A tensile-resistant, termite-proof elevator cable
By introducing tensile-resistant design and termite-proof measures into elevator cables, the flexibility, tensile strength, and anti-gnawing performance of elevator cables are improved, solving the safety hazards of traditional elevator cables in high humidity and termite-infested environments, and achieving higher operational reliability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI CHANGSHUN ELEVATOR CABLE CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-03
Smart Images
Figure CN224457698U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of elevator cable technology, and in particular to a tensile-resistant, termite-proof elevator cable. Background Technology
[0002] As an important piece of equipment in modern buildings that carries the vertical transportation of people and goods, the safety and reliability of elevators directly affect the safety of people's lives and property. Elevator cables need to run back and forth inside the shaft for a long time, so they not only need to have excellent flexibility and fatigue resistance, but also need to meet strict fire safety requirements such as flame retardancy, fire resistance, low smoke and halogen-free.
[0003] Meanwhile, since elevator shafts are usually located at the bottom or in the mezzanine of a building structure, their environment is characterized by high humidity, large temperature fluctuations, and the potential threat of termites and other organisms gnawing. Traditional elevator cable designs often focus on fire resistance or abrasion resistance, but pay insufficient attention to the comprehensive requirements of termite resistance, anti-gnawing, and high axial tensile strength. This can easily lead to termite erosion of the internal conductors or protective layers of the cable, thereby weakening electrical insulation performance and even causing safety accidents such as short circuits. Utility Model Content
[0004] The purpose of this invention is to improve the operational safety and reliability of elevators by introducing tensile strength and termite resistance designs, while meeting the performance requirements of elevator systems for flexibility, fire resistance, flame retardancy and electromagnetic interference resistance.
[0005] To achieve the above objectives, this utility model adopts the following technical solution: a tensile-resistant, termite-proof elevator cable, comprising multi-strand stranded soft copper wire conductors and a low-smoke halogen-free flame-retardant insulation layer covering its outer ring. The outer ring of the insulation layer is sequentially provided with a flame-retardant isolation strip, a multi-layer fire-resistant mica tape wrapping layer, and a low-smoke halogen-free oxygen barrier layer.
[0006] The outer ring of the low-smoke halogen-free oxygen barrier layer is equipped with a tin-plated copper wire braided shielding layer, and the braided structure contains aramid yarn.
[0007] At least one tensile reinforcing core is placed inside the shielding layer, and the shielding layer is covered with a low-smoke, halogen-free, flame-retardant outer sheath containing a natural termite repellent.
[0008] As a further description of the above technical solution: the natural termite repellent uses microencapsulated capsaicin, which is evenly distributed in the outer sheath material, and achieves the repellent effect on termites by slowly releasing irritating odor and burning sensation.
[0009] As a further description of the above technical solution: the tensile reinforcing core can adopt one of the following three structural forms: galvanized high-strength steel wire rope, non-metallic aramid yarn bundle, or a composite structure of steel wire rope and aramid yarn bundle.
[0010] As a further description of the above technical solution: the shielding layer is woven from tin-plated copper wire and aramid yarn, wherein the proportion of aramid yarn in the woven structure is 10% to 30%, so as to synergistically enhance the electromagnetic shielding performance and tensile strength.
[0011] As a further description of the above technical solution: the oxygen barrier layer is made of a halogen-free flame-retardant material composed of an aluminum-magnesium composite. When exposed to fire, it decomposes and releases moisture, and generates a dense alumina carbonized layer, thereby achieving a self-extinguishing effect.
[0012] As a further description of the above technical solution: the mica tape wrapping layer is tightly wrapped using a slanted or flat wrapping process, and forms a continuous fire-resistant barrier after being heated and cured with adhesive.
[0013] As a further description of the above technical solution: the conductor is formed by twisting multiple oxygen-free copper wires with a diameter of 0.20mm in the same direction to form a flexible flat conductor core.
[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0015] 1. The flexible flat conductor, composed of multiple strands of stranded soft copper wire, has both high conductivity and bending resistance, which can meet the flexibility requirements of long-term reciprocating motion of elevators and significantly reduce the risk of metal fatigue fracture.
[0016] 2. The tin-plated copper wire braided shielding layer interwoven with aramid yarn not only provides reliable electromagnetic interference shielding, but also significantly improves the axial tensile strength of the cable through the synergistic effect of the aramid yarn and the reinforcing core, meeting the elevator application requirements of different loads and lifting heights.
[0017] 3. Microencapsulated natural capsaicin termite repellent is introduced into the outer sheath. Through physical encapsulation and slow-release technology, it achieves immediate repellency and continuous protection against termites, preventing gnawing and damage, and extending the service life of the cable. Attached Figure Description
[0018] Figure 1 A fabric diagram of this utility model is shown;
[0019] Figure 2 A schematic diagram of the conductor and reinforcing core of this utility model is shown.
[0020] Legend:
[0021] 10. Conductor; 11. Insulation layer; 12. Insulation strip; 13. Mica tape wrapping layer; 14. Oxygen barrier layer; 15. Shielding layer; 16. Reinforcing core; 17. Outer sheath. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0023] Please see Figures 1-2 This utility model provides a technical solution: a tensile-resistant termite-proof elevator cable, the structure of which from the inside out consists of the following layers: multi-strand stranded soft copper wire conductor 10, low-smoke halogen-free flame-retardant insulation layer 11, flame-retardant isolation strip 12, multi-layer fire-resistant mica tape wrapping layer 13, low-smoke halogen-free oxygen barrier layer 14, tin-plated copper wire braided shielding layer containing aramid yarn 15, and at least one internal tensile-resistant reinforcing core 16, and a low-smoke halogen-free flame-retardant outer sheath containing natural termite-proof agent 17.
[0024] Conductor 10 is the core of the cable, responsible for transmitting power and signals. Conductor 10 is a flexible flat conductor core, which is made of multiple oxygen-free copper wires with a diameter of, for example, 0.20 mm, twisted together in the same direction. The use of oxygen-free copper wire ensures excellent conductivity and oxidation resistance. The unidirectional twisting structure of multiple fine-diameter copper wires gives conductor 10 excellent flexibility and bending resistance, which can meet the stringent requirements of long-term reciprocating motion of elevators in the shaft and effectively prevent core breakage caused by metal fatigue.
[0025] The insulation layer 11 is directly wrapped around the outer ring of the conductor 10, serving as electrical insulation. The insulation layer 11 is made of low-smoke halogen-free flame-retardant polyolefin material. This material produces very little smoke when burning and does not release corrosive and toxic gases containing halogens. Therefore, in the event of a fire, it can significantly reduce injury to personnel and secondary corrosion to equipment, improve visibility at the fire scene, and facilitate personnel evacuation and rescue.
[0026] Outside the insulation layer 11, a flame-retardant isolation strip 12 is provided. The isolation strip 12 is made of polyester film and its function is to physically isolate the insulated wire core from the subsequent functional layers to prevent them from sticking together during the production process or long-term use, while further enhancing the flame-retardant performance of the entire cable core.
[0027] The multi-layer fire-resistant mica tape wrapping layer 13 is a key structure for the fire resistance performance of the cable. It uses two or more layers of synthetic mica tape, which are tightly wrapped around the outside of the flame-retardant isolation strip 12 with an overlap rate of not less than 50% by oblique wrapping or flat wrapping. After wrapping, the special adhesive contained in the mica tape (such as silicone rubber adhesive) is cured by heating process, thereby forming a continuous, dense and strong shell-shaped fire-resistant barrier. When exposed to flames, the mica tape wrapping layer 13 can maintain its structural integrity and insulation properties at high temperatures, ensuring the normal operation of the circuit within a specified time (e.g., in accordance with GB / T19216 standard), and providing valuable power supply time for fire protection and emergency systems.
[0028] The low-smoke, halogen-free oxygen barrier layer 14 tightly wraps around the mica tape wrapping layer 13, providing active fire protection. This layer is made of a special halogen-free flame retardant containing aluminum-magnesium composite hydroxide. Its fire-retardant principle is as follows: when exposed to high temperatures or flames, aluminum hydroxide and magnesium hydroxide undergo an endothermic decomposition reaction, releasing bound water. The evaporation of this water carries away a large amount of heat, effectively reducing the temperature of the cable surface. At the same time, the dense aluminum oxide and magnesium oxide generated after decomposition form a carbonized layer on the cable surface. This carbonized layer effectively isolates oxygen and prevents the generation of molten drips, thereby achieving a highly efficient flame-retardant and self-extinguishing effect.
[0029] The tin-plated copper wire braided shielding layer 15 is located on the outer ring of the oxygen barrier layer 14 and performs the functions of electromagnetic shielding and auxiliary tensile strength. The shielding layer 15 is braided with tin-plated copper wire. The tin plating layer can effectively prevent the copper wire from oxidizing and facilitate welding. High-strength non-metallic aramid yarn is sandwiched and interwoven in the braided structure.
[0030] Aramid yarn is a synthetic fiber with extremely high strength, low density and excellent abrasion resistance. Aramid yarn accounts for 10% to 30% of the weight or volume of the entire braided structure. By weaving aramid yarn with tin-plated copper wire at a specific angle, the overall axial tensile strength of the cable is greatly improved without significantly increasing the weight of the cable or affecting its flexibility. This composite braided structure enables the shielding layer 15 to not only provide excellent electromagnetic interference protection, but also to work in synergy with the reinforcing core 16 to jointly withstand the tension generated during elevator operation.
[0031] The tensile reinforcing core 16 is the core component of the cable that bears the main tensile load. It is located inside the shielding layer 15 and is arranged parallel to the conductor core of the cable. In order to meet the load and lifting height requirements of different elevators, the tensile reinforcing core 16 can adopt any one or a combination of the following structures:
[0032] Example 1: One or more galvanized high-strength steel wire ropes are used. The galvanizing treatment provides good corrosion resistance, while the high-strength steel wires provide strong tensile strength, making them suitable for elevators with high loads and long strokes.
[0033] Example 2: Non-metallic aramid yarn bundles are used. Aramid yarn bundles are lightweight, have no electromagnetic interference, are corrosion resistant and have high strength. They are suitable for occasions with strict requirements on the overall weight and electromagnetic compatibility of cables, such as high-speed elevators or elevators in special environments.
[0034] Example 3: A combination of steel wire rope and aramid yarn bundles is used. For example, a steel wire rope is at the center and multiple aramid yarn bundles are symmetrically distributed around it. This combination structure can take into account both extremely high tensile strength and certain requirements for weight reduction and flexibility, thus achieving a balance and optimization of performance.
[0035] The low-smoke halogen-free flame-retardant outer sheath 17 is the outermost protective structure of the cable. It is made of low-smoke halogen-free flame-retardant elastomer or polyolefin material, which gives the cable excellent wear resistance, oil resistance and weather resistance, and meets strict flame-retardant requirements. The outer sheath 17 has an active termite prevention function, which is achieved by using microencapsulated natural capsaicin as a termite repellent and dispersing it evenly in the sheath material during the mixing process.
[0036] Microencapsulation technology is a technique that encapsulates natural capsaicin in micron-sized capsules. Its functions are threefold: first, it protects the active ingredient of capsaicin from decomposition and inactivation during the high-temperature extrusion of the sheath material; second, it achieves a slow-release function, as the capsule wall will rupture over time or when termites bite, slowly releasing capsaicin and ensuring the long-lasting termite-repellent effect; and third, it ensures the uniform dispersion of capsaicin in the sheath material.
[0037] When termites attempt to gnaw on the outer sheath 17 of the cable, they damage the microcapsules, causing capsaicin to be released. Capsaicin strongly stimulates the termites' mouthparts and nervous system, producing a burning sensation and irritating odor, thus forcing the termites to give up gnawing and stay away from the cable. This achieves a biological repellency effect beyond physical isolation, fundamentally preventing termites from damaging the elevator cable.
[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A termites resistant elevator cable which is resistant to stretching, characterized in that, It includes a multi-strand stranded soft copper wire conductor (10) and a low-smoke halogen-free flame-retardant insulation layer (11) covering its outer ring. The outer ring of the insulation layer (11) is provided with a flame-retardant isolation strip (12), a multi-layer fire-resistant mica tape wrapping layer (13), and a low-smoke halogen-free oxygen barrier layer (14). The outer ring of the low-smoke halogen-free oxygen barrier layer (14) is provided with a tin-plated copper wire braided shielding layer (15), and the braided structure contains aramid yarn; At least one tensile reinforcing core (16) is provided inside the shielding layer (15), and the shielding layer (15) is provided with a low-smoke halogen-free flame-retardant outer sheath (17) containing a natural termite repellent.
2. A tensile resistant termite resistant elevator cable according to claim 1, characterized in that: The natural termite repellent uses microencapsulated capsaicin, which is evenly distributed in the outer sheath (17) material to repel termites by slowly releasing irritating odor and burning sensation.
3. A tensile resistant termite resistant elevator cable according to claim 1, characterized in that: The tensile reinforcing core (16) can adopt one of the following three structural forms: galvanized high-strength steel wire rope, non-metallic aramid yarn bundle, or a composite structure of steel wire rope and aramid yarn bundle.
4. A tensile resistant termite resistant elevator cable according to claim 1, characterized in that: The shielding layer (15) is woven from tin-plated copper wire and aramid yarn, wherein the proportion of aramid yarn in the woven structure is 10% to 30%, so as to synergistically enhance the electromagnetic shielding performance and tensile strength.
5. A termites resistant elevator cable according to claim 1, characterized in that: The oxygen barrier layer (14) is made of a halogen-free flame-retardant material composed of an aluminum-magnesium composite. When exposed to fire, it decomposes and releases moisture, and generates a dense alumina carbonized layer, thereby achieving a self-extinguishing effect.
6. A tensile resistant termite resistant elevator cable according to claim 1, wherein: The mica tape wrapping layer (13) is tightly wrapped using a slanted or flat wrapping process, and forms a continuous fire-resistant barrier after being heated and cured with adhesive.
7. A termites resistant elevator cable according to claim 1, characterized in that: The conductor (10) is formed by twisting together multiple oxygen-free copper wires with a diameter of 0.20 mm in the same direction to form a flexible flat conductor core.