Manufacturing equipment and method of cold-resistant low-smoke flame-retardant comprehensive airtight explosion-proof cable and the cable

Abstract

This invention discloses a manufacturing equipment, method, and cable for a cold-resistant, low-smoke, flame-retardant, airtight, and explosion-proof integrated cable, relating to the field of cable technology. The cable includes a frame stranding machine equipped with a glue-filling and sealing assembly, which includes a follower tube. The follower tube is installed through the middle of one end of the frame stranding machine, and a first guide wheel is evenly installed on the outer side of the follower tube away from the frame stranding machine. An annular conveying pipe is installed on the follower tube. In this invention, electronic silicone is extruded and filled into the gaps between the stranded conductors. Through extrusion, the stranded conductor structure becomes more compact. Each layer of the conductor is filled with electronic silicone. The mechanical force during the stranding process allows the silicone to fully penetrate all the tiny gaps. Combined with subsequent processes, this effectively solves the problem of medium conduction hazards in conventional cables in explosion-prone areas, contributing to the improvement of industry safety production standards and ensuring energy development in extreme environments.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a manufacturing equipment, method, and cable for a cold-resistant, low-smoke, flame-retardant, airtight, and explosion-proof integrated cable. Background Technology

[0002] Extremely stringent technical requirements are imposed on electrical equipment, especially cable products, used in explosive atmospheres. Cables installed in areas with explosion hazards must have continuous longitudinal sealing performance to limit the movement and propagation of combustibles along the cable. The core purpose of this technical requirement is to effectively block the diffusion path of combustible media (such as flammable and explosive gases, vapors or dust) along the axial gap of the cable by setting a continuous sealing barrier in the cable structure, fundamentally eliminating the risk of cross-area explosion chain caused by cable penetration, and upgrading the cable from a "power / signal transmission carrier" to an "explosion-proof safety barrier". It is necessary to solve the engineering contradiction between structural integrity and media isolation while meeting electrical performance requirements, which poses a stringent composite technical challenge to cable material selection, structural design and manufacturing process. Currently, the cable manufacturing industry has a significant technological gap in the field of specialized cables for explosion-hazardous areas. Conventional cables generally have "hidden gas channels" because they lack a systematic design for longitudinal sealing. Under the influence of external environmental pressure differences (such as pressure fluctuations caused by the start-up and shutdown of process equipment and temperature changes), flammable and explosive media can slowly migrate from the danger zone to the safe zone along these channels. Over time, this can accumulate to form local concentrations exceeding the limits, which can easily lead to disasters after exceeding the explosion limits, seriously threatening the production safety and personnel life protection of oil and gas chemical enterprises. Summary of the Invention

[0003] This invention provides a manufacturing equipment, method, and cable for a cold-resistant, low-smoke, flame-retardant, airtight, and explosion-proof cable. It can effectively solve the problem mentioned in the background art that conventional cables generally have "hidden gas channels" due to the lack of systematic design for longitudinal sealing. Flammable and explosive media can slowly migrate from the danger zone to the safe zone along these channels, accumulating over time to form local concentrations exceeding the standard, which can easily cause disasters after exceeding the explosion limit.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight, and explosion-proof cable, comprising a frame stranding machine, wherein the frame stranding machine is equipped with a glue-filling and sealing assembly, and the glue-filling and sealing assembly comprises a follower tube; A follower tube is installed through the middle of one end of the frame stranding machine. A first guide wheel is evenly installed on the outer side of the follower tube away from the frame stranding machine. An annular conveying pipe is installed on the follower tube. An annular feed sleeve is rotatably sleeved on one end of the annular conveying pipe. An annular discharge pipe is installed on the other end of the annular conveying pipe through a thread. A guide pipe is evenly welded through the outer side of the annular feed sleeve. A protective sleeve is sleeved on the outer side of the annular discharge pipe. A second guide wheel is installed on the outer side of the protective sleeve corresponding to the guide pipe. A storage groove is opened in the middle of the second guide wheel. A wire-bundling platform is provided on one side of the sheath tube. A mold groove is provided at the top of the wire-bundling platform. A stranding mold is embedded in the mold groove. An adjustment hole is provided in the middle of the stranding mold. An entry hole is provided on one side of the inner wall of the adjustment hole. A pull-out hole is provided on one side of the inner wall of the adjustment hole.

[0005] According to the above technical solution, a top adjusting plate is movably snapped onto the top of the adjusting hole, a top pressing block is connected to the bottom surface of the top adjusting plate via a connecting spring, a bottom adjusting plate is movably snapped onto the bottom of the adjusting hole, and a bottom pressing block is connected to the top of the bottom adjusting plate via a connecting spring. An electric actuator is installed through the center of the top surface of the filament bundling platform. A pressure sensor is embedded in the center of the top surface of the top pressure block corresponding to the protruding end of the electric actuator. Leakage holes are evenly distributed in the center of the bottom pressure block. A connecting hole is formed in the center of the bottom surface of the bottom adjustment plate. A leakage channel is formed in the center of the bottom end of the mold groove. A negative pressure pump is embedded in one side of the filament bundling platform. An inclined baffle is welded at the top of the leakage channel of the negative pressure pump. A collection box is installed at the bottom end of the filament bundling platform. A pressure plate pump is connected to one end of the annular feed sleeve.

[0006] According to the above technical solution, the diameter of the inlet hole is larger than the diameter of the pull-out hole. The inner sides of the top pressure block and the bottom pressure block are provided with guide grooves. After the guide grooves of the top pressure block and the bottom pressure block are spliced ​​together, they form a frustum-shaped through hole with one end larger and the other end smaller. The larger diameter end of the frustum-shaped through hole is the same as the diameter of the inlet hole, and the smaller diameter end of the frustum-shaped through hole is the same as the diameter of the pull-out hole.

[0007] According to the above technical solution, a limiting end ring is fixedly sleeved at one end of the annular feed sleeve near the annular discharge pipe. A sealing gasket is embedded on the side of the limiting end ring near the annular discharge pipe. A smooth groove is opened in the middle of the first guide wheel and the second guide wheel. The top of the guide tube is attached to the inner side of the second guide wheel.

[0008] According to the above technical solution, the output terminal of the pressure sensor is electrically connected to the input terminal of the external controller, the output terminal of the external controller is electrically connected to the input terminals of the electric actuator, the negative pressure pump and the pressure plate pump respectively, and the input terminal of the external controller is electrically connected to the output terminal of the external power supply.

[0009] According to the above technical solution, a cooling and anti-scratch assembly is provided on one side of the frame winch, and the cooling and anti-scratch assembly includes an annular guide box; A ring-shaped guide box is fixedly installed on one side of the frame winch. Slag leakage holes are evenly distributed on the outer side of the ring-shaped guide box. A ring-shaped adhesive box is installed on one side of the ring-shaped guide box. Air jet holes are evenly distributed on the outer side of the ring-shaped adhesive box. An end-sealing ring is embedded on the outer side of the ring-shaped adhesive box. A wire-passing hole is provided in the middle of the ring-shaped guide box, the ring-shaped adhesive box, and the end-sealing ring. Smooth guide wheels are symmetrically installed on the ring-shaped guide box near the wire-passing hole. Adhesive guide wheels are symmetrically installed on the ring-shaped adhesive box near the wire-passing hole. A leak-proof rubber ring is embedded inside the wire-passing hole. A leak-proof sponge is bonded inside the leak-proof rubber ring. A narrow wire-passing hole is provided in the middle of the leak-proof sponge.

[0010] According to the above technical solution, the annular guide box and the annular adhesive box are rotatably installed on the inner side of the fixed outer ring. Both ends of the fixed outer ring are glued with edge rubber rings. A dust collection box is installed through and snapped on the bottom end of the fixed outer ring near the annular guide box. A cooling box is installed through and snapped on the bottom end of the fixed outer ring near the annular adhesive box. Both the dust collection box and the cooling box have ventilation pipes installed through one side. A diversion box is welded to one end of the ventilation pipe inside the dust collection box and the cooling box. Diversion holes are evenly opened at the bottom of the diversion box. A vacuum pump is installed at the other end of the ventilation pipe of the dust collection box, and a liquid nitrogen pump is installed at the other end of the ventilation pipe of the cooling box.

[0011] According to the above technical solution, the outer side of the adhesive guide wheel is uniformly provided with an embedding groove, the end sealing ring is provided with a replenishment hole, a replenishment plug is installed inside the replenishment hole by a thread, and talcum powder is placed at the bottom of the annular adhesive box. The input terminals of the vacuum pump and liquid nitrogen pump are electrically connected to the output terminal of the external controller, respectively.

[0012] According to the above technical solution, a method for manufacturing a cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable, utilizing a manufacturing equipment for such cables, includes the following steps: S1: Conductor process, using high-strength tungsten steel mold, the mold opening adopts polycrystalline coating process, the conductor single wire is uniformly deformed, the conductor shape is round or fan-shaped, the conductor single wire is in the frame stranding machine, the conductor single wire passes through the cooling and anti-scratch component, and then the glue filling and sealing component is used for glue injection, the glue penetrates into the tiny gaps between the conductor single wires. S2: Insulation process, when the stranded conductor is filled with the outer insulation layer, the mold flow channel adopts a "gradual contraction plus local pressure increase" structure, and the air in the inner insulation layer is emptied by an online vacuum exhaust device; S3: Twisting process of wire group. Instrument and computer cables add a twisting process of wire group, and use airtight filling polymer to densely fill the gaps in the insulation edge of the wire group. S4: Copper wire shielding process, which is a composite process of loosely winding multiple fine copper wires and extruding and filling with semi-conductive material. It uses copper wires with a finer diameter to reduce the porosity between individual wires. S5: Cable forming process, center filling and structural fixing combination process, which uses a customized extrusion device to compact it and fill the central gap of the cable core; S6: Inner sheath process, different sealing processes are adopted according to specifications, and the inner sheath completely seals the outer edge of the cable core; S7: Armoring process. When the steel strip is armored, it is a double layer of steel strip with gaps wrapped around it. The spiral channel is airtightly sealed by wrapping tape inside and outside. When the steel wire is armored, the glue injection mold is used to fill the gaps between the steel wires and the upper and lower layers by twisting and rotating with the steel wire. S8: In the outer sheath process, a semi-extrusion die is used to completely remove the air between the machine head and the cable core, so that the outer sheath and the inner structure are seamlessly bonded.

[0013] According to the above technical solution, a cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable is provided, and the explosion-proof cable is manufactured according to the manufacturing method of the cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. A filling and sealing assembly is provided. The conductor monofilament is guided into the stranding die by the first guide wheel and the second guide wheel. The electronic silicone enters the storage groove of the second guide wheel through the guide tube of the annular discharge tube and applies the electronic silicone to the inner side of the conductor monofilament. Applying electronic silicone while guiding the conductor monofilament facilitates subsequent stranding processing. When the conductor wires enter the entry hole of the stranding die for stranding, the electronic silicone is squeezed and filled into the gaps between the stranded conductors. After squeezing, the stranded conductor structure becomes more compact. The pressure is monitored by a pressure sensor. When the pressure is low, the electric push rod is activated to press down, the connecting spring contracts and rebounds, and the stranded conductors are continuously squeezed. The negative pressure pump is activated, and the excess electronic silicone falls under the action of gravity and negative pressure. It passes through the glue leakage hole and the connecting hole, and enters the collection box along the glue leakage channel. This reduces the amount of electronic silicone on the outside of the stranded wires, which facilitates subsequent wiring and reduces waste. The glue injection system consists of a pressure plate pump, a high-flow glue outlet valve, a high-pressure resistant pipeline, and a quantitative controller. It is linked with the conductor stranding equipment through electrical signals to ensure that the glue fills the gaps in real time during the monofilament stranding process. Each layer of the conductor is filled with electronic silicone. The mechanical force during the stranding process allows the glue to fully penetrate into all the tiny gaps. The conductor is finally formed into a circular or fan-shaped cross section by the stranding mold or shaped pressure roller.

[0015] 2. Equipped with a cooling and anti-scratch component, liquid nitrogen is intermittently pumped in by the liquid nitrogen pump. It passes through the vent pipe and the distribution box, and is dispersed into the talc powder inside the cooling box through the distribution hole. It will quickly turn into gas and expand rapidly. It flows along the gaps between the talc powder and pushes up some of the talc powder, causing some of the talc powder to diffuse into the annular adhesion box. The rotating conductor wire and the adhesion guide wheel pass through the diffused talc powder. After the conductor wire passes through the smooth guide wheel and the adhesion guide wheel, it will also adhere the talc powder to the outside of the conductor wire again. When the conductor wire passes through the wire-passing narrow hole of the leak-proof sponge, the excess talc powder is scraped off, so that the talc powder is distributed in a small amount and evenly on the outside of the conductor wire. Because liquid nitrogen absorbs a lot of heat and cools down when it turns into gas, it reduces the problem of plastic deformation caused by excessive friction when the conductor wires are twisted together. It also reduces the problem of the conductor wires losing strength due to rising temperature, and further reduces the deformation when the conductor wires are twisted together. The vacuum pump reduces the air pressure inside the annular guide box, causing a small amount of air and nitrogen to be ejected from the wire-passing slits of the leak-proof sponge. This ejects the dust adhering to the outside of the conductor wire that is about to enter the wire-passing slits. Meanwhile, a small amount of leaked talcum powder and dust fall under the influence of gravity and pass through the slag hole into the dust collection box, cleaning the surface of the conductor wire and reducing the probability of the conductor wire being scratched by debris. In summary, during the stranding process, the cooling and anti-scratch components, along with the lubrication of talc powder, reduce the deformation of the conductor filaments during the stranding process of the filling and sealing components, thereby improving the overall strength of the cable. Furthermore, the low temperature also slows down the curing speed of the electronic silicone in the filling and sealing components, allowing the electronic silicone to fill the gaps more fully and reduce the conductor gaps. Through the above-mentioned compression and injection composite process, a highly flexible, highly conductive, and moisture-proof airtight conductor has been developed, which can be combined with subsequent processes. This will effectively solve the problem of medium conduction hazards in conventional cables in explosion-prone areas, providing oil and gas chemical companies with a three-in-one cable solution that integrates "safety barrier, environmental adaptability, and electrical reliability," and helping to improve industry safety production standards and ensure energy development in extreme environments. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the method flow of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the glue-filling and sealing assembly of the present invention; Figure 4This is a schematic diagram of the installation structure of the second guide wheel of the present invention; Figure 5 This is a schematic diagram of the installation structure of the stranding mold of the present invention; Figure 6 This is a schematic diagram of the installation structure of the top adjustment plate of the present invention; Figure 7 This is a schematic diagram of the cooling and scratch-resistant component of the present invention; Figure 8 This is the present invention. Figure 7 A schematic diagram of the structure of region A; Figure 9 This is a schematic diagram of the installation structure of the annular adhesive box of the present invention; Figure 10 This is the present invention. Figure 9 A schematic diagram of the structure of region B; Figure 11 This is a schematic diagram of the cable structure of the present invention; Labels in the diagram: 1. Frame stranding machine; 2. Glue-filling and sealing assembly; 201. Follower tube; 202. First guide wheel; 203. Annular conveying pipe; 204. Annular feed sleeve; 205. Annular discharge pipe; 206. Limiting end ring; 207. Guide tube; 208. Sheath tube; 209. Second guide wheel; 210. Storage trough; 211. Wire bundling table; 212. Mold groove; 213. Stranding mold; 214. Adjustment hole; 215. Inlet hole; 216. Pull-out hole; 217. Top adjusting plate; 218. Connecting spring; 219. Top pressure block; 220. Bottom adjusting plate; 221. Bottom pressure block; 222. Electric actuator; 223. Pressure sensor; 224. Glue leakage hole; 225. Connecting hole; 226. Glue leakage channel; 227. Negative pressure pump; 228. Inclined baffle; 229. Collection box; 230. Pressure plate pump; 3. Cooling and anti-scratch components; 301. Annular guide box; 302. Slag leakage hole; 303. Annular adhesion box; 304. Air jet hole; 305. End sealing ring; 306. Wire hole; 307. Smooth guide wheel; 308. Adhesion guide wheel; 309. Embedded groove; 310. Replenishment hole; 311. Replenishment plug; 312. Leak-proof rubber ring; 313. Leak-proof sponge; 314. Wire hole; 315. Fixing outer ring; 316. Edge rubber ring; 317. Dust collection box; 318. Cooling box; 319. Vent pipe; 320. Diversion box; 321. Diversion hole; 322. Vacuum pump; 323. Liquid nitrogen pump; 4. Explosion-proof cable. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example: Figure 1 As shown, the present invention provides a method for manufacturing a cold-resistant, low-smoke, flame-retardant, airtight, explosion-proof cable, comprising the following steps: S1: Conductor process, using high-strength tungsten steel mold, the mold cavity opening is a streamlined flared structure, the mold opening adopts polycrystalline coating process, the conductor single wire is uniformly deformed, the conductor shape is round or fan-shaped, the conductor single wire is in frame stranding machine 1, after the frame stranding machine 1 rotates, the conductor single wire passes through cooling and anti-scratch component 3, and then glue is injected by filling and sealing component 2, the glue penetrates into the tiny gaps between conductor single wires, the conductor finally forms a round or fan-shaped cross section through stranding mold or special shape pressure roller; S2: Insulation process, when the stranded conductor is filled with the outer insulation layer, the mold flow channel adopts a "gradual contraction plus local pressure increase" structure, and the air in the inner insulation layer is emptied by an online vacuum exhaust device; S3: Twisting process of wire groups. In view of the characteristics of the multi-wire group structure of instrument and computer cables, a twisting process of wire groups is added. The gaps of the insulation edge seams inside the wire group are filled with airtight filling polymer. S4: Copper wire shielding process. When adding the shielding layer, a composite process of loosely winding multiple fine copper wires and extruding and filling with semi-conductive material is used. Copper wires with a finer diameter are used to reduce the porosity between individual wires. S5: Cable forming process, center filling and structural fixing combination process, which uses a customized extrusion device to compact it and fill the central gap of the cable core; S6: Inner sheath process. In view of the characteristic that the area of ​​the outer edge seam of the cable core varies with the specification, a differentiated sealing process is adopted according to the specification. The inner sheath completely seals the outer edge of the cable core. S7: Armoring process. The steel strip armor layer is a double-layer steel strip with a gap wrapping method. Both the inner and outer layers have spiral channels with wrapping gaps. The wrapping tape needs to airtightly seal the spiral channels inside and outside. The steel wire armor uses low-viscosity armoring electronic silicone. The silicone is filled between the steel wires and between the upper and lower layers by the injection mold as the steel wires are twisted and rotated. S8: In the outer sheath process, a semi-extrusion mold is used in conjunction with a vacuum device to completely remove the air between the machine head and the cable core. Low fire hazard polyvinyl chloride or low smoke halogen-free polyolefin is used to ensure seamless bonding between the outer sheath and the inner structure.

[0020] like Figure 2-10As shown, a manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight, explosion-proof cable includes a frame stranding machine 1. The frame stranding machine 1 is equipped with a glue-filling and sealing assembly 2. The glue-filling and sealing assembly 2 includes a follower tube 201, a first guide wheel 202, an annular conveying pipe 203, an annular feeding sleeve 204, an annular discharging pipe 205, a limiting end ring 206, a guiding pipe 207, a sheath tube 208, a second guide wheel 209, a storage trough 210, and a wire bundling table 2. 11. Mold groove 212. Stranded wire mold 213. Adjustment hole 214. Inlet hole 215. Pull-out hole 216. Top adjustment plate 217. Connecting spring 218. Top pressure block 219. Bottom adjustment plate 220. Bottom pressure block 221. Electric push rod 222. Pressure sensor 223. Glue leakage hole 224. Connecting hole 225. Glue leakage channel 226. Negative pressure pump 227. Inclined baffle 228. Collection box 229. and pressure plate pump 230; A follower pipe 201 is installed through the middle of one end of the frame stranding machine 1. First guide wheels 202 are evenly installed on the outer side of the follower pipe 201 away from the frame stranding machine 1. An annular conveying pipe 203 is installed on the follower pipe 201. An annular feed sleeve 204 is rotatably sleeved at one end of the annular conveying pipe 203. An annular discharge pipe 205 is threaded onto the other end of the annular feed sleeve 204. Guide pipes 207 are evenly welded through the outer side of the annular feed sleeve 204. A protective sleeve 208 is sleeved on the outer side of the annular discharge pipe 205. A second guide wheel 209 is installed on the outer side corresponding to the guide tube 207. A limit end ring 206 is fixedly sleeved on one end of the annular feed sleeve 204 near the annular discharge tube 205. A sealing gasket is embedded on the side of the limit end ring 206 near the annular discharge tube 205. A smooth groove is opened in the middle of the first guide wheel 202 and the second guide wheel 209. The top of the guide tube 207 is attached to the inner side of the second guide wheel 209 to prevent leakage of electronic silicone and facilitate the guidance of conductor single wire. A storage groove 210 is opened in the middle of the second guide wheel 209. A wire-bundling platform 211 is provided on one side of the sheath tube 208. A mold groove 212 is provided at the top of the wire-bundling platform 211. A stranding mold 213 is embedded in the mold groove 212. An adjustment hole 214 is provided in the middle of the stranding mold 213. An inlet hole 215 is provided on one side of the inner wall of the adjustment hole 214. A pull-out hole 216 is provided on one side of the inner wall of the adjustment hole 214. A top adjustment plate 217 is movably snapped onto the top of the adjustment hole 214. A top pressure block 219 is connected to the bottom surface of the top adjustment plate 217 through a connecting spring 218. A top pressure block 219 is movably snapped onto the bottom of the adjustment hole 214. The device is equipped with a bottom adjusting plate 220. The top of the bottom adjusting plate 220 is connected to a bottom pressure block 221 via a connecting spring 218. The diameter of the inlet hole 215 is larger than the diameter of the pull-out hole 216. Guide grooves are provided on the inner sides of both the top pressure block 219 and the bottom pressure block 221. After the guide grooves of the top pressure block 219 and the bottom pressure block 221 are spliced ​​together, they form a frustum-shaped through hole with one end larger than the other. The larger diameter end of the frustum-shaped through hole is the same as the diameter of the inlet hole 215, and the smaller diameter end of the frustum-shaped through hole is the same as the diameter of the pull-out hole 216, which improves the forming effect after the conductor monofilament is stranded. An electric actuator 222 is installed through the center of the top surface of the filament-binding table 211. A pressure sensor 223 is embedded in the center of the top surface of the top pressure block 219 corresponding to the protruding end of the electric actuator 222. Leakage holes 224 are evenly distributed in the center of the bottom pressure block 221. A connecting hole 225 is opened in the center of the bottom surface of the bottom adjustment plate 220. A leakage channel 226 is opened in the center of the bottom end of the mold groove 212. A negative pressure pump 227 is embedded in one side of the filament-binding table 211. An inclined baffle is welded at the top of the negative pressure pump 227 in the leakage channel 226. A collection box 229 is installed at the bottom of the plate 228 and the wire-bundling table 211. One end of the annular feed sleeve 204 is connected to the pressure plate pump 230. The output end of the pressure sensor 223 is electrically connected to the input end of the external controller. The output end of the external controller is electrically connected to the input ends of the electric push rod 222, the negative pressure pump 227 and the pressure plate pump 230 respectively. The input end of the external controller is electrically connected to the output end of the external power supply to ensure that the pressure sensor 223, the electric push rod 222, the negative pressure pump 227 and the pressure plate pump 230 work normally.

[0021] A cooling and anti-scratching assembly 3 is provided on one side of the frame winch 1. The cooling and anti-scratching assembly 3 includes an annular guide box 301, a slag leakage hole 302, an annular adhesion box 303, an air jet hole 304, an end sealing ring 305, a wire threading hole 306, a smooth guide wheel 307, an adhesion guide wheel 308, an embedded groove 309, a replenishment hole 310, a replenishment plug 311, an anti-leakage rubber ring 312, an anti-leakage sponge 313, a wire threading narrow hole 314, a fixing outer ring 315, an edge rubber ring 316, a dust collection box 317, a cooling box 318, a vent pipe 319, a diversion box 320, a diversion hole 321, a vacuum pump 322, and a liquid nitrogen pump 323. A ring-shaped guide box 301 is fixedly installed on one side of the frame winch 1. Slag leakage holes 302 are evenly distributed on the outer side of the ring-shaped guide box 301. A ring-shaped adhesion box 303 is installed on one side of the ring-shaped guide box 301. Air jet holes 304 are evenly distributed on the outer side of the ring-shaped adhesion box 303. An end sealing ring 305 is embedded on the outer side of the ring-shaped adhesion box 303. A wire threading hole 306 is opened in the middle of the ring-shaped guide box 301, the ring-shaped adhesion box 303, and the end sealing ring 305. A wire threading hole 306 is located near the wire threading hole 306 on the ring-shaped guide box 301. A smooth guide wheel 307 is symmetrically installed. An adhesive guide wheel 308 is symmetrically installed near the wire hole 306 in the annular adhesive box 303. An embedded groove 309 is evenly opened on the outer side of the adhesive guide wheel 308. A supplementary hole 310 is opened in the end sealing ring 305. A supplementary plug 311 is installed inside the supplementary hole 310 by thread. A leak-proof rubber ring 312 is embedded inside the wire hole 306. A leak-proof sponge 313 is bonded inside the leak-proof rubber ring 312. A wire-passing narrow hole 314 is opened in the middle of the leak-proof sponge 313. Both the annular guide box 301 and the annular adhesive box 303 are rotatably mounted inside the fixed outer ring 315. Edge rubber rings 316 are adhesively attached to both ends of the fixed outer ring 315. A dust collection box 317 is threadedly and snapped onto the bottom end of the fixed outer ring 315 near the annular guide box 301. A cooling box 318 is threadedly and snapped onto the bottom end of the fixed outer ring 315 near the annular adhesive box 303. Ventilation pipes 319 are threaded onto one side of both the dust collection box 317 and the cooling box 318. A shunt box 320 is welded to one end of the interior. The bottom of the shunt box 320 is evenly provided with shunt holes 321. A vacuum pump 322 is installed at the other end of the vent pipe 319 of the dust collection box 317. A liquid nitrogen pump 323 is installed at the other end of the vent pipe 319 of the cooling box 318. Talc powder is placed at the bottom of the annular adhesion box 303. The input ends of the vacuum pump 322 and the liquid nitrogen pump 323 are electrically connected to the output end of the external controller, respectively, to ensure that the vacuum pump 322 and the liquid nitrogen pump 323 work normally and facilitate the adhesion of talc powder to the outside of the conductor monofilament.

[0022] like Figure 11 As shown, a cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable is manufactured according to the above-mentioned technical solution.

[0023] The working principle and usage process of this invention: In the conductor process, a high-strength tungsten steel mold is used. The mold cavity opening is a streamlined flared structure. The inner surface is treated with diamond coating, which can significantly improve the wear resistance of the mold and the surface smoothness of the conductor, ensuring uniform deformation of the conductor filament during the pressing process. Open the replenishment plug 311 of the replenishment hole 310, pour talcum powder into the annular adhesion box 303, embed the anti-leakage rubber ring 312 inside the wire hole 306, the top surface of the talcum powder must not be higher than the lowest wire hole 306, install the annular discharge pipe 205 at the end of the annular conveying pipe 203 by thread, and the first guide wheel 202 and the second guide wheel 209 correspond one to one, the conductor wire passes through the wire hole 306 of the annular guide box 301 and the annular adhesion box 303 in sequence, the outer side of the conductor wire contacts the wire hole 314 of the anti-leakage sponge 313, then the conductor wire passes under the first guide wheel 202, and then is guided out from above the second guide wheel 209, and finally enters the stranding mold 213 of the wire bundling table 211, which facilitates subsequent guidance and traction; During wire stranding, the frame stranding machine 1 rotates, and the conductor wires are pulled and moved to perform the stranding operation. Vacuum pump 322 and liquid nitrogen pump 323 are started. Liquid nitrogen, intermittently supplied by liquid nitrogen pump 323, passes through vent pipe 319 and distribution box 320, and is dispersed through distribution hole 321 into the talc powder inside cooling box 318. It rapidly turns into gas, expands rapidly in volume, flows along the gaps between the talc powder particles, passes through air vent 304, and lifts up some of the talc powder, causing some of the talc powder to disperse into the annular adhesive layer. Inside the accessory box 303, as the rotating conductor filament and the adhesive guide wheel 308 pass through the dispersed talcum powder, some talcum powder will adhere to the outside of the conductor filament and the embedded groove 309 of the adhesive guide wheel 308. After the conductor filament is guided by the smooth guide wheel 307 and the adhesive guide wheel 308, the talcum powder will adhere to the outside of the conductor filament again. When the conductor filament passes through the wire-passing narrow hole 314 of the leak-proof sponge 313, the excess talcum powder is scraped off, so that the talcum powder is distributed in small amount and evenly on the outside of the conductor filament. The annular guide box 301 and the annular adhesive box 303 rotate within the fixed outer ring 315. The edge rubber ring 316 provides a seal to reduce leakage. As liquid nitrogen absorbs a large amount of heat and cools down when it turns into gas, talc powder has better thermal conductivity than air, which will reduce the temperature of the conductor filament and reduce the problem of plastic deformation caused by excessive friction when the conductor filament is stranded. It also reduces the problem of the conductor filament's strength decreasing due to temperature rise, and further reduces the deformation of the conductor filament during stranding. The vacuum pump 322 reduces the air pressure inside the annular guide box 301, causing a small amount of air and nitrogen to be ejected from the wire-passing hole 314 of the leak-proof sponge 313, which will spray out the dust adhering to the outside of the conductor wire that is about to enter the wire-passing hole 314. The small amount of leaked talcum powder and dust will fall under the action of gravity and pass through the slag hole 302 into the dust collection box 317 to clean the surface of the conductor wire and reduce the probability of the conductor wire being scratched by debris. The conductor monofilament is guided into the stranding die 213 by the first guide wheel 202 and the second guide wheel 209. During this process, the follower tube 201, the annular conveying tube 203, the annular discharge tube 205 and the frame stranding machine 1 rotate synchronously, while the annular feed sleeve 204 remains stationary relative to the ground. Electronic silicone is fed into the annular conveying tube 203 by the pressure plate pump 230. The electronic silicone enters the storage tank 210 of the second guide wheel 209 through the guide tube 207 of the annular discharge tube 205, and the electronic silicone is coated onto the inner side of the conductor monofilament. The electronic silicone is applied while guiding the conductor, which facilitates the subsequent stranding process. When the conductor filament enters the entry hole 215 of the stranding die 213 for stranding, the electronic silicone is squeezed and filled into the gaps between the stranded conductors. During this process, the stranded conductor passes through the combination of the top pressure block 219 and the bottom pressure block 221. After being squeezed, the structure of the stranded conductor becomes more compact. The pressure is monitored by the pressure sensor 223. When the pressure is low, the electric push rod 222 is activated to press down, the connecting spring 218 contracts and rebounds, and the stranded conductor is continuously squeezed. The negative pressure pump 227 is activated, and the excess electronic silicone falls under the action of gravity and negative pressure. It passes through the glue leakage hole 224 and the connecting hole 225, and enters the collection box 229 along the glue leakage channel 226. This reduces the electronic silicone on the outside of the stranded wire, which is convenient for subsequent wiring and reduces waste. The glue injection system consists of a pressure plate pump 230, a high-flow glue outlet valve, a high-pressure resistant pipeline and a quantitative controller. It is linked with the conductor stranding equipment through electrical signals to ensure that the glue fills the gaps in real time during the monofilament stranding process. Each layer of the conductor is filled with electronic silicone. The mechanical force during the stranding process is used to make the glue fully penetrate into all the tiny gaps. During the stranding process, the cooling and anti-scratch component 3 and the lubrication of talc powder reduce the deformation of the conductor filaments during the stranding process of the filling and sealing component 2, thereby improving the overall strength of the cable. The low temperature also slows down the curing speed of the electronic silicone in the filling and sealing component 2, allowing the electronic silicone to fill the gaps more fully and reduce the conductor gaps. Through the above-mentioned compression and injection composite process, a highly flexible, highly conductive, and moisture-proof airtight conductor is developed. In the insulation process, when the stranded conductor is filled with the outer insulation layer, an embedded extrusion die design is adopted to achieve seamless bonding between the insulation material and the outer edge of the conductor. The die flow channel adopts a "gradual shrinkage plus local pressure" structure, and the extrusion pressure is increased by 30% compared with conventional dies, ensuring that the insulation material (such as polyvinyl chloride, cross-linked polyethylene) is fully embedded in the outer edge of the conductor during the extrusion process. By purging the air from the inner insulation layer using an online vacuum exhaust device, and in conjunction with a precision sizing sleeve (concentricity deviation ≤0.1mm), the dimensions of the color stripes on the insulation layer surface are accurate (width deviation ±0.2mm) and the structure is stable (eccentricity ≤10%), further ensuring the overall airtightness of the cable core. For the multi-wire bundle structure of instrument and computer cables, a twisting process is added. An airtight filling polymer is used to fill the gaps in the insulation edges of the wire bundle to ensure the airtightness of each wire bundle. In the copper wire shielding process, when adding the shielding layer, a composite process of loosely winding multiple fine copper wires and extruding and filling with semi-conductive material is used to achieve the airtight seal and electrical safety of the shielding layer. While meeting the requirements for short-circuit current carrying capacity, finer copper wires (the number of wires is increased by 20% to 30% compared to the conventional design) are used to reduce the porosity between individual wires.

[0024] A loose-winding pitch ratio of 7-10 times is adopted to improve structural stability and ensure electrical path between copper wires. The filler material is a thermoplastic semi-conductive material, which is embedded into the gap between copper wires through an extrusion die to achieve mechanical sealing and conductive continuity. Enhanced protection: A semi-conductive nylon tape (0.12mm thick, 20% overlap) is wrapped around the filler layer to improve structural stability and wear resistance; In the cabling process, the different specifications and core shapes of cables increase the difficulty of implementing the airtight structure of the cable core. Cable specifications include equal core and unequal core, round and fan-shaped, two-wire group and three-wire group, etc. Different cable core structures require different sizes of materials for sealing. This process achieves the overall sealing and structural stability of the cable core through the combination of center filling and structural fixing. Filler material: Compressible, airtight polymer (density 0.85~0.95g / cm³) 3 Because the airtight filling polymer is loose before molding, the cable-making equipment needs to be modified to compact it through a customized extrusion device to fill the gap in the center of the cable core. Precision Design: Based on 3D CAD / CAE simulation (ANSYS Workbench), the explosion-proof structure design and simulation verification of the cable core are carried out. The cable core filling size is accurate, and more than 20 specifications of filling elements (error ±0.1mm) are developed to achieve precise positioning and sealing of different cable core structures. At the same time, the bending radius of the cable is reduced, and the convenience and safety of cable installation and laying are improved while filling the gaps inside the cable core. To address the structural instability caused by the lack of filler on the outer edge of the cable core, a high-strength PP cable tie (3-5mm wide) with a large gap wrapping process is adopted. Wrapping parameters: Pitch 50-80mm, tension 30-50N, to ensure the cable core structure is fixed while not affecting the subsequent compression sealing of the inner sheath (cable tie thickness ≤0.3mm, which can be completely embedded and covered by the inner sheath material). In the inner sheath process, considering the characteristic that the area of ​​the outer edge seam of the cable core varies with the specification, a differentiated sealing process is adopted for each specification to ensure that the inner sheath completely seals the outer edge of the cable core.

[0025] Small-gauge cable (≤70mm) 2 Mold design: The "stepped flow channel" extrusion mold is adopted, and the extrusion pressure design is enhanced (40% higher than conventional molds) to maximize the extrusion pressure and make the inner sheath material (such as PVC, PE low smoke halogen-free polyolefin) fully embedded in the outer edge of the cable core.

[0026] Large-gauge cables (>70mm) 2 Innovative process: for 70mm 2 For the above cable products, due to the large area of ​​the outer seam of the cable core, it is not easy to achieve a complete sealing effect by using a single extrusion embedding method. A separate design process is required, adopting a two-step method of "silicone pre-filling embedding plus inner sheath extrusion". The two methods can be combined by tandem extrusion and co-extrusion to distribute and decompose the sealing of the seam, making it easier to achieve a seal.

[0027] Pre-filled: Platinum vulcanization system silicone rubber is selected. This material is relatively soft and can easily embed into the edge gap under extrusion pressure. The formula is adjusted to achieve room temperature vulcanization. Vulcanization inhibitors are added during rubber mixing to inhibit the material vulcanization for 24 hours, ensuring the softness of the material during extrusion and preventing premature vulcanization. It is extruded into the outer edge gap of the cable core through a glue-filling extrusion equipment and naturally vulcanized at room temperature within 48 hours. During the inner sheath extrusion process, an extrusion die is used to extrude the inner sheath, further filling the entire cable core, making the cable round and structurally stable, and achieving an airtight seal of the entire cable core. In the armoring process, if steel strip armor is used, the steel strip armor layer is a double-layer steel strip with a gap wrapping method. Both the inner and outer layers have spiral channels with wrapping gaps, and the spiral channels need to be airtightly sealed.

[0028] Buffering and isolation: PETD composite tape (polyester layer thickness 0.08mm, polymer fiber fluff layer thickness 0.5mm) is wrapped around the inner sheath. The polyester layer acts as an inward isolation layer, while the fluff layer absorbs armor stress outward.

[0029] Spiral channel sealing: Injection molding of armored electrical silicone (5mm width, 1.0mm thickness) onto the surface of the PETD tape. The armored electrical silicone has good fluidity before curing and can be cured at room temperature into a non-corrosive, non-toxic, environmentally friendly polymer material. After curing, it is non-sticky and easy to remove, and does not affect the fabrication of cable terminals on site. The pressure of the steel tape wrapping is used to fill the spiral gap with silicone, break the spiral channel of the inner layer, and block the flow of gas in the inner layer. The outer layer of the steel strip is covered with a low-smoke halogen-free flame-retardant wrapping tape (overlap rate 30%), which is tightly sealed to the outer layer of the steel strip. This not only improves the flame-retardant performance (oxygen index ≥40%) but also buffers the warping of the steel strip when bending, which plays a positive role in the cold resistance and crack resistance of the sheath. If steel wire armor is used, low-viscosity armored electronic silicone is used. The silicone is filled between the steel wires and between the upper and lower layers by twisting and rotating the injection mold with the steel wire (it can be peeled off after curing without affecting the final product). Structural fixation: Steel wire is wrapped with polyester tape (tensile force 20-30N) and tightened to prevent uncured silicone from overflowing. The outer layer is then wrapped with low smoke halogen-free flame retardant tape (thickness 0.2mm) to improve the overall flame retardant and mechanical protection performance. The sealing process of the steel wire armor is similar to that of conductor sealing. In the outer sheath manufacturing process, to ensure a tight fit between the outer sheath and the underlying structure, a semi-extrusion mold combined with a vacuum process is used. Mold design: A semi-extrusion mold is selected, and a vacuum device is used to completely remove the air between the die head and the cable core; Material control: Low fire hazard polyvinyl chloride or low smoke halogen-free polyolefin (LSZH) is used. Precise temperature control (extrusion temperature ±5℃) ensures material flowability and achieves seamless bonding between the outer sheath and the inner structure.

[0030] Through key technological innovations such as conductor compression sealing, seamless insulation layer bonding, precise cable core filling, and composite sealing of armored structure, a "multi-level longitudinal sealing system" is constructed from the conductor to the outer sheath, achieving zero-gap medium isolation of the cable body; This cable will effectively solve the problem of medium conduction hazards in conventional cables in explosion-prone areas, providing oil and gas chemical companies with a three-in-one cable solution that integrates "safety barrier, environmental adaptability, and electrical reliability," and helping to improve industry safety production standards and ensure energy development in extreme environments.

[0031] The above operations can be applied to low-voltage and medium-voltage power cables, as well as control cables and instrument and computer cables of 1-35kV.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable, characterized in that, The frame stranding machine (1) is equipped with a glue-filling and sealing assembly (2), which includes a follower tube (201). A follower tube (201) is installed through the middle of one end of the frame winch (1). A first guide wheel (202) is evenly installed on the outer side of the follower tube (201) away from the frame winch (1). An annular conveying pipe (203) is installed on the follower tube (201). An annular feed sleeve (204) is rotatably sleeved on one end of the annular feed sleeve (203). An annular discharge pipe (205) is installed on the other end of the annular feed sleeve (204) through a thread. A guide pipe (207) is evenly welded through the outer side of the annular feed sleeve (204). A protective sleeve (208) is sleeved on the outer side of the annular discharge pipe (205). A second guide wheel (209) is installed on the outer side of the protective sleeve (208) corresponding to the guide pipe (207). A storage trough (210) is opened in the middle of the second guide wheel (209). A wire-bundling platform (211) is provided on one side of the sheath tube (208). A mold groove (212) is provided at the top of the wire-bundling platform (211). A stranding mold (213) is embedded inside the mold groove (212). An adjustment hole (214) is provided in the middle of the stranding mold (213). An entry hole (215) is provided on one side of the inner wall of the adjustment hole (214). A pull-out hole (216) is provided on one side of the inner wall of the adjustment hole (214).

2. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 1, characterized in that, A top adjusting plate (217) is movably snapped onto the top of the adjusting hole (214). A top pressing block (219) is connected to the bottom surface of the top adjusting plate (217) via a connecting spring (218). A bottom adjusting plate (220) is movably snapped onto the bottom of the adjusting hole (214). A bottom pressing block (221) is connected to the top of the bottom adjusting plate (220) via a connecting spring (218). An electric push rod (222) is installed through the middle of the top surface of the filament bundling platform (211). A pressure sensor (223) is embedded in the middle of the top surface of the top pressure block (219) corresponding to the protruding end of the electric push rod (222). A glue leakage hole (224) is evenly opened in the middle of the bottom pressure block (221). A connecting hole (225) is opened in the middle of the bottom surface of the bottom adjustment plate (220). A glue leakage channel (226) is opened in the middle of the bottom end of the mold groove (212). A negative pressure pump (227) is embedded in one side of the filament bundling platform (211). An inclined baffle (228) is welded at the top of the negative pressure pump (227) in the glue leakage channel (226). A collection box (229) is installed at the bottom end of the filament bundling platform (211). A pressure plate pump (230) is connected to one end of the annular feed sleeve (204).

3. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 2, characterized in that, The diameter of the inlet hole (215) is larger than the diameter of the pull-out hole (216). The inner sides of the top pressure block (219) and the bottom pressure block (221) are provided with guide grooves. After the guide grooves of the top pressure block (219) and the bottom pressure block (221) are spliced ​​together, they form a frustum-shaped through hole with one end larger and the other end smaller. The larger diameter end of the frustum-shaped through hole is the same as the diameter of the inlet hole (215), and the smaller diameter end of the frustum-shaped through hole is the same as the diameter of the pull-out hole (216).

4. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 2, characterized in that, The annular feed sleeve (204) is fixedly sleeved with a limiting end ring (206) near the annular discharge pipe (205). A sealing gasket is embedded on the side of the limiting end ring (206) near the annular discharge pipe (205). Smooth grooves are opened in the middle of the first guide wheel (202) and the second guide wheel (209). The top of the guide tube (207) is attached to the inner side of the second guide wheel (209).

5. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 4, characterized in that, The output of the pressure sensor (223) is electrically connected to the input of the external controller. The output of the external controller is electrically connected to the input of the electric push rod (222), the negative pressure pump (227), and the pressure plate pump (230), respectively. The input of the external controller is electrically connected to the output of the external power supply.

6. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 5, characterized in that, A cooling and anti-scratch assembly (3) is provided on one side of the frame winch (1), and the cooling and anti-scratch assembly (3) includes an annular guide box (301). An annular guide box (301) is fixedly installed on one side of the frame winch (1). Slag leakage holes (302) are evenly distributed on the outer side of the annular guide box (301). An annular adhesion box (303) is installed on one side of the annular guide box (301). Air jet holes (304) are evenly distributed on the outer side of the annular adhesion box (303). An end sealing ring (305) is embedded on the outer side of the annular adhesion box (303). The annular guide box (301), the annular adhesion box (303), and the end sealing ring (305) are... Each part has a threading hole (306) in the middle. The annular guide box (301) is symmetrically equipped with smooth guide wheels (307) near the threading hole (306). The annular adhesive box (303) is symmetrically equipped with adhesive guide wheels (308) near the threading hole (306). The threading hole (306) is inlaid with a leak-proof rubber ring (312). The leak-proof rubber ring (312) is bonded with a leak-proof sponge (313). The leak-proof sponge (313) has a threading narrow hole (314) in the middle.

7. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 6, characterized in that, The annular guide box (301) and the annular adhesive box (303) are both rotatably mounted on the inner side of the fixed outer ring (315). Both ends of the fixed outer ring (315) are glued with edge rubber rings (316). A dust collection box (317) is inserted and snapped into the bottom end of the fixed outer ring (315) near the annular guide box (301). A cooling box (318) is inserted and snapped into the bottom end of the fixed outer ring (315) near the annular adhesive box (303). A ventilation pipe (319) is installed through one side of both the dust collection box (317) and the cooling box (318). A diversion box (320) is welded to one end of the ventilation pipe (319) inside the dust collection box (317) and the cooling box (318). Diversion holes (321) are evenly opened at the bottom of the diversion box (320). A vacuum pump (322) is installed at the other end of the ventilation pipe (319) of the dust collection box (317), and a liquid nitrogen pump (323) is installed at the other end of the ventilation pipe (319) of the cooling box (318).

8. The manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 7, characterized in that, The adhesive guide wheel (308) has a uniformly provided embedding groove (309) on its outer side, the end sealing ring (305) has a supplement hole (310), a supplement plug (311) is installed inside the supplement hole (310) by thread, and talcum powder is placed at the bottom of the annular adhesive box (303). The input terminals of the vacuum pump (322) and the liquid nitrogen pump (323) are electrically connected to the output terminal of the external controller, respectively.

9. A method for manufacturing a cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable, comprising a method using the manufacturing equipment for a cold-resistant, low-smoke, flame-retardant, integrated airtight explosion-proof cable as described in claim 7, characterized in that... Includes the following steps: S1: Conductor process, using high-strength tungsten steel mold, the mold opening adopts polycrystalline coating process, the conductor single wire is uniformly deformed, the conductor shape is round or fan-shaped, the conductor single wire is in the frame stranding machine (1), the conductor single wire passes through the cooling and anti-scratch component (3), and then the glue filling and sealing component (2) is used for glue injection, the glue penetrates into the tiny gaps between the conductor single wires; S2: Insulation process, when the stranded conductor is filled with the outer insulation layer, the mold flow channel adopts a "gradual contraction plus local pressure increase" structure, and the air in the inner insulation layer is emptied by an online vacuum exhaust device; S3: Twisting process of wire group. Instrument and computer cables add a twisting process of wire group, and use airtight filling polymer to densely fill the gaps in the insulation edge of the wire group. S4: Copper wire shielding process, which is a composite process of loosely winding multiple fine copper wires and extruding and filling with semi-conductive material. It uses copper wires with a finer diameter to reduce the porosity between individual wires. S5: Cable forming process, center filling and structural fixing combination process, which uses a customized extrusion device to compact it and fill the central gap of the cable core; S6: Inner sheath process, different sealing processes are adopted according to specifications, and the inner sheath completely seals the outer edge of the cable core; S7: Armoring process. When the steel strip is armored, it is a double layer of steel strip with gaps wrapped around it. The spiral channel is airtightly sealed by wrapping tape inside and outside. When the steel wire is armored, the glue injection mold is used to fill the gaps between the steel wires and the upper and lower layers by twisting and rotating with the steel wire. S8: In the outer sheath process, a semi-extrusion die is used to completely remove the air between the machine head and the cable core, so that the outer sheath and the inner structure are seamlessly bonded.

10. A cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable, characterized in that, The explosion-proof cable (4) is manufactured by the manufacturing method of the cold-resistant, low-smoke, flame-retardant, airtight explosion-proof cable according to claim 9.

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