Two-layer stranded tensile multi-core cable with copper-clad aluminum wire cores

Abstract

The utility model discloses a copper-clad aluminum wire core two-layer twisted type tensile multi-core cable, which comprises four three-stranded wire groups, four polyurethane elastomer buffer core tubes, a central polyurethane elastomer tensile core tube, a polyester staple fiber buffer core material, an inner-layer wire core body, an outer-layer wire core body, an outer-layer wire core body, an outer-layer wire core body, an inner-layer wire core body and an outer-layer wire core body, wherein the four polyurethane elastomer buffer core tubes are uniformly distributed around the central polyurethane elastomer tensile core tube; a galvanized steel strand is sleeved in the central polyurethane elastomer tensile core tube, ten twisted-pair wire cores are twisted around the inner-layer wire core body to form an outer-layer wire core body, and the outer part of the outer-layer wire core body is sequentially coated with a polyether polyurethane inner sheath layer, a Kevlar fiber braid layer and a polyether polyurethane outer sheath layer. All the wire cores of the cable are assembled and twisted in two layers, the cable core structure is stable and balanced, the cabling roundness is better, the mechanical strength is higher, the tensile property is better, the load borne by each wire core can be reduced, based on the copper-clad aluminum wire core structure, the conductors have better flexibility, wire and core breakage is inhibited, and the durability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable. Background Art

[0002] In automated industrial production lines, multi-core cables are commonly used in robotics and mobile drive systems. However, twisting all cores together in a single layer results in a larger outer diameter, which is not conducive to the miniaturization and development of adaptive equipment. Furthermore, due to the varying outer diameters of the cores and improper filling, the cables tend to become loose after being laid, significantly affecting the roundness of the cable. This roundness seriously affects the overall roundness of the cable, reducing its overall bending resistance. Furthermore, the elongation and tensile strength of each core vary, making them prone to breakage, affecting the cable's electrical properties and resulting in poor durability. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable. All the cores are twisted in two layers, the cable core structure is stable and balanced, the cable roundness is better, the mechanical strength is higher, and the tensile resistance is better, which helps to reduce the load borne by each core. Based on the copper-clad aluminum wire core structure, the conductor has better flexibility, suppresses the occurrence of wire and core breakage, and has better durability.

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

[0005] Copper clad aluminum wire core two-layer twisted tensile multi-core cable, including four three-twisted wire groups, four polyurethane elastomer buffer core tubes are evenly distributed around the central polyurethane elastomer tensile core tube and twisted together with polyester short fiber buffer core material to form an inner core body, the central polyurethane elastomer tensile core tube is sheathed with galvanized steel stranded wire, ten twisted wire cores are twisted around the inner core body to form an outer core body, the inner core body twist direction is the same as the outer core body twist direction, the outer core body lay length is greater than the inner core body lay length, the outer core body is sequentially covered with a polyether polyurethane inner sheath layer, a Kevlar fiber braided layer and a polyether The three-stranded wire group includes three insulated wire cores and a plurality of polyester staple fiber-filled core strips twisted together to form a three-stranded wire core body. The three-stranded wire core body is externally coated with a nitrile polyvinyl chloride sheath layer. The twisted pair core includes two insulated wire cores that are back-twisted and twisted together with two polyester staple fiber-filled core strips in a cross shape to form a twisted pair core body. The twisted pair core body is externally coated with a nitrile polyvinyl chloride sheath layer. The insulated wire core includes a fine aluminum stranded wire inner conductor layer. A plurality of thick copper strands are twisted around the outside of the fine aluminum stranded wire inner conductor layer to form a thick copper stranded wire outer conductor layer. The outside of the thick copper stranded wire outer conductor layer is coated with a nitrile polyvinyl chloride insulation layer.

[0006] As a preference, the cross section of the insulated wire core is 3.5mm 2 .

[0007] Preferably, the galvanized steel strand is formed by twisting together several galvanized steel wires, and the diameter of the galvanized steel wires is 0.5 mm to 2 mm.

[0008] Preferably, the inner conductor layer of the thin aluminum stranded wire is composed of several aluminum alloy monofilaments with a diameter of 0.04mm to 0.08mm coaxially twisted together, and the thick copper stranded wire is composed of several copper alloy monofilaments with a diameter of 0.08mm to 0.2mm coaxially twisted together.

[0009] Preferably, the inner conductor layer of the thin aluminum stranded wire and the outer conductor layer of the thick copper stranded wire are twisted in the same direction, and the lay length of the outer conductor layer of the thick copper stranded wire is greater than the lay length of the inner conductor layer of the thin aluminum stranded wire.

[0010] Preferably, the lay lengths of the ten twisted pairs of cores are 10 mm to 30 mm and are different from each other.

[0011] Preferably, the polyurethane elastomer tensile-resistant core tube is filled with insulating lubricating silicone grease.

[0012] Preferably, the Kevlar fiber braided layer is a braided structure in which inner and outer double layers of Kevlar threads are spirally wound in opposite directions.

[0013] Preferably, the Kevlar fiber braided layer has a braiding density of not less than 95% and a thickness of not less than 0.3 mm.

[0014] Preferably, the outer surface of the polyether polyurethane inner sheath layer and the inner surface of the polyether polyurethane outer sheath layer are both provided with a thermoplastic polyurethane adhesive layer.

[0015] Beneficial effects of the utility model:

[0016] 1. The four three-twisted wire groups and ten twisted pair cores use the same insulated core. The core conductor is a copper-clad aluminum wire conductor structure consisting of a fine aluminum stranded wire inner conductor layer and a thick copper stranded wire outer conductor layer. The thick copper stranded wire outer conductor layer is tightly wrapped around the outside of the fine aluminum stranded wire inner conductor layer. The conductor structure is compact, the inner conductor layer is more flexible, the outer conductor layer is more rigid and has better bending resistance, and the structural strength is higher, which is conducive to balancing the absorption of cable extension, suppressing wire and core breakage, ensuring good electrical properties of the conductor, extending service life, and improving durability.

[0017] 2. By optimizing the cable core structure, the three-stranded wire group and the twisted pair core are placed in two layers and twisted in layers, which greatly improves the roundness of the cable, makes the cable core structure stable and balanced, and has higher mechanical strength. The central polyurethane elastomer tensile core tube in the inner core is sheathed with galvanized steel strands, which can effectively improve the tensile strength of the cable when it is bent, reduce the extrusion pressure of the polyester staple fiber buffer core material, and add two polyester staple fiber filling core strips to the twisted pair core to absorb energy, improve the bending resistance, and help to suppress the deformation of the twisted pair core structure. The two cores with different elongation and tensile strength are arranged in two layers, and the two layers of cores are twisted in the same direction, which is beneficial to improve the bending resistance and tensile resistance, reduce the load on each core, suppress the breakage of the core, and improve durability.

[0018] 3. The cable adopts a polyether polyurethane inner and outer sheath structure and adds a Kevlar fiber braided layer. The Kevlar wire has high strength and high modulus, which can improve the flexibility and mechanical strength of the cable, protect the sheath layer, and take into account the flexibility of the cable. The cable has better structural stability, helps to avoid wrinkling of the sheath and twisting and deformation of the cable, and has better durability and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic cross-sectional structural diagram of a specific implementation method of this application.

[0020] In the figure: 1-three-twisted wire group, 2-polyurethane elastomer buffer core tube, 3-central polyurethane elastomer tensile core tube, 4-polyester staple fiber buffer core material, 5-inner wire core, 6-galvanized steel stranded wire, 7-twisted pair core, 8-outer wire core, 9-polyether polyurethane inner sheath layer, 10-Kevlar fiber braided layer, 11-polyether polyurethane outer sheath layer, 12-insulated wire core, 13-polyester staple fiber filling core strip, 14-nitrile polyvinyl chloride sheath layer, 15-fine aluminum stranded wire inner conductor layer, 16-thick copper stranded wire outer conductor layer, 17-nitrile polyvinyl chloride insulation layer. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1As shown, the copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable of the embodiment of the present invention includes four three-twisted wire groups 1, four polyurethane elastomer buffer core tubes 2 evenly distributed around the central polyurethane elastomer tensile-resistant core tube 3 and twisted together with the polyester short fiber buffer core material 4 to form an inner layer wire core 5, and the central polyurethane elastomer tensile-resistant core tube 3 is sheathed with a galvanized steel strand 6, and the polyurethane elastomer tensile-resistant core tube 3 is filled with insulating lubricating silicone grease. Specifically, the galvanized steel strand 6 is formed by twisting a number of galvanized steel wires, and the diameter of the galvanized steel wire is 0.5mm to 2mm. Ten twisted pairs of cores 7 are twisted around the inner layer wire core 5 to form an outer layer wire core 8. Furthermore, the lay pitch of the ten twisted pairs of cores 7 is 10mm to 30mm and is different from each other. The lay direction of the inner layer wire core 5 is the same as that of the outer layer wire core 8, and the lay pitch of the outer layer wire core 8 is greater than the lay pitch of the inner layer wire core 5.

[0023] The three-twisted wire group 1 includes three insulated wire cores 12 and a plurality of polyester staple fiber filled core strips 13 twisted together to form a three-twisted wire core body, and the three-twisted wire core body is coated with a nitrile polyvinyl chloride sheath layer 14. The twisted pair core 7 includes two insulated wire cores 12 twisted back and evenly distributed with two polyester staple fiber filled core strips 13 in a cross shape to form a twisted pair core body, and the twisted pair core body is coated with a nitrile polyvinyl chloride sheath layer 14. In one embodiment, the cross section of the insulated wire core 12 is 3.5mm 2 . The insulated wire core 12 includes a fine aluminum stranded wire inner conductor layer 15, and a plurality of thick copper stranded wires are twisted around the outside of the fine aluminum stranded wire inner conductor layer 15 to form a thick copper stranded wire outer conductor layer 16. Specifically, the fine aluminum stranded wire inner conductor layer 15 is composed of a plurality of aluminum alloy single wires with a wire diameter of 0.04mm to 0.08mm concentrically twisted, and the thick copper stranded wire is composed of a plurality of copper alloy single wires with a wire diameter of 0.08mm to 0.2mm concentrically twisted. Furthermore, the fine aluminum stranded wire inner conductor layer 15 and the thick copper stranded wire outer conductor layer 16 have the same twisting direction, and the twist pitch of the thick copper stranded wire outer conductor layer 16 is greater than the twist pitch of the fine aluminum stranded wire inner conductor layer 15. The outside of the thick copper stranded wire outer conductor layer 16 is coated with a nitrile polyvinyl chloride insulation layer 17.

[0024] The outer core 8 is sequentially coated with a polyether polyurethane inner sheath 9, a Kevlar fiber braid 10, and a polyether polyurethane outer sheath 11. Furthermore, both the outer surface of the polyether polyurethane inner sheath 9 and the inner surface of the polyether polyurethane outer sheath 11 are provided with a thermoplastic polyurethane adhesive layer. In one embodiment, the Kevlar fiber braid 10 comprises a double layer of inner and outer Kevlar yarns, each helically wound in counter-rotating directions. The Kevlar fiber braid 10 has a braid density of no less than 95% and a thickness of no less than 0.3 mm.

[0025] The present invention is described through embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. Copper clad aluminum wire core two-layer twisted type tensile-resistant multi-core cable, its characteristics are: The invention comprises four three-twisted wire groups (1), four polyurethane elastomer buffer core tubes (2) uniformly distributed around a central polyurethane elastomer tensile-resistant core tube (3) and twisted together with a polyester short fiber buffer core material (4) to form an inner layer wire core (5), the central polyurethane elastomer tensile-resistant core tube (3) is provided with a galvanized steel strand (6) in the inner sleeve, ten pairs of twisted wire cores (7) are twisted around the inner layer wire core (5) to form an outer layer wire core (8), the inner layer wire core (5) and the outer layer wire core (8) have the same twist direction, the outer layer wire core (8) has a twist pitch greater than the inner layer wire core (5), and the outer layer wire core (8) is sequentially coated with a polyether polyurethane inner sheath layer (9), a Kevlar fiber braided layer (10) and a polyether polyurethane outer sheath layer (11). The three-twisted wire group (1) includes three insulated wire cores (12) and a plurality of polyester staple fiber filling core strips (13) twisted together to form a three-twisted wire core body, the three-twisted wire core body is coated with a nitrile polyvinyl chloride sheath layer (14), the twisted pair core (7) includes two insulated wire cores (12) untwisted and combined with two polyester staple fiber filling core strips (13) to form a twisted pair core body, the twisted pair core body is coated with a nitrile polyvinyl chloride sheath layer (14), the insulated wire core (12) includes a thin aluminum stranded wire inner conductor layer (15), a plurality of thick copper strands are twisted around the thin aluminum stranded wire inner conductor layer (15) to form a thick copper stranded wire outer conductor layer (16), and the thick copper stranded wire outer conductor layer (16) is coated with a nitrile polyvinyl chloride insulation layer (17).

2. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The cross section of the insulated wire core (12) is 3.5 mm 2 .

3. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The thin aluminum stranded wire inner conductor layer (15) is composed of a plurality of aluminum alloy single wires with a wire diameter of 0.04 mm to 0.08 mm, which are coaxially twisted together. The thick copper stranded wire is composed of a plurality of copper alloy single wires with a wire diameter of 0.08 mm to 0.2 mm, which are coaxially twisted together.

4. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The thin aluminum stranded wire inner conductor layer (15) and the thick copper stranded wire outer conductor layer (16) are twisted in the same direction, and the thick copper stranded wire outer conductor layer (16) has a twist pitch greater than that of the thin aluminum stranded wire inner conductor layer (15).

5. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The lay lengths of the ten twisted pairs (7) are different and range from 10 mm to 30 mm.

6. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The polyurethane elastomer tensile-resistant core tube (3) is filled with insulating lubricating silicone grease.

7. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The Kevlar fiber braided layer (10) is a braided structure in which inner and outer double layers of Kevlar lines are spirally wound in opposite directions.

8. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The Kevlar fiber braided layer (10) has a braiding density of not less than 95% and a thickness of not less than 0.3 mm.

9. The copper-clad aluminum wire core two-layer twisted tensile-resistant multi-core cable according to claim 1, characterized in that: The outer surface of the polyether polyurethane inner sheath layer (9) and the inner surface of the polyether polyurethane outer sheath layer (11) are both provided with a thermoplastic polyurethane adhesive layer.

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