Full-shielding grounding type armored field bus cable

Abstract

The utility model discloses a full-shielding grounding type armored field bus cable, which comprises two single-pair shielding twisted wire cores and two external fan-shaped polyethylene resin filling core frames, wherein the two single-pair shielding twisted wire cores and the two external fan-shaped polyethylene resin filling core frames are arranged in a cross shape to form a cable core; each shielding twisted-pair wire core comprises a wire core body which is formed by back-twisting and twisting two insulating wire cores and arranging the two insulating wire cores and two inner-layer fan-shaped polyethylene resin filling core frames in a cross shape, and the wire core body is sequentially wrapped by an aluminum-plastic composite belt longitudinal wrapping waterproof sub-shielding layer, a tinned copper wire inner grounding wire and a semi-conductive nylon water-blocking wrapping layer. The cable core is sequentially coated with an aluminum-plastic composite tape longitudinally-wrapped waterproof total shielding layer, a tinned copper wire outer grounding wire, a copper wire woven total shielding layer, an irradiation crosslinking linear low-density polyethylene inner sheath layer, a galvanized steel wire armor layer and an irradiation crosslinking linear low-density polyethylene outer sheath layer. The cable is balanced and stable in structure, the twisted wire cores are not easy to loosen, the anti-interference capability is enhanced, the cable is suitable for working in a humid environment for a long time, and the durability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a fully shielded grounded armored field bus cable. Background Art

[0002] The process fieldbus can be used in the process automation control and measuring instrument connection lines in the factory basic control field environment to realize the construction of an open and decentralized digital fieldbus communication system. It can be installed in cable trays and pipelines in indoor, outdoor, humid or dry environments. The fieldbus needs to face a very complex electromagnetic environment. The fieldbus adopts a cable core structure of 1, 2, 5 or 10 twisted cores. The twisted cores generally adopt a double-core twisting method without back-twisting and the external reverse wrapping aluminum-plastic composite tape wrapping shielding layer. The structural strength is weak, and the double cores of the twisted cores are easy to loosen, which is not conducive to reducing the interference between the wire pairs themselves, greatly weakening the anti-interference ability, and the shielding effect is unstable, affecting normal work. Moreover, the overlapped parts of the aluminum tape wrapping are prone to gaps, and water vapor penetrates from the gaps, thereby damaging the insulation layer, reducing the life of the cable, and the durability is poor. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a fully shielded grounded armored field bus cable with a balanced and stable structure, high mechanical strength, certain resistance to mechanical damage, and the twisted wire core is not easy to loosen during transmission, and the anti-interference ability is enhanced, and the moisture-proof and water-blocking properties are strengthened. The cable is suitable for working in a humid environment for a long time, and the stable electrical properties of the cable are ensured, and the durability is better.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] A fully shielded grounded armored fieldbus cable comprises two single-pair shielded twisted cores and two external fan-shaped polyethylene resin filled core frames arranged in a cross shape to form a cable core, the single-pair shielded twisted core comprises two insulated cores which are twisted back and combined with two inner fan-shaped polyethylene resin filled core frames arranged in a cross shape to form a core body, the insulated core comprises an oxygen-free copper conductor and a foamed skin polyethylene insulation layer, the outside of the core body is sequentially coated with an aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer, a tinned copper wire inner grounding wire and a semi-conductive nylon water-blocking sheathing layer, talcum powder is filled between the core body and the aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer, the outside of the cable core is sequentially coated with an aluminum-plastic composite tape longitudinally wrapped waterproof overall shielding layer, a tinned copper wire outer grounding wire, a copper wire braided overall shielding layer, an irradiated cross-linked linear low-density polyethylene inner sheath layer, a galvanized steel wire armor layer and an irradiated cross-linked linear low-density polyethylene outer sheath layer, and talcum powder is filled between the cable core and the aluminum-plastic composite tape longitudinally wrapped waterproof overall shielding layer.

[0006] Preferably, the longitudinal wrapping direction of the waterproof shielding layer of the aluminum-plastic composite tape is the same as the lay direction of the wire core, and the lay direction of the wire core is the same as the lay direction of the cable core.

[0007] Preferably, the oxygen-free copper conductor is composed of seven oxygen-free copper wires twisted concentrically.

[0008] Preferably, the lay lengths of the two single pairs of shielded twisted wire cores are different.

[0009] Preferably, the aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer and the aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer are both aluminum-plastic composite tape longitudinally overlapped wrapped structures with an overlap rate of 25% to 40%.

[0010] Preferably, the aluminum-plastic composite tape is formed by a composite of an MDPE water-blocking inner layer, an aluminum foil layer and an LDPE water-blocking outer layer.

[0011] Preferably, the copper wire braided total shielding layer is formed by weaving a plurality of polyester fiber copper foil wires and silver-plated copper wires in counter-rotating spirals.

[0012] Preferably, the tinned copper wire inner grounding wire and the tinned copper wire outer grounding wire are both seven tinned copper wires with a wire diameter of 0.3 mm.

[0013] Preferably, the thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer is 1.5 mm.

[0014] Preferably, the thickness of the galvanized steel wire armor layer is 0.9 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. By adding two fan-shaped polyethylene resin filled core frames inside the wire core and the cable core of a single pair of shielded twisted wire cores, it is helpful to ensure the roundness of the wire core cross section and the cable core cross section, and the structure is more balanced and stable, with high mechanical strength, better bending resistance and improved durability.

[0017] 2. The aluminum-plastic composite tape longitudinally wraps the waterproof moisture and the total shielding layer to replace the original aluminum-plastic composite tape wrapped shielding layer, which can effectively prevent water vapor from penetrating from the gap, enhance the moisture-proof and water-blocking properties, strengthen the barrier of water vapor diffusion to the insulation layer, delay the water tree aging phenomenon of the insulation layer, improve durability and extend the life of the cable.

[0018] 3. The two insulated cores of a single pair of shielded twisted cores are optimized to be back-twisted, the insulated cores themselves are twisted and the twist direction is opposite to the twist direction of the core body, the twist direction of the core body is the same as the twist direction of the cable core, and the longitudinal wrapping direction of the waterproof shielding layer of the aluminum-plastic composite tape is the same as the twist direction of the core body, which is beneficial to suppress the loosening of the single pair of shielded twisted cores, and thus beneficial to reduce the influence of interference between the two insulated cores of the single pair of shielded twisted cores, enhance the ability to resist external electromagnetic interference, ensure stable shielding characteristics, and improve durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional structure diagram of a specific implementation method of the present application.

[0020] In the figure: 1-single pair of shielded twisted core, 2-external fan-shaped polyethylene resin filled core frame, 3-insulated core, 4-inner fan-shaped polyethylene resin filled core frame, 5-oxygen-free copper conductor, 6-foamed polyethylene insulation layer, 7-aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer, 8-tinned copper wire inner grounding wire, 9-semi-conductive nylon water-blocking sheathing layer, 10-aluminum-plastic composite tape longitudinally wrapped waterproof overall shielding layer, 11-tinned copper wire outer grounding wire, 12-copper wire braided overall shielding layer, 13-irradiated cross-linked linear low-density polyethylene inner sheath layer, 14-galvanized steel wire armor layer, 15-irradiated cross-linked linear low-density polyethylene outer sheath layer. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1 As shown, the fully shielded grounded armored field bus cable of the embodiment of the utility model comprises two single-pair shielded twisted wire cores 1 and two external fan-shaped polyethylene resin filled core frames 2 arranged in a cross shape to form a cable core. Furthermore, the two single-pair shielded twisted wire cores 1 have different twist pitches. The single-pair shielded twisted wire core 1 comprises two insulated wire cores 3 that are twisted back and arranged in a cross shape with two inner fan-shaped polyethylene resin filled core frames 4 to form a wire core body. The insulated wire core 3 comprises an oxygen-free copper conductor 5 and a foamed skin polyethylene insulation layer 6. Specifically, the oxygen-free copper conductor 5 is composed of seven oxygen-free copper wires twisted concentrically. The outside of the wire core body is sequentially coated with an aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer 7, a tinned copper wire internal grounding wire 8 and a semi-conductive nylon water-blocking sheathing layer 9. Talcum powder is filled between the wire core body and the aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer 7. The tinned copper wire internal grounding wire 8 is seven 0.3 mm tinned copper wires. Furthermore, the longitudinal wrapping direction of the aluminum-plastic composite tape waterproof shielding layer 7 is the same as the lay direction of the wire core, and the lay direction of the wire core is the same as the lay direction of the cable core.

[0023] The cable core is coated with an aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer 10, a tinned copper wire external grounding wire 11, a copper wire braided total shielding layer 12, an irradiated cross-linked linear low-density polyethylene inner sheath layer 13, a galvanized steel wire armor layer 14 and an irradiated cross-linked linear low-density polyethylene outer sheath layer 15 in sequence, and talcum powder is filled between the cable core and the aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer 10. In one embodiment, the aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer 7 and the aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer 10 are both aluminum-plastic composite tape longitudinally overlapped wrapped structures with an overlap rate of 25% to 40%. Further, the aluminum-plastic composite tape is formed by a composite of an MDPE water-blocking inner layer, an aluminum foil layer and an LDPE water-blocking outer layer. In one embodiment, the copper wire braided total shielding layer 12 is formed by a plurality of polyester fiber copper foil wires and silver-plated copper wires being mutually reversely spirally wound and braided. The tinned copper wire external grounding wire 11 is seven tinned copper wires. The thickness of the galvanized steel wire armor layer 14 is 0.9 mm. The thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer 15 is 1.5 mm.

[0024] The present invention is described by way of embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the guidance of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the claims of this application belong to the scope of protection of the present invention.

Claims

1. Fully shielded grounded armored fieldbus cable, Its characteristics are: The invention comprises two single-pair shielded twisted wire cores (1) and two external fan-shaped polyethylene resin filled core frames (2) arranged in a cross shape to form a cable core, wherein the single-pair shielded twisted wire core (1) comprises two insulated wire cores (3) which are twisted back and combined with two inner fan-shaped polyethylene resin filled core frames (4) arranged in a cross shape to form a wire core body, wherein the insulated wire core (3) comprises an oxygen-free copper conductor (5) and a foamed polyethylene insulation layer (6), and the outside of the wire core body is sequentially coated with an aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer (7), a tinned copper wire internal grounding wire (8) and a semi-conductive nylon The cable core is provided with a longitudinal waterproof sheath (9), talcum powder is filled between the cable core and the longitudinal waterproof shielding layer (7) of the aluminum-plastic composite tape, the exterior of the cable core is sequentially coated with a longitudinal waterproof overall shielding layer (10) of the aluminum-plastic composite tape, a tinned copper wire external grounding wire (11), a copper wire braided overall shielding layer (12), an irradiated cross-linked linear low-density polyethylene inner sheath layer (13), a galvanized steel wire armor layer (14) and an irradiated cross-linked linear low-density polyethylene outer sheath layer (15), and talcum powder is filled between the cable core and the longitudinal waterproof overall shielding layer (10) of the aluminum-plastic composite tape.

2. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The longitudinal wrapping direction of the aluminum-plastic composite tape waterproof shielding layer (7) is the same as the lay direction of the wire core, and the lay direction of the wire core is the same as the lay direction of the cable core.

3. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The oxygen-free copper conductor (5) is composed of seven oxygen-free copper wires twisted concentrically.

4. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The two single-pair shielded twisted wire cores (1) have different lay lengths.

5. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The aluminum-plastic composite tape longitudinally wrapped waterproof shielding layer (7) and the aluminum-plastic composite tape longitudinally wrapped waterproof total shielding layer (10) are both aluminum-plastic composite tape longitudinally overlapped wrapped structures with an overlap rate of 25% to 40%.

6. The fully shielded grounded armored fieldbus cable according to claim 5, Its characteristics are: The aluminum-plastic composite tape is formed by compounding an MDPE water-blocking inner layer, an aluminum foil layer and an LDPE water-blocking outer layer.

7. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The copper wire braided total shielding layer (12) is formed by a plurality of polyester fiber copper foil wires and silver-plated copper wires being braided and wound in counter-rotating spirals.

8. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The tinned copper wire inner grounding wire (8) and the tinned copper wire outer grounding wire (11) both consist of seven tinned copper wires.

9. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer (15) is 1.5 mm.

10. The fully shielded grounded armored fieldbus cable according to claim 1, Its characteristics are: The thickness of the galvanized steel wire armor layer (14) is 0.9 mm.

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