CN101887779A - Low-loss broadcasting coaxial cable and manufacturing method thereof - Google Patents
Low-loss broadcasting coaxial cable and manufacturing method thereof Download PDFInfo
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- CN101887779A CN101887779A CN 201010211220 CN201010211220A CN101887779A CN 101887779 A CN101887779 A CN 101887779A CN 201010211220 CN201010211220 CN 201010211220 CN 201010211220 A CN201010211220 A CN 201010211220A CN 101887779 A CN101887779 A CN 101887779A
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Abstract
The invention relates to a low-loss broadcasting coaxial cable which comprises an inner conductor, an insulation layer, an outer conductor and a jacket, wherein the insulation layer adopts a skin-foam-skin three-layer structure formed by carbon dioxide foaming, and the outer conductor is formed by metal band welding fabrication. The broadcasting coaxial cable has the characteristics of low loss, high shielding performance, favorable bending properties and water and corrosion resistance, simple structure and convenient installation, and can be used in a broadband communication network in China to transmit video entertainment information and carry out interaction on video data and voice information, thereby having favorable generalization value.
Description
Technical field
The present invention relates to a kind of broadcast singal transmission coaxial-cable of wireless communication technology field.
Background technology
Broadcasting coaxial cable is a kind of cable that is used to transmit broadcasting video data and voice messaging, and it is a kind of of transmission line.So-called transmission line is made up of signal path and return path, between two paths distributed capacitance and distributed inductance is arranged, and two values of the characteristic impedance of transmission line and this are relevant.Common broadcasting coaxial cable has 75 ohm coaxial cable, 75 ohm of characteristic impedances that are meant coaxial cable.Existing broadcasting coaxial cable mainly is made up of inner wire, insulating barrier, outer conductor and sheath, wherein, insulating barrier is to insulate by nitrogen gas foaming, outer conductor mainly is made up of one deck braided wires and vertical clad metal paper tinsel, it has relative higher dielectric constant, influences the signal transmission performance of cable, shows that loss of signal is big, shielding properties is poor, waterproof and dampproof poor performance, the installation of cable and connector simultaneously is complicated.
Along with the increase in demand of people to video data and voice messaging, HFC cable TV broadband communication network arises at the historic moment, and HFC is the abbreviation of Hybrid Fiber-Coaxial, and hfc plant is the hybrid network that optical fiber and coaxial cable combine.Hfc plant is made up of fiber optic backbone, coaxial cable branch line and subscriber distribution network network three parts usually, and the programme signal of coming out from cable TV station becomes light signal earlier and transmits at main line; Behind the user area, light signal is converted to the signal of telecommunication, after distributor distributes, deliver to the user by coaxial cable.It mainly is with the difference of early stage CATV coax network, use optical signal transmission fiber on main line, need finish the electrical-optical conversion at front end, will finish the conversion of light-electricity after entering the user area.And above-mentioned coaxial cable has been not suitable for the transmission of high-quality signal in HFC cable TV broadband communication network, and the application just is being based on above-mentioned purpose and the design carried out.
Summary of the invention
The present invention seeks to provide the broadcasting coaxial cable and the manufacture method thereof of a kind of low-loss, high shielding, assurance signal reliable transmission in order to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution used in the present invention is: a kind of low-loss broadcasting coaxial cable, comprise inner wire, be extruded in the inner wire periphery insulating barrier, be coated on the insulating barrier periphery outer conductor, be extruded in the sheath of outer conductor periphery, described insulating barrier is made up of for three layers skin-bubble-Pi, it is followed successively by the insulation endodermis mutually bonding with described inner wire, insulation foaming layer, is used to prevent that outside moisture content moisture from entering the insulation sheath layer in the insulating barrier that described outer conductor is tubular vertical wrapping on the described insulating barrier by the metal tape welding from the inside to the outside.
Further, described outer conductor is axially gone up the rolling uniform annular line that has along it.
Described outer conductor is by copper strips or aluminium strip welding fabrication.
The present invention also provides a kind of method of making above-mentioned low-loss broadcasting coaxial cable, and it comprises the steps:
(a), inner wire is carried out radio-frequency preheating;
(b), in the conductor extrude leather material in the skim insulation, after the cooling, leather material is bonded at and forms described insulation endodermis on the inner wire in the insulation;
(c), with insulating foaming material and the coextrusion of insulation sheath materials double-layer to be coated on the insulation endodermis, form described insulation foaming layer and insulation sheath layer respectively;
(d), with metal tape through U type Slot shaping after vertical bag be welded on outside the insulation sheath layer, form described outer conductor;
(e), at last on outer conductor, extrude one deck protective cover material again, form described sheath.
Further, in the step (c), described insulating foaming material is realized by following steps:
(c1), with high density polyethylene (HDPE), low density polyethylene (LDPE) and nucleator mixed melting at high temperature;
(c2), carbon dioxide is injected above-mentioned melt mixed material by high pressure;
(c3), through the series connection two plastic extruding machines in screw rod evenly mix, extrude by head then.
After step (d), also comprise one with outer conductor along its axially rolled step that circularizes line.
In the step (c), insulating barrier and insulation sheath layer are by Re-Wen-cold staged water cooling moulding.
Because the utilization of technique scheme, the present invention compared with prior art has following advantage: coaxial cable of the present invention has low-loss, high shielding, also have the good bending property and the characteristics of waterproof anti-corrosion, simple in structure, easy for installation, can in the broadband communication network of China, use, not only can the transmission of video amusement in this network, but also can carry out the mutual of video data and voice messaging, have excellent popularization and be worth.
Description of drawings
Accompanying drawing 1 be according to technical solution of the present invention the concrete axial schematic diagram of implementing of broadcasting coaxial cable;
Accompanying drawing 2 is an A-A direction cutaway view among Fig. 1;
Wherein: 1, inner wire 2, insulating barrier 21, insulation endodermis 22, insulation foaming layer 23, insulation sheath layer 3, outer conductor 4, sheath;
Embodiment
Below in conjunction with accompanying drawing, describe particular content of the present invention in detail for example:
Coaxial cable as depicted in figs. 1 and 2, it is mainly used in transmission broadcasting video data and voice messaging, it comprises inner wire 1 from the inside to the outside successively, insulating barrier 2, outer conductor 3, sheath 4, wherein, inner wire 1 adopts transmission performance copper or copper-clad aluminum conductor preferably, insulating barrier 2 is made up of for three layers skin-bubble-Pi, be that it is from the inside to the outside successively by insulation endodermis 21, insulation foaming layer 22 and insulation sheath layer 23 are formed, described insulation endodermis 21 is bonding with inner wire 1, it is mainly used in and prevents inner wire 1 longitudinal extension with variation of ambient temperature, insulation foaming layer 22 is extruded on the insulation endodermis 21, it prevents from vertically to enter and influence signal transmission quality at the longitudinal extension of insulating barrier center and moisture content moisture with the variation of ambient temperature inner wire, insulation sheath layer 23 is extruded in the insulation foaming layer 22, thereby it is mainly used in and prevents that outside moisture content moisture from entering the inner signal transmission quality that influences of insulating barrier.
Sheath 4 adopts high-density polyethylene materials to make, and it has hardness height, resistance to wear is good, physical and mechanical properties is good advantage, has and has excellent toughness, advantages such as resistance to bend(ing), low temperature resistant embrittlement performance.
The coaxial cable of above structure is applicable to that mainly impedance operator is 75 ohm a coaxial cable, but can not therefore limit protection scope of the present invention.
Above-mentioned to the present invention concrete a kind of coaxial cable structure of implementing introduce, will describe its manufacture method below:
During fabrication, at first choose inner wire, to outside it, extrude leather material in the skim insulation earlier behind the inner wire 1 logical radio-frequency preheating, the optional polyethylene of using of leather material in this insulation, leather material is bonded at and forms insulation endodermis 21 on the inner wire 1 in supercooling makes insulation then, again through bi-layered device coextrusion insulation foaming layer 22, polyethylene sheath layer 23.
Wherein, the formation of insulation foaming layer 22 mainly is that three kinds of material high density polyethylene (HDPE)s, low density polyethylene (LDPE) and nucleator mix under the temperature about 200 degree earlier, then the carbon dioxide high pressure is injected batch mixing, batch mixing is evenly stirred, it is mixed, the honeycomb abscess that under the inducing of nucleator, forms, extrude through the tandem extrusion machine then and form insulation foaming layer 22, this insulation foaming layer and insulation sheath double-layer coextrusion go out to be coated on insulation endodermis surface, and be overheated then-Wen-cold staged water cooling moulding.Insulation foaming layer 22 abscesses are even, and dielectric loss is little, squeeze skim high density polyethylene (HDPE) insulation sheath in its outside then, make to have prevented that moisture content moisture from entering by whole insulating barrier smooth outer surface.
Then vertical bag behind metal tape (copper or aluminium) the process U type Slot shaping is welded on the insulating barrier 2 outer outer conductors 3 that form, again outer conductor 3 is rolled into annular line.Outer conductor 3 adopts the argon arc welding welding and is rolled into the closed ring conductor, is fixed on around the insulating barrier 2, has guaranteed the coaxial configuration that cable is stable, has good bending property and signal shielding performance, and waterproof and dampproof function.
The last layer of polyethylene protective cover material that extrudes again in the outside of outer conductor 3 forms sheath 4, promptly makes broadcasting coaxial cable of the present invention.
Coaxial cable of the present invention has the characteristic of low-loss, high shielding characteristic, and long service life has lower temperature resistance, and resistance to wear and ultraviolet radiation resisting performance characteristics can be used at China's all regions.
Claims (10)
1. low-loss broadcasting coaxial cable, comprise inner wire (1), be extruded in the insulating barrier (2) of inner wire (1) periphery, be coated on the outer conductor (3) of insulating barrier (2) periphery, be extruded in the sheath (4) of outer conductor (3) periphery, it is characterized in that: described insulating barrier (2) is made up of for three layers skin-bubble-Pi, it is followed successively by the insulation endodermis (21) mutually bonding with described inner wire (1) from the inside to the outside, insulation foaming layer (22), be used to prevent that outside moisture content moisture from entering the insulation sheath layer (23) in the insulating barrier (2), described outer conductor (3) is tubular vertical wrapping on the described insulating barrier (2) by the metal tape welding.
2. low-loss broadcasting coaxial cable according to claim 1 is characterized in that: described outer conductor (3) is axially gone up the rolling uniform annular line that has along it.
3. low-loss broadcasting coaxial cable according to claim 1 is characterized in that: described outer conductor (3) is by copper strips or aluminium strip welding fabrication.
4. low-loss broadcasting coaxial cable according to claim 1 is characterized in that: described sheath (4) adopts high-density polyethylene material to make.
5. low-loss broadcasting coaxial cable according to claim 1 is characterized in that: described inner wire (1) is copper or copper-clad aluminum conductor.
6. according to the arbitrary described low-loss broadcasting coaxial cable of claim 1～5, it is characterized in that: described coaxial cable is 75 ohm coaxial cable.
7. method of making the described low-loss broadcasting coaxial cable of claim 1, it is characterized in that: it comprises the steps:
(a), inner wire (1) is carried out radio-frequency preheating;
(b), on inner wire (1), extrude leather material in the skim insulation, after the cooling, leather material is bonded at inner wire (1) and goes up formation described insulation endodermis (21) in the insulation;
(c), with insulating foaming material and the coextrusion of insulation sheath materials double-layer to be coated on the insulation endodermis (21), form described insulation foaming layer (22) and insulation sheath layer (23) respectively;
(d), with metal tape through U type Slot shaping after vertical bag be welded on outside the insulation sheath layer (23), form described outer conductor (3);
(e), on outer conductor (3), extrude one deck protective cover material more at last, form described sheath (4).
8. low-loss broadcasting coaxial cable manufacture method according to claim 7 is characterized in that: in the step (c), described insulating foaming material is extruded by following steps and is realized:
(c1), with high density polyethylene (HDPE), low density polyethylene (LDPE) and nucleator mixed melting at high temperature;
(c2), carbon dioxide is injected above-mentioned melt mixed material by high pressure;
(c3), through the series connection two plastic extruding machines in screw rod evenly mix, extrude by head then.
9. low-loss broadcasting coaxial cable manufacture method according to claim 7 is characterized in that: after step (d), also comprise one with outer conductor (3) along its axially rolled step that circularizes line.
10. low-loss broadcasting coaxial cable manufacture method according to claim 7 is characterized in that: in the step (c), insulating barrier (2) is by Re-Wen-cold staged water cooling moulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010211220 CN101887779A (en) | 2010-06-28 | 2010-06-28 | Low-loss broadcasting coaxial cable and manufacturing method thereof |
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| CN 201010211220 CN101887779A (en) | 2010-06-28 | 2010-06-28 | Low-loss broadcasting coaxial cable and manufacturing method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222545A (en) * | 2011-06-22 | 2011-10-19 | 珠海宇讯同轴电缆有限公司 | Coaxial cable and production process thereof |
| CN102361147A (en) * | 2011-10-10 | 2012-02-22 | 中天日立射频电缆有限公司 | Flexible type radio-frequency coaxial cable of smooth aluminum tube external conductor and production method thereof |
| CN102751038A (en) * | 2012-06-27 | 2012-10-24 | 南京波腾科技工程有限公司 | Coaxial shielded wire |
| CN103021579A (en) * | 2012-12-25 | 2013-04-03 | 浙江德通科技有限公司 | Method for producing braided cable |
| CN103123818A (en) * | 2013-03-19 | 2013-05-29 | 河北华通线缆集团有限公司 | Multilayer protective low-smoke zero-halogen flame retardant fireproof control cable and manufacture method thereof |
| CN103943270A (en) * | 2014-04-10 | 2014-07-23 | 江苏通光电子线缆股份有限公司 | Novel microwave cable and preparing method thereof |
| CN106340703A (en) * | 2016-11-16 | 2017-01-18 | 江苏亨鑫科技有限公司 | High-isolation triple-coaxial leaky coaxial cable |
| CN107819178A (en) * | 2017-11-06 | 2018-03-20 | 江苏亨鑫科技有限公司 | A kind of special super soft Lowloss coaxial cables of 5G frequency ranges and preparation method thereof |
| CN108878018A (en) * | 2018-06-20 | 2018-11-23 | 浙江天杰实业股份有限公司 | A kind of high-performance Aluminum Tube Coaxial Cable and preparation method thereof |
| CN110323003A (en) * | 2019-07-20 | 2019-10-11 | 上海广茂特种线缆有限公司 | A kind of solid-core polyfluortetraethyleinsulating insulating low noise coaxial radio frequency cable |
| CN110459350A (en) * | 2019-08-02 | 2019-11-15 | 上海福尔欣线缆有限公司 | A kind of the coaxial data cable and manufacturing method of Vehicular intelligent control loop |
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| CN101136264A (en) * | 2006-08-29 | 2008-03-05 | 珠海汉胜工业有限公司 | Co-axial cable and method for making internally shallow layer thereof |
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| CN2525649Y (en) * | 2001-06-05 | 2002-12-11 | 黄叙银 | Coaxial cable |
| CN2521719Y (en) * | 2002-01-10 | 2002-11-20 | 江苏亨通线缆有限公司 | Ultra flexible coaxial electric cable |
| CN101136264A (en) * | 2006-08-29 | 2008-03-05 | 珠海汉胜工业有限公司 | Co-axial cable and method for making internally shallow layer thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222545A (en) * | 2011-06-22 | 2011-10-19 | 珠海宇讯同轴电缆有限公司 | Coaxial cable and production process thereof |
| CN102361147A (en) * | 2011-10-10 | 2012-02-22 | 中天日立射频电缆有限公司 | Flexible type radio-frequency coaxial cable of smooth aluminum tube external conductor and production method thereof |
| CN102361147B (en) * | 2011-10-10 | 2013-10-23 | 中天日立射频电缆有限公司 | Flexible type radio-frequency coaxial cable of smooth aluminum tube external conductor and production method thereof |
| CN102751038A (en) * | 2012-06-27 | 2012-10-24 | 南京波腾科技工程有限公司 | Coaxial shielded wire |
| CN103021579A (en) * | 2012-12-25 | 2013-04-03 | 浙江德通科技有限公司 | Method for producing braided cable |
| CN103123818B (en) * | 2013-03-19 | 2015-03-25 | 河北华通线缆集团有限公司 | Multilayer protective low-smoke zero-halogen flame retardant fireproof control cable and manufacture method thereof |
| CN103123818A (en) * | 2013-03-19 | 2013-05-29 | 河北华通线缆集团有限公司 | Multilayer protective low-smoke zero-halogen flame retardant fireproof control cable and manufacture method thereof |
| CN103943270A (en) * | 2014-04-10 | 2014-07-23 | 江苏通光电子线缆股份有限公司 | Novel microwave cable and preparing method thereof |
| CN103943270B (en) * | 2014-04-10 | 2017-11-03 | 江苏通光电子线缆股份有限公司 | A kind of microwave cable and preparation method thereof |
| CN106340703A (en) * | 2016-11-16 | 2017-01-18 | 江苏亨鑫科技有限公司 | High-isolation triple-coaxial leaky coaxial cable |
| CN107819178A (en) * | 2017-11-06 | 2018-03-20 | 江苏亨鑫科技有限公司 | A kind of special super soft Lowloss coaxial cables of 5G frequency ranges and preparation method thereof |
| CN108878018A (en) * | 2018-06-20 | 2018-11-23 | 浙江天杰实业股份有限公司 | A kind of high-performance Aluminum Tube Coaxial Cable and preparation method thereof |
| CN110323003A (en) * | 2019-07-20 | 2019-10-11 | 上海广茂特种线缆有限公司 | A kind of solid-core polyfluortetraethyleinsulating insulating low noise coaxial radio frequency cable |
| CN110459350A (en) * | 2019-08-02 | 2019-11-15 | 上海福尔欣线缆有限公司 | A kind of the coaxial data cable and manufacturing method of Vehicular intelligent control loop |
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Application publication date: 20101117 |