Green double-insulated TPU anti-UV flame retardant pre-branched special cable

Abstract

The present invention relates to the field of cable technology, in particular to a green double-insulated TPU anti-ultraviolet flame-retardant pre-branched special cable, comprising a main cable, wherein the main cable comprises two main conductor core units arranged at relative intervals, a grounding core unit is arranged between the two main conductor core units, and control core units are respectively arranged above and below the grounding core units, and a TPU insulation layer is extruded and coated around the periphery of each main conductor core unit, the grounding core unit and the control core unit, and a TPU outer protective layer is extruded and coated around the periphery of the TPU insulation layer. The special cable structure designed in the present invention can be easily bent and is suitable for special and complex working conditions, and the flat structure can ensure better protection during dragging when the plane contacts the ground; the symmetrical arrangement of the dual main conductor core units and the symmetrical arrangement of the dual control core units can ensure the rationality and balance of the conductor spacing layout.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a green double-insulated TPU anti-ultraviolet flame-retardant pre-branching special cable. Background Art

[0002] Cables are categorized differently based on their intended use and environment. For example, power cables are primarily used for high-voltage electrical energy transmission, with voltage levels ranging from 220V to 500kV. Control cables are used to transmit control signals and are widely used in industrial automation systems.

[0003] Cables suitable for specific environments, such as mining cables, marine cables and nuclear-grade cables, are generally called special cables. These cables are designed with different materials and structures to meet diverse application requirements.

[0004] Most of the special cables currently used on the market are based on the traditional two-layer or multi-layer overlapping mica tape wrapping process. When encountering a fire, this type of cable product will produce a large amount of thick smoke, which is not conducive to the evacuation of personnel. In addition, the flame retardant material coating inside the wire core assembly is poor, and the safety of the cable during use cannot be guaranteed.

[0005] Furthermore, a search revealed numerous solutions to the aforementioned issues in the prior art. For example, patent publication number CN206558256U discloses a flame-retardant control cable. This cable primarily improves flame retardancy and fracture resistance by configuring the insulation layer structure to include a skeleton and an extruded insulating layer extruded around and covering the skeleton. The skeleton is constructed as a mesh structure woven from flame-retardant fibers.

[0006] In summary, it can be seen that the above-mentioned cable products can improve their flame retardant performance and safety during use to a certain extent, but they still have the following problems:

[0007] The single-core conductor used is difficult to bend during the bending process, and the conductor is prone to breakage after repeated bending.

[0008] There is an annular cavity inside the semi-ring body, and inert particles are placed in the cavity. There will be gaps and relative movement between the particles inside this structure, which makes the structural strength of the entire cable less balanced. The weak parts are prone to damage first, affecting its overall service life.

[0009] Based on this, the present invention optimizes and improves the cable safety issues in the prior art, and hereby proposes a green double-insulated TPU anti-UV flame retardant pre-branched special cable to better solve the problems existing in the prior art. Summary of the Invention

[0010] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: a green double-insulated TPU anti-UV flame-retardant pre-branching special cable, including a main cable, the main cable including two main conductor core units arranged relatively at intervals, a grounding core unit is arranged between the two main conductor core units, and control core units are respectively arranged on the upper and lower parts of the grounding core units. The periphery of each of the main conductor core units, the grounding core unit and the control core units is extruded and coated with a TPU insulation layer, and the periphery of the TPU insulation layer is extruded and coated with a TPU outer protective layer.

[0011] In any of the above solutions, preferably, the main conductor core unit includes a main twisted conductor formed by twisting a plurality of copper conductors, a main insulation layer is wrapped around the outside of the main twisted conductor, and a conductor shielding layer is coated on the periphery of the main insulation layer.

[0012] In any of the above solutions, it is preferred that the conductor shielding layer is made of a mixture of metal wires and flame-retardant fibers.

[0013] In any of the above solutions, it is preferred that a main conductor EVA fastening layer is coated on the periphery of the main insulating layer.

[0014] In any of the above solutions, preferably, the main conductor EVA fastening layer is formed by extrusion of EVA material and the interior of the EVA material is filled with mixed flame retardant particles.

[0015] By filling the main conductor EVA fastening layer with flame retardant particles, it can better play a flame retardant effect and avoid the occurrence of high temperature natural conditions.

[0016] During normal use, the main conductor EVA fastening layer securely encases the main twisted conductors and conductor shielding. When the cable's internal temperature reaches 85-100°C, the main conductor EVA fastening layer softens and lubricates the TPU insulation and conductor shielding, reducing resistance between the main conductor core unit and the TPU insulation. This effectively protects the main conductor core unit's inner structure and extends its service life against bending and shaking at high temperatures. Furthermore, the EVA layer maintains its toughness and elasticity in cold conditions, effectively providing insulation and protecting the internal conductors.

[0017] In any of the above solutions, preferably, the grounding core unit includes a grounding copper conductor, a grounding insulation layer is coated on the periphery of the grounding copper conductor, and a grounding shielding layer is coated on the periphery of the grounding insulation layer.

[0018] In any of the above solutions, preferably, the ground shielding layer includes a non-metallic braided layer made of flame-retardant fibers by 3D weaving, and a grounded EVA elastic layer is coated on the periphery of the non-metallic braided layer.

[0019] The grounding EVA elastic layer is extruded from EVA material. The EVA elastic layer effectively protects the grounding shield layer, the inner grounding insulation layer, and the grounding copper conductor, effectively serves as a flame retardant, and maintains the bending flexibility of the grounding copper conductor.

[0020] In any of the above schemes, it is preferred that the control core unit includes a core conductor, a core insulation layer is coated on the periphery of the core conductor, a core protective layer is arranged on the periphery of the core insulation layer, and a core outer shielding layer is extruded on the periphery of the core protective layer, and the cross-sectional profile of the core outer shielding layer is a flat structure.

[0021] In any of the above schemes, it is preferred that an inner braided layer is provided between the wire core insulation layer and the wire core protective layer; the inner braided layer is formed by twisting metal wires and flame retardant fibers, and the inner and outer surfaces of the inner braided layer are sprayed with an asphalt layer.

[0022] The core conductor and the insulation layer are surrounded by a core protective layer to effectively protect the internal core. At the same time, the outer shielding layer of the core and the inner braided layer of the core can double shield the external signal. In addition, the inner braided layer of the core is formed by twisting metal wire and flame retardant fiber to improve the overall structural strength of the core conductor and effectively ensure the service life of the control core unit.

[0023] In any of the above solutions, preferably, the TPU insulation layer consists of an inner insulation layer and an outer insulation layer, and a copper wire winding layer extruded and coated on the periphery of the inner insulation layer is further provided between the inner insulation layer and the outer insulation layer.

[0024] In any of the above solutions, preferably, the inner surface and the outer surface of the copper wire winding layer are both pressed and embedded inside the inner insulating layer and the outer insulating layer.

[0025] When wrapping the copper wire winding layer, the copper wire is controlled to be in a heated state. During the wrapping process, the winding pressure is controlled so that the copper wire winding layer is pressed into the surface of the inner insulating layer, thereby increasing the wrapping stability and fixing effect of the copper wire winding layer.

[0026] In any of the above solutions, preferably, the cross-sectional profile of the line connecting the respective center lines of the two control core units and the two main conductor core units is rhombus-shaped.

[0027] In any of the above solutions, preferably, a nylon sheath layer is further provided between the TPU insulating layer and the TPU outer protective layer.

[0028] In any of the above schemes, it is preferred that a plurality of semicircular protrusions are evenly arranged along the circumference of the outer surface of the nylon sheath layer, and the inner side wall of the TPU outer protective layer is extruded and coated on the periphery of each semicircular protrusion.

[0029] The green double-insulated TPU anti-UV flame-retardant pre-branched special cable also includes a branch cable unit, which is arranged on the main cable. The branch cable unit is composed of two branch cables. The inner ends of the conductors in each branch cable are connected to the corresponding main twisted conductors inside the main conductor core unit of the main cable as needed. An insulating sheath is sleeved on the connection and lead-out part of each branch cable and the main cable. The two branch cables pass through the insulating sheaths at the corresponding positions and are arranged side by side.

[0030] In any of the above schemes, it is preferred that a metal protective cover is respectively clamped on the main cables outside the two insulating sheaths, and the metal protective cover consists of two symmetrically arranged half covers; a round neck section is provided at the lower end of the metal protective cover, and the two branch cables are led out from the bottom outlet of the round neck section, and an insulating layer is pre-formed on the surface of each branch cable, an inner insulating protective layer is filled in the filling cavity inside the metal protective cover, and an outer insulating protective layer is formed on the outer surface of the metal protective cover.

[0031] Preferably, in any of the above solutions, a signal shielding coating is sprayed on both the inner surface and the outer surface of the metal protective cover.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The special cable structure designed in the present invention can be easily bent and is suitable for special and complex working conditions. The flat structure can ensure that it can provide better protection during the dragging process when the flat surface contacts the ground.

[0034] 2. The special cable of the present invention adopts a symmetrical arrangement of dual main conductor core units and dual control core units to ensure the rationality and balance of the conductor spacing layout. At the same time, using this layout to wrap the ground wire in the center can provide a common reference point for the entire circuit system, greatly reducing the interference caused by inconsistent reference points; it is crucial for the stability of complex circuit systems under the working conditions of special cables; in addition, setting the ground wire conductor in the center of the cable can enhance the mechanical strength of the ground wire copper conductor and form a stable conductive path connected to the ground in the center of the cable.

[0035] 3. The dual-control core unit spacing setting can better manage the characteristic impedance of the cable by precisely controlling the distance between conductors; controlling the impedance of the cable to match the impedance of the connected device can effectively reduce signal reflections and ensure the reliability and efficiency of data transmission.

[0036] 4. The spacing setting of the dual-main conductor core units can effectively reduce crosstalk, effectively reduce internal interference, and better match the cable's anti-interference ability during high-frequency signal transmission in a complex electromagnetic environment; in addition, the conductor configuration of the spacing setting can offset or disperse the electromagnetic influence of external interference sources to a certain extent, and maintain stable signal transmission.

[0037] 5. The pre-branch cable structure installed on the main cable uses a dual-branch cable structure that is independently led out and then protected by a metal protective cover and then closed together to effectively protect the connection of the branch cables, ensuring the strength of the connection and the effectiveness of signal interference resistance, thereby extending the service life of the connection. The special cable of this invention is suitable for complex installation environments, such as those with dense pipelines or where frequent movement and bending are required.

[0038] 6. The symmetrical spacing of the dual main conductor core units and the symmetrical spacing of the dual control core units in the present invention can provide a more stable and reliable transmission path for electronic signals by fixing the corresponding conductor positions, which helps to reduce signal attenuation and distortion, and is particularly suitable for special scenarios of long-distance transmission and high-speed data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or components are generally identified by similar reference numerals throughout the drawings. Elements or components in the drawings are not necessarily drawn to scale.

[0040] Figure 1 This is a schematic diagram of the main cable cross-sectional structure of the green double-insulated TPU anti-UV flame-retardant pre-branching special cable of the present invention.

[0041] Figure 2 This is a structural schematic diagram of the green double-insulated TPU anti-UV flame-retardant pre-branched special cable of the present invention.

[0042] Figure 3 This is a schematic diagram of the internal structure of the green double-insulated TPU anti-UV flame-retardant pre-branched special cable of the present invention.

[0043] In the figure, 1. Main cable; 2. TPU insulation layer; 201. Inner insulation layer; 202. Outer insulation layer; 3. TPU outer protective layer; 4. Main twisted conductor; 401. Copper conductor; 5. Main insulation layer; 6. Conductor shielding layer; 7. Main conductor EVA fastening layer; 8. Grounding copper conductor; 9. Grounding insulation layer; 10. Grounding shielding layer; 11. Core conductor; 12. Core insulation layer; 13. Core protective layer; 14. Core outer shielding layer; 15. Core inner braiding layer; 16. Copper wire winding layer; 17. Nylon sheath layer; 18. Branch cable; 19. Insulation sheath; 20. Metal protective cover; 2001. Round neck section; 21. Inner insulation protective layer; 22. Outer insulation protective layer. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only used as examples and are not intended to limit the scope of protection of the present invention. Figure 1-Figure 3 As shown in .

[0045] Example 1: A green double-insulated TPU anti-UV flame-retardant pre-branched special cable, comprising a main cable 1, wherein the main cable 1 comprises two main conductor core units arranged relatively spaced apart, a grounding core unit is arranged between the two main conductor core units, and control core units are respectively arranged on the upper and lower parts of the grounding core units. A TPU insulation layer 2 is extruded and coated on the periphery of each of the main conductor core units, the grounding core unit and the control core units, and a TPU outer protective layer 3 is extruded and coated on the periphery of the TPU insulation layer 2.

[0046] This cable features a double-layer insulation design, with both the inner and outer layers made of thermoplastic polyurethane (TPU), and the outer layer also infused with UV-resistant material. This makes the entire main cable 1 resistant to oil, abrasion, water, and heat, effectively protecting the internal conductors from environmental influences. A flame retardant is added to the TPU outer protective layer 3, giving it excellent flame retardancy and effectively preventing the spread of flames.

[0047] The double-layer insulation structure formed by the TPU insulation layer 2 and the TPU outer protective layer 3 can not only prevent current leakage, but also resist ultraviolet erosion and extend the life of the cable.

[0048] The main cable 1 in this green double-insulated TPU anti-UV flame-retardant pre-branching special cable adopts TPU insulation layer 2 and TPU outer protective layer 3 to achieve outer double insulation protection. At the same time, the TPU outer protective layer 3 can improve the UV resistance and flame retardant performance of the entire cable, effectively ensuring the use strength and service life of the entire main cable 1 structure.

[0049] The cross-sectional profile of the entire main cable 1 is a flat structure, and the two sides of the middle section adopt a planar structure parallel to each other, which can ensure the stability of the cable when bending toward both sides, effectively reducing its bending difficulty while improving the protection effect of the entire cable structure.

[0050] In any of the above schemes, preferably, the main conductor core unit includes a main twisted conductor 4 formed by twisting a plurality of copper conductors 401 , a main insulating layer 5 is wrapped around the outside of the main twisted conductor 4 , and a conductor shielding layer 6 is wrapped around the periphery of the main insulating layer 5 .

[0051] In any of the above solutions, it is preferred that the conductor shielding layer 6 is made of a mixture of metal wires and flame-retardant fibers.

[0052] The conductor shielding layer 6 is made of a mixture of metal wire and flame retardant fiber to ensure that a metal mesh shielding structure is formed outside the insulation layer while forming a preliminary flame retardant woven structure made of flame retardant fiber mesh, thereby achieving preliminary shielding and preliminary flame retardancy.

[0053] The structural strength of the main twisted conductor 4 can be improved, so that the main insulating layer 5 and the main twisted conductor 4 can have a certain displacement gap when in use, effectively reducing the difficulty of bending and improving the flexibility of bending.

[0054] In any of the above solutions, it is preferred that the periphery of the main insulating layer 5 is coated with a main conductor EVA fastening layer 7 .

[0055] In any of the above solutions, preferably, the main conductor EVA fastening layer 7 is formed by extrusion of EVA material and the interior of the EVA material is filled with flame retardant particles.

[0056] The main conductor EVA fastening layer 7 is filled with flame retardant particles to achieve a better flame retardant effect and avoid the occurrence of high temperature natural conditions.

[0057] During normal use, the main conductor EVA fastening layer 7 securely encases the main twisted conductors 4 and the conductor shielding layer 6. When the internal cable temperature reaches 85-100°C, the main conductor EVA fastening layer 7 softens and lies between the TPU insulation layer 2 and the conductor shielding layer 6, acting as a lubricant. This reduces the mutual resistance between the main conductor core unit and the TPU insulation layer 2, effectively protecting the main conductor core unit's inner structure and extending its service life against bending and shaking at high temperatures. Furthermore, the cable maintains its toughness and elasticity in cold conditions, effectively providing insulation and protecting the internal conductors.

[0058] In any of the above solutions, preferably, the grounding core unit includes a grounding copper conductor 8 , the outer periphery of the grounding copper conductor 8 is coated with a grounding insulation layer 9 , and the outer periphery of the grounding insulation layer 9 is coated with a grounding shielding layer 10 .

[0059] In any of the above solutions, preferably, the ground shielding layer 10 includes a non-metallic braided layer made of flame-retardant fibers by 3D weaving, and a grounded EVA elastic layer is coated on the periphery of the non-metallic braided layer.

[0060] The grounding EVA elastic layer is formed by extrusion of EVA material. The EVA elastic layer can effectively protect the grounding shielding layer 10 and the inner grounding insulation layer 9 and the grounding copper conductor 8, effectively play the role of flame retardant and maintain the bending flexibility of the grounding copper conductor 8.

[0061] In any of the above schemes, it is preferred that the control core unit includes a core conductor 11, a core insulation layer 12 is coated on the periphery of the core conductor 11, a core protective layer 13 is arranged on the periphery of the core insulation layer 12, and a core outer shielding layer 14 is extruded on the periphery of the core protective layer 13, and the cross-sectional profile of the core outer shielding layer 14 is a flat structure.

[0062] In any of the above schemes, it is preferred that an inner braided layer 15 is provided between the core insulation layer 12 and the core protective layer 13; the inner braided layer 15 is formed by twisting metal wires and flame-retardant fibers, and an asphalt layer is sprayed on the inner and outer surfaces of the inner braided layer 15.

[0063] The asphalt layer can be softened when the cable temperature rises, effectively serving the purpose of lubrication and guidance, ensuring relatively small movement of the cable core insulation layer 12 and protecting it; wherein the thickness of the asphalt layer is 1-2 mm.

[0064] The core conductor 11 and the outer periphery of the insulation layer are provided with a core protective layer 13 to effectively protect the internal core. At the same time, the outer shielding layer 14 of the core cooperates with the inner braided layer 15 of the core to achieve the purpose of double shielding of external signals. In addition, the inner braided layer 15 of the core is formed by twisting metal wire and flame retardant fiber to improve the overall structural strength of the core conductor 11 and effectively ensure the service life of the control core unit.

[0065] Setting the core protection layer 13 on the inner side of the core inner braided layer 15 can better complete the small-diameter covering of the core conductor 11 inside the core insulation layer 12, and restrain and limit the inside of the core conductor 11; at the same time, it cooperates with the outer core inner braided layer 15 to further enhance the structural strength of the cable from the outside; while strengthening its structure, it relies on the flat structure to take into account its bendability when bending, avoiding breakage and damage caused by the cable being difficult to bend under low temperature conditions.

[0066] In any of the above schemes, preferably, the TPU insulation layer 2 consists of an inner insulation layer 201 and an outer insulation layer 202 , and a copper wire winding layer 16 extruded and wrapped around the outer periphery of the inner insulation layer 201 is further provided between the inner insulation layer 201 and the outer insulation layer 202 .

[0067] In any of the above solutions, preferably, the inner surface and the outer surface of the copper wire winding layer 16 are both pressed and embedded inside the inner insulating layer 201 and the outer insulating layer 202 .

[0068] When wrapping the copper wire winding layer 16, the copper wire is controlled to be in tension and kept in a heated state. During the wrapping process, the winding pressure is controlled so that the copper wire winding layer 16 is pressed into the surface of the inner insulating layer 201, thereby increasing the wrapping stability and fixing effect of the copper wire winding layer 16.

[0069] In any of the above solutions, preferably, the cross-sectional profile of the line connecting the respective center lines of the two control core units and the two main conductor core units is rhombus-shaped.

[0070] In any of the above solutions, preferably, a nylon sheath layer 17 is further provided between the TPU insulating layer 2 and the TPU outer protective layer 3 .

[0071] In any of the above schemes, it is preferred that a plurality of semicircular protrusions 1701 are evenly provided on the outer surface of the nylon sheath layer 17 along its circumference, and the inner side wall of the TPU outer protective layer 3 is extruded and coated on the periphery of each semicircular protrusion 1701.

[0072] By providing a plurality of semicircular protrusions 1701 , the twisting and deformation of the TPU outer protective layer 3 can be effectively prevented, while ensuring that the structural strength of the entire main cable 1 is enhanced.

[0073] Example 2: Compared with Example 1, the difference of this example is:

[0074] The green double-insulated TPU anti-UV flame-retardant pre-branched special cable also includes a branch cable unit, which is arranged on the main cable 1. The branch cable unit is composed of two branch cables 18. The inner ends of the conductors in each branch cable 18 are connected to the corresponding main twisted conductors 4 inside the main conductor core unit of the main cable 1 as needed. An insulating sheath 19 is sleeved on the connection and lead-out part of each branch cable 18 and the main cable 1. The two branch cables 18 pass through the insulating sheaths 19 at the corresponding positions and are arranged side by side.

[0075] When forming the branch cable 18 , the cross-sectional size and length of the main cable 1 and the branch cable 18 can be customized according to user needs, flexibly adapting to the requirements of different power distribution systems.

[0076] In any of the above schemes, it is preferred that a metal protective cover 20 is respectively clamped on the main cable 1 outside the two insulating sheaths 19, and the metal protective cover 20 is composed of two symmetrically arranged half covers; a round neck section 2001 is provided at the lower end of the metal protective cover 20, and the two branch cables 18 are both led out from the bottom outlet of the round neck section 2001, and an insulating layer is pre-formed on the surface of each branch cable 18, and an inner insulating protective layer 21 is filled in the filling cavity inside the metal protective cover 20, and an outer insulating protective layer 22 is formed on the outer surface of the metal protective cover 20.

[0077] The installation of the metal shield 20, consisting of two halves, provides rigid protection, internal protection at the connection point, and signal shielding. Furthermore, by filling the inner insulating protective layer 21 within the metal shield, the connection between the branch cable 18 and the main cable 1 is better secured, while also providing additional internal insulation protection. Furthermore, an outer insulating protective layer 22 formed on the exterior of the metal shield 20 provides additional terminal insulation protection on the outer surface, further ensuring the safety of the branch cable 18 connection.

[0078] In any of the above solutions, preferably, a signal shielding coating is sprayed on both the inner surface and the outer surface of the metal protective cover 20 .

[0079] The signal shielding coating can further ensure the shielding protection effect of the internal conductor connection parts.

[0080] The special cable structure designed in the present invention can be easily bent and is suitable for special and complex working conditions. The flat structure can ensure that it can provide better protection during the dragging process when the flat surface contacts the ground.

[0081] The pre-branch cable 18 provided on the main cable 1 utilizes a dual-branch cable 18 that is independently led out and then protected by a metal shield 20 before being brought together to effectively protect the connection of the branch cables 18, ensuring the strength and resistance to signal interference of the connection, and extending the service life of the connection. The special cable of the present invention is suitable for complex installation environments, such as those with dense pipelines or where frequent movement and bending are required.

[0082] From the above, it can be seen that the special cable structure designed in the present invention can be easily bent and is suitable for special and complex working conditions. The flat structure can ensure that it can provide better protection during dragging when the plane contacts the ground.

[0083] Special cables employ a symmetrical arrangement of dual main conductor core units and dual control core units to ensure a reasonable and balanced conductor spacing layout. This arrangement also places the ground conductor at the center, providing a common reference point for the entire circuit system, significantly reducing interference caused by inconsistent reference points. This is crucial for the stability of complex circuit systems under special cable operating conditions. Furthermore, placing the ground conductor at the center of the cable enhances the mechanical strength of the ground copper conductor 401 and forms a stable conductive path to the ground at the center of the cable. The dual control core unit spacing precisely controls the distance between conductors, enabling better management of the cable's characteristic impedance. Matching the cable's impedance to that of the connected equipment effectively reduces signal reflections, ensuring reliable and efficient data transmission. By fixing the corresponding conductor positions, the symmetrical spacing of the dual main conductor core units and dual control core units provides a more stable and reliable transmission path for electronic signals, helping to reduce signal attenuation and distortion. This arrangement is particularly suitable for long-distance and high-speed data transmission scenarios. The pre-branch cable 18 structure provided on the main cable 1 adopts the method of leading out two branch cables 18 separately and then putting them together after being protected by the metal protective cover 20 to effectively protect the connection part of the branch cables 18, thereby ensuring the strength of the connection part and the effect of resisting signal interference, and extending the service life of the connection part. The special cable of the present invention can be applied to complex installation environments, such as places with dense pipelines or where frequent movement and bending are required.

[0084] The spacing setting of the dual main conductor core units can effectively reduce crosstalk, effectively reduce internal interference, and better match the cable's anti-interference ability during high-frequency signal transmission in a complex electromagnetic environment; in addition, the spacing-set conductor configuration can offset or disperse the electromagnetic influence of external interference sources to a certain extent, maintaining stable signal transmission.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the scope of protection of the present invention.

[0086] Any matters not described in detail in the present invention are well-known technologies to those skilled in the art.

Claims

1. Green double-insulated TPU anti-UV flame retardant pre-branched special cable, characterized by: The main cable comprises two main conductor core units spaced apart from each other, a grounding core unit is provided between the two main conductor core units, and control core units are provided above and below the grounding core units, respectively. A TPU insulation layer is extruded and coated around the periphery of each main conductor core unit, the grounding core unit, and the control core unit, and a TPU outer protective layer is extruded and coated around the periphery of the TPU insulation layer. The main conductor core unit comprises a main twisted conductor formed by twisting a plurality of copper conductors, a main insulation layer is wrapped around the outer periphery of the main twisted conductor, and a conductor shielding layer is wrapped around the outer periphery of the main insulation layer. The control core unit includes a core conductor, a core insulation layer is coated on the periphery of the core conductor, a core protection layer is arranged on the periphery of the core insulation layer, and a core outer shielding layer is extruded on the periphery of the core protection layer; the cross-sectional profile of the core outer shielding layer is a flat structure; A wire core inner braided layer is provided between the wire core insulation layer and the wire core protective layer; the wire core inner braided layer is formed by twisting metal wires and flame retardant fibers, and an asphalt layer is sprayed on the inner surface and the outer surface of the wire core inner braided layer; The asphalt layer can soften when the cable temperature rises, thus serving as a lubricant and guide; The outer periphery of the main insulating layer is coated with a main conductor EVA fastening layer, which is formed by extrusion of EVA material and filled with flame retardant particles; the main conductor EVA fastening layer is filled with flame retardant particles to achieve a flame retardant effect and avoid the occurrence of high-temperature spontaneous combustion; When the internal temperature of the cable reaches 85-100℃, the main conductor EVA fastening layer softens and is located between the TPU insulation layer and the conductor shielding layer to play a lubricating role, reducing the mutual resistance between the main conductor core unit and the TPU insulation layer, ensuring the protection of the inner structure of the main conductor core unit, and extending the service life of the main conductor core unit when it bends and shakes under high temperature; it can maintain toughness and elasticity in cold conditions, playing a role in heat preservation and protection of the internal conductor; The TPU insulation layer is composed of an inner insulation layer and an outer insulation layer, and a copper wire winding layer is provided between the inner insulation layer and the outer insulation layer and is extruded and coated on the periphery of the inner insulation layer; the inner and outer surfaces of the copper wire winding layer are both pressed and embedded in the inner and outer insulation layers; when wrapping the copper wire winding layer, the copper wire is controlled to be in a tensioned and heated state, and the winding pressure is controlled during the wrapping process so that the copper wire winding layer is pressed and embedded in the surface layer of the inner insulation layer, thereby increasing the wrapping stability and fixing effect of the copper wire winding layer; It also includes a branch cable unit, which is arranged on the main cable. The branch cable unit is composed of two branch cables. The inner ends of the conductors in each branch cable are connected to the corresponding main twisted conductors inside the main conductor core unit of the main cable as needed. An insulating sheath is sleeved on the connection and lead-out part of each branch cable and the main cable. The two branch cables respectively pass through the insulating sheaths at corresponding positions and are arranged side by side.

2. The green double-insulated TPU anti-UV flame-retardant pre-branched special cable according to claim 1 is characterized by: The grounding core unit comprises a grounding copper conductor, a grounding insulation layer is coated on the periphery of the grounding copper conductor, and a grounding shielding layer is coated on the periphery of the grounding insulation layer.

3. The green double-insulated TPU anti-UV flame-retardant pre-branched special cable according to claim 2 is characterized by: The cross-sectional profile of the line connecting the center lines of the two control core units and the two main conductor core units is a diamond shape.

4. The green double-insulated TPU anti-UV flame-retardant pre-branched special cable according to claim 3 is characterized by: A nylon sheath layer is further provided between the TPU insulating layer and the TPU outer protective layer.

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