Flame-retardant low-smoke halogen-free environment-friendly low-voltage cable and preparation method thereof

Abstract

This invention discloses a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable, relating to the field of low-voltage cable technology. It includes an inner conductor, which is sequentially covered by an inner insulation layer, an inner shielding layer, and an inner protective rubber layer. Multiple strands of the inner protective rubber layer are collectively covered by a rubber bundling layer. The rubber bundling layer is then covered by a silicone insulating layer and an outer rubber protective layer. This invention effectively prevents localized heat accumulation during cable use. Furthermore, by utilizing a deformable, spliced ​​structure between the inner insulating layer and the middle protective layer, hot air can be directly and quickly discharged from the side of the cable during heat dissipation, effectively preventing heat accumulation and overheating during use. This ensures the cable remains within a suitable temperature range during continuous use, thereby effectively improving its service life.

Description

Technical Field

[0001] This invention relates to the field of low-voltage cable technology, specifically to a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable and its preparation method. Background Technology

[0002] Cables are typically made up of several or several groups of conductors, each group consisting of at least two strands twisted together like a rope. Each group of conductors is insulated from each other and is often twisted around a central core. Low-voltage cables are a common type of cable, mainly used to connect low-voltage power sources and equipment, enabling the equipment to obtain power through the cable to perform work. They are also used as control cables, communication cables, signal cables, etc. Flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cables are environmentally friendly and safe power transmission cables with a rated voltage of 0.6 / 1kV and below and possessing three core characteristics. They are widely used in places with extremely high safety and environmental protection requirements. For this purpose, a Chinese patent discloses a low-smoke, halogen-free, flame-retardant, and fire-resistant environmentally friendly low-voltage cable, application number CN202310052870.2. This patent uses the cooperation of slots and elastic limiting plates to facilitate the splicing of partitions inside the inner cylinder. The partitions divide the inner cylinder into three equal spaces for separately filling conductors, thereby separating each conductor. However, due to the limitations of its own structure, when multiple low-voltage cables are used in a dense arrangement, the heat generated by the multiple different cables cannot be dissipated in time. This leads to the continuous accumulation of heat inside the cables located within the cable bundle, causing the cable sheath to melt and break. At the same time, the long-term operation of low-voltage cables in high-temperature environments will also accelerate the aging rate of the cable sheath, thereby reducing the service life of the low-voltage cables. Summary of the Invention

[0003] This invention provides a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable and its preparation method. It can effectively solve the problems mentioned in the background art, such as the limitation of the low-voltage cable's own structure during use, which leads to the inability to dissipate the heat generated by multiple cables when they are densely arranged, resulting in the continuous accumulation of heat inside the cable bundle and the melting and damage of the cable sheath. At the same time, the long-term operation of low-voltage cables in high-temperature environments will also accelerate the aging rate of the cable sheath, thereby reducing the service life of the low-voltage cable.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable, comprising an inner conductor, wherein the outer side of the inner conductor is sequentially covered with an inner insulation layer, an inner shielding layer, and an inner protective rubber layer, and multiple strands of the inner protective rubber layers are collectively covered with a rubber bundling layer. The outer layer of the rubber bundle layer is provided with an outer multi-gap protective isolation mechanism. The outer multi-gap protective isolation mechanism is used to isolate and protect the outside of the cable, and to continuously and efficiently cool the outside of the cable through a continuous flow of air to improve the overall heat dissipation effect of the cable. The outer multi-gap protective isolation mechanism includes a silicone isolation layer; The rubber binding layer is covered with a silicone isolation layer and an outer rubber protective layer. Rectangular splicing grooves are evenly spaced along the circumferential direction on the outer side of the outer rubber protective layer. The rectangular splicing groove is internally bonded with a connecting strip, the connecting strip is internally filled with a reinforcing adhesive strip, and an arc-shaped connecting adhesive strip is fixedly connected to one side of the connecting strip. The arc-shaped connecting adhesive strip has equidistant and uniformly spaced bending notches along the axial direction on one side. A supporting isolation strip is evenly embedded in the middle of one side of the arc-shaped connecting strip, and auxiliary connecting cables are interspersed among the multiple supporting isolation strips.

[0005] Preferably, the silicone isolation layer has uniformly formed elastic expansion grooves on its outer surface, and the outer side of the silicone isolation layer is tightly bonded to the inner wall of the outer rubber protective layer.

[0006] Preferably, the gap between the rectangular splicing groove and the silicone isolation layer is filled with connecting adhesive, and the inner arc surface of the arc-shaped connecting adhesive strip is tightly bonded to the outer side of the outer rubber protective layer.

[0007] Preferably, the outer side of the supporting isolation strip is tightly covered with an inner isolation layer, the outer side of the inner isolation layer is tightly covered with a middle protective layer, and the outer side of the middle protective layer is tightly covered with an outer protective mesh. The inner layer is uniformly provided with an inner rectangular guide groove on its outer side, and an inner rectangular insert is uniformly bonded to the outer side of the inner layer. The middle protective layer is uniformly provided with a middle rectangular guide groove on its inner side, and a middle rectangular insert is uniformly bonded to the inner side of the middle protective layer. The inner rectangular guide groove and the middle rectangular insert are positioned and interlocked with each other, and the outer protective mesh is woven from waterproof chemical fiber.

[0008] Preferably, both ends of the outer rubber protective layer are symmetrically snapped with arc-shaped mounting covers, and the ends of the two arc-shaped mounting covers are threaded with splicing bolts. The inner arc surface of the arc-shaped mounting cover is provided with air guide grooves at equal intervals. The two curved mounting covers fit tightly together, and the sides of the air guide groove correspond to each other with the supporting isolation strip.

[0009] Preferably, a cooling circulating fan is embedded in the middle of the side of the arc-shaped mounting cover. The cooling circulating fan is powered by an external power source. A rectangular mounting cover is snapped onto the side of the arc-shaped mounting cover at the position corresponding to the outer side of the cooling circulating fan. A dustproof end net is embedded in one end of the inner side of the rectangular mounting cover. A gap is left between the outer side of the cooling circulating fan and the inner cavity of the rectangular mounting cover, and the side of the dustproof end mesh is flush with the end face of the rectangular mounting cover.

[0010] Preferably, the rubber binding layer is provided with an internal dynamic protection mechanism, which is used to provide flexible support for the inside of the cable and to provide buffer protection for the cable by utilizing the movable characteristics of the support components, so as to improve the stress condition of the cable. The internal dynamic protection mechanism includes a central connecting rubber strip; A central connecting strip is provided in the middle of the inner side of the rubber binding layer. Connecting soft rubber strips are uniformly and equidistantly sleeved on the outer side of the central connecting strip along the axial direction. A connecting triangular rubber strip is fixedly connected to the end of the connecting soft rubber strip at the position corresponding to the outer side of the central connecting strip. The three sides of the connecting triangular adhesive strip are each embedded with an internal splicing adhesive strip. The sides of the internal splicing adhesive strip are evenly spaced with elastic elliptical holes. A connecting fan-shaped bladder is fixedly connected to the middle of one side of the internal splicing adhesive strip. The connecting fan-shaped bladder is filled with an inner filling strip. Both sides of the inner filling strip are embedded with filling airbags. A rectangular connecting frame is embedded in the middle of the inner side of the inner filling strip. An elastic splicing strip is snapped into the middle of the inner side of the rectangular connecting frame. A counterweight ball is evenly and uniformly sleeved on the middle of the outer side of the elastic splicing strip.

[0011] Preferably, the outer arc surface of the connecting fan-shaped bladder is tightly fitted to the outer side of the inner protective rubber layer, and the side surface of the filling inner strip is tightly fitted to the inner protective rubber layer.

[0012] Preferably, the outer side of the filling airbag is tightly fitted to the inner wall of the filling inner strip, and a gap is left between the outer side of the elastic splicing strip and the counterweight sphere and the inner wall of the rectangular connecting frame.

[0013] Preferably, a method for preparing a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable includes the following steps: S1. The inner insulation layer is tightly wrapped around the outside of the inner conductor by an extrusion device, the inner shielding layer is wrapped around the outside of the inner insulation layer by a winding device, and then the inner protective rubber layer is wrapped around the outside of the inner shielding layer by an extrusion device to complete the installation of the internal components of the cable. S2. The connecting fan-shaped bladder is attached to the side of the internal conductor by the central connecting rubber strip, the connecting soft rubber strip and the connecting triangular rubber strip to achieve positioning between multiple internal conductors. The rubber bundling layer is wrapped around the outside of the internal shielding layer by the extrusion equipment to complete the assembly of the internal components of the low-voltage cable. S3. The silicone isolation layer and the outer rubber protective layer are sequentially wrapped onto the outside of the rubber bundle layer using an extrusion device, and the arc-shaped connecting strip and the components connected to it are sequentially snapped into the rectangular splicing groove using a splicing device, thus combining the inner isolation layer and the middle protective layer. S4. The inner isolation layer and the middle protective layer are wrapped together on the outside of the supporting isolation strip using the wrapping equipment. Finally, the outer protective mesh is woven and wrapped on the outside of the middle protective layer using the weaving equipment to complete the overall production of the low-voltage cable. S5. Test the various performance characteristics of the cable using appropriate testing equipment. Once all parameters of the cable meet the production standards, collect and store the completed cable.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use. 1. An outer multi-gap protective isolation mechanism is set up. Through the cooperation of the various components inside the outer multi-gap protective isolation mechanism, the heat dissipation process of the low-voltage cable is optimized. Through the multi-layer splicing structure design on the outside of the cable, the outer area of ​​the cable naturally forms a cavity for gas flow during use. This ensures that the cable can directly transfer and conduct heat through the internal airflow during use. The internal cavity of the cable is used to axially transfer heat at the cable bundle, effectively preventing local heat accumulation during use. The splicing deformable structure design between the inner isolation layer and the middle protective layer allows hot air to be quickly discharged directly from the side of the cable during heat dissipation, effectively preventing heat accumulation and overheating during use. This ensures that the cable can be maintained within a suitable temperature range during continuous use, thereby effectively improving the service life of the cable. Meanwhile, by utilizing the spliced ​​structure design of the external cooling circulating fan for the cable, the number of cooling circulating fans can be increased or decreased as needed. This ensures that the cable has good heat dissipation performance while effectively controlling costs. Furthermore, by utilizing the side heat dissipation and side exhaust characteristics of the cable, the cable installed in a narrow space can be cleaned and dried by the self-exhaust airflow, thereby improving the working environment of the cable, indirectly increasing the service life of the cable, and further enhancing the environmental adaptability of the cable. Furthermore, by utilizing the flexible buffer structure composed of the supporting insulating strip and the inner insulating layer, the cable is cushioned by the elastic deformation of the supporting insulating strip and the inner insulating layer when subjected to external instantaneous impact. The outer side of the cooling circulating fan is protected by the rectangular mounting cover and the dustproof end net, further improving the safety of the cable's external components.

[0015] 2. An internal dynamic protection mechanism is set up. Through the cooperation between the various components inside the internal dynamic protection mechanism, the isolation and protection process inside the cable is optimized. Through the cooperation between the flexible structures connected to the central connecting rubber strip and the external connecting soft rubber strip, the stability of the internal structure of the cable is effectively improved, ensuring that the components inside the cable will not creep or shift randomly during use, thus effectively improving the overall service life of the cable. Meanwhile, by utilizing the movable structural design inside the connecting fan-shaped capsule, the kinetic energy generated during the cable traction and swinging process is transferred and consumed through the expansion and contraction of the elastic splicing strip and the movement of the counterweight sphere. The inertia of the counterweight sphere is used to apply an additional reaction force to the swinging cable, thereby effectively reducing the amplitude of cable swaying and preventing loosening of the cable connection during use, thus effectively improving the safety of the cable connection.

[0016] In summary, the overall protection process of the cable is optimized through the cooperation between the various components of the outer multi-gap protective isolation mechanism and the internal dynamic protective mechanism. The combined internal material guiding structure allows heat to be transferred and dissipated through internal airflow during heat dissipation, effectively preventing heat concentration during use and improving the cable's heat dissipation performance. Furthermore, by actively controlling the intensity of the internal airflow, the airflow can flow axially or laterally as needed, thereby cooling the cable's interior while simultaneously cleaning the external environment, further expanding the cable's functionality and effectively improving its overall protective performance. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the end face of the present invention; Figure 3 This is a schematic diagram of the structure for installing the internal protective rubber layer of the present invention; Figure 4 This is a side view of the structure of the present invention; Figure 5 This is a schematic diagram of the structure of the outer multi-gap protective isolation mechanism of the present invention; Figure 6 This is a schematic diagram of the structure for installing the connecting sector-shaped bladder according to the present invention; Figure 7 This is a schematic diagram of the installation structure of the cooling circulation fan of the present invention; Figure 8 This is a schematic diagram of the internal structure of the inner isolation layer of the present invention; Figure 9 This is a schematic diagram of the structure supporting the installation of the isolation strip of the present invention; Figure 10 This is a schematic diagram of the internal dynamic protection mechanism of the present invention; Figure 11 This is a schematic diagram of the structure inside the connecting fan-shaped bladder of the present invention; Figure 12 This is a flowchart of the cable production process of the present invention; The diagram labels are: 1. Inner conductor; 2. Inner insulation layer; 3. Inner shielding layer; 4. Inner protective rubber layer; 5. Rubber binding layer. 6. Outer multi-gap protective isolation mechanism; 601. Silicone isolation layer; 602. Outer rubber protective layer; 603. Rectangular splicing groove; 604. Connecting strip; 605. Reinforcing rubber strip; 606. Arc-shaped connecting rubber strip; 607. Bending notch; 608. Supporting isolation rubber strip; 609. Auxiliary connecting cable; 610. Inner isolation layer; 611. Middle protective layer; 612. Outer protective mesh; 613. Inner rectangular guide channel; 614. Inner rectangular insert; 615. Middle rectangular guide channel; 616. Middle rectangular insert; 617. Arc-shaped mounting cover; 618. Splicing bolt; 619. Inner air guide channel; 620. Cooling circulating fan; 621. Rectangular mounting cover; 622. Dustproof end net; 7. Internal dynamic protection mechanism; 701. Central connecting rubber strip; 702. Connecting soft rubber strip; 703. Connecting triangular rubber strip; 704. Internal splicing rubber strip; 705. Elastic elliptical hole; 706. Connecting fan-shaped bladder; 707. Inner filling strip; 708. Filling air bladder; 709. Rectangular connecting frame; 710. Elastic splicing strip; 711. Counterweight sphere. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Example: Figure 1-11As shown, the present invention provides a technical solution, a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable, including an inner conductor 1, an inner insulation layer 2 tightly wrapped around the outer side of the inner conductor 1, an inner shielding layer 3 tightly wrapped around the outer side of the inner insulation layer 2, an inner protective rubber layer 4 tightly wrapped around the outer side of the inner shielding layer 3, and multiple strands of the inner protective rubber layer 4 are collectively wrapped around a rubber binding layer 5. The rubber binding layer 5 is provided with an outer multi-gap protective isolation mechanism 6. The outer multi-gap protective isolation mechanism 6 is used to isolate and protect the outside of the cable, and to continuously and efficiently cool the outside of the cable through a continuous flow of air to improve the overall heat dissipation effect of the cable. The outer multi-gap protective isolation mechanism 6 includes a silicone isolation layer 601, an outer rubber protective layer 602, a rectangular splicing groove 603, a connecting strip 604, a reinforcing strip 605, an arc-shaped connecting strip 606, a bending notch 607, a supporting isolation strip 608, an auxiliary connecting cable 609, an inner isolation layer 610, a middle protective layer 611, an outer protective mesh 612, an inner rectangular guide groove 613, an inner rectangular insert 614, a middle rectangular guide groove 615, a middle rectangular insert 616, an arc-shaped mounting cover 617, splicing bolts 618, an inner air guide groove 619, a cooling circulating fan 620, a rectangular mounting cover 621, and a dustproof end net 622; The outer side of the rubber binding layer 5 is tightly covered with a silicone isolation layer 601, and the outer side of the silicone isolation layer 601 is tightly covered with an outer rubber protective layer 602. Rectangular splicing grooves 603 are evenly and equidistantly opened on the outer side of the outer rubber protective layer 602 along the circumferential direction. Elastic expansion grooves are evenly opened on the outer side of the silicone isolation layer 601. The outer side of the silicone isolation layer 601 and the inner wall of the outer rubber protective layer 602 are tightly bonded together. A connecting strip 604 is bonded inside the rectangular splicing groove 603. The connecting strip 604 is filled with a reinforcing strip 605. An arc-shaped connecting strip 606 is fixedly connected to one side of the connecting strip 604. A bending notch 607 is evenly and equidistantly opened on one side of the arc-shaped connecting strip 606 along the axial direction. The gap between the rectangular splicing groove 603 and the silicone isolation layer 601 is filled with connecting adhesive. The inner arc surface of the arc-shaped connecting strip 606 is tightly bonded to the outer side of the outer rubber protective layer 602. A support and isolation strip 608 is evenly embedded in the middle of one side of the arc-shaped connecting strip 606, and an auxiliary connecting cable 609 is interspersed among the multiple support and isolation strips 608. The outer side of the supporting isolation strip 608 is tightly covered by an inner isolation layer 610, the outer side of the inner isolation layer 610 is tightly covered by a middle protective layer 611, and the outer side of the middle protective layer 611 is tightly covered by an outer protective mesh 612. The inner layer 610 has an inner rectangular guide groove 613 evenly distributed on its outer side, and an inner rectangular insert 614 is evenly bonded to the outer side of the inner layer 610. The middle protective layer 611 has a middle rectangular guide groove 615 evenly distributed on its inner side, and a middle rectangular insert 616 is evenly bonded to the inner side of the middle protective layer 611. The inner rectangular guide groove 613 and the middle rectangular insert 616 are interlocked with each other in corresponding positions, and the inner rectangular insert 614 and the middle rectangular guide groove 615 are interlocked with each other in corresponding positions. The outer protective mesh 612 is woven from waterproof chemical fiber. The outer rubber protective layer 602 has arc-shaped mounting covers 617 symmetrically snapped onto both ends. The ends of the two arc-shaped mounting covers 617 are threaded with splicing bolts 618. The inner arc surface of the arc-shaped mounting cover 617 is evenly and equidistantly provided with air guide grooves 619. The sides of the two arc-shaped mounting covers 617 are tightly fitted together, and the sides of the air guide grooves 619 correspond to the supporting isolation rubber strips 608. A cooling circulating fan 620 is embedded in the center of the side of the arc-shaped mounting cover 617. The cooling circulating fan 620 is powered by an external power source. A rectangular mounting cover 621 is snapped onto the side of the arc-shaped mounting cover 617 at the position corresponding to the outer side of the cooling circulating fan 620. A dustproof end mesh 622 is embedded in one end of the inner side of the rectangular mounting cover 621. A gap is left between the outer side of the cooling circulating fan 620 and the inner cavity of the rectangular mounting cover 621. The side of the dustproof end mesh 622 is flush with the end face of the rectangular mounting cover 621. Through the cooperation of the various components inside the outer multi-gap protective isolation mechanism 6, the heat dissipation process of the low-voltage cable is optimized. Through the multi-layer splicing structure design on the outside of the cable, the cable is protected during use. The layer area naturally forms a cavity for gas flow, which ensures that the cable can directly transfer and conduct heat through the internal airflow during use. The internal cavity of the cable is used to axially transfer heat at the cable bundle, which effectively prevents local heat accumulation during use. The deformable splicing structure between the inner isolation layer 610 and the middle protective layer 611 allows hot air to be quickly discharged directly from the side of the cable during heat dissipation, which effectively prevents heat accumulation and overheating during use. This ensures that the cable can be maintained within a suitable temperature range during continuous use, thereby effectively improving the service life of the cable. Meanwhile, by utilizing the spliced ​​structure design of the external cooling circulating fan 620 for the cable, the number of cooling circulating fans 620 can be increased or decreased as needed. This ensures that the cable has good heat dissipation performance while effectively controlling costs. Furthermore, by utilizing the cable's side heat dissipation and side exhaust characteristics, the cable installed in a narrow space can be cleaned and dried by the self-exhaust airflow characteristics, thereby improving the overall working environment of the cable, indirectly increasing the cable's service life, and further enhancing the cable's environmental adaptability. Furthermore, by utilizing the flexible buffer structure composed of the supporting insulating strip 608 and the inner insulating layer 610 external components, the cable is buffered by the elastic deformation of the supporting insulating strip 608 and the inner insulating layer 610 when subjected to external instantaneous impact. The outer side of the cooling circulating fan 620 is protected by the rectangular mounting cover 621 and the dustproof end net 622, which further improves the safety of the cable's external components. The rubber bundle layer 5 is equipped with an internal dynamic protection mechanism 7. The internal dynamic protection mechanism 7 is used to provide flexible support for the inside of the cable and to provide buffer protection for the cable by utilizing the movable characteristics of the support components, so as to improve the stress condition of the cable. The internal dynamic protection mechanism 7 includes a central connecting rubber strip 701, a connecting soft rubber strip 702, a connecting triangular rubber strip 703, an internal splicing rubber strip 704, an elastic elliptical hole 705, a connecting fan-shaped bladder 706, an inner filling strip 707, a filling air bladder 708, a rectangular connecting frame 709, an elastic splicing strip 710, and a counterweight sphere 711. A central connecting strip 701 is provided in the middle of the inner side of the rubber binding layer 5. A connecting soft strip 702 is uniformly sleeved on the outer side of the central connecting strip 701 along the axial direction. A connecting triangular strip 703 is fixedly connected at the end of the connecting soft strip 702 corresponding to the position on the outer side of the central connecting strip 701. An internal splicing strip 704 is embedded and bonded to the middle of the three sides of the connecting triangular adhesive strip 703. The middle of the side of the internal splicing strip 704 is provided with elastic elliptical holes 705 at equal intervals. A connecting fan-shaped bladder 706 is fixedly connected to the middle of one side of the internal splicing strip 704. The connecting sector-shaped bladder 706 is filled with an inner filling strip 707. The outer arc surface of the connecting sector-shaped bladder 706 is tightly fitted with the outer side of the inner protective rubber layer 4, and the side of the inner filling strip 707 is tightly fitted with the inner protective rubber layer 4. Both sides of the inner filling strip 707 are embedded with filling airbags 708. A rectangular connecting frame 709 is embedded in the middle of the inner side of the inner filling strip 707. An elastic splicing strip 710 is snapped into the middle of the inner side of the rectangular connecting frame 709. A counterweight ball 711 is evenly sleeved on the middle of the outer side of the elastic splicing strip 710. The outer side of the filling airbag 708 is tightly fitted to the inner wall of the inner filling strip 707. There is a gap between the outer side of the elastic splicing strip 710 and the counterweight ball 711 and the inner wall of the rectangular connecting frame 709. Through the mutual cooperation between the components inside the internal dynamic protection mechanism 7, the isolation and protection process inside the cable is optimized. Through the mutual cooperation between the flexible structures connected to the outside of the central connecting rubber strip 701 and the connecting soft rubber strip 702, the stability of the internal structure of the cable is effectively improved, ensuring that the components inside the cable will not creep or shift randomly during use, and effectively improving the overall service life of the cable. Meanwhile, by utilizing the movable structural design inside the connecting fan-shaped bag 706, the kinetic energy generated during the cable traction and swinging process is transferred and consumed through the extension and retraction of the elastic splicing strip 710 and the movement of the counterweight ball 711. The inertia of the counterweight ball 711 is used to apply an additional reaction force to the swinging cable, thereby effectively reducing the amplitude of cable swaying and preventing the cable connection from becoming loose during use, thus effectively improving the safety of the cable connection. like Figure 12 As shown, a method for preparing a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable includes the following steps: S1. The inner insulation layer 2 is tightly wrapped around the outside of the inner conductor 1 by an extrusion device, the inner shielding layer 3 is wrapped around the outside of the inner insulation layer 2 by a winding device, and then the inner protective rubber layer 4 is wrapped around the outside of the inner shielding layer 3 by an extrusion device to complete the installation of the internal components of the cable. S2. The connecting fan-shaped bag 706 is snapped onto the side of the inner conductor 1 by the central connecting rubber strip 701 in conjunction with the connecting soft rubber strip 702 and the connecting triangular rubber strip 703, so as to realize the positioning between multiple inner conductors 1. The rubber bundling layer 5 is wrapped around the outside of the inner shielding layer 3 by the extrusion equipment to complete the assembly of the internal components of the low voltage cable. S3. The silicone isolation layer 601 and the outer rubber protective layer 602 are sequentially wrapped onto the outside of the rubber binding layer 5 by the extrusion equipment, and the arc-shaped connecting strip 606 and the components connected thereto are sequentially snapped into the rectangular splicing groove 603 by the splicing equipment, and the inner isolation layer 610 and the middle protective layer 611 are combined. S4. The inner isolation layer 610 and the middle protective layer 611 are wrapped together on the outside of the supporting isolation strip 608 by the wrapping equipment. Finally, the outer protective mesh 612 is woven and wrapped on the outside of the middle protective layer 611 by the weaving equipment to complete the overall production of the low-voltage cable. S5. Test the various performance characteristics of the cable using appropriate testing equipment. Once all parameters of the cable meet the production standards, collect and store the completed cable.

[0021] The working principle and usage process of this invention: In the actual application process, when producing low-voltage cables, the inner insulation layer 2 is tightly wrapped around the outside of the inner conductor 1 by an extrusion device, and then the inner shielding layer 3 is wrapped around the outside of the inner insulation layer 2 by a winding device. Then, the inner protective rubber layer 4 is wrapped around the outside of the inner shielding layer 3 by an extrusion device to complete the initial installation of the cable. When it is necessary to assemble the internal components of the cable, the connecting fan-shaped bag 706 is snapped onto the side of the internal conductor 1 by the central connecting rubber strip 701 in conjunction with the connecting soft rubber strip 702 and the connecting triangular rubber strip 703, so as to achieve positioning between multiple internal conductors 1. The rubber bundling layer 5 is then wrapped around the outside of the internal shielding layer 3 by the extrusion equipment to complete the assembly of the internal components of the low-voltage cable. Furthermore, when it is necessary to install the external components of the cable, the silicone insulating layer 601 and the outer rubber protective layer 602 are sequentially wrapped around the outside of the rubber bundle layer 5 using an extrusion device. The arc-shaped connecting strip 606 and the components connected to it are sequentially snapped into the rectangular splicing groove 603 using a splicing device. Then, the inner insulating layer 610 and the middle protective layer 611 are combined and spliced. The inner insulating layer 610 and the middle protective layer 611 are then wrapped around the outside of the supporting insulating strip 608 using a wrapping device. Finally, the outer protective mesh 612 is woven and wrapped around the outside of the middle protective layer 611 using a braiding device to complete the overall production and assembly of the low-voltage cable. When the cable needs to be installed and used, the inner conductor 1 needs to be connected to a suitable position first to ensure that the inner conductor 1 can be energized normally during use. Then, the outer components of the outer rubber protective layer 602 are cut off by cutting equipment to leave sufficient installation space in the outer area of ​​the cable. Then, the arc-shaped mounting cover 617 and its internal components are installed on the outside of the cable by splicing bolts 618, thereby realizing the combined installation of the cable's external components. When active heat dissipation is required during cable use, the heat inside the cable is guided outward by the silicone insulating layer 601 and the outer rubber protective layer 602. The heat overflowing from the inside of the cable is further guided outward by the reinforcing rubber strip 605, the arc-shaped connecting rubber strip 606 and the supporting insulating rubber strip 608 to increase the overall heat dissipation area of ​​the cable. Then, the cooling circulating fan 620 continuously blows airflow into the arc-shaped mounting cover 617, and the airflow inside the arc-shaped mounting cover 617 is guided into the side gap of the supporting insulating rubber strip 608 through the air guide groove 619. This allows the cooling airflow to flow continuously along the inside of the cable and continuously exchange heat with the arc-shaped connecting rubber strip 606 and the supporting insulating rubber strip 608 during the flow of the cooling airflow, so that the heat inside the cable can be quickly removed. When high-speed heat dissipation is required inside the cable, multiple sets of cooling circulating fans 620 simultaneously blow air into the cable, thereby increasing the overall pressure inside the inner insulating layer 610. Utilizing the expansion and contraction characteristics of the inner insulating layer 610, the middle protective layer 611, and the outer protective mesh 612, the inner insulating layer 610 and the middle protective layer 611 deform with different amounts of expansion and contraction. During the expansion and contraction deformation of the inner insulating layer 610 and the middle protective layer 611, the inner rectangular guide groove 613 and the middle rectangular insert 616 are separated from the inner rectangular insert 614 and the middle rectangular guide groove 615, thus connecting the inner cavities of the inner insulating layer 610 and the middle protective layer 611. This allows the airflow inside the inner insulating layer 610 to be discharged outwards sequentially through the inner rectangular guide groove 613 and the middle rectangular guide groove 615, and finally discharged to the side of the cable from the small gaps on the side of the outer protective mesh 612, thereby achieving rapid heat dissipation inside the cable. Meanwhile, the structure of the arc-shaped connecting strip 606 and the supporting isolation strip 608 is optimized by the bending notch 607 and the auxiliary connecting cable 609 to ensure that each internal component can bend normally when the cable is bent. The cavity structure formed by the supporting isolation strip 608 and the outer components of the inner isolation layer 610 forms a flexible protective layer on the outside of the cable, which effectively improves the cable's ability to resist instantaneous impact and enhances its protective capabilities. Furthermore, when multiple cables are bundled together, causing the inner isolation layer 610 and the middle protective layer 611 to be unable to be separated and connected during heat dissipation, the hot air can be quickly transported axially through the cavity inside the inner isolation layer 610, allowing the hot air to leave the cable bundle area quickly and be discharged from the side of the loosely arranged cable, effectively improving the cable's environmental adaptability. When internal protection of the cable is required, the internal splicing strip 704 and its connected components are snapped onto the outside of the internal protective rubber layer 4 by the central connecting rubber strip 701 and the connecting soft rubber strip 702. The connecting fan-shaped bladder 706 provides flexible support to the outside of the internal protective rubber layer 4, thereby isolating and limiting the internal conductor 1 and preventing the internal conductor 1 from shifting during cable use. When auxiliary stabilization is needed for cables that are twisting and swaying due to traction, the filling airbag 708 is attached to the side of the inner conductor 1 via the filling inner strip 707. The expansion and contraction characteristics of the filling airbag 708 absorb and buffer the kinetic energy generated during the twisting of the inner conductor 1. The elastic splicing strip 710 and the counterweight ball 711 are attached to the inside of the filling inner strip 707 via the rectangular connecting frame 709. When the cable bends and shakes due to the movement of external equipment, the rectangular connecting frame 709 will simultaneously drive the elastic splicing strip 710 and the counterweight ball 711 during the initial shaking. The counterweight sphere 711 oscillates synchronously, and by utilizing the telescoping characteristics of the elastic splicing strip 710 and the movable characteristics of the counterweight sphere 711, when the cable experiences secondary swaying, the inertia of the counterweight sphere 711 applies a force to the cable in the opposite direction of the swaying, thereby effectively reducing the amplitude of the cable's continuous swaying. Furthermore, during the sliding process of the counterweight sphere 711 within the rectangular connecting frame 709, the telescoping of the elastic splicing strip 710 further dissipates the kinetic energy of the counterweight sphere 711, thereby further improving the overall stability of the cable.

[0022] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable, comprising an internal conductor (1), characterized in that: The inner conductor (1) is sequentially covered with an inner insulation layer (2), an inner shielding layer (3) and an inner protective rubber layer (4), and multiple strands of the inner protective rubber layer (4) are collectively covered with a rubber binding layer (5). The rubber bundle layer (5) is provided with an outer multi-gap protective isolation mechanism (6). The outer multi-gap protective isolation mechanism (6) is used to isolate and protect the outside of the cable and to continuously and efficiently cool the outside of the cable through a continuous flow of air to improve the overall heat dissipation effect of the cable. The outer multi-gap protective isolation mechanism (6) includes a silicone isolation layer (601); The rubber binding layer (5) is covered with a silicone isolation layer (601) and an outer rubber protective layer (602). The outer rubber protective layer (602) has rectangular splicing grooves (603) evenly spaced along the circumferential direction on its outer side. The rectangular splicing groove (603) is bonded with a connecting strip (604), the connecting strip (604) is filled with a reinforcing strip (605), and an arc-shaped connecting strip (606) is fixedly connected to one side of the connecting strip (604). The arc-shaped connecting strip (606) has a bend notch (607) evenly spaced along the axial direction on one side. A support isolation strip (608) is evenly embedded in the middle of one side of the arc-shaped connecting strip (606), and an auxiliary connecting cable (609) is interspersed among the multiple support isolation strips (608).

2. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 1, characterized in that, The silicone isolation layer (601) has elastic expansion grooves evenly distributed on its outer side, and the outer side of the silicone isolation layer (601) is tightly bonded to the inner wall of the outer rubber protective layer (602).

3. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 1, characterized in that, The gap between the rectangular splicing groove (603) and the silicone isolation layer (601) is filled with connecting adhesive, and the inner arc surface of the arc-shaped connecting adhesive strip (606) is tightly bonded to the outer side of the outer rubber protective layer (602).

4. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 1, characterized in that, The outer side of the supporting isolation strip (608) is tightly covered with an inner isolation layer (610), the outer side of the inner isolation layer (610) is tightly covered with a middle protective layer (611), and the outer side of the middle protective layer (611) is tightly covered with an outer protective mesh (612). The inner layer isolation layer (610) has an inner rectangular guide groove (613) evenly opened on the outer side, and an inner rectangular insert (614) is evenly bonded to the outer side of the inner layer isolation layer (610). The middle layer protective layer (611) has a middle rectangular guide groove (615) evenly opened on the inner side, and a middle rectangular insert (616) is evenly bonded to the inner side of the middle layer protective layer (611). The inner rectangular guide groove (613) and the middle rectangular insert (616) are positioned and interlocked with each other, the inner rectangular insert (614) and the middle rectangular guide groove (615) are interlocked with each other, and the outer protective mesh fabric (612) is woven from waterproof chemical fiber.

5. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 4, characterized in that, The outer rubber protective layer (602) has arc-shaped mounting covers (617) symmetrically snapped onto both ends of the outer side. The ends of the two arc-shaped mounting covers (617) are fitted with splicing bolts (618) by threads. The inner arc surface of the arc-shaped mounting cover (617) is provided with air guide grooves (619) at equal intervals. The two arc-shaped mounting covers (617) fit tightly together, and the side of the air guide groove (619) corresponds to the supporting isolation strip (608).

6. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 5, characterized in that, A cooling circulating fan (620) is embedded in the middle of the side of the arc-shaped mounting cover (617). The cooling circulating fan (620) is powered by an external power source. A rectangular mounting cover (621) is snapped onto the side of the arc-shaped mounting cover (617) at the position corresponding to the outer side of the cooling circulating fan (620). A dustproof end net (622) is embedded in one end of the inner side of the rectangular mounting cover (621). There is a gap between the outer side of the cooling circulating fan (620) and the inner cavity of the rectangular mounting cover (621), and the side of the dustproof end net (622) is flush with the end face of the rectangular mounting cover (621).

7. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 6, characterized in that, The rubber bundle layer (5) is provided with an internal dynamic protection mechanism (7). The internal dynamic protection mechanism (7) is used to provide flexible support for the inside of the cable and to provide buffer protection for the cable by utilizing the movable characteristics of the support components, so as to improve the stress condition of the cable. The internal dynamic protection mechanism (7) includes a central connecting strip (701). A central connecting strip (701) is provided in the middle of the inner side of the rubber binding layer (5). A connecting soft strip (702) is uniformly sleeved on the outer side of the central connecting strip (701) along the axial direction. A connecting triangular strip (703) is fixedly connected to the end of the connecting soft strip (702) at the position corresponding to the outer side of the central connecting strip (701). The connecting triangular adhesive strip (703) has an internal splicing adhesive strip (704) embedded and bonded in the middle of its three sides. The internal splicing adhesive strip (704) has elastic elliptical holes (705) evenly spaced in the middle of its side. A connecting fan-shaped bladder (706) is fixedly connected to the middle of one side of the internal splicing adhesive strip (704). The connecting fan-shaped bladder (706) is filled with an inner filling strip (707). In the inner filling strip (707), an air bladder (708) is embedded on both sides. A rectangular connecting frame (709) is embedded in the middle of the inner side of the inner filling strip (707). An elastic splicing strip (710) is snapped into the middle of the inner side of the rectangular connecting frame (709). A counterweight ball (711) is evenly and equidistantly sleeved on the middle of the outer side of the elastic splicing strip (710).

8. The flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 7, characterized in that, The outer arc surface of the connecting fan-shaped bag (706) is closely fitted with the outer side of the inner protective rubber layer (4), and the side of the filling inner strip (707) is closely fitted with the inner protective rubber layer (4).

9. A flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 7, characterized in that, The outer side of the filling airbag (708) is tightly fitted to the inner wall of the filling inner strip (707), and there is a gap between the outer side of the elastic splicing strip (710) and the counterweight ball (711) and the inner wall of the rectangular connecting frame (709).

10. A method for preparing a flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable, used to prepare the flame-retardant, low-smoke, halogen-free, environmentally friendly low-voltage cable according to claim 7, characterized in that, Includes the following steps: S1. The inner insulation layer (2) is tightly wrapped around the outside of the inner conductor (1) by the extrusion equipment, the inner shielding layer (3) is wrapped around the outside of the inner insulation layer (2) by the winding equipment, and then the inner protective rubber layer (4) is wrapped around the outside of the inner shielding layer (3) by the extrusion equipment to complete the installation of the internal components of the cable. S2. The connecting fan-shaped bag (706) is snapped onto the side of the inner conductor (1) by the central connecting rubber strip (701) in conjunction with the connecting soft rubber strip (702) and the connecting triangular rubber strip (703) to achieve positioning between multiple inner conductors (1), and the rubber bundling layer (5) is wrapped around the outside of the inner shielding layer (3) by the extrusion equipment to complete the assembly of the internal components of the low voltage cable. S3. The silicone isolation layer (601) and the outer rubber protective layer (602) are sequentially wrapped around the outside of the rubber bundle layer (5) by the extrusion equipment, and the arc-shaped connecting strip (606) and the components connected thereto are sequentially snapped into the rectangular splicing groove (603) by the splicing equipment, and the inner isolation layer (610) and the middle protective layer (611) are combined. S4. The inner isolation layer (610) and the middle protective layer (611) are wrapped together on the outside of the supporting isolation strip (608) by the wrapping equipment. Finally, the outer protective mesh (612) is woven and wrapped on the outside of the middle protective layer (611) by the weaving equipment to complete the overall production of the low-voltage cable. S5. Test the various performance characteristics of the cable using appropriate testing equipment. Once all parameters of the cable meet the production standards, collect and store the completed cable.

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