Low-smoke halogen-free flame-retardant environment-friendly elevator cable

Abstract

This invention relates to the field of elevator cable technology, and in particular to a low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable. It includes an outer protective layer, inside which, from the outside in, are sequentially arranged a metal isolation layer, a fire-resistant reinforcing layer, and a flame-retardant filling layer. The flame-retardant filling layer has several sets of mounting holes evenly distributed circumferentially. Insulated wire cores are fitted into these mounting holes. The insulated wire cores, from the inside out, consist of a copper conductor, a fire-resistant layer, and an insulation layer. The cable also includes a heat dissipation and bending limiting composite structure, disposed on the flame-retardant filling layer, for heat dissipation and limiting the bending amplitude of the flame-retardant filling layer. The heat dissipation and bending limiting composite structure includes several sets of grooves formed on the outer periphery of the flame-retardant filling layer. Each set of grooves is fitted with a rigid, non-elastic, arc-shaped heat dissipation plate. Through the combination of these structures, the cable's flexibility and operational reliability are significantly improved while meeting flame-retardant and low-smoke safety standards.

Description

Technical Field

[0001] This invention relates to the field of elevator cable technology, and in particular to a low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable. Background Technology

[0002] In the field of elevator cabling, low-smoke halogen-free flame-retardant environmentally friendly cables have become standard products in high-rise buildings, public transportation hubs and other densely populated places. Their core requirements are to have three key properties at the same time: flame retardancy, low smoke and flexibility.

[0003] In existing technologies, low-smoke halogen-free flame-retardant cables generally use inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide as the main flame-retardant system. To meet national standards for flame retardant rating and low smoke transmittance, a high proportion of these fillers must be added to the cable material. This directly leads to a significant increase in the hardness of the insulation and sheath materials, and a significant decrease in elasticity and flexibility. During elevator reciprocating operation, the cable is prone to bending and cracking, conductor breakage, and insulation damage. If the amount of inorganic flame retardant is reduced to improve material flexibility, the mandatory standards for flame retardancy and low smoke performance cannot be met. The industry has always faced a triangular contradiction where flame retardancy, low smoke, and flexibility are difficult to achieve simultaneously. The invention patent with authorization announcement number CN109065244B discloses a high-temperature resistant cable for electrical control, which has a traction layer and... The design incorporates a first and second spring between the central heat dissipation plates for buffering and positioning, along with heat dissipation plates and arcs to enhance heat dissipation. However, this design places the springs directly inside the central area of ​​the cable, requiring precise positioning and individual connection with the support blocks and heat dissipation plates during assembly. This process is cumbersome and difficult, hindering large-scale installation and production, and significantly reducing cable manufacturing efficiency and finished product qualification rate. Furthermore, the springs are arranged at a single point in the central radial direction, which only provides single-direction deformation buffering. This fails to adapt to the complex working conditions of elevator cables undergoing multi-directional reciprocating bending, resulting in extremely poor buffering and reset effects. Moreover, it does not address the high rigidity limitation of low-smoke halogen-free flame-retardant materials, failing to resolve the performance triangle contradiction of flame retardancy, low smoke, and flexibility, and thus failing to meet the environmental protection, flame retardancy, safety, and long-term stable operation requirements of elevator cables. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings in the prior art by proposing a low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable includes an outer protective layer. Inside the outer protective layer, from the outside in, are sequentially arranged a metal isolation layer, a fire-resistant reinforcing layer, and a flame-retardant filling layer. The flame-retardant filling layer has several sets of mounting holes evenly distributed circumferentially. Insulated wire cores are fitted into these mounting holes. The insulated wire cores, from the inside out, consist of a copper conductor, a fire-resistant layer, and an insulation layer. The cable also includes: A heat dissipation and bending limiting composite structure is disposed on the flame-retardant filler layer for heat dissipation and limiting the bending range of the flame-retardant filler layer. The heat dissipation and bending limiting composite structure includes several sets of grooves opened on the outer periphery of the flame-retardant filling layer. Each set of grooves is fitted with a rigid non-elastic arc-shaped heat dissipation plate. The two ends of the arc-shaped heat dissipation plate are respectively fixed with slots and buckles. Adjacent arc-shaped heat dissipation plates are rigidly connected and fixed by slots and buckles, and combined to form a ring-shaped heat dissipation component. The arc-shaped heat sink is a hollow rigid structure with several sets of guide posts evenly distributed along the arc direction fixed inside. The guide posts have guide grooves extending along the arc direction inside. Cylindrical rigid sliding sleeve movable parts and return springs are sleeved on the outside of the guide posts. The movable parts are slidably connected to the guide grooves. A high-temperature resistant, halogen-free, flame-retardant aramid fiber pull rope is inserted through the arc-shaped heat sink. The pull rope passes through all the guide posts in the same arc-shaped heat sink, and its two ends are fixedly connected to two sets of end movable parts in the arc-shaped heat sink. The middle section of the pull rope is located inside the guide groove.

[0006] Furthermore, the arc-shaped heat sink is made of a rigid, highly thermally conductive, non-elastic metal material. Multiple sets of arc-shaped heat sinks are arranged in a ring-shaped heat dissipation assembly, which is evenly distributed along the cable axis. At least two rigid protrusions are fixedly provided on the inner arc surface of the arc-shaped heat sink. The outer periphery of the flame-retardant filling layer is provided with matching limiting grooves at positions corresponding to the protrusions. The protrusions and limiting grooves are interference-fitted to achieve circumferential fixed limiting of the arc-shaped heat sink. A groove is provided in the middle of the flame-retardant filling layer. The groove is an axially penetrating independent groove, which is evenly distributed along the circumference of the flame-retardant filling layer and does not communicate with the mounting holes of the insulated wire core.

[0007] Furthermore, the slot is a rigid concave snap-fit ​​groove, and the snap-fit ​​is a rigid convex snap-fit. After the two are rigidly snapped together, they form an approximately seamless circular ring. A gap of 0.1-0.3mm is reserved on the snap-fit ​​surface for cable bending deformation.

[0008] Furthermore, the guide groove is a cylindrical through groove, the axial length of which is consistent with the axial length of the guide post, and the inner diameter of the movable part is adapted to the outer diameter of the guide post.

[0009] Furthermore, the outer protective layer is a halogen-free low-smoke polyolefin jacket, the fire-resistant reinforcing layer is a glass fiber tape, the insulation layer is made of polyolefin material, and the return spring is elastically supported between the inner wall of the arc-shaped heat sink and the end face of the movable part. The return spring is used to absorb deformation stress when the cable is bent, and pushes the movable part to return to its original position along the guide groove after bending, thus assisting the annular heat sink assembly in restoring its initial structure.

[0010] Furthermore, the protrusion is a rectangular rigid boss, and the limiting groove is a groove adapted to the protrusion. The two are tightly fitted to achieve relative fixation between the arc-shaped heat sink and the flame-retardant filling layer.

[0011] Furthermore, the metal isolation layer is a galvanized flexible metal hose, the inner wall of which is tightly fitted to the outer periphery of the fire-resistant reinforcing layer made of fiberglass tape, to achieve structural limitation and mechanical protection.

[0012] Furthermore, the fire-resistant layer is made of double-layered, overlapping fire-resistant mica tape, which is wrapped around the outside of the copper conductor.

[0013] Furthermore, the cross-sectional shape of the slot is rectangular, and the slot independently forms an axially continuous heat dissipation and stress release channel for heat conduction inside the cable and stress dispersion and release during bending, without affecting the installation stability of the insulated core.

[0014] Furthermore, the arc-shaped heat sink has a wall thickness of 0.3-0.8mm, and the inner diameter of the annular heat sink component is adapted to the outer diameter of the flame-retardant filling layer to achieve a tight fit.

[0015] The present invention proposes a low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable, the advantages of which are: This invention achieves a synergistic combination of rigid limiting and flexible deformation through a composite structure of heat dissipation and bending limiting. From a structural design perspective, it breaks through the industry problem that traditional elevator cables cannot simultaneously achieve the three major properties of flame retardancy, low smoke, and flexibility. It can precisely control the bending amplitude of the cable and effectively avoid problems such as cable core twisting, conductor core breakage, and insulation damage caused by excessive bending during the high-frequency reciprocating operation of elevators. While meeting the safety standards of flame retardancy and low smoke, it significantly improves the flexibility and operational reliability of the cable.

[0016] This invention adopts an outer peripheral snap-fit ​​structure design, replacing the complex assembly form of the centrally built-in spring in the prior art. It eliminates the need for precise positioning and docking inside the cable, significantly simplifying the production and assembly process, reducing manufacturing difficulty, adapting to large-scale industrial production, and effectively improving production efficiency and finished product qualification rate. At the same time, this structure can adapt to the complex working conditions of multi-directional reciprocating bending of elevator cables, and the buffering and reset effects are stable and reliable, solving the defects of the existing structure in terms of single buffering and reset failure.

[0017] This invention integrates three major functions: bending limit, heat dissipation, and automatic reset. It rapidly conducts heat from the cable core through rigid components, delaying the aging of the insulation structure. It relies on the cooperation of the pull rope and rigid components to limit excessive bending and protect the internal core. It maintains structural stability with the help of a sliding reset component, ensuring that there are no loosening, deformation, or failure problems during long-term high-frequency operation, thus comprehensively improving the overall performance and service life of the cable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the composition structure of the cable of the present invention; Figure 2 This is a schematic diagram of the disassembly structure of the flame-retardant filler layer of the present invention; Figure 3 This is a schematic diagram of the disassembly structure of the flame-retardant filling layer and the arc-shaped heat dissipation plate of the present invention; Figure 4 This is a cross-sectional view of the arc-shaped heat sink of the present invention. Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the bent structure of the flame-retardant filler layer of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the disassembly structure of the guide post and movable component of the present invention.

[0019] In the diagram: 1. Outer protective layer; 2. Isolation layer; 3. Fire-resistant reinforcing layer; 4. Flame-retardant filling layer; 5. Insulation layer; 6. Fire-resistant layer; 7. Copper conductor; 8. Groove; 9. Arc-shaped heat dissipation plate; 10. Slot; 11. Buckle; 12. Limiting groove; 13. Protrusion; 14. Guide post; 15. Guide groove; 16. Moving part; 17. Pull rope; 18. Return spring; 19. Slot. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Reference Figure 1-8 A low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable includes an outer protective layer 1. Inside the outer protective layer 1, from the outside in, are sequentially arranged a metal isolation layer 2, a fire-resistant reinforcing layer 3, and a flame-retardant filling layer 4. The flame-retardant filling layer 4 has several sets of mounting holes evenly distributed circumferentially. Insulated wire cores are fitted into these mounting holes. The insulated wire cores, from the inside out, consist of a copper conductor 7, a fire-resistant layer 6, and an insulation layer 5. The cable also includes: A heat dissipation and bending limiting composite structure is disposed on the flame-retardant filling layer 4 for heat dissipation and limiting the bending range of the flame-retardant filling layer 4. The heat dissipation and bending limiting composite structure includes several sets of grooves 8 opened on the outer periphery of the flame-retardant filling layer 4. Each set of grooves 8 is fitted with a rigid non-elastic arc-shaped heat dissipation plate 9. The two ends of the arc-shaped heat dissipation plate 9 are respectively fixed with slots 10 and buckles 11. Adjacent arc-shaped heat dissipation plates 9 are rigidly connected and fixed by slots 10 and buckles 11, forming a ring-shaped heat dissipation component. The arc-shaped heat sink 9 is a hollow rigid structure. Several sets of guide posts 14 are fixed inside, evenly distributed along the arc direction. The guide posts 14 have guide grooves 15 extending along the arc direction inside. Cylindrical rigid sliding sleeve movable parts 16 and return springs 18 are sleeved on the outside of the guide posts 14. The movable parts 16 are slidably connected to the guide grooves 15. A high-temperature resistant, halogen-free, flame-retardant aramid fiber pull rope 17 is inserted through the arc-shaped heat sink 9. The pull rope 17 passes through all the guide posts 14 in the same arc-shaped heat sink 9. Its two ends are fixedly connected to two sets of end movable parts 16 in the arc-shaped heat sink 9, and the middle section of the pull rope 17 is located inside the guide grooves 15.

[0022] This cable adopts a multi-layer composite protective structure from the outside in. The outer protective layer 1 provides external abrasion-resistant and flame-retardant protection, the metal isolation layer 2 provides mechanical reinforcement and electromagnetic shielding, and the fire-resistant reinforcing layer 3 and the flame-retardant filling layer 4 work together to achieve internal insulation, flame retardancy, and structural shaping. The circumferentially evenly distributed insulated cores ensure stable power and signal transmission. The core structure of copper conductor 7, fire-resistant layer 6, and insulation layer 5 takes into account both conductivity and fire resistance and insulation. The heat dissipation and bending limit composite structure integrates heat dissipation, bending limit, and reset functions. The groove 8 provides support for the arc-shaped heat dissipation plate 9. The installation and positioning base, the rigid arc heat dissipation plate 9 spliced ​​to form a ring assembly, can not only achieve efficient heat conduction and heat dissipation, but also limit the excessive bending of the cable through the rigid structure. The guide column 14 and guide groove 15 in the hollow structure provide sliding guidance for the moving part 16. The return spring 18 and the pull rope 17 realize the automatic return after bending. The aramid fiber pull rope 17 is high temperature resistant, halogen-free and flame retardant, and is suitable for the environmental protection and working conditions requirements of elevator cables. The overall structure solves the problem that traditional cables are difficult to balance in terms of flame retardancy, low smoke and flexibility. At the same time, it is easy to install and suitable for mass production.

[0023] like Figure 2 , 3 As shown, the arc-shaped heat sink 9 is made of rigid, high thermal conductivity, non-elastic metal. Multiple sets of arc-shaped heat sinks 9 are combined to form a ring-shaped heat dissipation assembly that is evenly distributed along the cable axis. At least two rigid protrusions 13 are fixedly provided on the inner arc surface of the arc-shaped heat sink 9 and evenly distributed along the arc direction. The outer periphery of the flame-retardant filling layer 4 is provided with matching limiting grooves 12 at the corresponding positions of the protrusions 13. The protrusions 13 and the limiting grooves 12 are interference-fitted to achieve circumferential fixed limiting of the arc-shaped heat sink 9. The center of the flame-retardant filling layer 4 is provided with a groove 19, which is an axially penetrating independent groove that is evenly distributed along the circumference of the flame-retardant filling layer 4 and is not connected to the mounting holes of the insulated wire core.

[0024] The rigid, high thermal conductivity, non-elastic metal material can quickly conduct the heat generated by the copper conductor 7 to the outside. At the same time, its rigidity limits the excessive bending of the cable and avoids damage to the cable core. The annular heat dissipation components are evenly distributed along the axial direction, which can realize uniform heat dissipation and bending limit throughout the cable, and improve the operational stability. The rigid protrusion 13 and the limiting groove 12 are interference fit, which can effectively prevent the arc heat dissipation plate 9 from circumferential rotation and axial movement, and ensure that the structure is firmly fixed. The independent through slot 19 does not occupy the installation space of the insulated wire core, and can simultaneously realize internal heat conduction and bending stress release, optimizing the overall performance of the cable.

[0025] like Figure 5 As shown, the slot 10 is a rigid concave snap-fit ​​groove, and the snap 11 is a rigid convex snap. After the two are rigidly snapped together, they form an approximately seamless circular ring. A gap of 0.1-0.3mm is reserved on the snap-fit ​​surface for cable bending deformation.

[0026] The rigid slot 10 and buckle 11 are matched and connected, and a complete circular heat dissipation component can be quickly assembled. The assembly process is simple and the connection strength is high. The connection surface is reserved with a deformation gap of 0.1-0.3mm, which can not only meet the bending flexibility requirements of the cable during normal operation of the elevator, but also achieve limit through rigid contact when the bending amplitude exceeds the limit. It takes into account the cable flexibility and structural protection, and avoids damage to the insulation layer and cable core due to excessive bending.

[0027] like Figure 4 , 8 The guide groove 15 shown is a cylindrical through groove, and its axial length is consistent with the axial length of the guide post 14. The inner diameter of the movable part 16 is adapted to the outer diameter of the guide post 14.

[0028] The cylindrical through-slot structure ensures that the sliding process of the movable part 16 is smooth and stable, without jamming or skew. The guide slot 15 and the guide post 14 are set to the same length, and the dimensions of the movable part 16 and the guide post 14 are precisely matched, which can ensure uniform sliding stroke and stable transmission accuracy, providing structural guarantee for the reliable operation of the reset mechanism.

[0029] like Figure 1 As shown, the outer protective layer 1 is a halogen-free low-smoke polyolefin jacket, the fire-resistant reinforcing layer 3 is a glass fiber tape, the insulation layer 5 is made of polyolefin, and the return spring 18 is elastically supported between the inner wall of the arc-shaped heat sink 9 and the end face of the movable part 16. The return spring 18 is used to absorb deformation stress when the cable is bent, and after bending, it pushes the movable part 16 to return to its original position along the guide groove 15, thus assisting the annular heat sink assembly in restoring its initial structure.

[0030] The outer protective layer 1, fire-resistant reinforcing layer 3, and insulation layer 5 are all made of halogen-free, low-smoke, and environmentally friendly materials. No toxic fumes are released during a fire, meeting the fire protection and environmental protection standards for elevator cables. The return spring 18 is compressed and absorbs deformation stress when the cable is bent, relieving the impact on the internal structure. After bending, it rebounds and pushes the movable part 16 to return to its original position. The pull rope 17 drives the arc-shaped heat dissipation plate 9 to restore the circular structure, continuously ensuring the stability of heat dissipation and limit functions.

[0031] like Figure 3 As shown, the protrusion 13 is a rectangular rigid boss, and the limiting groove 12 is a groove that matches the protrusion 13. The two are tightly fitted to achieve relative fixation between the arc-shaped heat sink 9 and the flame-retardant filling layer 4.

[0032] The rectangular rigid boss and the matching groove are tightly connected, which can achieve a firm fixation without additional fasteners. The installation is convenient and the bonding force is strong. Under the high-frequency reciprocating bending conditions of elevators, it can effectively prevent the arc heat dissipation plate 9 from loosening, shifting or falling off, and ensure the long-term stable operation of the heat dissipation and bending limit structure.

[0033] like Figure 1 As shown, the metal isolation layer 2 is a galvanized flexible metal hose, whose inner wall is tightly fitted to the outer periphery of the fire-resistant reinforcing layer 3 made of fiberglass tape, so as to achieve structural limitation and mechanical protection.

[0034] The galvanized flexible metal hose combines mechanical strength with bending flexibility, and can resist damage from external compression, abrasion, and pulling, providing reliable protection for the internal cable core. The tightly fitted fire-resistant reinforcement layer 3 can achieve structural positioning and auxiliary heat dissipation, while also providing electromagnetic shielding to reduce interference from elevator frequency conversion equipment on signal transmission and ensure stable power and signal transmission.

[0035] like Figure 1 As shown, the fire-resistant layer 6 is made of double-layered overlapping fire-resistant mica tape, which covers the outside of the copper conductor 7.

[0036] The double-layered, overlapping fire-resistant mica tape has excellent insulation properties and is resistant to high temperatures and fire. It can maintain the integrity of the insulation structure in a fire scenario, continuously providing insulation protection for the copper conductor 7, ensuring the normal transmission of power and signals of the fire elevator during a fire, and meeting the requirements of elevator fire safety specifications.

[0037] like Figure 2 As shown, the cross-sectional shape of the slot 19 is rectangular. The slot 19 independently forms an axially continuous heat dissipation and stress release channel, which is used for heat conduction inside the cable and stress dispersion and release during bending, without affecting the installation stability of the insulated core.

[0038] The rectangular cross-section slot 19 increases the heat conduction area, quickly dissipates the internal heat generated by the cable core during operation, and avoids accelerated aging of the insulation layer; when the cable is bent, the slot 19 can disperse the internal compressive stress and prevent the flame-retardant filling layer 4 from deforming and cracking; the independent channel design is not connected to the insulated core mounting hole, does not affect the stability of the core fixation, and takes into account heat dissipation, stress release and insulation safety.

[0039] like Figure 3 As shown, the wall thickness of the arc-shaped heat sink 9 is 0.3-0.8mm, and the inner diameter of the annular heat sink component is adapted to the outer diameter of the flame-retardant filling layer 4 to achieve a tight fit.

[0040] The rigidity of the arc-shaped heat sink 9 and the overall flexibility of the cable can be balanced by a wall thickness range of 0.3-0.8mm, avoiding deformation due to excessively thin walls and reduced cable flexibility due to excessively thick walls. The annular heat dissipation component is tightly bonded to the flame-retardant filling layer 4, maximizing the heat conduction contact area and improving heat dissipation efficiency. At the same time, it ensures that the bending limiting structure is firmly bonded, improving structural reliability.

[0041] Operating principle: When the cable is in operation, the heat generated by the energized copper conductor 7 is conducted through the insulation layer 5 and the fire-resistant layer 6 to the flame-retardant filling layer 4, and then quickly dissipated outward by the rigid, non-elastic arc-shaped heat dissipation plate 9. This, combined with the axially penetrating slot 19 in the center of the flame-retardant filling layer 4, achieves efficient heat dissipation, preventing internal heat accumulation and accelerated insulation aging. When the cable bends due to the reciprocating motion of the elevator, the tension rope 17 inside the arc-shaped heat dissipation plate 9 gradually tightens with the deformation, directly limiting the bending range of the flame-retardant filling layer 4 through its tensile strength. This precisely controls the cable bending range and structurally prevents problems such as cable core twisting, insulation layer cracking, and copper conductor 7 breakage caused by excessive bending of the flame-retardant filling layer 4. When the return spring 18 is compressed, the movable part 16 slides smoothly along the guide groove 15 to adapt to the deformation. After bending, the return spring 18 rebounds and resets, and the movable part 16 drives the pull rope 17 to return to a relaxed state, so that the arc-shaped heat dissipation plate 9 maintains its initial circular structure and continues to play a bending limiting role. At the same time, the cable adopts halogen-free low-smoke flame-retardant material, double-layer fire-resistant mica tape and galvanized flexible metal isolation layer, which simultaneously meets the requirements of environmental protection, flame retardancy, fire resistance, mechanical protection and electromagnetic shielding. On the basis of solving the triangular contradiction of flame retardancy, low smoke and flexibility, it realizes the integrated function of precise bending limit of pull rope, efficient heat dissipation and automatic reset, perfectly adapting to the harsh working conditions of long-term high-frequency reciprocating operation of elevators.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable, comprising an outer protective layer (1), wherein the outer protective layer (1) is provided with a metal isolation layer (2), a fire-resistant reinforcing layer (3), and a flame-retardant filling layer (4) arranged sequentially from the outside to the inside; the flame-retardant filling layer (4) is provided with a plurality of sets of mounting holes evenly distributed circumferentially, wherein an insulated wire core is adapted to be embedded in the mounting holes, and the insulated wire core is, from the inside to the outside, a copper conductor (7), a fire-resistant layer (6), and an insulation layer (5); characterized in that, Also includes: A heat dissipation and bending limiting composite structure is disposed on the flame-retardant filling layer (4) for heat dissipation and limiting the bending range of the flame-retardant filling layer (4); The heat dissipation and bending limiting composite structure includes several sets of grooves (8) opened on the outer periphery of the flame-retardant filling layer (4). Each set of grooves (8) is fitted with a rigid non-elastic arc heat dissipation plate (9). The two ends of the arc heat dissipation plate (9) are respectively fixed with a slot (10) and a buckle (11). Adjacent arc heat dissipation plates (9) are rigidly connected and fixed by the slot (10) and the buckle (11) to form a ring heat dissipation component. The arc-shaped heat sink (9) is a hollow rigid structure. Several sets of guide posts (14) are fixed inside it and evenly distributed along the arc direction. The guide posts (14) have guide grooves (15) extending along the arc direction inside. The guide posts (14) are fitted with cylindrical rigid sliding sleeve movable parts (16) and return springs (18) on the outside. The movable parts (16) are slidably connected to the guide grooves (15). A high-temperature resistant, halogen-free, flame-retardant aramid fiber material pull rope (17) is inserted through the arc-shaped heat sink (9). The pull rope (17) passes through all the guide posts (14) in the same arc-shaped heat sink (9). Its two ends are fixedly connected to two sets of end movable parts (16) in the arc-shaped heat sink (9), and the middle section of the pull rope (17) is located inside the guide groove (15).

2. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The arc-shaped heat sink (9) is made of rigid, high thermal conductivity, non-elastic metal. The annular heat sink assembly composed of multiple arc-shaped heat sinks (9) is distributed at equal intervals along the cable axis. At least two rigid protrusions (13) are fixedly provided on the inner arc surface of the arc-shaped heat sink (9) and are evenly distributed along the arc direction. The flame-retardant filling layer (4) is provided with a matching limiting groove (12) at the corresponding position of the protrusion (13). The protrusion (13) and the limiting groove (12) are interference fit to realize the circumferential fixed limiting of the arc-shaped heat sink (9). The flame-retardant filling layer (4) is provided with a groove (19) in the middle. The groove (19) is an axially penetrating independent groove, evenly distributed along the circumferential direction of the flame-retardant filling layer (4), and is not connected to the mounting hole of the insulated wire core.

3. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The slot (10) is a rigid concave snap-fit ​​slot, and the snap (11) is a rigid convex snap. After the two are rigidly snapped together, they form an approximately seamless circular ring. The snap-fit ​​surface is reserved with a cable bending deformation gap of 0.1-0.3mm.

4. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The guide groove (15) is a cylindrical through groove, and its axial length is consistent with the axial length of the guide post (14). The inner diameter of the movable part (16) is adapted to the outer diameter of the guide post (14).

5. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The outer protective layer (1) is a halogen-free low-smoke polyolefin jacket, the fire-resistant reinforcing layer (3) is a glass fiber tape, the insulation layer (5) is made of polyolefin material, the reset spring (18) is elastically supported between the inner wall of the arc-shaped heat sink (9) and the end face of the movable part (16), the reset spring (18) is used to absorb deformation stress when the cable is bent, and push the movable part (16) to reset along the guide groove (15) after bending, and assist the annular heat sink assembly to restore its initial structure.

6. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The protrusion (13) is a rectangular rigid boss, and the limiting groove (12) is a groove that is adapted to the protrusion (13). The two are tightly fitted to achieve relative fixation of the arc-shaped heat sink (9) and the flame-retardant filling layer (4).

7. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The metal isolation layer (2) is a galvanized flexible metal hose, whose inner wall is tightly fitted to the outer periphery of the fire-resistant reinforcing layer (3) made of glass fiber tape, so as to achieve structural limitation and mechanical protection.

8. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 1, characterized in that, The fire-resistant layer (6) is made of double-layered overlapping fire-resistant mica tape, which is wrapped around the outside of the copper conductor (7).

9. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 2, characterized in that, The cross-sectional shape of the slot (19) is rectangular. The slot (19) independently forms an axially penetrating heat dissipation and stress release channel, which is used for heat conduction inside the cable and stress dispersion and release during bending, and does not affect the installation stability of the insulated core.

10. The low-smoke, halogen-free, flame-retardant, environmentally friendly elevator cable according to claim 2, characterized in that, The arc-shaped heat sink (9) has a wall thickness of 0.3-0.8 mm, and the inner diameter of the annular heat sink component is adapted to the outer diameter of the flame-retardant filling layer (4) to achieve a tight fit.

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