A wear-resistant, torsion-resistant, high-strength trailing cable

Abstract

The utility model relates to cable technical field especially relates to a wear -resisting, anti -twist type, high -strength drag cable, including the outer sheath, the inside of outer sheath is provided with the protective braid, the inside of protective braid is provided with the inner protective layer, the inside of inner protective layer is provided with the shield layer, the inside of shield layer is provided with the cable, the cable is composed of a plurality of conductors and the insulating layer of setting in the conductor periphery, the utility model discloses the drag cable is suitable for the rated voltage 3kV and below wind power, headstock, rock drilling jumbo, caterpillar type hoist, conveyer and unloading coal storage device two sets of dumper system drag order mobile shielded flexible cable, generally used in mobile installation, connect low -voltage distribution board and power converter and other equipment.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a wear-resistant, torsion-resistant, high-strength drag cable. Background Technology

[0002] Currently, most tow cables on the market are simple in structure and have average performance. However, in automated equipment, tow cables are used to protect various sensors, actuators, and controllers, ensuring the normal operation of the equipment. Automated equipment often needs to move and change positions frequently, but in actual use, cable tangling, knotting, and damage frequently occur. Therefore, improving the stability and reliability of cable operation is particularly important. In view of this, there is a need to develop a tow cable that can freely twist and bend with moving equipment such as tippers, pushers, and transfer platforms when freely suspended, while also possessing high tensile strength, flame retardancy, oil resistance, water resistance, UV resistance, tear resistance, abrasion resistance, and high reliability. Utility Model Content

[0003] This utility model discloses a wear-resistant, torsion-resistant, and high-strength drag cable, which aims to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A wear-resistant, torsion-resistant, high-strength drag cable includes an outer sheath 6, characterized in that: a protective braided layer 5 is provided inside the outer sheath 6, an inner sheath 4 is provided inside the protective braided layer 5, a shielding layer 3 is provided inside the inner sheath 4, and a cable is provided inside the shielding layer 3. The cable is composed of several conductors 1 and an insulation layer 2 disposed around the conductors 1.

[0006] The cable adopts a flexible circular structure, and high-strength aramid fibers are added as reinforcing elements 7 when the conductor 1 is stranded.

[0007] The cable can have a flat structure, and the addition of high-strength aramid fibers to conductor 1 enhances the conductor's strength.

[0008] Conductor 1 is a copper conductor, using the heat-contained constant-temperature tin-plated Class 6 soft conductor as per international standard IEC 60028. It is suitable for use in cables subjected to frequent movement, bending, and twisting under normal operating conditions. The conductor stranding is done in the same direction, with a stranding pitch range of 6 to 8 times, achieving optimal performance in torsion resistance, bending resistance, and tensile strength. High-strength aramid fibers are added as reinforcing elements during conductor stranding. Aramid fibers possess high toughness, high strength, and low weight, increasing the conductor's tensile strength and flexibility. The tin used is the highest purity No. 1 tin, with a purity exceeding 99.9%, effectively protecting the conductor from oxidation after prolonged use and preventing fatigue during movement. The copper wire elongation must not be less than 30%. The copper conductor uses premium oxygen-free copper rods, the highest grade copper rod material in international copper standards; volume resistivity ≤ 0.01724 (ρ20Ω·mm). 2 / m); Copper purity ≥99.995%.

[0009] The insulation layer 2 uses imported irradiated cross-linked, tear-resistant, high-tensile elastomer insulation material. This raw material requires high-speed and stable extrusion and subsequent electron beam irradiation cross-linking treatment to achieve the high resistance, high tensile strength, and tear resistance exhibited after cross-linking. The operating temperature range is -60℃ to +125℃; its tensile strength, tear resistance, oil resistance, and elongation are more than 50% higher than ordinary marine cables and rubber-sheathed cables; insulation concentricity is no more than 5%; insulation resistance constant Ki ≥ 3670 MΩ·km (at 20℃); tensile strength before aging ≥ 35.0 MPa; and elongation at -60℃ still reaches over 600%. This structure ensures the minimum allowable temperature for cable operation, installation, transportation, and storage: maximum allowable conductor operating temperature: 125℃; maximum allowable conductor short-circuit temperature: 250℃ (maximum 5s).

[0010] The shielding layer 3 is made of tin-plated alloy soft copper wire braided shielding; the braiding density is ≥95%; the braiding wires are soft wires of 0.10~0.15mm, and the braiding wire angle is controlled between 25° and 35°; this facilitates frequent movement, bending, and pulling of the cable, thus achieving optimal shielding and cable armor performance.

[0011] The inner sheath 4 consists of an extruded, wear-resistant, and oil-resistant PUR sheath layer outside the shielded cable core layer, ensuring normal operation of the cable in oily environments. PUR is a material with wear resistance, mechanical strength resistance, and enhanced resistance to various organic solvents and low-temperature properties. It maintains excellent toughness and elasticity even at -35°C, with a bending radius of up to 4 times or even lower, making it suitable for harsh environments. After extrusion, the sheath surface should be smooth and flat, free from sharp corners, pits, scorching, or scratches, and the cross-section should be free of visible defects such as bubbles and pinholes.

[0012] The protective braided layer 5 is made of imported poly(p-phenylene terephthalamide) (PPD), Kevlar, and aramid fiber material, combined with fine steel wire. The material's main characteristics include ultra-high strength, ultra-high modulus, high temperature resistance, high impact resistance, corrosion resistance, and high tensile strength. The braiding wire angle is controlled between 25° and 35°; the braiding density is not less than 95%; this facilitates use under particularly harsh conditions such as frequent pulling or collisions of the cable. The maximum allowable tensile load of the cable is guaranteed to be 15 N / mm². 2 (Consider the entire copper cross section).

[0013] The outer sheath 6 is made of imported 125℃ irradiated cross-linked high tear-resistant and high flame-retardant sheath material, which has excellent tensile strength, flame retardancy, oil resistance, water resistance, UV resistance, tear resistance, wear resistance, salt spray resistance, and ozone resistance. Its suitable operating environment temperature can reach -60℃ to +125℃. Its tensile strength and elongation change rate are more than 30% higher than those of ordinary ship cables and rubber-sheathed cables. The bundled flame retardant performance meets the international standard IEC60332-3-22CAT A level, which is the highest level of bundled flame retardant for cables. Combined with the actual field use, it is convenient to install the cables in bundles. The cable outer diameter eccentricity is required to be ≤5%, the minimum bending radius of the cable is 4 times the cable outer diameter, and the torsional stress of the cable when it is freely suspended is ±120° / m.

[0014] The above-mentioned tow cable adopts a special flexible round structure design, and can also be used in a flat structure. It is suitable for signal transmission and electrical connection in situations requiring frequent bending and reciprocating motion, such as cable tow trolleys, gantry cranes, mobile cranes, benchtop conveyors, high-speed conveying systems, high-speed extraction equipment, and machine tools. It can withstand moderate stress and can be used in dry or humid indoor and outdoor environments. The structural design of adding high-strength aramid fibers to the conductor enhances the conductor strength without significantly affecting the conductor weight. The inner sheath of the cable reduces the mechanical stress on the core wires, fixes the core wire position, makes the cable round and compact, and extends its service life. At the same time, it provides a more robust inner lining for the shielding layer of the tow cable. Tinned copper wire braided shielding ensures accurate data transmission and protects the cable from electromagnetic interference, making it suitable for applications with high electromagnetic interference resistance requirements. A reinforcing layer is made of a mixture of Kevlar aramid fiber and fine steel wire, enhancing the cable's compressive and tensile strength as well as its abrasion resistance. Polyurethane (PUR) possesses excellent oil resistance, abrasion resistance, antimicrobial properties, hydrolysis resistance, chemical corrosion resistance, and UV resistance, making this cable suitable for extremely harsh industrial environments.

[0015] The beneficial effects of this invention are as follows: This utility model provides a halogen-free, wear-resistant, torsion-resistant, high-strength towing cable, suitable for use in wind power, overhead cranes, rock drilling rigs, crawler cranes, conveyors, and two-set tippler systems for coal unloading and storage devices with rated voltages of 3kV and below. It is generally used for mobile installations, connecting low-voltage distribution boards and power converters, etc. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0018] In the diagram: 1. Conductor; 2. Insulation layer; 3. Shielding layer; 4. Inner sheath; 5. Protective braided layer; 6. Outer sheath; 7. Reinforcing element. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] A wear-resistant, torsion-resistant, high-strength drag cable, such as Figure 1 As shown, it includes an outer sheath 6, characterized in that: a protective braided layer 5 is provided inside the outer sheath 6, an inner sheath 4 is provided inside the protective braided layer 5, a shielding layer 3 is provided inside the inner sheath 4, and a cable is provided inside the shielding layer 3. The cable is composed of several conductors 1 and an insulating layer 2 disposed around the conductors 1.

[0021] The cable adopts a flexible circular structure, and high-strength aramid fibers are added as reinforcing elements 7 when the conductor 1 is stranded.

[0022] The cable can have a flat structure, and the addition of high-strength aramid fibers to conductor 1 enhances the conductor's strength.

[0023] Conductor 1 is a copper conductor, using the heat-contained constant-temperature tin-plated Class 6 soft conductor as per international standard IEC 60028. It is suitable for use in cables subjected to frequent movement, bending, and twisting under normal operating conditions. The conductor stranding is done in the same direction, with a stranding pitch range of 6 to 8 times, achieving optimal performance in torsion resistance, bending resistance, and tensile strength. High-strength aramid fibers are added as reinforcing elements during conductor stranding. Aramid fibers possess high toughness, high strength, and low weight, increasing the conductor's tensile strength and flexibility. The tin used is the highest purity No. 1 tin, with a purity exceeding 99.9%, effectively protecting the conductor from oxidation after prolonged use and preventing fatigue during movement. The copper wire elongation must not be less than 30%. The copper conductor uses premium oxygen-free copper rods, the highest grade copper rod material in international copper standards; volume resistivity ≤ 0.01724 (ρ20Ω·mm). 2 / m); Copper purity ≥99.995%.

[0024] The insulation layer 2 uses imported irradiated cross-linked, tear-resistant, high-tensile elastomer insulation material. This raw material requires high-speed and stable extrusion and subsequent electron beam irradiation cross-linking treatment to achieve the high resistance, high tensile strength, and tear resistance exhibited after cross-linking. The operating temperature range is -60℃ to +125℃; its tensile strength, tear resistance, oil resistance, and elongation are more than 50% higher than ordinary marine cables and rubber-sheathed cables; insulation concentricity is no more than 5%; insulation resistance constant Ki ≥ 3670 MΩ·km (at 20℃); tensile strength before aging ≥ 35.0 MPa; and elongation at -60℃ still reaches over 600%. This structure ensures the minimum allowable temperature for cable operation, installation, transportation, and storage: maximum allowable conductor operating temperature: 125℃; maximum allowable conductor short-circuit temperature: 250℃ (maximum 5s).

[0025] The shielding layer 3 is made of tin-plated alloy soft copper wire braided shielding; the braiding density is ≥95%; the braiding wires are soft wires of 0.10~0.15mm, and the braiding wire angle is controlled between 25° and 35°; this facilitates frequent movement, bending, and pulling of the cable, thus achieving optimal shielding and cable armor performance.

[0026] The inner sheath 4 consists of an extruded, wear-resistant, and oil-resistant PUR sheath layer outside the shielded cable core layer, ensuring normal operation of the cable in oily environments. PUR is a material with wear resistance, mechanical strength resistance, and enhanced resistance to various organic solvents and low-temperature properties. It maintains excellent toughness and elasticity even at -35°C, with a bending radius of up to 4 times or even lower, making it suitable for harsh environments. After extrusion, the sheath surface should be smooth and flat, free from sharp corners, pits, scorching, or scratches, and the cross-section should be free of visible defects such as bubbles and pinholes.

[0027] The protective braided layer 5 is made of imported poly(p-phenylene terephthalamide) (PPD), Kevlar, and aramid fiber material, combined with fine steel wire. The material's main characteristics include ultra-high strength, ultra-high modulus, high temperature resistance, high impact resistance, corrosion resistance, and high tensile strength. The braiding wire angle is controlled between 25° and 35°; the braiding density is not less than 95%; this facilitates use under particularly harsh conditions such as frequent pulling or collisions of the cable. The maximum allowable tensile load of the cable is guaranteed to be 15 N / mm². 2 (Consider the entire copper cross section).

[0028] The outer sheath 6 is made of imported 125℃ irradiated cross-linked high tear-resistant and high flame-retardant sheath material, which has excellent tensile strength, flame retardancy, oil resistance, water resistance, UV resistance, tear resistance, wear resistance, salt spray resistance, and ozone resistance. Its suitable operating environment temperature can reach -60℃ to +125℃. Its tensile strength and elongation change rate are more than 30% higher than those of ordinary ship cables and rubber-sheathed cables. The bundled flame retardant performance meets the international standard IEC60332-3-22CAT A level, which is the highest level of bundled flame retardant for cables. Combined with the actual field use, it is convenient to install the cables in bundles. The cable outer diameter eccentricity is required to be ≤5%, the minimum bending radius of the cable is 4 times the cable outer diameter, and the torsional stress of the cable when it is freely suspended is ±120° / m.

[0029] like Figure 2 As shown, tow cables can also be used in flat structures, suitable for signal transmission and electrical connections in applications requiring frequent bending and reciprocating motion, such as cable tow trolleys, gantry cranes, mobile cranes, gantry conveyors, high-speed conveying systems, high-speed extraction equipment, and machine tools. They can withstand moderate stress and can be used in dry or humid indoor and outdoor environments. The structural design incorporating high-strength aramid fibers into the conductor enhances conductor strength without significantly affecting conductor weight. The inner sheath reduces mechanical stress on the core wires, fixes their position, makes the cable round and compact, extends its lifespan, and provides a more robust inner lining for the tow cable's shielding layer. Tinned copper wire braided shielding ensures accurate data transmission and protects the cable from electromagnetic interference, making it suitable for applications with high electromagnetic interference resistance requirements. A reinforcing layer is made of a mixture of Kevlar aramid fiber and fine steel wire, enhancing the cable's compressive and tensile strength as well as its abrasion resistance. Polyurethane (PUR) possesses excellent oil resistance, abrasion resistance, antimicrobial properties, hydrolysis resistance, chemical corrosion resistance, and UV resistance, making this cable suitable for extremely harsh industrial environments.

[0030] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A wear-resistant, torsion-resistant, high-strength drag cable, comprising an outer sheath (6), characterized in that: The outer sheath (6) has a protective braided layer (5) inside, the protective braided layer (5) has an inner sheath (4) inside, the inner sheath (4) has a shielding layer (3) inside, the shielding layer (3) has a cable inside, and the cable is composed of several conductors (1) and an insulating layer (2) disposed around the conductors (1); The cable adopts a flexible circular structure or a flat structure; When the conductor (1) is stranded, high-strength aramid fibers are added as reinforcing elements (7).

2. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The conductor (1) is a copper conductor and adopts the Class 6 soft conductor of heat-conducting constant temperature tin plating in the international standard IEC60028.

3. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The insulation layer (2) is made of 125℃ irradiated cross-linked tear-resistant high tensile elastomer insulation material.

4. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The shielding layer (3) adopts a tin-plated alloy soft copper wire braided structure.

5. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The inner sheath (4) is a wear-resistant and oil-resistant PUR sheath extruded outside the shielded cable core layer.

6. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The protective braided layer (5) is made of a mixture of poly(p-phenylene terephthalamide) (PPD), Kevlar aramid fiber material, and fine steel wire.

7. The wear-resistant, torsion-resistant, high-strength drag cable according to claim 1, characterized in that: The outer sheath (6) is made of 125℃ irradiated cross-linked high tear-resistant and high flame-retardant sheath material.

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