Flexing-resistant flexible cable

Abstract

The utility model discloses a flexure-resistant flexible cable, which is composed of a plurality of layers of cable cores, an insulating layer, a shielding layer and a sheath, the plurality of layers of cable cores are formed by intertwisting an inner layer conductor, a middle layer conductor and an outer layer conductor in different directions, and the bending stress is dispersed by intertwisting in different directions, so that the bending service life of the cable cores is prolonged, and the problems in the prior art can be solved. The utility model relates to a deflection-resistant flexible cable, which comprises a plurality of layers of cable cores, an insulating layer, a shielding layer and a sheath which are sequentially arranged from inside to outside, the multi-layer cable core is formed by twisting an inner-layer conductor, a middle-layer conductor and an outer-layer conductor in different directions in a layered manner, the inner-layer conductor is formed by spirally twisting a plurality of inner conductors in the right direction, the middle-layer conductor is formed by spirally twisting a plurality of middle conductors in the left direction, and the outer-layer conductor is formed by winding a copper-clad aluminum wire in a sine wave manner; the insulating layer is made of rubber; the shielding layer is a tinned copper wire braided layer, and the coverage rate is not less than 85%.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable field especially relates to a flexible cable. BACKGROUND

[0002] Cable is used to transmit electric (magnetic) energy, information and realizes electromagnetic energy conversion wire product.

[0003] In the high frequency bending scene such as robot joint, port crane, automation equipment, the requirement of cable's resistance to flexing is relatively high, and the existing cable cannot satisfy the demand of the existing high frequency bending scene due to the following defects: conductor fatigue fracture: the traditional flexible cable adopts single stranded conductor, and the broken strand appears after high frequency bending (more than 100,000 times), which leads to resistance sudden increase (amplitude more than 30%).

[0004] Therefore, aiming at the above situation, how to improve the existing cable to solve the above-mentioned shortcomings becomes an important technical problem to be solved by the person skilled in the art. INVENTION CONTENTS

[0005] The utility model discloses a flexible cable of resistance to flexing is composed of multilayer cable core, insulating layer, shielding layer and sheath, and the multilayer cable core is formed by the layering heterostranded of inner layer conductor, middle layer conductor and outer layer conductor, and the heterostranded dispersion bending stress improves the bending life of cable core, and can solve the problems of prior art.

[0006] The flexible cable of resistance to flexing provided by the utility model includes multilayer cable core, insulating layer, shielding layer and sheath arranged in turn from inside to outside.

[0007] The multilayer cable core is formed by the layering heterostranded of inner layer conductor, middle layer conductor and outer layer conductor, wherein the inner layer conductor is formed by the right helical stranding of a plurality of inner conductors, the middle layer conductor is formed by the left helical stranding of a plurality of middle conductors, and the outer layer conductor is formed by the sine wave mode winding of copper-clad aluminum wire.

[0008] The insulating layer is made of rubber.

[0009] The shielding layer is a tinned copper wire braid layer, and the coverage rate is not less than 85%.

[0010] Preferably,

[0011] The inner layer conductor is formed by the right helical stranding of 19 strands of silver-plated copper alloy filaments.

[0012] Preferably,

[0013] The middle layer conductor is formed by the left helical stranding of 7 groups of tinned copper wire bundles, and each group of tinned copper wire bundle is composed of 7 tinned copper wires.

[0014] Preferably,

[0015] The insulation layer is made of ternary ethylene-propylene rubber or silicone rubber.

[0016] Preferably,

[0017] The thickness of the insulation layer is 0.8-1.2mm.

[0018] Preferably,

[0019] The sheath is butyronitrile-polyurethane composite elastomer, and is provided with corrugated grooves on the surface.

[0020] Preferably,

[0021] The sheath contains dynamic disulfide bond polymer and microencapsulated silane repair agent, and is provided with a biomimetic fish scale structure on the surface, and the biomimetic fish scale structure satisfies a minimum bending radius ≤ 3D, wherein D is the outer diameter of the cable.

[0022] Preferably,

[0023] The shielding layer is externally covered with a polyester tape wrapping isolation layer.

[0024] Preferably,

[0025] The inner layer conductor is coated with a graphene lubricating layer;

[0026] The middle layer conductor is filled with ceramic microbeads.

[0027] The utility model discloses a flexible cable of bending resistance, which comprises a plurality of cable cores, an insulation layer, a shielding layer and a sheath arranged from inside to outside; the plurality of cable cores are formed by layering and twisting the inner layer conductor, the middle layer conductor and the outer layer conductor in different directions, wherein the inner layer conductor is formed by twisting a plurality of inner conductors in a right-handed spiral manner, the middle layer conductor is formed by twisting a plurality of middle conductors in a left-handed spiral manner, and the outer layer conductor is formed by winding a copper-clad aluminum wire in a sinusoidal manner; the insulation layer is made of rubber; the shielding layer is a braided layer of tin-plated copper wires, and the coverage rate is not less than 85%. The flexible cable of bending resistance is composed of the plurality of cable cores, the insulation layer, the shielding layer and the sheath, the plurality of cable cores are formed by layering and twisting the inner layer conductor, the middle layer conductor and the outer layer conductor in different directions, so that the flexible cable of bending resistance can utilize the characteristic of dispersing bending stress by twisting in different directions to improve the bending life of the cable core, thereby solving the problems existing in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating laboriously.

[0029] Figure 1 It is the structure schematic view of the embodiment of the flexible cable of the utility model.

[0030] Figure 2 It is the structure schematic view of the embodiment of the flexible cable of the utility model containing corrugated groove 41 and polyester tape wrapping isolation layer 5. DETAILED DESCRIPTION

[0031] The utility model discloses a kind of flexible cables of bending resistance, which is composed of multilayer cable core, insulating layer, shielding layer and sheath, the multilayer cable core in which is made of inner layer conductor, middle layer conductor and outer layer conductor layered heterotropic stranding, heterotropic stranding disperses bending stress, to improve the bending life of cable core, the problems existing in prior art can be solved.

[0032] The technical solutions in the embodiments of the utility model will be described clearly and detailedly in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. Please refer to Figure 1 And 2 The flexible cable of bending resistance provided by the embodiments of the utility model includes multilayer cable core 1, insulating layer 2, shielding layer 3 and sheath 4 arranged in sequence from inside to outside;

[0033] The multilayer cable core 1 is made of inner layer conductor 11, middle layer conductor 12 and outer layer conductor 13 layered heterotropic stranding, wherein the inner layer conductor 11 is made of multiple inner conductors spirally twisted in right direction, the middle layer conductor 12 is made of multiple middle conductors spirally twisted in left direction, and the outer layer conductor 13 is made of copper-clad aluminum wire wound in sinusoidal wave mode;

[0034] The insulating layer 2 is made of rubber;

[0035] The shielding layer 3 is a tinned copper wire braid layer, and the coverage rate is not less than 85%.

[0036] In the utility model, first of all, it needs to be explained that the cable core of traditional same direction stranding is caused local fatigue due to stress superposition generated in single direction, the cable core of the utility model adopts layered heterotropic stranding mode, that is, the inner layer conductor 11 is made of multiple inner conductors spirally twisted in right direction, the middle layer conductor 12 is made of multiple middle conductors spirally twisted in left direction, and the outer layer conductor 13 is made of copper-clad aluminum wire wound in sinusoidal wave mode, the multilayer cable core 1 manufactured by this mode makes the complementary tensile and compression deformation of each layer strand when bending in different stranding directions, avoids single direction stress superposition, thereby reducing the risk of local fatigue, that is, the technical problems existing in prior art can be solved.

[0037] Preferably,

[0038] The inner conductor 11 is formed by 19 strands of silver-plated copper alloy filaments twisted in a right-hand spiral.

[0039] In the utility model, the diameter of the silver-plated copper alloy filament can be selected as 0.08-0.12mm, preferably 0.1mm, and the spiral twisting is performed according to a pitch ratio of 1:12.

[0040] Preferably,

[0041] The middle conductor 12 is formed by 7 groups of tinned copper wire bundles twisted in a left-hand spiral, wherein each group of tinned copper wire bundle is composed of 7 tinned copper wires.

[0042] It should be noted that the diameter of the tinned copper wire can be selected as 0.18-0.22mm, preferably 0.2mm, and the spiral twisting is performed according to a pitch ratio of 1:8.

[0043] Preferably,

[0044] The insulating layer 2 is made of ethylene propylene terpolymer or silicone rubber.

[0045] It should be noted that the temperature resistance range of the ethylene propylene terpolymer or silicone rubber is relatively wide, and the anti-aging performance is good, so that the cracking of the insulating layer caused by bending can be reduced.

[0046] Preferably,

[0047] The thickness of the insulating layer 2 is 0.8-1.2mm.

[0048] Preferably,

[0049] The sheath 4 is a butyronitrile-polyurethane composite elastomer, and a corrugated groove 41 is arranged on the surface.

[0050] In the utility model, the sheath 4 can be a butyronitrile-polyurethane composite elastomer, has good elasticity and bending resistance, and the corrugated groove 41 on the surface can further disperse stress.

[0051] Preferably,

[0052] The sheath 4 contains a dynamic disulfide bond polymer and a microencapsulated silane repair agent, and a bionic fish scale structure is arranged on the surface, and the bionic fish scale structure satisfies a minimum bending radius ≤3D, wherein D is the outer diameter of the cable.

[0053] In the utility model, when the sheath 4 contains a dynamic disulfide bond polymer and a microencapsulated silane repair agent, it has a certain repair capacity, and the design of the bionic fish scale structure can expand and release stress through the texture when the cable is bent.

[0054] Preferably,

[0055] The shielding layer 3 is externally covered with a polyester tape wrapping isolation layer 5.

[0056] Preferably,

[0057] The inner layer conductor 11 is coated with a graphene lubricating layer on the surface;

[0058] The middle layer conductor 12 is filled with ceramic microbeads 121.

[0059] The flexible cable of the utility model, comprising from inside to outside successively arranged multilayer cable core 1, insulation layer 2, shielding layer 3 and sheath 4, multilayer cable core 1 is made of inner layer conductor 11, middle layer conductor 12 and outer layer conductor 13 and is made of the layering hetero direction stranding, wherein inner layer conductor 11 is made of the right helical stranding of multiple inner conductors, middle layer conductor 12 is made of the left helical stranding of multiple middle conductors, and outer layer conductor 13 is made of the sine wave mode winding of copper-clad aluminum wire; The insulation layer 2 is made of rubber; The shielding layer 3 is a tinned copper wire braiding layer, and the coverage rate is not less than 85%. Through the multilayer cable core 1, the insulation layer 2, the shielding layer 3 and the sheath 4 of the flexible cable, the multilayer cable core 1 in it is made of the layering hetero direction stranding of inner layer conductor 11, middle layer conductor 12 and outer layer conductor 13, so that the flexible cable of the utility model can utilize the characteristic of the hetero direction stranding dispersion bending stress, improve the bending life of the cable core, thereby solve the problems existing in the prior art.

[0060] The above has carried out the detailed introduction to the flexible cable of the utility model, for the general technical personnel of the field, according to the idea of the embodiment of the utility model, there will be changes in specific implementation mode and application range, and the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A flexible cable resistant to bending, characterized in that, It includes multiple layers of cable core, insulation layer, shielding layer and sheath arranged from the inside out; The multilayer cable core is formed by layering inner conductor, middle conductor and outer conductor in opposite directions. The inner conductor is formed by multiple inner conductors twisted in a right-hand spiral, the middle conductor is formed by multiple middle conductors twisted in a left-hand spiral, and the outer conductor is formed by winding copper-clad aluminum wire in a sine wave pattern. The insulating layer is made of rubber; The shielding layer is a tin-plated copper wire braided layer, and its coverage is not less than 85%.

2. The flexible cable resistant to bending according to claim 1, characterized in that, The inner conductor is made of 19 strands of silver-plated copper alloy wire twisted in a right-hand spiral.

3. The flexible cable resistant to bending according to claim 1, characterized in that, The middle conductor is composed of 7 groups of tinned copper wire bundles twisted in a left-hand spiral, with each group of tinned copper wire bundles consisting of 7 tinned copper wires.

4. The flexible cable resistant to bending according to claim 1, characterized in that, The insulating layer is made of EPDM rubber or silicone rubber.

5. The flexible cable resistant to bending according to claim 4, characterized in that, The thickness of the insulating layer is 0.8-1.2 mm.

6. The flexible cable resistant to bending according to claim 1, characterized in that, The sheath is made of nitrile-polyurethane composite elastomer and has corrugated grooves on its surface.

7. The flexible cable resistant to bending according to claim 1, characterized in that, The sheath contains a dynamic disulfide polymer and a microencapsulated silane repair agent, and its surface is provided with a biomimetic fish scale pattern structure. The biomimetic fish scale pattern structure satisfies the minimum bending radius ≤ 3D, where D is the outer diameter of the cable.

8. The flexible cable resistant to bending according to any one of claims 1 to 7, characterized in that, The shielding layer is covered with a polyester tape wrapping isolation layer.

9. The flexible cable resistant to bending according to claim 8, characterized in that, The inner conductor surface is coated with a graphene lubricating layer; The middle conductor is filled with ceramic microspheres.

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