阅读说明：本技术 新型单元屏蔽阻水防潮报警铁路数字信号电缆 (Novel unit shielding water-blocking moisture-proof alarm railway digital signal cable ) 是由 张惠琴 魏大章 王丽 郭辛 李俊霞 方丽 方宇 于 2021-08-12 设计创作，主要内容包括：本发明提出了新型单元屏蔽阻水防潮报警铁路数字信号电缆,含有缆芯,缆芯由若干个四线组+若干个对线组+防潮报警线芯绞合,四线组有单元屏蔽四线组+非屏蔽四线组,四线组、对线组、防潮报警线芯处于油膏填充物中,油膏填充物之外依次是绝缘包带、第一阻水包带、防潮层、第二阻水包带、铝护套、内垫层、铠装层、外护套,构成星形四线组结构,其外依次为纵包压纹绝缘包带+轧纹纵包单面铝塑复合带+绕包本色绝缘包带+绕包有色绝缘包带,绕包有色绝缘包带中设有泄流导线；防潮报警线芯为实心导体+聚乙烯绝缘并在绝缘层打有孔。有益效果：具有稳定的传输特性,优异的阻水防潮和受潮报警功能,良好电磁屏蔽性能、抗冲击抗压扁性能。(The invention provides a novel unit-shielded water-blocking and moisture-proof alarm railway digital signal cable, which comprises a cable core, wherein the cable core is formed by twisting a plurality of four line groups + a plurality of paired groups + a moisture-proof alarm cable core, each four line group comprises a unit-shielded four line group + a non-shielded four line group, the four line groups, the paired groups and the moisture-proof alarm cable core are positioned in an ointment filler, an insulating wrapping tape, a first water-blocking wrapping tape, a moisture-proof layer, a second water-blocking wrapping tape, an aluminum sheath, an inner cushion layer, an armor layer and an outer sheath are sequentially arranged outside the ointment filler to form a star-shaped four line group structure, a longitudinally-wrapped embossed insulating wrapping tape, a longitudinally-wrapped single-side aluminum-plastic composite tape, a wrapped natural-color insulating wrapping tape and a wrapped colored insulating wrapping tape are sequentially arranged outside the star-wrapped colored insulating wrapping tape, and a drainage wire is arranged in the wrapped colored insulating wrapping tape; the damp-proof alarm wire core is a solid conductor and is insulated by polyethylene, and the insulating layer is perforated with holes. Has the advantages that: the cable has stable transmission characteristics, excellent water-blocking, moisture-proof and damp-bearing alarm functions, good electromagnetic shielding performance, impact resistance and flattening resistance.)

1. Novel unit shielding dampproofing warning railway digital signal cable that blocks water, characterized by: the cable comprises a cable core, wherein the cable core is formed by twisting a plurality of four-wire sets (2), a plurality of paired wire sets (8) and a moisture-proof alarm wire core (9), the four-wire sets (2) comprise a unit shielding four-wire set and a non-shielding four-wire set, the four-wire set (2), the paired wire sets (8) and the moisture-proof alarm wire core (9) are arranged in an ointment filler (10), an insulating wrapping tape (11), a first water-blocking wrapping tape (12), a moisture-proof layer (13), a second water-blocking tape (14), an aluminum sheath (15), an inner cushion layer (16), an armor layer (17) and an outer sheath (18) are sequentially arranged outside the ointment filler (10), the unit shielding four-wire set comprises a skin-foam-skin physical foaming insulating single wire (1), the skin-foam-skin physical foaming insulating single wire (1) has four different colors, the four wires form a star-shaped four-wire set structure (2) by twisting, and the outer surface of the star-shaped four-wire set (2) is sequentially longitudinally wrapped by embossing insulating single-side lines (3) and longitudinally wrapped by aluminum-plastic-side The composite tape (4), the wrapped natural-color insulating tape (6) and the wrapped colored insulating tape (7) are arranged, wherein the plastic surface of the embossed longitudinally-wrapped single-side aluminum-plastic composite tape (4) faces inwards, at least one thin soft round copper wire serving as a drainage wire (5) is longitudinally arranged outside the embossed longitudinally-wrapped single-side aluminum-plastic composite tape (4), and the drainage wire (5) is mutually contacted with the embossed longitudinally-wrapped single-side aluminum-plastic composite tape (4); the moisture-proof alarm wire core (9) is a solid conductor (21) and is insulated by polyethylene, and the insulating layer (19) is perforated with holes (20).

2. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: the damp-proof layer (13) is formed by bonding a double-sided aluminum-plastic composite belt which is longitudinally wrapped and a polyethylene sleeve which is extruded on the plastic surface of the double-sided aluminum-plastic composite belt.

3. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: a layer of hot melt adhesive is coated outside the aluminum sheath (15), and the inner cushion layer (16) and the aluminum sheath (15) are tightly bonded by the hot melt adhesive.

4. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: the inner cushion layer (16) is extruded by a polyurethane elastomer.

5. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: the armor layer (17) adopts a double-layer high-permeability galvanized steel strip gap wrapping structure.

6. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: the diameter of the hole (20) of the moisture-proof alarm wire core (9) is 1.0mm, and the distance between adjacent holes is less than or equal to 15 mm.

7. The novel unit-shielded water-blocking moisture-proof alarm railway digital signal cable as claimed in claim 1, which is characterized in that: 2 dampproof alarm wire cores (9) are symmetrically arranged in the cable core in parallel.

Technical Field

The invention belongs to the technical field of cables, and relates to a railway digital signal cable.

Background

The original unit shielding material of the internal shield railway digital signal cable is a bare copper strip, and after the shielding layer is formed by longitudinally wrapping the embossed bare copper strip, the overall hardness can be increased, so that the hard shielding layer of the cable in the bending process can easily damage a wire core insulating layer, and thus, some quality hidden troubles can be caused. In addition, in some developing countries such as Laos, because the cables are bare copper strip shields and contain more copper, the cables are often stolen. In addition, Laos et al are in southeast Asia countries, where local climate is humid and geological disasters occur frequently, so the cable needs to have the functions of water resistance, moisture resistance and external impact resistance. Such cables with a combination of properties are currently lacking.

Disclosure of Invention

In order to solve the problems, the invention provides a novel unit shielding water-blocking moisture-proof alarm railway digital signal cable.

The technical scheme of the invention is as follows: a novel unit shielding water-blocking damp-proof alarm railway digital signal cable comprises a cable core, wherein the cable core is formed by twisting a plurality of four line groups, a plurality of paired line groups and a damp-proof alarm cable core, each four line group comprises a unit shielding four line group and a non-shielding four line group, the four line groups, the paired line groups and the damp-proof alarm cable core are positioned in an ointment filler, an insulating wrapping tape, a first water-blocking wrapping tape, a damp-proof layer, a second water-blocking wrapping tape, an aluminum sheath, an inner cushion layer, an armor layer and an outer sheath are sequentially arranged outside the ointment filler, each unit shielding four line group comprises a skin-foam-skin physical foaming insulating single line, the skin-foam-skin physical foaming insulating single line has four lines with different colors, the four lines are twisted to form a star-shaped four line group structure, the outer surface of the star-shaped four line group is sequentially wrapped from inside to outside by a longitudinal wrapping insulating composite grain longitudinal wrapping tape, a longitudinal wrapping single-surface aluminum-plastic wrapping tape, a self-color insulating wrapping tape and a colored insulating wrapping tape, wherein the plastic surface of the embossed longitudinally-coated single-sided aluminum-plastic composite belt faces inwards, at least 1 thin soft round copper wire is longitudinally arranged outside the embossed longitudinally-coated single-sided aluminum-plastic composite belt to be used as a drainage wire, and the drainage wire is mutually contacted with the embossed longitudinally-coated single-sided aluminum-plastic composite belt; the moisture-proof alarm wire core is a solid conductor and is insulated by polyethylene, and the insulating layer is perforated with holes.

The damp-proof layer is formed by bonding a double-sided aluminum-plastic composite belt formed by longitudinal wrapping and a polyethylene sleeve wrapped on the plastic surface of the double-sided aluminum-plastic composite belt in an extruding manner.

And a layer of hot melt adhesive is coated outside the aluminum sheath, and the hot melt adhesive enables the inner cushion layer and the aluminum sheath to be tightly bonded.

The inner cushion layer is extruded by a polyurethane elastomer.

The armor layer adopts a double-layer high-permeability galvanized steel strip gap wrapping structure.

The diameter of the hole of the alarm wire core is 1.0mm, and the distance between adjacent holes is less than or equal to 15 mm.

2 dampproofing warning sinle silks are put into to the parallel symmetry in the cable core.

The invention has the beneficial effects that: the device is suitable for connection between related equipment and a control device in a railway signal system, and can realize transmission of system control information and electric energy of 1MHz analog signals, 2Mbit/s digital signals, rated voltage alternating current of 750V or direct current of 1100V and the following. The product has stable transmission characteristics, excellent water-blocking, moisture-proof and damp-bearing alarm composite functions, good electromagnetic shielding performance and higher mechanical impact and flattening resistance, can be laid under the condition of strong electric interference in an electric traction section of an electrified railway, and is particularly suitable for application occasions in a humid environment.

Drawings

FIG. 1: a schematic cross-sectional view of the cable of the present invention;

FIG. 2: a cross-sectional view of a unit shield quad group;

FIG. 3: the structure schematic diagram of the alarm wire core;

FIG. 4: the punching structure schematic diagram of the alarm wire core.

In the figure: 1-skin-foam-skin physical foaming insulation single line, 2-star-shaped four-line group, 3-longitudinal-wrapping embossed insulation wrapping tape, 4-embossing longitudinal-wrapping single-side aluminum-plastic composite tape, 5-drainage wire, 6-wrapping natural color insulation wrapping tape, 7-wrapping colored insulation wrapping tape, 8-paired group, 9-moisture-proof alarm wire core, 10-ointment filler, 11-insulation wrapping tape, 12-first water-blocking wrapping tape, 13-moisture-proof layer, 14-second water-blocking wrapping tape, 15-aluminum sheath, 16-inner cushion layer, 17-armor layer and 18-outer sheath.

Detailed Description

As shown, the main technical points are as follows:

1) skin-foam-skin physical foaming insulated single wire: physical foaming skin-foam-skin three-layer co-extrusion wire drawing and extrusion molding tandem line production is adopted.

2) Four line groups: the star-shaped four-wire set structure is formed by twisting four insulated single wires with different colors, and is produced by adopting a high-speed precise data cable star twister.

3) Unit shield quad: the structure sequentially comprises a star-shaped four-line group 2+ a longitudinal-wrapping embossed insulating tape 3+ an embossed longitudinal-wrapping single-side aluminum-plastic composite tape 4+ a wrapping natural-color insulating tape 6+ a wrapping colored insulating tape 7 from inside to outside. The star-shaped four-wire group 2 is formed by longitudinally wrapping embossed insulating wrapping tapes, plays roles of buffering and lining, and protects the insulating wire cores from being damaged by the shielding layer; the plastic surface of the single-sided aluminum-plastic composite belt faces inwards, the shielding layer is prevented from damaging the insulated wire core when the cable is bent or is subjected to external force, the single-sided aluminum-plastic composite belt is embossed with proper thickness, good bending performance of the cable is guaranteed, the aluminum-plastic belt is not easy to break when the cable is bent, a thin soft round copper wire is longitudinally arranged outside the embossed longitudinally-wrapped single-sided aluminum-plastic composite belt 4 to serve as a drain wire 5, the drain wire 5 is in contact with the embossed longitudinally-wrapped single-sided aluminum-plastic composite belt 4, the full-length electrical conduction of the embossed longitudinally-wrapped single-sided aluminum-plastic composite belt is guaranteed, meanwhile, a good flow guiding effect can be achieved, and the reliable grounding of a shielding body is guaranteed. Due to the existence of the shielding layer, under the normal working state of the cable, the crosstalk performance between the shielding groups is excellent, and the effect that the frequency shift signals with the same frequency are transmitted in different shielding groups in one cable at the same time and the signals among line groups are not interfered can be realized; the single-side aluminum-plastic composite belt is wrapped with 2 layers of insulating wrapping belts in an overlapped mode, the inner layer adopts the natural-color insulating wrapping belt to improve the insulating performance, so that the unit shielding four-wire set structure is more stable, and the outer layer adopts the colored insulating wrapping belt to distinguish the colors (groups) of the shielding unit four-wire set.

4) Cable core: the cable is formed by twisting a plurality of unit shielding four-wire groups, non-shielding four-wire groups, paired groups and a moisture-proof alarm wire core, and in order to ensure stable structure and good bending performance of the cable core and reduce deformation, when the wire groups are twisted together to form a cable, a proper cabling pitch is selected, and meanwhile, a water-blocking ointment filler is continuously filled in a gap of the cable core, so that the longitudinal water seepage resistance and moisture resistance of the cable are improved. The number of the four-line set and the pair-twisted set of the cable core can be increased or decreased according to the number of the signal line transmission channels.

5) Inner water blocking layer: the insulating wrapping tape 11 and the first water-blocking wrapping tape 12 with proper thicknesses are wrapped outside the cable core in an overlapping mode, so that the stability and the insulating performance of the cable core are guaranteed, and the longitudinal water-blocking performance between the cable core and the heat insulating layer is improved.

6) Moisture-proof layer: is formed by bonding a longitudinally-wrapped double-sided aluminum-plastic composite belt and a polyethylene sleeve wrapped on the longitudinally-wrapped double-sided aluminum-plastic composite belt in an extruded mode. In the process of extruding and wrapping the polyethylene sleeve, the plastic surface of the double-sided aluminum-plastic composite belt is tightly bonded with the polyethylene after being heated, so that the radial moisture-proof and water-blocking functions of the cable are improved.

7) Outer water-resistant layer: a second water-blocking wrapping tape 14 is wrapped outside the moisture-proof layer in an overlapping mode, and the water-blocking performance between the moisture-proof layer 13 and the aluminum sheath is improved.

8) A shielding layer: and the aluminum sheath 15 is adopted for shielding, so that the mechanical impact resistance and flattening resistance of the cable are improved. A layer of hot melt adhesive is coated outside the aluminum sheath, so that the inner cushion layer and the aluminum sheath are tightly bonded together, and the water-blocking and moisture-proof performance between the inner cushion layer and the aluminum sheath is improved.

9) Inner cushion layer: the polyurethane elastomer is adopted for extrusion coating, so that the effects of buffering and cushion are achieved, and the mechanical strength, impact resistance and flattening resistance of the cable are improved.

10) Armor: the double-layer high-permeability galvanized steel strip gap wrapping structure is adopted, external strong electromagnetic interference can be effectively resisted, the electromagnetic shielding performance of the cable is improved, and the mechanical strength impact resistance and the crush resistance of the cable are improved.

11) Outer sheath: the cable is extruded by special sheath materials, and the thickness of the sheath accords with the regulation of GB2952 cable outer protective layer.

12) Moisture-proof alarm composite function: 2 dampproofing warning heart yearns 9 are put into to parallel symmetry in the cable core, and dampproofing warning heart yearn 9's main function is when the cable that lays has the tide gas to invade, and dampproofing warning heart yearn 9 sends alarm signal through monitoring facilities, can discover and deal with as early as possible. The alarm line adopts solid polyethylene insulation core and punches, and the diameter in hole is 1.0mm, and the distance of punching is less than or equal to 15mm, and insulating surface forms even aperture, and when the cable received the moisture to invade, the insulation resistance of alarm line sharply descends to send alarm signal through the monitor, guarantee railway driving safety.

13) The shielding structure of the cable adopts a single-sided aluminum-plastic composite belt, a double-sided aluminum-plastic composite belt, an aluminum sheath and a high-permeability steel belt armored structure, and the ideal shielding coefficient index is higher than the specified value of TB/T3100-2017 railway digital signal cables.

14) By adopting the polyurethane elastomer inner cushion layer and the high-permeability steel belt, the impact resistance and the flattening resistance of the cable are higher than 30% of the specified indexes of TB/T3100-2017.

15) All performance indexes of the cable comprise primary parameters and secondary parameters which all accord with the specified values of TB/T3100-2017 railway digital signal cables.

Compared with the conventional railway digital signal cable, the novel shielding railway digital signal cable has the following advantages:

1) the embossing longitudinal-wrapping single-side aluminum-plastic composite tape is used as a shielding material, so that the copper consumption of the cable is reduced, the problem of theft is solved, and the cost of the cable is reduced. Fundamentally solves original cable structure because the quality hidden danger of naked copper tape shielding layer damage sinle silk insulating layer easily in bending process.

2) And the waterproof cable paste is continuously filled in the cable core gap, and a waterproof layer and a moisture-proof layer are added outside the cable core, so that the longitudinal waterproof and seepage-proof capability and the radial moisture-proof capability of the cable are improved.

3) The cable structure increases the dampproofing warning sinle silk of insulating sinle silk punching, realizes that the cable receives the real-time supervision function that moisture invaded.

4) The impact resistance and the flattening resistance of the cable are higher than 30 percent of the specified indexes of TB/T3100-2017 by adopting the aluminum sheath, the polyurethane elastomer inner cushion layer and the high-permeability steel belt

5) The performance indexes of the cable comprise primary parameters (direct current resistance, insulation compressive strength, working capacitance, capacitive coupling coefficient, unbalanced capacitance to ground and the like) and secondary parameters (characteristic impedance, line pair attenuation, phase angle and the like) which all accord with standard specified values of TB/T3100-2017 railway digital signal cables.

The invention adopts a novel unit shielding structure to replace the original bare copper strip shielding, water-blocking ointment is filled in a cable core to improve the longitudinal water seepage resistance and moisture resistance of the cable, a water-blocking layer and a moisture-proof layer are added in the original cable structure to improve the water-blocking and moisture-proof functions of the cable, a moisture-proof alarm unit is added in the original cable structure to realize the real-time monitoring function of whether the cable is invaded by moisture, each performance index of the cable comprises a primary parameter and a secondary parameter which are in accordance with the standard specification of TB/T3100-2017 railway digital signal cable, and partial technical indexes are higher than standard specified values, the invention reduces the copper consumption, solves the theft problem, simultaneously reduces the cable cost, improves the mechanical shock resistance and the crush resistance of products, is particularly suitable for local climate moisture because the invention has the combined functions of water-blocking and moisture-proof alarm, the special environment that geological disasters frequently occur is used, and can be popularized and used in domestic and international markets.

This dampproofing alarming function characteristics of product use internal shield digital signal cable, adopt the insulation core that punches, need not to connect alarm device, and when the tide invaded, the alarm core directly sent out signal alarm through monitoring facilities, and it is more simple and convenient to operate, and the warning effect is better.

The following are the performance effect test data of the present invention:

1. insulation resistance of cable when moisture invades

Normally, the insulation resistance test of the cable is generally more than 10 ten thousand M omega.km, when moisture invades, the insulation resistance rapidly drops to zero, and an alarm signal is sent out through monitoring equipment.

2. Cable ideal shielding coefficient test record

TABLE 1 Shielding coefficient test data

Conclusion 1: from the test data in the table 1, the induced voltage on the cable sheath is 35V/km-200V/km, the ideal shielding coefficient of the cable is less than 0.1, and the index is far better than the specified value (not more than 0.2) of TB/T3100.

3. Cable crush and impact test record

TABLE 2 Cable crush and impact test data

Conclusion 2: from the test data in table 2 above, it can be seen that the collapse resistance and impact resistance of the cable are higher than the specified indexes of TB/T3100 by more than 30% by using the polyurethane inner pad layer, and the collapse resistance and impact resistance indexes of the cable are better than those of the PE inner pad layer cable. The cable model/specification is compiled according to TB/T3100-.

4. Cable electrical performance test record

TABLE 3 Cable Electrical Performance test data

Conclusion 3: as can be seen from the test data in Table 3 above, the electrical performance of the cable meets the requirement of TB/T3100. The specified value of (1).

5. And analyzing the copper consumption and cost of the cable, and compiling the following cable types/specifications according to TB/T3100-.

TABLE 4 copper savings and cost analysis data for cables

Conclusion 4: as can be seen from the above table 4 of the cost analysis data, taking SPTYPPL 23/48A as an example, the invention can save more than 140 kilograms of copper, save 9800 units of capital and reduce the cost of the cable by adopting the technology of the invention for 1 kilometer of the cable.

6. Water permeation resistance test of cable

The cable has no water seepage after a water seepage test. The test method conforms to the regulation of GB/T7424.2.