A nuclear burst resistant coaxial communication cable and a method of making the same

Abstract

This application relates to a nuclear explosion-proof coaxial communication cable and its manufacturing method, belonging to the field of coaxial communication cables. It includes an inner core, comprising an inner conductor and a high-density insulation layer. The high-density insulation layer wraps around the outer surface of the inner conductor. A steel tape wrapping layer is fitted onto the outer surface of the high-density insulation layer. A sheath layer is fitted onto the outer surface of the steel tape wrapping layer. A steel wire wrapping armor layer is fitted onto the outer surface of the sheath layer. An outer sheath is fitted onto the outer surface of the steel wire wrapping armor layer. This application, through the synergistic effect of multiple protective structures, particularly the reinforced design of the steel tape wrapping layer and the double-layer steel wire armor layer, enables the cable to withstand enormous impact loads without damage. The magnetic permeability of the steel tape wrapping layer, combined with the metallic shielding layer and the tight structural design between the layers, forms a multiple electromagnetic shielding barrier.

Description

Technical Field

[0001] This application relates to the technical field of coaxial communication cables, and in particular to a nuclear explosion-proof coaxial communication cable and its preparation method. Background Technology

[0002] In modern communication systems, especially in special environments such as the vicinity of nuclear facilities and military battlefields where there is a risk of nuclear explosion, extremely high requirements are placed on the performance of communication cables.

[0003] Traditional coaxial communication cables typically consist of a basic structure including an inner conductor, an insulation layer, an outer conductor shielding layer, and a sheath.

[0004] For example, a common coaxial cable structure consists of a copper inner conductor at the center, wrapped with an insulation layer made of materials such as polytetrafluoroethylene, an outer conductor made of braided or copper-plated metal shielding mesh, and an outermost layer of plastic sheath to protect the internal structure and provide a certain mechanical strength.

[0005] This type of conventional coaxial cable offers severely inadequate protection against the intense shockwaves and high-intensity electromagnetic radiation generated by a nuclear explosion. When subjected to a nuclear blast, the ordinary sheath is easily torn and deformed, leading to damage to the internal wiring; furthermore, the strong electromagnetic radiation can interfere with signal transmission and may even turn the cable into a conductive path, causing a safety accident.

[0006] While there are some reinforced communication cables on the market, most are only optimized for single harsh environmental factors, such as focusing only on tensile strength or abrasion resistance, and lack comprehensive protection design for extreme and complex environments like nuclear explosions. Summary of the Invention

[0007] To increase the strength of the cable for safe use in areas at risk of nuclear explosion, this application provides a nuclear explosion-proof coaxial communication cable and a method for its preparation.

[0008] This application provides a nuclear explosion-proof coaxial communication cable and its manufacturing method, which adopts the following technical solution:

[0009] A nuclear explosion-proof coaxial communication cable includes an inner core, which comprises an inner conductor and a high-density insulation layer. The high-density insulation layer wraps around the outer surface of the inner conductor. A steel tape wrapping layer is fitted onto the outer surface of the high-density insulation layer. A sheath layer is fitted onto the outer surface of the steel tape wrapping layer. A steel wire wrapping armor layer is fitted onto the outside of the sheath layer. An outer sheath is fitted onto the outside of the steel wire wrapping armor layer. The outer sheath is fixed to the steel wire wrapping armor layer by an adhesive.

[0010] By adopting the above technical solution, the inner core is designed with a structure combining an inner conductor and a high-density insulation layer. This ensures good conductivity and signal transmission performance through the inner conductor during use. A high-density insulation layer, made of high-density polyolefin insulating material, is wrapped around the outer surface of the inner conductor. This material's properties not only guarantee excellent insulation performance but also buffer the impact of external pressure changes on the inner conductor to a certain extent. A steel tape wrapping layer is then placed around the inner core to protect it. The steel tape is made of high-strength alloy steel and is precisely wound in a tightly spiraled arrangement, forming a continuous and uniform annular support frame. This structure significantly improves the overall compressive strength of the cable, effectively resisting the radial pressure from a nuclear explosion shock wave and preventing the cable from being flattened and deformed. Simultaneously, the steel tape itself has good magnetic permeability, which helps enhance the shielding effect against electromagnetic radiation. A special elastic rubber sheath is then applied to the outside of the steel tape wrapping layer as a protective layer. This sheath layer uses a modified nitrile rubber formula with added nano-scale carbon fiber reinforcement, giving it high elasticity, wear resistance, and tear resistance. The sheath thickness is optimized based on the cable's operating environment and specifications, ensuring a tight fit against the steel tape layer while absorbing impact energy and preventing moisture, dust, and other impurities from penetrating the internal structure. Furthermore, the sheath surface undergoes special treatment, providing flame-retardant properties and further enhancing the cable's safety in hazardous situations such as fires. Next, a steel wire-wrapped armor layer is installed outside the sheath layer to further strengthen the cable's mechanical protection. Two layers of cross-braided steel wire armor are added to the outside of the sheath layer. The steel wires are high-strength galvanized steel wires with precisely calculated and selected diameters to ensure maximum tensile strength and puncture resistance without compromising cable flexibility. The two layers of steel wire are braided in opposite directions, forming a mesh-like structure that mutually restrains and supports each other, effectively dispersing impact forces from all directions and preventing the cable from being punctured or cut by sharp objects. Finally, an outer sheath is installed, made of high-density polyethylene, offering excellent weather resistance, abrasion resistance, and chemical stability. It not only protects the internal steel wire armor and other structures from corrosion by ultraviolet rays, acids and alkalis, but also increases the surface friction of the cable to a certain extent, making it easier to lay and fix.

[0011] Optionally, the steel strip wrapping layer includes a first steel strip wrapping single layer and a second steel strip wrapping single layer. The second steel strip wrapping single layer is sleeved and installed on the outer surface of the first steel strip wrapping single layer, and the two ends of the second steel strip wrapping single layer and the first steel strip wrapping single layer are fixedly connected.

[0012] By adopting the above technical solution, and designing the steel strip wrapping layer as a combination of a first single-layer steel strip wrapping and a second single-layer steel strip wrapping, a double-layer protection effect can be achieved during use. Furthermore, the staggered gaps in the spiral frames of the two steel strips effectively resist the shock waves and electromagnetic pulses generated by a nuclear explosion. The high-strength alloy steel strip possesses high strength and toughness, capable of withstanding significant impact forces. The design of the connecting inner and outer rings, along with spot welding reinforcement, increases the overall robustness of the steel strip wrapping layer.

[0013] Optionally, the first steel strip wrapping layer includes a first spiral frame and a connecting inner ring, the connecting inner ring being installed at both ends of the first spiral frame and fixedly connected to the first spiral frame.

[0014] By adopting the above technical solution, the first steel strip wrapping layer is designed as a structure in which the first spiral frame and the connecting inner ring cooperate. During use, the connecting inner rings at both ends can better position and connect with the second steel strip wrapping layer, so that the first steel strip wrapping layer and the second steel strip wrapping layer will not be misaligned during use.

[0015] Optionally, the second steel strip wrapping layer includes a second spiral frame and a connecting outer ring. The connecting outer ring is fixedly installed at both ends of the second spiral frame and is sleeved and fixed on the outer side of the connecting inner ring.

[0016] By adopting the above technical solution, the second steel strip wrapping layer is designed as a structure that matches the second spiral frame and the connecting outer ring. In use, the connecting outer rings at both ends are fitted onto the outer side of the connecting inner ring of the first steel strip wrapping layer. After the connecting inner ring and the connecting outer ring are welded and fixed, the second spiral frame can be stably fitted onto the outside of the first spiral frame for protection.

[0017] Optionally, the sheath layer is a rubber sheath, and the surface of the sheath layer is coated with a flame-retardant layer.

[0018] By adopting the above technical solutions, the rubber sheath possesses excellent flexibility, protecting the internal structure from external environmental corrosion. The flame-retardant coating on the surface enhances the cable's fire resistance, effectively preventing the spread of fire in the event of a fire and ensuring the safe operation of the cable.

[0019] Optionally, the wire-wrapped armor layer is a mesh structure made of two steel wires woven in opposite directions.

[0020] By adopting the above technical solution, the steel wire wrapping armor layer is a mesh structure made of two steel wires woven in opposite directions, which has high strength and impact resistance, and can further enhance the mechanical protection capability of the cable and prevent the cable from being damaged when subjected to external impact.

[0021] A method for manufacturing a nuclear explosion-proof coaxial communication cable includes the following steps:

[0022] S1: Inner conductor preparation involves processing high-purity oxygen-free copper rods into fine wires of the required diameter through multiple drawing processes, followed by annealing to eliminate work hardening. Next, the copper wire undergoes surface cleaning to remove oil and oxide layers.

[0023] S2: High-density insulation layer preparation involves using an extrusion machine to heat and melt pre-prepared high-density polyolefin particles, then uniformly coating them onto the surface of the inner conductor. The formed insulation layer undergoes cooling and shaping, and online testing. Once qualified, it proceeds to the next process.

[0024] S3; Steel strip wrapping preparation: The first and second spiral frames are formed and processed. The inner rings are welded and fixed at both ends of the formed first spiral frame, and the outer rings are welded and fixed at both ends of the second spiral frame. The first and second spiral frames are assembled and fixed after forming. Then, the first steel strip wrapping layer is installed in the second steel strip wrapping layer. The inner rings and outer rings are welded together. At the same time, spot welding is selectively performed between each turn of steel strip in the first and second spiral frames to increase the overall firmness. Finally, the steel strip wrapping layer is sleeved and fixed on the outside of the high-density insulation layer.

[0025] S4: Sheath layer preparation. The semi-finished product prepared in S3 is placed into a mold, and modified nitrile rubber compound is injected. Then, a vulcanization reaction is carried out under high temperature and high pressure. The vulcanization process is controlled by a segmented temperature rise curve to ensure that the rubber is fully cross-linked and cured, and tightly bonded to the steel strip into a whole.

[0026] S5: Steel wire wrapped armor braiding. Two high-strength galvanized steel wires of different colors are cross-woven according to a pattern and density using a high-speed braiding machine to form a double-layer steel wire armor structure. After weaving, the ends of the steel wires are treated to prevent loosening and unraveling.

[0027] S6: Outer sheath preparation, using an extrusion coating process to evenly cover the steel wire armor surface with high-density polyethylene material. The thickness of the polyethylene sheath is controlled by adjusting the die of the extruder according to the cable diameter.

[0028] By adopting the above technical solutions, the inner conductor is made of high-purity oxygen-free copper rod processed into fine wire. High-purity oxygen-free copper has good conductivity, ensuring stable signal transmission. Annealing treatment eliminates work hardening, improves the flexibility and ductility of the copper wire, and facilitates subsequent processing. Surface cleaning removes oil and oxide layers, ensuring a good bond between the inner conductor and the insulation layer and reducing signal loss during transmission. High-density polyolefin particles are used to coat the surface of the inner conductor. High-density polyolefin has good insulation and mechanical properties, effectively isolating the inner conductor from external electrical interference and protecting it from environmental influences. Cooling and online testing ensure that the quality and performance of the insulation layer meet requirements. Precision extrusion equipment is used, and parameters such as temperature, pressure, and speed are strictly controlled during the extrusion process to ensure uniform insulation layer thickness and the absence of bubbles and impurities. Automated wrapping equipment is used, and the position and overlap of the steel strip are monitored in real time during the wrapping process to ensure stable and reliable wrapping quality. The semi-finished product with the steel strip wrapping is placed in a mold for vulcanization. The vulcanization process uses a segmented temperature rise curve to ensure the rubber is fully cross-linked and cured, tightly bonding with the steel strip into a single unit. A high-speed braiding machine is used for cross-braiding. During braiding, it is crucial to maintain constant tension in the steel wires to avoid loosening or over-tightening. After braiding, the ends of the steel wires are treated to prevent loosening and unraveling. During the outer sheath preparation process, the extruder die can be adjusted according to the cable diameter to ensure the polyethylene sheath thickness meets design requirements.

[0029] Optionally, in S5, the forming process of the first and second spiral frames uses an automated wrapping device to spirally wind high-strength alloy steel strips cut to a certain width around the outside of the insulation layer at a preset angle and tension. The width of the alloy steel strip used in the first spiral frame is smaller than the width of the alloy steel strip used in the second spiral frame, so that the gaps can be misaligned after spiral forming.

[0030] By adopting the above technical solution, the first spiral frame and the second spiral frame are made of high-strength alloy steel strips of a certain width spirally wound at a preset angle and tension, thereby forming a spiral double-layer protective structure. Furthermore, by processing steel strips of different widths, gap misalignment can be achieved, further increasing the overall protective effect.

[0031] Optionally, in S4, after vulcanization, the sheath is trimmed and polished to make its surface smooth and flat.

[0032] By adopting the above technical solution, the surface of the sheath after vulcanization is relatively rough, which is not conducive to the next step of processing. Therefore, it is necessary to trim and polish it to ensure that the edges and surface are more integrated.

[0033] Optionally, in S6, after the outer sheath is prepared, the cable is water-cooled and shaped and then pulled and wound to obtain the finished cable.

[0034] By adopting the above technical solution, the water-cooled shaping process ensures that the cable can be cooled and shaped quickly, which facilitates the subsequent winding process by the traction winding mechanism, thereby increasing the cable processing efficiency.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] High impact resistance: Through the synergistic effect of the multi-layer protective structure, especially the reinforced design of the steel tape wrapping layer and the double-layer steel wire armor layer, the cable can withstand huge impact loads without being damaged.

[0037] Strong resistance to electromagnetic radiation: The magnetic properties of the steel strip wrapping layer, combined with the metal shielding layer and the tight structural design between each layer, form a multi-layer electromagnetic shielding barrier.

[0038] Long lifespan and high reliability: Optimized material selection and advanced manufacturing processes ensure excellent compatibility and durability among the cable components. The high elasticity and abrasion resistance of the modified nitrile rubber sheath, the weather resistance and chemical stability of the polyethylene outer sheath, and the strong bonding between the layers greatly extend the cable's service life in harsh environments, reducing maintenance costs and replacement frequency.

[0039] High flexibility and operability: Despite the addition of a multi-layered protective structure, the cable retains a certain degree of flexibility through reasonable design and material selection, facilitating laying and installation. Meanwhile, the polyethylene outer sheath has a moderate surface friction coefficient, which is beneficial for fixing and deploying in different terrains and usage scenarios. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the cable structure in an embodiment of this application.

[0041] Figure 2 This is a schematic diagram of the steel strip wrapping layer in the embodiments of this application.

[0042] Figure 3 yes Figure 2 Side view of the device shown.

[0043] Figure 4 yes Figure 3 The device shown is a cross-sectional view along the AA direction.

[0044] Explanation of reference numerals in the attached drawings: 1. Inner core; 11. Inner conductor; 12. High-density insulation layer; 2. Steel strip wrapping layer; 21. First steel strip wrapping single layer; 211. First spiral frame; 212. Connecting inner ring; 22. Second steel strip wrapping single layer; 221. Second spiral frame; 222. Connecting outer ring; 3. Sheath layer; 4. Steel wire wrapping armor layer; 5. Outer sheath. Detailed Implementation

[0045] The present application will be further described in detail below with reference to the accompanying drawings.

[0046] This application discloses a nuclear explosion-proof coaxial communication cable and its preparation method.

[0047] Reference Figure 1A nuclear explosion-proof coaxial communication cable includes an inner core 1, which comprises an inner conductor 11 and a high-density insulation layer 12. The high-density insulation layer 12 wraps around the outer surface of the inner conductor 11. A steel tape wrapping layer 2 is fitted onto the outer surface of the high-density insulation layer 12. A sheath layer 3 is fitted onto the outer surface of the steel tape wrapping layer 2. A steel wire wrapping armor layer 4 is fitted onto the outer surface of the sheath layer 3. An outer sheath 5 is fitted onto the outer surface of the steel wire wrapping armor layer 4 and is fixed to the steel wire wrapping armor layer 4 with adhesive. By designing the inner core 1 with a structure in which the inner conductor 11 and the high-density insulation layer 12 cooperate, good conductivity and signal transmission performance can be guaranteed through the inner conductor 11 during use. Furthermore, a high-density insulation layer 12 is wrapped around the outer surface of the inner conductor 11. The high-density insulation layer 12 is made of high-density polyolefin insulation material. The properties of this material not only ensure that the cable has excellent insulation performance, but also buffer the impact of external pressure changes on the inner conductor 11 to a certain extent. The inner core 1 is protected by a steel strip wrapping layer 2, which is placed around it. The steel strip is made of high-strength alloy steel and is spirally and tightly arranged using a precise winding process, forming a continuous and uniform annular support frame. This structure significantly improves the overall compressive strength of the cable, effectively resisting the radial pressure from a nuclear explosion shock wave and preventing the cable from being flattened and deformed. Simultaneously, the steel strip itself has good magnetic conductivity, which helps enhance the shielding effect against electromagnetic radiation. A special elastic rubber sheath 3 is applied to the outside of the steel strip wrapping layer 2. This sheath layer 3 uses a modified nitrile rubber formula with added nano-scale carbon fiber reinforcement, giving it high elasticity, wear resistance, and tear resistance. The sheath thickness is optimized according to the cable's operating environment and specifications, ensuring a tight fit to the steel strip layer while absorbing impact energy, preventing moisture, dust, and other impurities from penetrating the internal structure. Furthermore, the sheath surface undergoes special treatment, providing flame-retardant properties, further improving the cable's safety in dangerous situations such as fires. Next, a steel wire-wrapped armor layer 4 is installed outside the sheath layer 3 to further enhance the cable's mechanical protection performance. Two layers of cross-braided steel wire armor are added outside the sheath layer 3. The steel wire is made of high-strength galvanized steel wire, with a diameter precisely calculated and selected to ensure maximum tensile strength and puncture resistance without affecting the cable's flexibility. The two layers of steel wire are braided in opposite directions, forming a mesh-like structure that mutually restrains and supports each other, effectively dispersing impact forces from all directions and preventing the cable from being punctured or cut by sharp objects. Finally, an outer sheath 5 is installed. The outer sheath 5 is a high-density polyethylene sheath with good weather resistance, abrasion resistance, and chemical stability. It not only protects the internal steel wire armor and other structures from corrosion by ultraviolet rays, acids, alkalis, and other substances, but also increases the surface friction of the cable to a certain extent, facilitating laying and fixing.

[0048] Reference Figure 2, Figure 3 and Figure 4 The steel strip wrapping layer 2 includes a first steel strip wrapping layer 21 and a second steel strip wrapping layer 22. The second steel strip wrapping layer 22 is sleeved and installed on the outer surface of the first steel strip wrapping layer 21, and the two ends of the second steel strip wrapping layer 22 and the first steel strip wrapping layer 21 are fixedly connected. By designing the steel strip wrapping layer 2 into a structure where the first steel strip wrapping layer 21 and the second steel strip wrapping layer 22 cooperate, a double-layer protection effect can be achieved during use. Furthermore, the staggered gaps of the spiral frames of the two steel strips effectively resist the shock waves and electromagnetic pulses generated by a nuclear explosion. The high-strength alloy steel strip has high strength and toughness and can withstand large impact forces. The design of the connecting inner ring 212 and the connecting outer ring 222, as well as the spot welding reinforcement, increases the overall robustness of the steel strip wrapping layer 2. The first steel strip wrapping layer 21 includes a first spiral frame 211 and a connecting inner ring 212. The connecting inner ring 212 is installed at both ends of the first spiral frame 211 and is fixedly connected to the first spiral frame 211. By designing the first steel strip wrapping layer 21 into a structure where the first spiral frame 211 and the connecting inner ring 212 cooperate, the connecting inner rings 212 at both ends can be used to better position and connect with the second steel strip wrapping layer 22, ensuring that the first steel strip wrapping layer 21 and the second steel strip wrapping layer 22 do not become misaligned during use. The second steel strip wrapping layer 22 includes a second spiral frame 221 and a connecting outer ring 222. The connecting outer ring 222 is fixedly installed at both ends of the second spiral frame 221 and is sleeved and fixed on the outer surface of the connecting inner ring 212. By designing the second steel strip wrapping layer 22 into a structure that matches the second spiral frame 221 and the connecting outer ring 222, in use, the connecting outer rings 222 at both ends are fitted onto the outer side of the connecting inner ring 212 of the first steel strip wrapping layer 21. After the connecting inner ring 212 and the connecting outer ring 222 are welded and fixed, the second spiral frame 221 can be stably fitted onto the outside of the first spiral frame 211 for protection.

[0049] Reference Figure 1 The sheath layer 3 is a rubber sheath, and its surface is coated with a flame-retardant layer. The rubber sheath has good flexibility, protecting the internal structure from external environmental corrosion. The flame-retardant coating improves the cable's fire resistance, effectively preventing the spread of fire in the event of a fire and ensuring the cable's safe operation. The steel wire wrapped armor layer 4 is a mesh structure formed by two steel wires woven in opposite directions. This mesh structure provides high strength and impact resistance, further enhancing the cable's mechanical protection and preventing damage from external impacts.

[0050] A method for manufacturing a nuclear explosion-proof coaxial communication cable includes the following steps: Inner conductor preparation: High-purity oxygen-free copper rod is processed into fine wires of the required diameter through multiple drawing processes, followed by annealing to eliminate work hardening. Next, the copper wire undergoes surface cleaning to remove oil and oxide layers. Specifically, a 99.99% pure high-purity oxygen-free copper rod is selected and processed into fine wires with a diameter of 1.0 mm using a YGL-6 / 500 continuous drawing machine through multiple drawing processes. The fine wires are placed in an annealing furnace and annealed at 350℃ for 1.5 hours to eliminate work hardening. Then, an ultrasonic cleaner (model KQ-500DE) is used to perform surface cleaning of the copper wire to remove oil and oxide layers.

[0051] The high-density insulation layer is prepared by using precision extrusion equipment to heat and melt pre-prepared high-density polyolefin granules, which are then uniformly coated onto the surface of the inner conductor. After molding, the insulation layer undergoes cooling and online testing; only those that pass the test proceed to the next process. Specifically, a single-screw extruder (model SJ65) is used to heat and melt high-density polyethylene granules with a density of 0.95 g / cm³, which are then uniformly coated onto the surface of the inner conductor. The molded insulation layer is then cooled and shaped in a water bath and subjected to online testing using a capacitance detector (model ZJ-200). Only those that pass the test proceed to the next process.

[0052] The steel strip wrapping layer is prepared by forming and processing a first and second helical frame. Inner rings are welded and fixed to both ends of the formed first helical frame, and outer rings are welded and fixed to both ends of the second helical frame. After forming, the first and second helical frames are assembled and fixed. Then, the first steel strip wrapping layer is installed within the second steel strip wrapping layer. The inner and outer rings are electric welded. Simultaneously, selective spot welding is performed between each turn of the steel strip in the first and second helical frames to increase overall strength. Finally, the steel strip wrapping layer is fitted and fixed onto the outside of the high-density insulation layer. The forming and processing of the first and second helical frames utilizes automated wrapping equipment to spirally wind high-strength alloy steel strips of a certain width around the outside of the insulation layer at a preset angle and tension. The width of the alloy steel strip used in the first helical frame is smaller than that used in the second helical frame to allow for misalignment of the gaps after spiral forming. Specifically, an RB-500 wrapping machine is used to process 0.2mm thick 304 stainless steel strips into a first spiral frame and a second spiral frame. The steel strip width used for the first spiral frame is 10mm, and the steel strip width used for the second spiral frame is 15mm. Inner rings are welded and fixed at both ends of the first spiral frame, and outer rings are welded and fixed at both ends of the second spiral frame. The first and second spiral frames are assembled and fixed. Then, the first steel strip wrapping layer is installed in the second steel strip wrapping layer. The inner and outer rings are welded together, and spot welding is selectively performed between each turn of the steel strip to increase overall strength. Finally, the steel strip wrapping layer is fitted and fixed to the outside of the high-density insulation layer.

[0053] The semi-finished product prepared in the previous step is placed into a mold, and the modified nitrile rubber compound is injected. Then, a vulcanization reaction is carried out under high temperature and high pressure. The vulcanization process uses a segmented temperature rise curve to ensure the rubber is fully cross-linked and cured, and tightly bonded to the steel strip as a whole. After vulcanization, the sheath is trimmed and polished to make its surface smooth and flat. Specifically, the semi-finished product prepared in the previous step is placed into a custom mold, and the nitrile rubber compound modified with plasticizers and antioxidants is injected. It is then placed in a vulcanization tank for high temperature and high pressure vulcanization. The vulcanization temperature is controlled at 160℃, the pressure at 10MPa, and a three-segment temperature rise curve is used: first, the temperature is raised to 100℃ and held for 30 minutes; then, it is raised to 130℃ and held for 60 minutes; finally, it is raised to 160℃ and held for 90 minutes. After vulcanization, the sheath is trimmed and polished using an S3SL-250 grinding wheel to make its surface smooth and flat.

[0054] The steel wire wrapping armor braiding method utilizes a high-speed braiding machine to cross-weave two high-strength galvanized steel wires of different colors according to a pattern and density, forming a double-layer steel wire armor structure. After weaving, the ends of the steel wires are treated to prevent loosening and unraveling. Specifically, an SB-800 braiding machine is used to cross-weave two 0.8mm diameter high-strength galvanized steel wires of different colors according to a pattern and density, forming a double-layer steel wire armor structure. After weaving, the ends of the steel wires are treated to prevent loosening and unraveling.

[0055] The outer sheath is prepared by uniformly coating the steel wire armor surface with high-density polyethylene material using an extrusion coating process. The thickness of the polyethylene sheath is controlled by adjusting the extruder die according to the cable diameter. After the outer sheath is prepared, the cable undergoes water cooling and shaping, followed by traction and winding to obtain the finished cable. Specifically, an SJ90 single-screw extruder is used to uniformly coat the steel wire armor surface with high-density polyethylene material using an extrusion coating process. The extruder die is adjusted according to the cable diameter to control the polyethylene sheath thickness to 2.0 mm. After the outer sheath is prepared, the cable undergoes water cooling and shaping in a water tank, is pulled by a QY-500 traction machine, and finally wound up using an SJ-1000 winding machine to obtain the finished cable.

[0056] The implementation principle of the nuclear explosion-proof coaxial communication cable and its preparation method in this application is as follows: The inner conductor 11 is made of high-purity oxygen-free copper rod processed into fine wire. High-purity oxygen-free copper has good conductivity, which can ensure stable signal transmission. Annealing treatment eliminates work hardening, improves the flexibility and ductility of the copper wire, and facilitates subsequent processing. Surface cleaning treatment removes oil and oxide layers, ensuring good bonding between the inner conductor 11 and the insulation layer and reducing signal loss during transmission. High-density polyolefin particles are used to coat the surface of the inner conductor 11. High-density polyolefin has good insulation and mechanical properties, which can effectively isolate the inner conductor 11 from external electrical interference and protect the inner conductor 11 from the influence of the external environment. Cooling and shaping and online testing ensure that the quality and performance of the insulation layer meet the requirements. Precision extrusion equipment is used, and parameters such as temperature, pressure, and speed need to be strictly controlled during the extrusion process to ensure that the insulation layer thickness is uniform and free of bubbles and impurities. Automated wrapping equipment is used, and the position and overlap rate of the steel strip need to be monitored in real time during the wrapping process to ensure stable and reliable wrapping quality. The semi-finished product with the steel strip wrapping layer 2 is placed in a mold for vulcanization. The vulcanization process is controlled by a segmented temperature rise curve to ensure that the rubber is fully cross-linked and cured, and tightly bonded to the steel strip into a whole. A high-speed braiding machine is used for cross-braiding. During the braiding process, it is important to maintain constant tension in the steel wires to avoid loosening or over-tightening. After braiding, the ends of the steel wires are treated to prevent loosening and unraveling. During the preparation of the outer sheath 5, the extruder die can be adjusted according to the cable diameter to ensure that the thickness of the polyethylene sheath meets the design requirements. The coated cable undergoes water cooling, shaping, and traction winding processes to finally obtain the finished cable.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A nuclear burst resistant coaxial communication cable comprising an inner core (1), characterized in that: The inner core (1) includes an inner conductor (11) and a high-density insulation layer (12). The high-density insulation layer (12) is wrapped around the outer surface of the inner conductor (11). A steel strip wrapping layer (2) is sleeved on the outer surface of the high-density insulation layer (12). A sheath layer (3) is sleeved on the outer surface of the steel strip wrapping layer (2). A steel wire wrapping armor layer (4) is sleeved on the outside of the sheath layer (3). An outer sheath (5) is sleeved on the outside of the steel wire wrapping armor layer (4). The outer sheath (5) is fixed to the steel wire wrapping armor layer (4) by an adhesive.

2. A nuclear burst resistant coaxial communication cable according to claim 1, wherein: The steel strip wrapping layer (2) includes a first steel strip wrapping single layer (21) and a second steel strip wrapping single layer (22). The second steel strip wrapping single layer (22) is sleeved and installed on the outer side of the first steel strip wrapping single layer (21), and the two ends of the second steel strip wrapping single layer (22) and the first steel strip wrapping single layer (21) are fixedly connected.

3. A nuclear burst resistant coaxial communication cable according to claim 2, wherein: The first steel strip wrapping single layer (21) includes a first spiral frame (211) and a connecting inner ring (212). The connecting inner ring (212) is installed at both ends of the first spiral frame (211) and is fixedly connected to the first spiral frame (211).

4. A nuclear burst resistant coaxial communication cable according to claim 3, wherein: The second steel strip wrapping single layer (22) includes a second spiral frame (221) and a connecting outer ring (222). The connecting outer ring (222) is fixedly installed at both ends of the second spiral frame (221), and the connecting outer ring (222) is sleeved and fixed on the outer side of the connecting inner ring (212).

5. A nuclear burst protective coaxial communication cable according to claim 1 wherein: The sheath layer (3) is a rubber sheath, and the surface of the sheath layer (3) is coated with a flame-retardant layer.

6. The nuclear-proof coaxial communication cable according to claim 1, characterized in that: The steel wire wrapping armor layer (4) is a mesh structure made of two steel wires woven in opposite directions.

7. A method for preparing a nuclear-proof coaxial communication cable as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Inner conductor preparation, high-purity oxygen-free copper rod is processed into fine wire of the required diameter through multiple wire drawing processes, and then the work hardening phenomenon is eliminated by annealing treatment. Next, the copper wire is surface cleaned to remove oil and oxide layer. S2: High-density insulation layer preparation: Using extrusion equipment, pre-prepared high-density polyolefin particles are heated and melted, and then uniformly coated onto the surface of the inner conductor. After the insulation layer is formed, it is cooled and shaped and tested online. After passing the test, it enters the next process. S3: Steel strip wrapping preparation: The first and second spiral frames are formed and processed. The inner rings are welded and fixed at both ends of the formed first spiral frame, and the outer rings are welded and fixed at both ends of the second spiral frame. The first and second spiral frames are assembled and fixed after forming. Then, the first steel strip wrapping layer is installed in the second steel strip wrapping layer. The inner rings and outer rings are welded together. At the same time, spot welding is selectively performed between each turn of steel strip in the first and second spiral frames to increase the overall firmness. Finally, the steel strip wrapping layer is sleeved and fixed on the outside of the high-density insulation layer. S4: Sheath layer preparation. The semi-finished product prepared in S3 is placed into the mold, and the modified nitrile rubber compound is injected. Then, a vulcanization reaction is carried out under high temperature and high pressure conditions. The vulcanization process is controlled by a segmented temperature rise curve to ensure that the rubber is fully cross-linked and cured, and tightly bonded to the steel strip into a whole. S5: Steel wire wrapping armor braiding. Two high-strength galvanized steel wires of different colors are cross-braided according to the set pattern and density using a high-speed braiding machine to form a double-layer steel wire armor structure. After the braiding is completed, the ends of the steel wires are treated to prevent loosening and unraveling. S6: Outer sheath preparation: High-density polyethylene material is evenly covered on the surface of the steel wire armor through an extrusion coating process. The thickness of the polyethylene sheath is controlled by adjusting the die head of the extruder according to the cable diameter.

8. The method for preparing a nuclear explosion-proof coaxial communication cable according to claim 7, characterized in that: In S5, the forming and processing of the first and second spiral frames are carried out by an automated wrapping device. High-strength alloy steel strips cut to a certain width are spirally wound around the outside of the insulation layer at a preset angle and tension. The width of the alloy steel strip used in the first spiral frame is smaller than that used in the second spiral frame so that the gaps can be misaligned after spiral forming.

9. The method for preparing a nuclear explosion-proof coaxial communication cable according to claim 7, characterized in that: In S4, after vulcanization, the sheath is trimmed and polished to make its surface smooth and flat.

10. The method for preparing a nuclear explosion-proof coaxial communication cable according to claim 7, characterized in that: In S6, after the outer sheath is prepared, the cable is water-cooled and shaped, and then pulled and wound to obtain the finished cable.

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