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

Abstract

The utility model discloses a halogen-free low-smoke flame-retardant shielding power cable for a coal mine, which comprises a cable core, the cable core comprises a plurality of conductors, an aramid rope is arranged in the center of the plurality of conductors, and a belting layer, an inner sheath, a steel tape armoring layer and a polyolefin sheath layer are sequentially arranged outside the conductors from inside to outside. And a filling layer is arranged among the plurality of conductors in the belting layer. By adopting the power cable provided by the utility model, the structure is improved, so that the power cable has the characteristics of flame retardance, no halogen, low smoke and no toxicity, the tensile strength of the cable can be improved through the aramid ropes arranged in the conductors and a multi-layer shielding mode, the problem of short circuit caused by damage of the cable cores due to external force is prevented, and the service life of the cable is prolonged. Therefore, the anti-electromagnetic interference capability of the cable is improved, the service life of the cable is prolonged, the use requirement of the cable for the coal mine is met, and the cable is high in practicability, simple in overall structure, reasonable in design and worthy of popularization and use.

Description

Technical Field

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

[0002] Coal is the most abundant fossil resource in the world. China has rich coal reserves. Coal mining machines are one of the important equipment to realize the mechanization and modernization of coal mine production, which can reduce physical labor, improve safety, and achieve the goals of high output, high efficiency, and low consumption. With the continuous development of China's coal industry, the cables for coal mines have also developed rapidly. Since the mining of the coal industry is mainly distributed below the ground surface, and the underground geological natural conditions are harsh, the working space is limited, and the situation is relatively complex. The coal mining is inseparable from the supply of power facilities. The sheath material of the commonly used mine power cables is mostly polyvinyl chloride, which is a halogen-containing material. In case of a fire, it will release a large amount of halogen acid gas and thick smoke. The halogen acid gas will cause poisoning, and the thick smoke will cause asphyxiation and block the line of sight, which is not conducive to ensuring the life safety of the on-site personnel.

[0003] Aiming at the fact that the cables for coal mines do not have the characteristics of being halogen-free, low-smoke, and non-toxic, and are not suitable for the high-temperature, flammable, and enclosed space usage requirements of coal mine operations. In order to ensure coal mining safety, higher requirements are put forward for the safety and reliability of the cables used in coal mine operations. After retrieval, the patent document with the authorization announcement number CN 217562270 U discloses a halogen-free low-smoke flame-retardant power cable for coal mines, and the patent document with the authorization announcement number CN201788737U discloses a shielded rubber-sheathed cable for electric drills in coal mines. From the content disclosed in the two retrieved patent documents, cables that meet the usage requirements of coal mines are provided from different perspectives. With the continuous development of China's coal industry, the demand for cables for coal mines has also increased correspondingly. A large number of cables are needed. In order to enhance the competitiveness of enterprises, meet market demands, and increase market share, a cable different from the ones disclosed in the prior art is provided to meet the usage requirements. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a power cable with a simple structure and stable performance in view of the problems in the background art. By using this power cable, on the premise of meeting the characteristics of being halogen-free, low-smoke, and non-toxic, it can not only avoid the short-circuit problem caused by the core being damaged due to external force during long-term use of the cable, but also improve its anti-electromagnetic interference ability, so as to meet the usage requirements of the cables for coal mines. Specifically, it is a halogen-free low-smoke flame-retardant shielded power cable for coal mines.

[0005] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: a halogen-free low-smoke flame-retardant shielded power cable for coal mines, which includes a cable core. The cable core includes a plurality of conductors, and an aramid rope is arranged at the center of the plurality of conductors. A tape layer, an inner sheath, a steel tape armor layer, and a polyolefin sheath layer are sequentially arranged outside the conductor from the inside to the outside. A filling layer is arranged between the plurality of conductors in the tape layer.

[0006] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, there are three conductors. The three conductors are arranged in an externally tangent state outside the aramid rope. The conductor includes a copper core body, and an inner shield layer, an insulating layer, an insulation shield, and an outer shield layer are arranged on the copper core body from the inside to the outside.

[0007] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the copper core body is stranded by a plurality of No. 5 copper conductors specified in GB / T3956-2008. The inner shield layer is a cross-linked semi-conductive conductor shield layer, the insulating layer is a halogen-free low-smoke flame-retardant polyethylene insulating layer, the insulation shield is a peeled semi-conductive insulation shield, and the outer shield layer is a copper tape shield layer.

[0008] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the filling layer is a halogen-free flame-retardant fiberglass rope filling layer.

[0009] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the tape layer is wound with a halogen-free low-smoke flame-retardant tape.

[0010] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the inner sheath is extruded with a highly flame-retardant chloroprene rubber.

[0011] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the steel tape armor layer is spirally wound with two layers of galvanized steel tapes.

[0012] Further, for a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to the present utility model, the polyolefin sheath layer is a halogen-free low-smoke flame-retardant polyolefin outer sheath.

[0013] Adopting a halogen-free low-smoke flame-retardant shielded power cable for coal mines described in the present utility model, since an inner shield layer, an insulating layer, an insulation shield and an outer shield layer are provided outside the copper core body, and a steel tape armor layer is provided outside the conductor. At the same time, since the tape layer provided outside the conductor is wound with a halogen-free low-smoke flame-retardant tape, the inner sheath is extruded with highly flame-retardant chloroprene rubber, the polyolefin sheath layer is a halogen-free low-smoke flame-retardant polyolefin outer sheath, and the filling layer is filled with halogen-free flame-retardant fiberglass ropes. By adopting the above structure, it is ensured that while the cable meets the requirements of power transmission, it also has the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity. Thus, when a fire occurs during the use of the cable, the cable will not produce a large amount of thick smoke and harmful halogen acid gases when burned, effectively ensuring the safety of the staff; in addition, adopting a multi-layer shielding structure can not only reduce the failure probability when the cable is short-circuited, but also enhance its anti-electromagnetic interference ability, thereby ensuring the normal operation of the cable.

[0014] It can be seen that by improving the structure of the power cable described in the present utility model, it has the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity. And by arranging aramid ropes in the conductor and adopting a multi-layer shielding method, the tensile strength of the cable can be improved, preventing the short-circuit problem caused by the damage of the wire core due to external force, thereby improving its anti-electromagnetic interference ability and prolonging the service life of the cable, so as to meet the use requirements of coal mine cables. It has strong practicability, a simple overall structure and reasonable design, and is worthy of popularization and use. Brief Description of the Drawings

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

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

[0017] As shown in the figure: 1 - conductor, 11 - copper core body, 12 - inner shield layer, 13 - insulating layer, 14 - insulation shield, 15 - outer shield layer, 2 - aramid rope, 3 - filling layer, 4 - tape layer, 5 - inner sheath, 6 - steel tape armor layer, 7 - polyolefin sheath layer. Specific Embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present utility model. Those familiar with this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0019] It should be noted that the structures, proportions, sizes, etc. depicted in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of this utility model. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that this utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of this utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of this utility model.

[0020] In the description of this utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

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

[0022] As Figure 1 shown, a halogen-free low-smoke flame-retardant shielded power cable for coal mines according to this utility model includes a cable core. The cable core includes a plurality of conductors 1. An aramid rope 2 is arranged at the center of the plurality of conductors (1). A tape layer 4, an inner sheath 5, a steel tape armor layer 6, and a polyolefin sheath layer 7 are sequentially arranged on the outer side of the conductor from the inside to the outside. A filling layer 3 is arranged between the plurality of conductors 1 in the tape layer 4. Among them, there are three conductors 1, and the three conductors 1 are arranged in an externally tangent state on the outer side of the aramid rope 2. The conductor 1 includes a copper core body 11, and an inner shielding layer 12, an insulating layer 13, an insulation shield 14, and an outer shielding layer 15 are arranged on the copper core body 11 from the inside to the outside.

[0023] When manufacturing a halogen-free low-smoke flame-retardant shielded power cable for coal mines as described in the present utility model, in the specific manufacturing process, the copper core 11 is stranded by a number of the 5th type of copper conductors specified in GB / T 3956-2008. The inner shield layer 12 is a cross-linked semi-conductive shield layer, the insulating layer 13 is a halogen-free low-smoke flame-retardant polyethylene insulating layer, the insulation shield 14 is a peelable semi-conductive insulation shield, and the outer shield layer 15 is a copper tape shield layer. The filling layer 3 is a halogen-free flame-retardant fiberglass rope filling layer. The tape layer 4 is wound with a halogen-free low-smoke flame-retardant tape. The inner sheath 5 is extruded with a highly flame-retardant chloroprene rubber. The steel tape armor layer 6 is helically wound with two layers of galvanized steel tape. The polyolefin sheath layer 7 is a halogen-free low-smoke flame-retardant polyolefin outer sheath.

[0024] When using a halogen-free low-smoke flame-retardant shielded power cable for coal mines as described in the present utility model, since an aramid rope 2 is provided at the center of multiple conductors 1, the aramid rope 2 is woven from aramid fibers. Aramid fibers have extremely high strength. The weight ratio of 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 in different temperature ranges. It has the advantages of high temperature resistance, fire and flame retardance, light weight, high strength, low shrinkage rate, puncture resistance, cut resistance, abrasion resistance, heat resistance, chemical corrosion resistance, and good mechanical properties. By adding the aramid rope 2 between the conductors 1, its tensile strength can be enhanced. At the same time, since the copper core 11 in the conductor 1 is stranded by a number of the 5th type of copper conductors specified in GB / T 3956-2008, due to the good electrical conductivity of the copper conductor, electricity can be transmitted over a longer distance. The softness and ductility of the copper conductor are very high, and it has good heat conduction performance. Using the conductor 1 stranded by the 5th type of copper conductor can ensure the electrical and mechanical properties of the cable. In addition, since an inner shield layer 12, an insulating layer 13, an insulation shield 14, and an outer shield layer 15 are provided outside the copper core 11, and a steel tape armor layer 6 is provided outside the conductor 1, the tape layer 4 outside the conductor 1 is wound with a halogen-free low-smoke flame-retardant tape, the inner sheath 5 is extruded with a highly flame-retardant chloroprene rubber, the polyolefin sheath layer 7 is a halogen-free low-smoke flame-retardant polyolefin outer sheath, and the filling layer 3 is filled with a halogen-free flame-retardant fiberglass rope. By adopting the above structure, it is ensured that while the cable meets the power transmission requirements, it also has the characteristics of flame retardance, halogen-free, low smoke, and non-toxicity. Thus, when a fire occurs during the use of the cable, the cable will not produce a large amount of thick smoke and harmful halogen acid gases when burned, effectively ensuring the safety of the staff. In addition, adopting a multi-layer shield structure can not only reduce the failure probability during cable short circuits but also enhance its anti-electromagnetic interference ability, thereby ensuring the normal operation of the cable.

[0025] In summary, by adopting the power cable of the present utility model and improving its structure, the cable has the characteristics of flame retardancy, halogen-free, low smoke and non-toxicity. Through the aramid rope 2 arranged in the conductor 1 and the multi-layer shielding method, the tensile strength of the cable can be improved, preventing the cable from being short-circuited due to the damage of the core caused by external force, thereby improving its anti-electromagnetic interference ability and extending the service life of the cable, meeting the usage requirements of coal mine cables. It has strong practicability, a simple overall structure and reasonable design, and is worthy of popularization and use.

[0026] Other details not elaborated in the present utility model are all well-known conventional technologies in the art.

[0027] The protection scope of the present utility model is not limited to the technical solutions disclosed in the specific embodiments. The above is only the preferred embodiment of the present utility model and does not limit the present utility model. Any minor modification, equivalent replacement and improvement made according to the technical solutions of the present utility model shall be included in the protection scope of the technical solutions of the present utility model.

Claims

1. A halogen-free low-smoke flame-retardant shielded power cable for coal mines, comprising a cable core, characterized in that: The cable core includes a plurality of conductors (1), an aramid rope (2) is arranged at the center of the plurality of conductors (1), a tape layer (4), an inner sheath (5), a steel tape armor layer (6) and a polyolefin sheath layer (7) are sequentially arranged outside the conductors from inside to outside, and a filling layer (3) is arranged between the plurality of conductors (1) in the tape layer (4).

2. The halogen-free low-smoke flame-retardant shielded power cable for coal mines according to claim 1, characterized in that: There are three conductors (1), and the three conductors (1) are arranged in an externally tangent state outside the aramid rope (2). The conductor (1) includes a copper core body (11), and an inner shielding layer (12), an insulating layer (13), an insulation shield (14) and an outer shielding layer (15) are arranged on the copper core body (11) from inside to outside.

3. A halogen-free low-smoke flame-retardant shielded power cable for coal mines according to claim 2, characterized in that: The copper core body (11) is stranded by a plurality of No. 5 copper conductors specified in GB / T 3956-2008. The inner shielding layer (12) is a cross-linked semi-conductive conductor shielding layer, the insulating layer (13) is a halogen-free low-smoke flame-retardant polyethylene insulating layer, the insulation shield (14) is a peeling type semi-conductive insulation shield, and the outer shielding layer (15) is a copper tape shielding layer.

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

5. A halogen-free low-smoke flame-retardant shielded power cable for coal mines according to claim 1, characterized in that: The tape layer (4) is wound with a halogen-free low-smoke flame-retardant tape.

6. The halogen-free low-smoke flame-retardant shielded power cable for coal mines according to claim 1, wherein: The inner sheath (5) is extruded with highly flame-retardant chloroprene rubber.

7. A halogen-free low-smoke flame-retardant shielded power cable for coal mines according to claim 1, characterized in that: The steel tape armor layer (6) is spirally wound with two layers of galvanized steel tapes.

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

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