CN112649927A - Sheath, optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and method - Google Patents
Sheath, optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and method Download PDFInfo
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- CN112649927A CN112649927A CN202011599146.4A CN202011599146A CN112649927A CN 112649927 A CN112649927 A CN 112649927A CN 202011599146 A CN202011599146 A CN 202011599146A CN 112649927 A CN112649927 A CN 112649927A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
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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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- Optics & Photonics (AREA)
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention discloses a sheath, an optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and a method. The sheath includes the sheath body, the outside of sheath body still is provided with the horizontal bar that extends along sheath body length direction, the horizontal bar is the arris strip structure on the sheath body outer wall. The sheath, the optical cable air-blowing micro cable capable of increasing air-blowing distance, the processing equipment and the method provided by the scheme can effectively improve the air-blowing distance of the micro cable.
Description
Technical Field
The invention relates to the technical field of optical cables, in particular to a sheath, an optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and a method.
Background
In recent years, with the rapid development of communication services and new optical cable technologies, the requirements for laying optical cables are increasing. Because the existing pipeline resources are in short supply, the construction efficiency of the traditional laying mode is too low, and the laying process easily influences the service life of the optical cable, so that the air-blowing micro-cable technology plays an important role in the laying process of the optical cable.
The air-blown micro cable is used as an optical cable laying technology, and the structure of the obtained optical cable generally comprises an outer protection tube (a main tube), a micro tube (a sub tube) and a micro cable. In the specific laying technology, the micro-pipe can be blown into the outer protection pipe by using an air compressor and a pressure gas cylinder, and then a certain number of micro-cables can be blown into the micro-pipe under the action of blowing high-pressure gas into the micro-pipe according to specific requirements. Under the action of gas, the micro cable is suspended in the micro pipe and pushed forward by the gas, the micro cable is in a suspended state in the whole laying process, and the friction between the micro cable and the pipeline is greatly reduced; the micro cable is loosely parked in the pipeline and cannot be influenced by excessive external force, so that the capacity of the optical cable in the pipeline can be effectively increased by using the air-blowing micro cable technology to lay the optical cable; and after the pipeline is laid once, the required number of micro cables are blown in flexibly for multiple times as required in the future.
Further optimization of the optical cable preparation technology is undoubtedly significant for promoting development of the optical cable industry.
Disclosure of Invention
Aiming at the technical problems that the further optimization of the optical cable preparation technology is provided and the development of the optical cable industry is promoted, the invention provides the sheath, the optical cable air-blowing micro-cable capable of increasing the air-blowing distance, the processing equipment and the method.
The sheath, the optical cable air-blowing micro cable capable of increasing air-blowing distance, the processing equipment and the method solve the problems through the following technical key points that the sheath is used for preparing the micro cable and comprises a sheath body, the outer side of the sheath body is also provided with transverse strips extending along the length direction of the sheath body, and the transverse strips are rib structures on the outer wall of the sheath body.
In the prior art, the air-blowing micro cable is mature in application and has a plurality of advantages compared with the traditional micro cable laying. For air blown micro cables, the most important metrics are air blowing speed and air blowing distance. The friction between the outer sheath of the micro cable and the micro tube and the duty ratio of the micro cable in the micro tube are important factors influencing the laying efficiency of the air-blowing micro cable. The magnitude of the friction force depends on the contact area and the friction coefficient, the external force transmitted into the gas is reduced due to the overlarge friction force, and even the friction force and the external force of the gas are mutually offset seriously, so that the micro cable cannot be continuously pushed in the micro tube; the duty ratio of the micro cable is too large, which can cause the air flow speed to be reduced and is not beneficial to laying the micro cable. To the above problem, this scheme has adjusted the appearance of sheath. Specifically, the sheath is provided with a transverse bar extending along the sheath, when the air-blowing micro cable is used, the transverse bar forms the boundary of the outermost side of the sheath, and under the support of the end part of the transverse bar for the micro cable, the aim of reducing the friction force when the air-blowing micro cable is used is achieved by reducing the contact area; the existence of the transverse strips can increase the action area of the airflow on the outer surface of the sheath and improve the driving force provided by the airflow on the advance of the micro cable; the existence of the transverse strips can improve the duty ratio when the air blows the micro cable. Therefore, by adopting the means, the aim of effectively improving the air blowing distance of the micro cable can be finally achieved.
As a further technical scheme of the sheath for the micro cable:
for making in the circumferential direction of sheath, the horizontal bar can provide antifriction support for the micro cable in a plurality of circumferential position, makes simultaneously when implementing the air-blowing micro cable, and sheath circumferential direction air current is more even, reduces positive pressure and the effect opportunity between micro cable and the microtubule, further increase with the active area and the promotion duty cycle of air current, set up to: the number of the transverse strips is multiple; in the circumferential direction of the sheath body, the horizontal strips are arranged at intervals.
More perfect, for avoiding the atress inequality in the micro cable circumferential direction when implementing the air-blowing micro cable, set up to: the interval arrangement is annular and uniform.
In order to make when implementing the air-blowing micro cable, the force of gas effect on the horizontal bar can directly promote the micro cable and advance, has the component force that directly drives the micro cable and advances promptly, sets up as: the horizontal bar is in a spiral shape spirally rotating around the sheath body.
As a further technical solution of the above spiral bar, as described above, in consideration of the duty ratio, the action area, and the uniformity of the force applied in the circumferential direction, the spiral bar is set as: the number of the transverse strips is multiple; in the circumferential direction of the sheath body, the horizontal strips are uniformly distributed in an annular manner relative to the axis of the sheath body.
In order to reduce the energy loss of the airflow caused by the stirring of the crossbands to the airflow, the method is characterized in that: the side surface of the transverse bar is a smooth surface.
The scheme also provides a micro cable capable of increasing the air blowing distance, and the micro cable comprises the sheath provided by any one of the above items. This scheme provides one kind based on the application of sheath, when specifically using, the sheath that this scheme provided can obtain the micro cable that this scheme provided can effectively improve micro cable air-blowing distance in the outside preparation of cable core.
For the specific structural design of the micro cable, the following method is preferably adopted: the cable comprises a layer-stranded cable core twisted by SZ, a sheath wrapped on the outer side of the cable core, and a plastic sheath arranged between the cable core and the sheath, wherein the plastic sheath is wrapped on the outer side of the cable core and is used for providing a constraint force for keeping the twisting pitch for the cable core. The wall thickness of the plastic sheath is less than or equal to 0.15mm, and the plastic sheath is formed on the surface of the cable core in a blow molding mode after the cable core is subjected to SZ stranding. Because the plastic sheath is thinner than traditional sheath thickness, so its cooling shrink back can be used for the transposition pitch on the fixed cable core, avoids adopting current transposition pitch to prick yarn restraint and exists: in the sheath setting process, polymer yarn is heated shrink, in the micro cable use, and shrink, practical actual effect contract down naturally under the low temperature environment finally receive transitional extrusion, lead to the problem that optic fibre attenuation increases even fracture. Namely, the plastic sheath adopted in the optimized proposal replaces the prior binding yarn, which is beneficial to the performance and the service life of the micro cable.
Aiming at the sheath structure, the scheme also discloses sheath processing equipment for the micro cable, which comprises a forming device for preparing the sheath on the cable core, wherein the forming device comprises a die cover arranged on the outer side of the cable core port, an extrusion channel is enclosed between the cable core port and the die cover and is used for extruding the material for forming the sheath, and a groove connected with the pore channel is further arranged at the outlet end of the pore channel of the die cover. When this scheme was specifically used, as the technical staff in this field, there was the annular gap itself between mould lid and the cable core mouth. In the scheme, the groove connected with the annular gap is additionally arranged on the outer edge of the annular gap, so that the groove can be utilized to form a required transverse strip outside the sheath in the sheath preparation process.
As a further technical scheme of sheath processing equipment for the micro cable:
in order to obtain a transverse bar with a width of the connecting side (the side connected with the sheath) larger than the width of the free side (the side opposite to the connecting side), the transverse bar is provided with: the width of the groove becomes continuously smaller from the center to the outer side of the porthole in the radial direction of the porthole.
As a technical solution which has a simple structure and can obtain the spiral horizontal bar, the spiral horizontal bar is provided with: the cable core opening device further comprises a driving and rotating mechanism which is in transmission connection with the die cover and used for driving the die cover to rotate around the center of the cable core opening.
Simultaneously, this scheme still discloses a sheath processing method for the cable core: in the forming process of the sheath, by adopting: the outlet end of the mould cover pore canal for the sheath forming boundary constraint is provided with a groove connected with the pore canal, and a cross bar extending along the length direction of the sheath is obtained on the surface of the sheath. The scheme provides a cross bar which is integrally formed on the sheath by controlling the shape of the outlet of the extrusion material channel in the process of forming the sheath. The method is simple to operate, the sheath forming efficiency is high, the forming quality is good, and meanwhile, the sheath capable of effectively improving the air blowing distance of the micro cable can be obtained.
The invention has the following beneficial effects:
the appearance of sheath has been adjusted to this scheme. Specifically, the sheath is provided with a transverse bar extending along the sheath, when the air-blowing micro cable is used, the transverse bar forms the boundary of the outermost side of the sheath, and under the support of the end part of the transverse bar for the micro cable, the aim of reducing the friction force when the air-blowing micro cable is used is achieved by reducing the contact area; the existence of the transverse strips can increase the action area of the airflow on the outer surface of the sheath and improve the driving force provided by the airflow on the advance of the micro cable; the existence of the transverse strips can improve the duty ratio when the air blows the micro cable. Therefore, by adopting the means, the aim of effectively improving the air blowing distance of the micro cable can be finally achieved. Meanwhile, the scheme also provides the micro cable applying the sheath, equipment for producing the sheath and a corresponding processing method.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the micro-cable according to the invention, in cross section, particularly for showing the embodiment in which the crossbars extend parallel to the direction of extension of the cable core;
FIG. 2 is a schematic structural view of one embodiment of the micro-cable of the present invention, which is a cross-sectional view, particularly illustrating the implementation of the cross-bars extending helically along the extension direction of the cable core;
FIG. 3 is a side view of the structure shown in FIG. 2;
FIG. 4 is a schematic view of the configuration of the end of the micro-cable processing apparatus for obtaining a corresponding sheath, matching the configuration of FIG. 1;
FIG. 5 is a schematic view of the configuration of the end of the micro-cable processing apparatus for obtaining a corresponding sheath, matching the configuration of FIG. 2;
FIG. 6 is a cross-sectional view of the end of a particular tooling apparatus for preparing a corresponding sheath, matched to the sheaths provided herein.
The reference numbers in the figures are in order: 1. the cable comprises a cable core, 2, a plastic sheath, 3, a reinforcing core, 4, water-blocking yarns, 5, crossbands, 6, cable paste, 7, a sheath, 8, an extrusion port, 9, a cable core port, 10 and a mold cover.
Detailed Description
The present invention will be described in further detail with reference to examples, but the structure of the present invention is not limited to the following examples.
Example 1:
as shown in fig. 1 to 3, the sheath comprises a sheath body 7, a cross bar 5 extending along the length direction of the sheath body 7 is further disposed on the outer side of the sheath body 7, and the cross bar 5 is a rib structure on the outer wall of the sheath body 7.
In the prior art, the air-blowing micro cable is mature in application and has a plurality of advantages compared with the traditional micro cable laying. For air blown micro cables, the most important metrics are air blowing speed and air blowing distance. The friction between the outer sheath of the micro cable and the micro tube and the duty ratio of the micro cable in the micro tube are important factors influencing the laying efficiency of the air-blowing micro cable. The magnitude of the friction force depends on the contact area and the friction coefficient, the external force transmitted into the gas is reduced due to the overlarge friction force, and even the friction force and the external force of the gas are mutually offset seriously, so that the micro cable cannot be continuously pushed in the micro tube; the duty ratio of the micro cable is too large, which can cause the air flow speed to be reduced and is not beneficial to laying the micro cable. To the above problem, this scheme has adjusted the appearance of sheath. Specifically, the sheath is provided with a transverse bar 5 extending along the sheath, when the air-blowing micro cable is used, the transverse bar 5 forms the boundary of the outermost side of the sheath, and under the support of the end part of the transverse bar 5 on the micro cable, the purpose of reducing the friction force when the air-blowing micro cable is used is achieved by reducing the contact area; the existence of the transverse strips 5 can increase the action area of the airflow on the outer surface of the sheath and improve the driving force provided by the airflow on the advance of the micro cable; the presence of the above cross bars 5 can improve the duty cycle when blowing the micro-cable. Therefore, by adopting the means, the aim of effectively improving the air blowing distance of the micro cable can be finally achieved.
Example 2:
as shown in fig. 1 to 3, the present embodiment is further defined on the basis of embodiment 1: for making in the circumferential direction of sheath, horizontal bar 5 can provide antifriction support for the micro cable in a plurality of circumferential position, makes simultaneously when implementing the air-blowing micro cable, and sheath circumferential direction air current is more even, reduces positive pressure and the effect opportunity between micro cable and the microtubule, further increase with the effect area and the promotion duty cycle of air current, set up to: the number of the transverse strips 5 is multiple; in the circumferential direction of the jacket body 7, the cross bars 5 are arranged at intervals.
More perfect, for avoiding the atress inequality in the micro cable circumferential direction when implementing the air-blowing micro cable, set up to: the interval arrangement is annular and uniform.
Example 3:
as shown in fig. 2 and fig. 3, the present embodiment is further defined on the basis of embodiment 1: in order to make the force of the gas acting on the horizontal bar 5 directly push the micro cable to advance when the air blowing micro cable is implemented, namely the component force directly driving the micro cable to advance is provided with: the horizontal bar 5 is spiral-shaped and spirally rotates around the sheath body 7.
As a further technical solution of the above spiral-shaped horizontal bar 5, as described above, in consideration of the duty ratio, the acting area, and the uniformity of the force applied in the circumferential direction, the following are provided: the number of the transverse strips 5 is multiple; in the circumferential direction of the sheath body 7, the cross bars 5 are annularly and uniformly distributed relative to the axis of the sheath body 7.
Example 4:
as shown in fig. 1 to 3, the present embodiment is further defined on the basis of embodiment 1: in order to reduce the energy loss of the air flow caused by the agitation of the air flow by the crossbars 5, the following steps are set: the side surface of the transverse strip 5 is a smooth surface.
Example 5:
as shown in fig. 1 to 3, the present embodiment provides a micro cable including the sheath provided in any one of the above embodiments. This scheme provides one kind based on the application of sheath, when specifically using, the sheath that this scheme provided can obtain the micro cable that this scheme provided can effectively improve micro cable air-blowing distance in the outside preparation of cable core 1.
For the specific structural design of the micro cable, the following method is preferably adopted: the cable comprises a layer-stranded cable core 1 stranded by SZ, a sheath wrapped on the outer side of the cable core 1, and a plastic sheath 2 arranged between the cable core 1 and the sheath, wherein the plastic sheath 2 is wrapped on the outer side of the cable core 1, and the plastic sheath 2 is used for providing a constraint force for keeping a stranding pitch for the cable core 1. The wall thickness of the plastic sheath 2 is less than or equal to 0.15mm, and the plastic sheath is formed on the surface of the cable core 1 in a blow molding mode after the cable core 1 finishes SZ stranding. Because plastic sheath 2 is compared in traditional sheath thickness thinner, so its cooling shrink back can be used for the transposition pitch on the fixed cable core 1, avoids adopting current transposition pitch to prick yarn restraint and exists: in the sheath setting process, polymer yarn is heated shrink, in the micro cable use, and shrink, practical actual effect contract down naturally under the low temperature environment finally receive transitional extrusion to the cable core 1 that leads to that optic fibre attenuation increases the cracked problem even. Namely, the plastic sheath 2 is adopted to replace the prior binding yarn in the preferred scheme, which is beneficial to the performance and the service life of the micro cable.
Example 6:
as shown in fig. 4 to 6, in this embodiment, on the basis of the above sheath embodiment, for the sheath structure proposed above, a sheath processing apparatus for a micro cable is provided, which includes a forming device for preparing a sheath on a cable core 1, where the forming device includes a die cover 10 disposed outside a cable core port 9, an extrusion channel is defined between the cable core port 9 and the die cover 10, the extrusion channel is used for extruding a material forming the sheath, and an outlet end of a duct of the die cover 10 is further provided with a groove connected to the duct. When the cable is used specifically, as a person skilled in the art, an annular gap exists between the die cover 10 and the cable port 9. In the scheme, the groove connected with the annular gap is additionally arranged on the outer edge of the annular gap, so that the groove can be utilized to form the required transverse strip 5 outside the sheath in the sheath preparation process.
Example 7:
this example is further defined on the basis of example 6: to obtain a transverse bar 5 with a width of the connecting side (the side in contact with the sheath) greater than the width of the free side (the side opposite the connecting side), provision is made for: the width of the groove becomes continuously smaller from the center to the outer side of the porthole in the radial direction of the porthole.
As a technical solution which has a simple structure and can obtain the spiral-shaped horizontal bar 5 as described above, the following arrangement is provided: the cable core connector further comprises a driving and rotating mechanism which is in transmission connection with the die cover 10 and is used for driving the die cover 10 to rotate around the center of the cable core port 9.
Example 8:
the embodiment provides a sheath processing method for a cable core 1, which comprises the following steps: in the forming process of the sheath, by adopting: at the outlet end of the porthole of the die cover 10 for jacket forming boundary constraint, a groove is arranged to be connected with the porthole, and a cross bar 5 extending along the length direction of the jacket is obtained on the surface of the jacket. The scheme provides the transverse strip 5 which is integrally formed on the sheath by controlling the shape of the outlet of the extrusion material channel in the process of forming the sheath. The method is simple to operate, the sheath forming efficiency is high, the forming quality is good, and meanwhile, the sheath capable of effectively improving the air blowing distance of the micro cable can be obtained.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the specific embodiments of the present invention be limited to these descriptions. For those skilled in the art to which the invention pertains, other embodiments that do not depart from the gist of the invention are intended to be within the scope of the invention.
Claims (10)
1. The sheath comprises a sheath body (7), and is characterized in that transverse strips (5) extending along the length direction of the sheath body (7) are further arranged on the outer side of the sheath body (7), and the transverse strips (5) are rib structures on the outer wall of the sheath body (7).
2. A sheath according to claim 1, characterized in that the number of said bars (5) is a plurality; in the circumferential direction of the sheath body (7), the transverse strips (5) are arranged at intervals.
3. A sheath according to claim 2 wherein the spaced arrangement is equispaced annularly.
4. A sheath according to claim 1, characterized in that the cross-bar (5) is helical in rotation around the sheath body (7).
5. A sheath according to claim 4, characterized in that the number of said bars (5) is a plurality; in the circumferential direction of the sheath body (7), the transverse strips (5) are uniformly distributed in a ring shape relative to the axis of the sheath body (7).
6. A sheath according to any one of claims 1 to 5, characterized in that the lateral surfaces of the cross-bars (5) are smooth.
7. Optical cable air-blown micro-cable with increased air-blowing distance, characterized in that it comprises a sheath as provided in any one of claims 1 to 6.
8. Sheath processing equipment comprises a forming device for preparing a sheath on a cable core (1), wherein the forming device comprises a die cover (10) arranged on the outer side of a cable core port (9), an extrusion channel is enclosed between the cable core port (9) and the die cover (10), the extrusion channel is used for extruding a material for forming the sheath, and the sheath processing equipment is characterized in that a groove connected with a pore channel is further arranged at the outlet end of the pore channel of the die cover (10).
9. The jacket processing apparatus according to claim 8, wherein the width of the groove becomes continuously smaller from the center to the outer side of the porthole in a radial direction of the porthole; the cable core connector further comprises a driving and rotating mechanism which is in transmission connection with the die cover (10) and is used for driving the die cover (10) to rotate around the center of the cable core port (9).
10. The sheath processing method is characterized in that in the sheath forming process, the following steps are adopted: at the outlet end of the duct of the mould cover (10) for the jacket forming boundary constraint, a groove is arranged to be connected with the duct, and a cross bar (5) extending along the length direction of the jacket is obtained on the surface of the jacket.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599146.4A CN112649927A (en) | 2020-12-29 | 2020-12-29 | Sheath, optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011599146.4A CN112649927A (en) | 2020-12-29 | 2020-12-29 | Sheath, optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and method |
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| CN112649927A true CN112649927A (en) | 2021-04-13 |
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| CN202011599146.4A Pending CN112649927A (en) | 2020-12-29 | 2020-12-29 | Sheath, optical cable air-blowing micro cable capable of increasing air-blowing distance, processing equipment and method |
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| CN111596427A (en) * | 2020-05-29 | 2020-08-28 | 江苏中天科技股份有限公司 | Air-blowing micro cable and preparation method thereof |
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|---|---|---|---|---|
| KR100628604B1 (en) * | 2004-03-02 | 2006-09-26 | 엘에스전선 주식회사 | Structure of Air Blown Optical Fiber ? Manufacturing Method and apparatus thereof |
| CN2916864Y (en) * | 2006-06-14 | 2007-06-27 | 浙江富春江通信集团有限公司 | Composite optical/electric cable |
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| CN111596427A (en) * | 2020-05-29 | 2020-08-28 | 江苏中天科技股份有限公司 | Air-blowing micro cable and preparation method thereof |
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Application publication date: 20210413 |