CN118363126B - A central tube armored optical cable, preparation method and production system - Google Patents
A central tube armored optical cable, preparation method and production system Download PDFInfo
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- CN118363126B CN118363126B CN202410766013.3A CN202410766013A CN118363126B CN 118363126 B CN118363126 B CN 118363126B CN 202410766013 A CN202410766013 A CN 202410766013A CN 118363126 B CN118363126 B CN 118363126B
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Classifications
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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
-
- 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
-
- 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
- G02B6/4483—Injection or filling devices
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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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Abstract
The application discloses a central tube type armored optical cable, a preparation method and a production system, which belong to the technical field of optical cable preparation and comprise the following steps: the center of the sheath forms an empty pipe structure along the axial direction, and at least one light unit is arranged in the empty pipe structure; the sheath is embedded with a plurality of reinforcing pieces along the circumferential direction of the hollow tube structure, and the plurality of reinforcing pieces form a protective structure on the periphery of the light unit; each reinforcement piece is rotationally twisted and arranged at a first twisting pitch by the respective axle center; the plurality of reinforcing members are rotationally twisted along the axis of the sheath at a second twisting pitch. According to the central tube type armored optical cable, the reinforcement twisting arrangement structure can form an armored structure in the optical cable, so that the anti-biting capacity of the optical cable is improved, when the optical cable is bent, one side of the reinforcement in one twisting pitch stretches, and the other side of the reinforcement in one twisting pitch contracts, the integral bending performance of the optical cable is ensured, and the service life of the optical cable is prolonged.
Description
Technical Field
The invention belongs to the technical field of optical cable preparation, and particularly relates to a central tube type armored optical cable, a preparation method and a production system.
Background
Optical cables are cable structures manufactured to meet optical, mechanical, or environmental performance specifications, and are communication cable assemblies that utilize one or more optical fibers disposed in a surrounding jacket as a transmission medium and may be used alone or in groups.
The central tube type optical cable is an optical cable structure which is characterized in that an accommodating space of an optical unit is formed at the central part of the optical cable, reinforcing parts are embedded in the circumferential direction of a sheath, and the central tube type optical cable has the characteristics of light weight, small diameter and low cost, and is generally applied to scenes with low core number of the optical cable or small size of a construction pipeline. Because the center of the central tube type optical cable is not provided with a reinforcement, the reinforcement structure needs to be embedded in the side wall surface of the sheath so as to ensure the whole tensile property and the compression resistance of the optical cable.
In the conventional central tube type optical cable, single or double parallel reinforcing members are correspondingly arranged on two sides of the optical cable to serve as a reinforcing structure, when the optical cable is bent, the optical cable deviates towards one side, so that the reinforcing members positioned on the inner side in the bending direction are extruded, the reinforcing members positioned on the outer side in the bending direction are stretched, and the bending performance of the optical cable is influenced; moreover, because the center of the central tube type optical cable is in a hollow tube structure, the outer part of the central tube type optical cable is only provided with a sheath for protection, the reinforcing parts positioned at the two sides of the sheath cannot block the biting of rodents, and when the sheath is bitten by animals, the inner light unit is exposed or damaged, so that the problems of communication interruption and the like are easily caused.
Disclosure of Invention
In response to one or more of the above-identified deficiencies or improvements in the prior art, the present invention provides a center tube armored fiber optic cable that addresses the problems of poor bending performance and poor protective performance of existing center tube fiber optic cables.
To achieve the above object, the present invention provides a center tube type armored optical cable, comprising:
The optical fiber cable comprises a sheath, wherein a hollow pipe structure is formed in the center of the sheath along the axial direction, and at least one optical unit is arranged in the hollow pipe structure;
The sheath is embedded with a plurality of reinforcing pieces along the circumferential direction of the hollow tube structure, and the reinforcing pieces form a protective structure on the periphery of the light unit;
each reinforcement piece is rotationally twisted along a first direction by a respective axle center; the plurality of reinforcing pieces are rotationally twisted along the second direction by the axis of the sheath;
And the first direction is opposite the second direction.
As a further improvement of the present invention, the reinforcing members are twisted at a first twisting pitch along the respective axes, the plurality of reinforcing members are twisted at a second twisting pitch along the sheath axes, and the first twisting pitch is not smaller than the second twisting pitch.
As a further improvement of the invention, a plurality of the reinforcing members are surrounded to form an annular structure, and gaps are reserved between two adjacent reinforcing members.
As a further improvement of the invention, the ratio of the gap between two adjacent reinforcing pieces to the diameter of the reinforcing piece is 0.4-0.8.
As a further improvement of the present invention, a plurality of the reinforcing members are surrounded to form an annular structure, and outer peripheral wall surfaces of two adjacent reinforcing members are abutted against each other.
As a further improvement of the present invention, the outer circumferences of the plurality of reinforcing members are covered with EAA films.
As a further improvement of the invention, the reinforcement is one of a steel wire, a steel strand, a stainless steel wire, a GFRP rod, a KFRP rod or an FFRP rod.
As a further improvement of the present invention, the reinforcing member is a high modulus steel wire, and the modulus of the reinforcing member is not less than 170GPa.
As a further improvement of the invention, the light units are a plurality of light units, and the light units are one or more of micro-cluster units, optical fiber ribbons, butterfly-shaped lead-in cables and net-shaped optical fiber ribbons.
The application also comprises a preparation method of the central tube type armored optical cable, which comprises the following steps:
A traction light unit;
A plurality of stiffeners are arranged outside the light unit Zhou Jiaoge with the light unit as a center;
rotating and twisting the reinforcing pieces along the first direction by respective axes; rotating and twisting the plurality of reinforcing pieces along a second direction by the axis of the sheath;
And (3) introducing the optical unit and the plurality of reinforcing pieces into an extrusion die together, extruding and forming the sheath by adopting a vacuum sizing process, and forming to obtain the central tube type armored optical cable.
As a further improvement of the present invention, a plurality of the reinforcing members are arranged in the following manner:
arranging a twisting mold in the inlet direction of the extrusion mold, reserving a through hole for the light unit to pass through in the center of the twisting mold, and axially arranging a plurality of through holes for the reinforcing piece to pass through along the center of the twisting mold;
Introducing a light unit and a plurality of stiffeners into a stranding die;
The twisting mold drives the plurality of stiffeners to rotate around the respective axes, and the twisting mold drives the plurality of stiffeners to rotate around the optical unit.
As a further improvement of the present invention, a plurality of the reinforcing members are arranged in the following manner:
arranging a twisting mold in the inlet direction of the extrusion mold, reserving a through hole for the light unit to pass through in the center of the twisting mold, and circumferentially arranging a plurality of through holes for the reinforcing piece to pass through along the center of the twisting mold;
Introducing a light unit and a plurality of stiffeners into a stranding die;
The twisting mold drives the plurality of stiffeners to rotate around the respective axes, and the twisting mold synchronously drives the plurality of stiffeners to rotate around the optical unit.
The application also includes a production system for a center tube armored fiber optic cable comprising:
the first paying-off device is used for paying out the light unit;
a second pay-off device for paying out the reinforcement;
the stranding die is arranged along the paying-off direction of the first paying-off device;
the twisting mold comprises a reinforcement twisting cage and a rotating mechanism which are sequentially arranged along the paying-off direction;
The reinforcement winch cage and the rotating mechanism are provided with a first through hole for the light unit to pass through and a second through hole for a plurality of reinforcements to pass through, and the second through holes are circumferentially distributed on the periphery of the first through hole;
A first driving mechanism is arranged in the reinforcement cage and is attached to the inner wall of the second through hole so as to drive the plurality of reinforcements to automatically rotate in the second through hole; the rotating mechanism is provided with a second driving mechanism which is used for driving the reinforcing pieces to rotate around the light unit;
The extrusion die is arranged along the traction direction of the first paying-off device, and the extrusion die is arranged at the outlet end of the stranding die.
As a further improvement of the invention, the extrusion die comprises a vacuum sizing mechanism, the vacuum sizing mechanism comprises a cooling water tank, a plurality of vacuum copper pipes are axially distributed in the cooling water tank, the inner walls of the vacuum copper pipes are provided with adsorption holes, the vacuum copper pipes are connected with a negative pressure assembly, and gaps are reserved among the vacuum copper pipes.
As a further improvement of the invention, the extrusion die further comprises an extrusion mechanism, and the extrusion mechanism is arranged at the outlet end of the stranding die;
the extruding mechanism comprises a die core and a die cover which are coaxially sleeved;
The mold core comprises a first guide part and a second guide part which are arranged in a stepped manner, the second guide part is of a cylindrical structure, and the second guide part axially stretches into the mold cover; a plurality of third through holes are formed in the joint end surface of the first guide part and the second guide part, and the third through holes are arranged along the circumferential direction of the second guide part;
An extrusion runner in conical arrangement is arranged in the die cover, and the die core is at least partially penetrated in the extrusion runner;
A fourth through hole which is coaxially arranged with the second guide part is formed in one end of the extrusion flow passage, which is away from the mold core, and the inner diameter of the fourth through hole is larger than the outer diameter of the second guide part;
a flow dividing plate is further arranged in the extrusion flow passage and sleeved on the periphery of the second guide part;
the flow dividing plate comprises a flow dividing part which is radially arranged along the fourth hole, and a fifth through hole for passing through the sheath material is formed in the flow dividing part;
One end of the flow dividing part is abutted against the inner wall of the die cover, the other end of the flow dividing part is connected with the narrowing part, the narrowing part is in a frustum shape, the inner diameter of the narrowing part gradually reduces towards one end of the fourth through hole, and a gap is reserved between the narrowing part and the outer wall surface of the second guiding part.
The above-mentioned improved technical features can be combined with each other as long as they do not collide with each other.
In general, the above technical solutions conceived by the present invention have the beneficial effects compared with the prior art including:
(1) According to the central tube type armored optical cable, the plurality of reinforcement structures are embedded in the sheath, and the protective armored structure is formed on the periphery of the optical unit through the reinforcement, so that on one hand, the tensile and compressive resistance of the optical cable can be enhanced, and on the other hand, the optical cable can be blocked when a rodent bites the optical cable, so that the protective performance of the central tube type armored optical cable outdoors and in a pipeline can be ensured. In addition, the plurality of reinforcing members are rotationally twisted along the axis of the sheath, when the central tube type armored optical cable is extruded and bent in a certain direction, one side of each reinforcing member is bent and stretched in one twisting pitch, and the other side of each reinforcing member is bent and compressed, so that balance is realized, the problems that the reinforcing member on one side is contracted and the reinforcing member on the other side is stretched when the conventional central tube type optical cable is bent are avoided, the integral bending performance of the optical cable is ensured, the reinforcing member is not damaged, and the service life of the optical cable is prolonged.
(2) According to the central tube type armored optical cable, the arrangement quantity of the reinforcing pieces is adjusted, and on the premise that the sheath materials enter the inner sides of the reinforcing pieces, gaps between adjacent reinforcing pieces are reduced as far as possible, so that the reinforcing pieces are surrounded to form a protective structure, and the central tube type armored optical cable has good anti-biting capability.
(3) According to the central tube type armored optical cable, the high-modulus steel wire is selected as the reinforcing piece, so that the compressive property of the optical cable is enhanced, the untwisting force of the reinforcing piece twisted along the axis can be counteracted through the twisting capacity of the reinforcing piece, and the stable forming of the central tube type armored optical cable is ensured.
(4) According to the preparation method of the central tube type armored optical cable, the problem that a sleeve is required to be sleeved outside the optical unit Zhou Ewai in the traditional optical cable preparation process, the sleeve is used for supporting twisting of the reinforcing piece and the like and extrusion of the sheath is avoided, the optical unit and the reinforcing piece can be directly led in, the reinforcing piece is formed in the sheath, one-step forming of the central tube type armored optical cable is achieved, and the preparation efficiency of the optical cable is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a prior art center tube cable;
FIG. 2 is a schematic view of the overall structure of a center tube armored fiber optic cable in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the overall structure of another embodiment of the invention for a center tube armored fiber optic cable;
FIG. 4 is a twisted cross-sectional view of a reinforcement member according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of the overall twist of a reinforcement member in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of the overall structure of a center tube armored cable production system in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view showing the overall structure of an extrusion die according to an embodiment of the present invention;
FIG. 8 is a schematic view of the structure of a mold core in an embodiment of the invention;
fig. 9 is a schematic view of the structure of a mold cover in an embodiment of the present invention.
Like reference numerals denote like technical features throughout the drawings, in particular:
1. A light unit; 2. a water blocking tape; 3. a sheath; 4. a reinforcing member; 5. a reinforcement cage; 6. a rotation mechanism; 7. an extrusion mechanism; 8. a vacuum sizing mechanism;
701. a mold core; 702. a mold cover; 703. a first guide part; 704. a second guide part; 705. a third through hole; 706. a fourth through hole; 707. a diverter plate; 708. and a fifth through hole.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, it should be understood that unless otherwise indicated, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are directional or positional relationships indicated based on the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Examples:
Referring to fig. 1 to 9, a central tube type armored optical cable in a preferred embodiment of the present application includes a sheath 3, wherein a hollow tube structure is formed at the center of the sheath 3 along the axial direction, and at least one optical unit 1 is disposed in the hollow tube structure; the sheath 3 is embedded with a plurality of stiffeners 4 along the circumference of the hollow pipe structure, and the stiffeners 4 form a protective structure on the periphery of the light unit 1; in the present application, the reinforcing members 4 are rotatably twisted along the respective axes at a first twisting pitch, and the reinforcing members 4 are rotatably twisted along a first direction; next, the plurality of reinforcing members 4 are rotatably twisted along the axial center of the sheath 3 at the second twisting pitch, the plurality of reinforcing members 4 are rotatably twisted in the second direction, and the first direction is opposite to the second direction.
Specifically, the central tube type armored optical cable has the characteristics of light weight, small diameter, low cost and the like; and through embedding a plurality of reinforcement 4 structures in sheath 3, form the protection armor structure at light unit 1 periphery through reinforcement 4, its one side can strengthen the tensile compressive capacity of optical cable, and on the other hand can block when the rodent bites the optical cable to ensure the protective properties of this central tube armor optical cable in open air and pipeline. In addition, the plurality of the reinforcing members 4 are rotationally twisted along the axis of the sheath 3, when the central tube type armored optical cable is extruded and bent in a certain direction, one side of each reinforcing member 4 bends and stretches in one twisting pitch, and the other side bends and compresses, so that balance is realized, the problems that the reinforcing member 4 on one side contracts and the reinforcing member 4 on the other side stretches when the conventional central tube type optical cable is bent are avoided, the integral bending performance of the optical cable is ensured, the reinforcing member 4 is not damaged, and the service life of the optical cable is prolonged. Meanwhile, the reinforcing members 4 are rotationally twisted by the respective axes, so that the reinforcing members 4 rotate by the respective axes and revolve by the axes of the sheath 3, the integral twisting force of the reinforcing members 4 is overcome by the self-twisting of the reinforcing members 4, the twisting back-twisting problem of the central tube type armored optical cable in the forming process is avoided, and the stable forming of the optical cable is ensured.
Specifically, the first direction in the present application refers to a clockwise direction or a counterclockwise direction along the circumference of the section of the sheath 3, as viewed from one side toward the section of the sheath 3, with the section of the sheath 3 as the center; the second direction refers to the opposite direction to the first direction, i.e. when the first direction is clockwise, the second direction is counterclockwise, both directions being kept opposite.
Further preferably, the first twisting pitch is not smaller than the second twisting pitch in the present application. Specifically, when the central tube type armored optical cable in the application is molded, each reinforcing member 4 is twisted along the axial direction of the sheath 3, and the twisting force of the reinforcing member 4 can correspondingly offset the twisting force of the plurality of reinforcing members 4 due to the fact that the rotation direction of the reinforcing member 4 is opposite to the revolution direction, so that the twisting force of the reinforcing members 4 after the plurality of reinforcing members 4 are twisted into a bundle can not be applied to the outer sheath 3, and further the problem that the outer sheath 3 cannot be molded due to the untwisting force of the plurality of reinforcing members 4 in the extrusion molding process is solved, and the stable molding of the central tube type armored optical cable is ensured. It should be noted that the first twisting pitch represents the twisting of the reinforcement 4 itself, which self-rotation does not shear the sheath material, but only causes the separation between the reinforcement 4 and the sheath 3, without affecting the stable shaping of the sheath 3. Of course, as a preferred embodiment, the first twisting pitch is equal to the second twisting pitch, which allows the strength members to be formed substantially flat within the jacket and to be twisted integrally within the jacket, so that the center tube armored cable has better protective properties.
Further, as a preferred embodiment of the present application, a plurality of reinforcing members 4 in the present application are surrounded to form a ring-like structure with a gap left between adjacent reinforcing members 4. Since the strength members 4 of the present application are embedded inside the jacket 3, the jacket 3 is extruded from the outside during the molding of the cable. In order to avoid the reinforcement 4 from forming a similar tubular structure around, the material of the sheath 3 cannot enter the inner side of the reinforcement 4, and the hollow tube structure cannot be formed. According to the application, by controlling the arrangement interval of the reinforcing pieces 4, gaps are reserved between adjacent reinforcing pieces 4, so that the material of the sheath 3 can enter the inner side of the reinforcing pieces 4, and a hollow pipe structure can be formed.
Further preferably, the ratio of the gap between every two adjacent reinforcing members 4 to the diameter of the reinforcing member 4 is 0.4 to 0.8. By controlling the gap distance, the extrusion rate of the material of the sheath 3 into the inner side of the reinforcing member 4 is further ensured, and the integral forming efficiency of the sheath 3 is ensured, so that the integral forming of the sheath 3 is facilitated. It should be noted that, when the gap is too small, the stiffener 4 may obstruct the flow of the material of the sheath 3, and further may affect the molding of the sheath 3; when the clearance is too big, the tooth of rodent is passed the clearance easily in order to bite the optical cable to can lead to the optical cable after the shaping can't form mutual butt structure when receiving outside extrusion, and then finally with outside pressure transfer to light unit 1, lead to reinforcement 4 unable better protective effect of playing.
Further preferably, the gap between every two adjacent reinforcing members 4 in the present application is 0.5mm to 1.5mm. In order to avoid that the size of the reinforcing members 4 is too large or too small, the gaps between the reinforcing members 4 are difficult to control, and in general, the gaps between every two adjacent reinforcing members 4 are 0.5 mm-1.5 mm, so that the material of the sheath 3 can easily enter the inner side of the reinforcing members 4, and the anti-biting capability of the reinforcing members 4 can be ensured.
Further preferably, as an alternative embodiment of the present application, the reinforcing members 4 in the present application are formed around in a ring-like structure, and the outer peripheral wall surfaces of the adjacent two reinforcing members 4 abut against each other. Specifically, when the reinforcing members 4 are mutually abutted and jointed to form an annular structure, the central tube type armored optical cable has better pressure resistance.
Further, in the present application, the outer circumferences of the plurality of stiffeners 4 are coated with EAA film. EAA is an ethylene-acrylic acid copolymer that has good adhesion and toughness. When the EAA film is coated on the surface of the reinforcing member 4, the EAA film does not affect the traction setting of the reinforcing member 4, when the sheath 3 is extruded, the EAA film is correspondingly melted under the action of the sheath 3 material due to the lower melting point of the EAA film, so that the EAA film has better adhesion performance, the reinforcing member 4 and the sheath 3 are stably adhered to form an integrated structure of the reinforcing member 4 and the sheath 3, and the layering of the reinforcing member 4 and the sheath 3 is avoided.
Specifically, the reinforcing member 4 in the present application may be one of a steel wire, a steel strand, a stainless steel wire, a GFRP rod, a KFRP rod, or an FFRP rod. It is noted that when the reinforcing member 4 in the present application is a steel wire, a steel strand or a stainless steel wire, it is necessary to coat a film on the surface thereof in order to improve the adhesion property of the reinforcing member 4 to the sheath 3.
Further, the reinforcing member 4 in the present application is a high modulus steel wire, and the modulus of the reinforcing member 4 is not lower than 170GPa. In the conventional optical cable structure, a low-modulus steel wire is generally adopted, and has better bending performance so as to meet the requirement of the bending performance of the optical cable, and correspondingly, poor compression resistance and bending resistance can cause poor protection capability. Meanwhile, in the self-twisting process of the low-modulus steel wire, the steel wire can correspondingly deform and does not have restoring force, so that the reinforcing piece 4 cannot have reverse torsion in the twisting process of the plurality of reinforcing pieces 4 by the axis of the sheath 3, the reinforcing piece 4 has reverse torsion, and the sheath 3 cannot be stably molded on the periphery of the reinforcing piece 4. Therefore, the application selects the high-modulus steel wire, so that the self-twisting of the reinforcing member 4 can generate the untwisting force for overcoming the twisting of the reinforcing member 4 by the axis of the sheath 3, thereby ensuring the untwisting problem of the reinforcing member 4 in the production process of the central tube type armored optical cable, ensuring the optical cable molding and improving the product yield.
Further preferably, the light unit 1 in the present application is a plurality, and the light unit 1 may be one or more of a micro cluster unit, an optical fiber ribbon, a butterfly-shaped lead-in cable, and a mesh optical fiber ribbon. Of course, other forms of light units 1 than the light units 1 described above, which may be accommodated in a central tube cable, are intended to be covered within the scope of the application.
Further alternatively, the hollow tube structure in the sheath 3 of the present application may further be provided with a water blocking tape 2, a water blocking yarn or water blocking powder, etc. to ensure the water blocking performance of the central tube type armored optical cable of the present application.
Optionally, in order to increase the stripping performance of the central tube type armored optical cable, a cable opening structure can be embedded in the inner wall of the hollow tube structure of the sheath 3, so as to facilitate the stripping of the optical cable at a later stage.
Further, for the central tube type armored optical cable, the application also comprises a preparation method of the central tube type armored optical cable, which comprises the following steps:
a traction light unit 1;
A plurality of stiffeners 4 are arranged outside Zhou Jiaoge the light unit 1, centered on the light unit 1;
Rotating and twisting the reinforcing pieces 4 along the first direction by respective axes; and rotationally twisting the plurality of reinforcing members 4 along the second direction by the axis of the sheath;
The optical unit 1 and the plurality of stiffeners 4 are jointly introduced into an extrusion die, a sheath is extruded and molded by adopting a vacuum sizing process, and the central tube type armored optical cable is obtained by molding.
Specifically, the plurality of stiffeners 4 are arranged in the present application in the following manner: arranging a twisting mold in the inlet direction of the extrusion mold, reserving a through hole for the light unit 1 to pass through in the center of the twisting mold, and circumferentially arranging a plurality of through holes for the reinforcing piece 4 to pass through along the center of the twisting mold; introducing the light unit 1 and the plurality of stiffeners 4 into a stranding die; the twisting mold drives the plurality of reinforcing members 4 to rotate around the respective axes, and the twisting mold drives the plurality of reinforcing members 4 to rotate around the optical unit 1. Since the present application needs to form an annular structure by the reinforcement 4, and the reinforcement 4 itself includes self-twisting and twisting with the axis of the sheath 3 as the center, the present application needs to provide a twisting mold that drives the reinforcement 4 to rotate on the one hand, and drives the reinforcement 4 to revolve with the axis of the sheath 3 as the center on the other hand. Correspondingly, since the sheath 3 structure has not been prepared at the stage of the reinforcement 4 arrangement, and the light unit 1 is placed in the center of the hollow tube structure, the light unit 1 is arranged here as the center of the reinforcement 4 for the subsequent molding extrusion of the sheath 3.
Further, for the center tube type armored optical cable in the application, the application correspondingly comprises a production system of the center tube type armored optical cable, which is used for preparing the center tube type armored optical cable in the application, and specifically comprises the following steps:
a first paying-out device for paying out the light unit 1;
A second paying-out device for paying out the reinforcing member 4;
A twisting mold provided along a drawing direction of the first paying-off device for introducing the light unit 1 and the reinforcing member 4 and twisting-molding the reinforcing member 4 at an outer circumference of the light unit 1;
the stranding die comprises a reinforcement stranding cage 5 and a rotating mechanism 6 which are sequentially arranged along the paying-off direction;
Wherein, the reinforcement cage 5 and the rotating mechanism 6 are provided with a first through hole for the light unit 1 to pass through and a second through hole for the plurality of reinforcements 4 to pass through, and the plurality of second through holes are circumferentially distributed on the periphery of the first through hole; a first driving mechanism is arranged in the reinforcement cage 5 and is attached to the inner wall of the second through hole and used for driving the plurality of reinforcements 4 to automatically rotate in the second through hole; the rotating mechanism 6 is provided with a second driving mechanism which is used for driving the plurality of reinforcing pieces 4 to rotate around the light unit 1;
And the extrusion die is arranged along the traction direction of the first paying-off device, and the extrusion die is arranged at the outlet end of the stranding die.
Specifically, the twisting mold is set to be in a combined form of the reinforcement twisting cage 5 and the rotating mechanism 6, the first driving mechanism in the reinforcement twisting cage 5 drives the reinforcement 4 to rotate automatically, and the second driving mechanism drives the rotating mechanism 6 to rotate so as to realize revolution of the reinforcement 4. The combination of the reinforcement cage 5 and the rotating mechanism 6 makes the self-rotation and the revolution of the reinforcement 4 easier to implement, and the split arrangement can make the distance between the reinforcement cage 5 and the rotating mechanism 6 adjustable, so as to facilitate the adjustment of the revolution dynamic twisting pitch of the reinforcement 4.
Still further, the first driving mechanism in the present application is a plurality of rotating wheels circumferentially arranged along the second through hole, and the plurality of rotating wheels form oblique threads along the second through hole in the axial direction, so that the rotating wheels not only can twist the reinforcing member 4 to rotate when rotating, but also do not affect the traction of the reinforcing member 4. Preferably, the spacing between the plurality of rotating wheels is adjustable in the present application so that the plurality of rotating wheels can grip and rub the reinforcing members 4 of different diameters correspondingly.
Further, the extrusion die further comprises a vacuum sizing mechanism 8, the vacuum sizing mechanism 8 comprises a cooling water tank, a plurality of vacuum copper pipes are axially distributed in the cooling water tank, and adsorption holes are formed in the inner walls of the plurality of vacuum copper pipes. And the vacuum copper pipes are connected with a negative pressure component, and gaps are reserved among the vacuum copper pipes. Specifically, the application adopts a vacuum sizing process to form the sheath 3, the vacuum sizing mechanism 8 comprises a cooling water tank, a plurality of vacuum copper pipes are axially distributed in the cooling water tank, the vacuum copper pipes are all arranged in the cooling water, a closed space is formed by the cooling water, meanwhile, a negative pressure component is arranged on the outer side of the cooling water tank, the negative pressure component is connected with each vacuum copper pipe, the inner wall of each vacuum copper pipe is provided with an adsorption hole, and vacuum is pumped through the negative pressure component, so that when the sheath 3 material passes through the vacuum copper pipe, the vacuum copper pipes can correspondingly adsorb the sheath 3 material, so as to form an inner empty sheath 3 structure. The gap between the vacuum copper pipes is used for filling cooling water, and the cooling water can be used for correspondingly cooling the jacket 3, so that the jacket 3 is correspondingly cooled and molded.
It is noted that the gap between the vacuum copper tubes in the present application is gradually increased. In the process of forming the sheath 3, the sheath 3 is contacted with cooling water and gradually formed, so that the shape retaining capacity of the sheath 3 is gradually enhanced, and therefore, gaps between vacuum copper pipes can be gradually enlarged, the outer wall of the sheath 3 is contacted with more cooling water, and the cooling and shaping of the sheath 3 are accelerated. Furthermore, the negative pressure component is a specially-made vacuumizing component, and when the vacuum copper pipe is vacuumized, cooling water in the cooling water tank is correspondingly pumped away, and the cooling water and air can be correspondingly discharged by the negative pressure component, so that the vacuumizing capability of the negative pressure component on the vacuum copper pipe is ensured.
Further, as a preferred embodiment of the present application, the extrusion die of the present application further comprises an extrusion mechanism 7, and the extrusion mechanism 7 is disposed at an outlet end of the stranding die. When a gap is reserved between the reinforcing members 4 in the central tube type armored optical cable, the reinforcing members 4 and the optical units 1 are led into the vacuum sizing mechanism 8, the outer periphery of the reinforcing members 4 is coated with the sheath 3 material, and finally the reinforced optical cable is molded through the vacuum sizing mechanism 8. When the reinforcing members 4 in the central tube type armored optical cable are mutually abutted, the sheath 3 material cannot enter the inner side of the reinforcing members 4, and the central tube type armored optical cable cannot be obtained by conventional technology.
Based on the above, the application correspondingly designs an extrusion mechanism 7, which comprises a die core 701 and a die cover 702 coaxially sleeved; the mold core 701 comprises a first guide part 703 and a second guide part 704 which are arranged in a step manner, wherein the second guide part 704 is in a cylindrical structure, and the second guide part 704 axially extends into the mold cover 702; a plurality of third through holes 705 are arranged at the joint end surface of the first guide part 703 and the second guide part 704, and the plurality of third through holes 705 are arranged along the circumferential direction of the second guide part 704; meanwhile, an extrusion runner in conical arrangement is arranged in the die cover 702, and the die core 701 is at least partially penetrated in the extrusion runner; a fourth through hole 706 coaxially arranged with the second guiding part 704 is further arranged at one end of the extrusion flow passage, which is away from the mold core 701, and the inner diameter of the fourth through hole 706 is larger than the outer diameter of the second guiding part 704; a flow dividing plate 707 is further arranged in the extrusion flow passage, and the flow dividing plate 707 is sleeved on the periphery of the second guide part 704; the splitter plate 707 specifically includes a splitter portion radially disposed along the fourth through hole 706, where a fifth through hole 708 is formed in the splitter portion for passing the sheath 3 material; one end of the diversion portion abuts against the inner wall of the die cover 702, the other end of the diversion portion is connected with a narrowing portion, the narrowing portion is in a frustum shape, the inner diameter of the narrowing portion gradually reduces towards one end of the fourth through hole 706, and a gap is reserved between the narrowing portion and the outer wall surface of the second guiding portion 704.
Specifically, in the present application, the mold core 701 is first configured by a first guide portion 703 and a second guide portion 704, the inner periphery of the second guide portion 704 is used for passing the light unit 1, and a third through hole 705 is used for passing the reinforcing member 4 at the end face where the first guide portion 703 and the second guide portion 704 meet. The extrusion runner which is arranged in a conical shape in the die cover 702 is used for extruding and shearing the sheath 3 material so as to facilitate extrusion molding of the sheath 3; meanwhile, a flow dividing plate 707 is arranged in the extrusion flow passage, a gap between the mold core 701 and the mold cover 702 is used for extruding sheath 3 material, when the sheath 3 material enters the extrusion flow passage, the sheath 3 material is divided into two parts through a fifth through hole 708 on the flow dividing plate 707, one part flows at the gap between the narrowing part and the second guiding part 704, and the sheath 3 material is wrapped on the inner side and the outer side of the reinforcement 4 to form the sheath 3 on the inner side and the outer side of the reinforcement 4 respectively. At the same time, the structure in which the narrowed portion gradually narrows the plurality of reinforcing members 4 into a circular structure that abuts against each other. The gap between the narrowing part and the inner wall of the extrusion flow channel is used for extruding the material of the other part of sheath 3 to form the sheath 3 on the periphery of the reinforcing piece 4 so as to form the primary structure of the central tube type armored optical cable, and finally, the primary structure is vacuum sized and molded by a vacuum sizing mechanism 8.
It should be noted that, since the stiffener 4 of the present application needs to be twisted around the light unit 1, the mold core 701 also needs to be correspondingly rotated, and thus the mold core 701 is correspondingly connected with a rotating mechanism for driving the mold core 701 to rotate.
Specifically, the extrusion die inner sheath 3 in the application is formed by the following steps:
The light unit 1 is led into the first guide part 703 and the second guide part 704, the reinforcing member 4 is led along the third through hole 705, and the whole mold core 701 rotates synchronously with the rotating mechanism 6; the reinforcing member 4 is introduced into the mold cover 702 and from the inside of the flow dividing plate 707, and the light unit 1 is introduced into the fourth through hole 706 in the axial direction; extruding the sheath 3 material into an extrusion flow channel formed between the mold core 701 and the mold cover 702; a part of the sheath 3 is wrapped on the periphery of the reinforcing member 4 and enters the inside of the splitter plate 707, the reinforcing member 4 gradually contracts along with the narrowing of the splitter plate 707 to form an annular structure which is mutually abutted, and the sheath 3 is formed inside the reinforcing member 4; the other part of the sheath 3 material is extruded along with the outer side of the splitter 707, a sheath 3 structure is formed on the periphery of the reinforcing member 4, a central tube type armored structure with the sheath 3 synchronously arranged on the inner side and the outer side of the reinforcing member 4 is finally formed, then the combined structure of the optical unit 1, the reinforcing member 4 and the sheath 3 is jointly led into a vacuum sizing mechanism 8, and the formed central tube type armored optical cable is obtained through vacuum sizing and cooling forming through the vacuum sizing mechanism 8.
Further preferably, the production system further comprises corresponding marking equipment, detection equipment, traction stretching equipment, winding equipment and the like, so that the automatic production of the central tube type armored optical cable is realized.
According to the central tube type armored optical cable, the reinforcing piece 4 which is twisted by rotation and revolution is formed in the optical cable, and the torsion of the self-rotation and revolution of the reinforcing piece 4 is mutually counteracted, so that the optical cable structure is not damaged by the torsion of the reinforcing piece 4 in the production process of the optical cable, and the stable forming of the optical cable is ensured. Meanwhile, the twisting structure of the optical cable can form an armor structure in the optical cable so as to improve the anti-biting capacity of the optical cable; and the reinforcement 4 in a twisted arrangement is stretched on one side and contracted on the other side of the reinforcement 4 in one twisting pitch when the optical cable is bent, so that the problems that the reinforcement 4 on one side is stretched and the reinforcement 4 on the other side is contracted when the optical cable is bent are avoided, the integral bending performance of the optical cable is ensured, and the service life of the optical cable is prolonged.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A center tube armored fiber optic cable comprising:
The optical fiber cable comprises a sheath, wherein a hollow pipe structure is formed in the center of the sheath along the axial direction, and at least one optical unit is arranged in the hollow pipe structure;
the sheath is embedded with a plurality of reinforcing pieces along the circumferential direction of the hollow tube structure, the plurality of reinforcing pieces form an annular structure on the periphery of the light unit, and the peripheral wall surfaces of two adjacent reinforcing pieces are mutually abutted; the reinforcing piece is a high-modulus steel wire, and the modulus of the reinforcing piece is not lower than 170GPa;
each reinforcement piece is rotationally twisted along a first direction by a respective axle center; the plurality of reinforcing pieces are rotationally twisted along the second direction by the axis of the sheath;
And the first direction is opposite the second direction.
2. The center tube armored fiber optic cable of claim 1, wherein the strength members are stranded along the respective axes at a first lay pitch, wherein a plurality of the strength members are stranded along the jacket axes at a second lay pitch, and wherein the first lay pitch is not less than the second lay pitch.
3. The center tube armored fiber optic cable of claim 1, wherein the outer circumference of a plurality of strength members is coated with EAA film.
4. A method for preparing a center tube type armored cable as claimed in any one of claims 1 to 3, comprising the steps of:
A traction light unit;
A plurality of stiffeners are arranged outside the light unit Zhou Jiaoge with the light unit as a center;
rotating and twisting the reinforcing pieces along the first direction by respective axes; rotating and twisting the plurality of reinforcing pieces along a second direction by the axis of the sheath;
Co-introducing the light unit and the plurality of stiffeners into an extrusion die comprising a die core and a die cover coaxially sleeved; the light unit and the plurality of stiffeners are formed in the extrusion die in the following manner:
the light unit is led into the first guide part and the second guide part of the mold core, the reinforcement is led in along the third through hole of the mold core, and the mold core is driven to integrally rotate;
Extruding the sheath material into an extrusion runner between the mold core and the mold cover, wherein a part of the sheath material wraps the periphery of the reinforcing part and enters into a flow dividing plate of the mold cover, and the reinforcing part gradually contracts along with the narrowing of the flow dividing plate to form an annular structure which is mutually abutted so as to inject the sheath material into the reinforcing part; and extruding the other part of sheath material along with the outer side of the splitter plate so as to inject the sheath material into the periphery of the reinforcing piece, extruding and forming the sheath by adopting a vacuum sizing process, and forming to obtain the central tube type armored optical cable with the sheath synchronously arranged at the inner side and the outer side of the reinforcing piece.
5. The method of manufacturing a center tube armored fiber optic cable of claim 4, wherein the plurality of strength members are arranged in the following manner:
arranging a twisting mold in the inlet direction of the extrusion mold, reserving a through hole for the light unit to pass through in the center of the twisting mold, and circumferentially arranging a plurality of through holes for the reinforcing piece to pass through along the center of the twisting mold;
Introducing a light unit and a plurality of stiffeners into a stranding die;
The twisting mold drives the plurality of stiffeners to rotate around the respective axes, and the twisting mold synchronously drives the plurality of stiffeners to rotate around the optical unit.
6. A production system of a center tube type armored optical cable for production and preparation of the center tube type armored optical cable as claimed in any one of claims 1 to 3, characterized by comprising:
the first paying-off device is used for paying out the light unit;
a second pay-off device for paying out the reinforcement;
the stranding die is arranged along the paying-off direction of the first paying-off device;
the twisting mold comprises a reinforcement twisting cage and a rotating mechanism which are sequentially arranged along the paying-off direction;
The reinforcement winch cage and the rotating mechanism are provided with a first through hole for the light unit to pass through and a second through hole for a plurality of reinforcements to pass through, and the second through holes are circumferentially distributed on the periphery of the first through hole;
A first driving mechanism is arranged in the reinforcement cage and is attached to the inner wall of the second through hole so as to drive the plurality of reinforcements to automatically rotate in the second through hole; the rotating mechanism is provided with a second driving mechanism which is used for driving the reinforcing pieces to rotate around the light unit;
The extrusion die is arranged along the traction direction of the first paying-off device, and the extrusion die is arranged at the outlet end of the stranding die.
7. The system for producing a center tube type armored optical cable of claim 6, wherein the extrusion die comprises a vacuum sizing mechanism, the vacuum sizing mechanism comprises a cooling water tank, a plurality of vacuum copper tubes are axially distributed in the cooling water tank, the inner walls of the vacuum copper tubes are provided with adsorption holes, the vacuum copper tubes are connected with a negative pressure assembly, and gaps are reserved among the vacuum copper tubes.
8. The system for producing a center tube armored fiber optic cable of claim 6, wherein the extrusion die further comprises an extrusion mechanism, the extrusion mechanism being disposed at an outlet end of the stranding die;
the extruding mechanism comprises a die core and a die cover which are coaxially sleeved;
The mold core comprises a first guide part and a second guide part which are arranged in a stepped manner, the second guide part is of a cylindrical structure, and the second guide part axially stretches into the mold cover; a plurality of third through holes are formed in the joint end surface of the first guide part and the second guide part, and the third through holes are arranged along the circumferential direction of the second guide part;
An extrusion runner in conical arrangement is arranged in the die cover, and the die core is at least partially penetrated in the extrusion runner;
A fourth through hole which is coaxially arranged with the second guide part is formed in one end of the extrusion flow passage, which is away from the mold core, and the inner diameter of the fourth through hole is larger than the outer diameter of the second guide part;
a flow dividing plate is further arranged in the extrusion flow passage and sleeved on the periphery of the second guide part;
the flow dividing plate comprises a flow dividing part which is radially arranged along the fourth hole, and a fifth through hole for passing through the sheath material is formed in the flow dividing part;
One end of the flow dividing part is abutted against the inner wall of the die cover, the other end of the flow dividing part is connected with the narrowing part, the narrowing part is in a frustum shape, the inner diameter of the narrowing part gradually reduces towards one end of the fourth through hole, and a gap is reserved between the narrowing part and the outer wall surface of the second guiding part.
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| CN206489909U (en) * | 2017-03-09 | 2017-09-12 | 广州澳通电线电缆有限公司 | Cable-former |
| CN116224511A (en) * | 2021-12-04 | 2023-06-06 | 长飞光纤光缆股份有限公司 | FRP armored optical cable and preparation method thereof |
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| CN100386658C (en) * | 2005-10-31 | 2008-05-07 | 广州关键光电子技术有限公司 | Indoor optical cable and its production method |
| US7397992B1 (en) * | 2007-04-30 | 2008-07-08 | Corning Cable Systems Llc | Tubeless fiber optic cables having strength members and methods therefor |
| CN103487907B (en) * | 2013-09-29 | 2016-01-27 | 江苏通光海洋光电科技有限公司 | Optical cable for oil-gas pipeline same-hole back-dragging and special construction traction device thereof |
| CN107656342A (en) * | 2017-08-25 | 2018-02-02 | 江苏中天科技股份有限公司 | A kind of Novel anti-mouse stings optical cable and preparation method thereof |
| CN107797206B (en) * | 2017-11-30 | 2020-01-14 | 长飞光纤光缆股份有限公司 | Production equipment and production method of high-density optical fiber bundle micro-unit optical cable |
| CN116184588A (en) * | 2022-12-14 | 2023-05-30 | 长飞光纤光缆股份有限公司 | Armored structure reducing special optical cable and manufacturing method thereof |
| CN117420646A (en) * | 2023-01-05 | 2024-01-19 | 长飞光纤光缆股份有限公司 | Direct-buried optical cable, and manufacturing equipment and method thereof |
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| CN206489909U (en) * | 2017-03-09 | 2017-09-12 | 广州澳通电线电缆有限公司 | Cable-former |
| CN116224511A (en) * | 2021-12-04 | 2023-06-06 | 长飞光纤光缆股份有限公司 | FRP armored optical cable and preparation method thereof |
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