High-strength steel wire rope

Abstract

The invention provides a high-strength steel wire rope. The high-strength steel wire rope comprises a steel wire rope body, an externally-attached active regulation and control device and a regulation and control sleeve. The steel wire rope body comprises an outer layer, a middle layer and a core part which are sequentially arranged from outside to inside, the outer layer is a six-strand steel wire bundle with a hexagonal section, the six-strand steel wire bundle is divided into two and three strands which are spirally twisted in a leftward constant-pitch mode to form an alternate close-packed structure, the middle layer is twelve corrugated steel wire strands with a rhombic section, and the core part is arranged between the twelve corrugated steel wire strands. The twelve corrugated steel wire strands are spirally twisted rightwards in a variable-pitch mode, the wave crests and the wave troughs of the twisted adjacent strands are arranged in a staggered and meshed mode to form a continuous contact face, and the core part is a carbon fiber reinforced metal matrix composite core; the active regulation and control device comprises a memory alloy framework layer, a gradient elastic buffer layer and a connecting interface which are sequentially arranged from outside to inside, and the connecting interface is a hexagonal groove array forming geometric interlocking with the six strands of steel wire bundles.

Description

Technical Field

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

[0002] Steel wire rope is like a hemp rope made of steel. Its core is that it is made of multiple strands of steel wire twisted into a rope. The steel wire rope used in modern industry is like a super rope woven with metal wires. It needs to have high strength, flexibility and durability at the same time. The mainstream material of steel wire rope is high carbon steel. After special heat treatment, the tensile strength of this steel can reach 3-4 times that of ordinary steel. In humid or corrosive environments (such as ships and offshore platforms), stainless steel or galvanized steel wire will be used instead.

[0003] The structure of modern wire rope realizes its function through the combination of steel wires at different levels. The more typical structure is 6×19 structure, 6 groups of steel wire bundles, each group consists of 19 steel wires. There is also 8×K36 structure, 8 groups of special-shaped steel wire bundles, each group contains 36 compacted steel wires. It is woven by cross twisting or parallel twisting. The cross twisting method is that the spiral direction of the outer layer of steel wire is opposite to that of the inner layer, similar to the weaving method of traditional hemp rope. The parallel twisting method is that the spiral direction of all layers is the same. This structure is softer but easy to spread.

[0004] Although modern steel wire ropes are already very strong, they still have the following major strength issues in extreme usage scenarios: 1. Stress concentration between steel wires. When two round steel wires squeeze each other, the actual contact area is only the size of a hair's cross-section. The local pressure can reach more than 3 times the average value. When repeatedly bent (such as elevator cables), these contact points will become the starting point of fatigue fracture. 2. Friction between layers consumes energy. When the steel wire rope is subjected to tension, each layer of steel wire will slide slightly, and the resulting friction will generate heat. After long-term use, metal powder will be produced on the surface of the steel wire due to friction, which will accelerate wear.

[0005] Therefore, there is still room for improving the strength of the wire rope structure. Summary of the invention

[0006] The present invention aims to solve the above-mentioned technical problems and provides a high-strength steel wire rope.

[0007] The technical solution of the present invention is a high-strength steel wire rope, comprising a steel wire rope body, an external active control device and a control sleeve;

[0008] The steel wire rope body comprises an outer layer, an intermediate layer, and a core arranged in sequence from the outside to the inside, the outer layer is a six-strand steel wire bundle with a hexagonal cross section, the six-strand steel wire bundle is divided into two or three strands, each of which is twisted in a left-handed constant pitch spiral to form an alternating close-packed structure, the intermediate layer is twelve-strand corrugated steel wire strands with a diamond cross section, the wavelength and wave height ratio of the corrugated steel wire strands is 5:1 to 8:1, the twelve-strand corrugated steel wire strands are twisted in a right-handed variable pitch spiral, and after twisting, the crests and troughs of adjacent strands are arranged in a staggered bite to form a continuous contact surface, and the core is a carbon fiber reinforced metal matrix composite core;

[0009] The active control device comprises a memory alloy skeleton layer, a gradient elastic buffer layer, and a connection interface which are sequentially arranged from the outside to the inside. The memory alloy skeleton layer is sintered by nickel-titanium shape memory alloy and has temperature and stress dual-triggered phase change characteristics. The hardness of the gradient elastic buffer layer gradually decreases from the outer layer to the inner layer. The connection interface is a hexagonal groove array that forms a geometric interlock with the six-strand steel wire bundle. The active control device also comprises a first memory alloy buckle and a second memory alloy buckle respectively arranged at both ends of the memory alloy skeleton layer.

[0010] The regulating sleeve is located below the second memory alloy buckle, and includes six groups of electromagnetic coils corresponding to six steel wire bundles respectively. The regulating sleeve also includes six permanent magnets respectively arranged between two adjacent steel wire bundles, and each of the permanent magnets is connected to a guide plate.

[0011] As an implementation manner, the memory alloy skeleton layer is a nickel-titanium based shape memory alloy.

[0012] As an implementation mode, the gradient elastic buffer layer is made of a composite of silica gel and graphene.

[0013] As an implementation mode, the fiber volume fraction of the carbon fiber reinforced metal matrix composite core is 50% to 60%, the matrix is ​​titanium aluminum alloy, and the axial tensile strength is not less than 1800 MPa.

[0014] As an embodiment, the outer periphery of the carbon fiber reinforced metal matrix composite core is provided with 12 radial convex teeth, the tooth height of the convex teeth is 8% to 10% of the core diameter, and an oil guide groove with an angle of 30° is formed between adjacent convex teeth, and solid lubricating wax is provided in the oil guide groove.

[0015] As an implementation mode, the wavelength of the corrugated steel wire strand is 4.2 mm and the wave height is 0.6 mm.

[0016] As an implementation mode, the wave crest surface of the corrugated steel wire strand is provided with a laser-etched groove, the groove has a depth of 20 to 50 μm and a width of 80 to 120 μm, and the groove is coated with a molybdenum disulfide-nano-diamond composite coating.

[0017] As an implementation mode, equidistant gaps are provided between adjacent steel wire bundles, and the gaps are filled with a polyurethane elastomer, wherein the Shore hardness of the polyurethane elastomer is 50A to 70A.

[0018] As an implementation mode, a rounded corner structure is provided at the corners of the steel wire bundle, and the surface of the rounded corner structure is treated by micro-arc oxidation to form a ceramic layer with a thickness of 10 to 15 μm.

[0019] Compared with the prior art, the beneficial effect of the present invention is that the high-strength steel wire rope constructs an asymmetric stress transfer system. The outer layer adopts a regular hexagonal honeycomb structure, which is composed of six strands of steel wire bundles spiraling in the left direction. Changing the traditional round strands to hexagonal strands can effectively increase the contact area and reduce friction. The interstitial elastomer of the hexagonal steel wire bundle generates lateral support force when under pressure, forming a double stress buffer with the external memory alloy skeleton layer. The middle layer is a diamond-shaped corrugated steel wire strand, which is composed of twelve strands of corrugated steel wire strands with right-hand variable pitch. After the twelve strands of corrugated steel wire strands are twisted, the crests and troughs of adjacent strands are arranged in a staggered bite to form a continuous contact surface. It is through the mechanical interlocking design of the corrugated steel wire strands that the traditional point contact is converted into continuous contact of the wave surface, which can greatly reduce the peak contact stress. The core adopts a strongly supported carbon fiber reinforced metal matrix composite core to avoid deformation caused by insufficient support force of the core, which causes uneven force on each strand. The asymmetric stress transfer system here is reflected in the asymmetry of the spiral direction. Through the torque self-balancing design of the left-handed outer layer and the right-handed middle layer, the axial load transfer efficiency is improved, while the radial expansion force is reduced. It is also reflected in the asymmetric cross-sectional shape. The trapezoidal-corrugated composite cross-section forms a mechanical diode effect, allowing stress to be efficiently transferred in the forward direction, and dissipating energy through corrugated deformation during reverse transmission, achieving directional guidance of stress waves.

[0020] The active control device of the high-strength steel wire rope adopts a hexagonal groove array at its connection interface, which forms a geometric interlock with the hexagonal steel wire bundle on the outer layer of the steel wire rope, and the contact area is greatly increased compared with the plane structure. The first memory alloy buckle and the second memory alloy buckle can provide additional restraint force.

[0021] The stress transfer path optimization of this high-strength steel wire rope is reflected in the multi-level buffering. The corrugated steel wire strands of the wire rope body are the primary buffering, the connecting interface of the hexagonal steel wire bundle gap is the secondary buffering, and the gradient elastic buffer layer is the tertiary buffering.

[0022] The regulating sleeve of the high-strength steel wire rope generates suction force on the six steel wire bundles by energizing the six sets of electromagnetic coils, so that each steel wire bundle is sucked outwards and the gap between each steel wire bundle is increased, thereby helping the metal powder generated by friction to slide down and be adsorbed onto the permanent magnet along the guide plate, thereby reducing the friction loss of the steel wire rope during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a high-strength steel wire rope provided in an embodiment of the present invention;

[0024] Figure 2 A cross-sectional view of a steel wire rope body provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of the active control device and the control sleeve provided in an embodiment of the present invention at a first viewing angle;

[0026] Figure 4 A schematic structural diagram of the active control device and the control sleeve provided in an embodiment of the present invention at a second viewing angle.

[0027] In the figure: 1. Wire rope body; 2. Active control device; 3. Control sleeve; 4. Outer layer; 5. Middle layer; 6. Core; 7. Memory alloy skeleton layer; 8. Gradient elastic buffer layer; 9. Connection interface; 10. First memory alloy buckle; 11. Second memory alloy buckle; 12. Electromagnetic coil; 13. Permanent magnet; 14. Guide plate. DETAILED DESCRIPTION

[0028] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0029] In one embodiment, if Figures 1 to 4 shown.

[0030] The high-strength steel wire rope provided in this embodiment includes a steel wire rope body 1, an external active control device 2 and a control sleeve 3; the steel wire rope body 1 includes an outer layer 4, an intermediate layer 5, and a core 6 arranged in sequence from the outside to the inside, the outer layer 4 is a six-strand steel wire bundle with a hexagonal cross-section, and the six-strand steel wire bundle is divided into two or three strands, each of which is twisted in a left-hand constant pitch spiral to form an alternating close-packed structure, the intermediate layer 5 is twelve corrugated steel wire strands with a diamond cross-section, the wavelength and wave height ratio of the corrugated steel wire strands is 5:1 to 8:1, the twelve corrugated steel wire strands are right-hand variable pitch spirally twisted, and the crests and troughs of adjacent strands after twisting are arranged in a staggered bite to form a continuous contact surface, and the core 6 is a carbon fiber reinforced metal matrix composite core; the active control device 2 includes a memory alloy arranged in sequence from the outside to the inside Skeleton layer 7, gradient elastic buffer layer 8, and connection interface 9, the memory alloy skeleton layer 7 is sintered by nickel-titanium shape memory alloy, and has temperature and stress dual-triggered phase change characteristics, the gradient elastic buffer layer 8 gradually decreases in hardness from the outer layer to the inner layer, and the connection interface 9 is a hexagonal groove array that forms a geometric interlock with the six steel wire bundles. The active control device 2 also includes a first memory alloy buckle 10 and a second memory alloy buckle 11 respectively arranged at both ends of the memory alloy skeleton layer 7, and the control sleeve 3 is located below the second memory alloy buckle 11. The control sleeve 3 includes six groups of electromagnetic coils 12 corresponding to the six steel wire bundles respectively, and the control sleeve 3 also includes six permanent magnets 13 respectively arranged between two adjacent steel wire bundles, and each permanent magnet 13 is connected to a guide plate 14.

[0031] In this embodiment, the high-strength steel wire rope constructs an asymmetric stress transfer system in order to overcome the problems of stress concentration and large friction loss between steel wires.

[0032] The outer layer 4 adopts a regular hexagonal honeycomb structure, which is made of six steel wire bundles with a left-hand spiral (twist pitch 12D) and a 3+3 alternating close twist. Replacing the traditional round strands with hexagonal strands can effectively increase the contact area and reduce friction. The interstitial elastic body of the hexagonal steel wire bundle generates lateral support force when under pressure, forming a double stress buffer with the external memory alloy skeleton layer 7.

[0033] The middle layer 5 is a diamond-shaped corrugated steel wire strand (wavelength 4.2mm, wave height 0.6mm), which is composed of twelve corrugated steel wire strands with right-hand variable pitch (8D-14D gradual change). The so-called diamond shape refers to the cross-section of the corrugated steel wire strand, and the so-called corrugated steel wire strand refers to the steel wire strand being in a corrugated shape with crests and troughs when it is not twisted. Therefore, after the twelve corrugated steel wire strands are twisted, the crests and troughs of adjacent strands are arranged in a staggered bite to form a continuous contact surface. It is through the mechanical interlocking design of the corrugated steel wire strand that the traditional point contact is converted into a continuous contact of the wave surface, which can greatly reduce the peak contact stress. The corrugated steel wire strand with a gradually variable pitch forms a flexible transition zone, which can expand the resonant frequency bandwidth, that is, it helps to reduce the peak contact stress.

[0034] The core 6 adopts a carbon fiber reinforced metal matrix composite core with strong support, so as to avoid deformation caused by insufficient support force of the core 6 and uneven force on each strand.

[0035] The asymmetric stress transfer system here is reflected in the asymmetry of the spiral direction. Through the torque self-balancing design of the left-handed outer layer 4 and the right-handed middle layer 5, the axial load transfer efficiency is improved, while the radial expansion force is reduced. It is also reflected in the asymmetric cross-sectional shape. The trapezoidal (single-strand steel wire bundle cross-section)-corrugated (single-strand corrugated steel wire strand cross-section) forms a mechanical diode effect, allowing stress to be efficiently transferred in the forward direction, and dissipating energy through corrugation deformation during reverse transmission, thereby achieving directional guidance of stress waves. In other words, the contact stress peak can be greatly reduced.

[0036] In this embodiment, the active control device 2 of the high-strength steel wire rope, its connection interface 9 adopts a hexagonal groove array, which forms a geometric interlock with the hexagonal steel wire bundle of the outer layer 4 of the steel wire rope, and the contact area is greatly increased compared with the plane structure. The first memory alloy buckle 10 and the second memory alloy buckle 11, like the memory alloy skeleton layer 7, automatically tighten when the temperature exceeds 45°C or the stress exceeds 20MPa, providing additional restraint. The optimization of the stress transfer path of the high-strength steel wire rope is reflected in the multi-level buffering. The corrugated steel wire strands of the steel wire rope body 1 are the first-level buffering, the connection interface 9 of the hexagonal steel wire bundle gap is the second-level buffering, and the gradient elastic buffer layer 8 is the third-level buffering. The control sleeve 3 of the high-strength steel wire rope generates suction on the six steel wire bundles by supplying power to the six groups of electromagnetic coils 12, so that each steel wire bundle is sucked outward and the gap between each steel wire bundle is increased, thereby helping the metal powder generated by friction to slide down and adsorbed onto the permanent magnet 13 along the guide plate 14. Thereby reducing the friction loss of the steel wire rope in use.

[0037] Therefore, the high-strength steel wire rope overcomes the problems of stress concentration and large friction loss between steel wires.

[0038] In one embodiment, the memory alloy skeleton layer 7 of the high-strength steel wire rope is a nickel-titanium-based shape memory alloy.

[0039] In this embodiment, the nickel-titanium-based shape memory alloy has a temperature / stress dual-triggered phase change characteristic. When the local pressure of the wire rope exceeds the critical value (15-25MPa) or the temperature changes, a reversible austenite-martensite phase transformation can occur, achieving adaptive adjustment of the skeleton diameter by ±3%, effectively compensating for the deformation in the stress concentration area.

[0040] In one embodiment, the gradient elastic buffer layer 8 of the high-strength steel wire rope is made of a composite of silicone and graphene.

[0041] In this embodiment, the gradient buffer design of the gradient elastic buffer layer 8, the outer layer 4 high hardness (70Shore A) silicone provides rigid support to prevent external impact damage; the middle transition layer (50Shore A) realizes stress transfer attenuation; the inner layer low hardness (30Shore A) silicone adheres to the surface of the steel wire bundle to evenly disperse the contact stress. Among them, graphene provides an enhancement effect, improves the thermal conductivity of the composite material, and accelerates heat diffusion. The graphene sheet (thickness 3-5nm) forms a three-dimensional network, which can improve the tensile strength.

[0042] In one embodiment, the fiber volume fraction of the carbon fiber reinforced metal matrix composite core of the high-strength steel wire rope is 50% to 60%, the matrix is ​​titanium aluminum alloy, and the axial tensile strength is not less than 1800 MPa.

[0043] In this embodiment, the carbon fiber reinforced metal matrix composite core is lightweight, high-strength, and has good corrosion resistance.

[0044] In one embodiment, the outer periphery of the carbon fiber reinforced metal matrix composite core of the high-strength steel wire rope is provided with 12 radial convex teeth, the tooth height of the convex teeth is 8% to 10% of the core diameter, and an oil guide groove with an angle of 30° is formed between adjacent convex teeth, and solid lubricating wax is provided in the oil guide groove.

[0045] In this embodiment, torque transmission is optimized, and the convex teeth and the troughs of the corrugated steel wire strands form a mechanical interlock, which improves the torque transmission efficiency. A self-lubricating effect is also achieved. When the temperature is >50°C, the solid lubricating wax (paraffin-based + 5% MoS2) melts and seeps out, forming a 0.5-1.2μm thick lubricating film at the tooth-groove interface.

[0046] In one embodiment, the wavelength of the corrugated steel strands of the high-strength steel wire rope is 4.2 mm and the wave height is 0.6 mm.

[0047] In one embodiment, the peak surface of the corrugated steel strand of the high-strength steel wire rope is provided with a laser-etched groove, the groove has a depth of 20 to 50 μm and a width of 80 to 120 μm, and the groove is coated with a molybdenum disulfide-nano-diamond composite coating.

[0048] In this embodiment, lubricant storage and transportation and anti-wear enhancement are achieved.

[0049] In one embodiment, equidistant gaps are provided between adjacent steel wire bundles of the high-strength steel wire rope, and the gaps are filled with a polyurethane elastomer, wherein the Shore hardness of the polyurethane elastomer is 50A to 70A.

[0050] In this embodiment, stress buffering is achieved by the polyurethane elastomer filled in the gap, and the viscoelastic properties of the polyurethane surface are utilized to convert sliding friction into viscous energy consumption, thereby controlling friction.

[0051] In one embodiment, the corners of the steel wire bundle of the high-strength steel wire rope are provided with a rounded corner structure, and the surface of the rounded corner structure is treated by micro-arc oxidation to form a ceramic layer with a thickness of 10 to 15 μm.

[0052] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength steel wire rope, characterized in that: It includes a steel wire rope body, an external active control device and a control sleeve; The steel wire rope body comprises an outer layer, an intermediate layer, and a core arranged in sequence from the outside to the inside, the outer layer is a six-strand steel wire bundle with a hexagonal cross section, the six-strand steel wire bundle is divided into two or three strands, each of which is twisted in a left-handed constant pitch spiral to form an alternating close-packed structure, the intermediate layer is twelve-strand corrugated steel wire strands with a diamond cross section, the wavelength and wave height ratio of the corrugated steel wire strands is 5:1 to 8:1, the twelve-strand corrugated steel wire strands are twisted in a right-handed variable pitch spiral, and after twisting, the crests and troughs of adjacent strands are arranged in a staggered bite to form a continuous contact surface, and the core is a carbon fiber reinforced metal matrix composite core; The active control device comprises a memory alloy skeleton layer, a gradient elastic buffer layer, and a connection interface which are sequentially arranged from the outside to the inside. The memory alloy skeleton layer is sintered by nickel-titanium shape memory alloy and has temperature and stress dual-triggered phase change characteristics. The hardness of the gradient elastic buffer layer gradually decreases from the outer layer to the inner layer. The connection interface is a hexagonal groove array that forms a geometric interlock with the six-strand steel wire bundle. The active control device also comprises a first memory alloy buckle and a second memory alloy buckle respectively arranged at both ends of the memory alloy skeleton layer. The regulating sleeve is located below the second memory alloy buckle, and includes six groups of electromagnetic coils corresponding to six steel wire bundles respectively. The regulating sleeve also includes six permanent magnets respectively arranged between two adjacent steel wire bundles, and each of the permanent magnets is connected to a guide plate.

2. The high-strength steel wire rope according to claim 1, characterized in that: The memory alloy skeleton layer is a nickel-titanium-based shape memory alloy.

3. The high-strength steel wire rope according to claim 1, characterized in that: The gradient elastic buffer layer is made of a composite of silica gel and graphene.

4. The high-strength steel wire rope according to claim 1, characterized in that: The fiber volume fraction of the carbon fiber reinforced metal matrix composite core is 50% to 60%, the matrix is ​​titanium aluminum alloy, and the axial tensile strength is not less than 1800 MPa.

5. The high-strength steel wire rope according to claim 4, characterized in that: The outer periphery of the carbon fiber reinforced metal matrix composite core is provided with 12 radial convex teeth, the tooth height of the convex teeth is 8% to 10% of the core diameter, and an oil guide groove with an angle of 30° is formed between adjacent convex teeth, and solid lubricating wax is provided in the oil guide groove.

6. The high-strength steel wire rope according to claim 1, characterized in that: The wavelength of the corrugated steel wire strand is 4.2 mm and the wave height is 0.6 mm.

7. The high-strength steel wire rope according to claim 6, characterized in that: The wave crest surface of the corrugated steel wire strand is provided with a laser-etched groove, the groove has a depth of 20 to 50 μm and a width of 80 to 120 μm, and the groove is coated with a molybdenum disulfide-nano-diamond composite coating.

8. The high-strength steel wire rope according to claim 1, characterized in that: An equidistant gap is arranged between adjacent steel wire bundles, and the gap is filled with a polyurethane elastomer, wherein the Shore hardness of the polyurethane elastomer is 50A-70A.

9. The high-strength steel wire rope according to claim 8, characterized in that: The corners of the steel wire bundle are provided with a rounded corner structure, and the surface of the rounded corner structure is treated by micro-arc oxidation to form a ceramic layer with a thickness of 10 to 15 μm.

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