Bending-resistant three-layer stranded multi-core shielding cable

Abstract

The utility model discloses an anti-bending three-layer stranded multi-core shielding cable, which comprises a plurality of coaxial wire cores which surround a central ETFE resin core tube and are stranded together with PP resin filling core strips to form a first-layer wire core body, and a broken wire early warning power wire core is sleeved in the central ETFE resin core tube in a clearance manner. A plurality of twisted wire cores are twisted around the first layer of wire core body to form a second layer of wire core body, a plurality of power wire cores are twisted around the second layer of wire core body to form a third layer of wire core body, and an ETFE wrapping antifriction layer, a copper foil layer, a copper-zinc alloy electroplated layer and a polyurethane outer sheath are sequentially wrapped outside the third layer of wire core body. According to the cable, the assembly structure of each wire core in the cable core is optimized, and all the wire cores are arranged in three layers and are stranded in layers, so that the bending resistance is better, the stable shielding performance is ensured, the durability is good, and the hidden danger of safety production is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a bending-resistant three-layer twisted multi-core shielded cable. Background Art

[0002] Shielded cables are used in high-speed data transmission applications. Electrical signals routed through shielded cables can radiate less EMI / RFI to the external environment than electrical signals routed through unshielded cables. Electrical signals transmitted through shielded cables can be better protected from environmental EMI / RFI interference than signals through unshielded cables. In automated industrial production lines, multi-core shielded cables are often used in robots, mobile drive systems, etc. The electromagnetic noise environment of industrial production lines is often very complex, and the radiation or conduction of electromagnetic noise (EMI) may seriously interfere with the normal operation of electromechanical equipment. In this process, an important carrier of electromagnetic noise propagation is the various cables used in production line equipment. Some of them are noise sources, and some are disturbed objects. To combat electromagnetic noise interference on electrical lines, a very important way is to use shielded cables. Ordinary multi-core cables usually twist various cores such as twisted pair cores, power cores, and coaxial cores together in the same layer of cable cores. The noise between control cores and from the power cores can easily cause signal crosstalk, greatly affecting the electrical characteristics. Moreover, the bending resistance of this type of multi-core cable is relatively weak. Due to the different elongation and tensile strength of each core, the cable often breaks after repeated bending during operation, resulting in unstable electrical performance and poor durability, posing a hidden danger to production safety. Summary of the invention

[0003] The utility model aims at the deficiencies of the prior art and aims to solve the technical problem of providing a bending-resistant three-layer twisted multi-core shielded cable. By optimizing the assembly structure of each core in the cable core, all cores are arranged in three layers and twisted in layers, so as to achieve better bending resistance, ensure stable shielding performance, good durability and reduce safety hazards in production.

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

[0005] The invention discloses a bending-resistant three-layer twisted multi-core shielded cable, comprising a plurality of coaxial cores twisted together with a PP resin-filled core strip around a central ETFE resin core tube to form a first-layer wire core body, a gap sleeve in the central ETFE resin core tube is provided with a wire break warning power wire core, a plurality of twisted wire cores are twisted around the first-layer wire core body to form a second-layer wire core body, a plurality of power wire cores are twisted around the second-layer wire core body to form a third-layer wire core body, the winding directions of the first-layer wire core body, the winding directions of the second-layer wire core body and the third-layer wire core body are all the same, the first-layer wire core body lay length, the second-layer wire core body lay length and the third-layer wire core body lay length increase in sequence, the wire break warning power wire core and the power wire core both include a power wire core conductor and an ETFE insulation layer, the outer diameter of the wire break warning power wire core is smaller than the outer diameter of the power wire core, and the outside of the third-layer wire core body is sequentially coated with an ETFE wrapped friction reduction layer, a copper foil layer, a copper-zinc alloy electroplating layer and a polyurethane outer sheath.

[0006] Preferably, the coaxial core includes a central conductor, the outside of which is sequentially coated with a foamed polyethylene extruded inner insulation layer and a polyethylene wrapped outer insulation layer, a plurality of silver-plated copper wires are spirally wound side by side on the outside of the polyethylene wrapped outer insulation layer to form a silver-plated copper wire wrapped inner shielding layer, the outer surface of the silver-plated copper wire wrapped inner shielding layer is electroplated to form a tin-plated outer shielding layer, the outside of the tin-plated outer shielding layer is coated with a foamed polyethylene sheath layer, and a gap is formed between the tin-plated outer shielding layer and the foamed polyethylene sheath layer.

[0007] Preferably, the central conductor is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.04 mm to 0.08 mm.

[0008] Preferably, the gap distance of the gap is not less than 0.05 mm and not more than 0.1 mm.

[0009] Preferably, the twisted pair core comprises two insulating cores and two nylon resin filled core strips which are evenly distributed in a cross shape and twisted together to form a twisted pair core body, and the outside of the twisted pair core body is sequentially coated with a copper-plastic composite wrapped shielding layer and a semi-conductive nylon resin coating layer.

[0010] Preferably, the insulated wire core comprises an inner conductor and an XLPE insulation layer, and the inner conductor is formed by twisting a plurality of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.04 mm.

[0011] Preferably, the copper-plastic composite wrapped shielding layer is a copper-plastic composite tape unidirectional spirally overlapped wrapped structure, and the copper-plastic composite tape comprises an outer layer of copper foil and an inner layer of PET film.

[0012] Preferably, the power line core conductor is composed of a plurality of tinned copper wires with a wire diameter of 0.05 mm to 0.3 mm twisted together.

[0013] Preferably, the outer surface of the copper foil layer is electroplated to form the copper-zinc alloy electroplating layer, and the thickness of the copper-zinc alloy electroplating layer is not greater than 2 μm.

[0014] Preferably, the ETFE wrapped anti-friction layer is a unidirectional spiral overlapping wrapped structure of ETFE resin tape, and the thickness of the ETFE resin tape is 0.03 mm to 0.2 mm.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. By optimizing the cable core structure, the coaxial core, twisted pair core and power core are placed in three layers and twisted separately. Three cores with different elongation and tensile strength are arranged in different layers. The twist direction of each layer of core is consistent, which is beneficial to improve the bending resistance and reduce the difficulty of the production process. The resin core tube, power core insulation layer and wrapping anti-friction layer are all made of ETFE resin, which has small sliding friction resistance and reduces the local stress concentration of each layer of core. The central ETFE resin core tube, ETFE insulation layer and ETFE wrapping anti-friction layer form excellent sliding properties, which is helpful to improve the bending resistance of the cable. The outer core bears the largest torque, and the twist distance of each layer of core increases from the inside to the outside, which is beneficial to inhibit core breakage, improve durability and reduce safety hazards in production.

[0017] 2. By optimizing the overall shielding layer structure and adding a copper-zinc alloy electroplating layer on the outer surface of the copper foil layer, it has sufficient corrosion resistance, is beneficial to protect the copper foil layer, inhibits the oxidation of the copper foil layer, eliminates the discoloration and other degradation caused by oxidation, and the copper foil layer does not contact and rub with the polyurethane outer sheath, improves the bending resistance, helps prevent the copper foil layer from cracking, ensures stable and reliable shielding performance, and has better durability.

[0018] 3. The power line core of the wire break warning maintains a clearance fit with the central ETFE resin core tube. When the cable is bent, it helps to reduce the lateral pressure on the power line core of the wire break warning, inhibit the occurrence of conductor breakage, avoid excessively early wire break warning, and combined with the wire break warning power line core diameter being smaller than the power line core diameter, delayed alarm is prevented, which helps to improve the accuracy of the warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0021] Figure 2It is a schematic diagram of the cross-sectional structure of the coaxial core of the embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the twisted pair core of the embodiment of the utility model;

[0023] In the figure: 1-coaxial core, 2-central ETFE resin core tube, 3-PP resin filled core strip, 4-first layer wire core body, 5-break warning power core, 6-twisted pair core, 7-second layer wire core body, 8-power core, 9-third layer wire core body, 10-power core conductor, 11-ETFE insulation layer, 12-ETFE wrapped friction reduction layer, 13-copper foil layer, 14-copper-zinc alloy electroplating layer, 15-polyurethane outer sheath, 16-center conductor, 17-foamed polyethylene extruded inner insulation layer, 18-polyethylene wrapped outer insulation layer, 19-silver-plated copper wire wrapped inner shielding layer, 20-tinned outer shielding layer, 21-gap, 22-foamed polyethylene sheath layer, 24-insulated core, 25-nylon resin filled core strip, 26-copper-plastic composite wrapped shielding layer, 27-semi-conductive nylon resin coating layer, 28-inner conductor, 29-XLPE insulation layer. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the utility model, the utility model is further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the utility model.

[0025] See also Figure 1 The bending-resistant three-layer twisted multi-core shielded cable of the utility model embodiment includes a plurality of coaxial cores 1 surrounding a central ETFE resin core tube 2 and twisted together with a PP resin-filled core strip 3 to form a first-layer wire core body 4. A power line core 5 with a wire break warning is sleeved in the gap inside the central ETFE resin core tube 2. The power line core 5 with a wire break warning function includes a power line core conductor 10 with a wire break warning function and an ETFE insulation layer 11. Furthermore, the power line core conductor 10 with a wire break warning function is composed of a plurality of tinned copper wires with a wire diameter of 0.05 mm to 0.3 mm twisted together.

[0026] like Figure 2As shown, in one embodiment, the coaxial core 1 includes a central conductor 16, specifically, the central conductor 16 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.04 mm to 0.08 mm twisted together. The outer portion of the central conductor 16 is sequentially coated with a foamed polyethylene extruded inner insulation layer 17 and a polyethylene wrapped outer insulation layer 18, a plurality of silver-plated copper wires are spirally wound side by side on the outer portion of the polyethylene wrapped outer insulation layer 18 to form a silver-plated copper wire wrapped inner shielding layer 19, the outer surface of the silver-plated copper wire wrapped inner shielding layer 19 is electroplated to form a tin-plated outer shielding layer 20, the outer portion of the tin-plated outer shielding layer 20 is coated with a foamed polyethylene sheath layer 22, a gap 21 is formed between the tin-plated outer shielding layer 20 and the foamed polyethylene sheath layer 22, and further, the gap distance of the gap 21 is not less than 0.05 mm and not more than 0.1 mm.

[0027] A plurality of twisted wire cores 6 are twisted around the first layer of wire core 4 to form a second layer of wire core 7. Figure 3 As shown, in one embodiment, the twisted wire core 6 includes two insulated wire cores 24 and two nylon resin filled core strips 25 evenly distributed in a cross shape and twisted together to form a twisted wire core body. Further, the insulated wire core 24 includes an inner conductor 28 and an XLPE insulation layer 29, and the inner conductor 28 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.02mm to 0.04mm. The outer part of the twisted wire core body is sequentially coated with a copper-plastic composite wrapped shielding layer 26 and a semi-conductive nylon resin coating layer 27. In one embodiment, the copper-plastic composite wrapped shielding layer 26 is a copper-plastic composite tape unidirectional spiral lapped wrapped structure, and the copper-plastic composite tape includes an outer layer of copper foil and an inner layer of PET film.

[0028] A plurality of power cores 8 are twisted around the second layer core body 7 to form a third layer core body 9, the power core 8 comprises a power core conductor 10 and an ETFE insulation layer 11, further, the power core conductor 10 is a plurality of tinned copper wires with a diameter of 0.05 mm to 0.3 mm twisted together. The outer diameter of the disconnection warning power core 5 is smaller than the outer diameter of the power core 8.

[0029] The winding direction of the first layer of wire core 4, the winding direction of the second layer of wire core 7 and the winding direction of the third layer of wire core 9 are all the same, and the lay length of the first layer of wire core 4, the lay length of the second layer of wire core 7 and the lay length of the third layer of wire core 9 increase successively. The third layer of wire core 9 is coated with an ETFE wrapping anti-friction layer 12, a copper foil layer 13, a copper-zinc alloy electroplating layer 14 and a polyurethane outer sheath 15 in sequence. Furthermore, the outer surface of the copper foil layer 13 is electroplated to form the copper-zinc alloy electroplating layer 14, and the thickness of the copper-zinc alloy electroplating layer 14 is not more than 2μm. In one embodiment, the ETFE wrapping anti-friction layer 12 is a unidirectional spiral overlapping wrapping structure of an ETFE resin tape, and the thickness of the ETFE resin tape is 0.03mm to 0.2mm.

[0030] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. Anti-bending three-layer twisted multi-core shielded cable, characterized by: The invention comprises a plurality of coaxial wire cores (1) twisted together around a central ETFE resin core tube (2) and a PP resin filled core strip (3) to form a first layer wire core body (4); a disconnection warning power wire core (5) is sleeved in a gap inside the central ETFE resin core tube (2); a plurality of twisted wire cores (6) twisted around the first layer wire core body (4) to form a second layer wire core body (7); a plurality of power wire cores (8) twisted around the second layer wire core body (7) to form a third layer wire core body (9); the winding direction of the first layer wire core body (4), the winding direction of the second layer wire core body (7) and the third layer wire core body are The winding directions of the wire cores (9) are the same, the lay lengths of the first layer wire core (4), the second layer wire core (7) and the third layer wire core (9) increase in sequence, the wire break warning power wire core (5) and the power wire core (8) both comprise a power wire core conductor (10) and an ETFE insulation layer (11), the outer diameter of the wire break warning power wire core (5) is smaller than the outer diameter of the power wire core (8), and the third layer wire core (9) is coated with an ETFE wrapped friction reduction layer (12), a copper foil layer (13), a copper-zinc alloy electroplating layer (14) and a polyurethane outer sheath (15) in sequence.

2. The bending-resistant three-layer twisted multi-core shielded cable according to claim 1 is characterized in that: The coaxial core (1) comprises a central conductor (16), the central conductor (16) is coated with a foamed polyethylene extruded inner insulation layer (17) and a polyethylene wrapped outer insulation layer (18) in sequence, a plurality of silver-plated copper wires are spirally wound side by side on the outside of the polyethylene wrapped outer insulation layer (18) to form a silver-plated copper wire wrapped inner shielding layer (19), the outer surface of the silver-plated copper wire wrapped inner shielding layer (19) is electroplated to form a tin-plated outer shielding layer (20), the tin-plated outer shielding layer (20) is coated with a foamed polyethylene sheath layer (22), and a gap (21) is formed between the tin-plated outer shielding layer (20) and the foamed polyethylene sheath layer (22).

3. The bending-resistant three-layer twisted multi-core shielded cable according to claim 2 is characterized in that: The central conductor (16) is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.04 mm to 0.08 mm twisted together.

4. The bending-resistant three-layer twisted multi-core shielded cable according to claim 2 is characterized in that: The gap distance of the gap (21) is not less than 0.05 mm and not more than 0.1 mm.

5. The bending-resistant three-layer twisted multi-core shielded cable according to claim 1 is characterized in that: The twisted wire core (6) comprises two insulating wire cores (24) and two nylon resin filled core strips (25) which are evenly distributed in a cross shape and twisted together to form a twisted wire core body, and the outside of the twisted wire core body is sequentially coated with a copper-plastic composite wrapped shielding layer (26) and a semi-conductive nylon resin coating layer (27).

6. The bending-resistant three-layer twisted multi-core shielded cable according to claim 5 is characterized in that: The insulated wire core (24) comprises an inner conductor (28) and an XLPE insulation layer (29); the inner conductor (28) is formed by twisting a plurality of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.04 mm.

7. The bending-resistant three-layer twisted multi-core shielded cable according to claim 5 is characterized in that: The copper-plastic composite wrapped shielding layer (26) is a copper-plastic composite tape unidirectionally spirally overlapped wrapped structure, and the copper-plastic composite tape comprises a copper foil outer layer and a PET film inner layer.

8. The bending-resistant three-layer twisted multi-core shielded cable according to claim 1 is characterized in that: The power line core conductor (10) is composed of a plurality of tinned copper wires with a wire diameter of 0.05 mm to 0.3 mm twisted together.

9. The bending-resistant three-layer twisted multi-core shielded cable according to claim 1 is characterized in that: The outer surface of the copper foil layer (13) is electroplated to form the copper-zinc alloy electroplated layer (14), and the thickness of the copper-zinc alloy electroplated layer (14) is not greater than 2 μm.

10. The bending-resistant three-layer twisted multi-core shielded cable according to claim 1 is characterized in that: The ETFE wrapped anti-friction layer (12) is a unidirectional spiral overlapping wrapped structure of an ETFE resin tape, and the thickness of the ETFE resin tape is 0.03 mm to 0.2 mm.

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