Medium-voltage cross-linked polyethylene insulated anti-termite low-smoke halogen-free sheath nylon protective layer power cable and production equipment

Abstract

The utility model relates to the technical field of power cables, and discloses a medium-voltage cross-linked polyethylene insulated anti-termite low-smoke halogen-free sheath nylon protection layer power cable, which comprises a conductor, a conductor shield is fixedly arranged on the outer side of the conductor, an insulator is fixedly arranged on the outer side of the conductor shield, an insulation shield is fixedly arranged on the outer side of the insulator, and a nylon protection layer is fixedly arranged on the outer side of the insulation shield. The semi-conductive nylon tape is fixedly arranged on the outer side of the insulation shield, the metal shield is fixedly arranged on the outer side of the semi-conductive nylon tape, the halogen-free low-smoke wrapping tape is fixedly arranged on the outer side of the metal shield, the inner sheath is fixedly arranged on the outer side of the halogen-free low-smoke wrapping tape, and the aluminum wire armor is fixedly arranged on the outer side of the inner sheath. According to the medium-voltage cross-linked polyethylene insulated anti-termite low-smoke halogen-free sheath nylon protection layer power cable and the production equipment, through the unique cable structure design, such as the arrangement of the outer nylon sheath and the semi-conductive nylon tape, the biting of animals such as termites and the like is effectively prevented, and the durability of the cable in a complex environment is improved.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cables and their production equipment. Background Technology

[0002] In the field of power transmission, medium-voltage power cables play a crucial role in power transmission. However, traditional power cables have many shortcomings when facing complex environments. For example, in areas where termites are active, the sheath of ordinary cables is easily damaged by termites, leading to a decline in cable insulation performance and causing power failures. At the same time, traditional cables release large amounts of dense smoke and toxic gases when burned, posing a serious threat to the environment and personnel safety. Furthermore, with the continuous growth of electricity demand, higher requirements are being placed on the mechanical performance, electrical performance, and production efficiency of cables. Existing cable structures and production equipment are unable to meet these increasingly stringent requirements simultaneously. Therefore, it is necessary to develop a new type of power cable and its production equipment to improve the overall performance and production quality of cables. Utility Model Content

[0003] Technical problem to be solved: The purpose of this utility model is to provide a medium-voltage cross-linked polyethylene insulated termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable and its production equipment, so as to solve the problems mentioned in the background art, that traditional cables are easily damaged by termites and that production equipment is difficult to meet the requirements of high-performance and high-quality production.

[0004] Technical Solution: To achieve the above objectives, this utility model provides the following technical solution: a medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cable, comprising a conductor, a conductor shield fixedly disposed on the outside of the conductor, an insulation layer fixedly disposed on the outside of the conductor shield, an insulation shield fixedly disposed on the outside of the insulation, a semi-conductive nylon tape fixedly disposed on the outside of the insulation shield, a metal shield fixedly disposed on the outside of the semi-conductive nylon tape, a halogen-free, low-smoke wrapping tape fixedly disposed on the outside of the metal shield, an inner sheath fixedly disposed on the outside of the halogen-free, low-smoke wrapping tape, an aluminum wire armor fixedly disposed on the outside of the inner sheath, a halogen-free, low-smoke wrapping tape also disposed on the outside of the aluminum wire armor, and an outer nylon sheath fixedly disposed on the outside of the halogen-free, low-smoke wrapping tape.

[0005] Preferably, the conductor has a trapezoidal conductor structure. The 400mm conductor structure is composed of 53 (1+6+12+15+19) single wires spliced ​​and twisted together. A 0.20mm thick water-blocking tape is wrapped between each layer of conductor. The final outer diameter of the conductor is 23.2mm, and the breaking elongation of any single wire is not less than 25%.

[0006] Preferably, the semiconducting water-resistant tape has a thickness of 0.3 mm, a width of 25 mm, and an overlap rate of 15%, which enhances the water-blocking performance of the cable. It is made of semiconducting polyolefin mixture extrusion, the inner shielding layer has an average thickness of 0.7 mm, the insulation layer is extruded from cross-linked polyethylene material, the insulation eccentricity of the insulation layer is less than 4%, the nominal thickness of the insulation layer is 11.0 mm, and the thinnest point thickness is 9.80 mm.

[0007] Preferably, the outer shielding layer is extruded from a semi-conductive polyolefin mixture, with an average thickness of 0.7 mm. It is wound with 44 φ1.00 copper wires at a small pitch (less than 650 mm) and armored with 67 2.50 aluminum wires, providing mechanical properties without hysteresis loss. The non-metallic sheath is made of halogen-free, low-smoke material with a thickness of 3.1 mm, an outer diameter of 68.0 mm, and a light transmittance of 88%. The nylon sheath is 0.50 mm thick to prevent animal bites.

[0008] Production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cables includes a processing platform. Support rods are fixedly installed below the processing platform, and connecting rods are fixedly installed between adjacent support rods. Above the processing platform, a conductor stranding device, a semi-conductive resistive water-filled tape wrapping device, a shielding layer extrusion device, an insulation layer extrusion device, a metal wire winding and armoring device, and a sheath extrusion device are sequentially arranged.

[0009] Preferably, the conductor stranding device includes multiple wire feeding frames, each of which is used to hold monofilaments of different specifications. The shielding layer extrusion device is equipped with a tape feeding mechanism, a tension control mechanism, and a wrapping mechanism. The inner and outer shielding layers of the insulation layer extrusion device are both extruded using high-precision extruders. The extruder of the inner shielding layer extrusion device is equipped with a precision screw and die.

[0010] Preferably, the wire winding and armoring device is equipped with an automatic wire feeding, tension control and armor forming mechanism, and the sheath extrusion device is equipped with a metering device and a mold temperature control system.

[0011] Each wire feeding frame holds monofilaments of different specifications. Using a high-precision traction mechanism and stranding die, 53 monofilaments (1+6+12+15+19) are spliced ​​and stranded according to a specific number of layers and arrangement. During the stranding process, a tension adjustment system is installed to monitor and adjust the tension of the monofilaments in real time, ensuring that the breaking elongation of any single wire is not less than 25%, while also guaranteeing the stability of the conductor structure. Furthermore, after each layer of conductor is stranded, a 0.20mm thick water-blocking tape is automatically wrapped around it. The wrapping device uses a high-precision transmission and positioning system to ensure uniform and tight wrapping of the water-blocking tape. This device is equipped with a tape feeding mechanism, a tension control mechanism, and a wrapping mechanism. The tape feeding mechanism can smoothly feed out a 0.20mm thick water-blocking tape. The cable uses a 0.3mm thick, 25mm wide semi-conductive water-blocking tape. A tension control mechanism precisely adjusts the tape tension, maintaining a stable overlap of 15%, effectively enhancing the cable's water-blocking performance. The wrapping mechanism employs an advanced CNC system, precisely adjusting the wrapping speed and angle according to cable specifications and production requirements. The inner shielding extrusion device features a precision screw and die, ensuring uniform extrusion of the semi-conductive polyolefin mixture and maintaining an average inner shielding layer thickness of 0.7mm. The outer shielding extrusion device also boasts high-precision control components. During extrusion, an online thickness detection system monitors the outer shielding layer thickness in real time and feeds it back to the extruder's control system, achieving precise control of the outer shielding layer thickness. With precise control of an average thickness of 0.7mm, the insulation layer is extruded using cross-linked polyethylene material. An extruder with advanced temperature and pressure control is employed. The extruder's internal temperature control system precisely regulates the extrusion temperature of the cross-linked polyethylene material, ensuring stable material performance. The pressure control system ensures uniform extrusion pressure, resulting in an insulation eccentricity of less than 4%. The nominal insulation layer thickness is 11.0mm, and through high-precision molds and online thickness monitoring devices, the thinnest point thickness reaches 9.80mm. For the winding of 44 φ1.00 copper wires, a dedicated copper wire winding device is designed. This device uses a programmable controller to precisely control the winding pitch, ensuring small pitch (less than 650mm) winding and improving cable stability. Regarding electrical performance, the aluminum wire armor uses 67 2.50mm aluminum wires for armoring. The armoring device is equipped with automatic wire feeding, tension control, and armor forming mechanisms, ensuring tight and uniform aluminum wire armoring. This provides good mechanical properties while avoiding hysteresis loss. The non-metallic sheath uses halogen-free, low-smoke sheath material extruded using a specialized sheath extruder equipped with a metering device and a die temperature control system. This allows for precise control of the extrusion amount of halogen-free, low-smoke sheath material, ensuring a non-metallic sheath thickness of 3.1mm and an outer diameter of 68.0mm, while maintaining a light transmittance of 88%. The nylon sheath extrusion device uses a precision extruder and a special die to ensure a nylon sheath thickness of 0.50mm, effectively preventing animal chewing.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This medium-voltage cross-linked polyethylene insulated termite-proof low-smoke halogen-free sheathed nylon protective layer power cable and its production equipment, through unique cable structure design, such as the setting of outer nylon sheath and semi-conductive nylon tape, effectively prevents termites and other animals from gnawing, and improves the durability of the cable in complex environments.

[0014] 2. This medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable and its production equipment, by using halogen-free, low-smoke sheath material, significantly reduces the emission of dense smoke and toxic gases generated during cable combustion, improves fire safety performance, and protects the environment and personnel safety.

[0015] 3. This medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cable and its production equipment, through optimized conductor structure, insulation layer and shielding layer design, and the use of aluminum wire armor, reduce hysteresis loss and improve the electrical transmission performance and stability of the cable while ensuring good mechanical properties.

[0016] 4. This medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable and its production equipment, by being equipped with advanced production equipment, such as high-precision extruders and various production devices with multiple control mechanisms, improves the automation and precision of the production process, thereby enhancing the production quality and efficiency of the cable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cables according to this utility model.

[0019] In the diagram: 1. Conductor; 2. Conductor shield; 3. Insulation; 4. Insulation shield; 5. Semi-conductive nylon tape; 6. Metal shield; 7. Halogen-free low-smoke wrapping tape; 8. Inner sheath; 9. Aluminum wire armor; 10. Outer nylon sheath; 11. Processing platform; 12. Support rod; 13. Connecting rod; 14. Conductor stranding device; 15. Semi-conductive resistive water-filled wrapping tape device; 16. Shielding layer extrusion device; 17. Insulation layer extrusion device; 18. Metal wire winding and armoring device; 19. Sheath extrusion device. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 - Figure 2 This utility model provides a technical solution: a medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cable, including a conductor 1, a conductor shield 2 fixedly disposed on the outside of the conductor 1, an insulation 3 fixedly disposed on the outside of the conductor shield 2, an insulation shield 4 fixedly disposed on the outside of the insulation 3, a semi-conductive nylon tape 5 fixedly disposed on the outside of the insulation shield 4, a metal shield 6 fixedly disposed on the outside of the semi-conductive nylon tape 5, a halogen-free, low-smoke wrapping tape 7 fixedly disposed on the outside of the metal shield 6, an inner sheath 8 fixedly disposed on the outside of the halogen-free, low-smoke wrapping tape 7, an aluminum wire armor 9 fixedly disposed on the outside of the inner sheath 8, a halogen-free, low-smoke wrapping tape 7 also disposed on the outside of the aluminum wire armor 9, and an outer nylon sheath 10 fixedly disposed on the outside of the halogen-free, low-smoke wrapping tape 7.

[0022] The conductor 1 has a trapezoidal conductor structure. The 400mm conductor structure is composed of 53 strands (1+6+12+15+19) spliced ​​and twisted together. A 0.20mm thick water-blocking tape is wrapped between each conductor layer. The final outer diameter of the conductor is 23.2mm, and the elongation at break of any single strand is not less than 25%. The semi-conductive water-blocking tape is 0.3mm thick and 25mm wide, with an overlap of 15%, enhancing the cable's water-blocking performance. It is extruded from a semi-conductive polyolefin mixture. The average thickness of the inner shielding layer is 0.7mm, and the insulation layer is made of cross-linked polyethylene material. The insulation layer has an insulation eccentricity of less than 4%, a nominal thickness of 11.0 mm, and a minimum thickness of 9.80 mm. The outer shielding layer is extruded from a semi-conductive polyolefin mixture, with an average thickness of 0.7 mm. It is wound with 44 φ1.00 copper wires with a small pitch of less than 650 mm and armored with 67 2.50 aluminum wires. It has mechanical properties and no hysteresis loss. The non-metallic sheath is made of halogen-free low-smoke sheath material with a thickness of 3.1 mm, an outer diameter of 68.0 mm, and a light transmittance of 88%. The nylon sheath is 0.50 mm thick and prevents animal bites.

[0023] Production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cables includes a processing platform 11. A support rod 12 is fixedly installed below the processing platform 11, and a connecting rod 13 is fixedly installed between adjacent support rods 12. A conductor stranding device 14, a semi-conductive resistive water-filled tape wrapping device 15, a shielding layer extrusion device 16, an insulation layer extrusion device 17, a metal wire winding and armoring device 18, and a sheath extrusion device 19 are sequentially installed above the processing platform 11.

[0024] Each wire feeding frame holds monofilaments of different specifications. Using a high-precision traction mechanism and stranding die, 53 monofilaments (1+6+12+15+19) are spliced ​​and stranded according to a specific number of layers and arrangement. During the stranding process, a tension adjustment system is installed to monitor and adjust the tension of the monofilaments in real time, ensuring that the breaking elongation of any single wire is not less than 25%, while also guaranteeing the stability of the conductor structure. Furthermore, after each layer of conductor is stranded, a 0.20mm thick water-blocking tape is automatically wrapped around it. The wrapping device uses a high-precision transmission and positioning system to ensure uniform and tight wrapping of the water-blocking tape. This device is equipped with a tape feeding mechanism, a tension control mechanism, and a wrapping mechanism. The tape feeding mechanism can smoothly feed out a 0.20mm thick water-blocking tape. The cable uses a 0.3mm thick, 25mm wide semi-conductive water-blocking tape. A tension control mechanism precisely adjusts the tape tension, maintaining a stable overlap of 15%, effectively enhancing the cable's water-blocking performance. The wrapping mechanism employs an advanced CNC system, precisely adjusting the wrapping speed and angle according to cable specifications and production requirements. The inner shielding extrusion device features a precision screw and die, uniformly extruding the semi-conductive polyolefin mixture to ensure an average inner shielding layer thickness of 0.7mm. The outer shielding extrusion device also boasts high-precision control components. During extrusion, an online thickness detection system monitors the outer shielding layer thickness in real time and feeds it back to the extruder's control system, achieving optimal outer shielding performance. With precise control of an average layer thickness of 0.7mm, the insulation layer is extruded using cross-linked polyethylene material. An extruder with advanced temperature and pressure control is employed. The extruder's internal temperature control system precisely regulates the extrusion temperature of the cross-linked polyethylene material, ensuring stable material performance. The pressure control system ensures uniform extrusion pressure, resulting in an insulation eccentricity of less than 4%. The nominal insulation layer thickness is 11.0mm, and through high-precision molds and online thickness monitoring devices, the thinnest point thickness is guaranteed to reach 9.80mm. For the winding of 44 φ1.00 copper wires, a dedicated copper wire winding device is designed. This device uses a programmable controller to precisely control the winding pitch, ensuring small pitch (less than 650mm) winding and improving cable performance. Regarding electrical performance, the aluminum wire armor uses 67 2.50mm aluminum wires for armoring. The armoring device is equipped with automatic wire feeding, tension control, and armor forming mechanisms, ensuring tight and uniform aluminum wire armoring. This provides good mechanical properties while avoiding hysteresis loss. The non-metallic sheath uses halogen-free, low-smoke sheath material extruded using a specialized sheath extruder equipped with a metering device and a die temperature control system. This precisely controls the extrusion amount of the halogen-free, low-smoke sheath material, ensuring a non-metallic sheath thickness of 3.1mm and an outer diameter of 68.0mm, while achieving a light transmittance of 88%. The nylon sheath extrusion device uses a precision extruder and a special die to ensure a nylon sheath thickness of 0.50mm, effectively preventing animal chewing.

[0025] Working Principle: At the start of production, the wire feeding frame of the conductor stranding device 14 precisely feeds out monofilaments of different specifications. Driven by the traction mechanism, 53 monofilaments are spliced ​​and stranded in the stranding mold according to the trapezoidal conductor structure. During this process, the tension adjustment system ensures that the breaking elongation of the monofilament is not less than 25%. After each layer of stranding is completed, the high-precision system automatically wraps 0.20mm water-blocking tape. Then, the semi-conductive water-blocking tape wrapping device 15 operates, the tape feeding mechanism outputs semi-conductive water-blocking tape, the tension control mechanism maintains a 15% overlap rate, and the wrapping mechanism flexibly adjusts the wrapping parameters according to the cable specifications to shield the cable. The layer extrusion device 16 precisely extrudes the inner and outer shielding layers using a precision screw, die, and online thickness detection system, with an average thickness of 0.7mm. The insulation layer extrusion device 17 relies on advanced temperature and pressure control, combined with a high-precision die, to ensure that all parameters of the insulation layer meet the standards. Then, the metal wire winding and armoring device 18 precisely controls the copper wire winding pitch according to instructions to complete the tight armoring of the aluminum wire. Finally, the sheath extrusion device 19 uses a metering and temperature control system to precisely extrude the halogen-free low-smoke sheath and nylon sheath. All devices work together to achieve precise and high-quality cable production.

[0026] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cable, comprising a conductor (1), characterized in that: A conductor shield (2) is fixedly provided on the outside of the conductor (1). An insulation (3) is fixedly provided on the outside of the conductor shield (2). An insulation shield (4) is fixedly provided on the outside of the insulation (3). A semi-conductive nylon tape (5) is fixedly provided on the outside of the insulation shield (4). A metal shield (6) is fixedly provided on the outside of the semi-conductive nylon tape (5). A halogen-free low-smoke wrapping tape (7) is fixedly provided on the outside of the metal shield (6). An inner sheath (8) is fixedly provided on the outside of the halogen-free low-smoke wrapping tape (7). An aluminum wire armor (9) is fixedly provided on the outside of the inner sheath (8). A halogen-free low-smoke wrapping tape (7) is also provided on the outside of the aluminum wire armor (9). An outer nylon sheath (10) is fixedly provided on the outside of the halogen-free low-smoke wrapping tape (7).

2. The medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable according to claim 1, characterized in that: The conductor (1) has a trapezoidal conductor structure. The 400mm conductor structure is made up of 53 (1+6+12+15+19) single wires spliced ​​and twisted together. A 0.20mm thick water-blocking tape is wrapped between each layer of conductor. The final outer diameter of the conductor is 23.2mm. The breaking elongation of any single wire is not less than 25%.

3. The medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable according to claim 2, characterized in that: The semi-conductive nylon tape (5) has a thickness of 0.3 mm, a width of 25 mm, and a wrapping overlap rate of 15%. It is made of semi-conductive polyolefin mixture extrusion. The average thickness of the inner shielding layer is 0.7 mm. The insulation layer is extruded from cross-linked polyethylene material. The insulation eccentricity of the insulation layer is less than 4%. The nominal thickness of the insulation layer is 11.0 mm, and the thinnest point thickness is 9.80 mm.

4. The medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cable according to claim 3, characterized in that: The insulating shield (4) is made of a semi-conductive polyolefin mixture extruded. The insulating shield (4) has an average thickness of 0.7 mm. It is made of 44 φ1.00 copper wires wound with a small pitch (less than 650 mm). It is armored with 67 2.50 aluminum wires. The non-metallic sheath is made of halogen-free low-smoke sheath material with a thickness of 3.1 mm, an outer diameter of 68.0 mm, and a light transmittance of 88%. The nylon sheath has a thickness of 0.50 mm.

5. Production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed, nylon protective layer power cables, including a processing platform (11), characterized in that: A support rod (12) is fixedly installed below the processing platform (11), and a connecting rod (13) is fixedly installed between adjacent support rods (12). A conductor stranding device (14), a semiconducting resistive water wrapping device (15), a shielding layer extrusion device (16), an insulation layer extrusion device (17), a metal wire winding and armoring device (18), and a sheath extrusion device (19) are sequentially installed above the processing platform (11).

6. The production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cables according to claim 5, characterized in that: The conductor stranding device (14) includes multiple wire feeding frames, each of which is used to hold different specifications of monofilaments. The shielding layer extrusion device (16) is equipped with a tape feeding mechanism, a tension control mechanism, and a wrapping mechanism. The inner shielding layer and outer shielding layer extrusion of the insulation layer extrusion device (17) are both performed using high-precision extruders. The extruder of the inner shielding layer extrusion device is equipped with a precision screw and die.

7. The production equipment for medium-voltage cross-linked polyethylene insulated, termite-proof, low-smoke, halogen-free sheathed nylon protective layer power cables according to claim 6, characterized in that: The wire winding and armoring device (18) is equipped with an automatic wire feeding, tension control and armor forming mechanism, and the sheath extrusion device (19) is equipped with a metering device and a mold temperature control system.

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