Elevator steel wire rope with regenerated fiber material rope core

Abstract

The invention provides a regenerated fiber material rope core steel wire rope for an elevator. The regenerated fiber material rope core steel wire rope comprises a composite rope core and steel wire strands arranged on the periphery of the composite rope core. The composite rope core comprises regenerated fiber filaments, secondary outer layer filaments and outer layer filaments, the secondary outer layer filaments spirally wrap and twist the regenerated fiber filaments, and the outer layer filaments spirally wrap and twist the secondary outer layer filaments. The steel wire strands comprise secondary outer-layer steel wire strands and outer-layer steel wire strands, the secondary outer-layer steel wire strands spirally wrap and entwist the composite rope core, and the outer-layer steel wire strands spirally wrap and entwist the secondary outer-layer steel wire strands; the regenerated fiber filaments are formed by twisting a plurality of regenerated fiber filaments, and the regenerated fiber filaments are made of modified regenerated high-density polyethylene and carbon fibers. The composite rope core comprises the regenerated fiber yarns, the secondary outer layer yarns and the outer layer yarns, the regenerated fiber yarns can improve toughness and tensile strength of the composite rope core, and the secondary outer layer yarns and the outer layer yarns provide good supporting performance and oil storage capacity and provide enough good lubrication support for steel wire strands of the steel wire rope, so that the overall comprehensive performance of the steel wire rope can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel wire ropes, and in particular to a steel wire rope for elevators using a rope core made of a recycled fiber material. Background Art

[0002] In daily life, elevators are an extremely convenient and common means of transportation, which are widely used in various buildings. Wire rope is a spiral steel wire bundle formed by twisting together multiple strands of steel wires with required mechanical properties and geometric dimensions. It is generally composed of a wire rope core, steel wire and lubricant. In the elevator system, the wire rope is mainly used to connect the elevator car and the counterweight of the elevator. The elevator car runs stably under the traction of the wire rope; therefore, the wire rope is an important part of the entire elevator system. It carries the weight of the elevator car and the counterweight and is a key component of the entire elevator car operation. Therefore, the performance of the elevator wire rope will directly affect the safety of the elevator system operation. The wire rope core plays a major role in maintaining the stable physical structure of the wire rope. At the same time, the wire rope core should also have a good oil-containing capacity so that grease can be released between the steel wires for lubrication, reducing the friction between the steel wires, and extending the service life of the wire rope. The steel wire rope for elevators needs to work with the traction wheel on the elevator for a long time during use. The steel wire rope needs to have good toughness, high strength, and wear resistance. The requirements for the rope core are also higher, requiring the rope core to provide better tensile and support effects, as well as lubrication effects. In order to improve the strength of the rope core, high-strength synthetic fibers are usually used instead of natural fibers.

[0003] Polyethylene fiber refers to a fiber material obtained by spinning polyethylene through a melt spinning method. Polyethylene can be used as a rope core material to improve the overall strength, flexibility and toughness of the wire rope due to its high tensile modulus and strength. With the continuous strengthening of the country's "carbon neutrality" policy and awareness of environmental protection, the treatment and reuse of waste plastics has become an important issue in environmental pollution control. Polyethylene materials not only produce a large amount of solid waste while being used in large quantities. In recent years, there have been many studies on the recycling and utilization of polyethylene waste, mainly including three aspects: direct regeneration, modified regeneration and cracking regeneration of waste polyethylene. Therefore, the present invention is aimed at the recycling and reuse of polyethylene waste, and creatively proposes a regenerated fiber applied to the core of a steel rope to improve the toughness and support core of the rope core, ensure the comprehensive performance of the steel wire rope while achieving reuse, which is beneficial to saving resources and protecting the environment. Summary of the invention

[0004] The purpose of the present invention is to provide a steel wire rope for elevators with a rope core made of recycled fiber material, which utilizes recycled fiber to effectively improve the tensile strength and flexibility of the rope core, has a good oil storage effect, has a reinforcing effect on improving the performance of the steel wire rope, and improves the safety of use and the service life of the steel wire rope.

[0005] The present invention provides a steel wire rope for elevators with a rope core made of a regenerated fiber material, comprising a composite rope core and steel wire strands arranged on the periphery of the composite rope core. The composite rope core comprises regenerated fiber filaments, sub-outer layer filaments and outer layer filaments, the sub-outer layer filaments are spirally wrapped and twisted around the regenerated fiber filaments, and the outer layer filaments are spirally wrapped and twisted around the sub-outer layer filaments. The steel wire strands comprise sub-outer layer steel wire strands and outer layer steel wire strands, the sub-outer layer steel wire strands are spirally wrapped and twisted around the composite rope core, and the outer layer steel wire strands are spirally wrapped and twisted around the sub-outer layer steel wire strands. The regenerated fiber filaments are twisted from a plurality of regenerated fiber filaments, the regenerated fiber filaments are made from modified regenerated high-density polyethylene and carbon fiber, and the diameter of the regenerated fiber filaments is 0.4-0.7 times the diameter of the composite rope core.

[0006] Preferably, the preparation steps of the regenerated fiber filaments are:

[0007] S1: grafting butyl acrylate onto recycled high-density polyethylene to obtain modified recycled high-density polyethylene;

[0008] S2: performing a modification treatment on the carbon fiber, firstly performing a degumming treatment on the carbon fiber to obtain a degummed carbon fiber, and then performing a concentrated nitric acid treatment on the degummed carbon fiber to obtain a modified carbon fiber;

[0009] S3: drying the modified recycled high-density polyethylene and the modified carbon fiber, mixing them in a predetermined ratio, feeding them into a mixing rheometer for granulation to obtain regenerated particles, then vacuum drying the regenerated particles, heating and melting them, extruding and drawing them to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber yarns of a predetermined diameter.

[0010] Preferably, the preparation steps of the modified recycled high-density polyethylene in step S1 are: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added into a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles.

[0011] Preferably, the preparation steps of the modified carbon fiber in step S2 are: soaking the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soaking the degummed carbon fiber in concentrated nitric acid, treating it at 100°C for 100 minutes by condensation reflux, and then filtering the degummed carbon fiber treated with concentrated nitric acid, washing it with clean water for more than 10 times, and then drying it at 100°C to obtain the modified carbon fiber.

[0012] Preferably, in step S3, the added volume ratio of the modified recycled high-density polyethylene and the modified carbon fiber is 95:5 or 90:10 or 85:15 or 80:20 or 75:25 or 70:30.

[0013] Preferably, the secondary outer layer wires include sisal wires and fine galvanized steel wires in a quantitative ratio of 1:1, and the outer layer wires include sisal wires and fine galvanized steel wires in a quantitative ratio of 2:1.

[0014] Preferably, the composite rope core is filled with lubricating grease.

[0015] Preferably, the sub-outer layer of steel wire strands is made of first galvanized steel wire, and the outer layer of steel wire strands is made of second galvanized steel wire, and the diameter of the second galvanized steel wire is 1.2-1.5 times the diameter of the first galvanized steel wire.

[0016] Preferably, an elastic buffer layer is provided on the periphery of the outer steel wire strands, and a wear-resistant protective layer is provided on the periphery of the elastic buffer layer.

[0017] Preferably, the steps for preparing the steel wire rope for elevator with a rope core made of recycled fiber material are:

[0018] S21: preparing the regenerated fiber filament;

[0019] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0020] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0021] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0022] The present invention has the following beneficial effects: the present invention adopts a composite rope core for the inner rope core of the steel wire rope, and the composite rope core includes regenerated fiber filaments, sub-outer layer filaments and outer layer filaments. The regenerated fiber filaments can improve the toughness and tensile resistance of the composite rope core, and the sub-outer layer filaments and outer layer filaments provide better support and oil storage capacity, provide sufficient lubrication and good support for the steel wire strands of the steel wire rope, and can greatly improve the overall comprehensive performance of the steel wire rope. The regenerated fiber filaments are made of modified regenerated high-density polyethylene and carbon fiber, and polyethylene waste is reasonably recycled. By modifying the regenerated high-density polyethylene, the composite effect of high-density polyethylene and carbon fiber is improved. The carbon fiber has higher mechanical, thermal and electrical properties, and has a higher strength / density ratio. The addition of carbon fiber can effectively improve the problem of performance degradation of regenerated high-density polyethylene. The composite of the two can further improve the tensile strength of the regenerated fiber filaments. At the same time, the waste polyethylene material is recycled again, which can not only make full use of it but also protect the environment, and has a promoting effect on sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a structural schematic diagram of a steel wire rope for a rope core elevator made of a regenerated fiber material.

[0024] In the figure: 1-composite rope core, 2-second outer steel wire strands, 3-outer steel wire strands, 4-elastic buffer layer, 5-wear-resistant protective layer, 101-regenerated fiber yarn, 102-sisal yarn, 103-fine galvanized steel wire, 104-lubricating grease. DETAILED DESCRIPTION

[0025] The embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] refer to Figure 1This embodiment provides a steel wire rope for a regenerated fiber material rope core elevator, comprising a composite rope core 1 and steel wire strands arranged on the periphery of the composite rope core 1. The composite rope core 1 comprises regenerated fiber filaments 101, sub-outer layer filaments and outer layer filaments, the sub-outer layer filaments are spirally wrapped around the regenerated fiber filaments 101, and the outer layer filaments are spirally wrapped around the sub-outer layer filaments. The steel wire strands comprise sub-outer layer steel wire strands 2 and outer layer steel wire strands 3, the sub-outer layer steel wire strands 2 are spirally wrapped around the composite rope core 1, and the outer layer steel wire strands 3 are spirally wrapped around the sub-outer layer steel wire strands 2. The regenerated fiber filaments 101 are twisted from a plurality of regenerated fiber filaments, the regenerated fiber filaments are made of modified regenerated high-density polyethylene and carbon fiber, and the diameter of the regenerated fiber filaments 101 is 0.4-0.7 times the diameter of the composite rope core 1. The diameter of the regenerated fiber filament 101 includes but is not limited to 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7 times the diameter of the composite rope core 1. Regenerated high-density polyethylene is also called high-density polyethylene recycled material, HDPE recycled material, which is recycled HDPE nozzle material and HDPE products. After being washed and dehydrated, it is crushed and granulated by a granulator. Considering the performance degradation of recycled high-density polyethylene, the present invention makes up for the shortcomings of recycled high-density polyethylene by appropriately adding carbon fiber and utilizing the high strength and toughness of carbon fiber.

[0027] Wherein, the preparation steps of the regenerated fiber filaments are:

[0028] S1: grafting butyl acrylate onto recycled high-density polyethylene to obtain modified recycled high-density polyethylene;

[0029] S2: performing a modification treatment on the carbon fiber, firstly performing a degumming treatment on the carbon fiber to obtain a degummed carbon fiber, and then performing a concentrated nitric acid treatment on the degummed carbon fiber to obtain a modified carbon fiber;

[0030] S3: After drying the modified recycled high-density polyethylene and the modified carbon fiber, mixing them in a predetermined ratio and feeding them into a mixed rheometer for granulation to obtain recycled particles, then vacuum drying the recycled particles, heating and melting them, extruding and spinning to obtain regenerated fiber filaments, performing multi-stage drafting on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber filaments of a predetermined diameter. The modified recycled high-density polyethylene is obtained by grafting the regenerated high-density polyethylene, and the carbon fiber is modified by concentrated nitric acid. The strong oxidizing effect of concentrated nitric acid has oxidized the aromatic rings on the surface of the carbon fiber into oxygen-containing functional groups such as hydroxyl, carboxyl and aldehyde. These groups increase the surface energy of the carbon fiber, which is beneficial for the modified recycled high-density polyethylene to better wet the fiber surface and make the two phases contact more closely. The bonding force between the carbon fiber and the modified recycled high-density polyethylene can be improved, thereby improving the stability of the material.

[0031] The preparation steps of the modified recycled high-density polyethylene in step S1 are: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles.

[0032] The preparation steps of the modified carbon fiber in step S2 are: soaking the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soaking the degummed carbon fiber in concentrated nitric acid, treating it at 100°C for 100 minutes by condensation reflux, and then filtering the degummed carbon fiber treated with concentrated nitric acid, washing it with clean water for more than 10 times, and then drying it at 100°C to obtain the modified carbon fiber.

[0033] In step S3, the addition ratio of the modified recycled high-density polyethylene and the modified carbon fiber is 95:5 or 90:10 or 85:15 or 80:20 or 75:25 or 70:30.

[0034] The secondary outer wire includes sisal wire 102 and fine galvanized steel wire 103 in a quantity ratio of 1:1, and the outer wire includes sisal wire 102 and fine galvanized steel wire 103 in a quantity ratio of 2:1. The secondary outer wire and the outer wire use sisal wire and galvanized steel wire in different quantity ratios, and the quantity ratio of sisal wire and fine galvanized steel wire in the secondary outer wire is 1:1 and is arranged at intervals, which can balance the support force and oil storage of the composite rope core, while the outer wire increases the proportion of sisal wire, improves the oil storage capacity of the outer wire, and can improve the release effect of the composite rope core on the steel wire strand grease, and continuously lubricates the steel wire strand. Good lubrication is very important for elevator wire ropes. Since elevator wire ropes need to continuously rub back and forth, the forces between the steel wire strands in the wire rope are complex and changeable. Only when the lubrication effect between strands is good can the life of the wire rope be better extended.

[0035] The composite rope core 1 is filled with lubricating grease 104 .

[0036] The sub-outer steel wire strand 2 is a first galvanized steel wire, and the outer steel wire strand 3 is a second galvanized steel wire, the diameter of the second galvanized steel wire is 1.2-1.5 times the diameter of the first galvanized steel wire. The diameter of the second galvanized steel wire includes but is not limited to 1.2, 1.3, 1.4, 1.5 times the diameter of the first galvanized steel wire.

[0037] An elastic buffer layer 4 is arranged on the outer periphery of the outer steel wire strand 3, and a wear-resistant protective layer 5 is arranged on the outer periphery of the elastic buffer layer 4. The elastic buffer layer 4 is a polyester fiber mesh layer with a certain thickness, which improves the impact resistance of the elevator wire rope during use. The outermost layer is provided with a wear-resistant protective layer 5, which is a rubber protective layer, which can improve the wear resistance of the wire rope. At the same time, the elastic buffer layer 4 and the wear-resistant protective layer 5 also have the effect of maintaining the stability of the internal structure of the wire rope.

[0038] The preparation steps of the regenerated fiber material rope core elevator steel wire rope are as follows:

[0039] S21: preparing the regenerated fiber filament;

[0040] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0041] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0042] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0043] Example 1

[0044] This embodiment provides a steel wire rope for an elevator with a rope core made of a recycled fiber material, and the preparation steps are as follows:

[0045] S21: preparing the regenerated fiber filaments, performing butyl acrylate grafting treatment on regenerated high-density polyethylene to obtain modified regenerated high-density polyethylene; performing modification treatment on carbon fiber to obtain modified carbon fiber; drying the modified regenerated high-density polyethylene and the modified carbon fiber, mixing them in a volume ratio of 80:20, and feeding them into a mixing rheometer for granulation to obtain regenerated particles, and then vacuum drying the regenerated particles, heating and melting them, extruding and drawing to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber filaments of a predetermined diameter, wherein the diameter of the regenerated fiber filaments is designed to be 0.5 times the diameter of the composite rope core;

[0046] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0047] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0048] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0049] The preparation steps of the modified recycled high-density polyethylene are as follows: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles. The recycled high-density polyethylene is purchased from Hunan Wuqiang Industry Group Co., Ltd., and the melt index (MFR) is 1.1 g / 10 min.

[0050] The preparation steps of the modified carbon fiber are as follows: soak the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soak the degummed carbon fiber in concentrated nitric acid, treat it at 100°C for 100 minutes by condensation reflux, then filter out the degummed carbon fiber treated with concentrated nitric acid, wash it with clean water for more than 10 times, and then dry it at 100°C to obtain the modified carbon fiber.

[0051] Example 2

[0052] This embodiment provides a steel wire rope for an elevator with a rope core made of a recycled fiber material, and the preparation steps are as follows:

[0053] S21: preparing the regenerated fiber filaments, grafting butyl acrylate on regenerated high-density polyethylene to obtain modified regenerated high-density polyethylene; modifying carbon fiber to obtain modified carbon fiber; drying the modified regenerated high-density polyethylene and the modified carbon fiber, mixing them in a volume ratio of 95:5, and feeding them into a mixing rheometer for granulation to obtain regenerated particles, and then vacuum drying the regenerated particles, heating and melting them, extruding and spinning to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber filaments of a predetermined diameter, wherein the diameter of the regenerated fiber filaments is designed to be 0.5 times the diameter of the composite rope core;

[0054] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0055] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0056] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0057] The preparation steps of the modified recycled high-density polyethylene are as follows: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles. The recycled high-density polyethylene is purchased from Hunan Wuqiang Industry Group Co., Ltd., and the melt index (MFR) is 1.1 g / 10 min.

[0058] The preparation steps of the modified carbon fiber are as follows: soak the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soak the degummed carbon fiber in concentrated nitric acid, treat it at 100°C for 100 minutes by condensation reflux, then filter out the degummed carbon fiber treated with concentrated nitric acid, wash it with clean water for more than 10 times, and then dry it at 100°C to obtain the modified carbon fiber.

[0059] Example 3

[0060] This embodiment provides a steel wire rope for an elevator with a rope core made of a recycled fiber material, and the preparation steps are as follows:

[0061] S21: preparing the regenerated fiber filaments, performing butyl acrylate grafting treatment on regenerated high-density polyethylene to obtain modified regenerated high-density polyethylene; performing modification treatment on carbon fiber to obtain modified carbon fiber; drying the modified regenerated high-density polyethylene and the modified carbon fiber, mixing them in a volume ratio of 70:30, and feeding them into a mixing rheometer for granulation to obtain regenerated particles, and then vacuum drying the regenerated particles, heating and melting them, extruding and drawing to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber filaments of a predetermined diameter, wherein the diameter of the regenerated fiber filaments is designed to be 0.5 times the diameter of the composite rope core;

[0062] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0063] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0064] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0065] The preparation steps of the modified recycled high-density polyethylene are as follows: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles. The recycled high-density polyethylene is purchased from Hunan Wuqiang Industry Group Co., Ltd., and the melt index (MFR) is 1.1 g / 10 min.

[0066] The preparation steps of the modified carbon fiber are as follows: soak the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soak the degummed carbon fiber in concentrated nitric acid, treat it at 100°C for 100 minutes by condensation reflux, then filter out the degummed carbon fiber treated with concentrated nitric acid, wash it with clean water for more than 10 times, and then dry it at 100°C to obtain the modified carbon fiber.

[0067] Example 4

[0068] This embodiment provides a steel wire rope for an elevator with a rope core made of a recycled fiber material, and the preparation steps are as follows:

[0069] S21: preparing the regenerated fiber filaments, grafting butyl acrylate on regenerated high-density polyethylene to obtain modified regenerated high-density polyethylene; modifying carbon fiber to obtain modified carbon fiber; drying the modified regenerated high-density polyethylene and the modified carbon fiber, mixing them in a volume ratio of 65:35, and feeding them into a mixing rheometer for granulation to obtain regenerated particles, and then vacuum drying the regenerated particles, heating and melting them, extruding and spinning to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber filaments of a predetermined diameter, wherein the diameter of the regenerated fiber filaments is designed to be 0.5 times the diameter of the composite rope core;

[0070] S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core;

[0071] S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes;

[0072] S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

[0073] The preparation steps of the modified recycled high-density polyethylene are as follows: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles. The recycled high-density polyethylene is purchased from Hunan Wuqiang Industry Group Co., Ltd., and the melt index (MFR) is 1.1 g / 10 min.

[0074] The preparation steps of the modified carbon fiber are as follows: soak the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soak the degummed carbon fiber in concentrated nitric acid, treat it at 100°C for 100 minutes by condensation reflux, then filter out the degummed carbon fiber treated with concentrated nitric acid, wash it with clean water for more than 10 times, and then dry it at 100°C to obtain the modified carbon fiber.

[0075] Comparative Example 1

[0076] This comparative example provides a steel wire rope for an elevator. Compared with the steel wire rope for an elevator with a regenerated fiber material core provided in Example 1, the difference is that the composite rope core includes high-density polyethylene fiber filaments, sub-outer layer filaments and outer layer filaments, the sub-outer layer filaments are spirally wrapped around the high-density polyethylene fiber filaments, and the outer layer filaments are spirally wrapped around the sub-outer layer filaments. The preparation steps thereof are different from those provided in Example 1 in that the regenerated fiber filaments are replaced with high-density polyethylene fiber filaments, and then the high-density polyethylene particles are vacuum dried, heated, melted, extruded and drawn to obtain high-density polyethylene fiber filaments, the high-density polyethylene fiber filaments are subjected to multi-stage drafting, and then hot stretching, and then a number of high-density polyethylene fiber filaments are twisted to obtain high-density polyethylene fiber filaments of a predetermined diameter, and the diameter of the high-density polyethylene fiber filaments is designed to be 0.5 times the diameter of the composite rope core. The preparation methods of the sub-outer layer filaments, outer layer filaments, sub-outer layer steel wire strands, outer layer steel wire strands, elastic buffer layer and wear-resistant protective layer refer to Example 1.

[0077] Comparative Example 2

[0078] This comparative example provides a steel wire rope for an elevator. Compared with the steel wire rope for an elevator with a rope core made of a recycled fiber material provided in Example 1, the difference between the steel wire rope for an elevator and the steel wire rope for an elevator is that in step S21, the operation of grafting butyl acrylate on the recycled high-density polyethylene to obtain modified recycled high-density polyethylene is omitted.

[0079] Comparative Example 3

[0080] This comparative example provides a steel wire rope for an elevator. Compared with the steel wire rope for an elevator with a regenerated fiber core provided in Example 1, the difference between the steel wire rope for an elevator and the steel wire rope for an elevator is that the operation of modifying the carbon fiber to obtain modified carbon fiber is omitted in step S21.

[0081] The steel wire ropes prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests in accordance with the provisions of GB / T8903-2018 "Steel Wire Ropes for Elevators". The bending fatigue test was performed by observing the number of broken wires after bending 600,000 times. The test results are shown in Table 1 below.

[0082] Table 1

[0083] Breaking force / KN Elastic elongation / % Structural elongation / % Bending fatigue wire / root breakage Example 1 53.1 0.10 0.05 0 Example 2 48.2 0.11 0.05 0 Example 3 50.9 0.11 0.07 0 Example 4 43.5 0.12 0.06 0 Comparative Example 1 51.2 0.11 0.07 0 Comparative Example 2 40.3 0.16 0.07 3 Comparative Example 3 41,6 0.15 0.08 2

[0084] From the above data, it can be seen that the regenerated fiber filaments made of recycled high-density polyethylene proposed in the present invention can replace the high-density polyethylene filaments prepared from normal high-density polyethylene, and also have a promoting effect on the strength and structural stability of the steel wire rope. And the rope core is mainly made of synthetic fibers and natural fibers, which have good flexibility and oil storage, and provide sufficient lubrication for the internal structure of the steel wire rope. And the steel wire rope provided by the present invention has no broken wires after 600,000 bends, and has better stability and safety in elevator applications. It can be seen from the data in Example 1 and Example 2 that when the proportion of modified carbon fiber increases, it has a promoting effect on improving the strength of the steel wire rope, but as the proportion of carbon fiber continues to increase, especially when its proportion exceeds a certain range, it will reduce the performance of the steel wire rope.

[0085] The present invention is described in detail above in conjunction with the embodiments. It should be noted that the various specific technical features described in the above specific embodiments can be combined and changed in any suitable manner without contradiction, and the present invention will not further describe various possible combinations. In addition, other variations and combinations of the various technical features of the present invention should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A steel wire rope for an elevator with a regenerated fiber core, comprising a composite core and steel strands arranged on the periphery of the composite core, characterized in that: The composite rope core includes regenerated fiber filaments, sub-outer layer filaments and outer layer filaments, the sub-outer layer filaments are spirally wrapped around the regenerated fiber filaments, and the outer layer filaments are spirally wrapped around the sub-outer layer filaments; the steel wire strands include sub-outer layer steel wire strands and outer layer steel wire strands, the sub-outer layer steel wire strands are spirally wrapped around the composite rope core, and the outer layer steel wire strands are spirally wrapped around the sub-outer layer steel wire strands; the regenerated fiber filaments are twisted from a number of regenerated fiber filaments, the regenerated fiber filaments are made of modified regenerated high-density polyethylene and carbon fiber, and the diameter of the regenerated fiber filaments is 0.4-0.7 times the diameter of the composite rope core.

2. The steel wire rope for elevator with a regenerated fiber core according to claim 1, characterized in that: The preparation steps of the regenerated fiber filaments are as follows: S1: grafting butyl acrylate onto recycled high-density polyethylene to obtain modified recycled high-density polyethylene; S2: performing a modification treatment on the carbon fiber, firstly performing a degumming treatment on the carbon fiber to obtain a degummed carbon fiber, and then performing a concentrated nitric acid treatment on the degummed carbon fiber to obtain a modified carbon fiber; S3: drying the modified recycled high-density polyethylene and the modified carbon fiber, mixing them in a predetermined ratio, feeding them into a mixing rheometer for granulation to obtain regenerated particles, then vacuum drying the regenerated particles, heating and melting them, extruding and drawing them to obtain regenerated fiber filaments, performing multi-stage drawing on the regenerated fiber filaments, and then performing heat stretching, and then twisting a number of regenerated fiber filaments to obtain regenerated fiber yarns of a predetermined diameter.

3. The steel wire rope for elevator with a regenerated fiber core according to claim 2, characterized in that: The preparation steps of the modified recycled high-density polyethylene in step S1 are: the recycled high-density polyethylene, butyl acrylate and diisopropylbenzene peroxide are uniformly mixed in a ratio of 10:1:0.1, added to a twin-screw extruder, the temperature is 220°C, the material stays in the extruder for 5 minutes, and extrusion granulation is performed to obtain modified recycled high-density polyethylene particles.

4. The steel wire rope for elevator with a regenerated fiber core according to claim 2, characterized in that: The preparation steps of the modified carbon fiber in step S2 are: soaking the carbon fiber in acetone for 24 hours to remove the organic colloid on the surface to obtain the degummed carbon fiber; soaking the degummed carbon fiber in concentrated nitric acid, treating it at 100°C for 100 minutes by condensation reflux, and then filtering the degummed carbon fiber treated with concentrated nitric acid, washing it with clean water for more than 10 times, and then drying it at 100°C to obtain the modified carbon fiber.

5. The steel wire rope for elevator with a regenerated fiber core according to claim 2, characterized in that: In step S3, the added volume ratio of the modified recycled high-density polyethylene and the modified carbon fiber is 95:5 or 90:10 or 85:15 or 80:20 or 75:25 or 70:

30.

6. The steel wire rope for elevator with a regenerated fiber core according to claim 1, characterized in that: The secondary outer layer wires include sisal wires and fine galvanized steel wires in a quantity ratio of 1:1, and the outer layer wires include sisal wires and fine galvanized steel wires in a quantity ratio of 2:

1.

7. The steel wire rope for elevators with a regenerated fiber core according to claim 1, characterized in that: The composite rope core is filled with lubricating grease.

8. The steel wire rope for elevators with a regenerated fiber core according to claim 1, characterized in that: The sub-outer layer steel wire strands are made of first galvanized steel wires, and the outer layer steel wire strands are made of second galvanized steel wires, wherein the diameter of the second galvanized steel wire is 1.2-1.5 times the diameter of the first galvanized steel wire.

9. The steel wire rope for elevators with a regenerated fiber core according to claim 8, characterized in that: An elastic buffer layer is arranged on the periphery of the outer steel wire strand, and a wear-resistant protective layer is arranged on the periphery of the elastic buffer layer.

10. The steel wire rope for elevators with a recycled fiber core according to claim 9, characterized in that: The preparation steps of the regenerated fiber material rope core elevator steel wire rope are as follows: S21: preparing the regenerated fiber filament; S22: Take sisal yarn and fine galvanized steel wire in a quantity ratio of 1:1, arrange the sisal yarn and fine galvanized steel wire alternately, and spirally twist and cover them on the periphery of the regenerated fiber yarn to obtain a secondary outer layer of yarn, and then soak them in oil for 10 minutes; then take sisal yarn and fine galvanized steel wire in a quantity ratio of 2:1, arrange them in a manner of two sisal yarns and one fine galvanized steel wire, and spirally twist and cover them on the periphery of the secondary outer layer of yarn to obtain an outer layer of yarn, and then soak them in oil for 10 minutes to obtain a composite rope core; S23: taking a galvanized steel wire with a smaller diameter and twisting it spirally around the composite rope core to obtain a secondary outer layer of steel wire strands, twisting and closing the strands while pouring oil, then taking a galvanized steel wire with a larger diameter and twisting it spirally around the secondary outer layer of steel wire strands to obtain an outer layer of steel wire strands, twisting and closing the strands while pouring oil, then compacting the strands with a machine and then immersing them in oil for 2 minutes; S24: Wrapping the outer circumference of the outer steel wire strands with several layers of polyester fiber mesh cloth and hot pressing and fixing them to obtain the elastic buffer layer, and wrapping the elastic buffer layer with a wear-resistant rubber sleeve to obtain a wear-resistant protective layer, thereby obtaining the steel wire rope for the regenerated fiber material rope core elevator.

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