Bending-torsion-resistant high-flexibility drag chain cable

Abstract

The utility model relates to the field of cables, and provides a bending-torsion-resistant high-flexibility drag chain cable. The utility model aims to solve the problems of short service life and poor safety caused by conductor breakage, insulating layer abrasion and sheath layering of the traditional drag chain cable under the working conditions of frequent bending and torsion, and adopts the main scheme that the drag chain cable comprises a superfine stranded conductor (1) which is formed by multiple copper wires with the wire diameter range of 0.08-0.15 mm in a compound stranding manner; the thermoplastic rubber insulating layer (2) is coated outside the superfine twisted conductor (1); the colloid filling layer (3) is filled among the plurality of insulated conductors; and the integral thermoplastic rubber outer sheath (4) is coated outside the colloid filling layer (3), the thickness of the integral thermoplastic rubber outer sheath (4) is 1.2-2.0 mm, and no layered interface exists between the outer sheath (4) and the insulating layer (2).

Description

TECHNICAL FIELD

[0001] The utility model relates to cable field provides a kind of bending torsion high flexibility drag chain cable. BACKGROUND

[0002] With the rapid development of industrial automation technology, as the key transmission components in mobile scenarios such as drag chain system, logistics conveying equipment, robot arm, the bending torsion resistance and reliability of the drag chain cable directly determine the stability and service life of the equipment. Traditional drag chain cables are widely used in woodworking machinery, machine tool processing, hoisting machinery and other harsh working conditions of high-frequency bending, torsion and stretching, and need to withstand mechanical stress, oil stains, temperature and humidity changes and other complex environmental challenges for a long time.

[0003] However, the drag chain cable in the prior art still has significant defects:

[0004] 1. Conductor structure limitation: traditional cables mostly use single conductor or twisted thick diameter hard conductor, which meets the basic conductive requirements, but is prone to breakage under high-frequency bending or low-temperature environment due to stress concentration. Especially the conventional 6 type conductor has poor flexibility due to its large wire diameter, which leads to fatigue damage of the cable in narrow space or dynamic laying scene.

[0005] 2. Insulation and filling material mismatch: the existing insulation layer mostly uses ordinary elastic material, which has limited deformation recovery ability and crack propagation resistance, and long-term bending can cause micro-cracks in the insulation layer, leading to insulation performance degradation and even short circuit risk. In addition, the interlayer gap in the cable is not effectively filled, and relative displacement between the conductor and the insulation layer is easily generated during bending, which aggravates the structural looseness and internal wear.

[0006] 3. Sheath design defects: the traditional layered sheath is prone to interface peeling due to the difference in hardness of each layer under dynamic working conditions, and the friction and wear between the sheath and the insulation layer accelerate the material aging. At the same time, the conventional sheath material has poor wear resistance and environmental medium resistance (such as oil stains, acid and alkali), which is prone to hardening and cracking, leading to exposure of the internal structure and seriously affecting the service life of the cable.

[0007] To solve the above problems, the industry has tried to improve by optimizing the conductor lay distance and using elastomer sheath material, but has not been able to systematically solve the structural stability and durability problems of the cable under extreme mechanical stress. Therefore, there is an urgent need for a drag chain cable with high flexibility, dynamic fatigue resistance and long service life to meet the urgent demand for high reliability power transmission of industrial automation equipment.

[0008] This patent technology focuses on the collaborative optimization of material innovation and structure design, through the integration of ultra-fine twisted conductor, dynamic buffer filling and overall flexible sheath, breaking through the performance bottleneck of traditional cables under dynamic working conditions, and providing a better solution for the field of industrial automation. Utility model content

[0009] The utility model discloses to solve the short life, poor safety problem that traditional towline cable is led to in the frequent bending and torsion working condition because of conductor fracture, insulating layer wear and tear and sheath delamination, through the structure synergic design of superfine stranding conductor, gum buffer filling and integral sheath, the dynamic fatigue performance and durability of cable are improved significantly.

[0010] In order to realize the above-mentioned purpose, the utility model adopts the following technical means:

[0011] The utility model provides a kind of bending and torsion resistant high flexibility towline cable, including following structure is arranged gradually from inside to outside:

[0012] Superfine stranding conductor, by the copper wire of multiple line diameter range 0.08mm to 0.15mm is re-stranded to constitute;

[0013] Thermoplastic rubber insulating layer covered in the superfine stranding conductor outside;

[0014] Gum filling layer filled between multiple insulated conductors;

[0015] Integral thermoplastic rubber outer sheath covered in the gum filling layer outside, its thickness is 1.2mm to 2.0mm, and there is no delamination interface between the outer sheath and insulating layer.

[0016] In the above scheme, the stranding pitch ratio of the superfine stranding conductor is 8 to 12 times.

[0017] In the above scheme, the gum filling layer is silica gel or polyurethane glue.

[0018] The bending and torsion resistant high flexibility towline cable described in the patent is improved significantly by structural optimization and material innovation Dynamic working condition adaptability and service life of cable, specifically as follows:

[0019] 1. Superfine stranding conductor 1: adopt the multiple-stranded copper conductor of line diameter 0.08mm to 0.15mm, combined with 8 to 12 times stranding pitch ratio design, significantly reduce bending stress concentration, improve the fatigue resistance of conductor, avoid the brittle fracture problem of traditional thick diameter conductor under the condition of frequent bending and low temperature, make the cable flexibility improve.

[0020] 2. Gum filling layer 3: silica gel or polyurethane glue fills insulating layer gap, absorbs dynamic displacement energy through viscoelastic properties, effectively inhibits the relative sliding of internal conductor and insulating layer, reduces the wear and tear of insulating layer caused by friction, eliminates internal voids, reduces vibration noise and structural deformation risk when cable bending, prolongs the service life of insulation.

[0021] 3. Integral outer sheath 4: a thermoplastic rubber integrally formed sheath (thickness 1.2mm to 2.0mm) without layered interface, which has high wear resistance and anti-fouling, anti-aging performance to resist external mechanical impact and environmental medium erosion, avoids the interface peeling problem of traditional layered sheath, improves the wear resistance of the sheath, and prolongs the overall service life of the cable.

[0022] 4. Synergistic effect: the structure matching design of the conductor, the filling layer and the sheath forms a synergistic mechanism of dynamic stress dispersion-buffering-protection, ensures that the cable still maintains stable electrical performance and mechanical integrity under extreme bending radius and high frequency torsion working conditions, significantly reduces maintenance cost and downtime risk.

[0023] In summary, the patent technology effectively solves the easy damage problem of traditional drag chain cables caused by high material rigidity and loose structure, and provides a high reliability and long life power transmission solution for industrial automation equipment. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the utility model. DETAILED DESCRIPTION

[0025] The embodiments of the utility model will be described in detail below. Although the utility model will be described and illustrated in conjunction with some specific embodiments, it should be noted that the utility model is not limited to these embodiments only. On the contrary, modifications or equivalent replacements made to the utility model should be covered in the scope of claims of the utility model.

[0026] In addition, in order to better illustrate the utility model, a large number of specific details are given in the specific embodiments below. Those skilled in the art will understand that the utility model can also be implemented without these specific details. EMBODIMENT

[0027] As shown in the figure, the bending and torsion resistant high flexibility drag chain cable of the embodiment comprises the following structures from inside to outside: Figure 1

[0028] Superfine stranded conductor:

[0029] The conductor is made of multiple strands of superfine oxygen-free copper wire, with a single copper wire diameter of 0.10mm and a stranding pitch ratio of 10 times, and the stranding direction is right. Compared with the traditional 6 type conductor (wire diameter ≥0.20mm), the conductor has a thinner wire diameter and higher stranding density, which significantly improves the flexibility and bending fatigue resistance of the conductor.

[0030] Thermoplastic rubber insulation layer 2:

[0031] ​A thermoplastic elastomer (TPE) insulation layer with a thickness of 0.5mm is extruded and wrapped outside the ultra-fine stranded conductor 1. This material has both high elasticity and oil stain resistance, and the smooth surface of the insulation layer closely adheres to the conductor, avoiding cracking of the insulation layer due to friction during bending.

[0032] The gel filling layer 3:

[0033] Silicone filler is injected into the gap between the multiple insulated conductors, with a filling rate of more than 95%, ensuring that there are no gaps inside the cable. After curing, the filler forms an elastic gel layer that can buffer the dynamic displacement between the conductors and inhibit the relative sliding of the insulation layer and the sheath, reducing the risk of internal wear and tear.

[0034] The integral thermoplastic elastomer outer sheath 4:

[0035] A thermoplastic elastomer (TPR) outer sheath with a thickness of 1.5mm is extrusion molded outside the gel filling layer 3. The sheath is designed as a whole, with no layered interface, and has both wear resistance and anti-bending deformation ability. The uniform and smooth surface of the sheath directly adheres to the insulation layer 2, avoiding the interface peeling problem caused by the hardness difference of traditional layered sheaths. Example

[0036] On the basis of Example 1, the following parameters are further optimized:

[0037] The single wire diameter of the ultra-fine stranded conductor 1 is adjusted to 0.08mm, and the stranded pitch ratio is increased to 12 times, further improving the torsion resistance of the conductor;

[0038] The gel filling layer 3 is replaced with polyurethane glue, which has a higher viscoelastic modulus and is suitable for high-frequency vibration environments;

[0039] The thickness of the outer sheath 4 is increased to 2.0mm.

Claims

1. A bend-torsion resistant, high-flexibility, chain cable, characterized in that, It comprises the following structures arranged from inside to outside in sequence: a super-fine stranded conductor (1) composed of a plurality of copper wires with a wire diameter ranging from 0.08 mm to 0.15 mm; a thermoplastic rubber insulation layer (2) covering the super-fine stranded conductor (1); a gel filling layer (3) filled between the plurality of insulated conductors; a whole thermoplastic rubber outer sheath (4) covering the gel filling layer (3), with a thickness of 1.2 mm to 2.0 mm, and without a layered interface between the outer sheath (4) and the insulation layer (2).

2. The bend-torsion resistant, high-flexibility, chain cable of claim 1, wherein, The stranding pitch ratio of the super-fine stranded conductor (1) is 8 to 12 times.

3. The bend-torsion resistant, high-flexibility, chain cable of claim 1, wherein, The gel filling layer (3) is silicone or polyurethane glue.

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