A flexible cable

Abstract

The utility model discloses a flexible cable belongs to cable technical field, including inner conductor subassembly, insulating layer, buffer layer and outer sheath, the outer sheath is by at least two layers of braided layer and shape combination of outer sheath constitutes, and two layers of braided layer are set up on material, braided angle or braided density difference, and are provided with the segment type structure of periodic change of the direction of weaving on the length direction, in the braided layer, the inner layer weaving is formed by high strength fiber, and the braided angle is 30 45 DEG, and the outer layer weaving is formed by the wire, and the braided angle direction is contrary with the inner layer weaving, the utility model cooperates segment type weaving direction reversal through double -layer different material, reverse braided angle, makes shear path dispersion when bending -twist conversion, and inhibits local stress concentration, the low friction film between metal and fiber weaving forms the slippage interface, and reduces the fretting wear between braided layer, the circumferential gradient density makes the expected stress surface load higher, and the outer sheath whole still keeps pliable.

Description

Technical Field

[0001] This utility model discloses a cable technology, and in particular relates to a flexible cable. Background Technology

[0002] Existing flexible cables often improve flexibility and mechanical strength through methods such as finely stranded conductors, elastic outer sheaths, and metal or fiber braided sheaths. However, under long-term, repeated bending-rotation-tension composite loads, problems such as localized stress concentration and sheath wear / cracking can easily occur. Utility Model Content

[0003] The purpose of this invention is to provide a flexible cable to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flexible cable, comprising an inner conductor assembly, an insulation layer, a buffer layer and an outer sheath, wherein the outer sheath is composed of at least two braided layers and a shaped outer sheath, and the two braided layers are differentiated in terms of material, braiding angle or braiding density, and are provided with a segmented structure with periodically changing braiding direction in the length direction;

[0005] In the braided layers, the inner braid is formed by high-strength fibers with a braiding angle of 30-45°, while the outer braid is formed by metal wires with a braiding angle opposite to that of the inner braid.

[0006] Preferably, the inner and outer braids have a gradient density distribution in the circumferential direction, and the density on the inner side and the expected stress surface is greater than the density at other locations.

[0007] Preferably, the weaving angle of the outer sheath is changed at regular intervals along its length.

[0008] Preferably, a low-friction film is provided between the inner and outer braids.

[0009] Preferably, the outer sheath is fitted with an axial reinforcement, and the reinforcement is made of aramid fiber bundles, with a cross-sectional area accounting for 8%.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention utilizes a combination of double-layered dissimilar materials, reverse weaving angles, and segmented weaving direction reversal to disperse the shear path during bending-torsion transitions and suppress local stress concentration. The low-friction film between the metal and fiber weave forms a slippery interface, reducing fretting wear between weave layers. The circumferential gradient density allows for higher load-bearing capacity on the expected stress surface, while the outer sheath remains flexible overall. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a flexible cable.

[0013] Reference numerals: 1. Inner conductor assembly; 2. Insulation layer; 3. Buffer layer; 4. Outer sheath; 5. Inner braid; 6. Outer braid; 7. Axial reinforcement. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0015] A flexible cable, such as Figure 1 As shown, it includes an inner conductor assembly 1, an insulating layer 2, a buffer layer 3, and an outer sheath 4. The outer sheath 4 is composed of at least two braided layers combined with a shaped outer sheath. The two braided layers are differentiated in terms of material, braiding angle, or braiding density, and have a segmented structure with periodically changing braiding direction in the length direction.

[0016] In the braided layer, the inner braid 5 is formed of high-strength fibers with a braiding angle of 30-45°, and the outer braid 6 is formed of metal wires with a braiding angle opposite to that of the inner braid 5. The opposite braiding directions can improve the torsional balance between the inner braid 5 and the outer braid 6.

[0017] The inner braid 5 and the outer braid 6 have a gradient density distribution in the circumferential direction, and the density on the inner side and the expected stress surface is greater than the density at other locations, absorbing circumferential compression and micro-motion of the conductor assembly;

[0018] The outer sheath 4 changes the weaving angle at regular intervals along its length, and adjusts the weaving pitch and tension in the circumferential zone to achieve a coverage gradient.

[0019] A low-friction film is placed between the inner braid 5 and the outer braid 6, and spiral wrapping is used with an overlap rate of 60%. This layer allows controlled micro-slippage between the braided layers to smooth out peaks and fill valleys.

[0020] The outer sheath is fitted with an axial reinforcement 7, and the reinforcement material is aramid fiber bundles, accounting for 8% of the cross-sectional area.

[0021] Simplified cable assembly and manufacturing process:

[0022] S1: Prepare inner conductor assembly 1 and extrude insulating layer 2;

[0023] S2: A buffer layer 3 is formed outside the insulating layer 2;

[0024] S3: High-strength fibers are woven into the inner layer at a weaving angle of 30°-45°, and gradient density is achieved through circumferential partitioning control;

[0025] S4: Lay a low-friction film between the inner and outer braids;

[0026] S5: The outer metal braid is formed in the opposite braiding angle direction to the inner layer, and the braiding direction is changed periodically according to the set segment length;

[0027] S6: Co-extrusion forms a shaped outer sheath, while embedding an axial reinforcement 7;

[0028] S7: Cooling and shaping, surface treatment and finishing.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flexible cable, characterized in that: It includes an inner conductor assembly (1), an insulating layer (2), a buffer layer (3) and an outer sheath (4). The outer sheath (4) is composed of at least two braided layers and a shaped outer sheath. The two braided layers are differentiated in terms of material, braiding angle or braiding density, and have a segmented structure with periodically changing braiding direction in the length direction. In the braided layer, the inner braid (5) is formed of high-strength fibers with a braiding angle of 30-45°, and the outer braid (6) is formed of metal wires with a braiding angle opposite to that of the inner braid (5).

2. The flexible cable according to claim 1, characterized in that: The inner layer weave (5) and the outer layer weave (6) have a gradient density distribution in the circumferential direction, and the density on the inner side and the expected stress surface is greater than the density at other locations.

3. A flexible cable according to claim 2, characterized in that: The outer protective layer (4) has its weaving angle changed at regular intervals along its length.

4. A flexible cable according to claim 3, characterized in that: A low-friction film is provided between the inner braid (5) and the outer braid (6).

5. A flexible cable according to claim 4, characterized in that: The outer sheath is fitted with an axial reinforcement (7), and the reinforcement material is aramid bundle, with a cross-sectional area ratio of 8%.

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