CN101404350B - Broad band radiation type leak coaxial cable for subway and its production method - Google Patents
Broad band radiation type leak coaxial cable for subway and its production method Download PDFInfo
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- CN101404350B CN101404350B CN 200810235151 CN200810235151A CN101404350B CN 101404350 B CN101404350 B CN 101404350B CN 200810235151 CN200810235151 CN 200810235151 CN 200810235151 A CN200810235151 A CN 200810235151A CN 101404350 B CN101404350 B CN 101404350B
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Abstract
The invention relates to a broadband radial pattern leaky coaxial cable used for subway and a manufacturing method thereof, and the leaky coaxial cable has the double functions of transmission line of information and duplexer. The structure of the leaky coaxial cable consists of an inner conductor, an insulation layer, an outer conductor and a jacket, wherein, the inner conductor is externally covered with the insulation layer which is externally covered with the outer conductor that is externally sheathed with the jacket, and the insulation layer that covers on the surface of the inner conductor adopts nitrogen or carbon dioxide physical foam to form a foamed polyethylene insulation layer; cambered slotted holes are opened on a clutch gold belt of the outer conductor covered outside the insulation layer. The manufacturing method comprises the steps: (1) a spiral wrinkle inner conductor is manufactured by longitudinal covering welding and embossing by using a copper strip; (2) the nitrogen or the carbon dioxide are adopted to be injected into the smelted polyvinyl plastics, and then the physical foamed polyethylene insulation layer is formed on the surface of the inner conductor by extrusion and cladding; (3) the slotted holes broken out by the clutch gold belt of the outer conductor are the cambered slotted holes; (4) the clutch gold belt of the outer conductor is covered on the insulation layer longitudinally, and the surface of the clutch gold belt of the outer conductor is crowded and covered with the jacket.
Description
Technical field
What the present invention relates to is a kind of broad band radiation type leak coaxial cable for subway and preparation method thereof, has the dual-use function of transmission line of information and dual-mode antenna.Be specifically designed to subway tunnel wireless shrouding system such as Tetra, public security fire-fighting, GSM, TD-SCDMA etc.
Background technology
Mobile communication was through the development in more than 10 years, and for users, the whole mobile communications network of active demand reaches high speed seamless coverage whenever and wherever possible.Along with information communication, multimedia wideling popularize, people also have higher requirement to business, wish to have the selection of multiple business, the expectation of high-speed data service movement requirement is also more and more higher, the function of 3G is the application of high-speed data and multimedia service, and the high speed data services such as visual telephone, video flowing, game all occur in the indoor environment, indoor in current city, such as occasions such as subway, building, underground parkings, complex structure, the electromagnetic wave signal of outside are difficult to transmission and come in.The indoor comprehensive soverlay technique is a kind of effective measures that solve indoor seamless communication, also is the key technology of promoting as China 3G high-speed data service at present, and the traffic carrying capacity 90% of adding up TD-SCDMA according to authority occurs in indoor.
Indoor covering is exactly in indoor construction wireless network transmission system, the complete system of a cover such as transmission, transmission and reception that comprises indoor signal, current indoor environment is comparatively complicated, the one, 2G and 3G together multiple types exist simultaneously, signal such as GSM, CDMA, TD-SCDMA, WCDMA, CDMA2000 etc. and relevant public security fire-fighting system can be simultaneously in indoor propagation, indoor covering design is had higher requirement, need to solve the critical problems such as covering, interference and capacity.The scheme of present indoor covering has several, such as antenna+feeder line wiring system scheme and leaky cable antenna wiring system scheme.The scheme of antenna+feeder line exists and covers incomplete defective, particularly in the tunnel, subway, etc. relative narrow zone, the size of antenna is subject to strict restriction, causes antenna gain can't reach the needs that field intensity covers.Broad band radiation type leak coaxial cable for subway has the advantages such as interference is little, capacity large, the field intensity covering is even, designs for the subway tunnel environment specially, satisfies the demand of subway 2G, 3G wireless coverage fully.
Summary of the invention
A kind of broad band radiation type leak coaxial cable for subway that provides for above-mentioned weak point and preparation method thereof is provided, it is broadband radiation type leaky coaxial cable of a kind of subway tunnel special use and preparation method thereof, have disturb little, capacity large, field intensity covers uniform characteristics, design for the subway tunnel environment specially, through the analogue test for metro environment, satisfy the demand of subway 2G, the covering of 3G WiMAX fully.
Broad band radiation type leak coaxial cable for subway and preparation method thereof is to take following scheme to realize: broad band radiation type leak coaxial cable for subway is comprised of inner wire, insulating barrier, outer conductor and sheath, at inner wire outer cladding insulating barrier, be coated with outer conductor at insulating barrier, at the outer conductor overcoat sheath is housed, it is characterized in that adopting purity at the surface coated insulating barrier of inner wire is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seals mutually; Outer conductor Copper Foil band in the insulating barrier outer cladding has arc-shaped slot, and the flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm.
Described inner wire adopts copper strips to consist of spirality wrinkle inner wire through being welded into copper pipe by embossing; Described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to consist of; Described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
Broad band radiation type leak coaxial cable for subway is owing to being 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier through purity at the surface coated insulating barrier of inner wire, has uniform foaming pore and electric property preferably.Because the outer conductor Copper Foil band in the insulating barrier outer cladding has arc-shaped slot, slotted eye by this novel uniqueness, a part of electromagnetic energy of transmission can be sent to external environment in the cable, equally, outside energy also can be passed to cable inside by this slotted eye, such structure just can realize at cable the function of receiving and transmitting signal, the function of current collection cable, antenna is in one, the grooved of this kind structure is suitable for the subway tunnel environment, have the characteristics such as electromagnetic wave is concentrated relatively on the radiation direction, field intensity is even, satisfy the demand that subway wireless network broadband covers.
The manufacture method of broad band radiation type leak coaxial cable for subway:
1, selects copper strips to be welded into copper pipe through vertical bag and produce the spirality wrinkle inner wire that meets designing requirement by the embossing integration system; Described copper strips thickness is 0.3mm～0.4mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the vinyon of melting with the high pressure of 350bar, under 180 ℃～200 ℃ high temperature, fully mix, and carry out physical blowing, then extrude through crowded plastics machine and be coated on formation physical blowing polyethylene layer on the inner wire surface; Described vinyon and the purity stated is that 99.99% nitrogen or carbon dioxide weight proportion are 100:6～20;
3, outer conductor adopts the Copper Foil band, carries out automatic punching able to programme at the Copper Foil band first, and the slotted eye of going out is arc-shaped slot; The flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, will rush the vertical surface of insulating layer that is coated on of outer conductor Copper Foil band of grooved hole, vertical bag squeezes and protects integratedly, and conductive copper foil surface is squeezed and covered polyolefin or flame-retardant polyolefin sheathed through squeezing plastics machine outside; Described Copper Foil tape thickness is 0.1mm～0.2mm.
The characteristics of broad band radiation type leak coaxial cable for subway and preparation method thereof:
1, physically foamed pe insulation layer of the present invention, because the method for injecting nonpolar nitrogen or carbon dioxide is adopted in the generation of foaming pore, the foaming pore remains evenly, mutually sealing, the electric capacity uniformity;
2, without burn into waterproof, protection against the tide, good airproof performance;
3, slotted eye is even on the outer conductor, physical dimension control is accurate, and the voltage standing wave ratio of cable is low, power capacity is high and bending property is good;
4, foam degrees is high, and the cable footpath is little, has reduced cost and constructability;
5, working band is wide, can reach between 100MHz-3000MHz, and it is even that signal output covers field intensity, disturbs littlely, and capacity is large.
Description of drawings
The invention will be further described below with reference to accompanying drawing.
Fig. 1 is the broad band radiation type leak coaxial cable for subway structural representation.
Fig. 2 is slotted eye schematic diagram on the outer conductor of broad band radiation type leak coaxial cable for subway.
Among the figure, 1, inner wire 2, insulating barrier 3, slotted eye 4, outer conductor 5, sheath
Embodiment
With reference to accompanying drawing 1,2, broad band radiation type leak coaxial cable for subway comprises inner wire 1, insulating barrier 2, outer conductor 4 and sheath 5, at inner wire 1 outer cladding insulating barrier 2, be coated with outer conductor 4 at insulating barrier 2, outside outer conductor 3, be set with sheath 5, it is characterized in that adopting purity at the surface coated insulating barrier 2 of inner wire 1 is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seal mutually, have preferably electric property.Outer conductor 4 Copper Foil bands in insulating barrier 2 outer claddings have arc-shaped slot 3, have arc-shaped slot 3 at outer conductor 4, and the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
Described inner wire 1 adopts copper strips to be welded into copper pipe by embossing formation spirality wrinkle inner wire through vertical bag; Described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to consist of; Described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
The manufacture method embodiment 1 of broad band radiation type leak coaxial cable for subway:
1, the copper strips of selecting thickness 0.3mm is welded into copper pipe through vertical bag and produces the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm by the embossing integration system;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 180 ℃ of high temperature, fully mix, and carry out physical blowing, then extrude and be coated on the upper insulating barrier 2 that forms in inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow first the Copper Foil band carry out automatically-controlled continuous able to programme at Special punch and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, above-mentioned punching is had arc-shaped slot outer conductor 4 Copper Foil bands be coated on insulating barrier 1 surface with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through squeezing crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of plastics machine; Described Copper Foil tape thickness is 0.1mm.
The manufacture method embodiment 2 of broad band radiation type leak coaxial cable for subway:
1, the copper strips of selecting thickness 0.35mm is welded into copper pipe embossing integration system through vertical bag and produces the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 190 ℃ of high temperature, fully mix, and carry out physical blowing, then extrude and be coated on the upper insulating barrier 2 that forms in inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow first the Copper Foil band carry out automatically-controlled continuous able to programme at Special punch and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, above-mentioned punching is had arc-shaped slot outer conductor 4 Copper Foil bands be coated on insulating barrier 1 surface with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through squeezing crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of plastics machine; Described Copper Foil tape thickness is 0.15mm.
The manufacture method embodiment 3 of broad band radiation type leak coaxial cable for subway:
1, the copper strips of selecting thickness 0.4mm is welded into copper pipe embossing integration system through vertical bag and produces the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 200 ℃ of high temperature, fully mix, and carry out physical blowing, then extrude and be coated on the upper insulating barrier 2 that forms in inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow first the Copper Foil band carry out automatically-controlled continuous able to programme at Special punch and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, above-mentioned punching is had arc-shaped slot outer conductor 4 Copper Foil bands be coated on insulating barrier 1 surface with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through squeezing crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of plastics machine; Described Copper Foil tape thickness is 0.2mm.
Broad band radiation type leak coaxial cable for subway outer conductor of the present invention adopts the camber perforate, and the function that reach is exactly mainly to realize following three functions in any point of the route of its process: a) transmission electromagnetic wave in the cable; B) outside emitting electromagnetic wave; C) receive the specific electromagnetic wave in outside; D) can realize that the wireless system broadband of private network 2G, 3G covers at the subway tunnel environment, energy is concentrated relatively on the electromagenetic wave radiation direction, field intensity is even, and have disturb little, advantage capacious.
The broad band radiation type leak coaxial cable for subway product is through detecting Specifeca tion speeification:
Consumption is 65dB; The transmission speed ratio is 89%.Adopt the continuous or automatic control of interruption punching technology able to programme, and vertical bag-wrapped-sheath integral production technology, use the standing-wave ratio of frequency range less than 1.2, working band is wide, can reach between 100MHz-3000MHz, satisfy the demand of subway 2G, the covering of 3G WiMAX fully.
Claims (3)
1. broad band radiation type leak coaxial cable for subway, formed by inner wire, insulating barrier, outer conductor and sheath, at inner wire outer cladding insulating barrier, be coated with outer conductor at insulating barrier, at the outer conductor overcoat sheath is housed, it is characterized in that adopting purity at the surface coated insulating barrier of inner wire is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seals mutually; Outer conductor Copper Foil band in the insulating barrier outer cladding has arc-shaped slot, and the flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
Described inner wire adopts copper strips to consist of spirality wrinkle inner wire through being welded into copper pipe by embossing;
Described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to consist of.
2. broad band radiation type leak coaxial cable for subway according to claim 1 is characterized in that described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
3. the manufacture method of broad band radiation type leak coaxial cable for subway claimed in claim 1 is characterized in that:
(1) selects copper strips to be welded into copper pipe through vertical bag and produce spirality wrinkle inner wire by the embossing integration system; Described copper strips thickness is 0.3mm～0.4mm;
(2) adopting purity is that 99.99% nitrogen or carbon dioxide inject the vinyon of melting with the high pressure of 350bar, under 180 ℃～200 ℃ high temperature, fully mix, and carry out physical blowing, then extrude through crowded plastics machine and be coated on formation physical blowing polyethylene layer on the inner wire surface; Described vinyon and purity are that 99.99% nitrogen or carbon dioxide weight proportion are 100: 6～20;
(3) outer conductor adopts the Copper Foil band, carries out automatic punching able to programme at the Copper Foil band first, and the slotted eye of going out is arc-shaped slot; The flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
(4) with the vertical surface of insulating layer that is coated on of the above-mentioned outer conductor Copper Foil band that rushes grooved hole, vertical bag squeezes and protects integratedly, and conductive copper foil surface is squeezed and covered polyolefin or flame-retardant polyolefin sheathed through squeezing plastics machine outside; Described Copper Foil tape thickness is 0.1mm～0.2mm.
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| CN 200810235151 CN101404350B (en) | 2008-11-14 | 2008-11-14 | Broad band radiation type leak coaxial cable for subway and its production method |
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| CN 200810235151 CN101404350B (en) | 2008-11-14 | 2008-11-14 | Broad band radiation type leak coaxial cable for subway and its production method |
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| CN101404350B true CN101404350B (en) | 2013-04-10 |
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| CN105741970B (en) * | 2016-04-28 | 2017-05-10 | 杭州富通电线电缆有限公司 | Radio-frequency cable |
| CN107785105A (en) * | 2016-08-31 | 2018-03-09 | 中天射频电缆有限公司 | Leakage coaxial cable and preparation method thereof |
| CN106448925A (en) * | 2016-10-26 | 2017-02-22 | 国家电网公司 | SPP water-tolerant winding wire manufacturing technique |
| CN106601326A (en) * | 2016-12-30 | 2017-04-26 | 通鼎互联信息股份有限公司 | Bending-resistant broadband radiant leakage coaxial cable |
| CN108933312A (en) * | 2017-05-27 | 2018-12-04 | 中天射频电缆有限公司 | Coaxial cable and preparation method thereof |
| CN109066093B (en) * | 2018-08-07 | 2019-06-21 | 江苏亨鑫科技有限公司 | A kind of production technology of leakage cable outer conductor fluting |
| CN110336109B (en) * | 2019-08-10 | 2024-06-04 | 江苏俊知技术有限公司 | Composite copper layer polyvinyl chloride leaky waveguide feeder and manufacturing method thereof |
| CN114696105B (en) * | 2020-12-31 | 2024-02-02 | 江苏俊知技术有限公司 | Leaky circular waveguide transmission line with novel structure and manufacturing method thereof |
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| CN2385411Y (en) * | 1999-02-12 | 2000-06-28 | 天津经济技术开发区东源实业公司 | Leakage coaxial cable |
| CN201303039Y (en) * | 2008-11-14 | 2009-09-02 | 中天日立射频电缆有限公司 | Wideband radiation leakage coaxial cable for subway |
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| GB1387001A (en) * | 1971-05-06 | 1975-03-12 | Sumitomo Electric Industries | Leaky coaxial cables |
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| CN201303039Y (en) * | 2008-11-14 | 2009-09-02 | 中天日立射频电缆有限公司 | Wideband radiation leakage coaxial cable for subway |
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Address after: 226010 Nantong Province Economic and Technological Development Zone, the New South Road, No. 1, No. Patentee after: Zhongtian RF cable Co., Ltd. Address before: 226010 Nantong Province Economic and Technological Development Zone, the New South Road, No. 1, No. Patentee before: Zhongtian Rili Rf Cable Co., Ltd. |