the fixed position), during the extrusion molding of the inner layer sheath, the aramid yarn weaving device 24 synchronously weaves, controls the size, the number, the weaving knot and the weaving diameter of the aramid yarn, ensures that the weaving density is more than 99.5 percent, the clearance of the weaving layer is less than 0.1mm, the aramid yarn is weaved and wrapped in the uncooled inner layer sheath and directly enters the mold core of the extrusion molding device of the outer layer sheath, sheath extrusion is carried out through an extrusion mode and pressure vacuumizing, cooling is carried out through cooling water after extrusion, and the cooled remote optical cable is collected on a disc.
It should be noted that the doubly-linked aircraft nose divide into inlayer sheath extrusion molding aircraft nose 19 and outer sheath extrusion molding aircraft nose 20, and inlayer sheath extrusion molding aircraft nose is only 1/3 of outer sheath extrusion molding aircraft nose, and both connect through sheath material conveying runner 21 to inlayer sheath extrusion molding aircraft nose still is equipped with heat-proof device 22 and direction magnetic ring 23 outward, has solved 360 after weaving and has encircleed aramid yarn weaving layers and how to place in sheath inlayer and sheath skin simultaneous production with this.
The invention carries out optimization design according to a series of problems of long-distance overhead laying, water resistance, rat bite prevention, impact resistance and the like of the remote optical cable; the design of the framework filling layer and the aramid woven layer solves the problems of large attenuation, non-round optical cable, poor waterproofness and the like caused by the adhesion of the cable core and the sheath; aiming at the problem of rat bite prevention, the product needs long-distance overhead pulling, so the weight is not easy to be overlarge, the structure is not easy to be complicated, a rat-proof sheath material is adopted, an aramid woven layer surrounding 360 degrees is used as an auxiliary layer, and simultaneously, a tightly-sleeved optical fiber also adopts a nylon material; aiming at the problem that the outdoor laying of the product is easy to have large attenuation and even fiber breakage caused by impact, the aramid woven layer, the 360-degree annular support of the support framework and the strip-shaped framework are added in the design and form 3 protective layers of 360-degree annular support after being stressed, so that the tensile, water-blocking, rat-bite-preventing and impact-resisting characteristics of the product are improved on the premise of ensuring light weight of the product, small bending radius and full medium, and the product is more suitable for being laid and used remotely.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. A remote optical cable is characterized by comprising a positioning framework positioned in the center of the cable, supporting frameworks are symmetrically and respectively arranged along four corners of the positioning framework, a circular groove is formed between each positioning framework and each supporting framework, and a sub-cable is placed in each circular groove to form a cable core; the cable core is externally extruded with an inner sheath, the inner sheath is externally woven with an aramid yarn woven layer, and the aramid yarn woven layer is externally extruded with an outer sheath; the inner sheath, the aramid yarn woven layer and the outer sheath are integrally formed; a skeleton groove is arranged in the support skeleton, a strip-shaped skeleton and a plurality of water-blocking yarns distributed at two ends of the strip-shaped skeleton are arranged in the skeleton groove, and two edges of the support skeleton, which are in contact with the sub-cables, are arc-shaped; the same interval exists between every two support frameworks, and the interval is smaller than 1/22 of the circumference of the cable core; the distance between the strip-shaped frameworks is smaller than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the three layers of integrally formed sheaths, the supporting framework and the strip-shaped framework is 1:4: 4; therefore, when the optical cable generates 1/8 deformation, the supporting framework completes 360-degree annular support, and meanwhile, the strip-shaped framework also completes 360-degree annular support.
2. The remote cable as claimed in claim 1, wherein: the sub-cable comprises an optical fiber unit positioned in the center of the sub-cable, a plurality of aramid yarns are uniformly distributed outside the optical fiber unit and then wrapped by a sub-cable sheath, and a powder type water-blocking material is arranged between the sub-cable sheath and the plurality of aramid yarns.
3. The remote cable as claimed in claim 1, wherein: the positioning framework is internally provided with a plurality of saccular water blocking materials, and the four sides of the positioning framework are arc-shaped.
4. The remote cable as claimed in claim 2, wherein: the optical fiber unit comprises a nylon tight-buffered optical fiber and a glass yarn layer wound and wrapped outside the nylon tight-buffered optical fiber.
5. The remote cable as claimed in claim 1, wherein: the circumference calculation formula of the supporting framework is as follows
When the 1/8 deformation is generated in the cable,
d a to support the perimeter formed by the skeleton after being stressed, d c Is the circumference of the cable core, d f To support the perimeter of the skeleton.
6. A method of manufacturing a remote optical cable according to any one of claims 1 to 5, wherein: the method is characterized in that: the method comprises the following steps:
1) preparing a sub cable: the nylon tight-buffered optical fiber is discharged straightly, and the paying-off tension of the nylon tight-buffered optical fiber is 80 g; the method comprises the following steps that a plurality of glass yarns are wound and paid off by taking a nylon tight-buffered optical fiber as a center, the nylon tight-buffered optical fiber is completely wrapped, a plurality of aramid fibers are flatly and straightly arranged on the periphery of the wound glass yarns, meanwhile, powder type water-resistant materials are randomly scattered on the aramid yarns, the glass yarns and the nylon tight-buffered optical fiber through a powder type water-resistant material device, then, a cable sheath is extruded through a head of an extruding machine, and a cable is wound on a turnover disc after cooling;
2) preparing a positioning framework: adopting an extrusion molding forming process, adopting an extrusion process for a mold core and a mold sleeve, wherein the mold sleeve is of a special-shaped structure, 4 conduits are added in the mold core, after the installation is finished, the conduit of the mold core is in a state of being flush with the opening of the mold sleeve, an extrusion molding material enters a gap between the mold core and the mold sleeve through an extrusion molding machine head, the extrusion molding material is extruded into a positioning framework through the mold sleeve, a saccular water-blocking material is placed in a saccular water-blocking material placing area, the saccular water-blocking material is uniformly conveyed to the conduits of the mold core through a conveying pipeline through a pressurizing conveying device, and the saccular water-blocking material in the conduits is conveyed to corresponding holes in the positioning framework through the pressurizing conveying device;
3) preparing a supporting framework: firstly, adopting an extrusion mode, enabling an extrusion molding material to enter a gap between a mold core and a mold sleeve through an extrusion molding machine head, extruding the extrusion molding material into a strip-shaped framework through the mold sleeve, and fully cooling the extrusion molding material after the extrusion molding so as to be capable of being stored on a disc; two kinds of different materials are selected to strip skeleton and support skeleton, avoid the extrusion molding in-process to produce the adhesion phenomenon, adopt the crowded pipe mode during the support skeleton extrusion molding: the mold core and the mold sleeve are designed in a curved shape, the mold core needs to protrude out of a mold sleeve opening during assembly, the mold core opening protrudes out of the mold sleeve opening after assembly by adopting a pipe extruding mode, a corresponding framework groove can be formed after extrusion molding, and a strip-shaped framework and water-blocking yarns are distributed in the framework groove uniformly after molding by adopting an active pay-off mode during extrusion molding;
the same interval exists between every two support frameworks, and the interval is smaller than 1/22 of the circumference of the cable core; the distance between the strip-shaped frameworks is smaller than 1/22 of the perimeter of the cable core; the deformation ratio of the strip-shaped framework is greater than that of the supporting framework, and the deformation ratio of the sheath, the supporting framework and the strip-shaped framework which are integrally formed in the three layers is 1:4: 4; therefore, when the optical cable generates 1/8 deformation, the supporting framework completes 360-degree annular support, and meanwhile, the strip-shaped framework also completes 360-degree annular support;
the circumference calculation formula of the supporting framework
To this end, when 1/8 deformation is generated in the cable,
d a to support the perimeter formed by the skeleton after being stressed, d c Is the circumference of the cable core, d f In order to support the perimeter of the frame,
4) paying off the positioning framework in the step 2), the supporting framework in the step 3) and the plurality of sub-cables in the step 1) in a stranding mode, and then carrying out simultaneous extrusion molding on the inner-layer sheath, the outer-layer sheath and the aramid woven layer in a double-layer co-extrusion mode through a double-connection machine head to realize the production of the remote optical cable.
7. The method for preparing a remote optical cable according to claim 6, wherein: the bicontinuous aircraft nose divide into inlayer sheath extrusion molding aircraft nose and outer sheath extrusion molding aircraft nose, inlayer sheath extrusion molding aircraft nose is only 1/3 of outer sheath extrusion molding aircraft nose, both connect through sheath material conveying runner to inlayer sheath extrusion molding aircraft nose still is equipped with heat-proof device and direction magnetic ring outward.
8. The method for preparing a remote optical cable according to claim 6, wherein: step 4), an active pay-off device is additionally arranged and used for placing a positioning framework between the symmetrical sub-cables, and a positioning device for preventing the positioning framework from twisting is arranged at an outlet of the double wheels; a plurality of sub-cables are all paid off by adopting a twisting cage, the twisting cage adopts a back-twisting mode, a supporting framework between the sub-cables and the inner sheath is also paid off from the twisting cage, a correcting and positioning die is arranged in front of a twisting table, the roundness after twisting and the accurate falling position of the supporting framework are ensured, and the distance between the twisting table and an inner sheath extrusion molding device is required to be less than 15 cm; the doubly-linked aircraft nose divide into inlayer sheath extrusion molding aircraft nose and outer sheath extrusion molding aircraft nose, outer sheath extrusion molding aircraft nose passes to the inlayer sheath extrusion molding aircraft nose with the sheath material through 4 runners in, simultaneously need to pull heat insulation apparatus to fixed position when producing, when inlayer sheath extrusion molding, aramid yarn weaving device is weaving in step, control aramid yarn's size, the radical, weave the node utensil, weave the diameter, guarantee to weave density and be greater than 99.5%, the weaving layer clearance is less than 0.1mm, aramid yarn is woven and is wrapped up in the direct mold core that gets into outer sheath extrusion molding device of uncooled inlayer sheath, carry out sheath extrusion through extrusion mode and assistance pressure evacuation, cool off through the cooling water after the extrusion, and receive the optical cable that zooms out that cools off on the dish utensil.
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| PCT/CN2021/140533 WO2022233142A1 (en) | 2021-05-07 | 2021-12-22 | Remote optical cable and preparation method therefor |
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| CN113433634B (en) * | 2021-05-07 | 2022-09-06 | 江苏俊知光电通信有限公司 | Remote optical cable and preparation method thereof |
| CN114296193B (en) * | 2021-12-22 | 2024-04-02 | 江苏亨通华海科技股份有限公司 | Method and device for enhancing cladding force of aramid yarn armor layer of cable |
| CN116978610A (en) * | 2023-08-11 | 2023-10-31 | 新疆中超新能源电力科技有限公司 | Tensile wear-resistant waterproof medium-voltage cable |
| CN117341175B (en) * | 2023-12-04 | 2024-02-02 | 湖南湘联电缆有限公司 | Plastic extrusion die for mineral fireproof cable production |
| CN117649983B (en) * | 2024-01-29 | 2024-03-29 | 江苏亨通华海科技股份有限公司 | Preparation process of steel wire embedded cable |
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| US4807962A (en) * | 1986-03-06 | 1989-02-28 | American Telephone And Telegraph Company, At&T Bell Laboratories | Optical fiber cable having fluted strength member core |
| CN101806944A (en) * | 2010-05-08 | 2010-08-18 | 蒋菊生 | Framework type optical cable with improved structure |
| CN104849824A (en) * | 2015-06-15 | 2015-08-19 | 长飞光纤光缆股份有限公司 | Full-dry nonmetal self-supporting skeleton-type optical cable |
| CN105427948B (en) * | 2015-10-27 | 2017-08-08 | 长飞光纤光缆股份有限公司 | Skeleton optoelectronic composite cable and its manufacture method |
| CN105759383A (en) * | 2016-04-15 | 2016-07-13 | 富通住电特种光缆（天津）有限公司 | Multilayer skeleton slot optical cable and manufacturing method thereof |
| CN206584093U (en) * | 2017-02-27 | 2017-10-24 | 上海昱品通信科技股份有限公司 | Beat easily adjusts intensive skeleton optical cable making machine |
| CN107065100A (en) * | 2017-04-19 | 2017-08-18 | 成都亨通光通信有限公司 | A kind of cross leading in cable |
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| CN211125100U (en) * | 2019-06-24 | 2020-07-28 | 宁波东方电缆股份有限公司 | Filling structure for multi-core submarine cable |
| CN110673283B (en) * | 2019-10-23 | 2021-01-12 | 杭州富通通信技术股份有限公司 | Manufacturing process of optical cable |
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| CN212781420U (en) * | 2020-09-14 | 2021-03-23 | 江苏中天科技股份有限公司 | Sensing optical cable |
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