A cross-linking reinforced cable and a steam cross-linking apparatus thereof

Abstract

This invention discloses a cross-linked reinforced cable and its steam cross-linking equipment. The cable comprises, from the inside out, a conductor, an insulation layer, a filler layer, an inner liner, double steel tape armor, and an outer sheath. The insulation layer is made of polyethylene insulation material, which is uniformly mixed from LLDPE 7042, LLDPE 8320, component B, and a cross-linking agent mixture. Component B is uniformly mixed from LLDPE 7042, LLDPE 8320, antioxidant A, antioxidant B, a special black masterbatch, an organotin catalyst, and fluororubber masterbatch. The cross-linking agent mixture is formulated from an initiator, antioxidant C, and silane. The steam cross-linking equipment includes an outer cross-linking box and a steam cross-linking device. The steam cross-linking device includes a pair of symmetrically distributed steam cross-linking mechanisms and a cross-linking drive mechanism. This invention has the advantages of low cost and improved cross-linking consistency.

Description

Technical Field

[0001] This invention relates to the field of cables, and in particular to a cross-linked reinforced cable and its steam cross-linking equipment. Background Technology

[0002] In the production of wires and cables, polyethylene insulation is widely used as the insulation layer. Existing polyethylene insulation materials are generally cross-linked using a two-step silane cross-linking method. This involves first producing component A (silane-grafted PE) containing silane graft groups and component B (catalyst masterbatch) containing a catalyst. Before cable production, components A and B are dry-mixed evenly and then melt-extruded onto the conductor in an extruder. The extruded cable also requires a warm water or steam bath to complete the final cross-linking. However, this processing method is extremely costly, has poor performance adjustability, is difficult to process, and the concentration of catalyst may cause localized over-cross-linking, leading to brittle points. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a cross-linked reinforced cable and its steam cross-linking equipment, which has the advantages of low cost and improved cross-linking consistency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A cross-linked reinforced cable includes, from the inside out, a conductor, an insulation layer, a filler layer, an inner liner, double steel tape armor, and an outer sheath; wherein the insulation layer is made of polyethylene insulation material; the polyethylene insulation material is uniformly mixed from LLDPE7042, LLDPE8320, component B, and a cross-linking agent mixture; wherein component B is uniformly mixed from LLDPE7042, LLDPE8322, antioxidant A, antioxidant B, a special black masterbatch, an organotin catalyst, and fluororubber masterbatch; the cross-linking agent mixture is formulated from an initiator, antioxidant C, and silane.

[0006] By adopting the above technical solutions, the use of unmodified, inexpensive resins LLDPE7042 and LLDPE8320 during the crosslinking process reduces formulation costs and improves economic efficiency. Adjusting the ratio of LLDPE7042 to LLDPE8320 allows for precise balance of the insulation layer's rigidity and flexibility. The addition of LLDPE7042 increases the overall melt index, reduces extruder torque, and lowers energy consumption. Furthermore, the narrow molecular weight distribution of LLDPE8320 improves melt strength and prevents sag in thin-walled insulation. The addition of the base resin enhances the blending effect, resulting in a more uniform distribution of silanes and catalysts and improved crosslinking consistency. Additionally, the speed and strength of the transformation of polyethylene molecules from a linear molecular structure to a three-dimensional network structure are improved, and the transformation from thermoplastic to thermosetting material is more pronounced. It does not decompose or carbonize below 300℃, has a long-term operating temperature of 90℃, and a thermal life of 40 years. Due to the establishment of new chemical bonds between macromolecules, the hardness, rigidity, wear resistance, and impact resistance of the cable insulation layer are all improved. Its combustion products are mainly water and carbon dioxide, posing minimal environmental harm.

[0007] Optionally, antioxidant A is antioxidant 1010; antioxidant B is antioxidant 168.

[0008] By adopting the above technical solution, the combination of antioxidant 1010 and antioxidant 168 simultaneously blocks the two key pathways of oxidation reaction (free radical generation + peroxide decomposition), increasing the antioxidant efficiency by 3 to 5 times compared to using 1010 or 168 alone; and improving long-term thermal stability.

[0009] Optionally, the silane is silane 171; the antioxidant C is antioxidant 300; and the initiator is initiator DCP.

[0010] By adopting the above technical solution, silane and DCP are dispersed at the nanoscale in PE melt, the grafting reaction sites are evenly distributed, the crosslinking degree fluctuation is reduced from ±15% to ±5%, and the electrical uniformity of the insulation layer is improved; antioxidant 300 preferentially removes oxidative free radicals without interfering with the active free radicals of DCP, protecting the PE molecular chain from breaking, while ensuring the grafting rate, and also providing long-term thermal stability.

[0011] A steam crosslinking device for crosslinked reinforced cables is used to crosslink the insulation layer of insulated wire cores output from an extruder. The insulation layer is made of polyethylene insulation material. The steam crosslinking device includes a main crosslinking machine. The main crosslinking machine includes:

[0012] External cross-linking box, used for horizontal passage of insulated wire cores;

[0013] A steam crosslinking device, located inside an outer crosslinking box, includes a pair of symmetrically distributed steam crosslinking mechanisms and a crosslinking drive mechanism. Each steam crosslinking mechanism includes a synchronous belt conveyor assembly, several steam hoods, and a steam assembly. The synchronous belt conveyor assembly includes a conveying synchronous belt. The crosslinking drive mechanism drives the pair of conveying synchronous belts to move synchronously and in the same direction. The steam hoods are uniformly arranged along the outer surface of the conveying synchronous belts. A semi-cylindrical crosslinking cavity is formed on the end face of the steam hood away from the conveying synchronous belt. Several circumferentially evenly distributed steam nozzles are formed on the cylindrical surface of the crosslinking cavity. The steam assembly provides steam to the steam nozzles. The crosslinking cavities of the steam hoods of the pair of steam crosslinking mechanisms, located close to each other, form a cylindrical crosslinking cavity. The crosslinking cavity is coaxially arranged with the insulated wire core. The moving speed of the steam hoods is the same as the conveying speed of the insulated wire core.

[0014] By adopting the above technical solution, the insulated wire core coaxially passes through the cross-linking chamber composed of cross-linking grooves of several steam hoods during horizontal transport. During this process, the steam hoods, which move in the same direction as the insulated wire core, spray steam from their steam nozzles to achieve cross-linking. Since the moving speed of the steam hoods is the same as the transport speed of the insulated wire core, the same position of the insulated wire core is always in contact with the steam sprayed from the steam nozzle of the same steam hood to achieve cross-linking. This is more efficient and effective than the insulated wire core passively contacting the steam as it passes horizontally through the steam chamber. At the same time, the same position of the insulated wire core will not experience steam of different temperatures, which is beneficial to the uniformity of cross-linking.

[0015] Optionally, the steam ejected through the steam nozzle covers the entire outer surface of the insulated wire core.

[0016] By adopting the above technical solution, the insulation layer of the insulated wire core is heated by steam instead of by its own heat conduction, which results in better cross-linking efficiency and effect.

[0017] Optionally, the steam assembly includes a steam chamber; the steam chamber is connected to an external steam generator; the steam chamber is a cuboid box with openings at one end of each pair of steam chambers that are close to each other; the end face of the steam hood that forms the crosslinking cavity away from the crosslinking cavity groove is on the same horizontal plane as the end face of the steam chamber facing the steam hood.

[0018] By adopting the above technical solution, the end face of the steam hood seat that is away from the crosslinking cavity groove and the end face of the steam chamber facing the steam hood seat are on the same horizontal plane. This makes the position of the steam hood seat at the opening of the steam chamber more stable, which is conducive to the subsequent steam entering the steam nozzle; at the same time, it is also conducive to improving the sealing performance at the opening of the steam chamber.

[0019] Optionally, a rectangular frame-shaped sealing ring is installed on the end face of the steam chamber facing the steam hood.

[0020] By adopting the above technical solution, the sealing of the end face of the steam chamber facing the steam hood improves the sealing between the steam hoods, reduces accidental steam leakage, and achieves energy saving.

[0021] Optionally, a horizontal guide is provided inside the outer crosslinking box; the horizontal guide is used at least for horizontal guiding and limiting of the steam hood seat that makes up the crosslinking cavity.

[0022] By adopting the above technical solution, the horizontal guide makes the horizontal movement of the steam hood that makes up the crosslinking chamber more stable, which results in a better sealing fit with the steam chamber, reduces the accidental outflow of steam, achieves energy saving, and at the same time prevents the steam hood from accidentally hitting the outer crosslinking box.

[0023] Optionally, the steam crosslinking equipment includes a pretreatment mechanism; the pretreatment mechanism is located at the front end of the main crosslinking machine along the conveying direction of the insulated wire core; the pretreatment mechanism includes an inner bath, an outer bath, and a hot water circulation assembly; the insulated wire core passes horizontally through the inner bath and the outer bath; the outer bath is connected to the outer crosslinking box of the main crosslinking machine; the inner bath is located inside the outer bath; a heating element is provided inside the inner bath; the inner bath is filled with hot water; the hot water circulation assembly is used to draw the hot water in the outer bath back into the inner bath.

[0024] By adopting the above technical solution, before the insulated wire core enters the main crosslinking machine, the insulated wire core passes horizontally through the outer bath and the inner bath. The inner bath is filled with hot water, which can achieve pre-crosslinking and improve the efficiency of subsequent crosslinking. At the same time, the water in the inner bath flows into the outer bath through the inlet and outlet for the insulated wire core, and then the hot water circulation component draws the water in the outer bath back into the inner bath. This keeps the hot water in the inner bath full, which is beneficial to the crosslinking of the insulated wire core.

[0025] Optionally, the steam crosslinking equipment further includes a post-treatment mechanism; the post-treatment mechanism is located at the rear end of the main crosslinking machine along the direction of conveying the insulated wire core; the structures of the post-treatment mechanism and the pre-treatment mechanism are symmetrically arranged relative to the main crosslinking machine.

[0026] By adopting the above technical solution, the working principle of the post-processing mechanism is the same as that of the pre-processing mechanism. The insulated wire core flows out through the post-processing mechanism after passing through the main cross-linking machine, which can avoid the effect of cross-linking due to excessive temperature change of the insulated wire core. Attached Figure Description

[0027] Figure 1 This is a frontal structural schematic diagram of the present invention.

[0028] Figure 2 This is a cross-sectional structural schematic diagram of the steam cross-linking device of the present invention.

[0029] Figure 3 This is a cross-sectional structural schematic diagram of the pretreatment mechanism of the present invention.

[0030] Figure 4 This is the invention Figure 3 A schematic diagram of the cross-section of AA.

[0031] Figure 5 This is a cross-sectional structural schematic diagram of the main cross-linking machine of the present invention.

[0032] Figure 6 This is the invention Figure 5 A schematic diagram of the cross-sectional structure of the steam cross-linking mechanism.

[0033] Figure 7 This is the invention Figure 5 A schematic diagram of the cross-section of BB.

[0034] Figure 8 This is the invention Figure 5 A schematic diagram of the cross-section of CC.

[0035] Figure 9 This is the invention Figure 8 A partially enlarged structural diagram of D.

[0036] Figure 10 This is a cross-sectional structural schematic diagram of the post-processing mechanism of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Extruder;

[0039] 20. Pretreatment mechanism; 21. Pretreatment tank; 210. Front inlet; 211. Front outlet; 212. Second support leg; 22. Horizontal collar; 23. Outer bath tube; 230. Outer inlet; 231. Outer outlet; 232. Outer connecting rod; 24. Inner bath tube; 240. Inner inlet; 241. Inner outlet; 242. Inner connecting rod; 25. Lower outlet pipe; 26. Circulating water pipe; 27. Upper inlet pipe; 28. Circulating water pump;

[0040] 30. Main crosslinking machine; 31. Outer crosslinking box; 310. Main feed inlet; 311. Main discharge outlet; 312. First support leg; 32. Synchronous belt conveyor assembly; 321. Conveyor synchronous shaft; 322. Conveyor synchronous pulley; 323. Conveyor synchronous belt; 33. Steam chamber; 331. Sealing ring; 332. Steam inlet pipe; 34. Steam hood; 340. Roller groove; 341. Crosslinking chamber groove; 342. Steam inlet; 343. Steam guide port; 344. Steam nozzle; 345. Central protrusion; 35. Crosslinking drive motor; 36. Transmission gear; 37. Guide seat; 371. Roller;

[0041] 40. Post-processing unit;

[0042] 50. Wire;

[0043] 60. Insulated wire core. Detailed Implementation

[0044] The following is in conjunction with the appendix Figures 1-10 The present invention will be described in further detail below.

[0045] This application discloses a cross-linked reinforced cable, comprising, from the inside out, a conductor, an insulation layer, a filler layer, an inner liner, double steel tape armor, and an outer sheath; wherein the insulation layer is made of polyethylene insulation material; the polyethylene insulation material is uniformly mixed from LLDPE7042, LLDPE8320, component B, and a cross-linking agent mixture; wherein component B is uniformly mixed from LLDPE7042, LLDPE8322, antioxidant A, antioxidant B, a special black masterbatch, an organotin catalyst, and fluororubber masterbatch; the cross-linking agent mixture is formulated from an initiator, antioxidant C, and silane; antioxidant A is antioxidant 1010; antioxidant B is antioxidant 168; silane is silane 171; antioxidant C is antioxidant 300; and the initiator is initiator DCP.

[0046] During the crosslinking process, the use of unmodified, inexpensive resins LLDPE7042 and LLDPE8320 reduces formulation costs and improves economic efficiency. Adjusting the ratio of LLDPE7042 to LLDPE8320 allows for precise balance of the insulation layer's rigidity and flexibility. The addition of LLDPE7042 increases the overall melt index, reduces extruder torque, and lowers energy consumption. Furthermore, the narrow molecular weight distribution of LLDPE8320 improves melt strength and prevents sag in thin-walled insulation. The addition of the base resin enhances the blending effect, resulting in a more uniform distribution of silanes and catalysts and improved crosslinking consistency. Additionally, the transformation of polyethylene molecules from a linear molecular structure to a three-dimensional network structure is accelerated and strengthened, resulting in a more pronounced transition from thermoplastic to thermosetting materials. It does not decompose or carbonize below 300℃, has a long-term operating temperature of 90℃, and a thermal life of up to 40 years. Due to the establishment of new chemical bonds between macromolecules, the hardness, rigidity, abrasion resistance, and impact resistance of the cable insulation layer are all improved. Its combustion products are mainly water and carbon dioxide, posing minimal environmental harm.

[0047] When working, refer to Figure 1 As shown, one end of the conductor 50 is placed on the unwinding device (not shown), then passes through the extruder 10 and the steam crosslinking device in sequence, and finally is wound on the winding device (not shown); the polyethylene insulation material is extruded by the extruder 10 to wrap around the conductor 50 to form the insulated core 60, and then the insulation core 60 is crosslinked by the steam crosslinking device.

[0048] refer to Figure 1 and Figure 2 The steam crosslinking equipment includes a main crosslinking machine 30; the main crosslinking machine 30 includes an outer crosslinking chamber 31 and a steam crosslinking device; the steam crosslinking device is installed inside the outer crosslinking chamber 31. (Reference) Figure 5 The outer crosslinking box 31 is a rectangular box with several first support feet 312 fixed on its bottom surface; the outer crosslinking box 31 has a main feed port 310 formed on the side wall near the extruder 10 and a main discharge port 311 formed on the side wall away from the extruder 10; the insulated wire core 60 passes horizontally through the main feed port 310, the steam crosslinking device and the main discharge port 311 in sequence.

[0049] refer to Figures 5-9The steam crosslinking device includes a pair of symmetrically distributed steam crosslinking mechanisms and a crosslinking drive mechanism. The steam crosslinking mechanism includes a synchronous belt conveyor assembly 32, several steam hoods 34, and a steam assembly. The synchronous belt conveyor assembly 32 includes a pair of synchronous conveyor belts 323, two pairs of synchronous conveyor pulleys 322, and a pair of synchronous conveyor shafts 321. The pair of synchronous conveyor shafts 321 are horizontally distributed and rotatably connected between a pair of opposing vertical sidewalls of the outer crosslinking box 31 via bearings. The axial direction of the synchronous conveyor shafts 321 is perpendicular to the conveying direction of the insulated wire core 60. The pair of synchronous conveyor pulleys 322 are coaxially fixed at both ends of the same synchronous conveyor shaft 321. The synchronous conveyor belts 323 are installed between the pair of synchronous pulleys 322. The vertical symmetrical plane of the synchronous conveyor belts 323 is parallel to the conveying direction of the insulated wire core 60. The crosslinking drive mechanism includes a crosslinking drive motor 35 fixed to the outer end face of the outer crosslinking box 31. A pair of transmission gears 36 are provided; the output shaft of the crosslinking drive motor 35 is coaxially connected to one of the conveying synchronous shafts 321; the pair of transmission gears 36 are coaxially fixed to the outer ends of the pair of vertically distributed conveying synchronous shafts 321 and mesh with each other; in this way, the crosslinking drive motor 35 drives the conveying synchronous shaft 321 connected to it to rotate, thereby driving the pair of conveying synchronous pulleys 322 on it to rotate, thus driving the pair of conveying synchronous belts 323 of the steam crosslinking mechanism to rotate synchronously. Due to the presence of the pair of transmission gears 36, the pair of conveying synchronous belts 323 of the other steam crosslinking mechanism also rotate synchronously. At this time, the two upper conveying synchronous belts 323 and the two lower conveying synchronous belts 323 move synchronously and at the same speed, that is, the horizontal parts of the two upper conveying synchronous belts 323 and the two lower conveying synchronous belts 323 that are close to each other move in the same direction and at the same speed. At the same time, the conveying direction and conveying speed of the insulated wire core 60 are also the same.

[0050] refer to Figures 5-9 A number of steam hoods 34 are evenly arranged on the outer surfaces of a pair of conveyor belts 323 on the upper and lower sides. The length direction of the steam hoods 34 is perpendicular to the conveying direction of the insulated wire core 60. The middle of both ends of the steam hoods 34 in the length direction is fixed on the outer surfaces of the pair of conveyor belts 323 on the upper side or the pair of conveyor belts 323 on the lower side.

[0051] refer to Figures 7-9A semi-cylindrical crosslinking cavity 341 is formed in the middle of the end face of the steam hood 34 away from the conveying synchronous belt 323. The crosslinking cavity 341 of a pair of steam crosslinking mechanisms close to each other form a cylindrical crosslinking cavity, and the insulated wire core 60 is coaxially arranged with the crosslinking cavity. Several circumferentially evenly distributed steam nozzles 344 are formed on the cylindrical surface of the crosslinking cavity 341. In order to increase the steam injection range, the steam nozzles 344 are flared with a larger outer diameter and a smaller inner diameter. In this way, the steam ejected through the steam nozzles 344 covers the entire outer surface of the insulated wire core 60. That is, the coverage range of the steam nozzles 344 on the same circumference in the circumferential direction of the insulated wire core 60 overlaps or intersects with each other, and the coverage range of adjacent steam nozzles 344 in the axial direction of the insulated wire core 60 overlaps or intersects with each other. In order to achieve the above purpose, two or more rings of steam nozzles 344 can be provided in the axial direction of the same steam hood 34. To reduce the impact of end face machining accuracy, the middle part of the end face of the steam hood 34 where the crosslinking cavity groove 341 is located protrudes outward to form a central protrusion 345. In this way, only the end face of the central protrusion 345 needs to be precision machined during processing, which greatly reduces the processing cost.

[0052] refer to Figures 7-9 The steam assembly includes a steam chamber 33; the steam chamber 33 is a rectangular box with openings at the ends of a pair of steam chambers 33 that are close to each other; the steam chamber 33 is located between a pair of synchronous conveyor belts 323; several horizontally arranged steam inlet pipes 332 are fixed on a pair of opposite vertical end faces of the steam chamber 33; the steam inlet pipes 332 pass horizontally through and are fixed to the sidewalls of the corresponding sides of the outer crosslinking box 31, and the end of the steam inlet pipe 332 away from the steam chamber 33 is connected to an external steam generator (not shown). During operation, the steam generated by the external steam generator (not shown) enters the steam chamber 33 through the steam inlet pipes 332 and then enters the steam nozzle 344.

[0053] refer to Figures 7-9 To reduce the resistance of steam entering the steam nozzle 344, a U-shaped steam inlet 342 is formed on the end face of the steam hood 34 away from the crosslinking cavity 341; the crosslinking cavity 341 is located inside the opening of the steam inlet 342; both ends of the steam inlet 342 penetrate the steam hood 34; the steam nozzle 344 is connected to the steam inlet 342; in other embodiments, the end of the steam inlet 342 away from the steam chamber 33 can also be closed; to further reduce the resistance of steam entering the steam nozzle 344, the end of the steam inlet 342 away from the crosslinking cavity 341 is set as a funnel-shaped steam guide port 343 with a larger outer diameter and a smaller inner diameter.

[0054] refer to Figures 7-9The end face of the steam hood 34, which forms the crosslinking chamber, away from the crosslinking chamber groove 341, is on the same horizontal plane as the end face of the steam chamber 33 facing the steam hood 34. To further improve the sealing performance of the steam chamber 33, a rectangular frame-shaped sealing ring 331 is installed on the end face of the steam chamber 33 facing the steam hood 34. To improve the accuracy of the horizontal movement of the steam hood 34 forming the crosslinking chamber, a horizontal guide is provided inside the outer crosslinking box 31. The horizontal guide includes a pair of guide seats 37 horizontally fixed on the inner side wall of the outer crosslinking box 31. Several horizontally arranged rollers 371 are rotatably connected to the inner end face of the guide seats 37. Roller grooves 340 that mate with the rollers 371 are formed at both ends of the steam hood 34 along its length direction. In this way, when the steam hood 34 moves to the opening side of the steam chamber 33 and begins to move horizontally, the rollers 371 enter the roller grooves 340 of the steam hood 34, thereby ensuring that the steam hood 34 moves on a horizontal line. In other embodiments, horizontal guides may also be provided on the upper and lower sides of a pair of synchronous belt conveyor assemblies 32, so that when the steam hood 34 reaches the side away from the opening of the steam chamber 33, the roller 371 on the corresponding side enters the roller groove 340 of the steam hood 34 to ensure that the steam hood 34 moves on a horizontal line.

[0055] In order to preheat the insulated wire core 60 before it enters the main crosslinking machine 30, thereby improving the crosslinking effect of the main crosslinking machine 30, a pretreatment mechanism 20 is provided at the front end of the main crosslinking machine 30 along the conveying direction of the insulated wire core 60.

[0056] refer to Figures 2-4The pretreatment mechanism 20 includes a rectangular box-shaped pretreatment box 21, an inner bath 24, an outer bath 23, and a hot water circulation assembly; the pretreatment box 21 has a front inlet 210 formed on the side wall away from the main crosslinking machine 30 and a front outlet 211 formed on the side wall close to the main crosslinking machine 30; a number of second support feet 212 are fixed at the bottom of the pretreatment box 21; the front inlet 210 and the front outlet 211 are horizontally coaxially arranged, and the front outlet 211 is connected to the main feed port 310 of the outer crosslinking box 31. Both the inner bath 24 and the outer bath 23 are hollow cylinders. The inner bath 24 is coaxially arranged inside the outer bath 23. The outer bath 23 has an outer inlet 230 formed on its side wall away from the main crosslinking machine 30 and an outer outlet 231 formed on its side wall near the main crosslinking machine 30. The bottom of the outer bath 23 is fixed to the bottom of the pretreatment box 21 by several external connecting rods 232. The inner bath 24 has an inner inlet 240 formed on its side wall away from the main crosslinking machine 30 and an outer outlet 231 formed on its side wall near the main crosslinking machine 30. An inner outlet 241 is formed on the side wall of the crosslinking machine 30; the bottom of the inner bath 24 is fixed to the bottom of the outer bath 23 by several inner connecting rods 242; the front inlet 210, the outer inlet 230, the inner inlet 240, the inner outlet 241 and the outer outlet 231 are coaxially arranged; the outer outlet 231 is connected to the front outlet 211; the inner bath 24 is filled with hot water, and in order to control the temperature of the hot water in the inner bath 24, a heating element and a temperature sensor are installed inside the inner bath 24.

[0057] refer to Figures 2-4 The hot water circulation assembly includes a lower outlet pipe 25 fixed to the bottom of the outer bath 23, an upper inlet pipe 27 fixed to the top of the inner bath 24, a rectangular frame-shaped circulating water pipe 26, and a pair of circulating water pumps 28. The lower end of the lower outlet pipe 25 is connected to the middle of the horizontal section of the lower side of the circulating water pipe 26. The upper end of the upper inlet pipe 27 passes vertically through the outer bath 23 and is connected to the middle of the horizontal section of the upper side of the circulating water pipe 26. The pair of circulating water pumps 28 are respectively fixed on a pair of vertical sections of the circulating water pipe 26. During operation, the pair of circulating water pumps 28 are started, and the hot water in the outer bath 23 enters the inner bath 24 in sequence through the lower outlet pipe 25, the circulating water pipe 26, and the upper inlet pipe 27. During operation, the insulated wire core 60 passes through the front inlet 210, the front outlet 211, the inner inlet 240, the inner outlet 241, and the outer outlet 231 in sequence, and is preheated and cross-linked in the inner inlet 240. In order to concentrate the discharged heat and reduce waste, a horizontal ring 22 in the shape of a cylindrical ring coaxial with the front inlet 210 is connected between the end face of the outer bath cylinder 23 away from the main crosslinking machine 30 and the vertical side wall of the pretreatment box 21. In this way, the heat dissipated from the outer inlet 230 will be concentrated on the horizontal ring, so as to heat the insulated wire core 60 passing through the horizontal ring 22. In order to better recover heat, fins can be provided on the horizontal ring 22.

[0058] To prevent the insulated wire core 60 from cooling too quickly after leaving the main crosslinking machine 30, refer to... Figure 1 , Figure 2 and Figure 10 A post-processing mechanism 20 is provided at the rear end of the main cross-linking machine 30 along the conveying direction of the insulated wire core 60; the structures of the post-processing mechanism 40 and the pre-processing mechanism 20 are symmetrically arranged relative to the main cross-linking machine 30; at this time, the front outlet 211 of the post-processing mechanism 40 is connected to the main discharge port 311 of the outer cross-linking box 31.

[0059] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A steam crosslinking device for crosslinking reinforced cables, used to crosslink the insulation layer of insulated cores (60) output from an extruder (10), the insulation layer being made of polyethylene insulating material; characterized in that: The steam crosslinking equipment includes a main crosslinking machine (30); the main crosslinking machine (30) includes: an outer crosslinking box (31) for the insulated wire core (60) to pass horizontally through; a steam crosslinking device located inside the outer crosslinking box (31), including a pair of symmetrically distributed steam crosslinking mechanisms and a crosslinking drive mechanism; the steam crosslinking mechanism includes a synchronous belt conveyor assembly (32), several steam hoods (34) and a steam assembly; the synchronous belt conveyor assembly (32) includes a conveying synchronous belt (323); the crosslinking drive mechanism drives a pair of conveying synchronous belts (323) to move synchronously and in the same direction; the steam hoods (34) are evenly arranged along the outer surface of the conveying synchronous belts (323); the steam hoods (34) are located away from the conveying synchronous belts (323) A semi-cylindrical crosslinking cavity (341) is formed on the end face of the 323; a plurality of circumferentially evenly distributed steam nozzles (344) are formed on the cylindrical surface of the crosslinking cavity (341); the steam assembly is used to supply steam to the steam nozzles (344); the crosslinking cavity (341) of a pair of steam crosslinking mechanisms close to each other forms a cylindrical crosslinking cavity; the crosslinking cavity is coaxially arranged with the insulated wire core (60); the moving speed of the steam hood (34) is the same as the conveying speed of the insulated wire core (60).

2. The steam crosslinking equipment for a crosslinked reinforced cable according to claim 1, characterized in that: Steam ejected through the steam nozzle (344) covers the entire outer surface of the insulated wire core (60).

3. A steam crosslinking apparatus for crosslinking and reinforcing cables according to claim 1, characterized in that: The steam assembly includes a steam chamber (33); the steam chamber (33) is connected to an external steam generator; the steam chamber (33) is a rectangular box and a pair of steam chambers (33) are respectively opened at one end close to each other; The end face of the steam hood (34) that forms the crosslinking cavity away from the crosslinking cavity groove (341) is on the same horizontal plane as the end face of the steam chamber (33) facing the steam hood (34).

4. A steam crosslinking apparatus for crosslinking and reinforcing cables according to claim 3, characterized in that: A rectangular frame-shaped sealing ring (331) is installed on the end face of the steam chamber (33) facing the steam hood (34).

5. A steam crosslinking apparatus for crosslinking and reinforcing cables according to claim 3, characterized in that: A horizontal guide is provided inside the outer crosslinking box (31); the horizontal guide is used at least for the horizontal guiding and limiting of the steam hood (34) that makes up the crosslinking cavity.

6. A steam crosslinking apparatus for crosslinked reinforced cables according to claim 1, characterized in that: The steam crosslinking equipment includes a pretreatment mechanism (20); the pretreatment mechanism (20) is located at the front end of the main crosslinking machine (30) along the conveying direction of the insulated core (60); the pretreatment mechanism (20) includes an inner bath (24), an outer bath (23) and a hot water circulation assembly; the insulated core (60) passes horizontally through the inner bath (24) and the outer bath (23); the outer bath (23) is connected to the outer crosslinking box (31) of the main crosslinking machine (30); the inner bath (24) is located inside the outer bath (23); a heating element is provided inside the inner bath (24); the inner bath (24) is filled with hot water; the hot water circulation assembly is used to draw the hot water in the outer bath (23) back into the inner bath (24).

7. A steam crosslinking apparatus for crosslinking and reinforcing cables according to claim 6, characterized in that: The steam crosslinking equipment also includes a post-processing mechanism (40); the post-processing mechanism (40) is located at the rear end of the main crosslinking machine (30) along the conveying direction of the insulated wire core (60); the structures of the post-processing mechanism (40) and the pre-processing mechanism (20) are symmetrically arranged relative to the main crosslinking machine (30).

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