Waterproof and flame-retardant mining cable sheath and cable

Abstract

The utility model relates to a waterproof flame-retardant mining cable sheath and a cable, which belong to the technical field of mining cables, and comprise three cable conductors, and the outer sides of the three cable conductors are provided with a cable sheath body. The beneficial effects of the utility model lie in that in the working process, the cable conductors are protected by the insulating layers, so that safe transmission of current can be ensured, the inner sheath provides basic insulation and flexibility, and the modified polyurethane material of the middle layer effectively prevents moisture intrusion and fire accidents through excellent waterproof and flame-retardant properties, so that the cable is suitable for popularization and application. The fluoroplastic material of the outer protective layer provides extra weather resistance and chemical corrosion resistance, long-term stable operation of the cable in a severe environment is ensured, the waterproof performance of the cable sheath body is improved through the effect of the nano silicon dioxide coating, moisture invasion is effectively prevented, and the service life of a cable conductor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of mining cable technology, and in particular to a waterproof and flame-retardant mining cable sheath and cable. Background Technology

[0002] Power cables for coal mines are suitable for power transmission lines inside coal mines. Due to the harsh environment in mines, where oil and water are frequently present, the cable itself faces severe challenges. Long-term immersion in this oil-water mixture easily corrodes and damages the sheath. When water enters the sheath, the electric field causes water treeing in weak areas of the insulation material, ultimately leading to insulation breakdown. Furthermore, in the event of a fire in the mine, the cable must possess high flame-retardant properties to prevent the spread of the accident. Existing waterproof coatings for mining cables are mostly located in the interlayer, failing to form an effective external barrier; the external flame-retardant coating often poses safety hazards due to the lack of insulation on the conductive materials. Therefore, a waterproof and flame-retardant mining cable sheath and cable with optimized waterproof coating placement and ensured insulation of the external flame-retardant coating are needed. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of this utility model is to provide a waterproof and flame-retardant mining cable sheath and cable.

[0004] The technical solution of this utility model is as follows: a waterproof and flame-retardant mining cable sheath and cable, including cable conductors, three of which are provided, and a cable sheath body is provided on the outside of the three cable conductors. The cable sheath body includes, from the inside to the outside, an inner sheath, an intermediate layer wrapped around the outer periphery of the inner sheath, a nano-silica coating wrapped around the outer periphery of the intermediate layer, an outer sheath wrapped around the outer periphery of the nano-silica coating, and a graphene coating wrapped around the outer periphery of the outer sheath.

[0005] By adopting the above technical solutions, the cable conductor can ensure the safe transmission of current through the protection of the insulation layer. The inner sheath provides basic insulation and flexibility, while the modified polyurethane material in the middle layer effectively prevents moisture intrusion and fire accidents through its excellent waterproof and flame-retardant properties. The fluoroplastic material in the outer sheath provides additional weather resistance and chemical corrosion resistance, ensuring the long-term stable operation of the cable in harsh environments.

[0006] In a preferred embodiment, a hot melt adhesive is provided between the intermediate layer and the outer sheath, and the intermediate layer, the nano-silica coating, and the outer sheath are bonded together by the hot melt adhesive. An adhesive is provided between the inner sheath and the intermediate layer, and the inner sheath and the intermediate layer are tightly bonded together by the adhesive.

[0007] By adopting the above technical solution, the materials of each layer are bonded together with adhesives and hot melt adhesives to form a whole, which enhances the structural strength and sealing performance of the cable sheath body.

[0008] In a preferred embodiment, the inner protective layer is made of polyethylene, the middle layer is made of modified polyurethane, and the outer protective layer is made of fluoroplastic.

[0009] By adopting the above technical solution and using the outer protective layer of fluoroplastic material, it has excellent weather resistance and chemical corrosion resistance.

[0010] In a preferred embodiment, a high flame-retardant filler layer is provided between the cable conductor and the inner sheath, and the high flame-retardant filler layer contains a flame retardant.

[0011] By adopting the above technical solution and adding flame retardants, the flame retardant performance of the cable sheath can be further enhanced.

[0012] In a preferred embodiment, the outer side of the cable conductor is wrapped with an insulation layer, which is made of cross-linked polyethylene material.

[0013] By adopting the above technical solution and setting the insulation layer of cross-linked polyethylene material, the cable conductor can have excellent electrical properties and temperature resistance.

[0014] In a preferred embodiment, the adhesive is a two-component epoxy resin, the hot melt adhesive is a polyamide hot melt adhesive, and the cable conductor is a copper core.

[0015] By adopting the above technical solution, the two-component epoxy resin and polyamide hot melt adhesive have good bonding effect, high viscosity and good stability.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] In this invention, during operation, the cable conductor, protected by the insulation layer, ensures safe current transmission. The inner sheath provides basic insulation and flexibility, while the modified polyurethane material in the middle layer effectively prevents moisture intrusion and fire accidents due to its excellent waterproof and flame-retardant properties. The fluoroplastic material in the outer sheath provides additional weather resistance and chemical corrosion resistance, ensuring long-term stable operation of the cable in harsh environments. The nano-silica coating improves the waterproof performance of the cable sheath, effectively preventing moisture intrusion and extending the service life of the cable conductor. Furthermore, the addition of a graphene coating to the surface of the outer sheath further enhances the flame-retardant properties of the cable sheath, reducing the risk of fire accidents and improving the safety of the cable conductor. The above structure improves the weather resistance and chemical corrosion resistance of the cable sheath, ensuring long-term stable operation of the cable conductor in harsh environments. Attached Figure Description

[0018] Figure 1 This utility model provides a waterproof and flame-retardant mining cable sheath and an overall perspective view of the cable;

[0019] Figure 2 This utility model provides a waterproof and flame-retardant mining cable sheath and a cross-sectional view of the cable;

[0020] Figure 3 This utility model provides a waterproof and flame-retardant mining cable sheath and cable. Figure 2 Enlarged view of point A in the middle.

[0021] Legend: 1. Cable conductor; 2. Cable sheath body; 201. Outer sheath; 202. Intermediate layer; 203. Inner sheath; 3. Graphene coating; 4. High flame retardant filler layer; 5. Insulation layer; 6. Nano silica coating. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] Reference Figure 1-3A waterproof and flame-retardant mining cable sheath and cable are disclosed, comprising cable conductors 1, of which three are provided. A cable sheath body 2 is disposed on the outer side of each of the three cable conductors 1. The cable sheath body 2, from the inside out, comprises an inner sheath 203, an intermediate layer 202 surrounding the inner sheath 203, a nano-silica coating 6 surrounding the intermediate layer 202, an outer sheath 201 surrounding the nano-silica coating 6, and a graphene coating 3 surrounding the outer sheath 201. During operation, the cable conductors 1, protected by the insulation layer 5, ensure safe current transmission. The inner sheath 203 provides basic insulation and flexibility, and the modified polyurethane material of the intermediate layer 202 provides excellent waterproofing. The outer sheath 201, with its flame-retardant properties, effectively prevents moisture intrusion and fire accidents. The fluoroplastic material provides additional weather resistance and chemical corrosion resistance, ensuring long-term stable operation of the cable in harsh environments. The nano-silica coating 6 enhances the waterproof performance of the cable sheath body 2, effectively preventing moisture intrusion and extending the service life of the cable conductor 1. Furthermore, the addition of a graphene coating 3 to the surface of the outer sheath 201 further enhances the flame-retardant properties of the cable sheath body 2, reducing the risk of fire accidents and improving the safety of the cable conductor 1. These structures improve the weather resistance and chemical corrosion resistance of the cable sheath body 2, ensuring long-term stable operation of the cable conductor 1 in harsh environments.

[0024] Reference Figure 3 A hot melt adhesive is provided between the intermediate layer 202 and the outer sheath 201. The intermediate layer 202, the nano-silica coating 6 and the outer sheath 201 are bonded together by the hot melt adhesive. An adhesive is provided between the inner sheath 203 and the intermediate layer 202. The inner sheath 203 and the intermediate layer 202 are tightly bonded together by the adhesive. The materials of each layer are bonded together by the adhesive and the hot melt adhesive to form a whole, which enhances the structural strength and sealing performance of the cable sheath body 2.

[0025] Reference Figure 3 The inner sheath 203 is made of polyethylene, the middle layer 202 is made of modified polyurethane, and the outer sheath 201 is made of fluoroplastic. The inner sheath 203 made of polyethylene provides good insulation and flexibility, the middle layer 202 made of modified polyurethane provides excellent waterproof and flame retardant properties, and the outer sheath 201 made of fluoroplastic provides excellent weather resistance and chemical corrosion resistance.

[0026] Reference Figure 2 A high flame-retardant filler layer 4 is provided between the cable conductor 1 and the inner sheath 203. The high flame-retardant filler layer 4 contains a flame retardant. By setting the flame retardant, the flame-retardant performance of the cable sheath body 2 can be further enhanced, reducing the risk of fire.

[0027] Reference Figure 2 The outer side of the cable conductor 1 is wrapped with an insulation layer 5. The insulation layer 5 is made of cross-linked polyethylene material. By setting the insulation layer 5 of cross-linked polyethylene material, the cable conductor 1 can have excellent electrical performance and temperature resistance.

[0028] Reference Figure 1 The adhesive uses two-component epoxy resin, the hot melt adhesive uses polyamide hot melt adhesive, and the cable conductor 1 uses copper core. The two-component epoxy resin and polyamide hot melt adhesive have good bonding effect, high viscosity, and good stability.

[0029] Working principle: First, during operation, the cable conductor 1 is protected by the insulation layer 5, which ensures the safe transmission of current. The inner sheath 203 provides basic insulation and flexibility. The modified polyurethane material of the intermediate layer 202 effectively prevents moisture intrusion and fire accidents through its excellent waterproof and flame-retardant properties. The fluoroplastic material of the outer sheath 201 provides additional weather resistance and chemical corrosion resistance, ensuring the long-term stable operation of the cable in harsh environments.

[0030] Furthermore, the waterproof performance of the cable sheath body 2 is improved through the nano-silica coating 6, effectively preventing moisture intrusion and extending the service life of the cable conductor 1. In addition, a graphene coating 3 is added to the surface of the outer sheath 201, which further enhances the flame retardant performance of the cable sheath body 2, reduces the risk of fire accidents, and improves the safety of the cable conductor 1. The above structure improves the weather resistance and chemical corrosion resistance of the cable sheath body 2, ensuring the long-term stable operation of the cable conductor 1 in harsh environments. The materials of each layer inside the cable sheath body 2 are bonded together by adhesives and hot melt adhesives to form a whole, which enhances the structural strength and sealing performance of the cable sheath body 2.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] The above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A flame-retardant, water-resistant, mining cable sheath and cable comprising a cable conductor (1), characterised in that: The cable conductor (1) is provided with three, and the outer side of the three cable conductors (1) is provided with a cable sheath body (2), the cable sheath body (2) comprises an inner sheath (203), an intermediate layer (202) wrapped on the outer periphery of the inner sheath (203), a nanometer silicon dioxide coating (6) wrapped on the outer periphery of the intermediate layer (202), an outer sheath (201) wrapped on the outer periphery of the nanometer silicon dioxide coating (6) and a graphene coating (3) wrapped on the outer periphery of the outer sheath (201) from inside to outside, a hot melt adhesive is arranged between the intermediate layer (202) and the outer sheath (201), the intermediate layer (202), the nanometer silicon dioxide coating (6) and the outer sheath (201) are bonded by the hot melt adhesive, an adhesive is arranged between the inner sheath (203) and the intermediate layer (202), the inner sheath (203) and the intermediate layer (202) are tightly bonded by the adhesive, the inner sheath (203) is made of polyethylene material, the intermediate layer (202) is made of modified polyurethane material, and the outer sheath (201) is made of fluoroplastic material.

2. A flame and water retardant mine cable sheath and cable according to claim 1 characterised in that: The cable conductor (1) is provided with a high flame-retardant filling layer (4) between the cable conductor (1) and the inner sheath (203), and the high flame-retardant filling layer (4) is provided with a flame retardant.

3. A flame and water retardant mine cable sheath and cable according to claim 1 characterised in that: The outer side of the cable conductor (1) is wrapped with an insulating layer (5), and the insulating layer (5) is made of crosslinked polyethylene material.

4. A flame and water retardant mine cable sheath and cable according to claim 1 characterised in that: The adhesive is two-component epoxy resin, the hot melt adhesive is polyamide hot melt adhesive, and the cable conductor (1) is made of copper core.

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