Small-diameter vibration reduction type bending-resistant multi-core total shielding cable

Abstract

The utility model discloses a small-diameter vibration-damping type bending-resistant multi-core total shielding cable, which comprises six power wire cores and three coaxial video wire cores which surround the outside of a TPU (thermoplastic polyurethane) elastomer vibration-damping core tube and are twisted together to form a cable core, and an alignment type wholly aromatic copolyamide stretching fiber core material is sleeved inside the TPU elastomer vibration-damping core tube. A TPU elastomer vibration reduction core tube is wrapped outside the cable core, a PTFE semi-directional belt inner wrapping antifriction layer is wrapped outside the TPU elastomer vibration reduction core tube, a PTFE semi-directional belt outer wrapping antifriction layer, a silver-plated copper wire braided total shielding layer and a PFA outer sheath layer are sequentially wrapped outside the cable core, each power wire core conductor is formed by twisting a plurality of tinned copper wires with the wire diameter ranging from 0.04 mm to 0.1 mm, and each coaxial video wire core comprises a tinned copper monofilament conductor. The diameter of the tinned copper monofilament conductor is not smaller than one half of the diameter of the tinned copper wire and does not exceed the diameter of the tinned copper wire. The cable has a certain vibration reduction performance, is better in bending resistance, inhibits the occurrence of wire and core breakage, and is better in durability.

Description

Technical Field

[0001] This application relates to the technical field of cables, and particularly to a thin-diameter vibration-damping and bending-resistant multi-core total shielded cable. Background Art

[0002] Control cables are used as connecting wires between various electrical appliances, instruments, meters, and automatic devices, playing the role of transmitting various electrical energy signals such as startup, operation, control, signal display, and measurement. They are widely used in control, measurement, signal transmission, alarm, and interlock systems in industrial and mining enterprises, substations, transportation, science and technology, and other departments. The electromagnetic noise environment at industrial application sites is often very complex, and the radiation or conduction (EMI) of electromagnetic noise may seriously interfere with the normal operation of equipment. During this process, an important carrier for the propagation of electromagnetic noise is various cables used in production line equipment. Some of them are noise sources, and some are objects affected by interference. An extremely important way to combat electromagnetic noise interference on electrical circuits is to use shielded cables. In a shielded multi-core cable, the power cores and coaxial video cores are jointly stranded in the cable core. Due to the trend of miniaturization and micro-miniaturization of equipment, multi-core cables are also developing towards thinner diameters. The required outer diameter of the cable for thinner diameter preparation is between 2 mm and 5 mm, and even within 2 mm. Under high-frequency bending working conditions, the vibration-damping and bending-resistant performance is poor, and the power cores and coaxial video cores are prone to core breakage and wire breakage, and the signal transmission characteristics are unstable, thereby affecting the electrical characteristics of the cable. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide a thin-diameter vibration-damping and bending-resistant multi-core total shielded cable, which has certain vibration-damping performance, reduces the load borne by each core, has better bending-resistant performance, inhibits the occurrence of core breakage and wire breakage, has stable signal transmission characteristics, and better durability.

[0004] The above technical problems are solved by the following technical solutions in this application.

[0005] Thin-diameter vibration-damping and bending-resistant multi-core total shielded cable, comprising six power cores and three coaxial video cores which are jointly stranded around the outside of a TPU elastomer vibration-damping core tube. A counterpoint type wholly aromatic copolyamide tensile fiber core material is sleeved inside the TPU elastomer vibration-damping core tube. A PTFE semi-oriented tape inner wrapping anti-friction layer is coated outside the TPU elastomer vibration-damping core tube. The outside of the cable core is successively coated with a PTFE semi-oriented tape outer wrapping anti-friction layer, a silver-plated copper wire braided total shield layer and a PFA outer sheath layer. The power core comprises a power core conductor and a PFA insulating layer. The power core conductor is composed of a plurality of tinned copper wires with a wire diameter of 0.04 mm to 0.1 mm. The coaxial video core comprises a tinned copper single wire conductor, a foamed PFA insulating layer, a shielded wire winding partial shield layer and a nylon resin coating layer. The diameter of the tinned copper single wire conductor is 0.02 mm to 0.05 mm. The diameter of the tinned copper single wire conductor is not less than one-half of the wire diameter of the tinned copper wire and does not exceed the wire diameter of the tinned copper wire. The shielded wire winding partial shield layer is a structure in which a plurality of partial shield wires are spirally wound side by side. The partial shield wire is composed of a silver-plated copper single wire conductor and a polyurethane coating layer. The diameter of the silver-plated copper single wire conductor is not less than one-third of the diameter of the tinned copper single wire conductor and does not exceed the diameter of the tinned copper single wire conductor.

[0006] Preferably, the diameter of the silver-plated copper single wire conductor is 35% to 80% of the diameter of the tinned copper single wire conductor.

[0007] Preferably, the thickness of the polyurethane coating layer is 0.01 mm to 0.02 mm.

[0008] Preferably, the outer diameter of the power core is 95% to 105% of the outer diameter of the coaxial video core.

[0009] Preferably, both the PTFE semi-oriented tape inner wrapping anti-friction layer and the PTFE semi-oriented tape outer wrapping anti-friction layer are multi-layer PTFE semi-oriented tape overlapping wrapping structures with a thickness of 0.01 to 0.1 mm.

[0010] Preferably, the silver-plated copper wire braided total shield layer is a structure in which a plurality of polyester fiber copper foil wires and silver-plated copper wires are spirally wound and braided in opposite directions.

[0011] Preferably, the wire diameter ratio between the polyester fiber copper foil wire and the silver-plated copper wire is between 0.9 and 1.

[0012] Preferably, the shielding density of the silver-plated copper wire braided total shield layer is 90% to 95%.

[0013] Advantages of this application:

[0014] 1. The TPU elastomer damping core tube is elastic, providing a certain degree of damping performance, reducing the load borne by each core. An all-aromatic copolyamide drawn fiber core material with a para-position type is sleeved inside. The all-aromatic copolyamide drawn fiber core material with a para-position type has a large tensile elastic modulus, enhancing flexibility, which helps to better withstand the lateral pressure when the cable is bent and improves the bending resistance. The PTFE semi-oriented tape is wound around the inner and outer friction-reducing layers, which has excellent friction-reducing effects, causing sliding between the inside and outside of the cable core, forming an effect similar to that of a rolling bearing, with a small sliding friction resistance. This helps to reduce the load applied to the power core and the coaxial video core, helps to inhibit the occurrence of core breakage and wire breakage in each core, and has a stable signal transmission characteristic, improving durability.

[0015] 2. Optimize the conductor structure and wire diameter ratio of the power core and the coaxial video core. The conductor structure of the power core uses tinned copper wires with a wire diameter of 0.04 mm to 0.1 mm stranded together. The conductor structure of the coaxial video core is a single-wire conductor with a diameter of 0.02 mm to 0.05 mm. The diameter of the tinned copper single-wire conductor is not less than one-half and not more than the wire diameter of the tinned copper wire. This is beneficial to improving the bending resistance of the combined cable of the power core and the coaxial video core and inhibiting core breakage and wire breakage. Optimize the inner conductor and outer conductor structure and wire diameter ratio of the coaxial video core. The diameter of the silver-plated copper single-wire conductor of the used split shielding wire is not less than one-third and not more than the diameter of the tinned copper single-wire conductor, which is beneficial to improving the bending resistance performance of the coaxial video core and has better durability.

[0016] 3. The split shielding layer is formed by multiple shielding wires wound in a side-by-side spiral manner. The shielding wire is composed of a silver-plated copper single-wire conductor and a polyurethane coating layer, so that the silver-plated copper single wires do not directly contact each other, eliminating the contact current generated by the shielding layer, which helps to inhibit the attenuation of high-frequency signal long-distance transmission, ensures the stability of the shielding effect, and has better electrical characteristics. Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of this application.

[0018] Description of the Reference Numerals:

[0019] 1 - Power core, 2 - Coaxial video core, 3 - TPU elastomer damping core tube, 4 - All-aromatic copolyamide drawn fiber core material with a para-position type, 5 - Inner PTFE semi-oriented tape friction-reducing layer, 6 - Outer PTFE semi-oriented tape friction-reducing layer, 7 - Silver-plated copper wire braided total shielding layer, 8 - PFA outer sheath layer, 9 - Power core conductor, 10 - PFA insulation layer, 11 - Tinned copper wire, 12 - Tinned copper single-wire conductor, 13 - Foamed PFA insulation layer, 14 - Split shielding layer wound by shielding wires, 15 - Nylon resin coating layer, 16 - Silver-plated copper single-wire conductor, 17 - Polyurethane coating layer. Detailed Embodiment

[0020] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] See also Figure 1 The thin-diameter vibration-damping, anti-bending multi-core overall shielded cable of the embodiment of the present application includes six power cores 1 and three coaxial video cores 2 twisted together around the outside of a TPU elastomer vibration-damping core tube 3 to form a cable core. Furthermore, the outer diameter of the power core 1 is 95% to 105% of the outer diameter of the coaxial video core 2. The inside of the TPU elastomer vibration-damping core tube 3 is sleeved with a para-type fully aromatic copolyamide stretched fiber core material 4, and the outside of the TPU elastomer vibration-damping core tube 3 is coated with a PTFE semi-directional tape inner wrapping anti-friction layer 5, and the outside of the cable core is sequentially coated with a PTFE semi-directional tape outer wrapping anti-friction layer 6, a silver-plated copper wire braided overall shielding layer 7 and a PFA outer sheath layer 8. In one embodiment, the PTFE semi-directional tape inner wrapping anti-friction layer 5 and the PTFE semi-directional tape outer wrapping anti-friction layer 6 are both multi-layer PTFE semi-directional tape overlapping wrapping structures with a thickness of 0.01 to 0.1 mm. In one embodiment, the silver-plated copper wire braided total shielding layer 7 is a braided structure of a plurality of polyester fiber copper foil wires and silver-plated copper wires wound in counter-rotating spirals, and further, the wire diameter ratio of the polyester fiber copper foil wires to the silver-plated copper wires is between 0.9 and 1. The shielding density of the silver-plated copper wire braided total shielding layer 7 is 90% to 95%.

[0022] The power core 1 includes a power core conductor 9 and a PFA insulation layer 10. The power core conductor is composed of a plurality of tinned copper wires 11 with a diameter of 0.04 mm to 0.1 mm. The coaxial video core 2 includes a tinned copper monofilament conductor 12, a foamed PFA insulation layer 13, a shielded wire winding sub-shielding layer 14 and a nylon resin coating layer 15. The diameter of the tinned copper monofilament conductor 12 is 0.02 mm to 0.05 mm. The diameter of the tinned copper monofilament conductor 12 is not less than half of the diameter of the tinned copper wire 11 and does not exceed the diameter of the tinned copper wire 11. Furthermore, the diameter of the silver-plated copper monofilament conductor 16 is 35% to 80% of the diameter of the tinned copper monofilament conductor 12. The shielded conductor winding sub-shielding layer 14 is a structure of several sub-shielding conductors spirally wound side by side, and the sub-shielding conductor is composed of a silver-plated copper monofilament conductor 16 and a polyurethane coating layer 17. The diameter of the silver-plated copper monofilament conductor 16 is not less than one-third of the diameter of the tin-plated copper monofilament conductor 12 and does not exceed the diameter of the tin-plated copper monofilament conductor 12. The thickness of the polyurethane coating layer 17 is 0.01 mm to 0.02 mm.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Thin-diameter vibration-damping anti-bending multi-core overall shielded cable, characterized by: The invention comprises six power line cores (1) and three coaxial video line cores (2) which are twisted together around the outside of a TPU elastomer vibration-damping core tube (3) to form a cable core. The inside of the TPU elastomer vibration-damping core tube (3) is provided with a para-type fully aromatic copolyamide stretched fiber core material (4). The outside of the TPU elastomer vibration-damping core tube (3) is coated with a PTFE semi-directional tape inner wrapped anti-friction layer (5). The outside of the cable core is sequentially coated with a PTFE semi-directional tape outer wrapped anti-friction layer (6), a silver-plated copper wire braided total shielding layer (7) and a PFA outer sheath layer (8). The power line core (1) comprises a power line core conductor (9) and a PFA insulation layer (10). The power line core conductor is composed of a plurality of tinned copper wires (11) with a wire diameter of 0.04 mm to 0.1 mm twisted together. The coaxial video line core (2 ) comprises a tinned copper monofilament conductor (12), a foamed PFA insulation layer (13), a shielded wire winding sub-shielding layer (14) and a nylon resin coating layer (15), wherein the diameter of the tinned copper monofilament conductor (12) is 0.02 mm to 0.05 mm, the diameter of the tinned copper monofilament conductor (12) is not less than half of the diameter of the tinned copper wire (11) and does not exceed the diameter of the tinned copper wire (11), the shielded wire winding sub-shielding layer (14) is a structure of several sub-shielded wires wound in parallel spirally, the sub-shielded wire is composed of a silver-plated copper monofilament conductor (16) and a polyurethane coating layer (17), the diameter of the silver-plated copper monofilament conductor (16) is not less than one-third of the diameter of the tinned copper monofilament conductor (12) and does not exceed the diameter of the tinned copper monofilament conductor (12).

2. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized in that: The diameter of the silver-plated copper monofilament conductor (16) is 35% to 80% of the diameter of the tin-plated copper monofilament conductor (12).

3. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized in that: The polyurethane coating layer (17) has a thickness of 0.01 mm to 0.02 mm.

4. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized in that: The outer diameter of the power line core (1) is 95% to 105% of the outer diameter of the coaxial video line core (2).

5. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized in that: The PTFE semi-directional tape inner wrapped anti-friction layer (5) and the PTFE semi-directional tape outer wrapped anti-friction layer (6) are both multi-layer PTFE semi-directional tape overlapping wrapped structures with a thickness of 0.01 to 0.1 mm.

6. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized by: The silver-plated copper wire braided total shielding layer (7) is a braided structure in which a plurality of polyester fiber copper foil wires and silver-plated copper wires are mutually spirally wound in opposite directions.

7. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 6 is characterized by: The wire diameter ratio of the polyester fiber copper foil wire and the silver-plated copper wire is between 0.9 and 1.

8. The thin-diameter vibration-damping anti-bending multi-core overall shielded cable according to claim 1 is characterized by: The shielding density of the silver-plated copper wire braided total shielding layer (7) is 90% to 95%.

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