Torsion-resistant and attenuation-resistant coaxial cable

Abstract

The utility model discloses a torsion-resistant attenuation-resistant coaxial cable, which is characterized in that a silver-plated copper net conductor layer is formed on the outer surface of a stainless steel monofilament conductor by weaving and pressing a plurality of silver-plated copper monofilaments with the wire diameter not less than 0.2 mm; an FEP extruded inner insulating layer, a PTFE lapped outer insulating layer, a copper wire wound inner shielding layer, a copper wire wound outer shielding layer, a ferrite film inner cushion layer and a PFA extruded sheath layer are sequentially wrapped outside the copper net conductor layer, and a plurality of inner-layer fan-shaped silver-plated copper wires are spirally wound outside the PTFE lapped outer insulating layer side by side to form the copper wire wound inner shielding layer. A plurality of outer-layer fan-shaped silver-plated copper wires are spirally wound outside the copper wire winding inner shielding layer side by side to form a copper wire winding outer shielding layer, and the outer diameter of the PFA extruded sheath layer is 4.6 mm to 5 mm. The shielding layer of the coaxial cable is better in torsion resistance, not easy to break, favorable for reducing signal attenuation, stable in shielding performance and durable in application.

Description

Technical Field

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

[0002] Coaxial cable is one of the main types 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 circular copper wire winding shielding, and the gaps formed between the circular 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. 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 torsion-resistant and attenuation-resistant coaxial cable, which has high mechanical strength of the shielding layer, better torsion resistance, the conductor and the shielding layer are not easy to break, helps to reduce the signal attenuation, has stable shielding performance, and can be durably applied.

[0004] The above technical problem is solved by the following technical solutions in this application.

[0005] The torsion-resistant and attenuation-resistant coaxial cable includes a stainless steel single wire conductor. On the outer surface of the stainless steel single wire conductor, a silver-plated copper wire mesh conductor layer is formed by braiding and compacting a number of silver-plated copper single wires with a wire diameter of not less than 0.2 mm. The outside of the copper wire mesh conductor layer is sequentially coated with an FEP extrusion inner insulation layer, a PTFE wrapping outer insulation layer, a copper wire winding inner shielding layer, a copper wire winding outer shielding layer, a ferrite film inner cushion layer, and a PFA extrusion sheath layer. A number of inner layer sector silver-plated copper wires are spirally wound side by side outside the PTFE wrapping outer insulation layer to form the copper wire winding inner shielding layer, and a number of outer layer sector silver-plated copper wires are spirally wound side by side outside the copper wire winding inner shielding layer to form the copper wire winding outer shielding layer. The inner circumferential butt joint surfaces in contact between adjacent inner layer sector silver-plated copper wires and the outer circumferential butt joint surfaces in contact between adjacent outer layer sector silver-plated copper wires are arranged in a circumferential staggered manner. The outer diameter of the PTFE wrapping outer insulation layer is 3 mm to 3.5 mm, and the outer diameter of the PFA extrusion sheath layer is 4.6 mm to 5 mm.

[0006] Preferably, the shielding coverage rates of both the copper wire winding inner shielding layer and the copper wire winding outer shielding layer are not less than 95%.

[0007] Preferably, the thickness of the copper wire winding inner shielding layer is less than the thickness of the copper wire winding outer shielding layer.

[0008] Preferably, the thickness of the FEP extruded inner insulating layer is 2 to 5 times the thickness of the PTFE wrapped outer insulating layer.

[0009] Preferably, the wire diameter of the stainless steel single wire conductor is larger than that of the silver-plated copper single wire.

[0010] Preferably, the thickness of the ferrite film inner cushion layer is 0.1 mm to 0.3 mm.

[0011] Preferably, a thermoplastic EVA adhesive layer is provided on the inner surface of the PFA extruded sheath layer.

[0012] Preferably, the cross-sectional area of the inner layer sector silver-plated copper wire is smaller than that of the outer layer sector silver-plated copper wire.

[0013] Advantages of this application:

[0014] 1. By improving the original round copper wire winding shielding structure into a double-layer winding shielding structure of inner and outer layer sector silver-plated copper wires, the flexibility is better, the mechanical strength of the shielding layer is improved. The double-layer winding of sector silver-plated copper wires helps to slow down the stress concentration, reduce the torque force during bending, improve the torsional resistance and bending resistance. The inner circumferential butt joint surfaces in contact between adjacent inner layer sector silver-plated copper wires and the outer circumferential butt joint surfaces in contact between adjacent outer layer sector silver-plated copper wires are arranged in a circumferential staggered manner, which is beneficial to suppressing the occurrence of copper wire breakage easily caused by the mutual contact and friction of the inner circumferential butt joint surfaces and the outer circumferential butt joint surfaces under stress, helps to reduce the signal attenuation amount, and improves the stability of the shielding performance for durable application.

[0015] 2. By using a stainless steel single wire conductor as the inner core, it helps to improve the mechanical strength and bending resistance of the inner conductor. A silver-plated copper wire mesh conductor layer is formed by weaving and tightly pressing silver-plated copper single wires on the outer surface of the stainless steel single wire conductor. The silver-plated copper wire mesh conductor layer with a close structure has better flexibility and bending resistance, will not become loose, reduces the occurrence of wire breakage, and has better durability for application.

[0016] 3. The ferrite film inner cushion layer and the PFA extruded sheath layer are bonded into one body through an adhesive layer. When bending, the PFA extruded sheath layer and the ferrite film inner cushion layer maintain the same degree of bending and are closely attached to the shielding layer, suppressing the shielding layer from locally bearing excessive load, reducing the local stress concentration of the shielding layer, and helping to improve the stability of the shielding effect for durable application. Description of the Drawings

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

[0018] Description of the reference numerals:

[0019] 1 - Stainless steel single - wire conductor, 2 - Silver - plated copper mesh conductor layer, 3 - FEP extruded inner insulation layer, 4 - PTFE wrapped outer insulation layer, 5 - Copper wire wound inner shielding layer, 6 - Copper wire wound outer shielding layer, 7 - Ferrite film inner cushion layer, 8 - PFA extruded sheath layer. Specific embodiments

[0020] The terms used in the embodiment part of this application are only for explaining the specific embodiments of this application, rather than aiming to limit this application. The embodiments of this application will be described in detail below with reference to the drawings.

[0021] See Figure 1 , the torsion - resistant and attenuation - resistant coaxial cable of the embodiment of this application includes a stainless steel single - wire conductor 1. On the outer surface of the stainless steel single - wire conductor 1, a silver - plated copper mesh conductor layer 2 is formed by braiding and compacting a number of silver - plated copper single - wires with a wire diameter of not less than 0.2 mm. Further, the wire diameter of the stainless steel single - wire conductor 1 is greater than the wire diameter of the silver - plated copper single - wire.

[0022] The outside of the copper mesh conductor layer 2 is successively coated with an FEP extruded inner insulation layer 3, a PTFE wrapped outer insulation layer 4, a copper wire wound inner shielding layer 5, a copper wire wound outer shielding layer 6, a ferrite film inner cushion layer 7, and a PFA extruded sheath layer 8. Further, a thermoplastic EVA adhesive layer is provided on the inner surface of the PFA extruded sheath layer 8. The thickness of the FEP extruded inner insulation layer 3 is 2 to 5 times the thickness of the PTFE wrapped outer insulation layer 4. The outer diameter of the PTFE wrapped outer insulation layer 4 is 3 mm to 3.5 mm. A number of inner - layer fan - shaped silver - plated copper wires are spirally wound side - by - side outside the PTFE wrapped outer insulation layer 4 to form the copper wire wound inner shielding layer 5, and a number of outer - layer fan - shaped silver - plated copper wires are spirally wound side - by - side outside the copper wire wound inner shielding layer 5 to form the copper wire wound outer shielding layer 6. The inner circumferential butt - joint surfaces in contact between adjacent inner - layer fan - shaped silver - plated copper wires and the outer circumferential butt - joint surfaces in contact between adjacent outer - layer fan - shaped silver - plated copper wires are arranged in a circumferential staggered manner. Further, the cross - sectional area of the inner - layer fan - shaped silver - plated copper wire is smaller than the cross - sectional area of the outer - layer fan - shaped silver - plated copper wire, and the thickness of the copper wire wound inner shielding layer 5 is smaller than the thickness of the copper wire wound outer shielding layer 6. The shielding coverage rates of the copper wire wound inner shielding layer 5 and the copper wire wound outer shielding layer 6 are both not less than 95%. The thickness of the ferrite film inner cushion layer 7 is 0.1 mm to 0.3 mm. The outer diameter of the PFA extruded sheath layer 8 is 4.6 mm to 5 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. Torsion-resistant and anti-attenuation coaxial cable, characterized by: The invention comprises a stainless steel monofilament conductor (1), on the outer surface of which a plurality of silver-plated copper monofilaments having a wire diameter of not less than 0.2 mm are woven and pressed to form a silver-plated copper mesh conductor layer (2), the outer surface of which is sequentially coated with an FEP extruded inner insulation layer (3), a PTFE wrapped outer insulation layer (4), a copper wire wrapped inner shielding layer (5), a copper wire wrapped outer shielding layer (6), a ferrite film inner cushion layer (7) and a PFA extruded sheath layer (8), and a plurality of inner fan-shaped silver-plated copper wires are arranged outside the PTFE wrapped outer insulation layer (4). The copper wire wrapped inner shielding layer (5) is formed by spirally winding side by side, and a plurality of outer fan-shaped silver-plated copper wires are spirally wound side by side outside the copper wire wrapped inner shielding layer (5) to form the copper wire wrapped outer shielding layer (6). The inner circumferential butt joint surfaces contacting adjacent inner fan-shaped silver-plated copper wires and the outer circumferential butt joint surfaces contacting adjacent outer fan-shaped silver-plated copper wires are arranged in a circumferentially staggered manner. The outer diameter of the PTFE wrapped outer insulation layer (4) is 3 mm to 3.5 mm, and the outer diameter of the PFA extruded sheath layer (8) is 4.6 mm to 5 mm.

2. The torsion-resistant and anti-attenuation coaxial cable according to claim 1 is characterized in that: The shielding coverage of the copper wire-wound inner shielding layer (5) and the copper wire-wound outer shielding layer (6) is not less than 95%.

3. The torsion-resistant and anti-attenuation coaxial cable according to claim 1 is 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 (6).

4. The torsion-resistant and anti-attenuation coaxial cable according to claim 1 is characterized in that: The thickness of the FEP extruded inner insulating layer (3) is 2 to 5 times the thickness of the PTFE wrapped outer insulating layer (4).

5. The torsion-resistant and anti-attenuation coaxial cable according to claim 1 is characterized in that: The wire diameter of the stainless steel monofilament conductor (1) is greater than the wire diameter of the silver-plated copper monofilament.

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

7. The torsion-resistant and anti-attenuation coaxial cable according to claim 1 is characterized in that: The inner surface of the PFA extruded sheath layer (8) is provided with a thermoplastic EVA adhesive layer.

8. The torsion-resistant and anti-attenuation coaxial cable according to claim 1, characterized in that: The cross-sectional area of ​​the inner fan-shaped silver-plated copper wire is smaller than the cross-sectional area of ​​the outer fan-shaped silver-plated copper wire.

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