CN215988146U

CN215988146U - Durable conductive fiber coaxial cable

Info

Publication number: CN215988146U
Application number: CN202122161771.7U
Authority: CN
Inventors: 李亚龙; 施博文; 陈浩; 谭广叙; 王涛; 周饰敏
Original assignee: Zhejiang Zhongda Yuantong Cable Technology Co ltd
Current assignee: Zhejiang Zhongda Yuantong Cable Technology Co ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-03-08
Anticipated expiration: 2031-09-08

Abstract

The utility model discloses a durable conductive fiber coaxial cable which comprises an oval center core material, wherein the center core material is formed by stranding a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tin-coated copper monofilaments with the wire diameter of 0.08-0.15 mm surround the center core material and are stranded to form an inner conductor, a silane grafted crosslinked foamed polyethylene insulating layer, a silane grafted crosslinked linear low-density polyethylene insulating protective layer, a conductive fiber wound shielding layer and a polyurethane outer sheath are sequentially coated outside the inner conductor, the conductive fiber wound shielding layer is a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by stranding two polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating, the wire diameter of the polyacrylonitrile-based carbon fiber is not more than 25 mu m, and the outer diameter of the polyurethane outer sheath is 1.6-4.5 mm. The cable has better bending resistance, stable shielding effect and durable use.

Description

Durable conductive fiber coaxial cable

Technical Field

The application belongs to the technical field of cables, and particularly relates to a durable conductive fiber coaxial cable.

Background

Coaxial cables are one of the main varieties of wire cables. The coaxial cable needs to have good flexibility and shielding performance. In an automated industrial manufacturing line, electrical connection and control of small robots, electronic machines, and the like are required to be applied to a coaxial cable having high flexibility and bending resistance, and such a coaxial cable must also have good electrical characteristics for long-distance transmission. However, after a common coaxial cable is repeatedly bent for a long time, the shielding effect is unstable, the signal attenuation is large, the electrical characteristics are greatly affected, and the durability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the technical problem that solve provides a durable type conductive fiber coaxial cable, based on lightweight preparation, the bending resistance is better, and difficult conductor deformation broken string that appears takes place, and the shielding effect is stable, and durable use is better.

The present application solves the above-mentioned problems by the following technical solutions.

The durable conductive fiber coaxial cable comprises an oval center core material, wherein the center core material is formed by stranding a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tinned copper monofilaments with the wire diameter of 0.08-0.15 mm surround the outside of the center core material and are stranded to form an inner conductor, the outside of the inner conductor is sequentially coated with a silane grafted crosslinked foamed polyethylene insulating layer, a silane grafted crosslinked linear low-density polyethylene insulating protective layer, a conductive fiber wound shielding layer and a polyurethane outer sheath, the conductive fiber wound shielding layer is a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by stranding two polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating layer, the wire diameter of the polyacrylonitrile-based carbon fiber is not more than 25 mu m, and the outer diameter of the polyurethane outer sheath is 1.6-4.5 mm.

Preferably, the long axis of the center core is not more than 1.2mm, and the short axis of the center core is not less than 0.15 mm.

Preferably, the polyacrylonitrile-based carbon fiber having a large linear diameter has a linear diameter of 12 to 20 μm, and the polyacrylonitrile-based carbon fiber having a small linear diameter has a linear diameter of 5 to 12 μm.

Preferably, the thickness ratio of the silane grafted crosslinked foamed polyethylene insulation layer to the silane grafted crosslinked linear low density polyethylene insulation protective layer is 1.45:1 to 2: 1.

Preferably, the total thickness of the silane grafted crosslinked foamed polyethylene insulation layer and the silane grafted crosslinked linear low density polyethylene insulation protective layer is 0.45mm to 2.2 mm.

Preferably, the silane-grafted crosslinked foamed polyethylene insulation layer is a silane-grafted crosslinked foamed polyethylene resin layer having a foaming ratio of 70% to 85%.

Preferably, the conductive fiber wound shielding layer is a unidirectional spiral winding structure of conductive fiber bundles, and the spiral angle is 40-55 degrees.

Preferably, the outer diameter of the inner conductor does not exceed 1.8 mm.

Preferably, the lay length of the inner conductor is five to twelve times the outer diameter of the inner conductor.

Preferably, the twist direction of the center core material is the same as the twist direction of the inner conductor.

The beneficial effect of this application:

1. the tensile elastic modulus of the para-type wholly aromatic copolyamide drawn fiber is large, the tensile strength of the inner conductor is improved, the flexibility of the inner conductor is better, the structure of the central core material is elliptical, the central core material is flat when being extruded and deformed in the bending process of the cable, the dislocation offset is formed between the central point of the central core material and the central point of the inner conductor, the load stress applied to the inner conductor can be effectively relieved, the local stress concentration of the inner conductor is reduced, the phenomenon that the conductor is deformed and broken is reduced, the flexibility and the bending resistance are improved, the weight and diameter of the conductor are reduced, the stable electrical property is kept, and the durability and the usability are better.

2. The conductive fiber winding shielding layer is of a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by twisting two kinds of polyacrylonitrile-based carbon fibers with different wire diameters and coating copper conductive coatings, so that the copper conductive coatings and the outer surfaces of the polyacrylonitrile-based carbon fibers are more firmly coated, gaps between the fibers are better penetrated and covered, the stability of shielding characteristics is ensured, and the durability and the usability are better.

3. The silane grafted crosslinked foamed polyethylene insulating layer can reduce dielectric constant and dielectric loss, reduce capacitance and attenuation of the cable, and the tensile strength and the elongation of the silane grafted crosslinked linear low-density polyethylene insulating protective layer are greater than those of the silane grafted crosslinked foamed polyethylene insulating layer, so that when the cable is subjected to bending and twisting, the silane grafted crosslinked foamed polyethylene insulating layer can keep sliding performance with the silane grafted crosslinked foamed polyethylene insulating layer and provide effective protection, the silane grafted crosslinked foamed polyethylene insulating layer is prevented from being torn and wrinkled, the electric insulating property is ensured, and the durability and the usability are better.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the present application.

Description of reference numerals:

1-a central core material, 2-an inner conductor, 3-a silane grafted crosslinked foamed polyethylene insulating layer, 4-a silane grafted crosslinked linear low-density polyethylene insulating protective layer, 5-a conductive fiber winding shielding layer and 6-a polyurethane outer sheath.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, the durable conductive fiber coaxial cable according to the embodiment of the present application includes an elliptical center core 1, where the center core 1 is formed by twisting a plurality of para-type wholly aromatic copolyamide drawn fibers, specifically, a major axis of the center core 1 is not more than 1.2mm, and a minor axis of the center core 1 is not less than 0.15 mm. And a plurality of tinned copper monofilaments with the wire diameter of 0.08mm to 0.15mm are twisted around the outside of the central core material 1 to form the inner conductor 2, and preferably, the twisting direction of the central core material 1 is the same as that of the inner conductor 2. Specifically, the lay length of the inner conductor 2 is five to twelve times of the outer diameter of the inner conductor 2, and the outer diameter of the inner conductor 2 is not more than 1.8 mm.

The outer part of the inner conductor 2 is sequentially coated with a silane grafted crosslinked foamed polyethylene insulating layer 3, a silane grafted crosslinked linear low-density polyethylene insulating protective layer 4, a conductive fiber winding shielding layer 5 and a polyurethane outer sheath 6. Specifically, the silane-grafted crosslinked foamed polyethylene insulation layer 3 is a silane-grafted crosslinked foamed polyethylene resin layer having a foaming rate of 70% to 85%, the thickness ratio of the silane-grafted crosslinked foamed polyethylene insulation layer 3 to the silane-grafted crosslinked linear low-density polyethylene insulation protective layer 4 is 1.45:1 to 2:1, and further, the total thickness of the silane-grafted crosslinked foamed polyethylene insulation layer 3 and the silane-grafted crosslinked linear low-density polyethylene insulation protective layer 4 is 0.45mm to 2.2 mm. The conductive fiber winding shielding layer 5 is a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by twisting two polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating, the wire diameter of the polyacrylonitrile-based carbon fiber is not more than 25 mu m, specifically, the wire diameter of the polyacrylonitrile-based carbon fiber with the large wire diameter is 12 mu m to 20 mu m, and the wire diameter of the polyacrylonitrile-based carbon fiber with the small wire diameter is 5 mu m to 12 mu m. Further, the conductive fiber winding shielding layer 5 is a conductive fiber bundle unidirectional spiral winding structure and has a spiral angle of 40 degrees to 55 degrees. The outer diameter of the polyurethane outer sheath 6 is 1.6 mm-4.5 mm.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. Durable type conductive fiber coaxial cable, characterized by: comprises an oval center core material (1), wherein the center core material (1) is formed by twisting a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tin-plated copper monofilaments with the wire diameter of 0.08mm to 0.15mm surround the outside of the center core material (1) and are twisted to form an inner conductor (2), the outer part of the inner conductor (2) is sequentially coated with a silane grafted crosslinked foamed polyethylene insulating layer (3), a silane grafted crosslinked linear low-density polyethylene insulating protective layer (4), a conductive fiber winding shielding layer (5) and a polyurethane outer sheath (6), the conductive fiber winding shielding layer (5) is a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by twisting two kinds of polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating layer, the linear diameter of the polyacrylonitrile-based carbon fiber is not more than 25 mu m, and the outer diameter of the polyurethane outer sheath (6) is 1.6mm to 4.5 mm.

2. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the long axis of the central core material (1) is not more than 1.2mm, and the short axis of the central core material (1) is not less than 0.15 mm.

3. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the polyacrylonitrile-based carbon fiber with the large linear diameter has the linear diameter of 12-20 μm, and the polyacrylonitrile-based carbon fiber with the small linear diameter has the linear diameter of 5-12 μm.

4. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the thickness ratio of the silane grafted crosslinked foamed polyethylene insulation layer (3) to the silane grafted crosslinked linear low-density polyethylene insulation protective layer (4) is 1.45:1 to 2: 1.

5. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the total thickness of the silane grafted crosslinked foamed polyethylene insulating layer (3) and the silane grafted crosslinked linear low-density polyethylene insulating protective layer (4) is 0.45mm to 2.2 mm.

6. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the conductive fiber winding shielding layer (5) is of a conductive fiber bundle unidirectional spiral winding structure, and the spiral angle is 40-55 degrees.

7. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the outer diameter of the inner conductor (2) is not more than 1.8 mm.

8. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the twisting distance of the inner conductor (2) is five to twelve times of the outer diameter of the inner conductor (2).

9. The durable, electrically conductive fiber coaxial cable of claim 1, wherein: the twisting direction of the central core material (1) is the same as that of the inner conductor (2).