Enhanced tensile wear-resistant multi-twist steel wire rope

Abstract

The invention discloses an enhanced tensile wear-resistant multi-twisted steel wire rope, which relates to the technical field of steel wire ropes, and structurally comprises a multi-twisted steel wire rope formed by twisting three sub-ropes in a left-to-right interactive manner, and each sub-rope is formed by twisting six stranded ropes in a right-to-right interactive manner; the aluminum-based carbon fiber composite core serves as the center of the stranded rope, and the gradient functional layer comprises six center steel wires on the inner layer, twelve micro-arc oxidation concave steel wires on the middle layer, eighteen graphene / zinc-aluminum coating convex steel wires on the outer layer and twelve phase change lubricating fiber bundles on the surface layer. The outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repairing microcapsules, a boehmite / silane interface bonding layer and an Al2O3 / PEEK abrasion-resistant coating. The tensile strength and the structural stability are improved through a three-stage twisting process; the aluminum-based carbon fiber composite core and the gradient functional layer synergistically enhance core bearing, wear resistance and corrosion resistance; the phase change lubricating fiber bundles release lubricating components during friction, and damage repair is achieved through the self-repairing sealing layer; and the interface bonding layer and the wear-resistant coating strengthen the surface adhesive force and the wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire rope, in particular to an enhanced tensile wear-resistant multi-twisted steel wire rope. BACKGROUND

[0002] As an important flexible load-bearing component, steel wire rope plays an irreplaceable role in many fields such as sling, ocean engineering, aerospace, etc. due to its high strength, high toughness and other characteristics. At present, the steel wire ropes widely used in the industry are mostly two-stage twisted process of "material composite strand-strand rope", that is, a plurality of steel wires are twisted into strands, and then a plurality of strands are twisted to form a finished steel wire rope. For such two-stage twisted steel wire rope, a relatively complete standard system has been established at home and abroad, for example, GB / T20118-2017 "General Technical Conditions for Steel Wire Ropes" of China, which clearly specifies its technical parameters, production requirements, performance indicators, etc., supporting the production and application of conventional steel wire ropes.

[0003] However, with the continuous improvement of the performance requirements of steel wire rope in the industrial field, especially in high-end special application scenarios, the tensile, wear-resistant and other structural strength performance of traditional two-stage twisted steel wire rope has been difficult to meet the demand. Multi-twisted steel wire rope (especially the product adopting the three-stage twisting process of "material composite strand-strand rope-rope again") has a unique multi-level twisted structure and exhibits significant advantages in tensile strength, fatigue resistance, wear resistance, etc., which can well adapt to the above performance requirements. SUMMARY

[0004] In view of the technical defects in the background art, the present application proposes an enhanced tensile wear-resistant multi-twisted steel wire rope, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: An enhanced tensile wear-resistant multi-twisted steel wire rope is composed of three sub-ropes twisted in a left alternating manner to form a multi-twisted steel wire rope. The outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repair microcapsules, an interfacial bonding layer composed of boehmite nanosheets and silane coupling agent, and an anti-wear coating layer composed of Al2O3 particles and PEEK powder. The sub rope is composed of 6 strands twisted in right alternating manner, the structure of the strand includes: aluminum-based carbon fiber composite core: the diameter accounts for 20% of the diameter of the strand, which is composed of carbon fiber bundle impregnated with liquid aluminum-silicon alloy (Al-12%Si) and coated NiTi alloy wire spiral grid, the gradient functional layer includes inner layer, middle layer, outer layer and surface layer, the inner layer is 6 central steel wires, the middle layer is 12 concave steel wires, the outer layer is 18 convex steel wires, and the surface layer is 12 phase change lubricating fiber bundles, the phase change lubricating fiber bundle is composed of paraffin / vanadium dioxide (VO2) microcapsule wrapped by ultra-high molecular weight polyethylene sheath layer, the particle size of the microcapsule is 50-100μm, and the diameter of the phase change lubricating fiber bundle is 2.0-2.5mm.

[0005] As a further technical solution of the application, the preparation method of the aluminum-based carbon fiber composite core includes: After the carbon fiber bundle is coated with a 100-200nm silicon carbide transition layer, it is immersed in 700℃ liquid Al-12%Si alloy, impregnated for 10min in a vacuum state, then the NiTi alloy wire is wrapped around the outer periphery of the carbon fiber core in a spiral winding manner, the winding spacing is 3mm, and it is placed in a vacuum furnace, and in the vacuum furnace, 99.999% pure argon gas is introduced at 400-500℃ for 1h, realizing the diffusion bonding of the aluminum matrix and NiTi.

[0006] As a further technical solution of the application, the manufacturing method of the gradient functional layer includes: The middle layer concave steel wire is processed with a nanosecond pulse laser with a power of 10-20W and a frequency of 100kHz to form grooves, and the concave steel wire is micro-arc oxidized in a silicate electrolyte at a voltage of 200-300V for 15-20min to form a 15-20μm ceramic layer; The outer layer convex steel wire is first deposited with 1μm thick graphene on the surface of the steel wire using CVD, and the deposition conditions are: using CH4 / H2 mixed gas, reacting at 500-600℃ for 30min, and then the convex steel wire after depositing graphene is electroplated with a 5μm zinc-aluminum coating using a Zn-Al alloy plating solution containing 5% Al with a current density of 3A / dm².

[0007] As a further technical solution of the application, the preparation method of the interface bonding layer includes: The steel wire rope is first etched by Ar / O2 plasma, the plasma etching power is 50 W, the etching time is 5 min, the surface hydroxyl content is increased, 50 nm boehmite nanosheets are dispersed in an ethanol solution with a concentration of 5 g / L, 1% of γ-glycidoxypropyltrimethoxysilane (KH-560) by mass fraction is added, and the steel wire rope is immersed in the solution after ultrasonic dispersion for 30 min under a ultrasonic power of 200 W. Then, a direct current voltage of 30 V is applied for electrophoretic deposition for 8 min, the electric field strength is 5 V / cm, and a 5-8 μm boehmite nanosheet layer is formed on the surface of the steel wire rope. After deposition, the steel wire rope is cured at 120 ℃ for 30 min.

[0008] As a further technical solution of the present application, the preparation method of the anti-wear coating comprises: The 50 μm and 30 μm Al2O3 particles are mixed at a mass ratio of 1:3 to obtain mixed Al2O3. The mixed Al2O3 and PEEK powder with a particle size of 50 μm are ball-mixed at a ratio of 1:1, and 0.5% of polyethylene glycol (PEG-4000) is added as a dispersant to obtain an anti-wear coating powder. The anti-wear coating powder is electrostatically sprayed on the surface of the interface bonding layer at a voltage of 30 kV, and the powder feeding rate of the electrostatic spraying is 30 g / min. After the spraying is completed, the coating is cured at 250 ℃ by infrared radiation for 30 min to form a 20-25 μm coating.

[0009] As a further technical solution of the present application, the preparation method of the self-repairing sealing layer comprises: Bisphenol A epoxy resin (E-51) and 2-ethyl-4-methyl imidazole are mixed at a mass ratio of 5:1 to 8:1, and are emulsified and coated in an aqueous phase at 55 ℃ to obtain 5-20 μm repair microcapsules. The repair microcapsules are dispersed in a 20% ethanol solution, and 0.5% of BHT antioxidant is added to obtain an impregnating solution. The solid-liquid ratio of the repair microcapsules to the 20% ethanol solution is 1:(50-60). The steel wire rope is placed in the impregnating solution, impregnated at a high pressure of 5 MPa and a temperature of 60 ℃ for 20 min, and then cured at a temperature of 80-100 ℃ for 6 h.

[0010] As a further technical solution of the present application, the preparation method of the phase change lubricating fiber bundle comprises: VO2 powder is dispersed in molten paraffin at 60 ℃, the mass ratio of VO2 to paraffin is 1:5, and ultrasonic treatment is performed for 20 min to make the dispersion degree of VO2 > 95% to obtain a core material. Gelatin and gum arabic are dissolved in pure water at 50 ℃ at a mass ratio of 2:1, and 15% of dialdehyde starch crosslinking agent by mass of gelatin is added, and the pH is adjusted to 4.0-4.5. The solution is reacted at 60 ℃ for 1 hour to form a composite wall material solution. The core material and the wall material are mixed at a mass ratio of 1:3, and are sheared and emulsified in a high-speed dispersion machine at 8000 rpm for 10 min. The wall material is solidified by cooling to 10 ℃, and is filtered and dried to obtain microcapsules with a particle size of 50-100 μm. Microcapsules and ultra-high molecular weight polyethylene (UHMWPE) chopped fibers were dispersed in a DMAc solvent at a mass ratio of 30:70, and 0.5 wt% of antioxidant 1010 was added to obtain a spinning solution. The spinning solution was extruded through a spinneret with a pore size of 0.15 mm into a coagulation bath with a volume ratio of DMAc to water of 1:4 and a drawing rate of 15 m / min to obtain a precursor. The precursor was first washed with pure water at 20°C for 10 h, then washed with water containing 0.1 wt% of penetrant JFC at 40°C for 12 h, and finally washed with soft water at 60°C for 8 h to obtain a wet tow. The wet yarn bundle was pre-dried by a hot roller at 60°C to reduce the moisture content to 30%, and was drawn at a draft ratio of 3.5:1. It was irradiated with a dose of 80 kGy under nitrogen protection to solidify the wet yarn bundle to obtain a fiber bundle. The fiber bundle was twisted on a stranding machine with a twist length of 39.0 mm, and then shaped in a hot air circulation oven at 70°C for 30 minutes. The tension was controlled at 0.5 cN / dtex to obtain a phase change lubricated fiber bundle.

[0011] As a further technical solution of the present invention, the method for preparing the steel wire rope includes: S1. Steel wire reinforcement A 5mm diameter smooth steel wire was drawn multiple times to a diameter of 0.95mm. The drawn steel wire was immediately passed through a PECVD device, where 50sccm of acetylene gas was introduced and a negative bias of 1000V was applied to deposit a 0.5μm diamond-like carbon film. A 3μm ZnO-Al2O3 composite ceramic layer was then deposited using a Zn / Al target at a power of 5kW to obtain a central steel wire. S2. Rope Manufacturing With an aluminum-based carbon fiber composite core as the center, a four-layer structure with gradient functional layers is twisted layer by layer on the outer layer: Inner layer: 6 S1 reinforced central steel wires, with a right-hand twist of 21-30mm, wrapped around the outer periphery of the aluminum-based carbon fiber composite core; Middle layer: 12 concave steel wires, with a left-hand lay of 50-55mm, wrapped around the outer periphery of the inner layer center wire; Outer layer: 18 convex steel wires, with a right-hand lay of 60-65mm, wrapped around the outer periphery of the concave steel wires in the middle layer; Surface layer: 12 phase change lubricated fiber bundles, with a twist pitch of 80-85mm and left-hand twist, wrapped around the outer convex steel wire; The tension of each layer is controlled during twisting: 80-100cN for the center wire, 65-75cN for the concave wire, and 55-65cN for the convex wire. The tension of the phase change lubricated fiber bundle matches the overall twisting requirements of the strand, and finally merges to form a strand. S3.Multiple twisting 6 strands of S2 obtained by the S2 are synchronously fed into the rope combining machine through the strand distribution disc, and the ropes are combined in the right alternating twisting mode, the twisting pitch is 180.0 mm, the traction speed is 1.8 m / min, the twisting speed is 10.0 RPM, and the sub-rope is formed; 3 sub-ropes are combined in the left alternating twisting mode, the twisting pitch is 344.0 mm, the traction speed is 1.8 m / min, and the twisting speed is 5.2 RPM, and the steel wire rope is formed; then the self-repairing sealing layer is formed by impregnating on the surface of the steel wire rope, the interface bonding layer is formed by electrophoretic deposition, and the wear-resistant coating is formed by electrostatic spraying, and the finished steel wire rope is obtained.

[0012] The application has the beneficial effects that: The enhanced tensile wear-resistant multi-twisted steel wire rope has the following beneficial effects: the three-level twisting process of "material composite strand-strand rope-rope recombination", the hierarchical structure of 3 sub-ropes left alternating twisting and strand rope right alternating twisting, greatly improve the overall tensile strength and structural stability. The aluminum-based carbon fiber composite core combines carbon fiber reinforcement and NiTi alloy wire spiral grid to strengthen the core bearing capacity; the gradient functional layer cooperates to improve the wear resistance and corrosion resistance through the diamond-like carbon film of the center wire, the composite ceramic layer, the ceramic layer of the middle concave wire, and the graphene and zinc aluminum coating of the outer convex wire. The paraffin / VO2 microcapsule of the phase change lubricating fiber bundle can release lubricating components during friction, reducing fatigue wear, and the repair microcapsule of the surface self-repairing sealing layer can automatically repair after damage, cooperating with the enhanced adhesion of the interface bonding layer and the Al2O3 / PEEK composite structure of the wear-resistant coating, further improving the wear resistance and sealing corrosion resistance. The synergistic effect of the overall structure and each functional layer makes the steel wire rope excellent in tensile, wear-resistant, fatigue-resistant and self-repairing, and suitable for high-end special scene needs. DETAILED DESCRIPTION

[0013] The embodiments of the application are described below in conjunction with relevant examples, and the embodiments of the application are not limited to the following examples, and the application relates to related necessary components in the technical field, which should be regarded as known technology in the technical field and can be known and mastered by the person skilled in the art.

[0014] An enhanced tensile wear-resistant multi-twisted steel wire rope is formed by 3 sub-ropes in the left alternating twisting mode, and the outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repair microcapsules, an interface bonding layer composed of boehmite nanosheets and silane coupling agents, and a wear-resistant coating composed of Al2O3 particles and PEEK powder. The sub rope is composed of 6 strands twisted in right alternating manner, and the structure of the strand includes: an aluminum-based carbon fiber composite core, the diameter of which accounts for 20% of the diameter of the strand, and is composed of a carbon fiber bundle impregnated with liquid aluminum-silicon alloy (Al-12%Si) and a wrapped NiTi alloy wire spiral grid, the gradient functional layer includes an inner layer, a middle layer, an outer layer and a surface layer, the inner layer is 6 central steel wires, the middle layer is 12 concave steel wires, the outer layer is 18 convex steel wires, and the surface layer is 12 phase change lubricating fiber bundles, the phase change lubricating fiber bundle is composed of an ultra-high molecular weight polyethylene sheath layer wrapping paraffin / VO2 microcapsules, the particle size of the microcapsules is 50-100 mu m, and the diameter of the phase change lubricating fiber bundle is 2.0-2.5 mm.

[0015] The enhanced tensile wear-resistant multi-twisted steel wire rope of the present application forms a systematic tensile wear-resistant enhancement mechanism from the overall structure to the core and surface functional layer through the synergistic cooperation of each hierarchical structure.

[0016] On the overall structure, a three-stage twisting process of "material composite strand-strand rope-rope recombination" is adopted, 3 sub ropes are twisted in left alternating manner, and the sub rope is composed of 6 strands twisted in right alternating manner, this hierarchical alternating twisting structure can disperse the load and reduce local stress concentration when the steel wire rope is under stress, and greatly improves the overall structural stability and tensile load capacity.

[0017] In the core structure, the aluminum-based carbon fiber composite core serves as the central support of the strand, and after the carbon fiber bundle is coated with a silicon carbide transition layer and impregnated with an aluminum-silicon alloy, it is combined with a NiTi alloy wire spiral grid, which not only utilizes the high strength of carbon fiber to enhance the core load capacity, but also utilizes the elasticity of NiTi alloy and the spiral grid structure to buffer external force impact, further strengthening the tensile performance of the core.

[0018] The steel wires of each level of the gradient functional layer form a synergistic effect through differential treatment: the central steel wire of the inner layer is deposited with a diamond-like carbon film and a ZnO-Al2O3 composite ceramic layer after drawing, which improves the surface hardness and wear resistance; the concave steel wire of the middle layer is processed with grooves by laser and forms a ceramic layer by micro-arc oxidation, the grooves enhance the bonding force with the adjacent structure, and the ceramic layer strengthens the wear resistance and corrosion resistance; the convex steel wire of the outer layer is deposited with graphene and zinc-aluminum coating, the lubricity of graphene reduces friction and wear, and the zinc-aluminum coating improves the corrosion resistance and wear resistance; the phase change lubricating fiber bundle of the surface layer contains paraffin / VO2 microcapsules, which releases lubricating components during friction, reduces the friction loss between the steel wires of each level, and reduces fatigue wear, forming a progressive wear protection system from the inside to the outside.

[0019] The three-layer functional coating on the surface of the steel wire rope further enhances the wear resistance and protection capability. The repair microcapsules in the self-repairing sealing layer release repair agents when the coating is damaged to prevent the damage from expanding, and the sealed environment reduces the intrusion of external corrosive media. The interface bonding layer increases the hydroxyl groups on the surface of the steel wire rope through plasma etching, and then combines the boehmite nanosheets and the electrophoretic deposition of silane coupling agents to greatly improve the adhesion of the outer wear-resistant coating and avoid the peeling of the coating. The wear-resistant coating adopts a composite structure of Al2O3 particles and PEEK powder. The high hardness of Al2O3 provides excellent wear resistance, and the toughness of PEEK relieves impact, and the combination of the two directly resists external friction and wear.

[0020] In summary, the overall hierarchical twisted structure improves the tensile resistance, the core composite core strengthens the core bearing, the gradient functional layer realizes the internal wear resistance and lubrication synergy, the surface three-layer coating forms the external wear-resistant-repairing-adhesion protection system, and each structure cooperates with each other, finally showing the significant enhanced tensile wear-resistant properties.

[0021] As one of the preferred embodiments of the present application, the preparation method of the aluminum-based carbon fiber composite core comprises: After the carbon fiber bundle is coated with a 100-200 nm silicon carbide transition layer, it is immersed in a 700℃ liquid Al-12%Si alloy, and immersed for 10 minutes in a vacuum state. Then, a NiTi alloy wire is wrapped around the outer periphery of the carbon fiber core in a spiral winding manner with a winding spacing of 3mm, and placed in a vacuum furnace. In the vacuum furnace, pure argon gas with a purity of 99.999% is introduced to heat at 400-500℃ for 1 hour to realize the diffusion bonding of the aluminum matrix and the NiTi.

[0022] The preparation method of the aluminum-based carbon fiber composite core strengthens the performance of the aluminum-based carbon fiber composite core through interface optimization and diffusion bonding. Coating a silicon carbide transition layer can inhibit the harmful reaction between carbon fiber and aluminum matrix and enhance the interfacial bonding strength. Vacuum immersion of liquid aluminum-silicon alloy can ensure that the aluminum liquid fully penetrates the carbon fiber bundle, improving the density and strength of the core body. The spiral winding of the NiTi alloy wire forms an elastic support grid, which utilizes the shape memory effect to enhance the toughness and impact resistance of the core body. The diffusion bonding of the aluminum matrix and the NiTi in the vacuum argon environment forms a firm metallurgical bonding interface, avoiding interlayer peeling. The overall process enables the composite core to have both high strength of carbon fiber and toughness of metal matrix, significantly improving the core bearing capacity of the steel wire rope.

[0023] As one of the preferred embodiments of the present application, the manufacturing method of the gradient functional layer comprises: The middle layer concave wire is processed with a nanosecond pulse laser with a power of 10-20W and a frequency of 100kHz to form grooves. The concave wire is micro-arc oxidized in a silicate electrolyte at a voltage of 200-300V for 15-20min to form a 15-20μm ceramic layer. The outer convex steel wire is first coated with graphene with a thickness of 1 μm by CVD under the following conditions: using CH4 / H2 mixed gas, reacting at 500-600 ℃ for 30 min. The convex steel wire coated with graphene is then coated with a 5 μm zinc-aluminum coating by electroplating using a current density of 3 A / dm2 and a Zn-Al alloy plating solution containing 5% Al.

[0024] The middle concave steel wire is processed by nanosecond pulse laser to form a regular concave structure by locally melting and evaporating the surface of the steel wire using high energy density of the laser, thereby increasing the contact area with the adjacent layer and improving the bonding force. Micro-arc oxidation in a silicate electrolyte generates a dense Al2O3-based ceramic layer by triggering plasma chemical reaction under high voltage, thereby enhancing wear resistance and corrosion resistance by using the high hardness of the ceramic. The outer convex steel wire is coated with graphene on the surface of the steel wire by CVD at high temperature by decomposing CH4 to obtain carbon atoms, thereby reducing the friction coefficient by using the interlayer slip property of graphene. The zinc-aluminum coating is uniformly deposited by electroplating to form a sacrificial anode protection layer, thereby improving the corrosion resistance, and at the same time, synergistically enhancing the surface hardness with graphene. The two are processed differently to form a gradient wear-resistant and corrosion-resistant system. The middle layer is strengthened by the structure and combined with the basic wear resistance, and the outer layer optimizes lubrication and long-term protection, thereby synergistically improving the overall wear resistance and corrosion resistance of the rope.

[0025] As one of the preferred embodiments of the present application, the preparation method of the interface bonding layer comprises: The steel wire rope is first etched by Ar / O2 plasma with a plasma etching power of 50 W and an etching time of 5 min to increase the content of surface hydroxyl groups. 50 nm boehmite nanosheets are dispersed in an ethanol solution with a concentration of 5 g / L, and 1% by mass of γ-glycidoxypropyltrimethoxysilane (KH-560) is added. The nanosheets are dispersed under an ultrasonic power of 200 W for 30 min. After the steel wire rope is immersed in the solution, a direct current voltage of 30 V is applied for electrophoretic deposition for 8 min, and the electric field strength is 5 V / cm. A 5-8 μm boehmite nanosheet layer is formed on the surface of the steel wire rope, and the deposition is solidified at 120 ℃ for 30 min.

[0026] The preparation method strengthens the coating layer by surface activation and interface bridging. Ar / O2 plasma etching uses high-energy particles to bombard the surface of the steel wire rope to remove contaminants and introduce hydroxyl groups, thereby improving surface activity and wettability. The boehmite nanosheets are dispersed by ultrasonic and then electrophoretically deposited under the action of an electric field to form a uniform coating layer. The sheet structure increases the contact area. The KH-560 silane coupling agent reacts with boehmite (inorganic phase) and wear-resistant coating (organic-inorganic composite phase) through two end groups to build a chemical bridge. 120 ℃ solidification promotes the crosslinking of the coupling agent to form a stable interface layer. This layer can significantly improve the adhesion of the wear-resistant coating to the steel wire rope, prevent the coating from peeling off, and at the same time, enhance the sealing and corrosion resistance of the overall structure.

[0027] As one of the preferred embodiments of the present application, the preparation method of the anti-wear coating comprises: The 50 μm and 30 μm Al2O3 particles are mixed in a mass ratio of 1:3 to obtain mixed Al2O3, the mixed Al2O3 is ball-mixed with PEEK powder with a particle size of 50 μm in a ratio of 1:1, and 0.5% polyethylene glycol (PEG-4000) is added as a dispersant to obtain an anti-wear coating powder. The anti-wear coating powder is electrostatically sprayed on the surface of the interfacial bonding layer at a voltage of 30 kV, the powder feeding rate of the electrostatic spraying is 30 g / min, and after the spraying is completed, the coating is cured at 250°C for 30 min to form a 20-25 μm coating.

[0028] The mixed Al2O3 particles of different particle sizes can improve the bulk density and enhance the coating density; the 1:1 composite with the PEEK powder forms a rigid-flexible collaborative structure by taking advantage of the high hardness of Al2O3 and the toughness of PEEK, and gives consideration to wear resistance and impact resistance. The PEG dispersant ensures uniform mixing of the powder, the electrostatic spraying uniformly attaches the powder to the interfacial layer through electrostatic adsorption, the 30 kV voltage and the specific powder feeding rate ensure uniform coating thickness, and the 250°C curing makes the PEEK melt and bond with the Al2O3 particles to form a 20-25 μm strong coating. The coating directly resists external friction and wear, protects the surface of the steel wire rope, and cooperates with the interfacial bonding layer to improve the overall wear resistance and service life.

[0029] As one of the preferred embodiments of the present application, the preparation method of the self-repairing sealing layer comprises: The bisphenol A epoxy resin (E-51) is mixed with 2-ethyl-4-methyl imidazole in a mass ratio of 5:1 to 8:1, emulsified and coated in a 55°C aqueous phase to obtain 5-20 μm repair microcapsules. The repair microcapsules are dispersed in a 20% ethanol solution, 0.5% BHT antioxidant is added to obtain an impregnating solution, the solid-liquid ratio of the repair microcapsules to the 20% ethanol solution is 1:(50-60), the steel wire rope is placed in the impregnating solution, impregnated at a high pressure of 5 MPa and a temperature of 60°C for 20 min, and then cured at a temperature of 80-100°C for 6 h.

[0030] The self-repairing sealing function is realized by microcapsule coating and high-pressure impregnation. The bisphenol A epoxy resin and the imidazole curing agent are mixed in a certain ratio, the repair microcapsules are formed by emulsification and coating, the 55°C aqueous phase environment ensures the stability of the capsule wall, the BHT antioxidant can delay the oxidation of the repair agent, the high pressure of 5 MPa and the temperature of 60°C can promote the microcapsules to fully penetrate the surface layer of the steel wire rope and be uniformly distributed, and the curing at a temperature of 80-100°C forms a continuous film structure of the sealing layer. When the coating is damaged, the microcapsules rupture to release the repair agent, which reacts with the curing agent to fill the cracks, thereby realizing self-repairing. At the same time, the sealing layer isolates corrosive media such as water and oxygen, thereby improving the corrosion resistance and service life of the steel wire rope.

[0031] As one of the preferred embodiments of the present application, the preparation method of the phase change lubricating fiber bundle comprises: VO2 powder is dispersed in molten paraffin at 60°C, the mass ratio of VO2 to paraffin is 1:5, and ultrasonic treatment is performed for 20 min to make the dispersion degree of VO2 greater than 95%, thereby obtaining a core material; gelatin and gum arabic are dissolved in pure water at 50°C according to a mass ratio of 2:1, a double-aldehyde starch crosslinking agent is added in an amount of 15% of the mass of the gelatin, the pH is adjusted to 4.0-4.5, and reaction is performed at 60°C for 1 hour to form a composite wall material solution; and the core material and the wall material are mixed according to a mass ratio of 1:3, sheared and emulsified in a high-speed dispersion machine at 8000 rpm for 10 min, the wall material is solidified by cooling to 10°C, and filtration and drying are performed to obtain microcapsules with a particle size of 50-100 μm; The microcapsules and UHMWPE short fibers are dispersed in DMAc solvent according to a mass ratio of 30:70, and 0.5 wt% antioxidant 1010 is added to obtain a spinning solution; the spinning solution is extruded through a spinneret with a pore size of 0.15 mm into a coagulation bath, the volume ratio of DMAc to water in the coagulation bath is 1:4, and the drawing speed is 15 m / min to obtain a precursor; the precursor is first washed in pure water at 20°C for 10 h, then washed in water containing 0.1 wt% penetrant JFC at 40°C for 12 h, and finally washed in soft water at 60°C for 8 h to obtain a wet fiber bundle; The wet fiber bundle is pre-dried by a hot roller at 60°C, the water content is reduced to 30%, drawing is performed according to a drawing ratio of 3.5:1, the wet fiber bundle is solidified by irradiation under nitrogen protection at a dose of 80 kGy, and a fiber bundle is obtained; after twisting on a twisting machine with a twist pitch of 39.0 mm, the fiber bundle is set in a hot air circulating oven at 70°C for 30 min, and the tension is controlled to be 0.5 cN / dtex to obtain a phase change lubricating fiber bundle.

[0032] The preparation method of the phase change lubricating fiber bundle realizes dynamic lubrication through microcapsule storage and release and fiber forming; first, VO2 powder is dispersed in molten paraffin to form a core material, a gelatin-gum arabic composite wall material is used for coating, and microcapsules containing a lubricating component are prepared by emulsification and solidification; VO2 can trigger the release of the core material with temperature phase change; then, the microcapsules and UHMWPE short fibers are dispersed and spun, a precursor with a UHMWPE sheath is formed through coagulation bath forming and multi-stage water washing to remove solvents; the wet fiber bundle is pre-dried to control the moisture, the strength is increased by drawing, and the structure is stabilized by irradiation and solidification, and finally the wet fiber bundle is twisted and set to obtain a fiber bundle.

[0033] The UHMWPE sheath provides wear-resistant support, the microcapsules release paraffin lubrication when friction or temperature changes to reduce the friction loss between the steel wires inside the strand rope; the phase change characteristics of VO2 can respond to environmental changes to adjust the amount of lubrication release, realize dynamic lubrication, and improve the fatigue resistance and service life of the steel wire rope, and adapt to long-term and efficient operation of the multiple twist structure.

[0034] As one of the preferred embodiments of the present application, the preparation method of the steel wire rope comprises: S1. Steel wire strengthening Smooth steel wires with a diameter of 5 mm were drawn multiple times to a diameter of 1.12 mm. The drawn steel wires were immediately introduced into a PECVD device, 50 seem acetylene gas was introduced and a 0.5 μm diamond-like carbon film was deposited by applying a negative bias of 1000 V. Then, a ZnO-Al2O3 composite ceramic layer was deposited by a Zn / Al target with a power of 5 kW, to obtain a center steel wire; S2. Strand manufacturing A 1 aluminum-based carbon fiber composite core was taken as the center, and four layers of gradient functional layers were twisted layer by layer on the outer layer in sequence: Inner layer: 6 center steel wires strengthened by S1 were right alternately twisted with a lay length of 21-30 mm to cover the outer periphery of the aluminum-based carbon fiber composite core; Middle layer: 12 concave steel wires were left alternately twisted with a lay length of 35-45 mm to cover the outer periphery of the inner layer center steel wires; Outer layer: 18 convex steel wires were right alternately twisted with a lay length of 50-60 mm to cover the outer periphery of the middle layer concave steel wires; Surface layer: 12 phase change lubricating fiber bundles were left alternately twisted with a lay length of 70-80 mm to cover the outer periphery of the outer layer convex steel wires; The tension was controlled during twisting of each layer: the center steel wire was 80-100 cN, the concave steel wire was 70-90 cN, the convex steel wire was 60-80 cN, and the phase change lubricating fiber bundle tension matched the overall twisting requirement of the strand, and finally the strands were combined to form a strand; S3. Multiple twisting 6 strands obtained by S2 were fed into a rope machine through a line distributor, and were right alternately twisted to form a sub-rope with a lay length of 180.0 mm, a traction speed of 1.8 m / min, and a twisting speed of 10.0 RPM. 3 sub-ropes were left alternately twisted to form a steel wire rope with a lay length of 344.0 mm, a traction speed of 1.8 m / min, and a twisting speed of 5.2 RPM. Then, a self-repairing sealing layer was formed on the surface of the steel wire rope by impregnation, an interfacial bonding layer was formed by electrophoretic deposition, and a wear-resistant coating was formed by electrostatic spraying, to obtain a finished steel wire rope.

[0035] The above steel wire rope preparation method realizes performance improvement through hierarchical strengthening and precise twisting. In S1, the smooth steel wires are refined and work-hardened through multiple drawing, thereby improving the basic strength. The diamond-like carbon film deposited by PECVD enhances the surface wear resistance with high hardness, and the subsequent ZnO-Al2O3 composite ceramic layer further enhances the wear resistance and corrosion resistance, thereby laying a high-strength foundation for the center steel wire.

[0036] S2 strand manufacturing takes an aluminum-based carbon fiber composite core as the center, and twists four layers of structures in layers: the inner layer of right alternating twist of the strengthened center steel wire provides tight support, the middle layer of concave steel wire and the outer layer of convex steel wire balance stress through alternating twist (left and right alternating twist) to avoid relaxation, and different twist pitches adapt to the diameter and functional requirements of each layer; the tension of each layer is differentially controlled to match the characteristics of the steel wire to ensure uniform twisting. The surface layer of left alternating twist of phase change lubricating fiber bundle can reduce interlayer friction and synergistically improve the overall stability of the strand.

[0037] In S3 multiple twist, the strand is right alternating twisted into a sub rope, the sub rope is left alternating twisted into a steel wire rope, and the level reverse twist cancels out the torsional stress to improve the torsional and tensile properties; precise control of twist pitch and speed parameters ensures dense and uniform twisting. The final surface forms three layers of coatings in turn, which cooperate with the internal structure to build an "inner strong core - middle wear-resistant - outer protective" system, realizing enhanced tensile and wear-resistant properties.

[0038] Example 1 S1. Steel wire strengthening Smooth steel wire with a diameter of 5 mm is drawn multiple times to a diameter of 0.95 mm, and the drawn steel wire is immediately introduced into a PECVD device, 50 seem acetylene gas is introduced and a 1000V negative bias is applied, and a 0.5μm diamond-like carbon film is deposited; then the Zn / Al target is turned on, and a 3μm ZnO-Al2O3 composite ceramic layer is deposited at a power of 5kW, to obtain a center steel wire.

[0039] S2. Strand manufacturing Take 1 aluminum-based carbon fiber composite core as the center, and twist four layers of gradient functional layers in layers on the outer layer: Inner layer: 6 center steel wires strengthened by S1 are right alternating twisted around the outer periphery of the aluminum-based carbon fiber composite core with a twist pitch of 21 mm, and the tension is controlled to be 80cN during twisting; Middle layer: 12 concave steel wires (processed by power 20W, frequency 100kHz nanosecond pulse laser, and 15μm ceramic layer is formed by micro-arc oxidation in silicate electrolyte at a voltage of 200-300V for 20min), left alternating twisted around the outer periphery of the inner layer center steel wire with a twist pitch of 50mm, and the tension is controlled to be 65cN; Outer layer: 18 convex steel wires (1μm graphene is deposited by CVD in a 500℃, CH4 / H2 mixed gas environment, and then 5μm zinc-aluminum coating is electroplated in a Zn-Al alloy plating solution containing 5% Al at a current density of 3A / dm²), right alternating twisted around the outer periphery of the middle layer concave steel wire with a twist pitch of 60mm, and the tension is controlled to be 55cN; Surface layer: 12 phase change lubricating fiber bundles (prepared by microcapsule preparation, spinning forming, twisting and shaping, etc., diameter 2.0mm), left alternating twisted around the outer periphery of the outer layer convex steel wire with a twist pitch of 80mm, and the tension matches the overall twisting requirements of the strand; The four layers are combined to form a strand.

[0040] S3. Multiple twisting Six strands prepared by S2 are fed into a stranding machine through a distributor, and are twisted into sub-ropes in a right alternating manner, with a twist pitch of 180.0 mm, a traction speed of 1.8 m / min, and a twisting speed of 10.0 RPM. Three sub-ropes are taken and twisted into a steel wire rope in a left alternating manner, with a twist pitch of 344.0 mm, a traction speed of 1.8 m / min, and a twisting speed of 5.2 RPM. Subsequently, the surface of the steel wire rope is treated: first, it is immersed in an impregnating solution containing repair microcapsules (5-20 μm microcapsules of bisphenol A epoxy resin E-51 and 2-ethyl-4-methyl imidazole in a mass ratio of 5:1-8:1, dispersed in a 20% ethanol solution, solid-liquid ratio 1:(50-60), containing 0.5% BHT antioxidant) at 5 MPa high pressure and 60°C for 20 min, and cured at 80-100°C for 6 h to form a self-repairing sealing layer; then, after Ar / O2 plasma etching (50 W power, 5 min), it is immersed in an ethanol solution containing 50 nm boehmite nanosheets and 1% KH-560 (5 g / L), ultrasonically dispersed at 200 W for 30 min, and electrophoretically deposited at a direct current voltage of 30 V for 8 min (electric field strength 5 V / cm), and cured at 120°C for 30 min to form a 5-8 μm interfacial bonding layer; finally, an anti-wear powder made of mixed Al2O3 (50 μm and 30 μm particles mixed at a ratio of 1:3) and PEEK powder (1:1 mass ratio, containing 0.5% PEG-4000) is electrostatically sprayed onto the surface of the interfacial bonding layer at a voltage of 30 kV and a powder feeding rate of 30 g / min, and is cured by infrared radiation at 250°C for 30 min to form a 20 μm anti-wear coating, thereby obtaining the finished steel wire rope.

[0041] Comparative Example 1 The difference from Example 1 is that the aluminum-based carbon fiber composite core is prepared without coating a silicon carbide transition layer, and without winding a NiTi alloy wire, but by directly immersing the carbon fiber bundle into a liquid Al-12%Si alloy for impregnation and then forming; the remaining steps (S1-S3 and each coating treatment) are consistent with Example 1.

[0042] Comparative Example 2 The difference from Example 1 is that the strand surface layer does not use phase change lubricated fiber bundles, but is replaced by 12 ordinary ultra-high molecular weight polyethylene fiber bundles (diameter 2.0 mm) without phase change lubrication treatment; the remaining steps (S1-S3 and each coating treatment) are consistent with Example 1.

[0043] Comparative Example 3 The difference from Example 1 is that in S3, both the sub rope and the main rope are right interlaced (the sub rope twist pitch is 180.0 mm, the main rope twist pitch is 344.0 mm, and the rest of the twist parameters remain unchanged); the rest of the steps (S1-S2 and each coating treatment) are consistent with Example 1.

[0044] Comparative Example 4 The difference from Example 1 is that in S3, the self-repairing sealing layer is not impregnated and cured, and the interface bonding layer and the wear-resistant coating are directly deposited on the surface of the steel wire rope by electrophoresis and electrostatic spraying; the rest of the steps (S1-S2 and interface bonding layer and wear-resistant coating treatment) are consistent with Example 1.

[0045] Comparative Example 5 The difference from Example 1 is that the wear-resistant coating only uses PEEK powder (without Al2O3 particles), and forms a 20 μm coating according to the electrostatic spraying and curing parameters of Example 1; the rest of the steps (S1-S3 and self-repairing sealing layer and interface bonding layer treatment) are consistent with Example 1.

[0046] Performance Test The following related performance tests were performed on Example 1 and Comparative Examples 1-5: breaking tension test according to GB / T8358-2023, torsion times test according to GB / T239.1-2012, reciprocating friction times test according to ISO4649:2017, coating wear amount test according to ASTM D968-2017, and bending fatigue test according to GB / T12347-2018. The test results are shown in the following table:

[0047] From the performance comparison data of Example 1 and Comparative Examples 1-5, the following conclusions can be drawn.

[0048] First, the optimization design of the aluminum-based carbon fiber composite core has a significant effect on the tensile performance of the steel wire rope. Comparative Example 1 has a breaking tension of 680.4 kN, which is much lower than the 799.9 kN of Example 1, because the aluminum-based carbon fiber composite core is not coated with a silicon carbide transition layer and is not wrapped with NiTi alloy wire. This shows that the silicon carbide transition layer can enhance the bonding force between the carbon fiber and the aluminum matrix, and the NiTi alloy wire spiral grid can improve the core bearing capacity and the ability to buffer external force impact. The combination of the two effectively improves the tensile strength of the steel wire rope.

[0049] Secondly, the phase change lubricating fiber bundle plays an important role in the wear resistance and fatigue resistance of the steel wire rope. After the ordinary ultra-high molecular weight polyethylene fiber bundle is used to replace the phase change lubricating fiber bundle in the comparative example 2, the reciprocating friction frequency is reduced to 7800 times, and the bending fatigue frequency is 52000 times, which are lower than 11500 times and 65000 times of the embodiment 1 respectively. The coating wear amount is also increased from 39 mg / km to 52 mg / km. This shows that the paraffin / VO2 microcapsules in the phase change lubricating fiber bundle release lubricating components during friction, which can reduce the friction loss between the steel wires at different levels and reduce the fatigue wear, thereby improving the wear resistance and fatigue resistance of the steel wire rope.

[0050] Furthermore, the hierarchical inter-twisted manner has a great influence on the structural stability and torsional resistance of the steel wire rope. In the comparative example 3, the sub-rope and the main rope are right inter-twisted, and the torsional frequency is only 18 times, which is significantly less than 28 times of the embodiment 1. This shows that the hierarchical structure of the left inter-twisted three sub-ropes and the right inter-twisted strand rope can balance the torsional stress and reduce the local stress concentration, thereby greatly improving the torsional resistance and overall structural stability of the steel wire rope.

[0051] In addition, the coating wear amount of the comparative example 4 without the self-repairing sealing layer is 98 mg / km, which is much higher than 39 mg / km of the embodiment 1. This is because the repair microcapsules in the self-repairing sealing layer can automatically repair when the coating is damaged, prevent the damage from expanding, and reduce the invasion of external corrosive media in the sealed environment, thereby effectively reducing the wear of the coating.

[0052] Finally, the addition of Al2O3 particles in the wear-resistant coating can significantly enhance the wear resistance. The wear-resistant coating of the comparative example 5 only uses PEEK powder, and the coating wear amount is 72 mg / km, which is higher than 39 mg / km of the embodiment 1. This shows that the high hardness of Al2O3 particles combined with the toughness of PEEK can provide more excellent wear resistance, directly resist external friction and wear, and protect the surface of the steel wire rope.

[0053] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A reinforced tensile wear-resistant multi-twist steel wire rope, characterized by: The multi-twist steel wire rope is composed of three strands twisted in a left-hand alternating lay. The outer surface of the steel wire rope is coated with a self-repairing sealing layer containing repair microcapsules, an interfacial bonding layer composed of boehmite nanosheets and silane coupling agent, and an anti-wear coating composed of Al2O3 particles and PEEK powder. The sub-rope is composed of 6 strands twisted in a right-hand alternating twist manner. The strand structure includes an aluminum-based carbon fiber composite core and a gradient functional layer. The diameter of the aluminum-based carbon fiber composite core accounts for 20% of the strand diameter and is composed of a carbon fiber bundle impregnated with liquid aluminum silicon alloy (Al-12% Si) and a coated NiTi alloy wire spiral grid composite. The gradient functional layer includes an inner layer, a middle layer, an outer layer and a surface layer. The inner layer is 6 central steel wires, the middle layer is 12 concave steel wires, the outer layer is 18 convex steel wires, and the surface layer is 12 phase change lubricating fiber bundles. The phase change lubricating fiber bundles are composed of paraffin / vanadium dioxide (VO2) microcapsules wrapped in an ultra-high molecular weight polyethylene sheath. The particle size of the microcapsules is 50-100 μm, and the diameter of the phase change lubricating fiber bundle is 2.0-2.5 mm.

2. The steel wire rope according to claim 1, characterized in that: The preparation method of the aluminum-based carbon fiber composite core comprises: After coating the carbon fiber bundle with a 100-200nm silicon carbide transition layer, it was immersed in 700℃ liquid Al-12%Si alloy and immersed in vacuum for 10 minutes. Then, NiTi alloy wire was spirally wrapped around the outer periphery of the carbon fiber core with a winding spacing of 3mm. The core was placed in a vacuum furnace and kept warm at 400-500℃ for 1 hour with 99.999% pure argon gas to achieve diffusion bonding between the aluminum matrix and NiTi.

3. The steel wire rope according to claim 1, characterized in that: The manufacturing method of the gradient functional layer comprises: The concave steel wire in the middle layer is grooved using a nanosecond pulsed laser with a power of 10-20W and a frequency of 100kHz. The concave steel wire is micro-arc oxidized in a silicate electrolyte at a voltage of 200-300V for 15-20min to form a 15-20μm ceramic layer. The outer convex steel wire is first coated with 1μm thick graphene using CVD. The deposition conditions are: using a CH4 / H2 mixed gas at 500-600℃ for 30min. The convex steel wire after graphene deposition is then electroplated with a 5μm zinc-aluminum coating using a Zn-Al alloy plating solution with a current density of 3A / dm² and 5% Al.

4. The steel wire rope according to claim 1, characterized in that: The preparation method of the interface bonding layer comprises: The steel wire rope was first etched by Ar / O2 plasma with a plasma etching power of 50W and an etching time of 5 minutes to increase the surface hydroxyl content. 50nm boehmite nanosheets were dispersed in a 5g / L ethanol solution, and 1% mass fraction of γ-glycidyloxypropyltrimethoxysilane (KH-560) was added. The solution was dispersed for 30 minutes under an ultrasonic power of 200W. After the steel wire rope was immersed in the solution, a 30V DC voltage was applied for electrophoretic deposition for 8 minutes with an electric field strength of 5V / cm to form a 5-8μm boehmite nanosheet layer on the surface of the steel wire rope. After deposition, the solution was cured at 120°C for 30 minutes.

5. The steel wire rope according to claim 1, characterized in that: The preparation method of the wear-resistant coating comprises: 50μm and 30μm Al2O3 particles are mixed in a mass ratio of 1:3 to form mixed Al2O3, and the mixed Al2O3 is ball-milled with PEEK powder with a particle size of 50μm in a ratio of 1:1, and 0.5% polyethylene glycol (PEG-4000) is added as a dispersant to obtain an anti-wear coating powder. The anti-wear coating powder is electrostatically sprayed on the surface of the interface bonding layer with a voltage of 30kV and a powder feeding rate of 30g / min. After spraying, it is cured by infrared radiation at 250°C for 30min to form a 20-25μm coating.

6. The multifilament rope according to claim 1, characterized in that: The preparation method of the self-repairing sealing layer comprises: Bisphenol A epoxy resin (E-51) and 2-ethyl-4-methylimidazole are mixed in a mass ratio of 5:1 to 8:1, emulsified and coated in an aqueous phase at 55°C to obtain 5-20 μm repair microcapsules. The repair microcapsules are dispersed in a 20% ethanol solution, and 0.5% BHT antioxidant is added to obtain an impregnation solution. The solid-liquid ratio of the repair microcapsules to the 20% ethanol solution is 1:(50-60). The steel wire rope is placed in the impregnation solution and impregnated at 5 MPa high pressure and 60°C for 20 minutes. After impregnation, it is cured at 80-100°C for 6 hours.

7. The steel wire rope according to claim 1, characterized in that: The preparation method of the phase change lubricating fiber bundle comprises: VO2 powder was dispersed in 60℃ molten paraffin with a mass ratio of VO2 to paraffin of 1:5, and ultrasonic treatment was performed for 20 minutes to make the VO2 dispersion greater than 95% to obtain the core material. Gelatin and gum arabic were dissolved in 50℃ pure water at a mass ratio of 2:1, and a dialdehyde starch crosslinker of 15% of the mass of gelatin was added. The pH was adjusted to 4.0-4.5, and the mixture was reacted at 60℃ for 1 hour to form a composite wall material solution. The core material and the wall material were mixed at a mass ratio of 1:3, sheared and emulsified at 8000 rpm in a high-speed disperser for 10 minutes, cooled to 10℃ to solidify the wall material, and filtered and dried to obtain microcapsules with a particle size of 50-100μm. Microcapsules and ultra-high molecular weight polyethylene (UHMWPE) chopped fibers were dispersed in a DMAc solvent at a mass ratio of 30:70, and 0.5 wt% of antioxidant 1010 was added to obtain a spinning solution. The spinning solution was extruded through a spinneret with a pore size of 0.15 mm into a coagulation bath with a volume ratio of DMAc to water of 1:4 and a drawing rate of 15 m / min to obtain a precursor. The precursor was first washed with pure water at 20°C for 10 h, then washed with water containing 0.1 wt% of penetrant JFC at 40°C for 12 h, and finally washed with soft water at 60°C for 8 h to obtain a wet tow. The wet yarn bundle was pre-dried by a hot roller at 60°C to reduce the moisture content to 30%, and was drawn at a draft ratio of 3.5:

1. It was irradiated with a dose of 80 kGy under nitrogen protection to solidify the wet yarn bundle to obtain a fiber bundle. The fiber bundle was twisted on a stranding machine with a twist length of 39.0 mm, and then shaped in a hot air circulation oven at 70°C for 30 minutes. The tension was controlled at 0.5 cN / dtex to obtain a phase change lubricated fiber bundle.

8. The steel wire rope according to any one of claims 1 to 7, characterized in that: The preparation method of the steel wire rope comprises: S1. Steel wire reinforcement A 5mm diameter smooth steel wire was drawn multiple times to a diameter of 1.12mm. The drawn steel wire was immediately passed through a PECVD device, where 50sccm of acetylene gas was introduced and a negative bias of 1000V was applied to deposit a 0.5μm diamond-like carbon film. A 3μm ZnO-Al2O3 composite ceramic layer was then deposited using a Zn / Al target at a power of 5kW to obtain a central steel wire. S2. Rope Manufacturing With an aluminum-based carbon fiber composite core as the center, a four-layer structure with gradient functional layers is twisted in layers on the outer layer: Inner layer: 6 S1 reinforced central steel wires, with a right-hand twist of 21-30mm, wrapped around the outer periphery of the aluminum-based carbon fiber composite core; Middle layer: 12 concave steel wires, with a left-hand lay of 35-45mm, wrapped around the outer periphery of the inner layer center wire; Outer layer: 18 convex steel wires, with a right-hand lay of 50-60mm, wrapped around the outer periphery of the concave steel wires in the middle layer; Surface layer: 12 phase change lubricated fiber bundles, with a twist pitch of 70-80mm and left-hand twist, wrapped around the outer convex steel wire; The tension of each layer is controlled during twisting: 80-100cN for the center wire, 70-90cN for the concave wire, and 60-80cN for the convex wire. The tension of the phase change lubricated fiber bundle matches the overall twisting requirements of the strand, and finally merges to form a strand. S3.Multiple twisting The six strands obtained by S2 are synchronously fed into the rope closing machine through the distribution drum, and the ropes are closed in a right-hand alternating lay mode with a lay pitch of 180.0 mm, a pulling speed of 1.8 m / min, and a twisting speed of 10.0 RPM to form sub-rope; the three sub-ropes are closed in a left-hand alternating lay mode with a lay pitch of 344.0 mm, a pulling speed of 1.8 m / min, and a twisting speed of 5.2 RPM to form a steel wire rope; then, the surface of the steel wire rope is impregnated to form a self-repairing sealing layer, electrophoretic deposition is performed to form an interface bonding layer, and electrostatic spraying of an anti-wear coating is performed to obtain a finished steel wire rope.

Images