U-shaped bending resistant and attenuation resistant coaxial cable

Abstract

The utility model discloses a U-shaped bending-resistant anti-attenuation coaxial cable, which comprises a polyester staple fiber buffer core material, and a plurality of tinned copper wire mesh conductor layers formed on the outer surface of the polyester staple fiber buffer core material by weaving and pressing a plurality of tinned copper monofilaments with the wire diameter not more than 0.18 mm. A PFA extruded inner insulating layer, an ETFE wrapping outer insulating layer, a copper wire winding inner shielding layer, a ferrite film wrapping layer, an irradiation crosslinking high-density polyethylene inner sheath layer, a copper wire winding outer shielding layer and an irradiation crosslinking high-density polyethylene outer sheath layer are sequentially wrapped outside the tinned copper net conductor layer. The copper-wire-wound inner shielding layer and the copper-wire-wound outer shielding layer are both formed by spirally winding a plurality of fan-shaped silver-plated copper wires side by side. The cable has better U-shaped bending resistance, the conductors are not easy to break, the mechanical strength of the shielding layer is high, the bending torsion resistance is better, the reduction of signal attenuation is facilitated, the shielding performance is stable, and the durability is better.

Description

Technical Field

[0001] This application relates to the technical field of cables, and particularly to a U-shaped bend-resistant and attenuation-resistant coaxial cable. Background Art

[0002] Coaxial cable is one of the main varieties of wire and cable. The industrial application site has a complex environment, and the radiation or conduction (EMI) of electromagnetic noise may seriously interfere with the normal operation of equipment. In this process, an important carrier for the propagation of electromagnetic noise is various cables used in production line equipment. On an automated industrial manufacturing production line, coaxial cables are required for electrical connection and control of small robots, electronic machines, etc. The copper wire shielding structure of coaxial cables is usually a round copper wire wound shielding, and the gaps formed between the round copper wires are relatively large. Under the condition of repeated torsion and bending, it is easy to break the wire, the signal transmission attenuation is large, and the noise shielding effect is not very ideal. Moreover, the conductor is usually a stranded copper wire structure. When the coaxial cable is in operation, it needs to withstand U-shaped bending and torsion. Local stress concentration is likely to occur in the conductor under the bending stress state, resulting in broken wires of the copper wire, and the durability is poor. Utility Model Content

[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide a U-shaped bend-resistant and attenuation-resistant coaxial cable, which has better U-shaped bend resistance, the conductor is not easy to break, the shielding layer has high mechanical strength, better bending and torsion resistance, helps to reduce the signal attenuation, has stable shielding performance, and better durability.

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

[0005] The U-shaped bend-resistant and attenuation-resistant coaxial cable includes a polyester staple fiber buffer core material. On the outer surface of the polyester staple fiber buffer core material, a tinned copper wire mesh conductor layer is formed by braiding and compacting a number of tinned copper single wires with a wire diameter not exceeding 0.18 mm. The outside of the tinned copper wire mesh conductor layer is sequentially coated with a PFA extruded inner insulation layer, an ETFE wrapped outer insulation layer, a copper wire wound inner shielding layer, a ferrite film wrapped layer, an irradiated cross-linked high-density polyethylene inner sheath layer, a copper wire wound outer shielding layer, and an irradiated cross-linked high-density polyethylene outer sheath layer. Both the copper wire wound inner shielding layer and the copper wire wound outer shielding layer are formed by spirally winding a number of fan-shaped silver-plated copper wires side by side.

[0006] Preferably, the wire diameter of the tinned copper single wire is 0.04 mm to 0.16 mm.

[0007] Preferably, the thickness of the PFA extruded inner insulation layer is 2 to 4 times the thickness of the ETFE wrapped outer insulation layer.

[0008] Preferably, the ferrite film wrapped layer is a multi-layer overlapping wrapped structure of ferrite film.

[0009] Preferably, the winding direction of the ferrite film wrapping layer is opposite to that of the copper wire wound inner shielding layer.

[0010] Preferably, the thickness of the irradiated cross-linked high-density polyethylene outer sheath layer is 0.45 mm to 3 mm.

[0011] Preferably, the thickness of the ferrite film wrapping layer is 0.1 mm to 0.3 mm.

[0012] Preferably, the shielding coverage rate of the copper wire wound inner shielding layer and the copper wire wound outer shielding layer is 90% to 98%.

[0013] Preferably, the cross-sectional area of the inner layer sector silver-plated copper wire of the copper wire wound inner shielding layer is smaller than that of the outer layer sector silver-plated copper wire of the copper wire wound outer shielding layer.

[0014] Preferably, the thickness of the copper wire wound inner shielding layer is smaller than that of the copper wire wound outer shielding layer.

[0015] Advantages of the present application:

[0016] 1. By adding a polyester staple fiber buffer core material to absorb energy, during the repeated U-shaped bending process of the coaxial cable, the bending force on the tinned copper mesh conductor layer is dispersed and slowed down, local stress concentration is reduced, the occurrence of wire breakage of the tinned copper wire is effectively inhibited, the flexibility of the tinned copper mesh conductor layer is improved, there will be no loosening, and the durability and applicability are better.

[0017] 2. By improving the original round copper wire wound shielding structure into a sector silver-plated copper wire wound shielding structure, the mechanical strength of the shielding layer is improved, the flexibility is better, the torque force during bending is reduced, the torsion resistance and bending resistance are improved, the ferrite film wrapping layer is wrapped around the outside of the copper wire wound inner shielding layer to fix the inner shielding layer and prevent loosening, which helps to reduce the signal attenuation amount and ensure the stability of the shielding performance. By adding a copper wire wound outer shielding layer between the irradiated cross-linked high-density polyethylene inner and outer sheath layers, the sheath layer is protected and a double-layer shielding structure is formed with the copper wire wound inner shielding layer, improving the stability of the shielding performance, increasing the safety and reliability, and the durability and applicability are better. Description of the Drawings

[0018] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present application.

[0019] Description of the reference numerals:

[0020] 1 - Polyester staple fiber buffer core material, 2 - Tinned copper mesh conductor layer, 3 - PFA extruded inner insulation layer, 4 - ETFE wrapped outer insulation layer, 5 - Copper wire wound inner shielding layer, 6 - Ferrite thin film wrapped layer, 7 - Radiation cross-linked high-density polyethylene inner sheath layer, 8 - Copper wire wound outer shielding layer, 9 - Radiation cross-linked high-density polyethylene outer sheath layer. Specific embodiments

[0021] The terms used in the embodiments section of this application are only for explaining the specific embodiments of this application and are not intended to limit this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] See Figure 1 , the U-shaped bend resistant and attenuation resistant coaxial cable of the embodiment of this application includes a polyester staple fiber buffer core material 1. On the outer surface of the polyester staple fiber buffer core material 1, a tinned copper mesh conductor layer 2 is formed by braiding and compacting a number of tinned copper single wires with a wire diameter not exceeding 0.18 mm. Further, the wire diameter of the tinned copper single wire is 0.04 mm to 0.16 mm.

[0023] The outside of the tinned copper mesh conductor layer 2 is sequentially coated with a PFA extruded inner insulation layer 3, an ETFE wrapped outer insulation layer 4, a copper wire wound inner shielding layer 5, a ferrite thin film wrapped layer 6, a radiation cross-linked high-density polyethylene inner sheath layer 7, a copper wire wound outer shielding layer 8, and a radiation cross-linked high-density polyethylene outer sheath layer 9. Further, the thickness of the PFA extruded inner insulation layer 3 is 2 to 4 times the thickness of the ETFE wrapped outer insulation layer 4. Both the copper wire wound inner shielding layer 5 and the copper wire wound outer shielding layer 8 are formed by arranging a number of fan-shaped silver-plated copper wires side by side and spirally winding. Further, the thickness of the copper wire wound inner shielding layer 5 is less than the thickness of the copper wire wound outer shielding layer 8. Further still, the cross-sectional area of the inner layer fan-shaped silver-plated copper wire of the copper wire wound inner shielding layer 5 is less than the cross-sectional area of the outer layer fan-shaped silver-plated copper wire of the copper wire wound outer shielding layer 8. The shielding coverage rate of the copper wire wound inner shielding layer 5 and the copper wire wound outer shielding layer 8 is 90% to 98%. In one embodiment, the ferrite thin film wrapped layer 6 is a ferrite thin film multi-layer overlapping wrapped structure. The winding direction of the ferrite thin film wrapped layer 6 is opposite to the winding direction of the copper wire wound inner shielding layer 5. The thickness of the ferrite thin film wrapped layer 6 is 0.1 mm to 0.3 mm. The thickness of the radiation cross-linked high-density polyethylene outer sheath layer 9 is 0.45 mm to 3 mm.

[0024] 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 limiting 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. U-bend resistant and anti-attenuation coaxial cable, characterized by: The invention comprises a polyester staple fiber buffer core material (1), on the outer surface of which a plurality of tinned copper monofilaments with a wire diameter not exceeding 0.18 mm are woven and compressed to form a tinned copper mesh conductor layer (2), the outer surface of which is sequentially coated with a PFA extruded inner insulation layer (3), an ETFE wrapped outer insulation layer (4), a copper wire wound inner shielding layer (5), a ferrite film wrapped layer (6), an irradiated cross-linked high-density polyethylene inner sheath layer (7), a copper wire wound outer shielding layer (8) and an irradiated cross-linked high-density polyethylene outer sheath layer (9), wherein the copper wire wound inner shielding layer (5) and the copper wire wound outer shielding layer (8) are both formed by a plurality of fan-shaped silver-plated copper wires being spirally wound side by side.

2. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The diameter of the tinned copper monofilament is 0.04 mm to 0.16 mm.

3. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The thickness of the PFA extruded inner insulation layer (3) is 2 to 4 times the thickness of the ETFE wrapped outer insulation layer (4).

4. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The ferrite film wrapping layer (6) is a ferrite film multi-layer overlapping wrapping structure.

5. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The winding direction of the ferrite film wrapped layer (6) is opposite to the winding direction of the copper wire wrapped inner shielding layer (5).

6. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The thickness of the radiation cross-linked high-density polyethylene outer sheath layer (9) is 0.45 mm to 3 mm.

7. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The thickness of the ferrite film wrapping layer (6) is 0.1 mm to 0.3 mm.

8. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The shielding coverage of the copper wire wound inner shielding layer (5) and the copper wire wound outer shielding layer (8) is 90% to 98%.

9. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The cross-sectional area of ​​the inner layer of the fan-shaped silver-plated copper wires of the copper wire-wound inner shielding layer (5) is smaller than the cross-sectional area of ​​the outer layer of the fan-shaped silver-plated copper wires of the copper wire-wound outer shielding layer (8).

10. The U-bend resistant and attenuation resistant coaxial cable according to claim 1, characterized in that: The thickness of the copper wire-wound inner shielding layer (5) is less than the thickness of the copper wire-wound outer shielding layer (8).

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