Flexible self-marking water-resistant cable

Abstract

The utility model discloses a kind of flexible self-marking waterproof cables, belong to cable technical field, including conductor, sheath layer, the outside of conductor is provided with sheath, conductor includes core material, wire, core material is arranged in the center of conductor, the outside of core material is provided with multiple asymmetric alternate stranding wire, wire is divided into three layers stranding from inside to outside;Sheath layer is made of TPU;The outside of sheath layer is also provided with surface layer, surface layer is made of polyurethane, the outside of surface layer is arranged with at least two grooves, and groove can be manually broken and connected between them. Through the utility model, core material can bear cable axial tensile load, stress is balanced when bending, flexibility and tensile strength are improved. The outside of core material is provided with asymmetric alternate stranding conductor, from inside to outside three layers galvanized copper wire are formed by 5:7:9 pitch reverse alternate stranding. When cable bends, tension and pressure are dispersed and alternately borne, stress is no longer concentrated on single fiber, and minimum bending radius is greatly reduced.

Description

Technical Field

[0001] This utility model relates to a flexible self-marking waterproof cable, belonging to the field of cable technology. Background Technology

[0002] With the rapid development of data centers, industrial automation, and intelligent manufacturing, the performance requirements for cables are becoming increasingly stringent. On the one hand, high-density cabling and long-life bending are needed in confined spaces or among moving parts; on the other hand, for ease of maintenance and management, cables must be directly identifiable on-site and remain clearly marked over the long term. Furthermore, industrial environments often contain moisture, oil, and other contaminants. Even minor scratches or cracks in cables can easily lead to water loss and short circuits, severely impacting system reliability.

[0003] Existing flexible cables on the market typically improve tensile and flexural strength by adding multiple layers of metal armor or high-modulus fiber reinforcement to the outer layer of the conductor. Waterproof performance mainly relies on thick-walled plastic or rubber sheaths, sometimes with water-resistant labels affixed to the sheath surface for identification. While this design is effective in improving mechanical strength and waterproof ratings, it reveals many shortcomings in scenarios where wiring space is limited, frequent bending is required, and on-site marking is necessary.

[0004] Therefore, a flexible, self-marking waterproof cable needs to be designed to solve the problems of traditional cables having a large outer diameter, limited flexibility, high waterproof maintenance costs, and inconvenient marking. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a flexible self-marking waterproof cable, which solves the problems of traditional cables having a large outer diameter, limited flexibility, high waterproof maintenance costs, and inconvenient marking.

[0006] The technical problem to be solved by this utility model is achieved by the following technical solution: a flexible self-marking waterproof cable.

[0007] include

[0008] Conductor, sheath layer,

[0009] The outer side of the conductor is provided with the sheath.

[0010] The conductor includes a core material and wires. The core material is disposed at the center of the conductor, and multiple asymmetrically twisted wires are disposed on the outer side of the core material. The wires are twisted in three layers from the inside to the outside.

[0011] The sheath layer is made of TPU;

[0012] The outer side of the sheath layer is also provided with a surface layer, which is made of polyurethane. At least two grooves are arranged on the outer side of the surface layer, and the grooves can be manually cut to connect them.

[0013] Preferably, the conductor comprises galvanized copper wire.

[0014] Preferably, the stranding direction of the conductors in each layer alternates, and the pitch ratio of the conductors from the inner layer to the outer layer is 5:7:9.

[0015] Preferably, the sheath layer is formed on the outside of the conductor by twin-screw extrusion molding.

[0016] Preferably, the core material comprises aramid fiber.

[0017] Preferably, the grooves are formed by molding, and the grooves can be arranged to form a certain shape.

[0018] The beneficial effects of this utility model are:

[0019] (1) Through this utility model, a core material is arranged longitudinally at the center of the conductor. The core material is made of aramid fiber, which can bear the axial tensile load of the cable, balance the mechanical stress during bending, and improve flexibility and tensile strength. An asymmetrical alternating stranded conductor is set on the outside of the core material, which is made of three layers of galvanized copper wires twisted alternately in opposite directions at a pitch of 5:7:9 from the inside to the outside. When the cable is bent, the tensile and compressive stress is distributed and alternately borne, the stress is no longer concentrated on a single fiber, the minimum bending radius is greatly reduced, and the fatigue life is significantly extended.

[0020] (2) Through this utility model, the sheath layer is made of TPU, and disulfide polymer is set inside the TPU. When the surface of the sheath layer is torn, the sheath layer can close the surface tear within 24 hours when it comes into contact with water, so that the sheath layer can be restored to IP67 waterproof rating. This reduces the need for repair and replacement due to leakage caused by micro-damage.

[0021] (3) With this utility model, a surface layer is provided on the outside of the sheath layer. The surface layer is made of polyurethane and has micro-grooves that can be manually scratched formed by a mold. The spacing between the grooves can be broken and connected, and the pattern formed can be preserved for a long time. Maintenance personnel do not need to add labels or worry about obscuring the sheath. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the conductor structure of this utility model.

[0024] In the diagram: 1-Conductor, 11-Core material, 12-Inner conductor, 13-Middle conductor, 14-Outer conductor, 2-Sheath layer, 3-Surface layer. Detailed Implementation

[0025] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, a flexible self-marking waterproof cable includes a conductor 1 and a sheath layer 2, with the sheath layer 2 disposed on the outside of the conductor 1.

[0028] Reference Figure 1 , Figure 2 The conductor 1 includes a core material 11 and multiple wires. The core material 11 is located at the center of the conductor 1. Multiple asymmetrically twisted wires are arranged on the surface of the core material 11. The wires are arranged on the surface of the core material 11 by twisting. The wires are twisted in three layers from the inside to the outside, and the twisting direction between the layers is alternating, which can disperse the local stress received by the conductor.

[0029] In this embodiment, in conductor 1, an inner conductor 12 is disposed on the outer side of the core material 11, a middle conductor 13 is disposed on the outer side of the inner conductor 12, and an outer conductor 14 is disposed on the outer side of the middle conductor 13.

[0030] The inner conductor 12 consists of 7 strands of tin-plated copper wire with a pitch of 0.5 mm; the middle conductor 13 consists of 12 strands of tin-plated copper wire with a pitch of 0.7 mm, and the stranding direction of the tin-plated copper wires in the middle conductor 13 is opposite to that of the inner conductor 12; the outer conductor 14 consists of 19 strands of tin-plated copper wire with a pitch of 0.9 mm, and the stranding direction of the outer tin-plated copper wires is opposite to that of the middle conductor 13 but the same as that of the inner conductor 12. Each layer is in the opposite direction relative to the adjacent layer, and the stranding pitch is designed in a ratio of 5:7:9. After stranding, the wires are approximately cylindrical, and the alternating stranding directions disperse the local tensile and compressive stress during bending, improving flexibility and fatigue life. The galvanized layer enhances corrosion resistance. After the multi-strand copper wires are stranded on the stranding machine, they are arranged coaxially and concentrically with the core material 11 and then extruded onto the outer layer of the core material 11.

[0031] In this embodiment, the core material 11 is disposed at the center of the cable, distributed along the longitudinal direction of the cable, and has a circular cross-section. The core material 11 is made of aramid fiber, which can withstand the axial tensile force of the cable and make the conductor 1 more evenly stressed when bent; it is formed in one step with the conductor 1 through an extrusion process, physically adhering to it without adhesives or welding fixation.

[0032] A sheath layer 2, made of TPU, is formed on the surface of conductor 1. A disulfide polymer is dispersed within the sheath layer 2. The sheath layer 2 is formed on the surface of conductor 1 using a twin-screw extruder with co-directional blending extrusion. In this embodiment, the TPU particles and disulfide polymer are mixed uniformly in the barrel according to a temperature gradient and then extruded through a die. After cooling and setting, the sheath layer 2 adheres tightly to the surface of conductor 1 without any gas gaps.

[0033] The sheath layer 2 has a uniform annular cross-section, with an inner diameter slightly larger than the outer diameter of conductor 1, ensuring mechanical adhesion to the surface of conductor 1. When a microcrack or scratch less than or equal to 5 mm wide appears in the sheath layer 2, the disulfide bonds can exchange and recombine upon contact with moisture, connecting the polymer chains on both sides of the gap, thus closing the crack or scratch. The cable can then be restored to IP67 waterproof rating, requiring no manual maintenance.

[0034] Referring to the table below, the healing time of sheath layer 2 is shown in the figure.

[0035] Crack width Healing time (h) Water pressure tolerance (kPa) 2mm 12 20 5mm 24 10

[0036] A surface layer 3 is provided on the outside of the sheath layer 2. The surface layer 3 is made of polyurethane. The surface layer 3 is in close contact with the sheath layer and the overall cross-section is circular to ensure that the cable remains circular.

[0037] In this embodiment, the surface layer 3 is disposed after the sheath layer 2. It is wrapped around the surface of the surface layer 3 using an annular mold, and the surface layer 3 is pressed to form at least two grooves. These grooves are arranged along the circumference or axial direction of the cable and can form shapes such as numbers, barcodes, or symbols. The spacing between the grooves is short, allowing them to be manually cut using a knife or a sharp object.

[0038] In this embodiment, the grooves of the surface layer 3 have a smooth appearance before being scratched, which does not affect the overall protection; after being scratched, the grooves are arranged to form certain structural features, and the operator can directly observe the pattern formed by scratching the grooves of the surface layer 3.

[0039] In this embodiment, the bending radius is 18mm, which reduces installation space by 40% compared to traditional multi-layer armored cables. The sheath layer 2 is self-healing, resisting mechanical wear and damage during long-term use and reducing maintenance costs. The surface layer 3 has at least one groove, the spacing between which allows for continuous perforation, ensuring the pattern is preserved long-term. Maintenance personnel do not need to attach labels or worry about obscuring the sheath's condition.

[0040] The table below shows a schematic diagram of the bending life of this utility model.

[0041] Bending radius Number of cycles (until breakage) Comparison of traditional cables 18mm (3 × outer diameter) 150,000 80,000

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flexible, self-marking, waterproof cable, comprising a conductor and a sheath layer, wherein the sheath is disposed on the outer side of the conductor, characterized in that: The conductor includes a core material and wires. The core material is disposed at the center of the conductor, and multiple asymmetrically twisted wires are disposed on the outer side of the core material. The wires are twisted in three layers from the inside to the outside. The sheath layer is made of TPU; a surface layer is also provided on the outside of the sheath layer, the surface layer is made of polyurethane, and at least two grooves are arranged on the outside of the surface layer, the grooves can be manually cut to connect them.

2. The flexible self-marking waterproof cable according to claim 1, characterized in that: The conductor comprises galvanized copper wire.

3. A flexible self-marking waterproof cable according to claim 1, characterized in that: The stranding direction of the conductors in each layer alternates, and the pitch ratio of the conductors from the inner layer to the outer layer is 5:7:

9.

4. A flexible self-marking waterproof cable according to claim 1, characterized in that: The sheath layer is formed on the outside of the conductor by twin-screw extrusion molding.

5. A flexible self-marking waterproof cable according to claim 1, characterized in that: The core material includes aramid fibers.

6. A flexible self-marking waterproof cable according to claim 1, characterized in that: The grooves are formed by machining with a mold, and the grooves can be arranged to form a certain shape.

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