A mooring device for a fire-fighting unmanned aerial vehicle and a manufacturing method and a recycling method thereof

Abstract

The application is a kind of mooring device for fire-fighting unmanned aerial vehicle, comprising a cable and a fire-fighting medium pipe, the cable comprises a plurality of cable conductors, an insulation layer is arranged outside the cable conductors, an inner protective layer and an outer protective layer are arranged outside the insulation layer, a braided tensile layer is further arranged between the inner protective layer and the outer protective layer, the fire-fighting medium pipe is composed of a fire hose and a fabric layer, the cable and the fire-fighting medium pipe are arranged side by side, and are connected into an integrated body through a unified sheath and a connecting body. The beneficial effect is that the cable and the fire-fighting medium pipe are connected into an integrated body through a unified sheath and a connecting body, the structure is simple, the practicability is strong, the fire-fighting medium pipe can adopt a fire hose with a standard of 2.5Mpa, 3.5Mpa or 4.5Mpa, the working pressure can meet the requirement of sufficient spraying power when water is sent to a height of more than 200 meters, a standard pipe diameter is adopted, a standard fire hose connector can be used, and it is beneficial to the use of fire-fighting water and the replacement of corresponding accessories in an accident.

Description

Technical Field

[0001] This invention belongs to the field of wire and cable technology, and specifically relates to a tethering device for firefighting drones and its manufacturing and recycling methods. Background Technology

[0002] Currently, tethered fire hose drones on the market suffer from limitations in propeller motor power due to the drone's battery capacity, directly impacting its payload and operating time. A common approach is to add a separate tethering power source and a standard fire hose to the drone. However, this method causes the two tethering devices to twist during drone operation, and the retrieval process after use is complex. To address this, current market practices involve concentrically designing the fire hose conduit and cable. Some methods place the fire hose conduit in the center of the cable, with a conductor wrapped around its outer edge (publication number CN109300580A); others place the fire hose conduit outside the cable (publication number CN115376747A). However, both of these structures suffer from the following problems:

[0003] (1) When the fire-fighting medium is water, the water needs to be delivered to a height of 200 meters and have a certain jetting power. The bottom water pressure needs to be at least 2.5 MPa. The above scheme cannot meet the pressure resistance problem of the fire-fighting medium pipe.

[0004] (2) The tensile strength of the fire medium pipe. Taking a 50mm diameter fire water pipe as an example, if the fire medium is water, the weight of the water when it is sent to a height of 200 meters is 400kg, and the total weight of the medium pipe and various joints is about 500kg.

[0005] (3) The problem of the joint between the fire medium pipe and the cable: the above-mentioned solutions do not use standard pipes and interfaces of the fire protection system, which limits the use of the products.

[0006] (4) The consumable nature of fire-fighting medium pipes: fire-fighting medium pipes such as fire hoses in fire-fighting systems need to be tested after use and are replaced frequently. If the cable and the fire-fighting medium pipe cannot be separated, the corresponding cable will also be scrapped when the fire-fighting medium pipe does not meet the requirements, resulting in a waste of resources.

[0007] (5) Cable storage problem. As we all know, fire hoses take up little space when not filled with water. The above two solutions cannot guarantee the space occupied during the regular storage of cables. Summary of the Invention

[0008] To solve the above-mentioned technical problems, this invention provides a simple, practical, and reusable tethering device for dual-medium transmission firefighting drones, as well as its manufacturing and recovery methods.

[0009] The technical solution is as follows:

[0010] A tethering device for firefighting drones includes a cable and a fire-fighting medium pipe. The cable comprises a plurality of cable conductors, an insulation layer is provided outside the cable conductors, an inner sheath and an outer sheath are provided outside the insulation layer, and a braided tensile layer is provided between the inner and outer sheaths. The fire-fighting medium pipe is composed of a fire hose and a fabric layer. The cable and the fire-fighting medium pipe are arranged in parallel and connected as a whole by a sheath and a connector.

[0011] As a further improvement, a high-strength tear cord is provided between the outer sheath and the overall sheath.

[0012] As a further improvement, the cable also includes a communication optical fiber and a control unit.

[0013] As a further improvement, 5-7 copper foil wires are arranged at the center of the cable conductor. The center of the copper foil wire is a 500D bulletproof wire. The copper foil wire is formed by spirally wrapping copper foil around the bulletproof wire. Several lightweight tin-plated copper-clad aluminum wires are arranged on the outside of the copper foil wires to transmit electrical energy. The diameter of the tin-plated copper-clad aluminum wires is not greater than 0.15mm. At the same time, the bundle diameter ratio is not greater than 20 times during the manufacturing process, and the diameter ratio is not greater than 15 times during the twisting process. The braided tensile layer is made of bulletproof wire fibers with a tensile strength of not less than 25.9cN / dtex. The total burst load of the bulletproof wires used for braiding is not less than 600kg, that is, the total number of bulletproof wires used for braiding is not less than 21,000 denier. The braiding angle should not be less than 55° during the braiding production.

[0014] As a further improvement, the fabric layer is made of warp and weft yarns using a 2 / 1 twill circular weave. The weft yarn is polyester filament, and the warp yarn is composed of polyester filament and bulletproof yarn with a tensile strength of not less than 25.9 cN / dtex. The twist of the polyester filament and bulletproof yarn is not less than 120 T·m-1. The fire hose is a 25-50-40 polyester filament-polyurethane fire hose manufactured according to GB6246.

[0015] As a further improvement, the overall cladding and connector are integrally formed by extrusion molding of polyether-type polyurethane plastic with a tensile strength of not less than 25 N / mm2 using a plastic extruder.

[0016] As a further improvement, the cable has a flat structure, and the plurality of cable conductors are arranged side by side.

[0017] A method for manufacturing a tethering device for a firefighting drone, characterized by comprising the following steps:

[0018] S1. A cable conductor is made by combining tin-plated copper-clad aluminum and copper foil wire;

[0019] S2. Mix the insulation material on an open mill according to the proportion, and use a continuous vulcanization pipe to evenly coat the cable conductor.

[0020] S3. The inner sheath material is mixed in a specified proportion on an open mill and the cable semi-finished product is made by hot air vulcanization.

[0021] S4. Using a fiber braiding machine, a braided tensile layer composed of bulletproof fibers is braided onto the surface of the cable semi-finished product;

[0022] S5. The outer sheath material is mixed on a two-roll mill according to the specified ratio and uniformly coated on the braided tensile layer using hot air vulcanization to prepare a cable.

[0023] S6. Using specified polyester filament and bulletproof yarn fibers, the yarn is spliced, twisted, and woven, and then the fabric layers are formed using a circular weaving machine through appropriate processes;

[0024] S7. The fabric layer and fire hose are preheated and then formed into a fire medium pipe through a one-time molding process using a plastic extruder.

[0025] S8. Using appropriate production processes, the prepared cable and fire-fighting medium pipe are extruded through a plastic extruder to form a sheath, connecting the cable and fire-fighting medium pipe into a whole to create a finished product.

[0026] As a further improvement, in step S8, 2-4 high-strength tear ropes need to be dragged into the appropriate position between the outer sheath and the overcoat of the cable.

[0027] A method for recovering a tethering device for a firefighting drone, characterized by comprising the following steps:

[0028] N1. By forcefully pulling the 2-4 high-strength tear ropes dragged in during step S8 above, the overlay covering the outer sheath of the cable can be peeled off, and the cable can be removed.

[0029] N2. Repeat steps S6, S7, and S8 to create a new reusable dual-medium transmission tethering device for firefighting drones.

[0030] Beneficial effects

[0031] The beneficial effects are as follows: This invention connects two independent components, the cable and the fire-fighting medium pipe, into a single unit through a unified sheath. Its structure is simple and highly practical. The fire-fighting medium pipe can use any standard fire hose of 2.5 MPa, 3.5 MPa, or 4.5 MPa. Its working pressure can meet the requirement of ensuring sufficient jetting power when water is delivered to a height of over 200 meters.

[0032] The fire-fighting medium pipe meets the standard pipe diameter requirements of GB6246 and can use standard fire hose interfaces, which is beneficial for the access of fire-fighting water and the replacement of corresponding accessories in an accident.

[0033] The warp of the fire-fighting medium pipe is made of polyester filament and bulletproof wire with a tensile strength of not less than 25.9cN / dtex. By adjusting the content of bulletproof wire in the warp, the burst load of the fire-fighting medium pipe can reach 1500-2500kg, which meets the tensile strength requirements of fire-fighting medium pipes used at heights of 200-400 meters under full load.

[0034] The cable in this invention can also adopt a flat structure, which corresponds to the flat structure that appears when the water or air in the fire medium pipe is vented, effectively reducing space occupation.

[0035] Considering the different service lives of fire-fighting medium pipes and cables, and adhering to the principle of saving energy and avoiding waste, high-strength tear ropes are installed in the overall sheathing layer. When the fire-fighting medium pipes can no longer meet the requirements, the cables can be quickly recycled and reprocessed into new products. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the cable conductor structure of the present invention.

[0039] Figure 3 This is a schematic diagram of the fabric layer portion of the present invention;

[0040] Figure 4 This is a schematic diagram of the circular cable structure of the present invention;

[0041] Figure 5 This is a schematic diagram of the flat cable structure of the present invention.

[0042] Number in the picture:

[0043] 1. Cable 11. Cable conductor 111. Copper foil wire 112. Tinned copper-clad aluminum wire 12. Insulation layer 13. Inner sheath 14. Outer sheath 15. Braided tensile layer 16. Communication optical fiber 17. Control unit 2. Fire-fighting medium pipe 21. Fire hose 22. Fabric layer 221. Polyester filament 222. Bulletproof wire 3. Overall sheath 4. Connector 5. High-strength tear rope Detailed Implementation

[0044] To provide a better understanding of the structural features and effects achieved by the present invention, a detailed description is provided below, accompanied by preferred embodiments and accompanying drawings:

[0045] like Figure 1 As shown, a tethering device for firefighting drones includes a cable 1 and a fire-fighting medium pipe 2. The cable 1 comprises several cable conductors 11, with an insulation layer 12 surrounding each conductor. An inner sheath 13 and an outer sheath 14 are also provided outside the insulation layer 12, with a braided tensile layer 15 located between the inner and outer sheaths. The fire-fighting medium pipe 2 consists of a fire hose 21 and a fabric layer 22. The cable 1 and the fire-fighting medium pipe 2 are arranged side-by-side and connected as a single unit via a sheath 3 and a connector 4. The cable 1 and the fire-fighting medium pipe 2, two independent entities, are combined into a complete device via the sheath 3 and the connector 4. This device has a simple structure, satisfies the pressure resistance requirement of the fire-fighting medium pipe, and overcomes the limitations of existing products. Both the cable and the fire-fighting medium pipe in this invention can use standard pipes and interfaces in fire protection systems.

[0046] Preferred, such as Figure 1 As shown, in order to quickly remove the overcoat 3 and achieve the function of rapid cable recycling, a high-strength tear rope 5 is provided between the outer sheath 14 and the overcoat 3.

[0047] Preferred, such as Figure 2As shown, to increase the tensile strength of the cable conductor and improve the overall service life of the cable, 5-7 copper foil wires 111 are set at the center of the cable conductor, with 7 copper foil wires being the most effective. The center of the copper foil wires 111 is a 500D bulletproof wire, and copper foil is spirally wrapped around the bulletproof wire to form the copper foil wires 111. Considering the payload of the UAV, several lightweight tin-plated copper-clad aluminum wires 112 are set on the outside of the copper foil wires 111 for transmitting electrical energy. To accommodate the frequent winding and bending of the cable, the diameter of the tin-plated copper-clad aluminum wires 112 is no greater than 0.15mm; at the same time, the bundle diameter ratio is no greater than 20 times during the manufacturing process, and the diameter ratio is no greater than 15 times during the twisting process. The braided tensile layer 15 is designed to provide tensile protection for cable 1 during long-distance use. Therefore, the braided tensile layer 15 is woven from bulletproof yarn fibers with a tensile strength of not less than 25.9 cN / dtex. The total burst load of the bulletproof yarn used in the braid is not less than 600 kg, meaning the total number of bulletproof yarns used in the braid is not less than 21,000 denier. When using a 16-spindle fiber braiding machine, each spindle should contain 1,500 denier bulletproof yarn fibers; when using a 24-spindle fiber braiding machine, each spindle should contain 1,000 denier bulletproof yarn fibers. To improve the actual effectiveness of the braided tensile layer, the braiding angle during production should not be less than 55°.

[0048] Preferred, such as Figure 3 As shown, fabric layer 22 is made of warp and weft yarns using a 2 / 1 twill circular weave. The weft yarn is polyester filament. Since the warp yarns also play a load-bearing role, they are composed of polyester filament 221 and bulletproof yarn 222 with a tensile strength of not less than 25.9 cN / dtex. Before circular weaving, the polyester filament 221 and bulletproof yarn 222 need to be twisted by a twisting machine, and the twist after twisting is not less than 120 T·m-1. Preferably, there are at least 28 strands of twisted 2500 denier bulletproof yarn in the warp yarns. This design can achieve a vertical burst load of 1500 kg. The fire hose 21 is a 25-50-40 polyester filament-polyurethane fire hose customized according to GB6246. Its working pressure can meet the requirement of ensuring sufficient jetting power when water is delivered to a height of 200 meters. It adopts a standard pipe diameter and can use standard fire hose interfaces, which is conducive to the access of fire-fighting water and the replacement of corresponding accessories in an accident.

[0049] Preferred, such as Figure 1 As shown, the sheathing layer 3 and the connector 4 are integrally formed by extrusion molding of polyether-type polyurethane plastic with a tensile strength of not less than 25 N / mm2 through a plastic extruder. The connector 4 plays the role of filling and connecting, and can fill the gaps between the sheathing layer 3, the cable conductor 11 and the cable conductor.

[0050] like Figure 1-3 As shown, a method for manufacturing a tethering device for a firefighting drone is characterized by comprising the following steps:

[0051] S1. The cable conductor is made by combining tin-plated copper-clad aluminum and copper foil wire. In order to increase the tensile strength of the cable conductor and improve the overall service life of the cable, seven copper foil wires 111 are set at the center of the cable conductor. The center of the copper foil wire is a 500D bulletproof wire. Copper foil is spirally wrapped around the bulletproof wire. Considering the load factor of the UAV, a lightweight tin-plated copper-clad aluminum wire 112 is set outside the copper foil wire 111 to transmit electrical energy. In order to adapt to the frequent winding and bending of the cable, the diameter of the tin-plated copper-clad aluminum wire 102 is no more than 0.15mm. At the same time, the bundle diameter ratio is no more than 20 times during the manufacturing process and the twisting diameter ratio is no more than 15 times during the re-twisting process.

[0052] S2. The insulation material is mixed on a two-roll mill according to the specified proportions, and then uniformly coated onto the cable conductor using a continuous vulcanizing pipe. The insulation layer uses a silicone rubber mixture, which includes at least the following components: 45%-54% vinyl raw rubber, 15%-18% high-vinyl raw rubber, 2%-4% structure control agent (hydroxyl silicone oil), 2%-4% tailing agent (HMDZ), 15%-18% reinforcing agent (high specific surface area silica), and 1%-2% vulcanizing agent. The vulcanizing agent is 45% 2,5-dimethyl-2,5-diperoxytert-butylhexane. The above materials are mixed on a two-roll mill. The mixing process begins with adding raw rubber, followed by structure control agent, tailing agent, and reinforcing agent in sequence. Finally, vulcanizing agent is added. The mixing time after adding vulcanizing agent should not exceed 3 minutes, and the rolling temperature of the open mill should not exceed 50°C. After the sheets are removed and left to stand for 24 hours, the next production step can be carried out. The insulation layer needs to be produced using continuous steam vulcanization. The average thickness of the insulation should not be less than 2.0mm, which can meet the power supply requirements of DC 500V drone engines on the market. After the insulation layer is produced, it needs to be placed in a 130°C oven for 4 hours to remove the moisture in the insulation layer before the next production step can be carried out.

[0053] S3. The inner sheath material is mixed in a specified proportion on an open mill and the cable semi-finished product is made by hot air vulcanization. The inner sheath material is a high mechanical strength silicone rubber mixture, which includes at least the following components and parts by weight: 40%-44% vinyl raw rubber, 10%-17% high vinyl raw rubber, 5%-8% high molecular weight raw rubber, 2%-4% structure control agent (hydroxyl silicone oil), 2%-4% tailing agent (HMDZ), 15%-21% reinforcing agent (high specific surface area silica), and 1%-2% vulcanizing agent. The vulcanizing agent is bis(2,4-dichlorobenzoyl) peroxide (50%). The mixing method is the same as that of the above insulation layer.

[0054] S4. Using a fiber braiding machine, a braided tensile layer composed of bulletproof wire fibers is braided onto the surface of the semi-finished cable. The total burst load of the bulletproof wire used for braiding shall not be less than 600 kg, that is, the total number of bulletproof wires used for braiding shall not be less than 21,000 denier. When using a 16-spindle fiber braiding machine, each spindle of bulletproof wire should have 1,500 denier, and when using a 24-spindle fiber braiding machine, each spindle of bulletproof wire should have 1,000 denier. In order to improve the actual effect of the braided tensile layer, the braiding angle shall not be less than 55° during the braiding production.

[0055] S5. The outer sheath material is mixed on an open mill according to the specified ratio and uniformly coated on the braided tensile layer using hot air vulcanization to prepare a cable; the outer sheath material is a high mechanical strength silicone rubber mixture, which includes at least the following components and weight parts: 40%-44% vinyl raw rubber, 10%-17% high vinyl raw rubber, 5%-8% high molecular weight raw rubber, 2%-4% structure control agent (hydroxyl silicone oil), 2%-4% tailing agent (HMDZ), 15%-21% reinforcing agent (high specific surface area silica), 1%-2% vulcanizing agent, the vulcanizing agent is bis(2,4-dichlorobenzoyl) peroxide (50%), and the mixing method is the same as that of the above insulation layer;

[0056] S6. Using specified polyester filament and bulletproof yarn fibers, the yarns are spliced, twisted, and woven. A circular weaving machine is used to create the fabric layer using a suitable process. The warp and weft yarns are circularly woven in a 2 / 1 twill pattern to form a customized fabric layer. The weft yarns use polyester filament. Because the warp yarns also play a load-bearing role, they are composed of polyester filament and bulletproof yarn with a tensile strength of not less than 25.9 cN / dtex. Before circular weaving, the polyester filament and bulletproof yarn need to be twisted using a pre-twisting machine, and the twist after twisting is not less than 120 T·m⁻¹. Preferably, the warp yarns contain at least 28 strands of twisted 2500 denier bulletproof yarn. This design can achieve a vertical burst load of 1500 kg.

[0057] S7. After preheating, the fabric layer and fire hose are formed into a fire medium pipe through a one-time molding process using a plastic extruder. The fire hose uses polyether-type polyurethane plastic with a tensile strength of not less than 25 N / mm2. Before production, the polyurethane plastic particles need to be dried in a drying oven at 90°C for 12 hours. During production, the preheating temperature of the fabric layer is 95°C. The temperature of the polyurethane extruder is set to increase from 165°C to 220°C from the first zone to the die head. Pressurized production is used to ensure a tight bond between the fire hose and the fabric layer.

[0058] S8. Using appropriate production processes, the prepared cable and fire-fighting medium pipe are extruded through a plastic extruder to form a sheath layer, connecting the cable and the fire-fighting medium pipe into a whole to make a finished product. The sheath layer and the connector are made of polyether-type polyurethane plastic with a tensile strength of not less than 25 N / mm2. Before production, the polyurethane plastic particles need to be dried in a drying oven at 90°C for 12 hours. During production, the fire-fighting medium pipe needs to be preheated at 95°C. The temperature of the polyurethane extruder is set to increase from 165°C to 220°C from the first zone to the die head. To ensure a tight bond between the sheath layer and the fabric layer, pressure production is required. At the same time, dimethyl silicone oil needs to be coated on the surface of the cable outer sheath 5 for isolation.

[0059] Preferably, in step S8, 2-4 high-strength tear ropes need to be dragged into a suitable position between the outer sheath and the overall sheath of the cable to facilitate the cable's handling during recycling.

[0060] A method for recovering a tethering device for a firefighting drone, characterized by comprising the following steps:

[0061] N1. By forcefully pulling the 2-4 high-strength tear ropes dragged in during step S8 above, the overlay covering the outer sheath of the cable can be peeled off, and the cable can be removed.

[0062] N2. Repeat steps S6, S7, and S8 to create a new reusable dual-medium transmission tethering device for firefighting drones.

[0063] Example 1

[0064] like Figure 1 As shown, a tethering device for firefighting drones includes a cable 1 and a fire-fighting medium pipe 2. The cable 1 comprises three cable conductors 11 arranged in a ring. An insulation layer 12 is provided outside the cable conductors 11. An inner sheath 13 and an outer sheath 14 are provided outside the insulation layer 12. A braided tensile layer 15 is provided between the inner sheath 13 and the outer sheath 14. The fire-fighting medium pipe 2 is composed of a fire hose 21 and a fabric layer 22. The cable 1 and the fire-fighting medium pipe 2 are arranged side by side and connected as a whole by an overlay layer 3 and a connector 4. The tethering device obtained by this embodiment has a significant advantage in terms of flexibility, but it also has the disadvantage of occupying a relatively large space when stored.

[0065] Example 2

[0066] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the cable 1 has a flat structure, with four cable conductors 11 and one communication optical fiber 16 arranged in parallel. The cable adopts a flat structure, which corresponds to the flat structure that appears when the water or air in the fire medium pipe is emptied, and can effectively reduce space occupation when stored.

[0067] Example 3

[0068] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that, as needed, a communication optical fiber 16 and a control unit can also be installed inside cable 1. This improves the versatility of the device in actual use and better meets market demands.

[0069] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations and modifications made in accordance with the shape, structure, features and spirit described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A tethering device for firefighting drones, comprising a cable and a fire-fighting medium pipe, characterized in that, The cable comprises several cable conductors, with an insulation layer surrounding each conductor. An inner sheath and an outer sheath are also provided outside the insulation layer. A braided tensile layer is located between the inner and outer sheaths. The fire-fighting medium pipe consists of a fire hose and a fabric layer. The cable and the fire-fighting medium pipe are arranged side-by-side and connected as a single unit via a sheath and a connector. Five to seven copper foil wires are positioned at the center of each cable conductor. The core of each copper foil wire is a 500D bulletproof wire, and copper foil is spirally wound around the bulletproof wire to form the copper... The foil wire has several lightweight tin-plated copper-clad aluminum wires on its outer side for transmitting electrical energy. The diameter of the tin-plated copper-clad aluminum wires is no greater than 0.15 mm, and the bundle diameter ratio is no greater than 20 times during manufacturing and no greater than 15 times during the re-twisting process. The braided tensile layer is made of bulletproof yarn with a tensile strength of no less than 25.9 cN / dtex. The total burst load of the bulletproof yarn used for braiding is no less than 600 kg, that is, the total number of bulletproof yarns used for braiding is no less than 21,000 deniers. The braiding angle should not be less than 55° during the braiding production.

2. The tethering device for a firefighting drone according to claim 1, characterized in that, A high-strength tear cord is provided between the outer sheath and the overall sheath.

3. The tethering device for a firefighting drone according to claim 1, characterized in that, The cable also includes communication optical fibers and a control unit.

4. The tethering device for a firefighting drone according to claim 1, characterized in that, The fabric layer is made of warp and weft yarns using a 2 / 1 twill circular weave. The weft yarn is polyester filament, and the warp yarn is composed of polyester filament and bulletproof yarn with a tensile strength of not less than 25.9 cN / dtex. The twist of the polyester filament and bulletproof yarn is not less than 120 T•m-1. The fire hose is a 25-50-40 polyester filament-polyurethane fire hose manufactured according to GB6246.

5. A tethering device for a firefighting drone according to claim 1, characterized in that, The overall cladding and connector are integrally formed by extruding polyether-type polyurethane plastic with a tensile strength of not less than 25 N / mm2 using a plastic extruder.

6. The tethering device for a firefighting drone according to claim 1, characterized in that, The cable has a flat structure, and the plurality of cable conductors are arranged side by side.

7. The method for manufacturing a tethering device for a firefighting drone according to claim 1, characterized in that, Includes the following steps: S1. A cable conductor is made by combining tin-plated copper-clad aluminum and copper foil wire; S2. Mix the insulation material on an open mill according to the proportion, and use a continuous vulcanization pipe to evenly coat the cable conductor. S3. The inner sheath material is mixed in a specified proportion on an open mill and the cable semi-finished product is made by hot air vulcanization. S4. Using a fiber braiding machine, a braided tensile layer composed of bulletproof fibers is braided onto the surface of the cable semi-finished product; S5. The outer sheath material is mixed on a two-roll mill according to the specified ratio and uniformly coated on the braided tensile layer using hot air vulcanization to prepare a cable. S6. Using specified polyester filament and bulletproof yarn fibers, the yarn is spliced, twisted, and woven, and then the fabric layers are formed using a circular weaving machine through appropriate processes; S7. The fabric layer and fire hose are preheated and then formed into a fire medium pipe through a one-time molding process using a plastic extruder. S8. Using appropriate production processes, the prepared cable and fire-fighting medium pipe are extruded through a plastic extruder to form a sheath, connecting the cable and fire-fighting medium pipe into a whole to create a finished product.

8. A method for manufacturing a tethering device for a firefighting drone according to claim 7, characterized in that, In step S8, 2-4 high-strength tear ropes need to be dragged into the appropriate position between the outer sheath and the overcoat of the cable.

9. A method for recovering a tethered device for a firefighting drone according to claim 8, characterized in that, Includes the following steps: N1. By forcefully pulling the 2-4 high-strength tear ropes dragged in during step S8, the overlay covering the cable's outer sheath can be peeled off, and the cable can be removed. N2. Repeating steps S6, S7, and S8 will produce a new reusable dual-medium transmission firefighting drone tethering device.

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