CN210156168U - Rail traffic signal cable with stable line group structure - Google Patents

Abstract

The utility model discloses a track traffic signal cable with stable group structure, the cable core is composed of a star-shaped four-line group, the star-shaped four-line group is formed by twisting four low inductance insulation core wires, the low inductance insulation core wires are clamped in the wire fixing fork heads of core wire fixing forks, and a plurality of core wire fixing forks are connected in series with each other through a fork head connecting rope; the low-inductance insulation core wire comprises a core wire fiber bundle positioned in the center of the core wire, and an inner conductor, a foam insulation layer, an outer conductor, a core wire insulation wrapping tape and a core wire shielding layer are sequentially wrapped on the core wire fiber bundle from inside to outside; the cable core is coated with a cable core insulating wrapping tape, and the cable core insulating wrapping tape is sequentially coated with an inner protection layer, a cable core shielding layer and an outer sheath outwards. Four wire fixing fork heads of the core wire fixing fork are connected with each other through the fork head connecting rib plates. The core wire fiber bundle is formed by twisting chemical fiber filaments; the inner conductor and the outer conductor are woven by a plurality of strands of soft round copper wires. The cable is stable in structure and strong in anti-interference capability.

Description

Rail traffic signal cable with stable line group structure

Technical Field

The utility model relates to a track traffic cable technical field especially relates to a signal control cable for track traffic signal control system.

Background

The rail transit signal cable is a key component for connecting rail transit signals, related equipment and control devices in a communication system, and is used for transmitting the rail transit signals, audio signals, analog signals, digital signals, system control information and electric energy. Therefore, the rail transit signal cable not only has safe and reliable signal transmission performance, but also has electrical performance such as information transmission and energy transmission.

The basic structure of the prior track traffic signal cable comprises an outer protective layer and a cable core positioned in the outer protective layer, wherein the cable core consists of low-inductance insulating core wires divided into a plurality of groups. The cable adopting the multi-low inductance insulation core wire as the track signal transmission and control loop is safe and convenient, saves investment and can effectively reduce the interference problem of an external circuit. However, with the rapid development of rail transit in China, the control line of a control system becomes longer and longer, the application environment becomes more and more complex, and under the condition that the control power supply of the cable is alternating current, the distributed capacitance and inductance between core wires in the cable and between the core wires and the shielding layer reach a certain value, the control loop malfunctions, transmits error information, influences the normal operation of a high-speed railway, and seriously may cause a safety problem.

The main parameters determining the transmission quality of communication signals in the rail transit signal cable comprise indexes such as impedance, crosstalk and attenuation, and the electrical performance indexes are directly influenced by the capacitance and inductance characteristics of the cable and the core line structure of the cable, such as parameters such as line group pitch and relative structure position. These parameter relationships affect both the transmission performance and the interference rejection capability of the cable, as well as the structural stability of the cable and the mechanical and physical properties of the cable.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a track traffic signal cable with stabilize group structure is provided, not only has lower inductance and capacitance value, and group stable in structure can effectively strengthen the interference killing feature of cable moreover, guarantees that cable structure and electrical property are stable.

In order to solve the technical problem, the utility model discloses a track traffic signal cable with stable group structure, including the cable core to and constitute a plurality of star quad to of cable core, star quad is twisted by four low inductance insulation heart yearns, and this low inductance insulation heart yearn clamps in the fixed line jaw of heart yearn fixed fork, and a plurality of heart yearn fixed forks connect the rope through the jaw and establish ties each other; the low-inductance insulation core wire comprises a core wire fiber bundle positioned in the center of the core wire, and an inner conductor, a foam insulation layer, an outer conductor, a core wire insulation wrapping tape and a core wire shielding layer are sequentially wrapped on the core wire fiber bundle from inside to outside; the cable core is coated with a cable core insulating wrapping tape, and the cable core insulating wrapping tape is sequentially coated with an inner protection layer, a cable core shielding layer and an outer sheath outwards.

In the structure, the star-shaped four-wire group forming the cable core is formed by twisting four low-inductance insulation core wires, the low-inductance insulation core wires adopt an inner conductor structure and an outer conductor structure, a foam insulation layer is arranged between the inner conductor and the outer conductor, the two oppositely arranged layers of conductors can transmit electric signals, and a corresponding inductance surface is formed between the two layers of conductors, so that the inductance value of the cable core wires is effectively reduced; the foam insulating layer is adopted between the inner conductor and the outer conductor, the dielectric constant is reduced through a foam layer structure, the unbalance value of the line pair conductor capacitance and the capacitance to the ground is reduced, and the performance requirements of low capacitance, low inductance, low attenuation and long-distance signal transmission are met. And because the low-inductance insulated core wires forming the star-shaped four-wire group are clamped in the wire fixing fork head of the core wire fixing fork, the core wire fixing fork enables the low-inductance insulated core wires of the wire group to be mutually arranged in a limited space position, so that the more reasonable and larger spacing distance of the insulated core wires is kept, the mutual positions are firm and stable, the stability of the positions and the increase of the spacing distance improve the anti-crosstalk attenuation level of the four-wire group, the core wire fixing fork also effectively reduces the mutual extrusion among the wire groups, the contact stress among the low-inductance insulated core wires is greatly reduced, the extrusion deformation of the contact part of the insulated core wires is reduced, and the cable core structure and the cable impedance are better ensured to be uniform and stable. A plurality of core wire fixing forks are arranged at intervals along the length direction of the cable and are connected with the ropes in series through fork heads, so that the fixing effect on the insulating core wires is guaranteed, the structure and materials of the fixing forks are simplified, and the flexibility of the cable is effectively maintained. And because the core wire fiber bundle is arranged at the core wire center position of the low-inductance insulation core wire, the structure increases the diameter of the inner conductor on one hand, and enhances the tensile strength and the core wire flexibility of the core wire on the other hand. The utility model discloses a cladding has cable core insulation band, interior sheath, cable core shielding layer and oversheath in proper order on the cable core, and this kind of comprehensive sheath structure makes the cable have fine insulating properties, shielding property and protection security for the cable has comprehensive properties such as good electricity and machinery, and inductance, electric capacity that had both effectively reduced the cable guarantees the safe and reliable transmission of signal again.

The utility model discloses a preferred embodiment, the fork is fixed to the heart yearn is including four solidus jaw, and these four solidus jaws pass through jaw connection rib board interconnect, have worn the jaw at cross jaw connection rib board central point and have connected the rope, the face of gripping of solidus jaw is identical with the insulating heart yearn outer peripheral face of low inductance, and the outside of this solidus jaw sets up the jaw opening, and this jaw open-ended opening angle α = 120-150.

In a preferred embodiment of the present invention, the core fiber bundle is formed by twisting chemical fiber filaments; the inner conductor and the outer conductor are formed by weaving a plurality of strands of soft round copper wires. The weaving density of the soft round copper wires of the inner conductor and the outer conductor is 92% -96%. The advantages of high tensile strength and high flexibility are achieved, the inductance is reduced, and the conductivity is improved.

In the preferred embodiment of the utility model, the core wire shielding layer is formed by wrapping an aluminum-plastic composite shielding belt; the foaming degree of the foam insulation layer is 70% -80%. The insulating layer adopts high foaming degree, so that the coaxial capacitance of the core wire is effectively reduced, the blocking effect of the capacitance and the inductance on an effective variable electric field in a circuit is weakened, and the transmission quality is improved.

The utility model discloses a preferred embodiment, the package is indulged by the compound shielding area of plastic-aluminum to form in the group shielding layer, the cable core shielding layer is netted braided shielding layer. The overlapping amount of the wrapping tapes of the cable core insulating wrapping tape is 10% -15% of the tape width, and the outer sheath is a polyurethane mixture extrusion coating layer. Has excellent shielding performance and stable mechanical and physical performance.

Drawings

The following describes the track traffic signal cable with stable wire set structure in detail with reference to the accompanying drawings and the detailed description.

Fig. 1 is a schematic cross-sectional view of an embodiment of a rail transit signal cable with a stable wire group structure according to the present invention;

FIG. 2 is a schematic cross-sectional view of the quad star in the embodiment of FIG. 1;

FIG. 3 is a cross-sectional structural view of the core fixing fork of the embodiment of FIG. 1;

fig. 4 is a left side view schematically showing the core wire fixing fork of fig. 3.

In the figure, 1-star four-wire group, 2-low inductance insulation core wire, 21-core wire fiber bundle, 22-inner conductor, 23-foam insulation layer, 24-outer conductor, 25-core wire insulation tape, 26-core wire shielding layer, 3-core wire fixing fork, 31-wire fixing fork head, 32-fork head connecting rib plate, 33-fork head connecting rope, 34-holding surface, 4-low dielectric constant insulation tape, 5-wire group shielding layer, 6-gathering fork binding yarn, 7-cable core insulation tape, 8-inner protection layer, 9-cable core shielding layer and 10-outer protection layer.

Detailed Description

The track traffic signal cable with the stable wire group structure as shown in fig. 1 has a cable core composed of four star-shaped four-wire groups, and each star-shaped four-wire group 1 is formed by twisting four low-inductance insulation core wires 2. Every low inductance insulation heart yearn 2 clamps in the fixed line jaw 31 of heart yearn stationary fork 3, and the fixed fork 3 of a plurality of heart yearn sets up along cable length direction interval each other, and the fixed fork 3 of each heart yearn connects the rope 33 through the jaw and establishes ties each other.

A cable core of the cable is coated with a cable core insulating tape 7, and the coating overlapping amount of the cable core insulating tape 7 is controlled to be 10-15%; the cable core insulation belting 7 is a foamed PP belt coated outside the cable core, the thickness of the foamed PP belt is 0.2mm, the foamed PP belt has good insulation performance, and the foamed PP belt also has good elasticity and flexibility, so that the impact damage effect of external force on the cable core can be effectively reduced. The cable core insulating belting 7 is coated with the inner protection layer 8, the inner protection layer 8 is formed by continuously extruding black linear low-density polyethylene sheath materials, and the linear low-density polyethylene sheath materials have good mechanical and physical properties and good flexibility. The inner sheath 8 is provided with a cable core shielding layer 9, the cable core shielding layer 9 is formed by weaving soft round copper wires or tinned soft copper wires, and the weaving density is controlled to be 70% -80%. An outer sheath 10 formed by extruding and wrapping a polyester mixture is extruded and wrapped on the cable core shielding layer 9, and the thickness of the outer sheath 10 is 1.2mm, so that the cable core shielding layer has the characteristics of wear resistance and corrosion resistance.

As shown in the radial quad 1 shown in fig. 2, the radial quad 1 includes low-inductance insulated core wires 2 and core fixing prongs 3 for clamping the low-inductance insulated core wires 2. Sequentially coating a low-dielectric-constant insulating tape 4, a wire group shielding layer 5 and polyester binder yarns 6 on a star-shaped four-wire group 1 consisting of four low-inductance insulating core wires 2; the wire group shielding layer 5 is longitudinally wrapped by an aluminum-plastic composite shielding belt.

The central position of the low-inductance insulation core wire 2 is a core wire fiber bundle 21, the core wire fiber bundle 21 is composed of chemical fibers such as polyester filament yarn, an inner conductor 22 is wrapped on the periphery of the core wire fiber bundle 21, the inner conductor 22 is formed by weaving soft round copper wires, a foam insulation layer 23 is extruded on the inner conductor 22, the foam insulation layer 23 is made through physical foaming or chemical foaming, the foaming degree of the foam insulation layer is controlled to be 75%, an outer conductor 24 is wrapped on the foam insulation layer 23, and the outer conductor 24 is also formed by weaving soft round copper wires. The braid density of the inner and outer conductors 22, 24 is 95%. The outer conductor 24 is wrapped with a core wire insulating wrapping tape 25, the core wire insulating wrapping tape 25 is wrapped with a core wire shielding layer 26, and the core wire shielding layer 26 is formed by wrapping an aluminum-plastic composite shielding foil tape.

As shown in fig. 3, the core wire fixing fork 3 includes four wire fixing forks 1, the four wire fixing forks 31 are connected with each other by a cross-shaped fork connecting rib plate 32, the fork connecting rib plate 32 and the four wire fixing forks 31 are connected into a whole, a fork connecting rope 33 is threaded at the center of the cross-shaped fork connecting rib plate 32, a holding surface 34 of the wire fixing fork 31 is located on a cylindrical surface, the holding surface 34 is matched with the outer circumferential surface of the low inductance insulation core wire 2, a fork opening is provided at the outer side of the wire fixing fork 31, and an opening angle α =130 °.

The foregoing has outlined some of the preferred embodiments of the present invention, but the present invention is not limited thereto, and many modifications and variations may be made without departing from the basic principles of the present invention, for example, the four star-shaped wire sets in the cable core are not limited to four sets, and may be selected as several sets according to actual conditions, the weaving density of the inner conductor and the outer conductor is not limited to 95%, but is preferably between 92% and 96%, the opening angle α of the opening of the head of the fixing fork 31 on the fixing fork 31 is preferably 120 ° to 150 °, the degree of foaming of the insulating layer of the foam insulating layer is preferably 70% to 80%, and so on, and these modifications and variations fall within the scope of the present invention.

Claims (7)

1. The utility model provides a track traffic signal cable with stabilize group structure, includes the cable core to and constitute a plurality of star quad (1) of cable core, its characterized in that: the star-shaped four-wire group (1) is formed by twisting four low-inductance insulating core wires (2), the low-inductance insulating core wires (2) are clamped in wire fixing fork heads (31) of core wire fixing forks (3), and a plurality of core wire fixing forks (3) are connected in series through fork head connecting ropes (33); the low-inductance insulation core wire (2) comprises a core wire fiber bundle (21) positioned in the center of the core wire, and an inner conductor (22), a foam insulation layer (23), an outer conductor (24), a core wire insulation wrapping tape (25) and a core wire shielding layer (26) are sequentially wrapped on the core wire fiber bundle (21) from inside to outside; the cable core is coated with a cable core insulating wrapping tape (7), and the cable core insulating wrapping tape (7) is sequentially coated with an inner protection layer (8), a cable core shielding layer (9) and an outer sheath (10) outwards.

2. The rail transit signal cable with the stable wire group structure according to claim 1, wherein: the core wire fixing fork (3) comprises four wire fixing fork heads (31), the four wire fixing fork heads (31) are connected with each other through fork head connecting rib plates (32), and a fork head connecting rope (33) penetrates through the center of each cross-shaped fork head connecting rib plate (32).

3. The rail transit signal cable with the stable wire group structure according to claim 2, wherein a holding surface (34) of the wire fixing fork head (31) is matched with the outer peripheral surface of the low-inductance insulating core wire (2), a fork head opening is arranged on the outer side of the wire fixing fork head (31), and the opening angle α of the fork head opening ranges from =120 degrees to 150 degrees.

4. The rail transit signal cable with the stable wire group structure according to claim 1, wherein: the core wire fiber bundle (21) is formed by stranding chemical fiber filaments; the inner conductor (22) and the outer conductor (24) are formed by weaving a plurality of strands of soft round copper wires.

5. The rail transit signal cable with the stable wire group structure according to claim 4, wherein: the weaving density of the soft round copper wires of the inner conductor (22) and the outer conductor (24) is 92% -96%.

6. The rail transit signal cable with the stable wire group structure according to claim 1, wherein: the core wire shielding layer (26) is formed by winding an aluminum-plastic composite shielding tape; the foaming degree of the foam insulation layer (23) is 70% -80%.

7. The rail transit signal cable with the stable wire group structure according to claim 1, wherein: the overlapping amount of the cable core insulating wrapping tape (7) is 10% -15% of the tape width, and the outer sheath (10) is a polyurethane mixture extrusion coating layer.

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