Halogen-free low-smoke flame-retardant aluminum alloy power cable for coal mine

Abstract

The utility model discloses a coal mine halogen-free low-smoke flame-retardant aluminum alloy power cable, which comprises a cable core, the cable core comprises a plurality of conductors, each conductor comprises a special-shaped core body, an insulating layer arranged outside the special-shaped core body, and a water-blocking tape layer arranged outside the insulating layer, an aramid rope is arranged in the center of the plurality of conductors, and the aramid rope is arranged outside the special-shaped core body. A belting layer, an inner protective layer, a steel tape armoring layer and an outer protective layer are sequentially arranged outside the conductors from inside to outside, and a filling layer is arranged among the conductors in the belting layer. The power cable provided by the utility model has the characteristics of flame retardance, no halogen, low smoke and no toxicity under the condition of meeting power transmission, not only improves the tensile strength of the cable, but also can reduce the manufacturing cost and the weight of the cable, meets the use requirements of the coal mine cable, and is high in practicability, simple in overall structure, reasonable in design and worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines. Background Art

[0002] Coal is the world's most abundant fossil resource, and my country boasts abundant reserves. Coal shearers are crucial equipment for mechanizing and modernizing coal mine production, reducing manual labor, improving safety, and achieving high production, high efficiency, and low energy consumption. With the continuous development of my country's coal industry, the development of cables for coal mines has also been rapid. However, due to the complex operating environment, harsh working conditions, and frequent movement of cables in coal mines, their service life is limited, placing higher demands on cable performance.

[0003] Currently, the sheath material of commonly used mining power cables is mostly polyvinyl chloride (PVC), a halogen-containing material. In the event of a fire, it releases large amounts of halogen acid gases and thick smoke. The halogen acid gases can be poisonous, and the thick smoke can cause suffocation and obstruct vision, compromising the safety of on-site personnel. Furthermore, the majority of cables currently used in the market utilize copper conductors. Due to the high cost of copper, this not only increases processing costs for manufacturers but also increases user costs. There is a growing demand for conductors made of materials other than copper. Among metal materials, aluminum offers advantages such as excellent conductivity, light weight, and low price. Furthermore, increasing environmental awareness in recent years has led to a demand for weight reduction to improve fuel efficiency in machinery. Therefore, replacing copper cables with aluminum-core cables is a trend. However, conventional aluminum-core cables suffer from poor mechanical properties and corrosion resistance. They cannot meet the excellent bending properties required for frequent movement in coal mines, nor can they meet the high electrical conductivity and mechanical strength requirements of the harsh environments of coal mines.

[0004] With the improvement of the mechanization level of coal mining enterprises, the demand for various mining cables in the coal mining industry is also increasing. In order to ensure the safety of coal mining, higher requirements are placed on the safety and reliability of cables for various purposes. After searching, the patent document with the authorization announcement number CN21125588U discloses a halogen-free, low-smoke, high-flammability special aluminum alloy low-voltage power cable, while the patent document with the authorization announcement number CN219658451U discloses a halogen-free, low-smoke aluminum alloy core power cable for coal mines. From the contents disclosed in the two retrieved patent documents, it can be seen that they provide a cable that meets the use requirements of coal mines from different angles. With the continuous development of my country's coal industry, the demand for cables for coal mines has also increased accordingly, and a large number of cables are needed. In order to enhance the competitiveness of enterprises, adapt to market demand, and increase market share, a cable different from that disclosed in the prior art is provided to meet the use requirements. Utility Model Content

[0005] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a power cable with a simple structure and stable performance. By using this power cable, while meeting the halogen-free, low-smoke and non-toxic characteristics, it can also reduce the production cost, reduce the cable weight, and meet the use requirements of cables for coal mines. Specifically, it is a halogen-free, low-smoke and flame-retardant aluminum alloy power cable for coal mines.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines, comprising a cable core, the cable core comprising multiple conductors, the conductors comprising a special-shaped core body, an insulating layer arranged outside the special-shaped core, and a water-blocking tape layer arranged outside the insulating layer, an aramid rope is arranged in the center of the multiple conductors, and a wrapping layer, an inner protective layer, a steel belt armor layer and an outer protective layer are arranged on the outside of the conductor from the inside to the outside, and a filling layer is provided between the multiple conductors in the wrapping layer.

[0007] Furthermore, a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model is adopted, wherein four conductors are provided, and the four conductors are arranged on the outside of the aramid rope in an external tangential state, wherein the special-shaped core is hinged by six special-shaped aluminum alloy conductors with a fan-shaped cross-section and a columnar aluminum alloy conductor with a circular cross-section, and the six special-shaped aluminum alloy conductors are evenly distributed in a ring shape on the outside of the columnar aluminum alloy conductor and are tangent to the side of the columnar aluminum alloy conductor; the insulation layer is formed by extruding a halogen-free, low-smoke, flame-retardant polyethylene insulation material, and the water-blocking tape layer is formed by double-layer wrapping of a water-swellable composite longitudinal water-blocking tape.

[0008] Furthermore, the halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model is adopted, and the filling layer is a halogen-free, flame-retardant glass fiber rope filling layer.

[0009] Furthermore, in the utility model, the halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines is used, and the tape layer is formed by wrapping the halogen-free, low-smoke, flame-retardant tape.

[0010] Furthermore, in the utility model, the halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines is adopted, and the inner sheath is formed by extrusion of highly flame-retardant chloroprene rubber.

[0011] Furthermore, in the halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model, the steel belt armor layer is formed by spirally wrapping two layers of galvanized steel belts.

[0012] Furthermore, the halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model is adopted, and the outer sheath is a wear-resistant halogen-free, low-smoke, flame-retardant polyolefin outer sheath.

[0013] The utility model adopts a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines. Firstly, the aramid rope arranged at the center of the conductor replaces the existing steel core, which not only enhances its tensile strength but also greatly reduces the weight of the cable; secondly, a special-shaped core is used to replace the existing copper core. Compared with the existing copper cable, the aluminum alloy cable has the advantages of being lighter, more flexible and more energy-efficient, and its economic efficiency far exceeds that of the copper cable. Compared with the simple aluminum core cable, the aluminum alloy cable can overcome the shortcomings of the aluminum core cable in terms of mechanical properties, bending performance, creep resistance and corrosion resistance, thus becoming safer; thirdly, An insulating layer and a water-blocking tape layer are provided outside the special-shaped core body. Under the premise of meeting the insulation performance, its waterproof performance can be enhanced, and it is suitable for use in underground humid environments; fourthly, a filling layer is provided between the conductors 1, and a tape layer, an inner sheath, a steel belt armor layer and an outer sheath are provided on the outside of the conductor. By adopting the above structure, the cable can meet the requirements of power transmission while having the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity, and can prevent the generation of a large amount of thick smoke and halogen acid harmful gases when the cable burns. It not only ensures the safety of the staff, but also reduces the weight of the cable and facilitates use, thereby ensuring the normal operation of the cable.

[0014] It can be seen that the power cable described in the present invention not only meets the conditions of power transmission, but also has the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity, which not only improves the tensile strength of the cable, but also reduces the production cost, reduces the weight of the cable, and meets the use requirements of coal mine cables. It has strong practicality, simple overall structure, reasonable design, and is worthy of promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in further detail below with reference to the accompanying drawings.

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] As shown in the figure: 1-conductor, 11-special-shaped core, 12-insulation layer, 13-water-blocking tape layer, 2-aramid rope, 3-filling layer, 4-tape layer, 5-inner sheath, 6-steel tape armor layer, 7-outer sheath. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of this utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0020] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0021] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0022] like Figure 1 As shown, the utility model describes a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines, comprising a cable core, the cable core comprising multiple conductors 1, the conductors 1 comprising a special-shaped core body 11, an insulating layer 12 arranged outside the special-shaped core body 11, and a water-blocking tape layer 13 arranged outside the insulating layer 12, an aramid rope 2 is arranged in the center of the multiple conductors 1, and a wrapping layer 4, an inner sheath 5, a steel belt armor layer 6 and an outer sheath 7 are sequentially arranged on the outside of the conductor 1 from the inside to the outside, and a filling layer 3 is provided between the multiple conductors 1 in the wrapping layer 4. Among them, there are four conductors 1, and the four conductors 1 are arranged in an external tangent state on the outside of the aramid rope 2. Among them, the special-shaped core 11 is formed by hingedly connecting six special-shaped aluminum alloy conductors with a fan-shaped cross-section and a cylindrical aluminum alloy conductor with a circular cross-section. The six special-shaped aluminum alloy conductors are evenly distributed in a ring shape on the outside of the cylindrical aluminum alloy conductor and are tangent to the side of the cylindrical aluminum alloy conductor; the insulating layer 12 is extruded with halogen-free low-smoke flame-retardant polyethylene insulation material, and the water-blocking tape layer 13 is formed by double-layer wrapping of water-swellable composite longitudinal water-blocking tape.

[0023] In the specific preparation process, a halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model is used, the filling layer 3 is a halogen-free, flame-retardant glass wire rope filling layer; the tape layer 4 is formed by wrapping a halogen-free, low-smoke, flame-retardant tape; the inner protective layer 5 is formed by extruding a high flame-retardant chloroprene rubber; the steel belt armor layer 6 is formed by spirally wrapping two layers of galvanized steel belts; the outer protective layer 7 is a wear-resistant, halogen-free, low-smoke, flame-retardant polyolefin outer sheath.

[0024] The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines described in the utility model is used in environments with relatively harsh working conditions. In order to meet the use requirements, the existing cable structure is improved. An aramid rope 2 is arranged at the center of the conductor 1 to replace the existing steel core. Since an aramid rope 2 is arranged at the center of multiple conductors 1, the aramid rope 2 is woven with aramid fiber. Aramid fiber has extremely high strength, and its weight-to-weight tensile strength is 6 times that of steel wire, 3 times that of glass fiber, and 2 times that of high-strength nylon industrial yarn; its tensile modulus is 3 times that of steel wire, 2 times that of glass fiber, and 10 times that of high-strength nylon industrial yarn; the continuous use temperature range of aramid is extremely wide, which can meet the long-term normal operation within different temperature ranges; it has the advantages of high temperature resistance, fire retardancy, light weight, high strength, low shrinkage, puncture resistance, cut resistance, wear resistance, heat resistance, chemical corrosion resistance and good mechanical properties. By adding aramid ropes 2 between the conductors 1, not only can the tensile strength of the cable be enhanced, but the weight of the cable can also be greatly reduced; secondly, a special-shaped core 11 is used to replace the existing copper core. Compared with the existing copper cable, the aluminum alloy cable has the advantages of being lighter, more flexible and more energy-efficient, and its economic efficiency far exceeds that of the copper cable. Compared with the pure aluminum core cable, the aluminum alloy cable can overcome the shortcomings of the aluminum core cable in terms of mechanical properties, bending properties, creep resistance, and corrosion resistance, thus becoming safer; thirdly, an insulating layer 12 and a water-blocking tape layer 13 are provided outside the special-shaped core 11. On the premise of meeting the insulation performance, its waterproof performance can also be enhanced, and it is suitable for use in underground humid environments; fourthly, a filling layer 3 is provided between the conductors 1, and a tape layer 4, an inner protective layer 5, a steel belt armor layer 6 and an outer protective layer 7 are provided on the outside of the conductor 1. By adopting the above structure, the cable can meet the power transmission requirements while not only having the characteristics of flame retardancy, halogen-free, low smoke and non-toxic, but also preventing the generation of a large amount of thick smoke and halogen acid harmful gases when the cable burns, which not only ensures the safety of the staff, but also reduces the weight of the cable and facilitates use, thereby ensuring the normal operation of the cable.

[0025] To sum up, the power cable described in the present invention not only meets the conditions of power transmission, but also has the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity, which not only improves the tensile strength of the cable, but also reduces the production cost, reduces the weight of the cable, and meets the use requirements of coal mine cables. It has strong practicality, simple overall structure, reasonable design, and is worthy of promotion and use.

[0026] Other aspects of the present invention that are not described in detail are all conventional technologies known to those skilled in the art.

[0027] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent replacements and improvements made based on the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines, comprising a cable core, wherein the cable core comprises a plurality of conductors (1), characterized in that: The conductor (1) comprises a special-shaped core (11), an insulating layer (12) arranged outside the special-shaped core (11), and a water-blocking tape layer (13) arranged outside the insulating layer (12); an aramid rope (2) is arranged in the center of the plurality of conductors (1); and a wrapping layer (4), an inner protective layer (5), a steel belt armor layer (6) and an outer protective layer (7) are sequentially arranged on the outside of the conductor (1) from the inside to the outside; and a filling layer (3) is provided between the plurality of conductors (1) within the wrapping layer (4).

2. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The conductors (1) are provided with four conductors, and the four conductors (1) are arranged on the outside of the aramid rope (2) in an external tangent state, wherein the special-shaped core (11) is formed by hingedly connecting six special-shaped aluminum alloy conductors with fan-shaped cross-sections and one columnar aluminum alloy conductor with a circular cross-section, and the six special-shaped aluminum alloy conductors are evenly distributed in a ring shape on the outside of the columnar aluminum alloy conductor and are tangent to the side of the columnar aluminum alloy conductor; the insulating layer (12) is formed by extruding a halogen-free low-smoke flame-retardant polyethylene insulating material, and the water-blocking tape layer (13) is formed by double-layer wrapping of a water-swellable composite longitudinal water-blocking tape.

3. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The filling layer (3) is a halogen-free flame-retardant glass rope filling layer.

4. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The wrapping tape layer (4) is formed by wrapping with a halogen-free, low-smoke, flame-retardant wrapping tape.

5. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The inner protective layer (5) is formed by extrusion of highly flame-retardant chloroprene rubber.

6. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The steel strip armor layer (6) is formed by spirally wrapping two layers of galvanized steel strips.

7. The halogen-free, low-smoke, flame-retardant aluminum alloy power cable for coal mines according to claim 1, characterized in that: The outer protective layer (7) is a wear-resistant, halogen-free, low-smoke, flame-retardant polyolefin outer sheath.

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