Waterproof photovoltaic cables for centralized photovoltaic power plants and their manufacturing methods

Abstract

This invention relates to the field of cable manufacturing technology, and discloses a waterproof photovoltaic cable for centralized photovoltaic power stations and its manufacturing method. The key technical points are: a waterproof photovoltaic cable comprising: a conductor, an insulation layer wrapped around the conductor, a buffer layer covering the insulation layer, a waterproof layer outside the buffer layer, a coating layer outside the waterproof layer, a shielding layer outside the coating layer, and an outer sheath outside the shielding layer. The high adhesion of the coating not only effectively blocks the intrusion of external moisture and oxygen, extending the cable's service life in high humidity, strong ultraviolet radiation, and high temperature environments, but also enhances the cable's abrasion resistance and anti-aging properties. Simultaneously, the combination of spraying and grinding pretreatment creates a strong bonding interface between the coating and the substrate, reducing coating peeling and detachment problems caused by insufficient adhesion in traditional coating processes.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, specifically to waterproof photovoltaic cables for centralized photovoltaic power plants and their manufacturing methods. Background Technology

[0002] With the continued growth of global energy demand, photovoltaic power generation, as a clean and renewable energy source, has experienced rapid development. Centralized photovoltaic power plants, due to their large-scale and high-efficiency power generation capabilities, are widely used in open deserts, mountains, and plains. However, these areas typically face extreme natural conditions such as strong ultraviolet radiation, high temperatures, rain erosion, sandstorms, and high humidity, necessitating photovoltaic cables to meet higher performance requirements, including excellent conductivity, weather resistance, water resistance, and mechanical strength.

[0003] Existing cables typically employ aluminum foil shielding or thermoplastic polyolefin waterproofing layers outside the insulation layer. However, in long-term high-humidity or underground environments, moisture can still penetrate through tiny cracks, affecting the cable's insulation performance. Therefore, further improving the cable's protective performance has become a key focus in the industry. To effectively address the limitations of existing waterproofing structures, spray coating technology has been gradually introduced into the manufacturing process of photovoltaic cables. The spray coating forms a continuous, seamless protective layer, preventing moisture from penetrating through the tiny cracks in traditional barrier layers, thereby enhancing the cable's protective effect in high-humidity or underground environments.

[0004] However, in practical applications, the spraying process also faces some technical challenges, among which insufficient adhesion is one of the most prominent issues. The adhesion of the sprayed coating directly affects its long-term protective performance. If the coating is not firmly bonded to the substrate, it is prone to peeling, cracking, or blistering in extreme environments, resulting in a significant reduction in the protective effect. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a waterproof photovoltaic cable for centralized photovoltaic power plants and a manufacturing method thereof, which aims to alleviate the above problems to at least a certain extent.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants includes:

[0008] Step 1: Select a high-purity copper conductor as the core of the cable, anneal the conductor using an annealing device, and then feed the treated conductor into an extruder to extrude a layer of polyvinyl chloride onto the conductor surface.

[0009] Step 2: The conductor covered with the insulation layer is transported to the coating equipment, and the polyurethane foam material is evenly coated on the outside of the insulation layer by a mechanical extrusion device;

[0010] Step 3: Use a wrapping device to tightly cover the polyester film waterproof shielding material outside the sponge layer. During the wrapping process, maintain uniform tension on the device to ensure that the shielding material is tightly attached to the surface of the sponge layer. After the wrapping is completed, use a hot press to compact the waterproof layer.

[0011] Step 4: Feed the cable into the spraying device and spray a layer of fluorocarbon coating evenly.

[0012] Step 5: Wrap an aluminum foil shielding layer on the surface of the coating layer using a winding device. Then, use an extruder to extrude a high-density polyethylene outer sheath over the aluminum foil shielding layer. After the outer sheath is extruded, it is rapidly cooled by a cooling device. At the same time, online testing equipment is used to check the thickness and integrity of the outer sheath to ensure the final quality of the cable.

[0013] The spraying device includes:

[0014] A spraying frame is provided with two reels, one reel for releasing the cable and the other reel for winding the cable;

[0015] Two guide shafts are provided on the spraying frame, and the cable passes around the guide shafts;

[0016] A spraying chamber and a grinding chamber are provided on the spraying frame. A material box is provided on the top of the spraying frame. A spraying section for spraying fluorocarbon coating is provided between the material box and the spraying chamber.

[0017] Multiple grinding shafts and positioning shafts are provided in the grinding cavity;

[0018] A grinding component disposed between the grinding cavity and the grinding shaft is used to rotate the grinding shaft when the grinding cavity rotates. The grinding component can adaptively adjust the position of the grinding shaft according to the position of the positioning shaft.

[0019] Preferably, the grinding component includes a connecting frame rotatably connected to the inner wall of the grinding cavity, a fixed frame connected to the bottom of the connecting frame, a grinding shaft rotatably connected to the fixed frame, a spring a connected between the fixed frame and the connecting frame, a rotating shaft rotatably connected inside the grinding cavity, a worm gear connected to the rotating shaft, and a worm wheel meshing with the worm gear connected to the grinding shaft.

[0020] Preferably, the grinding component further includes an annular rack connected to the spraying frame, a connecting shaft is connected to the grinding cavity, a gear meshing with the annular rack is connected to the connecting shaft, and a synchronous belt drive mechanism is provided between the connecting shaft and the rotating shaft.

[0021] Preferably, the polishing component further includes a limiting frame slidably connected to both sides inside the polishing cavity, the positioning shaft is rotatably connected to the limiting frame, the rotating shaft is rotatably connected to the limiting frame, and a spring b is provided between the limiting frame and the polishing cavity.

[0022] Preferably, the synchronous belt drive mechanism includes a connection opening on the grinding cavity, a spring tension frame inside the connection opening, a synchronous pulley a on the spring tension frame, a synchronous pulley b on the connection shaft, a synchronous pulley c on the rotating shaft, and a synchronous belt drive component between the synchronous pulley a, synchronous pulley b and synchronous pulley c.

[0023] Preferably, the spraying section includes a conveying pipe connected to the bottom of the material box, a pump is provided on the conveying pipe, a connecting ring is provided on one side of the conveying pipe, a connecting piece is rotatably connected inside the connecting ring, and a plurality of spray nozzles are provided on one side of the connecting ring, the spray nozzles extending into the spraying cavity.

[0024] Preferably, the spraying frame is provided with an air duct, an exhaust fan is provided in the air duct, a connecting pipe is connected to the bottom of the air duct, an annular pipe is rotatably connected to the outer wall of the grinding cavity, and a connecting port communicating with the annular pipe is opened on the inner wall of the grinding cavity. The annular pipe is connected to the connecting pipe.

[0025] Preferably, the air duct is equipped with a filter screen and multiple heating wires, the spraying chamber is equipped with a drying chamber, and an air supply pipe connects the air duct and the drying chamber.

[0026] Preferably, a motor is provided at the bottom of the material box and at the bottom of the spraying frame. A chain drive mechanism is provided between the drive shaft of one of the motors and the spraying cavity, and a chain drive mechanism is also provided between the drive shaft of the other motor and the grinding cavity.

[0027] A waterproof photovoltaic cable includes: a conductor, an insulation layer wrapped around the conductor, a buffer layer wrapped around the insulation layer, a waterproof layer outside the buffer layer, a coating layer outside the waterproof layer, a shielding layer outside the coating layer, and an outer sheath outside the shielding layer.

[0028] In summary, the present invention has the following main beneficial effects:

[0029] By setting up spraying and grinding chambers on the spraying rack, optimal adhesion conditions are ensured on the cable surface before spraying. Within the grinding chamber, the cooperation of multiple grinding shafts and positioning shafts effectively removes oxide layers, dirt, and impurities from the cable surface. It also leaves a rough surface structure on the cable's polyester film, increasing the adhesion between the coating and the substrate. The design utilizes the positioning shafts to contact the cable's outer wall, allowing for real-time measurement of the cable diameter and adaptive adjustment of the grinding shaft positions. This ensures uniform contact between the grinding shafts and the cable's outer wall while avoiding excessive pressure, ensuring efficient grinding without damaging the cable structure. This maximizes coating adhesion and accommodates cables of different diameters. Furthermore, fluorocarbon coating stored in the hopper is sprayed onto the cable surface through the spraying unit, forming a uniform coating. After spraying, the cable enters the next process via a winding device. This technical solution allows the coating to effectively adhere to the cable surface, significantly improving the cable's protective performance. The high adhesion of the coating not only effectively blocks the intrusion of external moisture and oxygen, extending the service life of cables in high humidity, strong ultraviolet radiation, and high temperature environments, but also enhances the cable's abrasion resistance and anti-aging properties. Simultaneously, the combination of spraying and pre-treatment with grinding ensures a strong bonding interface between the coating and the substrate, reducing coating peeling and detachment problems caused by insufficient adhesion in traditional coating processes. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the material box structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the air duct structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the grinding cavity structure of the present invention;

[0034] Figure 5 This is a schematic diagram of the grinding shaft structure of the present invention;

[0035] Figure 6 This is a schematic diagram of the synchronous belt drive mechanism of the present invention;

[0036] Figure 7 This is a schematic diagram of the spraying cavity structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the connecting ring structure of the present invention;

[0038] Figure 9 This is a structural diagram of a waterproof photovoltaic cable.

[0039] Figure label:

[0040] 100. Spraying device; 101. Spraying frame; 102. Reel; 103. Guide shaft; 104. Spraying chamber; 105. Grinding chamber; 106. Material box; 107. Grinding shaft; 108. Positioning shaft;

[0041] 200. Connecting frame; 201. Fixing frame; 202. Spring a; 203. Rotating shaft; 204. Worm; 205. Worm wheel;

[0042] 300. Ring rack; 301. Connecting shaft; 302. Gear; 303. Synchronous belt drive mechanism;

[0043] 400. Limiting bracket; 401. Spring b; 402. Connecting opening; 403. Spring tension bracket; 404. Synchronous pulley a; 405. Synchronous pulley b; 406. Synchronous pulley c; 407. Synchronous belt drive component;

[0044] 500. Delivery pipe; 501. Pump; 502. Connecting ring; 503. Connecting plate; 504. Nozzle;

[0045] 600. Air duct; 601. Exhaust fan; 602. Connecting pipe; 603. Circular pipe; 604. Connection port; 605. Filter screen; 606. Heating wire; 607. Drying chamber; 608. Air supply duct;

[0046] 700. Electric motor; 701. Chain drive mechanism;

[0047] 800. Conductor; 801. Insulation layer; 802. Buffer layer; 803. Waterproof layer; 804. Coating layer; 805. Shielding layer; 806. Outer sheath. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] refer to Figures 1-9 A method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants includes:

[0050] Step 1: Select high-purity copper conductor 800 as the core of the cable. Anneal the conductor 800 using an annealing machine to improve its conductivity and flexibility. Then, feed the treated conductor 800 into an extruder and extrude a layer of polyvinyl chloride (PVC) insulation material onto the surface of the conductor 800. PVC material has excellent insulation and heat resistance properties, making it suitable for cable applications.

[0051] Step 2: The conductor 800, covered with insulation layer 801, is conveyed to the coating equipment, where polyurethane (PU) sponge material is evenly coated onto the outside of insulation layer 801 using a mechanical extrusion device. The polyurethane sponge is flexible and has good cushioning properties, which can enhance the cable's vibration resistance.

[0052] Step 3: Use a wrapping device to tightly cover the sponge layer with a polyester waterproof shielding material (such as an aluminum-coated polyester film). This polyester film has excellent waterproof performance and tensile strength. During the wrapping process, maintain uniform tension on the device to ensure that the shielding material adheres tightly to the surface of the sponge layer, avoiding looseness or uneven overlap. After wrapping, use a hot press to compact the waterproof layer 803, further enhancing its shielding and waterproof performance.

[0053] Step 4: Feed the cable into the spraying device 100, where a layer of fluorocarbon coating is evenly sprayed through a high-precision nozzle. Fluorocarbon coating has excellent corrosion resistance, weather resistance, and UV protection properties, making it suitable for outdoor photovoltaic cables.

[0054] Step 5: An aluminum foil shielding layer 805 is wrapped around the surface of the coating layer 804 using a winding device. The aluminum foil has excellent electromagnetic shielding performance and can effectively resist interference. A high-density polyethylene (HDPE) outer sheath 806 is extruded over the aluminum foil shielding layer 805 using an extruder. The HDPE outer sheath 806 has wear resistance, corrosion resistance, and aging resistance properties, and is the main protective layer of the cable. After the outer sheath 806 is extruded, it is rapidly cooled by a cooling device. At the same time, online testing equipment is used to check the thickness and integrity of the outer sheath 806 to ensure the final quality of the cable.

[0055] The spraying device 100 includes:

[0056] The spraying frame 101 is equipped with two reels 102, one reel 102 for releasing the cable and the other reel 102 for winding the cable.

[0057] Two guide shafts 103 are provided on the spray frame 101, and the cable passes around the guide shafts 103;

[0058] A spraying chamber 104 and a grinding chamber 105 are provided on the spraying frame 101. A material box 106 is provided on the top of the spraying frame 101. A spraying section for spraying fluorocarbon coating is provided between the material box 106 and the spraying chamber 104.

[0059] Multiple grinding shafts 107 and positioning shafts 108 are provided in the grinding cavity 105;

[0060] A grinding component located between the grinding cavity 105 and the grinding shaft 107 is used to rotate the grinding shaft 107 when the grinding cavity 105 rotates. The grinding component can adaptively adjust the position of the grinding shaft 107 according to the position of the positioning shaft 108.

[0061] By configuring the spraying chamber 104 and the grinding chamber 105 in the spraying frame 101, optimal adhesion conditions are ensured on the cable surface before spraying. Within the grinding chamber 105, the cooperation of multiple grinding shafts 107 and positioning shafts 108 effectively removes oxide layers, dirt, and impurities from the cable surface, leaving a rough surface structure on the cable's polyester film, increasing the adhesion between the coating and the substrate. In the design, the positioning shaft 108 contacts the cable's outer wall, allowing for real-time measurement of the cable's diameter and adaptive adjustment of the grinding shaft 107's position. This ensures uniform contact between the grinding shaft 107 and the cable's outer wall while avoiding excessive pressure, ensuring efficient grinding without damaging the cable structure, maximizing coating adhesion, and adapting to cables of different diameters. Furthermore, the fluorocarbon coating stored in the material bin 106 is sprayed onto the cable surface through the spraying unit, forming a uniform coating. After spraying, the cable enters the next process via a winding device. The above technical solutions enable the coating to effectively adhere to the cable surface, thereby significantly improving the cable's protective performance. The coating's high adhesion not only effectively blocks the intrusion of external moisture and oxygen, extending the cable's service life in high humidity, strong ultraviolet radiation, and high temperature environments, but also enhances the cable's abrasion resistance and anti-aging properties. Simultaneously, the combination of spraying and grinding pretreatment creates a strong bonding interface between the coating and the substrate, reducing coating peeling and detachment problems caused by insufficient adhesion in traditional coating processes.

[0062] As a further embodiment of the present invention, the grinding component includes a connecting frame 200 rotatably connected to the inner wall of the grinding cavity 105, a fixed frame 201 connected to the bottom of the connecting frame 200, a grinding shaft 107 rotatably connected to the fixed frame 201, a spring a202 connected between the fixed frame 201 and the connecting frame 200, a rotating shaft 203 rotatably connected inside the grinding cavity 105, a worm gear 204 connected to the rotating shaft 203, and a worm wheel 205 meshing with the worm gear 204 connected to the grinding shaft 107;

[0063] By setting up a meshing transmission structure between the worm gear 204 and the worm wheel 205, the grinding shaft 107 is driven to rotate. When the shaft 203 rotates, the worm gear 204 drives the worm wheel 205 to rotate, thereby driving the grinding shaft 107 to rotate at a certain speed. This design ensures that the grinding shaft 107 maintains a stable rotational state during operation, thus performing uniform grinding on the cable surface.

[0064] As a further embodiment of the present invention, the grinding component also includes an annular rack 300 connected to the spray frame 101, a connecting shaft 301 connected to the grinding cavity 105, a gear 302 meshing with the annular rack 300 connected to the connecting shaft 301, and a synchronous belt drive mechanism 303 provided between the connecting shaft 301 and the rotating shaft 203.

[0065] By configuring an annular rack 300 connected to the spray frame 101 and a gear 302 meshing with the annular rack 300, the gear 302 rotates along with the grinding chamber 105 when the grinding chamber 105 rotates. This rotational motion is transmitted to the synchronous belt drive mechanism 303 via the connecting shaft 301. The synchronous belt further transmits power to the rotating shaft 203, thereby driving the worm gear 204 on the rotating shaft 203 to rotate. The meshing of the worm gear 204 with the worm wheel 205 then drives the grinding shaft 107 to rotate. This transmission design cleverly utilizes the rotational motion of the grinding chamber 105 to provide power to the grinding shaft 107, enabling it to rotate synchronously with the grinding chamber 105. This achieves continuous and uniform grinding of the cable surface, improving the grinding effect.

[0066] As a further embodiment of the present invention, the grinding component also includes a limiting frame 400 slidably connected to both sides inside the grinding cavity 105, a positioning shaft 108 rotatably connected to the limiting frame 400, a rotating shaft 203 rotatably connected to the limiting frame 400, and a spring b401 provided between the limiting frame 400 and the grinding cavity 105.

[0067] By setting a limiting bracket 400 that slides on both sides inside the grinding cavity 105, and in conjunction with the action of spring b401, the limiting bracket 400 can adaptively slide within the grinding cavity 105 according to changes in cable diameter, thereby achieving precise positioning of the cable's outer wall. Both the positioning shaft 108 and the rotating shaft 203 are connected to the grinding cavity 105 via the limiting bracket 400. After the position of the limiting bracket 400 is adjusted, the rotating shaft 203 can follow, allowing the grinding shaft 107 to adapt to the cable's outer wall. In this design, spring b401 provides appropriate pressure, ensuring that the positioning shaft 108 can stably contact the cable's outer wall, while the grinding shaft 107 avoids excessive compression of the cable, ensuring the efficiency of the grinding process and the integrity of the cable.

[0068] As a further embodiment of the present invention, the synchronous belt drive mechanism 303 includes a connection opening 402 formed in the grinding cavity 105, a spring tension frame 403 disposed in the connection opening 402, a synchronous pulley a 404 disposed on the spring tension frame 403, a synchronous pulley b 405 disposed on the connecting shaft 301, and a synchronous pulley c 406 disposed on the rotating shaft 203. A synchronous belt drive component 407 is disposed between the synchronous pulleys a 404, b 405, and c 406.

[0069] By setting up a synchronous belt drive mechanism 303, including synchronous pulleys a404, b405, and c406, and a synchronous belt drive component 407, efficient power transmission between the rotating shaft 203 and the connecting shaft 301 within the grinding chamber 105 is ensured. The synchronous pulleys a404, b405, and c406, positioned on the rotating shaft 203 and connecting shaft 301, accurately transmit the rotational motion of the connecting shaft 301 to the rotating shaft 203 via the synchronous belt drive component 407. The synchronous belt drive component 407 reduces errors during motion transmission, maintaining stability and precision, ensuring stable contact between the grinding shaft 107 and the cable outer wall for uniform grinding. Simultaneously, the spring tension frame 403 provides appropriate tension to the synchronous belt. When the rotating shaft 203 shifts, the spring tension frame 403 adaptively adjusts the position of the synchronous pulley a404 to maintain transmission and ensure the stability of the synchronous belt drive system.

[0070] As a further embodiment of the present invention, the spraying unit includes a conveying pipe 500 connected to the bottom of the material box 106, a pump 501 is provided on the conveying pipe 500, a connecting ring 502 is provided on one side of the conveying pipe 500, a connecting piece 503 is rotatably connected inside the connecting ring 502, and a plurality of spray nozzles 504 are provided on one side of the connecting ring 502, the spray nozzles 504 extending into the spraying cavity 104.

[0071] By incorporating pump 501, the delivery pipe 500, driven by pump 501, delivers paint from the bottom of the hopper 106 to the nozzle 504, ensuring stable paint flow and maintaining constant pressure. The design of the connecting ring 502 and connecting piece 503 allows multiple nozzles 504 to be flexibly distributed within the spraying chamber 104 and to rotate with the spraying chamber 104, thereby achieving uniform spraying of the cable surface.

[0072] As a further embodiment of the present invention, the spraying rack 101 is provided with an air duct 600, an exhaust fan 601 is provided inside the air duct 600, a connecting pipe 602 is connected to the bottom of the air duct 600, an annular pipe 603 is rotatably connected to the outer wall of the grinding cavity 105, and a connecting port 604 communicating with the annular pipe 603 is opened on the inner wall of the grinding cavity 105, and the annular pipe 603 is connected to the connecting pipe 602.

[0073] By setting up the air duct 600 and exhaust fan 601 on the spraying rack 101, the dust extraction function can be effectively achieved. When the exhaust fan 601 in the air duct 600 is running, it generates negative pressure, which draws air from the inside of the grinding chamber 105 and the spraying chamber 104, sucking dust, oxides and other impurities in the air into the air duct 600 for discharge. This prevents grinding dust from accumulating in the working area, improves the cleanliness of the working environment, and thus prevents subsequent cables from being contaminated by dust when receiving the coating, thereby affecting the quality of the coating.

[0074] As a further embodiment of the present invention, a filter screen 605 is provided in the air duct 600, and a plurality of heating wires 606 are also provided in the air duct 600. A drying chamber 607 is provided in the spraying chamber 104, and an air supply pipe 608 is connected between the air duct 600 and the drying chamber 607.

[0075] By incorporating filter 605, large particulate impurities such as dust and other pollutants in the air can be effectively filtered. The heating wire 606 heats the air, increasing its temperature and enhancing its drying capacity. Through the air supply pipe 608 between the air duct 600 and the drying chamber 607, warm, dry air is effectively blown onto the coating surface, accelerating moisture evaporation and ensuring coating quality and curing effect. Overall, this system design not only improves the coating quality of cables but also enhances production automation and energy efficiency, further optimizing the production process.

[0076] As a further embodiment of the present invention, a motor 700 is provided at the bottom of the material box 106 and the bottom of the spraying rack 101. A chain transmission mechanism 701 is provided between the drive shaft of one motor 700 and the spraying cavity 104, and a chain transmission mechanism 701 is also provided between the drive shaft of the other motor 700 and the grinding cavity 105.

[0077] By incorporating a motor 700 and connecting the spraying chamber 104 and the grinding chamber 105 via a chain drive mechanism 701, precise control and drive of these two chambers can be achieved. The motor 700 provides power through a drive shaft, and the chain drive mechanism 701 effectively transmits power to the spraying chamber 104 and the grinding chamber 105, enabling their synchronous or independent operation. The chain drive ensures the stability and continuity of the spraying and grinding processes.

[0078] A waterproof photovoltaic cable includes: a conductor 800, an insulation layer 801 wrapped around the conductor 800, a buffer layer 802 wrapped around the insulation layer 801, a waterproof layer 803 outside the buffer layer 802, a coating layer 804 outside the waterproof layer 803, a shielding layer 805 outside the coating layer 804, and an outer sheath 806 outside the shielding layer 805.

[0079] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants, characterized in that, include: Step 1: Select a high-purity copper conductor as the core of the cable, anneal the conductor using an annealing device, and then feed the treated conductor into an extruder to extrude a layer of polyvinyl chloride onto the conductor surface. Step 2: The conductor covered with the insulation layer is transported to the coating equipment, and the polyurethane foam material is evenly coated on the outside of the insulation layer by a mechanical extrusion device; Step 3: Use a wrapping device to tightly cover the polyester film waterproof shielding material outside the sponge layer. During the wrapping process, maintain uniform tension on the device to ensure that the shielding material is tightly attached to the surface of the sponge layer. After the wrapping is completed, use a hot press to compact the waterproof layer. Step 4: Feed the cable into the spraying device (100) and spray a layer of fluorocarbon coating evenly; Step 5: Wrap an aluminum foil shielding layer on the surface of the coating layer using a winding device. Then, use an extruder to extrude a high-density polyethylene outer sheath over the aluminum foil shielding layer. After the outer sheath is extruded, it is rapidly cooled by a cooling device. At the same time, online testing equipment is used to check the thickness and integrity of the outer sheath to ensure the final quality of the cable. The spraying device (100) includes: A spraying frame (101) is provided with two reels (102), one of which is used to release the cable and the other of which is used to rewind the cable; Two guide shafts (103) are provided on the spraying frame (101), and the cable passes around the guide shafts (103). A spraying chamber (104) and a grinding chamber (105) are provided on the spraying frame (101). A material box (106) is provided on the top of the spraying frame (101). A spraying section for spraying fluorocarbon coating is provided between the material box (106) and the spraying chamber (104). Multiple grinding shafts (107) and positioning shafts (108) are provided in the grinding cavity (105). A grinding component disposed between the grinding cavity (105) and the grinding shaft (107) is used to rotate the grinding shaft (107) when the grinding cavity (105) rotates. The grinding component can adaptively adjust the position of the grinding shaft (107) according to the position of the positioning shaft (108). The grinding component includes a connecting frame (200) rotatably connected to the inner wall of the grinding cavity (105), a fixed frame (201) connected to the bottom of the connecting frame (200), a grinding shaft (107) rotatably connected to the fixed frame (201), a spring a (202) connected between the fixed frame (201) and the connecting frame (200), a rotating shaft (203) rotatably connected inside the grinding cavity (105), a worm gear (204) connected to the rotating shaft (203), and a worm wheel (205) meshing with the worm gear (204) connected to the grinding shaft (107). The grinding component also includes an annular rack (300) connected to the spray frame (101), a connecting shaft (301) connected to the grinding cavity (105), a gear (302) connected to the connecting shaft (301) and meshing with the annular rack (300), and a synchronous belt drive mechanism (303) is provided between the connecting shaft (301) and the rotating shaft (203). The grinding component also includes a limiting frame (400) slidably connected to both sides inside the grinding cavity (105), a positioning shaft (108) rotatably connected to the limiting frame (400), a rotating shaft (203) rotatably connected to the limiting frame (400), and a spring b (401) is provided between the limiting frame (400) and the grinding cavity (105). The synchronous belt drive mechanism (303) includes a connection opening (402) on the grinding cavity (105), a spring tension frame (403) is provided in the connection opening (402), a synchronous pulley a (404) is provided on the spring tension frame (403), a synchronous pulley b (405) is provided on the connecting shaft (301), a synchronous pulley c (406) is provided on the rotating shaft (203), and a synchronous belt drive component (407) is provided between the synchronous pulley a (404), the synchronous pulley b (405) and the synchronous pulley c (406).

2. The manufacturing method of the waterproof photovoltaic cable for centralized photovoltaic power stations according to claim 1, characterized in that, The spraying unit includes a conveying pipe (500) connected to the bottom of the material box (106). A pump (501) is provided on the conveying pipe (500). A connecting ring (502) is provided on one side of the conveying pipe (500). A connecting piece (503) is rotatably connected inside the connecting ring (502). A plurality of nozzles (504) are provided on one side of the connecting ring (502). The nozzles (504) extend into the spraying cavity (104).

3. The method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants according to claim 1, characterized in that, The spraying frame (101) is provided with an air duct (600), and an exhaust fan (601) is provided inside the air duct (600). A connecting pipe (602) is connected to the bottom of the air duct (600). An annular pipe (603) is rotatably connected to the outer wall of the grinding cavity (105). A connecting port (604) communicating with the annular pipe (603) is opened on the inner wall of the grinding cavity (105). The annular pipe (603) is connected to the connecting pipe (602).

4. The method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants according to claim 3, characterized in that, The air duct (600) is equipped with a filter screen (605), and the air duct (600) is also equipped with multiple heating wires (606). The spraying cavity (104) is equipped with a drying cavity (607), and the air duct (600) and the drying cavity (607) are connected by an air supply pipe (608).

5. The method for manufacturing waterproof photovoltaic cables for centralized photovoltaic power plants according to claim 1, characterized in that, Both the bottom of the material box (106) and the bottom of the spray frame (101) are equipped with motors (700). One of the motors (700) has a chain drive mechanism (701) between its drive shaft and the spray cavity (104), and the other motor (700) also has a chain drive mechanism (701) between its drive shaft and the grinding cavity (105).

6. A waterproof photovoltaic cable for centralized photovoltaic power stations, characterized in that, The waterproof photovoltaic cable for centralized photovoltaic power stations is manufactured using the manufacturing method described in any one of claims 1 to 5, and includes: a conductor (800), an insulation layer (801) wrapped around the conductor (800), a buffer layer (802) covering the insulation layer (801), a waterproof layer (803) on the outside of the buffer layer (802), a coating layer (804) on the outside of the waterproof layer (803), a shielding layer (805) on the outside of the coating layer (804), and an outer sheath (806) on the outside of the shielding layer (805).

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