Mining explosion-proof cable and preparation method thereof

Abstract

The invention relates to the technical field of explosion-proof cables, in particular to a mining explosion-proof cable and a preparation method thereof.The mining explosion-proof cable comprises a cable core, an insulating filling layer, a woven shielding layer, a water-blocking fireproof layer, an explosion-proof layer and an outer sheath layer, and the insulating filling layer, the woven shielding layer, the water-blocking fireproof layer, the explosion-proof layer and the outer sheath layer are sequentially arranged on the outer side of the cable core; the anti-rodent polyurea core-shell structure is arranged in the outer sheath layer, the structure arrangement is simple and reasonable, the anti-explosion layer is embedded with a protective steel wire, the compression resistance and impact resistance of the cable are effectively enhanced, the water-blocking fireproof layer can effectively isolate erosion of water and a fire source to the interior of the cable, and the anti-rodent polyurea core-shell structure is arranged in the outer sheath layer, so that the anti-rodent performance of the cable is improved. The cable can be effectively prevented from being bitten and damaged by common rats in a mine; according to the preparation method of the cable, automatic equipment is adopted for production in the processes of stranding, insulating treatment, shielding weaving, waterproof fireproof layer coating, explosion-proof layer manufacturing and outer sheath forming, so that the production efficiency is improved, and the stable quality of the cable can be effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof cables, and in particular to an explosion-proof cable for mining and a preparation method thereof. Background Art

[0002] With the research and development of modern technology in my country, mineral mining continues to advance into deep layers and areas with harsh environments. Various types of mine mining operations are increasing day by day. Signal cables are often needed to transmit data during mineral mining. Although there are explosion-proof cables on the market, due to the complexity of the mining environment, the performance requirements for mine explosion-proof cables are constantly increasing.

[0003] The mining cables currently on the market are not equipped with waterproof and anti-rat-bite components. Due to the harsh environment in the mine, the cables may be in a humid environment for a long time, and water may penetrate into the cables, causing damage to the cables. In addition, there are situations such as rat bites, which affect the normal use of the cables. In addition, the existing mining cables are explosion-proof with steel wire armor, which reduces the softness and flexibility of the cables and increases the weight of the cables, resulting in inconvenience in use.

[0004] In view of this, the present application aims to provide a mining explosion-proof cable and a preparation method thereof to better solve the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a mining explosion-proof cable and a preparation method thereof, which achieves better water-blocking and explosion-proof effects by arranging an explosion-proof layer, a water-blocking and fire-resistant layer, and a rat-proof polyurea core-shell structure in the outer sheath layer, and has good rat-proof effects, which can better meet mining needs.

[0006] The technical solution adopted by the present invention is:

[0007] A mining explosion-proof cable comprises a cable core and an insulating filling layer, a braided shielding layer, a water-blocking and fire-resistant layer, an explosion-proof layer and an outer sheath layer which are sequentially arranged along the outer side of the cable core. The cable core is composed of a power line core and a plurality of communication line cores. A protective steel wire is arranged in the explosion-proof layer and the protective steel wire is coiled along the length direction of the cable core. A rat-proof polyurea core-shell structure is arranged in the outer sheath layer.

[0008] Furthermore, the protective steel wire of the explosion-proof layer is wrapped with an explosion-proof material layer, and the explosion-proof material is made of the following components in parts by mass: 40-55 parts of polyurethane thermoplastic elastomer; 45-60 parts of modified silicone rubber; 20-30 parts of chlorinated polyethylene rubber; 5-10 parts of EVA; 15-20 parts of silicone resin; 10-15 parts of urea-formaldehyde resin; 5-10 parts of zinc chloride; 1-3 parts of zinc stearate; 3-6 parts of antimony trioxide; 12-20 parts of glass fiber; 3-9 parts of chlorinated paraffin; 10-18 parts of sodium polyacrylate; 0.5-5 parts of antioxidant; and 1-6 parts of anti-aging agent.

[0009] Furthermore, the rat-proof polyurea core-shell structure is composed of a polyurea core-shell and cycloheximide and capsaicin encapsulated therein.

[0010] Furthermore, the water-blocking and fire-resistant layer is made of a water-blocking and fire-resistant material, and the water-blocking and fire-resistant material is made of the following components in parts by mass: 55-65 parts of mica tape; 15-25 parts of silicone rubber adhesive; 8-12 parts of aluminum hydroxide flame retardant; 3-6 parts of mineral oil paste water-blocking agent; 3-5 parts of polymer water-absorbing resin water-blocking agent, and 2-3 parts of additives (antioxidant, plasticizer, stabilizer).

[0011] Furthermore, the insulating filling layer is made of polytetrafluoroethylene material;

[0012] The braided shielding layer is an aluminum-magnesium wire braided layer with a braiding density of 85%;

[0013] The outer sheath layer is made of ceramic silicone rubber material.

[0014] Furthermore, a plurality of heat-conducting channels distributed at intervals are provided in the insulating filling layer, and the heat-conducting channels are filled with graphite heat-conducting material.

[0015] Furthermore, the outer layers of the power line core and the communication line core are respectively provided with insulating rubber sleeves.

[0016] Based on the same inventive concept, the present application also provides a method for preparing the above-mentioned mining explosion-proof cable, comprising the following preparation steps:

[0017] S1.Material;

[0018] S2. Twisting the cable core, twisting the power line core and the communication line core into a main core;

[0019] S3. Insulation treatment, coating or extruding the insulating material around the cable core to form an insulating filling layer;

[0020] S4. Braided shielding: the braided shielding material is put on the insulated cable core and braided;

[0021] S5. A water-blocking and fire-resistant layer, which is coated or covered with a water-blocking and fire-resistant material on the outside of the braided shielding layer;

[0022] S6. Production of explosion-proof layer: winding the protective steel wire along the length direction of the cable core, and wrapping the explosion-proof material around the protective steel wire;

[0023] S7. Outer sheath molding: the outer sheath material is extruded through an extruder and coated on the outside of the explosion-proof layer, and then cooled and solidified to obtain a mining explosion-proof cable.

[0024] Further,

[0025] The steps for preparing the explosion-proof material used in the explosion-proof layer are as follows:

[0026] Prepare ingredients according to the recipe proportions;

[0027] Premixing EVA, silicone resin, urea-formaldehyde resin, zinc chloride, zinc stearate, antimony trioxide, glass fiber, chlorinated paraffin, and sodium polyacrylate to form a premix;

[0028] The polyurethane thermoplastic elastomer, modified silicone rubber and chlorinated polyethylene rubber are heated to a molten state; in the molten state, they are added into a melt blender together with the premix, all the components are fully mixed by stirring and shearing force to form a uniform mixture, and antioxidants and anti-aging agents are added during the melt blending process;

[0029] Then, the melt-blended mixture is extruded through an extruder and cooled through a cooling device to rapidly solidify and form an explosion-proof material;

[0030] The preparation steps of the water-blocking refractory material used in the water-blocking refractory layer are as follows:

[0031] Prepare ingredients according to the recipe proportions;

[0032] Ensure that the quality of all raw materials meets relevant standards, especially key parameters such as purity, particle size and activity.

[0033] The silicone rubber adhesive is mixed evenly with auxiliary antioxidants, plasticizers and stabilizers to form an adhesive system;

[0034] Gradually add aluminum hydroxide flame retardant to the adhesive system, stirring while adding to ensure that the flame retardant is evenly dispersed. Then, add mineral oil paste water-blocking agent and polymer water-absorbing resin water-blocking agent to the mixture, and continue stirring until all ingredients are fully mixed. Use a scraper to evenly apply the mixed adhesive system on the surface of the mica tape, and dry and cure the coated mica tape to obtain a water-blocking refractory material.

[0035] Furthermore, the steps for preparing the rat-proof polyurea core-shell structure are as follows:

[0036] The polyether polyol and the polyisocyanate are reacted to obtain an isocyanate prepolymer, and then an emulsifier and a solvent are added to react to obtain an isocyanate prepolymer emulsion, and then cycloheximide is added and stirred to obtain a cycloheximide emulsion;

[0037] reacting polyetheramine, capsaicin, emulsifier and solvent to obtain capsaicin emulsion;

[0038] The capsaicin emulsion is added drop by drop into the actinomycin emulsion to obtain a single-layer core-shell structure emulsion through polymerization reaction. Then, the isocyanate prepolymer emulsion is added drop by drop into the single-wall core-shell structure emulsion, and polymerization reaction is performed again to obtain a rat-proof double-layer polyurea core-shell structure.

[0039] The beneficial effects of the present invention are as follows:

[0040] 1. The mining explosion-proof cable provided by the present application comprises a cable core and an insulating filling layer, a braided shielding layer, a water-blocking and fire-resistant layer, an explosion-proof layer and an outer sheath layer sequentially arranged along the outer side of the cable core, wherein the cable core is composed of a power line core and a plurality of communication line cores, a protective steel wire is arranged in the explosion-proof layer, and the protective steel wire is coiled along the length direction of the cable core, and a rat-proof polyurea core-shell structure is arranged in the outer sheath layer, and the structure is simple and reasonable. Since the cable is provided with an explosion-proof layer, and the explosion-proof layer is embedded with a protective steel wire coiled along the length direction of the cable core, the compression and impact resistance of the cable are effectively enhanced, and the structural integrity can be maintained in a potential explosive environment, and the cable can be prevented from being damaged by external impact or internal pressure, thereby ensuring the safety of mine production and use. At the same time, a water-blocking and fire-resistant layer is arranged in the cable structure, which can It can effectively isolate the internal corrosion of the cable from moisture and fire sources, and can maintain the normal working state of the cable in extreme environments such as humidity or fire in mines, and prevent cable damage and signal interruption caused by moisture penetration or high temperature burning. In addition, the cable is equipped with a braided shielding layer, which can effectively reduce electromagnetic interference and protect the stability and clarity of signal transmission inside the cable, which is particularly important for the complex electromagnetic environment in mines. It can ensure the accuracy and reliability of communication and power transmission, and an anti-rat bite polyurea core-shell structure is arranged in the outer sheath layer, which can effectively prevent common rats in mines from gnawing and damaging the cable, and reduce the maintenance and replacement costs caused by rodent damage. The cable core of the cable provided in this application is composed of a power line core and multiple communication line cores, which can ensure the stable transmission of communication signals and achieve better mine use effects.

[0041] 2. The preparation method of the mining explosion-proof cable of the present application has a simple process flow and is easy to prepare. During the entire preparation process, twisting, insulation treatment, braided shielding, water-blocking and fire-resistant layer coating, explosion-proof layer production and outer sheath molding are all produced using automated equipment, which improves production efficiency and can effectively ensure the stable quality of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a flowchart of the preparation process of the mining explosion-proof cable in the embodiment of the present invention;

[0043] Figure 2 It is a schematic structural diagram of a mining explosion-proof cable in an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] Cable core 1, power line core 11, communication line core 12, insulating filling layer 2, heat conduction channel 21, braided shielding layer 3, water-blocking and fire-resistant layer 4, explosion-proof layer 5, protective steel wire 51, outer sheath layer 6, polyurea core-shell structure 61. DETAILED DESCRIPTION

[0046] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively by way of examples, and preferred embodiments of the present invention are given below. However, the present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. Any other implementation schemes obtained by modifying or equivalently replacing the technical scheme of the present invention without creative results are within the protection scope of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for describing specific embodiments and are not intended to limit the present invention.

[0048] The numerical values ​​disclosed in the embodiments of the present invention are approximate values, not definite values. When the error or experimental conditions permit, all values ​​within the error range may be included without being limited to the specific numerical values ​​disclosed in the embodiments of the present invention.

[0049] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0050] like Figure 1-2 As shown, the present embodiment provides an explosion-proof cable for mining, comprising a cable core 1 and an insulating filling layer 2, a braided shielding layer 3, a water-blocking and fire-resistant layer 4, an explosion-proof layer 5 and an outer sheath layer 6 which are sequentially arranged along the outer side of the cable core 1, the cable core 1 is composed of a power core 11 and a plurality of communication cores 12, a protective steel wire 51 is arranged in the explosion-proof layer 5, and the protective steel wire 51 is coiled along the length direction of the cable core 1, a rat-proof polyurea core-shell structure 61 is arranged in the outer sheath layer 6, a plurality of spaced-apart heat-conducting channels 21 are arranged in the insulating filling layer 2, and the heat-conducting channels 21 are filled with graphite heat-conducting material.

[0051] The mining explosion-proof cable is specifically prepared by the following preparation method:

[0052] S1. Prepare the required materials

[0053] The insulating filling layer is made of polytetrafluoroethylene material;

[0054] The braided shielding layer is an aluminum-magnesium wire braided layer with a braiding density of 85%;

[0055] The outer sheath layer is made of ceramic silicone rubber material;

[0056] The explosion-proof material used in the explosion-proof layer is prepared in the following steps:

[0057] Prepare the following materials by weight: 50 parts of polyurethane thermoplastic elastomer, 50 parts of modified silicone rubber, 25 parts of chlorinated polyethylene rubber, 5 parts of EVA, 20 parts of silicone resin, 15 parts of urea-formaldehyde resin, 10 parts of zinc chloride, 2 parts of zinc stearate, 3 parts of antimony trioxide, 15 parts of glass fiber, 6 parts of chlorinated paraffin, 15 parts of sodium polyacrylate, 1 part of antioxidant, and 2 parts of anti-aging agent;

[0058] Premixing EVA, silicone resin, urea-formaldehyde resin, zinc chloride, zinc stearate, antimony trioxide, glass fiber, chlorinated paraffin, and sodium polyacrylate to form a premix;

[0059] The polyurethane thermoplastic elastomer, modified silicone rubber and chlorinated polyethylene rubber are heated to a molten state; in the molten state, they are added into a melt blender together with the premix, all the components are fully mixed by stirring and shearing force to form a uniform mixture, and antioxidants and anti-aging agents are added during the melt blending process;

[0060] Then, the melt-blended mixture is extruded through an extruder and cooled through a cooling device to rapidly solidify and form an explosion-proof material;

[0061] The water-blocking refractory material used in the water-blocking refractory layer is prepared in the following steps:

[0062] Prepare 60 parts of mica tape, 20 parts of silicone rubber adhesive, 10 parts of aluminum hydroxide flame retardant, 5 parts of mineral ointment water-blocking agent, 3 parts of polymer water-absorbing resin water-blocking agent, and 2 parts of antioxidant, plasticizer, and stabilizer in total according to the mass proportion;

[0063] The silicone rubber adhesive is mixed evenly with auxiliary antioxidants, plasticizers and stabilizers to form an adhesive system;

[0064] Gradually add aluminum hydroxide flame retardant to the adhesive system, stirring while adding to ensure that the flame retardant is evenly dispersed, then add mineral paste water-blocking agent and polymer water-absorbing resin water-blocking agent to the mixture, continue stirring until all ingredients are fully mixed, use a scraper to evenly apply the mixed adhesive system on the surface of the mica tape, dry and cure the coated mica tape, and obtain a water-blocking refractory material;

[0065] The steps for preparing the rat-proof polyurea core-shell structure are as follows:

[0066] The polyether polyol and polyisocyanate in a mass ratio of 3:1.5 are reacted to obtain an isocyanate prepolymer, and then an emulsifier and a solvent are added in a mass ratio of 5:1:16 to the isocyanate prepolymer to react to obtain an isocyanate prepolymer emulsion, and then cycloheximide is added and stirred, and the mass ratio of cycloheximide to the isocyanate prepolymer is 1:1 to obtain a cycloheximide emulsion, wherein;

[0067] The polyetheramine, capsaicin, and emulsifier in a mass ratio of 5:5:1:20 are reacted with solvent n-pentane to obtain a capsaicin emulsion;

[0068] The capsaicin emulsion is dripped into the cycloheximide emulsion drop by drop, and a single-layer core-shell structure emulsion is obtained through polymerization reaction, and then the isocyanate prepolymer emulsion is dripped into the single-wall core-shell structure emulsion, and polymerization reaction is performed again, wherein the mass ratio of the isocyanate prepolymer emulsion, the cycloheximide emulsion and the capsaicin emulsion is 1:2:2 to obtain a rat-proof double-layer polyurea core-shell structure;

[0069] S2. Twisting the cable core, twisting the power line core and the communication line core into a main core;

[0070] S3. Insulation treatment, coating or extruding the insulating material around the cable core to form an insulating filling layer;

[0071] S4. Braided shielding: the braided shielding material is put on the insulated cable core and braided;

[0072] S5. A water-blocking and fire-resistant layer, which is coated or covered with a water-blocking and fire-resistant material on the outside of the braided shielding layer;

[0073] S6. Production of explosion-proof layer: winding the protective steel wire along the length direction of the cable core, and wrapping the explosion-proof material around the protective steel wire;

[0074] S7. Outer sheath molding: the outer sheath material is extruded through an extruder and coated on the outside of the explosion-proof layer, and then cooled and solidified to obtain a mining explosion-proof cable.

[0075] Comparative Example 1

[0076] The difference between this comparative example and Example 1 is that the rat-proof polyurea core-shell structure is not provided in the outer sheath layer.

[0077] Comparative Example 2

[0078] The difference between this comparative example and Example 1 is that no water-blocking and fire-resistant layer is provided.

[0079] The cables in the above embodiment and comparative examples 1-2 were subjected to a rat bite resistance test:

[0080] The surface of the test material sample in the embodiment has light tooth marks from rats gnawing, and the protection rate is ≥90%. After the test sample is placed at room temperature for 3 months, a rat bite resistance test is carried out. The surface of the test material sample has light tooth marks from rats gnawing, and the protection rate is ≥90%. It can be seen that the cable provided in the embodiment of the present application has significant rat bite resistance performance.

[0081] The surface of the test material sample in the embodiment has light tooth marks from rats gnawing, and the protection rate is ≥90%. After the test sample is placed at room temperature for 3 months, a rat bite resistance test is carried out. The surface of the test material sample has light tooth marks from rats gnawing, and the protection rate is ≥90%. It can be seen that the cable provided in the embodiment of the present application has significant rat bite resistance performance.

[0082] The surface of the test material sample in Comparative Example 1 has heavy teeth marks from rats biting, the biting depth is greater than 2 / 3 of the thickness of the protective layer, the surface of the protective layer is not bitten through, and the protection rate is ≥30%. It can be seen that the test sample has average anti-rat biting performance.

[0083] The test results of the test samples in Comparative Example 2 are comparable to those in Example 1.

[0084] The cables in the above embodiment and comparative examples 1-2 were subjected to immersion waterproof test:

[0085] The cables in the embodiment and comparative example 1 were immersed in water for half a year at normal temperature and pressure without any water seepage, while the cable in comparative example 2 had slight water seepage. It can be seen that the provision of the water-blocking and fire-resistant layer in the present application has achieved good waterproof performance.

[0086] The cables in the above embodiments and comparative examples 1-2 were subjected to flame retardancy tests:

[0087] According to the national standard GB / T 12666.5-2018, the flame retardant test was carried out. Both the embodiment and comparative example 1 met the standard, and the test sample in comparative example 2 did not meet the standard. It can be seen that the provision of the water-blocking and fire-resistant layer in the present application has achieved good flame retardant performance.

[0088] In addition, since a protective steel wire is provided in the explosion-proof layer of the present application, and the protective steel wire is coiled along the length direction of the cable core, it has a certain elasticity, so that the cable provided by the present application has a better explosion-proof effect when subjected to external impact or internal pressure.

[0089] In summary, the mining explosion-proof cable provided by the present application has a simple structural setting and is easy to prepare. It effectively enhances the cable's compression and impact resistance by arranging an explosion-proof layer, and the explosion-proof layer is embedded with a protective steel wire coiled along the length of the cable core. It can maintain the integrity of the structure in a potential explosion environment and prevent the cable from being damaged by external impact or internal pressure, thereby ensuring the safety of mine production and use. At the same time, a water-blocking and fire-resistant layer is arranged in the cable structure, which can effectively isolate the internal erosion of the cable from moisture and fire sources. In extreme environments such as humidity or fire in mines, the cable can maintain its normal working state to prevent moisture penetration or high temperature burning. Cable damage and signal interruption caused by burning. In addition, the cable is equipped with a braided shielding layer, which can effectively reduce electromagnetic interference and protect the stability and clarity of signal transmission inside the cable, which is especially important for the complex electromagnetic environment in mines. It can ensure the accuracy and reliability of communication and power transmission, and an anti-rat bite polyurea core-shell structure is arranged in the outer sheath layer, which can effectively prevent common rodents in mines from gnawing and damaging the cable, and reduce the maintenance and replacement costs caused by rodent damage. The cable core provided in this application is composed of a power line core and multiple communication line cores, which can ensure the stable transmission of communication signals and achieve better mine use effects.

[0090] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A mining explosion-proof cable, characterized in that: It includes a cable core and an insulating filling layer, a braided shielding layer, a water-blocking and fire-resistant layer, an explosion-proof layer and an outer sheath layer which are sequentially arranged along the outer side of the cable core. The cable core is composed of a power line core and a plurality of communication line cores. A protective steel wire is arranged in the explosion-proof layer, and the protective steel wire is coiled along the length direction of the cable core. A rat-proof polyurea core-shell structure is arranged in the outer sheath layer.

2. The explosion-proof cable for mining according to claim 1, characterized in that: The protective steel wire of the explosion-proof layer is wrapped with an explosion-proof material layer, and the explosion-proof material is made of the following components by mass: 40-55 parts of polyurethane thermoplastic elastomer; 45-60 parts of modified silicone rubber; 20-30 parts of chlorinated polyethylene rubber; 5-10 parts of EVA; 15-20 parts of silicone resin; 10-15 parts of urea-formaldehyde resin; 5-10 parts of zinc chloride; 1-3 parts of zinc stearate; 3-6 parts of antimony trioxide; 12-20 parts of glass fiber; 3-9 parts of chlorinated paraffin; 10-18 parts of sodium polyacrylate; 0.5-5 parts of antioxidant; 1-6 parts of anti-aging agent.

3. The explosion-proof cable for mining according to claim 1, characterized in that: The rat-biting-proof polyurea core-shell structure consists of a polyurea core-shell and cycloheximide and capsaicin wrapped therein.

4. The explosion-proof cable for mining according to claim 1, characterized in that: The water-blocking and fire-resistant layer is made of a water-blocking and fire-resistant material, and the water-blocking and fire-resistant material is made of the following components in parts by mass: 55-65 parts of mica tape; 15-25 parts of silicone rubber adhesive; 8-12 parts of aluminum hydroxide flame retardant; 3-6 parts of mineral oil paste water-blocking agent; 3-5 parts of polymer water-absorbing resin water-blocking agent, and 2-3 parts of additives (antioxidant, plasticizer, stabilizer).

5. The explosion-proof cable for mining according to claim 1, characterized in that: The insulating filling layer is made of polytetrafluoroethylene material; The braided shielding layer is an aluminum-magnesium wire braided layer with a braiding density of 85%; The outer sheath layer is made of ceramic silicone rubber material.

6. The explosion-proof cable for mining according to claim 1, characterized in that: A plurality of heat-conducting channels distributed at intervals are arranged in the insulating filling layer, and the heat-conducting channels are filled with graphite heat-conducting material.

7. The explosion-proof cable for mining according to claim 1, characterized in that: The outer layers of the power line core and the communication line core are respectively provided with insulating rubber sleeves.

8. A method for preparing a mining explosion-proof cable according to any one of claims 1 to 7, characterized in that: The method comprises the following preparation steps: S1.Material; S2. Twisting the cable core, twisting the power line core and the communication line core into a main core; S3. Insulation treatment, coating or extruding the insulating material around the cable core to form an insulating filling layer; S4. Braided shielding: the braided shielding material is put on the insulated cable core and braided; S5. A water-blocking and fire-resistant layer, which is coated or covered with a water-blocking and fire-resistant material on the outside of the braided shielding layer; S6. Production of explosion-proof layer: winding the protective steel wire along the length direction of the cable core, and wrapping the explosion-proof material around the protective steel wire; S7. Outer sheath molding: the outer sheath material is extruded through an extruder and coated on the outside of the explosion-proof layer, and then cooled and solidified to obtain a mining explosion-proof cable.

9. The method for preparing a mining explosion-proof cable according to claim 8, characterized in that: The steps for preparing the explosion-proof material used in the explosion-proof layer are as follows: Prepare ingredients according to the recipe proportions; Premixing EVA, silicone resin, urea-formaldehyde resin, zinc chloride, zinc stearate, antimony trioxide, glass fiber, chlorinated paraffin, and sodium polyacrylate to form a premix; Heat the polyurethane thermoplastic elastomer, modified silicone rubber and chlorinated polyethylene rubber to a molten state; In a molten state, it is added into a melt blender together with the premix, and all the components are fully mixed by stirring and shearing force to form a uniform mixture, and antioxidants and anti-aging agents are added during the melt blending process; Then, the melt-blended mixture is extruded through an extruder and cooled through a cooling device to rapidly solidify and form an explosion-proof material; The preparation steps of the water-blocking refractory material used in the water-blocking refractory layer are as follows: Prepare ingredients according to the recipe proportions; Ensure that the quality of all raw materials meets relevant standards, especially key parameters such as purity, particle size and activity. The silicone rubber adhesive is mixed evenly with auxiliary antioxidants, plasticizers and stabilizers to form an adhesive system; Gradually add aluminum hydroxide flame retardant to the adhesive system, stirring while adding to ensure that the flame retardant is evenly dispersed. Then, add mineral oil paste water-blocking agent and polymer water-absorbing resin water-blocking agent to the mixture, and continue stirring until all ingredients are fully mixed. Use a scraper to evenly apply the mixed adhesive system on the surface of the mica tape, and dry and cure the coated mica tape to obtain a water-blocking refractory material.

10. The method for preparing a mining explosion-proof cable according to claim 8, characterized in that: The steps for preparing the rat-proof polyurea core-shell structure are as follows: The polyether polyol and the polyisocyanate are reacted to obtain an isocyanate prepolymer, and then an emulsifier and a solvent are added to react to obtain an isocyanate prepolymer emulsion, and then cycloheximide is added and stirred to obtain a cycloheximide emulsion; reacting polyetheramine, capsaicin, emulsifier and solvent to obtain capsaicin emulsion; The capsaicin emulsion is added drop by drop into the actinomycin emulsion to obtain a single-layer core-shell structure emulsion through polymerization reaction. Then, the isocyanate prepolymer emulsion is added drop by drop into the single-wall core-shell structure emulsion, and polymerization reaction is performed again to obtain a rat-proof double-layer polyurea core-shell structure.

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