A composite core for steel wire rope and its manufacturing method

Abstract

This invention provides a composite core for steel wire rope and its manufacturing method. It employs a composite structure consisting of a composite core wire and an outer core wire. The composite core wire is made of sisal and jute fibers interwoven, which have high oil storage capacity, giving the composite core wire a certain strength and toughness while reducing manufacturing costs. The outer core wire comprises an outer steel wire layer and a modified fiber layer composed of modified PP fibers. The outer steel wire layer improves the overall strength and tensile strength of the composite core. Modified PP fibers are obtained by melt-blending low-cost PP fibers with PE-based carbon fibers, high-molecular-weight polyethylene particles, and graphene, further reducing costs while improving the tensile strength of the PP fibers, thus effectively ensuring the overall tensile strength and strength of the composite core. Furthermore, the fiber mesh layer and steel wire mesh layer secure the internal core wire structure, preventing the core wires from loosening and further enhancing the strength of the composite core.

Description

Technical Field

[0001] This invention relates to the field of steel wire rope core technology, and in particular to a composite steel wire rope core and its production method. Background Technology

[0002] The core of a wire rope is the core supporting component within its internal structure, playing a crucial role in internal support and load bearing. Based on the material, cores can be broadly classified into metal cores and fiber cores. Because metal cores offer high strength but poor flexibility, while fiber cores offer excellent flexibility but lack sufficient strength, composite cores made from a mixture of metal and fiber filaments have become increasingly common.

[0003] However, the high-strength, high-tensile-strength fibers commonly used in composite rope cores include aramid, carbon fiber, and other modified fibers. Although the properties of these fibers meet the requirements for rope core manufacturing and can produce composite rope cores with the required strength and tensile properties, the cost of purchasing these fibers is relatively high, which greatly increases the production cost of rope cores and reduces production efficiency.

[0004] Therefore, in order to control production costs and ensure the mechanical properties of the wire rope core, it is necessary to provide a wire rope core that is low in cost and has good strength and tensile strength. Summary of the Invention

[0005] To address the technical problems of high cost and high mechanical performance requirements of existing wire rope cores, this invention provides a composite wire rope core with high mechanical performance and low cost.

[0006] A composite core for steel wire rope includes a composite core wire and an outer core wire spirally twisted around the composite core wire. The composite core wire includes a steel core and several sisal and jute fibers interlaced around the outside of the steel core. The outer core wire includes an outer steel wire layer composed of several outer steel wires spirally twisted around the outside of the composite core wire and a modified fiber layer composed of several modified PP fibers spirally twisted around the outside of the outer steel wire layer. The modified PP fibers are composed of the following weight percentages: 100 parts PP fiber, 22-25 parts high molecular weight polyethylene granules, 15-20 parts PE-based carbon fiber, and 0.04-0.14 parts graphene, produced by melt blending. A fiber mesh layer is also provided between the composite core wire and the outer steel wire layer. Both the composite core wire and the fiber mesh layer are impregnated with lubricating grease. A steel wire mesh layer is provided outside the outer steel wire layer, and water-resistant yarn is filled between the steel wire mesh layer and the outer steel wire layer.

[0007] Preferably, the fiber web is woven from jute fiber threads, and a number of stitching lines are threaded through the fiber web, the stitching lines being made of aramid fiber.

[0008] Preferably, it further includes a plurality of filler wires, which are disposed in the gap between the water-blocking yarn and the outer core yarn, and each filler wire is tangent to the outer wall of the adjacent outer core yarn.

[0009] Preferably, each cavity formed by adjacent jute and sisal fibers is provided with a guide filling cotton core for introducing lubricating grease.

[0010] Preferably, the twist direction of the outer steel wire layer is opposite to that of the modified fiber layer, and the cross-sectional diameter of the modified PP fiber is 2-3 times that of the outer steel wire.

[0011] This invention also provides a method for producing a composite core for steel wire rope, applicable to a steel wire rope core as described above, comprising: Step S1, preparation of composite core wire: selecting a steel core, jute thread, and sisal thread, and soaking the jute thread and sisal thread separately in a sodium chloride solution at 50℃-70℃ for 6-10 hours, then dehydrating them and adding water to boil for 4 hours, removing them, washing, dehydrating, and drying them; selecting jute thread and sisal thread of the same number of strands to intertwine around the outside of the steel core to form a composite core wire; Step S2, preparation of modified PP fiber filament: selecting 100 parts by weight of PP fiber, 22-25 parts by weight of high molecular weight polyethylene granules, 15-20 parts by weight of PE-based carbon fiber, and 0 parts by weight of modified PP fiber filament. 0.04-0.14 parts of graphene are ground, mixed, and then melt-blended to form filaments. Several strands of the filaments are selected and woven into modified PP fiber filaments. Step S3: Preparation of fiber layer: Aramid filaments made from jute filaments and aramid fibers prepared in step S1 are selected and the jute filaments are interlaced and woven along the warp and weft directions to form a fiber web layer. Several stitches are threaded through the fiber web layer using the aramid filaments. Step S4: Preparation of composite rope core: S41: An adhesive is coated on the outer surface of the composite core filament, and the fiber layer is adhered to the outer layer of the composite core filament for curing. After curing, it is placed in an oil bath and immersed at 100°C for 2-2.5 hours to form a composite core filament and fiber web layer coated with lubricating grease.

[0012] S42: Select several galvanized steel wires and twist them on the outside of the fiber mesh layer in a preset arrangement to form an outer steel wire layer; S43: Select the modified PP fiber filaments prepared in step S2 and twist them on the outside of the outer steel wire layer in a preset arrangement to form a modified fiber layer; S45: Select galvanized steel wires to weave a steel wire mesh layer and fix the steel wire mesh layer on the outside of the modified fiber layer to obtain a composite rope core.

[0013] Preferably, step S2 specifically comprises: Step S21: Selecting 100 parts by weight of PP fiber, 22-25 parts by weight of high molecular weight polyethylene granules, 15-20 parts by weight of PE-based carbon fiber, and 0.04-0.14 parts by weight of graphene; Step S22: Soaking PP fiber and PE-based carbon fiber separately in anhydrous ethanol for 10±0.5h, then removing them and washing them with deionized water until constant weight is obtained, to obtain cleaned PP fiber and PE-based carbon fiber; Step S23: Placing the high molecular weight polyethylene granules and the cleaned PP fiber separately in a pulverizer for pulverization, and then feeding them into a grinding mill for further grinding, and then combining the ground high molecular weight polyethylene granules, PP fiber, and PE-based carbon fiber... E-based carbon fiber is fed into a mixing device and stirred at high speed to obtain a first raw material mixture; Step S24: Graphene is gradually added to the first raw material mixture, and high-speed stirring and ultrasonic oscillation are performed to disperse the graphene in the first raw material mixture to obtain a second raw material mixture; Step S25: The second raw material mixture is sent to a drying device for drying treatment, and the dried mixture is extruded and granulated through the screw of a twin-screw extruder to obtain modified PP fiber masterbatch; Step S26: The modified PP fiber masterbatch is melted into a molten spinning solution, and the molten spinning solution is spun into filaments through a spinning device, and the filaments are woven to obtain the modified PP fiber filaments.

[0014] Preferably, in step S23, the high-speed stirring time is 50-60 min, the grinding rate of the grinder is 160-260 r / min, and the grinding time is 4-6 h; in step S24, the ultrasonic oscillation and high-speed stirring time are both 30-50 min; in step S25, the drying temperature is 80-120℃, and the drying time is 6-14 h; in step S26, the melting temperature is 140-220℃.

[0015] Preferably, the high molecular weight polyethylene granules are made by uniformly mixing high molecular weight polyethylene with lubricant, antioxidant and light stabilizer, adding the mixture to an extruder for melt blending and then extruding and granulating.

[0016] Preferably, the amount of lubricant added is 1%-3% of the mass of the added polyethylene, the amount of antioxidant added is 0.1%-0.3% of the mass of the added polyethylene, and the amount of light stabilizer added is 0.1%-0.3% of the mass of the added polyethylene.

[0017] The beneficial effects of this invention are as follows: This invention provides a composite core for steel wire rope, which adopts a composite structure composed of a composite core wire and an outer core wire. The composite core wire is made of sisal fiber and jute fiber interwoven with high oil storage capacity, which gives the composite core wire a certain strength and toughness while reducing manufacturing costs. At the same time, the outer core wire includes an outer steel wire layer composed of an outer steel wire and a modified fiber layer composed of modified PP fiber. By setting the outer steel wire layer, the overall strength and tensile strength of the composite rope core are improved. Modified PP fiber is obtained by melt blending low-cost PP fiber with PE-based carbon fiber, high molecular weight polyethylene particles and graphene, which improves the tensile strength of PP fiber and further reduces costs, thereby effectively ensuring the overall tensile strength and strength of the composite rope core. In addition, the fiber mesh layer and steel wire mesh layer can tighten the internal core wire structure, prevent the core wire from loosening, further improve the strength of the composite rope core, and the water-blocking yarn effectively prevents moisture, oxygen and other corrosive substances from penetrating into the rope core, improving the corrosion resistance of the composite rope core and ensuring the stability of the tensile strength of the composite rope core.

[0018] The present invention also provides a method for producing composite wire rope cores. The preparation process of the composite wire rope core is simple and easy to implement, has strong applicability, and the manufactured composite wire rope core has low manufacturing cost and good tensile properties, thus possessing good commercial value. Attached Figure Description

[0019] Figure 1 This invention provides a structural schematic diagram of a composite wire rope core.

[0020] Figure 2 This is a schematic flowchart of a method for producing composite wire rope cores according to the present invention.

[0021] Attached Figure Labels

[0022] 1. Composite core yarn; 2. Outer core yarn; 3. Steel core; 4. Sisal fiber yarn; 5. Jute fiber yarn; 6. Outer steel wire; 7. Modified PP fiber yarn; 8. Flow-guiding filling cotton core; 9. Fiber mesh layer; 10. Steel wire mesh layer; 11. Water-blocking yarn; 12. Filling steel wire. Detailed Implementation

[0023] To provide a more detailed description of the present invention, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] refer to Figure 1As shown, a composite core of a steel wire rope includes a composite core wire 1 and an outer core wire 2 spirally twisted around the composite core wire 1.

[0025] Specifically, the composite core filament 1 includes a steel core 3 and a plurality of sisal fiber filaments 4 and jute fiber filaments 5 interlaced and twisted around the outside of the steel core 3.

[0026] The steel core 3 in the composite core filament 1 provides strong tensile strength, while the sisal fiber 4 and jute fiber 5, intertwined on the outside of the steel core 3, increase the flexibility and corrosion resistance of the rope core. This structure allows the rope core to better distribute stress when subjected to external forces, avoiding breakage caused by stress concentration. Sisal fiber has natural oil-retaining properties, capable of absorbing and retaining a certain amount of lubricating grease. Hemp fiber is relatively inexpensive compared to other fibers, yet still possesses a certain level of strength and abrasion resistance. Using jute fiber in the composite core filament reduces overall cost while maintaining the basic properties of the rope core.

[0027] Improved overall performance: By combining the advantages of steel core, sisal fiber and jute fiber, the composite rope core achieves effective cost control while maintaining high strength and stability.

[0028] The outer core filament 2 comprises an outer steel wire layer consisting of several outer steel wires 6 spirally twisted around the outside of the composite core filament 1, and a modified fiber layer consisting of several modified PP fiber filaments 7 spirally twisted around the outside of the outer steel wire layer. The outer steel wire layer, composed of several outer steel wires 6, possesses high strength and toughness, capable of withstanding significant external forces, providing robust support and protection for the entire rope core. The modified fiber layer, composed of modified PP fiber filaments 7, ensures the flexibility of the composite rope core.

[0029] Specifically, the modified PP fiber filament 7 is composed of the following weight percentages: 100 parts PP fiber, 22-25 parts high molecular weight polyethylene particles, 15-20 parts PE-based carbon fiber, and 0.04-0.14 parts graphene, which are produced by melt blending.

[0030] Modified PP fiber filament 7 is obtained by melt blending low-cost PP fibers with PE-based carbon fibers, high-molecular-weight polyethylene particles, and graphene. This method has a lower manufacturing cost compared to other high-strength fibers and improves the tensile strength of the original PP fibers, resulting in composite rope cores with overall tensile strength and performance meeting requirements. The melt blending method for preparing modified PP fiber filament 7 is relatively simple and easy to control, which helps improve production efficiency and reduce time costs.

[0031] Each cavity formed by adjacent jute fiber 5 and sisal fiber 4 is provided with a guide filling cotton core 8 for introducing lubricating grease.

[0032] The flow-guiding filling core 8 serves as a channel for introducing lubricating grease, utilizing its oil-absorbing properties to inject new lubricating grease. This ensures that the grease is evenly distributed in the cavity between the jute fiber 5 and the sisal fiber 4, thereby improving the overall lubrication performance of the rope core and making the wire rope run more smoothly during use. The flow-guiding filling core 8 also fixes the position of the jute fiber 5 and the sisal fiber 4, increasing the density of the composite core wire 1 and preventing them from shifting or deforming under external forces.

[0033] A fiber mesh layer 9 is also provided between the composite core wire 1 and the outer steel wire layer; the fiber mesh layer 9 is woven from jute fiber threads, and several stitching lines are threaded on the fiber mesh layer 9, the stitching lines being made of aramid fiber.

[0034] The fiber mesh layer serves as a transition layer between the composite core wire and the outer steel wire layer, and is closely attached to the outside of the composite core wire 1. This not only improves the stability of the entire structure but also helps to disperse and resist external stress. Furthermore, jute fibers themselves have a certain strength and toughness, and sewing them together with stitching thread can further enhance the strength of the fiber mesh layer 9, thereby improving the tensile strength and shear resistance of the entire steel wire rope core.

[0035] Both the composite core wire 1 and the fiber mesh layer 9 are impregnated with lubricating grease to lubricate each core wire of the composite rope core and to lubricate each strand of the wire rope made from the composite rope core, thereby reducing inter-strand friction.

[0036] A wire mesh layer 10 is provided on the outer side of the outer wire layer, and water-blocking yarn 11 is filled between the wire mesh layer 10 and the outer wire layer. By setting the fiber mesh layer 9 and the wire mesh layer 10, the internal core wire structure can be tightened, preventing the core wire from loosening and further improving the strength of the composite rope core. The water-blocking yarn 11 effectively blocks moisture, oxygen and other corrosive substances from penetrating into the rope core, improving the corrosion resistance of the composite rope core and ensuring the stability of the tensile strength of the composite rope core.

[0037] The composite rope core also includes several filler steel wires 12, which are disposed in the gap between the water-blocking yarn 11 and the outer core yarn 2, and each filler steel wire 12 is tangent to the outer wall of the adjacent outer core yarn 2.

[0038] The filler wire 12 is placed in the gap between the water-blocking yarn 11 and the outer core wire 2, which effectively increases the density of the composite rope core, provides good support for the rope core, enhances the overall structural strength and stability of the rope core, and helps to improve the compressive and tensile strength of the composite rope core.

[0039] In this embodiment, the twist direction of the outer steel wire layer is opposite to that of the modified fiber layer, and the cross-sectional diameter of the modified PP fiber filament 7 is 2-3 times the cross-sectional diameter of the outer steel wire 6.

[0040] refer to Figure 2 As shown, the present invention also provides a method for producing a composite wire rope core, which is applicable to a wire rope core as described above, comprising:

[0041] Step S1, Preparation of composite core wire 1: Select steel core 3, jute silk and sisal silk, and soak the jute silk and sisal silk in sodium chloride solution at 50℃-70℃ for 6-10 hours, then dehydrate and add water to boil for 4 hours. Take out, wash, dehydrate and dry; select jute silk and sisal silk of the same number of strands to intertwine and wrap around the outside of the steel core 3 to make composite core wire 1.

[0042] Soaking jute and sisal fibers separately in a sodium chloride solution, followed by dehydration and steaming, helps clean the surfaces of the fibers, improving their smoothness and flexibility. It also opens the pores on the fiber surfaces, allowing subsequent fibers to better absorb and release lubricating grease, thus evenly lubricating the surfaces of each core fiber in the rope core. The steel core 3, as the core component of the composite core filament 1, provides a certain tensile strength. The interlacing of the jute and sisal fibers further enhances the shear and torsional resistance of the composite core filament 1.

[0043] Step S2, Preparation of modified PP fiber filament 7: 100 parts by weight of PP fiber, 22-25 parts by weight of high-molecular-weight polyethylene granules, 15-20 parts by weight of PE-based carbon fiber, and 0.04-0.14 parts by weight of graphene are selected, ground, mixed, and then melt-blended to form filaments. Several strands of these filaments are then braided to form modified PP fiber filament 7. By weaving the melt-blended filaments into the modified PP fiber filament 7, the tensile strength of the modified PP fiber filament 7 is further improved.

[0044] Specifically, step S2 is as follows:

[0045] Step S21: Select 100 parts by weight of PP fiber, 22-25 parts by weight of high molecular weight polyethylene granules, 15-20 parts by weight of PE-based carbon fiber, and 0.04-0.14 parts by weight of graphene. In this embodiment, 100 parts by weight of PP fiber, 23 parts by weight of high molecular weight polyethylene granules, 17 parts by weight of PE-based carbon fiber, and 0.08 parts by weight of graphene are selected.

[0046] Step S22: PP fibers and PE-based carbon fibers are soaked in anhydrous ethanol for 10 ± 0.5 h, then removed, washed with deionized water, and dried to constant weight to obtain cleaned PP fibers and PE-based carbon fibers. Soaking and washing the PP fibers and PE-based carbon fibers in anhydrous ethanol effectively removes surface impurities and oil, improving the purity and subsequent processing performance of the materials.

[0047] Step S23: The high-molecular-weight polyethylene granules and the cleaned granules are placed in a pulverizer for pulverization, and then fed into a grinding mill for further grinding. The ground high-molecular-weight polyethylene granules, PP fibers, and PE-based carbon fibers are then added to a mixing device and subjected to high-speed stirring to obtain a first raw material mixture. Step S24: Graphene is gradually added to the first raw material mixture, and high-speed stirring and ultrasonic oscillation are performed to disperse the graphene in the first raw material mixture, resulting in a second raw material mixture.

[0048] After crushing and grinding, high-molecular-weight polyethylene particles, PP fibers, and PE-based carbon fibers are subjected to a first high-speed stirring process to ensure uniform mixing of the components. Simultaneously, by gradually adding graphene and performing a second high-speed stirring and ultrasonic oscillation, uniform dispersion of graphene in the mixture is achieved, preventing agglomeration. The combination of two mechanical stirring processes and ultrasonic oscillation ensures thorough mixing of the components, which is beneficial for improving subsequent production quality and efficiency.

[0049] Step S25: The second raw material mixture is fed into a drying device for drying. The dried mixture is then extruded and granulated through the screw of a twin-screw extruder to obtain modified PP fiber masterbatch.

[0050] The drying process removes moisture and volatile substances from the second mixture, ensuring smooth subsequent extrusion granulation. The twin-screw extruder enables a highly efficient and continuous extrusion granulation process, improving production efficiency.

[0051] Step S26: The modified PP fiber masterbatch is melted into a molten spinning solution, the molten spinning solution is spun into filaments through a spinning device, and the filaments are woven to obtain the modified PP fiber filament 7.

[0052] The process of preparing modified PP fiber filaments 7 by melt blending is relatively simple and easy to control, and can achieve continuous production, which is conducive to improving production efficiency and reducing production costs and time costs.

[0053] The addition of high-molecular-weight polyethylene particles improves the strength and toughness of PP fibers, while PE-based carbon fibers enhance their rigidity and wear resistance. The trace addition of graphene not only acts as a lubricant but also significantly improves the strength and toughness of PP fibers, and imparts antibacterial and anti-aging properties to the modified PP fiber filaments. By mixing PP fibers, high-molecular-weight polyethylene particles, PE-based carbon fibers, and graphene in a certain proportion and then melt-blending them to produce modified PP fibers, the tensile strength of PP fibers is significantly improved. This allows for the modification of low-cost but low-strength PP fibers into fibers suitable for steel wire rope core manufacturing, significantly reducing production costs.

[0054] Specifically, tensile properties were tested on modified PP fiber filaments 7 obtained by modifying PP fibers with different amounts of PE-based carbon fiber, high molecular weight polyethylene, and graphene, and on PP fiber filaments made from ordinary PP fibers. The test results are shown in Table 1 below.

[0055] Table 1: Tensile property test data of PP fiber with PE-based carbon fiber / polyethylene / graphene content

[0056]

[0057] As shown in Table 1, the modified PP fiber filament 7 obtained by modifying PP fiber with different amounts of PE-based carbon fiber, high molecular weight polyethylene, and graphene has a significantly higher tensile strength than PP fiber filament made from ordinary PP fiber. This is because the addition of PE-based carbon fiber, high molecular weight polyethylene, and graphene improves the strength and toughness of PP fiber filament, achieving a reinforcing effect, and giving modified PP fiber filament 7 good tensile strength.

[0058] Preferably, in step S23, the high-speed stirring time is 50-60 min, the grinding rate of the grinder is 160-260 r / min, and the grinding time is 4-6 h; in step S24, the ultrasonic oscillation and high-speed stirring time are both 30-50 min; in step S25, the drying temperature is 80-120℃, and the drying time is 6-14 h; in step S26, the melting temperature is 140-220℃.

[0059] Preferably, the high molecular weight polyethylene granules are made by uniformly mixing high molecular weight polyethylene with lubricant, antioxidant and light stabilizer, adding the mixture to an extruder for melt blending and then extruding and granulating.

[0060] The lubricant is added at 1%-3% of the mass of the polyethylene, the antioxidant is added at 0.1%-0.3% of the mass of the polyethylene, and the light stabilizer is added at 0.1%-0.3% of the mass of the polyethylene.

[0061] The addition of antioxidants can capture and neutralize free radicals in high-molecular-weight polyethylene (HMWPE), preventing free radicals from initiating chain reactions that break the polyethylene molecular chains, thereby extending the product's lifespan. Light stabilizers can absorb or reflect ultraviolet (UV) rays, preventing their damaging effects on HMWPE and maintaining the product's color and gloss. Through melt blending extrusion granulation, the tensile strength, impact strength, and other properties of HMWPE granules are stabilized, resulting in good strength and toughness.

[0062] Step S3, Preparation of fiber layer: Select the jute filaments and aramid fibers prepared in step S1 to make aramid filaments, and weave the jute filaments in an alternating pattern along the warp and weft directions to form fiber web layer 9; the fiber web layer 9 is made by threading several stitches through the aramid filaments.

[0063] Step S4, Preparation of the composite rope core: including

[0064] Step S41: Apply adhesive to the outer surface of the composite core wire 1, and adhere the fiber layer to the outer layer of the composite core wire 1 for curing. After curing, place it in an oil bath and immerse it at 100°C for 2-2.5 hours to form a composite core wire 1 and fiber web layer 9 impregnated with lubricating grease. Apply adhesive to the outer surface of the composite core wire 1, ensuring uniform distribution so that the fiber web layer 9 can adhere tightly to the composite core wire 1. Place the composite core wire 1 and fiber web layer 9 together in an oil bath and immerse them at 100°C for 2-2.5 hours to allow them to fully absorb the lubricating grease, thereby improving their wear resistance and lubrication performance.

[0065] Step S42: Select several galvanized steel wires and twist them onto the outside of the fiber mesh layer 9 according to a preset arrangement to form an outer steel wire layer. The outer steel wire layer provides additional strength and support for the composite rope core.

[0066] Step S43: The modified PP fiber filaments 7 prepared in step S2 are twisted onto the outside of the outer steel wire layer according to a preset arrangement to form a modified fiber layer. The modified PP fiber filaments 7 have better tensile strength and can further enhance the strength of the composite rope core after modification treatment.

[0067] Step S45: Select galvanized steel wire to weave the wire mesh layer 10, and fix the wire mesh layer 10 outside the modified fiber layer to obtain the composite rope core. Fixing the wire mesh layer 10 outside the modified fiber layer ensures that the wire mesh layer and the modified fiber layer are tightly bonded, effectively preventing the internal core wires from loosening and improving the stability of the overall structure.

[0068] The present invention also provides a method for producing composite wire rope cores. The preparation process of the composite wire rope core is simple and easy to implement, has strong applicability, and the manufactured composite wire rope core has low manufacturing cost and good tensile properties, thus possessing good commercial value.

[0069] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention and do not limit the invention to the specific implementations described. Obviously, other modifications and variations can be made based on the content of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. They are not intended to limit the invention, and any simple modifications to the invention fall within the scope of protection of this invention.

Claims

1. A composite core for steel wire rope, comprising a composite core wire and an outer core wire spirally twisted around the composite core wire; characterized in that, The composite core filament includes a steel core and several sisal and jute fibers interlaced around the outside of the steel core; the outer core filament includes an outer steel wire layer composed of several outer steel wires spirally twisted around the outside of the composite core filament and a modified fiber layer composed of several modified PP fibers spirally twisted around the outside of the outer steel wire layer. The modified PP fiber filament is composed of the following weight percentages: 100 parts PP fiber, 22-25 parts high molecular weight polyethylene particles, 15-20 parts PE-based carbon fiber, and 0.04-0.14 parts graphene, prepared by melt blending. A fiber mesh layer is also provided between the composite core wire and the outer steel wire layer; and both the composite core wire and the fiber mesh layer are impregnated with lubricating grease. A wire mesh layer is provided on the outside of the outer wire layer, and water-resistant yarn is filled between the wire mesh layer and the outer wire layer. The method for producing the composite core of the steel wire rope includes: Step S1, Preparation of composite core wire: Select steel core, jute thread and sisal thread, and soak the jute thread and sisal thread in sodium chloride solution at 50℃-70℃ for 6-10 hours, then dehydrate and add water to boil for 4 hours. Take out, wash, dehydrate and dry; select jute thread and sisal thread of the same number of strands to intertwine and wrap around the outside of the steel core to make composite core wire; Step S2, Preparation of modified PP fiber filaments: Select 100 parts by weight of PP fiber, 22-25 parts by weight of high molecular weight polyethylene particles, 15-20 parts by weight of PE-based carbon fiber and 0.04-0.14 parts by weight of graphene, grind and mix them, and then use the melt blending method to make filaments. Select several strands of filaments to weave into modified PP fiber filaments. Step S3, Preparation of the fiber layer: Select the jute filaments and aramid fibers prepared in step S1 to make aramid filaments, and weave the jute filaments in an alternating pattern along the warp and weft directions to form a fiber web layer; the fiber web layer is made by threading several stitches through the aramid filaments on the fiber layer; Step S4, Preparation of Composite Rope Core: S41: Coat the outer surface of the composite core wire with adhesive, and adhere the fiber layer to the outer layer of the composite core wire for curing. After curing, place it in an oil bath and immerse it at 100℃ for 2-2.5 hours to form a composite core wire and fiber web layer coated with lubricating grease; S42: Select several galvanized steel wires and twist them on the outside of the fiber web layer according to a preset arrangement to form an outer steel wire layer; S43: Select the modified PP fiber filaments prepared in step S2 and twist them on the outside of the outer steel wire layer according to a preset arrangement to form a modified fiber layer; S45: Select galvanized steel wire to weave a steel wire mesh layer and fix the steel wire mesh layer on the outside of the modified fiber layer to obtain the composite rope core.

2. The composite core of a steel wire rope according to claim 1, characterized in that, The fiber web is woven from jute fiber threads, and several stitching lines are threaded through the fiber web, the stitching lines being made of aramid fiber.

3. The composite core of a steel wire rope according to claim 1, characterized in that, It also includes several filler wires, which are disposed in the gap between the water-blocking yarn and the outer core yarn, and each filler wire is tangent to the outer wall of the adjacent outer core yarn.

4. The composite core of a steel wire rope according to claim 1, characterized in that, Each cavity formed by adjacent jute and sisal fibers is equipped with a guide filling cotton core for introducing lubricating grease.

5. The composite core of a steel wire rope according to claim 1, characterized in that, The twist direction of the outer steel wire layer is opposite to that of the modified fiber layer, and the cross-sectional diameter of the modified PP fiber is 2-3 times that of the outer steel wire.

6. A method for producing a composite wire rope core, applicable to a wire rope core as described in any one of claims 1-5, characterized in that, Step S2 specifically involves: Step S21: Select 100 parts PP fiber, 22-25 parts high molecular weight polyethylene granules, 15-20 parts PE-based carbon fiber and 0.04-0.14 parts graphene by weight percentage; Step S22: Soak PP fiber and PE-based carbon fiber in anhydrous ethanol for 10±0.5h, then take them out, wash them with deionized water and dry them to constant weight to obtain cleaned PP fiber and PE-based carbon fiber. Step S23: The high molecular weight polyethylene particles and the cleaned materials are placed in a crusher for crushing and then fed into a grinder for grinding. The ground high molecular weight polyethylene particles, PP fibers and PE-based carbon fibers are then put into a mixing device and stirred at high speed to obtain the first raw material mixture. Step S24: Graphene is gradually added to the first raw material mixture, and high-speed stirring and ultrasonic oscillation are performed to disperse the graphene in the first raw material mixture, thereby obtaining the second raw material mixture; Step S25: The second raw material mixture is fed into a drying device for drying. The dried mixture is then extruded and granulated through the screw of a twin-screw extruder to obtain modified PP fiber masterbatch. Step S26: The modified PP fiber masterbatch is melted into a molten spinning solution, the molten spinning solution is spun into filaments by a spinning device, and the filaments are woven into the modified PP fiber filaments.

7. The method for producing a composite core of steel wire rope according to claim 6, characterized in that, In step S23, the high-speed stirring time is 50-60 min, the grinding speed of the grinder is 160-260 r / min, and the grinding time is 4-6 h; in step S24, the ultrasonic oscillation and high-speed stirring time are both 30-50 min; in step S25, the drying temperature is 80-120℃, and the drying time is 6-14 h; in step S26, the melting temperature is 140-220℃.

8. The method for producing a composite core of steel wire rope according to claim 6, characterized in that, The high molecular weight polyethylene granules are made by uniformly mixing high molecular weight polyethylene with lubricant, antioxidant and light stabilizer, adding it to an extruder for melt blending and then extruding and granulating.

9. A method for producing a composite core of steel wire rope according to claim 8, characterized in that, The amount of lubricant added is 1%-3% of the mass of the added polyethylene; the amount of antioxidant added is 0.1%-0.3% of the mass of the added polyethylene; and the amount of light stabilizer added is 0.1%-0.3% of the mass of the added polyethylene.

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