Micro-positive-pressure oxygen-prevention and retardation-of-polymerization silk-covered wire cable production line and production process thereof
By integrating a micro-positive pressure oxygen inhibition system and a segmented gradient constant temperature heating module into the silk-insulated wire and cable production line, the problem of oxygen inhibition during the photocuring process was solved, achieving complete curing of the insulating varnish and improving product performance, while reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-20
- Publication Date
- 2026-07-10
Smart Images
Figure CN122352518A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wire processing technology, specifically to a wire production line and process for wire insulated cables with micro-positive pressure to prevent oxygen polymerization. Background Technology
[0002] In the production of silk-insulated wires and cables, traditional manufacturing processes typically include steps such as wrapping, impregnation, and thermosetting. Among these, photocuring technology is increasingly widely used in the insulation varnish curing stage due to its advantages such as high efficiency, energy saving, and environmental friendliness.
[0003] A key challenge in the practical industrial application of photopolymerization technology is the polymerization inhibition effect. Oxygen in the air quenches the free radicals generated by photoinitiators, severely inhibiting the cross-linking polymerization reaction of unsaturated resins and other insulating varnishes, leading to problems such as sticky coating surfaces, incomplete curing, and low cross-linking density. This not only seriously affects the final insulation performance, temperature resistance, abrasion resistance, and aging resistance of the wire, but may also lead to an increased product defect rate.
[0004] While existing technologies have attempted to overcome oxygen-inhibited polymerization by using high-power light sources or increasing the amount of photoinitiator, these methods are costly and may damage cables or cause material degradation due to overexposure. Another approach is to physically isolate oxygen, such as curing in a nitrogen environment. However, traditional methods struggle to maintain a stable, efficient, and low-cost oxygen-free environment in continuous production lines, especially for wire-insulated production lines requiring horizontal threading and continuous operation, where sealing, pressure stability, and gas consumption costs pose significant obstacles. Therefore, there is an urgent need in the field for a photocuring solution that can be seamlessly integrated into existing production lines, effectively isolates oxygen, and operates economically. Summary of the Invention
[0005] The main objective of this invention is to overcome the aforementioned deficiencies in the prior art and provide a production line and process for silk-insulated wire cables with micro-positive pressure oxygen inhibition. While retaining the core advantages of the original production line—single-time impregnation, horizontal, bend-free conveying, and segmented photocuring—this invention integrates a micro-positive pressure oxygen inhibition system. This system creates a micro-positive pressure inert gas environment within the curing chamber, fundamentally isolating external air and eliminating residual oxygen. This completely suppresses the oxygen inhibition effect of the photocuring reaction, solving the problems of insufficient curing, low cross-linking density, and inadequate insulation and mechanical properties in the prior art. Simultaneously, it achieves closed-loop pressure control and inert gas recycling, balancing production efficiency, product performance, and operating costs, and adapting to the needs of continuous industrial production. As a complementary optimization, a constant-temperature heating module is installed at the cable outlet of the curing chamber to maintain a constant temperature on the surface of the cable after deep photocuring. This promotes the full completion of the post-cross-linking reaction of the insulating varnish surface, further optimizing the coating surface performance and solving problems such as interruption of the post-cross-linking reaction and excessive internal stress in the coating caused by a sudden temperature drop during cable output.
[0006] To achieve the above objectives, the technical solution of the present invention is as follows: On one hand, the present invention provides a production line for silk-insulated wire and cable with micro-positive pressure anti-oxidation and polymerization inhibition, including a wire feeding device, a straightening device, a wrapping device, an impregnation device, a light curing device and a winding device arranged sequentially along the cable conveying direction. The light curing device includes a curing box with a sealed box structure. A focusing tube is installed inside the curing box. Multiple sets of UV curing light sources are uniformly arranged circumferentially on the inner sidewall of the focusing tube to achieve full circumferential light curing without dead angles on the cable passing through the focusing tube.
[0007] The photocuring equipment also includes a micro-positive pressure oxygen-preventing and polymerization-inhibiting system; the micro-positive pressure oxygen-preventing and polymerization-inhibiting system includes an inert gas source, a pressure-stabilizing gas supply component, a sealing and threading component, a pressure monitoring component, and a circulation and purification component;
[0008] The sealing cable threading assembly is installed at the cable inlet and cable outlet of the curing chamber. The inert gas source is connected to the inner cavity of the curing chamber through the pressure stabilizing gas supply assembly. The pressure monitoring assembly is installed inside the curing chamber and is connected to the pressure stabilizing gas supply assembly. The inlet and outlet of the circulation purification assembly are connected to the inner cavity of the curing chamber, forming a closed-loop circulation circuit for inert gas.
[0009] The inner cavity of the curing chamber maintains a gauge pressure of 100-500Pa inert gas environment under working conditions through a micro-positive pressure oxygen inhibition system, which is used to isolate the outside air and eliminate the oxygen inhibition effect of oxygen in the inner cavity of the curing chamber on the photocuring reaction.
[0010] Furthermore, the pressure-stabilizing gas supply assembly includes a pressure-reducing valve, a precision flow meter, an electromagnetic control valve, and a one-way valve connected in sequence. The inlet of the pressure-reducing valve is connected to an inert gas source, and the outlet of the one-way valve is connected to the inner cavity of the curing chamber through a gas distribution pipeline. The outlet of the gas distribution pipeline is located at the cable inlet of the focusing tube, and the outlet direction is the same as the cable conveying direction. This is used to form a laminar inert gas protective air curtain in the UV curing light source irradiation area to ensure that the curing area on the cable surface is in an oxygen-free environment throughout the process.
[0011] Furthermore, the pressure monitoring component includes at least two pressure sensors, one of which is located at the cable inlet of the curing chamber and the other at the cable outlet of the curing chamber. The pressure sensors are connected to the PLC control component of the production line, and the PLC control component is connected to the solenoid control valve. The PLC control component is used to adjust the opening of the solenoid control valve in a closed loop according to the real-time pressure value inside the curing chamber to maintain stable internal pressure and prevent pressure fluctuations from causing external air to seep in or excessive consumption of inert gas.
[0012] Furthermore, the sealing cable threading assembly includes a sealing seat, a multi-stage labyrinth seal, and an auxiliary air curtain nozzle. The sealing seat is fixed at the cable inlet and / or cable outlet of the curing chamber. The multi-stage labyrinth seal is nested in the central through hole of the sealing seat, and the central through hole is coaxially arranged with the cable conveying path. The auxiliary air curtain nozzle is located on the side of the sealing seat near the outside of the curing chamber, and the auxiliary air curtain nozzle is connected to the pressure stabilizing air supply assembly through a branch pipe. It is used to form an outward inert air curtain at the cable threading hole to prevent outside air from seeping into the interior of the curing chamber with the cable, while not contacting the cable surface to avoid scratching the uncured paint layer.
[0013] Furthermore, the circulating purification component includes a circulating fan, a dust removal unit, a deoxygenation unit, and a drying unit. The air inlet of the circulating fan is connected to the air outlet of the inner cavity of the curing chamber through a pipeline. The air outlet of the circulating fan is sequentially connected to the dust removal unit, the deoxygenation unit, and the drying unit. The air outlet of the drying unit is connected to the gas distribution pipeline of the pressure-stabilizing gas supply component through a return pipeline. The deoxygenation unit has a built-in palladium catalyst deoxygenator to remove trace amounts of oxygen from the circulating gas. The drying unit has a built-in molecular sieve adsorbent to remove moisture from the gas, preventing moisture from affecting the curing reaction and the performance of the paint layer.
[0014] Furthermore, the oxygen content monitoring device inside the curing chamber is connected to the PLC control component via signal transmission. The PLC control component has a preset oxygen content threshold. When the oxygen content in the chamber exceeds the threshold, the electromagnetic control valve is triggered to increase its opening and the circulating fan to increase its power until the oxygen content drops below the threshold, thereby realizing real-time monitoring and closed-loop control of the oxygen content.
[0015] Furthermore, the inner wall of the focusing tube is uniformly provided with inert gas guide grooves, the direction of which is consistent with the cable conveying direction, in order to guide the inert gas to flow evenly through the solidification area on the cable surface, so as to avoid oxygen residue caused by local airflow dead zones.
[0016] The curing chamber outlet is equipped with a segmented gradient constant temperature heating module coaxially arranged with the cable; the segmented gradient constant temperature heating module constructs a continuous linear temperature gradient field of 20℃ to 45℃±2℃ in the curing chamber along the cable conveying direction, wherein the section from the cable inlet end of the curing chamber to the middle section of the focusing tube is a low temperature deep curing zone of 20℃-35℃, and the section from the middle section of the focusing tube to the cable outlet end of the curing chamber is a heated surface curing zone of 35℃-45℃.
[0017] A manufacturing process for silk-insulated wire and cable with micro-positive pressure oxygen inhibition and polymerization prevention, used to realize the production line of silk-insulated wire and cable with micro-positive pressure oxygen inhibition and polymerization prevention, includes the following steps:
[0018] Step 1, Constant Speed and Constant Tension Wire Feeding and Straightening: The conductor coil to be processed is clamped in the wire feeding equipment. Automatic wire feeding is completed using a closed-loop tension control mode. The conductor conveying speed is set to 10-25m / min, and the wire feeding tension is stabilized synchronously to avoid tensile deformation or conveying vibration of the conductor. After wire feeding, the conductor enters the straightening equipment along a horizontal path. The opposing straightening roller group eliminates the bending deformation of the conductor. The conductor is kept at the same horizontal height throughout the conveying process, and the conveying speed is synchronized with the wire feeding speed in real time.
[0019] Step 2, Double-layer reverse insulation wrapping: The straightened conductor is horizontally inserted into the double-layer wrapping equipment. The inner and outer layers are wrapped in reverse to uniformly wrap the alkali-free insulating glass fiber on the outer surface of the conductor. The wrapping speed is synchronized with the wire release speed. The insulation layer thickness is controlled to be 0.02mm-0.4mm and the number of wrapping layers is 1-2 to obtain a uniformly wrapped wire blank.
[0020] Step 3, Controllable Single-Pass Insulation Varnish Dipping: The prepared wire blank enters the insulation varnish dipping unit while maintaining its original horizontal height. According to the material, wire diameter and insulation level requirements of the wire blank, the dipping length adjustment baffle is driven to move horizontally through the varnish dipping length precision adjustment mechanism, which precisely controls the dipping stroke of the cable in the closed varnish dipping tank. The temperature of the insulation varnish in the varnish dipping tank is controlled at 25℃-40℃ simultaneously, so that the single coating thickness of the insulation varnish reaches 0.04mm-0.1mm, completing the single dipping coating process.
[0021] Step 4: Micro-positive pressure oxygen-free environment full-circumferential light curing: After impregnation, the wire blank is kept at a constant horizontal height and enters the sealed curing chamber of the oxygen-free light curing unit through the cable threading sealing assembly. First, the cavity of the curing chamber is pre-filled with gas through the micro-positive pressure anti-oxygen polymerization system to build and maintain a high-purity inert gas micro-positive pressure environment with a gauge pressure of 100-500Pa, and control the oxygen content in the cavity to ≤50ppm. The UV curing light source with a four-point circumferential distribution in the focusing tube is activated to perform 360° full-circumferential continuous light curing on the wire blank. During the curing process, the pressure and oxygen content are controlled by a pressure closed-loop monitoring component, an online oxygen content monitor, and a PLC control system to achieve dual closed-loop control of pressure and oxygen content. Oxygen is completely isolated throughout the process to completely inhibit the oxygen inhibition effect of the light curing reaction. At the same time, the segmented gradient constant temperature heating module at the outlet of the curing chamber is activated to maintain the surface temperature of the cable at 45℃±2℃. The surface temperature is kept constant for the cable after deep light curing, eliminating the internal stress of the cured coating and promoting the full completion of the post-crosslinking reaction of the insulating varnish surface.
[0022] Step 5, Synchronous Constant Tension Winding and Forming: The cured silk-covered wire is horizontally output from the curing box through the cable threading sealing component. After the residual heat of curing is eliminated by air cooling, it is wound synchronously under constant tension by the synchronous winding unit. The winding speed and the unwinding speed are matched in real time, and the winding path and the unwinding path are kept at the same horizontal level, thus completing the entire production process of the silk-covered wire cable.
[0023] Furthermore, in step four, high-purity nitrogen gas with a purity of ≥99.99% is continuously supplied to the curing chamber through the pressure stabilizing gas supply component. Combined with the dual isolation structure of the multi-level labyrinth physical seal and the annular auxiliary air curtain seal of the sealing threading component, a micro-positive pressure environment of 100-500Pa is stably maintained in the curing chamber to prevent the infiltration of external air.
[0024] In step four, the inert gas in the curing chamber is subjected to closed-loop purification treatment of dust removal, oxygen removal and drying through the circulation purification component, and the purified gas is recycled back to the curing chamber to realize the recycling of inert gas.
[0025] Furthermore, in step four, the micro-positive pressure anti-oxidation and anti-polymerization system adopts a closed-loop control mode: the pressure value inside the curing chamber is collected in real time by a pressure sensor, and when the pressure value is lower than 100Pa, the PLC control component controls the electromagnetic control valve to increase the opening degree to replenish inert gas.
[0026] When the pressure value is higher than 500Pa, the PLC control component reduces the opening of the solenoid control valve and opens the return branch of the circulation purification component to maintain the pressure within the set range; at the same time, the oxygen content in the cavity is monitored in real time by the online oxygen content monitor. When the oxygen content exceeds 50ppm, the deoxygenation power of the circulation purification component and the amount of inert gas replenishment are increased until the oxygen content reaches the standard.
[0027] Beneficial effects
[0028] 1. This invention fundamentally solves the industry-wide problem of oxygen inhibition during the photocuring process. Through a micro-positive pressure oxygen inhibition system, a high-purity inert gas environment with a gauge pressure of 100-500 Pa is constructed and precisely maintained within a sealed curing chamber. This stably controls the oxygen content within the chamber to below 50 ppm, completely isolating oxygen from the cured coating. This allows the active free radicals generated by the photoinitiator to fully participate in the cross-linking polymerization reaction, avoiding surface curing inhibition and achieving complete deep curing of the insulating varnish coating. The significant increase in the cross-linking density of the cured coating brings a qualitative leap in the overall performance of the wire-insulated product: a substantial increase in insulation breakdown strength, a significant improvement in temperature resistance, a significant enhancement in wear resistance and resistance to damp heat aging, and a significantly extended product lifespan, meeting the stringent requirements of high-end electrical equipment.
[0029] 2. This invention optimizes the optical structure of photocuring, and adopts a UV curing light source with four points equidistantly distributed at 90° circumference on the inner wall of the focusing tube, which directly achieves uniform irradiation of the cable in 360° circumference without dead angles, ensuring the stability of curing uniformity during long-term production and avoiding product defects caused by uneven circumferential curing of the cable.
[0030] 3. This invention retains and strengthens the core advantages of continuous production of wire-insulated cables. From unwinding, straightening, wrapping, impregnation, curing, and rewinding, the entire process maintains a constant horizontal height without bending. This avoids damage to the glass fiber wrapping layer from bending stress and scratches on the uncured insulating varnish layer, ensuring performance consistency within and between batches. It also simplifies equipment layout, significantly reduces the production line footprint, and lowers equipment failure rates. Simultaneously, the precise impregnation length control mechanism allows for flexible and accurate adjustment of the cable impregnation stroke, adapting to the impregnation requirements of different materials and specifications of wire-insulated cables. Combined with precise control of the insulating varnish temperature and viscosity, a uniform coating thickness can be obtained with a single impregnation, significantly improving production efficiency and eliminating the cumbersome process and energy consumption of multiple coatings.
[0031] 4. This invention employs a dual closed-loop control mode for pressure and oxygen content, coupled with an inert gas closed-loop circulation and reuse system, achieving stable control of the oxygen-free environment and a significant reduction in operating costs. Through a high-precision pressure transmitter and a PLC central control system, the opening of the gas supply valve is dynamically adjusted in real time to maintain the pressure inside the chamber within the set range; an online oxygen content monitor enables real-time monitoring and dynamic adjustment of environmental purity; and a gas circulation and purification component continuously purifies and reuses the gas inside the chamber. Compared with the traditional open-loop nitrogen filling process, the consumption of high-purity inert gas is reduced by more than 70%, significantly reducing the long-term operating costs of the production line and perfectly adapting to the needs of large-scale industrial production requiring long-term continuous operation.
[0032] 5. An innovative solution addresses the core pain point of asynchronous curing between the inner and outer layers of insulating varnish. A segmented gradient constant-temperature heating module constructs a continuous temperature gradient field from 20℃ to 45℃. The low-temperature deep curing zone (20℃-35℃) slows down the cross-linking curing rate of the surface resin of the insulating varnish, preventing the premature formation of a dense cured film that hinders photon penetration. This ensures that UV light fully penetrates the gaps between the inner coating layer and the glass fibers, completing the full curing of both the inner and deep layers. The heated surface curing zone (35℃-45℃) enhances the activity of the surface resin molecular chains, promoting the full completion of the post-cross-linking reaction and completely solving the problems of surface stickiness and insufficient cross-linking density. Simultaneously, it effectively eliminates internal stress in the coating, balancing the deep curing degree and surface performance, further improving the overall performance and batch stability of the product. Attached Figure Description
[0033] Figure 1 This is a schematic diagram of the overall structure of the wire-insulated cable production line described in this invention;
[0034] Figure 2 This is a schematic diagram of the structure of the photocuring device described in this invention;
[0035] Figure 3 This is a schematic diagram of the reflector and guide channel inside the focusing tube according to the present invention;
[0036] Figure 4 This is a cross-sectional structural diagram of the sealing threading assembly described in this invention;
[0037] Figure 5 This is a schematic diagram showing the connection between the pressure-stabilizing gas supply component and the circulating purification component described in this invention.
[0038] 1. Wire feeding equipment; 11. Tension sensor; 2. Straightening equipment; 21. Straightening roller group; 3. Wrapping equipment; 31. Double-layer reverse wrapping machine; 4. Impregnation equipment; 41. Impregnation tank; 42. Paint circulation supply device; 421. Paint pump; 422. Drive paint storage cylinder; 43. Synchronous motor; 44. Lead screw; 45. Paint filter block; 5. UV curing equipment; 51. Curing chamber; 511. Concentrator; 512. Power supply compartment; 513. Light source mounting block; 514. UV curing light source; 515. Guide channel; 516. Segmented gradient constant temperature heating mold 52. Micro-positive pressure oxygen prevention and polymerization inhibition system; 53. Sealing and threading assembly; 531. Sealing seat; 532. Multi-stage labyrinth seal; 533. Auxiliary air curtain nozzle; 54. Inert gas source; 55. Pressure stabilizing gas supply assembly; 551. Pressure reducing valve; 552. Precision flow meter; 553. Electromagnetic control valve; 554. Pipeline check valve; 555. PLC control assembly; 56. Pressure monitoring assembly; 57. Circulation purification assembly; 571. Circulating fan; 572. Dust removal unit; 573. Deoxygenation unit; 574. Drying unit; 58. Online oxygen content monitor.
[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of protection of the invention. Equivalent substitutions, structural modifications, and parameter optimizations that can be conceived by those skilled in the art based on the disclosure of this invention without inventive effort all fall within the scope of protection of this invention. Detailed Implementation
[0040] Example 1
[0041] like Figure 1 As shown in the figure, the wire-insulated cable production line with micro-positive pressure anti-oxidation and polymerization inhibition described in this embodiment has a wire feeding device 1, a straightening device 2, a wrapping device 3, an impregnation device 4, a light curing device 5, and a winding device 6 arranged coaxially and at the same height along the cable conveying direction. The cable is conveyed at the same horizontal height from the wire feeding output to the winding, without any bending or twisting paths. This avoids stress damage to the glass fiber wrapping layer caused by multiple bends and drips and scratches to the uncured insulating varnish layer, ensuring the consistency of product structure and performance. It also simplifies the equipment layout, significantly shortens the length of the production line, and reduces the equipment failure rate.
[0042] The complete process flow is as follows:
[0043] Wire feeding process: The high-purity oxygen-free copper wire coil to be processed is installed on the wire feeding equipment 1. The wire feeding equipment 1 adopts an automatic wire feeding frame with tension closed-loop control. Automatic wire feeding is achieved through the wire feeding machine. The wire feeding speed can be precisely adjusted within the range of 20-25 meters / minute according to production needs. During the wire feeding process, the tension sensor 11 monitors and stabilizes the wire feeding tension in real time to avoid the wire from being stretched or deformed or shaking during wire feeding, thus providing a stable and straight conductor substrate for subsequent processes.
[0044] Straightening process: The wire output from the wire feeding device 1 enters the straightening device 2 horizontally. The straightening device 2 adopts two sets of horizontally opposed straightening roller groups 21. Through the extrusion and straightening of multiple sets of straightening rollers, the bending deformation of the wire during winding and transportation is eliminated. After straightening, the wire is kept at the same horizontal height as the wire feeding process throughout the process. The conveying speed is completely consistent with the wire feeding speed, ensuring that the wire is free from bending and twisting, providing a straight substrate for subsequent glass fiber wrapping, and avoiding uneven wrapping layer thickness due to wire bending.
[0045] Wrapping process: The straightened conductor is horizontally inserted into the wrapping device 3. The wrapping device 3 is a double-layer reverse wrapping machine 31. The alkali-free insulating glass fiber is evenly wrapped around the surface of the conductor through the wrapping device 3. During double-layer wrapping, the inner and outer layers are wrapped in opposite directions. The wrapping speed is synchronized with the wire release speed and can be adjusted within the range of 20-30 meters / minute. The coating thickness of the glass fiber can be adjusted within the range of 0.02mm-0.4mm according to the product insulation requirements. The number of wrapping layers can be set to 1-2 layers, and finally a wire blank with uniform structure and tight wrapping is obtained.
[0046] Impregnation process: The wrapped wire blank, kept at a constant horizontal level, directly enters the impregnation equipment 4 to complete the insulating varnish impregnation and coating. The impregnation equipment includes an impregnation tank 41, with a paint circulation supply device 42 at the bottom and an impregnation length adjustment device inside for precise adjustment of the cable impregnation length. The wire blank enters the impregnation tank 41 horizontally through the support wheels on both sides, first passing through the cable hole in the center of the adjustment plate into the impregnation chamber, which is filled with UV-curable insulating varnish. The wire blank is impregnated in the chamber, allowing the insulating varnish to fully penetrate the gaps in the glass fibers. A synchronous motor 43 drives a lead screw 44 to rotate, which can drive... The adjusting plate moves horizontally along the cable conveying direction, changing the length of the immersion chamber between the adjusting plate and the feed end of the immersion tank 41, thereby precisely controlling the immersion length of the cable in the immersion tank 41, adapting to the immersion time and coating thickness requirements of different materials and specifications of silk-covered wires; after immersion, the cable passes through the filter block 45, through which the excess paint on the surface of the cable is scraped and spread evenly in the circumference, avoiding uneven distribution of paint due to gravity, ensuring uniform coating thickness in the circumference of the cable, and finally completing a single immersion coating without the need for multiple coating processes.
[0047] During the impregnation process, the paint circulation supply device 42 drives the UV-cured insulating varnish in the paint storage tank 422 through the paint pump 421, and continuously feeds it into the impregnation tank 41 through the conduit and the first one-way valve. Excess paint overflowing from the impregnation tank 41 flows back to the conduit through the second one-way valve and finally back to the paint storage tank 422, forming a closed-loop circulation supply of insulating varnish. At the same time, the paint level is monitored in real time by the float and trigger rod in the contact cylinder. When the level drops to the set lower limit, the trigger rod triggers the bottom contact switch to start the paint pump to replenish the paint. When the level rises to the set upper limit, the top contact switch is triggered to shut down the paint pump, realizing automatic replenishment of paint without manual operation.
[0048] Photocuring process: The dipped wire blank is kept at a constant horizontal level and directly enters the photocuring equipment 5 to complete the curing and cross-linking of the insulating varnish. The photocuring equipment 5 integrates a micro-positive pressure oxygen-preventing polymerization system 52 and a segmented gradient constant temperature heating module 516. The wire blank enters the inner cavity of the curing chamber 51 through the sealed threading assembly 53. The curing chamber 51 is pre-constructed with a micro-positive pressure inert gas environment of 100-500 Pa gauge pressure by the micro-positive pressure oxygen-preventing polymerization system 52, and the oxygen content in the inner cavity is controlled below 50 ppm, thus fundamentally isolating oxygen from inhibiting the photocuring reaction. At the same time, the segmented gradient constant temperature heating module 516 is activated to construct a continuous linear temperature gradient field of 20℃ to 45℃±2℃ in the curing chamber. The wire blank enters the focusing tube 511 in the curing chamber 51. The UV light is distributed at four points on the inner side wall of the focusing tube 511. The curing light source 514 is activated simultaneously, emitting ultraviolet light to directly irradiate the cable surface in a 360° omnidirectional manner without dead angles. The cable first passes through a low-temperature deep curing zone of 20℃-35℃ to delay the cross-linking of the surface resin and ensure that UV photons can fully penetrate to complete the inner and deep curing. Then, it passes through a heated surface curing zone of 35℃-45℃ to promote the completion of the post-cross-linking reaction of the surface layer, achieving simultaneous and full curing of the inner and outer layers.
[0049] Winding process: The cured finished silk-covered wire and cable are output from the curing box 51 through the sealed threading assembly 58. After the residual heat of curing is quickly eliminated by the air cooling system, it enters the winding equipment 6 to complete the winding. The winding equipment 6 adopts a constant tension winding roller 61 driven by a servo motor. The winding speed and the unwinding speed are synchronized in real time. The winding position and the unwinding position are at the same height to ensure that the cable is conveyed horizontally without bending throughout the process. Finally, the processed silk-covered wire is evenly wound on the wire reel, completing the entire silk-covered wire and cable production process.
[0050] Example 2
[0051] like Figure 2-5 As shown in the figure, this embodiment elaborates on the structure and working process of the photocuring equipment with micro-positive pressure anti-oxidation and polymerization inhibition described in this invention. The photocuring equipment in this embodiment is seamlessly integrated into the wire and cable production line described in embodiment 1. It is set coaxially and at the same height as the discharge end of the impregnation equipment 4 and the feed end of the winding equipment 6 to ensure that the cable is transported horizontally without bending throughout the process.
[0052] The UV curing equipment 5 includes a curing chamber 51, a micro-positive pressure oxygen-preventing and polymerization-inhibiting system 52, and a sealed cable threading assembly 53. A focusing tube 511 is fixedly installed inside the curing chamber 51, and a power supply compartment 512 is fixedly installed on the top of the curing chamber 51. A light source mounting block 513 is fixed on the side wall of the curing chamber 51, and an array of heat dissipation vents are provided at the light source mounting block 513 for heat dissipation and cooling of the UV curing light source 514 during operation. A UV curing light source 514 is installed on the side of the light source mounting block 513 facing the central axis of the focusing tube 511. Four sets of UV curing light sources 514 are arranged in a four-point circumferential distribution at a 90° angle. The inner cavity of the focusing tube 511 is coaxially aligned with the cable delivery path, allowing the cable to pass through horizontally without bending. Through the four-point distributed UV curing light sources 514, the cable passing through the focusing tube 511 can be directly and uniformly irradiated in a 360° circumferential direction without dead angles, significantly improving light utilization and curing uniformity, while avoiding the defects of easy contamination and aging of reflectors.
[0053] Each of the focusing tubes 511 has inert gas guide channels 515 on its surface. The direction of the guide channels 515 is completely consistent with the cable conveying direction. The depth of the guide channels 515 is 0.5-1mm and the width is 2-3mm. The guide channels 515 can guide the inert gas to flow evenly and smoothly through the curing area of the cable surface, avoiding oxygen residue caused by local airflow dead zones, and ensuring that the utilization rate of UV light is not affected. Through the airflow guidance of the guide channels 515, a stable laminar inert gas protective air curtain can be formed in the curing light source irradiation area, so that the cable is surrounded by oxygen-free inert gas from the moment it enters the focusing tube 511, completely eliminating the influence of residual oxygen in the gaps between the glass fibers on the curing reaction.
[0054] The sealed cable assembly 53 includes a sealing seat 531, a multi-stage labyrinth seal 532, and an auxiliary air curtain nozzle 533. The sealing seat 531 is fixed to the cable inlet and / or cable outlet of the curing chamber 51 by a flange structure. The multi-stage labyrinth seal 532 is nested in the central through hole of the sealing seat 531, and the central through hole is coaxially arranged with the cable conveying path. The multi-stage labyrinth seal 532 is made of polytetrafluoroethylene with a low coefficient of friction. Its inner wall maintains a gap of 0.1-0.2mm with the cable, which will not scratch the uncured paint layer on the surface of the cable, and can form multi-stage air resistance through the labyrinth-type baffle structure, which greatly reduces the leakage of inert gas inside the chamber and prevents the infiltration of outside air. The auxiliary air curtain nozzles 533 are arranged in a ring array on the side of the sealing seat 531 near the outside of the curing chamber 51. The auxiliary air curtain nozzles 533 are connected to the pressure stabilizing air supply component 55 through a branch pipe. When working, they can spray out a ring-shaped outward inert air curtain to form a positive pressure barrier at the wire hole, which completely prevents the outside air from seeping into the interior of the curing chamber 51 with the cable, and further improves the sealing and isolation effect of the chamber.
[0055] The micro-positive pressure anti-oxidation and anti-polymerization system 52 includes an inert gas source 54, a pressure stabilizing gas supply component 55, a pressure monitoring component 56, and a circulation and purification component 57. The curing chamber 51 is a sealed chamber structure, welded from 304 stainless steel. All joints of the curing chamber 51 are equipped with high-temperature resistant silicone rubber sealing gaskets to ensure the overall airtightness of the curing chamber 51. The sealing cable threading component 53 is fixedly installed at the cable inlet and cable outlet of the curing chamber 51, and the central through hole of the sealing cable threading component 53 is coaxially arranged with the cable conveying path to ensure that the cable enters and exits the curing chamber 51 horizontally without bending.
[0056] The inert gas source 54 is connected to the inner cavity of the curing chamber 51 through the pressure stabilizing gas supply component 55, continuously providing high-purity inert gas to the inside of the curing chamber 51; the pressure monitoring component 56 is installed inside the curing chamber 51 and is connected to the pressure stabilizing gas supply component 55 to realize real-time monitoring and closed-loop control of the pressure inside the curing chamber 51; the inlet and outlet of the circulation purification component 57 are respectively connected to the inner cavity of the curing chamber 51 to form an inert gas closed-loop circulation circuit, realizing the recycling and purification of the gas.
[0057] In operation, the inner cavity of the curing chamber 51 is stably maintained at a micro-positive pressure inert gas environment of 100-500Pa gauge pressure by the micro-positive pressure oxygen-preventing and polymerization-inhibiting system 52. This pressure range can form an outward positive pressure barrier to completely prevent outside air from seeping into the chamber, and will not cause a large amount of inert gas leakage due to excessive pressure. At the same time, it will not cause any resistance to the horizontal transmission of cables, perfectly meeting the needs of continuous industrial production of wire-insulated cables.
[0058] The pressure-stabilizing gas supply assembly 55 includes a pressure reducing valve 551, a precision flow meter 552, an electromagnetic control valve 553, and a pipeline check valve 554 connected in sequence via pipelines. The inlet end of the pressure reducing valve 551 is connected to the inert gas source 54 to reduce the pressure of the inert gas in the high-pressure cylinder to a stable working pressure of 0.2-0.3 MPa. The precision flow meter 552 is used to monitor the gas flow rate in real time and accurately control the consumption of inert gas. The electromagnetic control valve 553 is a proportional regulating valve and is signal-connected to the PLC control assembly 555 of the production line to accurately adjust the gas opening. The outlet end of the pipeline check valve 554 is connected to the inner cavity of the curing chamber 51 via a gas distribution pipeline 556 to prevent the gas inside the chamber from flowing back and contaminating the high-purity gas source. The outlet of the gas distribution pipe 556 is located at the cable inlet end of the focusing tube 511, and the gas outlet direction is the same as the cable conveying direction. This can form a stable laminar inert gas protective air curtain in the curing light source irradiation area, further enhancing the oxygen-free curing environment.
[0059] The pressure monitoring component 56 includes two high-precision pressure sensors with a measurement accuracy of ±1Pa. One high-precision pressure sensor is fixedly installed at the cable inlet inside the curing chamber 51, and the other is fixedly installed at the cable outlet. It can monitor the pressure values at both ends inside the curing chamber 51 in real time to avoid pressure gradients inside the curing chamber 51. Both high-precision pressure sensors are connected to the PLC control component 555 of the production line. The PLC control component 555 has a preset pressure threshold range of 100-500Pa. When the real-time pressure inside the curing chamber 51 is lower than the lower limit of the threshold, the PLC control component 555 controls the solenoid control valve 553 to increase the opening and replenish inert gas. When the pressure is higher than the upper limit of the threshold, the opening of the solenoid control valve 553 is reduced to stop replenishing gas, thereby maintaining the internal pressure stable within the set range and realizing closed-loop precise pressure control.
[0060] The inner cavity of the curing chamber 51 is also equipped with a laser-type online oxygen content monitor 58, with a detection limit of 1 ppm. The online oxygen content monitor 58 is connected to the PLC control component 555, which has a preset oxygen content threshold of 50 ppm. When the oxygen content in the inner cavity exceeds the threshold, the PLC control component 555 triggers the electromagnetic control valve 553 to increase its opening, replenishing fresh high-purity nitrogen gas. At the same time, it increases the power of the circulating fan 571 to accelerate the circulation and purification speed until the oxygen content drops below the threshold, realizing real-time monitoring and closed-loop control of the oxygen content. The inner cavity of the cable outlet end of the curing chamber 51 is equipped with a segmented gradient constant temperature heating module 516, which is a multi-segmented annular low-power infrared heating ring group arranged coaxially with the cable. It is nested in the inner wall of the focusing tube 511 without contact and is located downstream of the irradiation range of the UV curing light source 514. The distance between the inner wall of the heating ring group and the outer wall of the cable is 5-10 mm, and it does not contact the cable surface throughout the process to avoid scratching the incompletely cured insulating varnish layer. The inner cavity of the curing chamber 51 is equipped with high-precision temperature sensors along the cable conveying direction, at the cable inlet, the middle section of the focusing tube 511, and the cable outlet. All temperature sensors and the segmented gradient constant temperature heating module 516 are connected to the PLC control component 555. The PLC control component 555 is preset with temperature gradient thresholds and interval temperature control parameters. It can adjust the output power of each segment of the heating module in a closed loop according to the real-time collected temperature data, and construct a continuous linear temperature gradient field from 20℃ (room temperature) to 45℃±2℃ along the cable conveying direction. The section from the cable inlet end of the curing chamber 51 to the middle section of the focusing tube 511 is a low-temperature deep curing zone of 20℃-35℃, and the section from the middle section of the focusing tube 511 to the cable outlet end is a heated surface curing zone of 35℃-45℃. The low-temperature deep curing zone slows down the cross-linking and curing rate of the surface resin of the insulating varnish by using a lower ambient temperature, preventing the surface resin from prematurely polymerizing to form a dense cured film. This ensures that the photons from the UV curing light source can fully penetrate the surface of the insulating varnish and reach deep into the gaps between the glass fibers and the inner layer of the insulating varnish, allowing the resin in the inner and deep layers of the coating to complete a full free radical polymerization and cross-linking reaction in a slightly positive pressure oxygen-free environment. The heated surface curing zone enhances the molecular chain activity of the surface resin of the insulating varnish through precise constant temperature control of 35℃-45℃, promoting the full completion of the post-cross-linking reaction of the surface resin, supplementing the surface curing degree under the oxygen-free curing environment, and effectively eliminating the internal stress caused by the difference in curing rates between the inner and outer layers of the coating, thus optimizing the overall performance of the coating.
[0061] The circulating purification component 57 includes a circulating fan 571, a dust removal unit 572, a deoxygenation unit 573, and a drying unit 574. The circulating fan 571 is a low-noise centrifugal fan, and its air inlet is connected to the air outlet of the inner cavity of the curing chamber 51 through a pipeline. The air outlet of the circulating fan 571 is connected to the dust removal unit 572, the deoxygenation unit 573, and the drying unit 574 in sequence. The air outlet of the drying unit 574 is connected to the air distribution pipeline of the pressure stabilizing gas supply component 57 through a return pipeline 575, forming a complete inert gas closed-loop circulation circuit. The dust removal unit 572 incorporates a high-precision PTFE filter bag to filter paint mist and dust entrained in the circulating gas, preventing contamination of the curing light source and reflector, and ensuring the lifespan and curing effect of the optical components. The deoxygenation unit 573 incorporates a palladium catalyst deoxidizer, which reacts trace amounts of oxygen and hydrogen in the circulating gas to generate water at room temperature, achieving an oxygen removal efficiency of 99.99% and reducing the oxygen content of the circulating gas to below 10 ppm. The drying unit 68 incorporates a 4A molecular sieve adsorbent to remove moisture from the gas, ensuring a relative humidity ≤30% RH within the curing chamber 51, preventing moisture from affecting the photocuring reaction and the insulation performance of the paint layer. The circulating purification component 57 enables closed-loop recycling of the inert gas inside the chamber, reducing high-purity gas consumption by more than 70% compared to traditional open-loop nitrogen filling processes, significantly lowering production line operating costs, while continuously purifying the gas environment inside the chamber to ensure stable curing reactions.
[0062] The micro-positive pressure photocuring process in this embodiment is as follows: Before the production line is started, the inner cavity of the curing chamber 51 is pre-filled and replaced by the micro-positive pressure anti-oxidation and polymerization inhibition system 52. The electromagnetic control valve 553 of the pressure stabilizing gas supply component 55 is opened, and high-purity nitrogen is sent into the curing chamber 51 through the pressure reducing valve 551, the precision flow meter 552, and the pipeline check valve 554 to replace and discharge the air in the curing chamber 51 until the oxygen content in the inner cavity of the curing chamber 51 drops below 50ppm. At the same time, the pressure in the inner cavity of the curing chamber 51 is stabilized within the set range of 100-500Pa gauge pressure, thus completing the pre-replacement process. After the production line is started, the wire blank coated by the dipping equipment 4 is kept at a constant horizontal height and enters the focusing tube 511 in the curing box 51 through the sealing wire threading assembly 53 at the entrance. The multi-level labyrinth seal 532 of the sealing wire threading assembly 53 forms the first physical seal, and the annular inert air curtain sprayed by the auxiliary air curtain nozzle 533 forms the second air curtain seal. The double seal completely prevents the outside air from seeping into the interior of the curing box 51 with the cable.
[0063] After the wire blank enters the focusing tube 511, the UV curing light source on the light source mounting block 513 is activated, and the emitted UV light irradiates the cable surface in segments and in the whole circumference, causing the insulating varnish to undergo a free radical polymerization reaction to complete the curing. At the same time, the gas distribution pipe of the voltage stabilizing gas supply component 55 continuously supplies inert gas into the focusing tube 511. The guide groove 515 on the surface of the focusing tube 511 guides the inert gas to flow evenly through the curing area on the cable surface, forming a laminar flow protective gas curtain, so that the cable curing process is completely enveloped in oxygen-free inert gas. During the curing process, the two high-precision pressure sensors of the pressure monitoring component 56 monitor the pressure values at both ends of the curing chamber 51 in real time and transmit the signals to the PLC control component 555. The PLC control component 555 adjusts the opening of the electromagnetic control valve 553 according to the real-time pressure closed loop to maintain the pressure inside the curing chamber 51 within the set range. The online oxygen content monitor 58 monitors the oxygen content inside the curing chamber 51 in real time. When the oxygen content exceeds the 50ppm threshold, it automatically increases the gas supply opening and increases the power of the circulating fan 571 to accelerate the gas circulation and purification speed until the oxygen content drops below the threshold.
[0064] The gas inside the curing chamber 51 is continuously extracted by the circulating fan 571 and sequentially sent to the dust removal unit 572, deoxygenation unit 573, and drying unit 574 for purification. This process removes paint mist, dust, trace amounts of oxygen, and moisture from the gas. The purified, dry, oxygen-free gas is then returned to the gas distribution pipeline via the return pipe 575 and recirculated back into the curing chamber 51. This ensures an oxygen-free environment inside the curing chamber 51 while significantly reducing the consumption of high-purity gas. Simultaneously, the segmented gradient constant temperature heating module 516 is activated to create a continuous temperature gradient field from 20°C to 45°C within the curing chamber. The cable first enters the low-temperature deep curing zone (20°C-35°C) to delay the cross-linking of the surface resin, ensuring that UV photons can fully penetrate the coating and complete the full curing of the inner and deep layers. Then, it enters the heated surface curing zone (35°C-45°C) to promote the full completion of the post-cross-linking reaction of the surface layer, achieving simultaneous and complete curing of the inner and outer layers of the insulating varnish coating. The cured silk-covered wire is horizontally output to the curing box 51 through the sealed threading assembly 53 at the outlet, and then enters the subsequent winding process, completing the entire micro-positive pressure oxygen-free photocuring process. In the free radical photocuring process, this embodiment isolates oxygen from the source through a micro-positive pressure inert gas environment, avoiding the reaction of oxygen with photo-induced active free radicals to generate stable peroxy free radicals, completely suppressing the oxygen inhibition effect, and allowing the cross-linking polymerization reaction of the insulating varnish to proceed fully. This solves the problems of coating surface stickiness, incomplete curing, and low cross-linking density in traditional photocuring processes, and significantly improves the insulation performance, temperature resistance, abrasion resistance, and aging resistance of the silk-covered wire products.
[0065] Example 3
[0066] This embodiment provides a production process for silk-insulated cables with micro-positive pressure oxygen-resistant polymerization inhibition, achieved using the above-mentioned production line. The specific production steps are as follows:
[0067] Step 1: Constant Speed and Constant Tension Wire Laying and Straightening: High-purity oxygen-free copper wire conductors are released from the coil and automatically laid out using laying equipment 1. The wire conveying speed is controlled at 20-25 meters per minute, and the laying tension is stably controlled within the range of 5-20N according to the wire diameter to ensure a smooth laying process without shaking or stretching deformation. The wires released during the laying process are straightened by horizontally arranged straightening equipment 2. The wire conveying process is kept at the same horizontal level as the laying step, and the conveying speed is completely consistent with the laying speed to ensure that the wires are not bent or twisted, providing a straight conductor substrate for the subsequent wrapping process.
[0068] Step 2: Double-layer reverse insulation wrapping: The straightened conductor is horizontally inserted into the double-layer wrapping device 3. The double-layer reverse wrapping machine 31 evenly wraps the alkali-free insulating glass fiber onto the surface of the conductor. During double-layer wrapping, the inner and outer layers are wrapped in opposite directions. The wrapping speed is synchronized with the wire release speed and controlled at 20-30 meters / minute. The glass fiber coating thickness is controlled at 0.02mm-0.4mm according to the product insulation requirements. The number of wrapping layers is set to 1-2 layers to obtain a wire blank with a uniform structure.
[0069] Step 3: Controllable Single-Pass Insulation Varnish Dipping: The wrapped wire blank enters the insulation varnish dipping unit while maintaining a constant horizontal height. Based on the wire blank's material, wire diameter, and insulation level requirements, the dipping length adjustment baffle is driven by synchronous motor 43 to adjust the immersion length of the cable in the sealed dipping tank 41, precisely controlling the dipping time and coating thickness. The temperature of the UV-cured insulation varnish in the dipping tank is maintained between 25℃ and 40℃ to ensure the varnish is in a stable viscous state. The varnish coating thickness is controlled between 0.04mm and 0.1mm, completing a single-pass dipping coating without the need for multiple coating processes.
[0070] Step 4: Gradient Temperature Controlled Micro-Positive Pressure Oxygen-Free Full-Circumference Curing: The dyed wire blank, kept at a constant horizontal height, enters the sealed curing chamber 51 of the UV curing equipment 5 through the cable threading sealing assembly 53. The curing chamber 51 is pre-constructed with a micro-positive pressure oxygen-inhibiting polymerization system 52, creating a micro-positive pressure high-purity nitrogen inert gas environment with a gauge pressure of 300 Pa, and the oxygen content inside is stably controlled at ≤50 ppm. The segmented gradient constant temperature heating module 516 is activated, creating a continuous linear temperature gradient field from 20℃ to 45℃ within the curing chamber 51. The temperature in the low-temperature deep curing zone is stabilized at 25℃-32℃, and the temperature in the heated surface curing zone is stabilized at 38℃-45℃. The wire blank receives UV light distributed at four points within the focusing tube 511 in the inert gas oxygen-free environment. The curing light source 514 provides circumferential irradiation using a 365nm wavelength UV-A ultraviolet light source. The light intensity of a single light source is controlled at 400mW / cm², and the irradiation time is controlled at 5 seconds. The cable first undergoes a low-temperature deep curing zone to achieve full cross-linking and curing of the inner and deep layers of the insulating varnish. Then, it undergoes a heated surface curing zone to achieve post-cross-linking and curing of the surface layer of the insulating varnish. The entire process is controlled by a PLC control component 555 to achieve three-loop control of pressure, oxygen content, and temperature gradient.
[0071] Step 5: Synchronous Constant Tension Winding and Forming: The cured silk-covered wire cable is output from the curing box 51 through the cable threading sealing component 53. After the residual heat of curing is quickly eliminated by the air cooling system, it is wound up by the winding device 6. The winding position and the unwinding position are kept at the same horizontal height. The winding speed and the unwinding speed are matched in real time. The winding tension is stably controlled within the range of 8-20N according to the cable specifications, and finally the entire process of silk-covered wire cable production is completed.
[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 production line for silk-insulated wire and cable with micro-positive pressure anti-oxidation polymerization, comprising a wire feeding device (1), a straightening device (2), a wrapping device (3), an impregnation device (4), a photocuring device (5), and a winding device (6) arranged sequentially along the wire conveying direction, characterized in that: The photocuring equipment (5) includes a curing chamber (51) with a sealed box structure. A focusing tube (511) is installed inside the curing chamber (51). Multiple sets of UV curing light sources (514) are evenly arranged along the circumference of the inner sidewall of the focusing tube (511) to achieve full circumferential light curing without dead angles for the cable passing through the focusing tube (511). The photocuring equipment (5) also includes a micro-positive pressure oxygen-preventing polymerization system (52); the micro-positive pressure oxygen-preventing polymerization system (52) includes an inert gas source (54), a pressure-stabilizing gas supply component (55), a sealing wiring component (53), a pressure monitoring component (56), and a circulation purification component (57). The sealing cable threading assembly (53) is installed at the cable inlet and cable outlet of the curing box (51). The inert gas source (54) is connected to the inner cavity of the curing box (51) through the pressure stabilizing gas supply assembly (55). The pressure monitoring assembly (56) is installed inside the curing box (51) and is connected to the pressure stabilizing gas supply assembly (55) via a signal. The inlet and outlet of the circulating purification assembly (57) are connected to the inner cavity of the curing box (51) respectively, forming an inert gas closed-loop circulation circuit. The inner cavity of the curing chamber (51) is maintained at a gauge pressure of 100-500Pa under working conditions by a micro-positive pressure oxygen inhibition system (52) to isolate the outside air and eliminate the oxygen inhibition effect of oxygen in the inner cavity of the curing chamber (51) on the photocuring reaction.
2. The production line for insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 1, characterized in that, The pressure-stabilizing gas supply assembly (55) includes a pressure reducing valve (551), a precision flow meter (552), an electromagnetic control valve (553), and a pipeline check valve (554) connected in sequence. The inlet of the pressure reducing valve (551) is connected to an inert gas source (54), and the outlet of the pipeline check valve (554) is connected to the inner cavity of the curing chamber (51) through a gas distribution pipeline (556). The outlet of the gas distribution pipeline (556) is located at the cable inlet of the focusing tube (511), and the outlet direction is the same as the cable conveying direction. It is used to form a laminar inert gas protective air curtain in the UV curing light source (514) irradiation area to ensure that the curing area on the cable surface is in an oxygen-free environment throughout the process.
3. The production line for silk-insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 2, characterized in that, The pressure monitoring component (56) includes at least two pressure sensors, one of which is located at the cable inlet of the curing chamber (51) and the other is located at the cable outlet of the curing chamber (51). The pressure sensors are connected to the PLC control component (555) of the production line, and the PLC control component (555) is connected to the solenoid control valve (553) to adjust the opening of the solenoid control valve (553) in a closed loop according to the real-time pressure value in the curing chamber (51) to maintain the pressure stability in the curing chamber (51).
4. The production line for insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 1, characterized in that, The sealing cable assembly (53) includes a sealing seat (531), a multi-stage labyrinth seal (532), and an auxiliary air curtain nozzle (533). The sealing seat (531) is fixed at the cable inlet and / or cable outlet of the curing box (51). The multi-stage labyrinth seal (532) is nested in the central through hole of the sealing seat (531), and the central through hole of the sealing seat (531) is coaxially arranged with the cable conveying path. The auxiliary air curtain nozzle (533) is located on the side of the sealing seat (531) near the outside of the curing box (51), and the auxiliary air curtain nozzle (533) is connected to the pressure stabilizing air supply component (55) through the branch pipe, which is used to form an outward inert air curtain at the wire hole to block the outside air from seeping in.
5. The production line for insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 3, characterized in that, The circulating purification component (57) includes a circulating fan (571), a dust removal unit (572), an oxygen removal unit (573), and a drying unit (574). The air inlet of the circulating fan (571) is connected to the air outlet of the inner cavity of the curing box (51) through a pipeline. The air outlet of the circulating fan (571) is connected to the dust removal unit (572), the oxygen removal unit (573), and the drying unit (574) in sequence. The air outlet of the drying unit (574) is connected to the air distribution pipeline (556) of the pressure stabilizing gas supply component (55) through a return pipeline. The oxygen removal unit (573) has a built-in palladium catalyst deoxidizer, and the drying unit (574) has a built-in molecular sieve adsorbent.
6. The production line for silk-insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 5, characterized in that, An online oxygen content monitor (58) is installed inside the curing chamber (51). The online oxygen content monitor (58) is connected to the PLC control component (555) via signal. The PLC control component (555) has a preset oxygen content threshold. When the oxygen content inside the curing chamber (51) exceeds the set threshold, the electromagnetic control valve (553) is triggered to increase its opening and the circulating fan (571) increases its power until the oxygen content drops below the threshold.
7. The production line for silk-insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition according to claim 1, characterized in that, The inner wall of the focusing tube (511) is uniformly provided with inert gas guide grooves (515), and the direction of the guide grooves (515) is consistent with the cable conveying direction, which is used to guide the inert gas to flow uniformly through the curing area on the surface of the cable. The outlet end of the curing box (51) is equipped with a segmented gradient constant temperature heating module (516) that is coaxially arranged with the cable; the segmented gradient constant temperature heating module (516) constructs a continuous linear temperature gradient field of 20℃ to 45℃±2℃ in the curing box (51) along the cable conveying direction. The section from the cable inlet end of the curing box (51) to the middle section of the focusing tube (511) is a low temperature deep curing zone of 20℃-35℃, and the section from the middle section of the focusing tube (511) to the cable outlet end of the curing box (51) is a heated surface curing zone of 35℃-45℃.
8. A manufacturing process for silk-insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition, characterized in that, The production line for manufacturing the silk-insulated wire and cable with micro-positive pressure oxygen-resistant polymerization inhibition as described in any one of claims 1-7 includes the following steps: Step 1, constant tension wire straightening: clamp the conductor coil in the wire feeding device (1), and perform automatic wire feeding in closed-loop tension control mode. Set the wire conveying speed to 20-25m / min, and synchronously stabilize the wire feeding tension to avoid the conductor from stretching or shaking during conveying. After wire feeding, the conductor enters the straightening device (2) along the horizontal path. The conductor bending deformation is eliminated by the opposing straightening roller group (21). The conductor is kept at the same horizontal height throughout the conveying process, and the conveying speed is synchronized with the wire feeding speed in real time. Step 2, Reverse Overlap Insulation Wrapping: The straightened conductor is horizontally inserted into the wrapping equipment (3). The inner and outer layers are wrapped in reverse to evenly wrap the insulating glass fiber on the outer surface of the conductor. The wrapping speed is synchronized with the wire release speed. The wrapping thickness is controlled to be 0.02mm-0.4mm and the number of wrapping layers is 1-2 layers to form the wire wrapping blank. Step 3, Precise and Controllable Single Dipping Coating: The wire blank is kept at its original horizontal height and enters the dipping equipment (4). According to the material, wire diameter and insulation performance requirements of the wire blank, the adjustment plate is driven to move through the adjustment device to precisely control the dipping length of the cable in the dipping tank (41). The paint temperature in the dipping tank (41) is controlled at 25℃-40℃ at the same time, so that the thickness of the insulation paint coating reaches 0.04mm-0.1mm in a single coating, and the single dipping coating is completed. Step 4: Gradient Temperature Controlled Micro-Positive Pressure Oxygen-Free Full-Circumference Curing: After impregnation, the coated wire is kept at a constant horizontal height and enters the sealed curing chamber (51) of the photocuring equipment (5) through the sealed wire threading assembly (53); first, the cavity inside the curing chamber (51) is pre-filled with gas through the micro-positive pressure anti-oxidation and polymerization inhibition system (52) to build and maintain a high-purity inert gas micro-positive pressure environment with a gauge pressure of 100-500Pa, and control the oxygen content in the cavity to ≤50ppm; then, the segmented gradient constant temperature heating module (516) is activated to build a continuous linear temperature range of 20℃ to 45℃±2℃ inside the curing chamber (51). Temperature gradient field; the UV curing light source (514) distributed in four points inside the focusing tube (511) is activated to perform full-circumferential continuous light curing on the cable. The cable first passes through the low temperature deep curing zone of 20℃-35℃ to complete the full cross-linking curing of the inner layer and deep layer of the insulating varnish, and then passes through the heated surface layer curing zone of 35℃-45℃ to complete the post-cross-linking curing of the surface layer of the insulating varnish. During the curing process, the pressure monitoring component (56), the oxygen content online monitoring instrument (58), the temperature sensor and the PLC control component (555) realize the three-closed-loop control of pressure, oxygen content and temperature gradient. Step 5, Constant Speed Synchronous Winding: After the cured silk-covered wire cable is horizontally output from the curing box (51) through the sealed wire threading assembly (53) to eliminate the residual heat of curing, it is wound synchronously under constant tension by the winding equipment (6). The winding speed is matched with the unwinding speed in real time, and the winding path and the unwinding path are kept at the same horizontal height.
9. The manufacturing process of the silk-insulated wire and cable with micro-positive pressure oxygen inhibition and polymerization prevention according to claim 8, characterized in that: In step four, high-purity nitrogen with a purity of ≥99.99% is continuously supplied to the curing chamber (51) through the pressure stabilizing gas supply component (55). Combined with the dual isolation structure of the multi-level labyrinth physical seal and the annular auxiliary air curtain seal of the sealing threading component (53), a micro-positive pressure environment of 100-500Pa is stably maintained in the curing chamber (51) to prevent the infiltration of external air. In step four, the inert gas in the curing chamber (51) is subjected to closed-loop purification treatment of dust removal, oxygen removal and drying by the circulating purification component (57), and the purified gas is recycled back to the curing chamber (51) to realize the recycling of inert gas.
10. The manufacturing process of the silk-insulated wire and cable with micro-positive pressure oxygen inhibition and polymerization prevention according to claim 8, characterized in that: In step four, the micro-positive pressure oxygen-preventing polymerization system (52) adopts a closed-loop control mode: the pressure value inside the curing chamber (51) is collected in real time by the pressure sensor. When the pressure value is lower than 100Pa, the PLC control component (555) controls the electromagnetic control valve (553) to increase the opening degree to replenish inert gas. When the pressure value is higher than 500Pa, the PLC control component (555) reduces the opening of the solenoid control valve (553) and opens the return branch of the circulation purification component (57) to maintain the pressure within the set range; at the same time, the oxygen content in the cavity is monitored in real time by the online oxygen content monitor (58). When the oxygen content exceeds 50ppm, the oxygen removal power and inert gas replenishment of the circulation purification component (57) are increased until the oxygen content reaches the standard.