High-strength mute high-speed elevator steel wire rope

Abstract

The invention provides a high-strength mute high-speed elevator steel wire rope which comprises a composite rope core, an inner layer strand and an outer layer strand, the inner layer strand and the outer layer strand are arranged on the periphery of the composite rope core, the outer layer strand is arranged on the periphery of the inner layer strand, a sound absorption layer is arranged on the periphery of the outer layer strand and comprises n sound absorption units, n is a positive integer larger than 1, and n is a positive integer larger than 1. The sound absorption unit comprises a polyacrylonitrile nanofiber layer, a polystyrene nanofiber layer and a carbon fiber grid layer, the polyacrylonitrile nanofiber layer is arranged on one side of the polystyrene nanofiber layer, and the carbon fiber grid layer is arranged on the other side of the polystyrene nanofiber layer. The sound absorption layer is arranged outside the steel wire rope, the sound absorption layer is composed of the multiple sound absorption units, the polyacrylonitrile nanofiber layer and the polystyrene nanofiber layer are combined for use, the sound absorption performance of the sound absorption layer can be greatly improved, the mute effect of the steel wire rope is further improved, and noise generated when the steel wire rope is used is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steel wire ropes, and in particular to a high-strength and silent high-speed elevator steel wire rope. Background Art

[0002] Steel wire rope is made by twisting steel wires with specific geometric dimensions and mechanical properties according to certain rules. It has a spiral structure and is generally composed of a rope core, strands and grease. Steel wire rope has the advantages of high strength, light weight, stability and reliability. It is widely used in construction, mining, metallurgy, petroleum, marine transportation, machinery and other fields. It can be used in elevators, aircraft arresting cables, cranes and other important parts.

[0003] An elevator is a permanent transportation device that serves several specific floors in a building, and its car runs on at least two rows of rigid rails that are perpendicular to the horizontal plane or inclined at an angle of less than 15° to the plumb line. The size and structure of the car are convenient for passengers to enter and exit or load and unload goods. It is customary to use elevators as a general term for vertical transportation tools in buildings regardless of their driving mode. Elevator wire ropes are wire ropes used in elevators. The most commonly used small passenger elevators require fast speeds. During the long-term high-speed operation of the elevator, the elevator wire rope will shake when it is squeezed with the rope groove, and then corresponding noise will be generated, such as a "buzzing" sound, which will reduce the comfort of the passengers' experience. In addition, the elevator wire rope also needs to have excellent strength and stability, which is of great significance to improving the safety of the elevator. In this regard, a high-strength and silent high-speed elevator wire rope is proposed to improve the safety of elevator operation while reducing noise, so that people can use the elevator better. Summary of the invention

[0004] The object of the present invention is to provide a high-strength and silent high-speed elevator steel wire rope to solve the above-mentioned technical problems.

[0005] The present invention provides a high-strength and silent high-speed elevator steel wire rope, comprising a composite rope core and inner and outer strands arranged on the periphery of the composite rope core, wherein the outer strands are arranged on the periphery of the inner strands. The composite rope core comprises synthetic fiber filaments, natural fiber filaments and thin steel wires, wherein the natural fiber filaments are spirally wrapped around the synthetic fiber filaments, and the thin steel wires are arranged on the periphery of adjacent natural fiber filaments. The inner strands comprise a strand core and an outer strand, wherein the outer strands are spirally wrapped around the strand core. The outer strands comprise one second strand core and six second outer strands, wherein the second outer strands are wrapped around the second strand core and then forged and compacted, wherein the cross section of the outer strands is a hexagonal structure, and the second strand core and the second outer strand are both galvanized steel wires with the same diameter. A sound-absorbing layer is arranged at the periphery of the outer strand, and the sound-absorbing layer includes n sound-absorbing units, where n is a positive integer greater than 1, and the sound-absorbing units include a polyacrylonitrile nanofiber layer, a polystyrene nanofiber layer and a carbon fiber mesh layer, the polyacrylonitrile nanofiber layer is arranged on one side of the polystyrene nanofiber layer, and the carbon fiber mesh layer is arranged on the other side of the polystyrene nanofiber layer.

[0006] Preferably, the polyacrylonitrile nanofiber layer is formed by stacking a layers of polyacrylonitrile nanofiber membranes, a is a natural number of 3-8, the polystyrene nanofiber layer is formed by stacking b layers of polystyrene nanofiber membranes, b is a natural number of 2-6, and the carbon fiber mesh layer is formed by stacking 2 layers of carbon fiber unidirectional cloth, and the carbon fiber directions of the upper and lower layers of carbon fiber unidirectional cloth are set at 90°.

[0007] Preferably, the preparation method of the polyacrylonitrile nanofiber membrane is as follows: S1: Weigh an appropriate amount of polyacrylonitrile powder and SiO2 particles with a particle size of 500nm, place them in a container and mix them thoroughly, then weigh a DMF solution and add it to the container, seal it, heat and stir it, and ultrasonically treat it to obtain a polyacrylonitrile spinning solution, in which the polyacrylonitrile accounts for 12wt%, the SiO2 particles account for 7wt%, and the remainder is DMF solution; S2: Electrospin the polyacrylonitrile spinning solution to obtain a polyacrylonitrile nanofiber membrane.

[0008] Preferably, the preparation method of the polystyrene nanofiber membrane is as follows: S21: weigh a predetermined amount of polystyrene particles and a predetermined amount of tetrahydrofuran and N,N-dimethylformamide solvent, add them into a container, seal it, and stir at room temperature for 6 hours to obtain a polystyrene spinning solution, wherein the polystyrene accounts for 25wt% of the polystyrene in the polystyrene spinning solution, and the mass ratio of tetrahydrofuran and N,N-dimethylformamide solvent is 1:3; S22: electrospin the polystyrene spinning solution to obtain a polystyrene nanofiber membrane.

[0009] Preferably, the synthetic fiber filaments in the composite rope core are polyester fiber filaments, and the natural fiber filaments are sisal fiber.

[0010] Preferably, the core strand is a second sisal wire, the outer wire is a second galvanized steel wire, and the diameter of the second galvanized steel wire is smaller than that of the galvanized steel wire.

[0011] Preferably, a steel wire mesh reinforcement layer is provided on the outer periphery of the composite rope core, and the outer periphery of the steel wire rope mesh reinforcement layer is in contact with the inner layer strands.

[0012] Preferably, a buffer layer and a wear-resistant layer are sequentially provided outside the sound-absorbing layer, the buffer layer is provided between the sound-absorbing layer and the wear-resistant layer, the buffer layer is a polyester fiber layer, and the wear-resistant layer is a rubber layer.

[0013] Preferably, the preparation method of the high-strength and silent high-speed elevator steel wire rope is:

[0014] Step 1, preparing a composite rope core: taking polyester fiber yarn, sisal yarn and thin steel wire and twisting them into a rope core of a certain diameter by a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core;

[0015] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, and applying oil while closing them to obtain the inner strand;

[0016] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands;

[0017] Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0018] Preferably, the preparation method of the sound-absorbing layer is as follows: S31: prepare a polyacrylonitrile nanofiber membrane, and then stack and fix a predetermined number of polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer; S32: prepare a polystyrene nanofiber membrane, and then stack and fix a predetermined number of polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer; S33: take two layers of carbon fiber unidirectional cloth, stack and fix them to obtain a carbon fiber mesh layer; S34: stack the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound-absorbing unit; S35: stack and fix a plurality of sound-absorbing units to obtain the sound-absorbing layer.

[0019] The present invention has the following beneficial effects: The present invention provides a high-strength and silent high-speed elevator steel wire rope, by providing a sound-absorbing layer on the outside of the steel wire rope, the sound-absorbing layer is composed of a plurality of sound-absorbing units, each sound-absorbing unit is provided with a polyacrylonitrile nanofiber layer, a polystyrene nanofiber layer and a carbon fiber mesh layer in sequence, the polyacrylonitrile nanofiber layer has good low-frequency sound absorption performance, the polystyrene nanofiber layer has good high-frequency sound absorption performance, and the combination of the two can greatly improve the sound absorption performance of the sound-absorbing layer, so that the silent effect of the steel wire rope is further improved, and the noise when the steel wire rope is used is reduced; further, the sound-absorbing unit is also provided with a carbon fiber mesh layer, which can improve the strength of the sound-absorbing layer, better match the elevator steel wire rope working conditions, and have an auxiliary effect on improving the tensile resistance of the steel wire rope. The steel wire rope proposed by the present invention adopts a composite rope core, and the composite rope core adopts a combination of synthetic fiber filaments and natural fiber filaments, which can improve the toughness and tensile resistance of the composite rope core, and can provide better support with fine steel wire and steel mesh reinforcement layer, laying a foundation for the running stability of the steel wire rope. An inner layer and an outer layer are arranged on the outside of the composite rope core. The two-layer arrangement can greatly improve the tensile strength of the wire rope. The structural arrangement of the outer layer enables the wire rope to be twisted tightly, so that the performance of the wire rope is more excellent and can adapt to the high-speed operation of the elevator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic structural diagram of a high-strength and silent high-speed elevator steel wire rope.

[0021] Figure 2 It is a schematic structural diagram of the sound absorbing layer of the present invention.

[0022] In the figure: 1-synthetic fiber filaments, 2-natural fiber filaments, 3-fine steel wires, 4-steel mesh reinforcement layer, 5-core strands, 6-outer layer filaments, 7-second core strands, 8-second outer layer filaments, 9-sound absorbing layer, 10-buffer layer, 11-wear-resistant layer, 901-polyacrylonitrile nanofiber layer, 902-polystyrene nanofiber layer, 903-carbon fiber mesh layer. DETAILED DESCRIPTION

[0023] 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.

[0024] refer to Figure 1 and Figure 2This embodiment provides a high-strength and silent high-speed elevator steel wire rope, comprising a composite rope core and inner and outer strands arranged on the periphery of the composite rope core, wherein the outer strands are arranged on the periphery of the inner strands. The composite rope core comprises synthetic fiber filaments 1, natural fiber filaments 2 and thin steel wires 3, wherein the natural fiber filaments 2 are spirally wrapped around the synthetic fiber filaments 1, and the thin steel wires 3 are arranged on the periphery of the adjacent natural fiber filaments 2. The inner strands comprise a strand core 5 and an outer layer wire 6, wherein the outer layer wire 6 is spirally wrapped around the strand core 5. The outer strands comprise a second strand core 75 and six second outer layer wires 86, wherein the second outer layer wires 86 are wrapped around the second strand core 75 and then forged and compacted, wherein the cross section of the outer strands is a hexagonal structure, wherein the second strand core 75 and the second outer layer wires 86 are both galvanized steel wires of the same diameter. A sound absorbing layer 9 is arranged on the periphery of the outer strands, wherein the sound absorbing layer 9 comprises n sound absorbing units, wherein n is a positive integer greater than 1. Preferred n includes but is not limited to 2, 3, 4 or 5. The sound absorbing unit includes a polyacrylonitrile nanofiber layer 901, a polystyrene nanofiber layer 902 and a carbon fiber mesh layer 903, wherein the polyacrylonitrile nanofiber layer 901 is arranged on one side of the polystyrene nanofiber layer 902, and the carbon fiber mesh layer 903 is arranged on the other side of the polystyrene nanofiber layer 902.

[0025] The polyacrylonitrile nanofiber layer 901 is formed by stacking a layers of polyacrylonitrile nanofiber membranes, where a is a natural number of 3-8, and preferably a is 4, 6 or 8. The polystyrene nanofiber layer 902 is formed by stacking b layers of polystyrene nanofiber membranes, where b is a natural number of 2-6, and preferably b is 3 or 5. The carbon fiber mesh layer 903 is formed by stacking two layers of carbon fiber unidirectional cloth, and the carbon fiber directions of the upper and lower layers of carbon fiber unidirectional cloth are arranged at 90°.

[0026] The preparation method of the polyacrylonitrile nanofiber membrane is as follows: S1: weigh an appropriate amount of polyacrylonitrile powder and SiO2 particles with a particle size of 500nm, place them in a container and mix them thoroughly, then weigh a DMF solution and add it to the container, seal it, heat and stir it, and perform ultrasonic treatment to obtain a polyacrylonitrile spinning solution, in which the polyacrylonitrile accounts for 12wt%, the SiO2 particles account for 7wt%, and the balance is DMF solution; S2: electrostatically spin the polyacrylonitrile spinning solution to obtain a polyacrylonitrile nanofiber membrane, and the spinning parameters are a spinning voltage of 18kV, a solution flow rate of 1.5mL / h, an ambient temperature of 25±5℃, and an ambient humidity of 65±5%. The addition of SiO2 particles can make the average pore size of the polyacrylonitrile nanofiber membrane reach 0.48μm, and medium and low frequency long waves can more easily enter the interior of the material, the contact area with the material becomes larger, and the acoustic energy loss increases, so the polyacrylonitrile nanofiber membrane has good attraction performance at medium and low frequencies.

[0027] The preparation method of the polystyrene nanofiber membrane is as follows: S21: weigh a predetermined amount of polystyrene particles and a predetermined amount of tetrahydrofuran and N, N-dimethylformamide solvents and add them into a container, seal it and stir it at room temperature for 6 hours to obtain a polystyrene spinning solution, in which polystyrene accounts for 25wt%, and the mass ratio of tetrahydrofuran and N, N-dimethylformamide solvent is 1:3; S22: electrostatically spin the polystyrene spinning solution to obtain a polystyrene nanofiber membrane, and the spinning parameters are spinning voltage 18kV, solution flow rate 1.5mL / h, ambient temperature 25±5℃, and ambient humidity 65±5%. The fiber surface of the polystyrene nanofiber membrane is a wrinkled structure, the roughness of the fiber surface has changed, the contact area between the sound wave and the fiber increases when the sound wave propagates inside the material, and the sound energy is consumed under the friction, and at this time, the polystyrene nanofiber membrane has good high-frequency sound absorption performance.

[0028] The synthetic fiber yarn 1 in the composite rope core is polyester fiber yarn, and the natural fiber yarn 2 is sisal yarn.

[0029] The core strand 5 is a second sisal wire, and the outer wire 6 is a second galvanized steel wire, and the diameter of the second galvanized steel wire is smaller than that of the galvanized steel wire.

[0030] A steel wire mesh reinforcement layer 4 is arranged on the outer periphery of the composite rope core, and the outer periphery of the steel wire rope mesh reinforcement layer is in contact with the inner layer strands.

[0031] A buffer layer 10 and a wear-resistant layer 11 are sequentially arranged outside the sound-absorbing layer 9 . The buffer layer 10 is arranged between the sound-absorbing layer 9 and the wear-resistant layer 11 . The buffer layer 10 is a polyester fiber layer, and the wear-resistant layer 11 is a rubber layer.

[0032] The inside of the composite rope core and between the inner strands and the outer strands are filled with lubricating grease.

[0033] The preparation method of the high-strength and silent high-speed elevator steel wire rope is as follows:

[0034] Step 1, preparing a composite rope core: taking polyester fiber yarn, sisal yarn and thin steel wire 3 and twisting them into a rope core of a certain diameter by a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core;

[0035] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, and applying oil while closing them to obtain the inner strand;

[0036] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands;

[0037] Step 4, prepare the steel wire rope: use a stranding machine to twist a number of inner strands to cover the composite rope core, then twist a number of outer strands to cover the inner strands, after twisting, immerse in oil to obtain the steel wire rope body, and sequentially coat the outer periphery of the steel wire rope body with a sound-absorbing layer 9, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0038] The preparation method of the sound-absorbing layer 9 is as follows: S31: prepare a polyacrylonitrile nanofiber membrane, and then stack and fix a predetermined number of polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer 901; S32: prepare a polystyrene nanofiber membrane, and then stack and fix a predetermined number of polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer 902; S33: take two layers of carbon fiber unidirectional cloth, stack and fix them to obtain a carbon fiber mesh layer 903; S34: stack the polyacrylonitrile nanofiber layer 901, the polystyrene nanofiber layer 902 and the carbon fiber mesh layer 903 in sequence to obtain a sound-absorbing unit; S35: stack and fix a plurality of sound-absorbing units to obtain the sound-absorbing layer 9.

[0039] Example 1

[0040] This embodiment provides a high-strength and silent high-speed elevator steel wire rope, and the preparation steps are as follows:

[0041] Step 1, preparing a composite rope core: taking polyester fiber filaments, sisal filaments and thin steel wires and twisting them into a rope core of a certain diameter using a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core, wherein the diameter of the polyester fiber filaments is 1.5 times the diameter of the sisal filaments, and the diameter of the thin steel wires is 0.25 times the diameter of the sisal filaments;

[0042] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them to obtain the inner strand, wherein the second sisal yarn and the second galvanized steel wire have the same diameter;

[0043] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands, wherein the diameter of the galvanized steel wire is twice the diameter of the second galvanized steel wire;

[0044] Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0045] The preparation method of the sound absorbing layer is as follows:

[0046] 1) preparing a polyacrylonitrile nanofiber membrane, and then stacking and fixing four polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer;

[0047] 2) preparing a polystyrene nanofiber membrane, and then stacking and fixing three polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer;

[0048] 3) stacking two layers of carbon fiber unidirectional cloth to obtain a carbon fiber mesh layer;

[0049] 4) stacking the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound absorbing unit;

[0050] 5) The two sound absorbing units are stacked and fixed to obtain the sound absorbing layer.

[0051] The preparation method of the polyacrylonitrile nanofiber membrane is as follows: 12kg of polyacrylonitrile powder and 7kg of SiO2 particles with a particle size of 500nm are weighed and placed in a container to be fully mixed, then 81kg of DMF solution is weighed and added to the container, and then sealed and heated and stirred, and ultrasonic treatment is performed to obtain a polyacrylonitrile spinning solution, in which the polyacrylonitrile accounts for 12wt%, the SiO2 particles account for 7wt%, and the remainder is DMF solution (the amount of polyacrylonitrile powder, SiO2 particles and DMF solution added can be proportionally enlarged or reduced according to actual production needs). The polyacrylonitrile spinning solution is electrostatically spun to obtain a polyacrylonitrile nanofiber membrane, and the spinning parameters are a spinning voltage of 18kV, a solution flow rate of 1.5mL / h, an ambient temperature of 25±5°C, and an ambient humidity of 65±5%.

[0052] The preparation method of the polystyrene nanofiber membrane is as follows: 25 kg of polystyrene particles and 75 kg of tetrahydrofuran and N, N-dimethylformamide solvent are weighed and added into a container, the mass ratio of tetrahydrofuran and N, N-dimethylformamide solvent is 1:3, and after sealing, the solution is stirred at room temperature for 6 hours to obtain a polystyrene spinning solution, in which polystyrene accounts for 25 wt% (the amount of polystyrene and tetrahydrofuran, N, N-dimethylformamide solvent added can be proportionally increased or decreased according to actual production needs); the polystyrene spinning solution is electrostatically spun to obtain a polystyrene nanofiber membrane, and the spinning parameters are a spinning voltage of 18 kV, a solution flow rate of 1.5 mL / h, an ambient temperature of 25±5°C, and an ambient humidity of 65±5%.

[0053] Example 2

[0054] This embodiment provides a high-strength and silent high-speed elevator steel wire rope, and the preparation steps are as follows:

[0055] Step 1, preparing a composite rope core: taking polyester fiber filaments, sisal filaments and thin steel wires and twisting them into a rope core of a certain diameter using a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core, wherein the diameter of the polyester fiber filaments is 1.5 times the diameter of the sisal filaments, and the diameter of the thin steel wires is 0.25 times the diameter of the sisal filaments;

[0056] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them to obtain the inner strand, wherein the second sisal yarn and the second galvanized steel wire have the same diameter;

[0057] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands, wherein the diameter of the galvanized steel wire is twice the diameter of the second galvanized steel wire;

[0058] Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0059] The preparation method of the sound absorbing layer is as follows:

[0060] 1) preparing a polyacrylonitrile nanofiber membrane, and then stacking and fixing four polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer;

[0061] 2) preparing a polystyrene nanofiber membrane, and then stacking and fixing three polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer;

[0062] 3) stacking two layers of carbon fiber unidirectional cloth to obtain a carbon fiber mesh layer;

[0063] 4) stacking the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound absorbing unit;

[0064] 5) The three sound absorbing units are stacked and fixed to obtain the sound absorbing layer.

[0065] The preparation method of the polyacrylonitrile nanofiber membrane and the preparation method of the polystyrene nanofiber membrane can be referred to Example 1.

[0066] Example 3

[0067] This embodiment provides a high-strength and silent high-speed elevator steel wire rope, and the preparation steps are as follows:

[0068] Step 1, preparing a composite rope core: taking polyester fiber filaments, sisal filaments and thin steel wires and twisting them into a rope core of a certain diameter using a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core, wherein the diameter of the polyester fiber filaments is 1.5 times the diameter of the sisal filaments, and the diameter of the thin steel wires is 0.25 times the diameter of the sisal filaments;

[0069] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them to obtain the inner strand, wherein the second sisal yarn and the second galvanized steel wire have the same diameter;

[0070] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands, wherein the diameter of the galvanized steel wire is twice the diameter of the second galvanized steel wire;

[0071] Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0072] The preparation method of the sound absorbing layer is as follows:

[0073] 1) preparing a polyacrylonitrile nanofiber membrane, and then stacking and fixing four polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer;

[0074] 2) preparing a polystyrene nanofiber membrane, and then stacking and fixing three polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer;

[0075] 3) stacking two layers of carbon fiber unidirectional cloth to obtain a carbon fiber mesh layer;

[0076] 4) stacking the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound absorbing unit;

[0077] 5) Four sound absorbing units are stacked and fixed to obtain the sound absorbing layer.

[0078] The preparation method of the polyacrylonitrile nanofiber membrane and the preparation method of the polystyrene nanofiber membrane can be referred to Example 1.

[0079] Example 4

[0080] This embodiment provides a high-strength and silent high-speed elevator steel wire rope, and the preparation steps are as follows:

[0081] Step 1, preparing a composite rope core: taking polyester fiber filaments, sisal filaments and thin steel wires and twisting them into a rope core of a certain diameter using a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core, wherein the diameter of the polyester fiber filaments is 1.5 times the diameter of the sisal filaments, and the diameter of the thin steel wires is 0.25 times the diameter of the sisal filaments;

[0082] Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them to obtain the inner strand, wherein the second sisal yarn and the second galvanized steel wire have the same diameter;

[0083] Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands, wherein the diameter of the galvanized steel wire is twice the diameter of the second galvanized steel wire;

[0084] Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

[0085] The preparation method of the sound absorbing layer is as follows:

[0086] 1) preparing a polyacrylonitrile nanofiber membrane, and then stacking and fixing 6 polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer;

[0087] 2) preparing a polystyrene nanofiber membrane, and then stacking and fixing five polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer;

[0088] 3) stacking two layers of carbon fiber unidirectional cloth to obtain a carbon fiber mesh layer;

[0089] 4) stacking the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound absorbing unit;

[0090] 5) The two sound absorbing units are stacked and fixed to obtain the sound absorbing layer.

[0091] Comparative Example 1

[0092] This comparative example provides a steel wire rope for an elevator. Compared with the high-strength and silent high-speed elevator steel wire rope provided in Example 1, the difference between the steel wire rope for an elevator and the steel wire rope is that a polyester fiber layer and a rubber layer are sequentially arranged on the outer periphery of the outer strands of the steel wire rope for an elevator, and the preparation step also omits the preparation of the sound-absorbing layer.

[0093] The steel wire ropes prepared in Examples 1-4 and Comparative Example 1 were subjected to performance tests in accordance with the provisions of GB / T8903-2018 "Steel Wire Ropes for Elevators". The friction decibels between the steel wire rope and the guide wheel were tested at a hoisting weight of 1000 kg and a running speed of 3 m / s. The test results are shown in Table 1.

[0094] Table 1

[0095] Breaking force / KN Elastic elongation / % Structural elongation / % Friction volume / dB Example 1 62.1 0.12 0.06 37dB Example 2 59.7 0.11 0.05 35dB Example 3 58.6 0.11 0.05 30dB Example 4 60.2 0.12 0.06 35dB Comparative Example 1 57.1 0.13 0.07 50dB

[0096] From the above data, it can be seen that the high-strength and silent high-speed elevator steel wire rope proposed by the present invention has the characteristics of high strength and silence. By adjusting the number of sound-absorbing units in the sound-absorbing layer and adjusting the silent effect of the steel wire rope, the quietness of the elevator operation can be improved, giving people a better sense of use.

[0097] 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 high-strength and silent high-speed elevator steel wire rope, comprising a composite rope core and inner strands and outer strands arranged on the periphery of the composite rope core, wherein the outer strands are arranged on the periphery of the inner strands, and characterized in that: The composite rope core includes synthetic fiber filaments, natural fiber filaments and thin steel wires, the natural fiber filaments are spirally wrapped around the synthetic fiber filaments, and the thin steel wires are arranged on the periphery of adjacent natural fiber filaments; the inner layer strands include a strand core and an outer layer filament, the outer layer filaments are spirally wrapped around the strand core; the outer layer strands include 1 second strand core and 6 second outer layer filaments, the second outer layer filaments are wrapped around the second strand core and then forged and compacted into shape, the cross-section of the outer layer strands is a hexagonal structure, the second strand core and the second outer layer filaments are both galvanized steel wires with the same diameter; a sound-absorbing layer is arranged on the periphery of the outer layer strands, the sound-absorbing layer includes n sound-absorbing units, n is a positive integer greater than 1, the sound-absorbing units include a polyacrylonitrile nanofiber layer, a polystyrene nanofiber layer and a carbon fiber mesh layer, the polyacrylonitrile nanofiber layer is arranged on one side of the polystyrene nanofiber layer, and the carbon fiber mesh layer is arranged on the other side of the polystyrene nanofiber layer.

2. The high-strength and silent high-speed elevator steel wire rope according to claim 1 is characterized in that: The polyacrylonitrile nanofiber layer is formed by stacking a layers of polyacrylonitrile nanofiber membranes, where a is a natural number of 3-8; the polystyrene nanofiber layer is formed by stacking b layers of polystyrene nanofiber membranes, where b is a natural number of 2-6; and the carbon fiber mesh layer is formed by stacking 2 layers of carbon fiber unidirectional cloth, and the carbon fiber directions of the upper and lower layers of carbon fiber unidirectional cloth are set at 90°.

3. The high-strength and silent high-speed elevator steel wire rope according to claim 2 is characterized in that: The preparation method of the polyacrylonitrile nanofiber membrane is as follows: S1: Weigh an appropriate amount of polyacrylonitrile powder and SiO2 particles with a particle size of 500nm, place them in a container and mix them thoroughly, then weigh a DMF solution and add it to the container, seal it, heat and stir it, and ultrasonically treat it to obtain a polyacrylonitrile spinning solution, in which the polyacrylonitrile accounts for 12wt%, the SiO2 particles account for 7wt%, and the rest is DMF solution; S2: Electrospin the polyacrylonitrile spinning solution to obtain a polyacrylonitrile nanofiber membrane.

4. The high-strength and silent high-speed elevator steel wire rope according to claim 3 is characterized in that: The preparation method of the polystyrene nanofiber membrane is as follows: S21: weigh a predetermined amount of polystyrene particles and a predetermined amount of tetrahydrofuran and N,N-dimethylformamide solvent, add them into a container, seal it, and stir at room temperature for 6 hours to obtain a polystyrene spinning solution, wherein the polystyrene accounts for 25wt% of the polystyrene in the polystyrene spinning solution, and the mass ratio of tetrahydrofuran and N,N-dimethylformamide solvent is 1:3; S22: electrostatically spin the polystyrene spinning solution to obtain a polystyrene nanofiber membrane.

5. The high-strength and silent high-speed elevator steel wire rope according to claim 1, characterized in that: The synthetic fiber yarns in the composite rope core are polyester fiber yarns, and the natural fiber yarns are sisal yarns.

6. The high-strength and silent high-speed elevator steel wire rope according to claim 1 is characterized in that: The strand core is a second sisal wire, the outer wire is a second galvanized steel wire, and the diameter of the second galvanized steel wire is smaller than that of the galvanized steel wire.

7. The high-strength and silent high-speed elevator steel wire rope according to claim 6, characterized in that: A steel wire mesh reinforcement layer is arranged at the outer periphery of the composite rope core, and the outer periphery of the steel wire rope mesh reinforcement layer is in contact with the inner layer strands.

8. The high-strength and silent high-speed elevator steel wire rope according to claim 7 is characterized in that: A buffer layer and a wear-resistant layer are sequentially arranged outside the sound-absorbing layer. The buffer layer is arranged between the sound-absorbing layer and the wear-resistant layer. The buffer layer is a polyester fiber layer, and the wear-resistant layer is a rubber layer.

9. The high-strength and silent high-speed elevator steel wire rope according to claim 8, characterized in that: The preparation method of the high-strength and silent high-speed elevator steel wire rope is as follows: Step 1, preparing a composite rope core: taking polyester fiber yarn, sisal yarn and thin steel wire and twisting them into a rope core of a certain diameter by a stranding machine in a predetermined arrangement, and performing oil pouring treatment while closing them, and then coating the outer periphery of the rope core with a steel wire mesh and pressing them into one body, and then immersing them in oil to obtain the composite rope core; Step 2, preparing the inner strand: taking the second sisal yarn and the second galvanized steel wire and twisting them with a stranding machine in a predetermined arrangement, and applying oil while closing them to obtain the inner strand; Step 3, preparing outer strands: taking 7 galvanized steel wires and twisting them with a stranding machine in a predetermined arrangement, closing them together and pouring oil on them, and after twisting, forging them to obtain outer strands; Step 4, preparing the steel wire rope: using a stranding machine to twist a number of inner strands to cover the composite rope core, and then twisting a number of outer strands to cover the inner strands, after twisting, immersing the steel wire rope in oil to obtain a steel wire rope body, and sequentially coating the outer periphery of the steel wire rope body with a sound-absorbing layer, a polyester fiber layer and a rubber layer to obtain the high-strength and silent high-speed elevator steel wire rope.

10. The high-strength and silent high-speed elevator steel wire rope according to claim 9, characterized in that: The preparation method of the sound-absorbing layer is as follows: S31: preparing a polyacrylonitrile nanofiber membrane, and then stacking and fixing a predetermined number of polyacrylonitrile nanofiber membranes to obtain a polyacrylonitrile nanofiber layer; S32: preparing a polystyrene nanofiber membrane, and then stacking and fixing a predetermined number of polystyrene nanofiber membranes to obtain a polystyrene nanofiber layer; S33: taking two layers of carbon fiber unidirectional cloth, stacking and fixing them to obtain a carbon fiber mesh layer; S34: stacking the polyacrylonitrile nanofiber layer, the polystyrene nanofiber layer and the carbon fiber mesh layer in sequence to obtain a sound-absorbing unit; S35: stacking and fixing a plurality of sound-absorbing units to obtain the sound-absorbing layer.

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