Steel wire rope composite rope core and production method thereof

Abstract

According to the steel wire rope composite rope core and the production method thereof, a composite structure composed of the composite core yarn and the outer layer core yarn is adopted, the composite core yarn is formed by weaving the sisal fiber yarn and the jute fiber yarn which have high oil storage performance in a staggered mode, and therefore the composite core yarn has certain strength and toughness, and meanwhile the manufacturing cost is reduced; meanwhile, the outer-layer core wire comprises an outer-layer steel wire layer consisting of outer-layer steel wires and a modified fiber layer consisting of modified PP fiber yarns; the overall strength and tensile strength of the composite rope core are improved by arranging the outer steel wire layer, and the PP fibers with low cost, the PE-based carbon fibers, the polymer polyethylene particles and the graphene are subjected to melt blending to obtain the modified PP fibers, so that the cost is further reduced while the tensile strength of the PP fibers is improved; therefore, the overall tensile capacity and strength of the composite rope core are effectively guaranteed; in addition, by arranging the fiber net layer and the steel wire net layer, the inner core wire structure can be fastened, core wires are prevented from loosening, and the strength of the composite rope core is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of water wire rope cores, in particular to a composite wire rope core and a production method thereof. Background Art

[0002] The wire rope core is the core supporting component in the internal structure of the wire rope, which plays a key role in internal support and load bearing. According to the different materials, the rope core can be divided into two categories: metal rope core and fiber rope core. Since the metal rope core has high strength but poor flexibility, and the fiber rope core has good flexibility but lacks sufficient strength, a large number of composite rope cores made of mixed braids of metal wires and fiber wires have appeared.

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

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

[0005] In view of the technical problems in the prior art that the steel wire rope core has high cost and high requirements for its mechanical properties, the present invention provides a steel wire rope composite core with high mechanical properties and low cost.

[0006] A composite rope core of a steel wire rope comprises a composite core wire and an outer core wire spirally twisted outside the composite core wire; the composite core wire comprises a steel core and a plurality of sisal fiber wires and jute fiber wires staggeredly twisted outside the steel core; the outer core wire comprises an outer steel wire layer composed of a plurality of outer steel wires spirally twisted outside the composite core wire and a modified fiber layer composed of a plurality of modified PP fiber wires spirally twisted outside the outer steel wire layer; the modified PP fiber wire is composed of 100 parts of PP fiber, 22-25 parts of high molecular polyethylene particles, 15-20 parts of PE-based carbon fiber, and 0.04-0.14 parts of graphene by weight percentage, and is made by melt blending; a fiber mesh layer is further provided between the composite core wire and the outer steel wire layer; and the composite core wire and the fiber mesh layer are both impregnated with lubricating grease; a steel mesh layer is provided outside the outer steel wire layer, and water-blocking yarn is filled between the steel mesh layer and the outer steel wire layer.

[0007] Preferably, the fiber mesh layer is woven by warp and weft of jute fiber threads, and a plurality of suture threads are provided on the fiber mesh layer, and the suture threads are made of aramid fibers.

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

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

[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 filament is 2-3 times that of the cross-sectional diameter of the outer steel wire.

[0011] The present invention also provides a method for producing a composite core of a steel wire rope, which is applicable to a steel wire rope core as described above, comprising: step S1, preparation of composite core yarn: selecting a steel core, jute silk thread and sisal silk thread, and soaking the jute silk thread and the sisal silk thread in a sodium chloride solution of 50°C-70°C for 6-10 hours respectively, then dehydrating and then adding clean water to boil for 4 hours, taking out and washing, dehydrating and drying; selecting jute silk thread and sisal silk thread of the same number of strands in the dried silk thread, interlacing and twisting them on the outside of the steel core to make the composite core yarn; step S2, preparation of modified PP fiber yarn: selecting 100 parts of PP fiber, 22-25 parts of high molecular polyethylene particles, 15-20 parts of PE-based carbon fiber and 0 .04-0.14 parts of graphene are ground and mixed, and then melt blended to form filaments, and several strands of filaments are selected and woven to form modified PP fiber filaments; Step S3, preparation of fiber layer: aramid thread made of jute thread and aramid fiber prepared in step S1 is selected, and the jute thread is woven in a staggered manner along the warp and weft directions to form a fiber mesh layer; the prepared fiber mesh layer uses the aramid thread to pass several suture lines on the fiber layer; Step S4, preparation of composite rope core: S41: Adhesive is applied to the outer surface of the composite core wire, and the fiber layer is adhered to the outer layer of the composite core wire for curing, and then placed in an oil tank after curing, and immersed at 100°C for 2-2.5h to form a composite core wire and a fiber mesh layer impregnated with lubricating grease;

[0012] S42: Select a number of galvanized steel wires, and twist the galvanized steel wires 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 yarns 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 mesh layer, and fix the steel mesh layer outside the modified fiber layer to obtain a composite rope core.

[0013] Preferably, the step S2 is specifically as follows: step S21: selecting 100 parts of PP fiber, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fiber and 0.04-0.14 parts of graphene according to weight percentage; step S22: soaking the PP fiber and the PE-based carbon fiber in anhydrous ethanol for 10±0.5h respectively, taking them out and washing and drying them with deionized water to constant weight to obtain cleaned PP fiber and PE-based carbon fiber; step S23: placing the high molecular weight polyethylene particles and the cleaned ones in a pulverizer for pulverization and then feeding them into a grinder for grinding, and then grinding the high molecular weight polyethylene particles, PP fiber and PE-based carbon fiber. E-based carbon fiber is put 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 by the screw of a twin-screw extruder to obtain a modified PP fiber masterbatch; step S26: the modified PP fiber masterbatch is melted into a molten spinning solution, the molten spinning solution is spun through a spinning device to form filaments, 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 30-50 min; in step S25, the drying temperature is 80-120°C, and the drying time is 6-14 h; in S26, the melting temperature is 140-220°C.

[0015] Preferably, the polymer polyethylene particles are prepared by uniformly mixing polymer polyethylene, a lubricant, an antioxidant, and a light stabilizer, adding the mixture into an extruder for melt blending, and then extruding and granulating.

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

[0017] The beneficial effects of the present invention are as follows: the present invention provides a composite rope core of a steel wire rope, which adopts a composite structure composed of a composite core wire and an outer core wire, wherein the composite core wire is formed by interlacing sisal fiber wires and jute fiber wires with high oil storage capacity, so that the composite core wire has certain strength and toughness while reducing the manufacturing cost; at the same time, the outer core wire comprises an outer steel wire layer composed of outer steel wires and a modified fiber layer composed of modified PP fiber wires; the overall strength and tensile strength of the composite rope core are improved by setting the outer steel wire layer, and the modified PP fiber is obtained by melt-blending the low-cost PP fiber with PE-based carbon fiber, polymer polyethylene particles and graphene, thereby further reducing the cost while improving the tensile strength of the PP fiber, thereby effectively ensuring the overall tensile strength and strength of the composite rope core; in addition, by setting the fiber mesh layer and the steel mesh layer, the internal core wire structure can be tightened to prevent the core wire from loosening, further improving the strength of the composite rope core, and the water-blocking yarn is set to effectively block moisture, oxygen and other corrosive substances from invading the interior of the rope core, thereby 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 a composite rope core of a steel wire rope. The preparation process of the composite rope core is simple and easy to implement, and has strong applicability. The produced composite rope core of the steel wire rope has low manufacturing cost, good tensile performance, and good commercial value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a composite rope core of a steel wire rope provided by the present invention;

[0020] Figure 2 A schematic flow chart of a method for producing a composite core of a steel wire rope provided by the present invention.

[0021] Figure ID

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

[0023] To further describe the present invention in detail, the following is an explanation with reference to the accompanying drawings. It is particularly noted that the embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

[0025] Specifically, the composite core yarn 1 includes a steel core 3 and a plurality of sisal fiber yarns 4 and jute fiber yarns 5 which are twisted and wrapped around the outer side of the steel core 3 in an alternating manner.

[0026] The steel core 3 in the composite core wire 1 provides strong tensile strength, while the sisal fiber filaments 4 and jute fiber filaments 5 interlaced and twisted on the outside of the steel core 3 can increase the flexibility and corrosion resistance of the rope core. This structure enables the rope core to better disperse stress when subjected to external force and avoid breakage caused by stress concentration. Sisal fiber filaments have natural oil storage properties and can absorb and retain a certain amount of lubricating grease. Hemp fiber filaments are lower in cost than other fiber filaments, but they also have certain strength and wear resistance. Using jute fiber filaments in the composite core wire can reduce the overall cost while maintaining the basic performance of the rope core.

[0027] Improvement of comprehensive 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 wire 2 includes an outer steel wire layer composed of a plurality of outer steel wires 6 spirally twisted on the outside of the composite core wire 1 and a modified fiber layer composed of a plurality of modified PP fiber filaments 7 spirally twisted on the outside of the outer steel wire layer. The outer steel wire layer is composed of a plurality of outer steel wires 6, has high strength and toughness, can withstand large external forces, and provides solid support and protection for the entire rope core. The modified fiber layer composed of the 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 of PP fiber, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fiber, and 0.04-0.14 parts of graphene, and is made by melt blending.

[0030] The modified PP fiber filament 7 is obtained by melt blending the low-cost PP fiber with PE-based carbon fiber, high-molecular polyethylene particles and graphene. Compared with other high-strength fibers, the manufacturing cost is lower and the tensile strength of the original PP fiber is improved, so that the overall tensile strength and strength of the manufactured composite rope core meet the requirements. The process of preparing the modified PP fiber filament 7 by melt blending is relatively simple and easy to control, which is conducive to improving production efficiency and reducing time cost.

[0031] The cavities formed by the adjacent jute fiber strands 5 and sisal fiber strands 4 are each provided with a guide filling cotton core 8 for introducing lubricating grease.

[0032] The diversion filling cotton core 8 can be used as an introduction channel for lubricating grease, and can use its oil absorption to inject new lubricating grease, ensuring that the grease can be evenly distributed in the cavity between the jute fiber filaments 5 and the sisal fiber filaments 4, thereby improving the lubrication performance of the rope core as a whole, making the steel wire rope smoother during use. The diversion filling cotton core 8 can also fix the position of the jute fiber filaments 5 and the sisal fiber filaments 4, improve the density of the composite core filaments 1, and prevent them from displacement or deformation when subjected to external forces.

[0033] A fiber mesh layer 9 is further provided between the composite core wire 1 and the outer steel wire layer; the fiber mesh layer 9 is woven by warp and weft of jute fiber threads, and a plurality of sutures are passed through the fiber mesh layer 9, and the sutures are made of aramid fibers.

[0034] The fiber mesh layer serves as a transition layer between the composite core wire and the outer steel wire layer, and is tightly attached to the outside of the composite core wire 1, which not only improves the stability of the entire structure, but also helps to disperse and resist external stress; and the jute fiber itself has certain strength and toughness. Suturing with sutures 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] The composite core wire 1 and the fiber mesh layer 9 are both saturated with lubricating grease to lubricate each core wire of the composite rope core and each strand of the steel wire rope made of the composite rope core, thereby reducing friction between strands.

[0036] A steel wire mesh layer 10 is provided outside the outer steel wire layer, and a water-blocking yarn 11 is filled between the steel wire mesh layer 10 and the outer steel wire layer. By providing the fiber mesh layer 9 and the steel wire mesh layer 10, the internal core wire structure can be tightened to prevent the core wire from loosening, and the strength of the composite rope core can be further improved. The water-blocking yarn 11 effectively blocks moisture, oxygen and other corrosive substances from invading the interior of the rope core, improves the corrosion resistance of the composite rope core, and ensures the stability of the tensile strength of the composite rope core.

[0037] The composite rope core further comprises a plurality of filling steel wires 12 , which are arranged in the gap between the water-blocking yarn 11 and the outer core wire 2 , and each filling steel wire 12 is tangent to the outer wall of the adjacent outer core wire 2 .

[0038] The filling steel wire 12 is arranged 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 is beneficial to improving the compression and tension resistance 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 steel wire rope core, which is applicable to a steel wire rope core as described above, comprising:

[0041] Step S1, preparation of composite core yarn 1: select steel core 3, jute silk thread and sisal silk thread, and soak the jute silk thread and sisal silk thread in 50℃-70℃ sodium chloride solution for 6-10h respectively, then dehydrate and add clean water to steam for 4h, take out and wash, dehydrate and dry; select jute silk thread and sisal silk thread of the same number of strands in the dried silk thread, and interlace and twist them on the outside of the steel core 3 to make composite core yarn 1.

[0042] After the jute and sisal threads are immersed in sodium chloride solution respectively, and then dehydrated and steamed, it is helpful to clean the surface of the jute and sisal threads, improve their surface smoothness and flexibility, and open the pores on the surface of the fiber threads, so that the subsequent fiber threads can better absorb and release lubricating grease, and evenly lubricate the surface of each core wire of the rope core. The steel core 3, as the core part of the composite core wire 1, provides a certain tensile strength. The interlaced twisting of the jute and sisal threads further enhances the shear resistance and torsion resistance of the composite core wire 1.

[0043] Step S2, preparation of modified PP fiber filaments 7: 100 parts of PP fiber, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fiber and 0.04-0.14 parts of graphene are selected by weight percentage, ground and mixed, and then melt blended to form filaments, and a plurality of filaments are selected and woven to form modified PP fiber filaments 7. By weaving a plurality of filaments made by melt blending into the modified PP fiber filaments 7, the tensile strength of the modified PP fiber filaments 7 is further improved.

[0044] Wherein, the step S2 is specifically as follows:

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

[0046] Step S22: After soaking the PP fiber and the PE-based carbon fiber in anhydrous ethanol for 10±0.5 hours, the PP fiber and the PE-based carbon fiber are taken out and washed and dried with deionized water to constant weight to obtain cleaned PP fiber and PE-based carbon fiber. By soaking the PP fiber and the PE-based carbon fiber in anhydrous ethanol, washing and drying, the impurities and oil stains on the surface are effectively removed, and the purity and subsequent processing performance of the material are improved.

[0047] Step S23: Place the high molecular polyethylene particles and the washed ones in a pulverizer for pulverization and then feed them into a grinder for grinding, then put the ground high molecular polyethylene particles, PP fibers and PE-based carbon fibers into a mixing device for high-speed stirring to obtain a first raw material mixture. Step S24: Gradually add graphene to the first raw material mixture, perform high-speed stirring and ultrasonic oscillation, so that the graphene is dispersed in the first raw material mixture to obtain a second raw material mixture.

[0048] The high molecular weight polyethylene particles, PP fibers and PE-based carbon fibers are crushed and ground before being stirred at high speed for the first time, ensuring uniform mixing of the components. At the same time, by gradually adding graphene and performing a second high-speed stirring and ultrasonic oscillation, the graphene is evenly dispersed in the mixture, avoiding the occurrence of agglomeration. Combining two mechanical stirring and ultrasonic oscillations can ensure that the components are fully mixed, which is conducive to improving the subsequent production quality and efficiency.

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

[0050] The drying process removes the moisture and volatile substances in the second mixture, ensuring the smooth progress of subsequent extrusion granulation. The twin-screw extruder can realize an efficient and continuous extrusion granulation process and improve production efficiency.

[0051] Step S26: Melting the modified PP fiber masterbatch into a molten spinning solution, spinning the molten spinning solution through a spinning device to form filaments, and weaving the filaments to obtain the modified PP fiber filaments 7.

[0052] The process of preparing the modified PP fiber filament 7 by melt blending is relatively simple and easy to control, and can realize continuous production, which is beneficial to improving production efficiency and reducing production cost and time cost.

[0053] The addition of high molecular weight polyethylene particles improves the strength and toughness of PP fibers, while PE-based carbon fibers can enhance the rigidity and wear resistance of PP fibers. The trace addition of graphene can not only act as a lubricant, but also significantly improve the strength and toughness of PP fibers, and can give modified PP fibers antibacterial and anti-aging properties. 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 form modified PP fibers, the tensile strength of PP fibers is significantly improved, and the low-cost but low-strength PP fibers are modified into fibers suitable for the manufacture of steel wire rope cores, significantly reducing production costs.

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

[0055] Table 1: PP fiber tensile performance test data table when PE-based carbon fiber / polymer polyethylene / graphene is used in some dosages

[0056]

[0057] As can be seen from Table 1, the tensile strength of the modified PP fiber 7 obtained by modifying the PP fiber with different amounts of PE-based carbon fiber, polymer polyethylene and graphene is significantly improved compared with that of the PP fiber made of ordinary PP fiber. The reason is that the addition of PE-based carbon fiber, polymer polyethylene and graphene improves the strength and toughness of the PP fiber, achieves a reinforcement effect, and makes the modified PP fiber 7 have 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 30-50 min; in step S25, the drying temperature is 80-120°C, and the drying time is 6-14 h; in S26, the melting temperature is 140-220°C.

[0059] Preferably, the polymer polyethylene particles are prepared by uniformly mixing polymer polyethylene, a lubricant, an antioxidant and a light stabilizer, adding the mixture into an extruder for melt blending and then extruding and granulating.

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

[0061] The addition of antioxidants can capture and neutralize the free radicals of high molecular polyethylene, preventing the free radicals from initiating a chain reaction that causes the polyethylene molecular chain to break, thereby extending the service life of the product. Light stabilizers can absorb or reflect ultraviolet rays, prevent ultraviolet rays from damaging high molecular polyethylene, and maintain the color and gloss of the product. Through the melt blending extrusion granulation process, the tensile strength, impact strength and other properties of high molecular polyethylene particles are stabilized, and have good strength and toughness.

[0062] Step S3, preparation of fiber layer: select jute thread prepared in step S1 and aramid thread made of aramid fiber, and weave the jute thread in a staggered and overlapping manner along the warp and weft directions to form a fiber mesh layer 9; the prepared fiber mesh layer 9 uses the aramid thread to pass a plurality of suture lines on the fiber layer.

[0063] Step S4, preparation of composite rope core: comprising

[0064] Step S41: Coat the outer surface of the composite core wire 1 with adhesive, adhere the fiber layer to the outer layer of the composite core wire 1 for curing, and then put it into an oil tank after curing, and immerse it at 100°C for 2-2.5 hours to form a composite core wire 1 and a fiber mesh layer 9 impregnated with lubricating grease. Coat the outer surface of the composite core wire 1 with adhesive, and ensure that the adhesive is evenly distributed so that the fiber mesh layer 9 can adhere tightly to the composite core wire 1. Put the composite core wire 1 and the fiber mesh layer 9 into the oil tank as a whole, and immerse them at 100°C for 2-2.5 hours so that they can fully absorb the lubricating grease, thereby improving their wear resistance and lubrication performance.

[0065] Step S42: Select a number of galvanized steel wires and twist the galvanized steel wires on the outside of the fiber mesh layer 9 in 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 on the outside of the outer steel wire layer in a preset arrangement to form a modified fiber layer. The modified PP fiber filaments 7 have better tensile strength and strength after modification, which can further enhance the strength of the composite rope core.

[0067] Step S45: Use galvanized steel wire to weave a steel mesh layer 10, and fix the steel mesh layer 10 outside the modified fiber layer to obtain a composite rope core. Fix the steel mesh layer 10 outside the modified fiber layer to ensure that the steel mesh layer and the modified fiber layer are tightly combined, effectively prevent the internal core wire from loosening, and improve the stability of the overall structure.

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

[0069] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention, and do not limit the invention to the specific implementation methods described. Obviously, other modifications and changes can be made according to the content of this specification. The embodiments selected and specifically described in this specification are to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. It is not a limitation of the present invention. Any simple deformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A composite steel wire rope core, comprising a composite core wire and an outer core wire spirally twisted outside the composite core wire; characterized in that: The composite core wire comprises a steel core and a plurality of sisal fiber wires and jute fiber wires twisted alternately on the outside of the steel core; the outer core wire comprises an outer steel wire layer composed of a plurality of outer steel wires twisted helically on the outside of the composite core wire and a modified fiber layer composed of a plurality of modified PP fiber wires twisted helically on the outside of the outer steel wire layer; The modified PP fiber yarn is composed of the following weight percentages: 100 parts of PP fiber, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fiber, and 0.04-0.14 parts of graphene, and is prepared by melt blending; A fiber mesh layer is also provided between the composite core wire and the outer steel wire layer; and the composite core wire and the fiber mesh layer are both soaked and coated with lubricating grease; A steel wire mesh layer is arranged outside the outer steel wire layer, and water-blocking yarn is filled between the steel wire mesh layer and the outer steel wire layer.

2. A composite steel wire rope core according to claim 1, characterized in that: The fiber mesh layer is woven by warp and weft of jute fiber threads, and a plurality of suture threads are arranged on the fiber mesh layer, and the suture threads are made of aramid fibers.

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

4. A composite steel wire rope core according to claim 1, characterized in that: A diversion filling cotton core for introducing lubricating grease is arranged in the cavity formed by the adjacent jute fiber strands and sisal fiber strands.

5. The composite steel wire rope core 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 filament is 2-3 times that of the cross-sectional diameter of the outer steel wire.

6. A method for producing a composite steel wire rope core, which is applicable to a steel wire rope core as claimed in any one of claims 1 to 5, characterized in that: include: Step S1, preparation of composite core yarn: steel core, jute silk thread and sisal silk thread are selected, and the jute silk thread and the sisal silk thread are respectively soaked in a sodium chloride solution of 50°C-70°C for 6-10 hours, then dehydrated and then added with clean water for steaming for 4 hours, taken out and washed, dehydrated and dried; jute silk thread and sisal silk thread of the same number of strands are selected from the dried silk threads and interlaced and twisted on the outside of the steel core to make a composite core yarn; Step S2, preparation of modified PP fiber filaments: 100 parts of PP fiber, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fiber and 0.04-0.14 parts of graphene are selected by weight percentage, ground and mixed, and then melt blended to form filaments, and a plurality of filaments are selected and woven to form modified PP fiber filaments; Step S3, preparation of the fiber layer: selecting the jute thread prepared in step S1 and the aramid thread made of aramid fiber, and weaving the jute thread in a staggered manner along the warp and weft directions to form a fiber mesh layer; the prepared fiber mesh layer uses the aramid thread to pass through a plurality of suture lines on the fiber layer; Step S4, preparation of a composite rope core: S41: coating an adhesive on the outer surface of the composite core wire, and adhering a fiber layer to the outer layer of the composite core wire for curing, and then placing it in an oil tank after curing, and immersing it at 100°C for 2-2.5 hours to form a composite core wire and a fiber mesh layer impregnated with lubricating grease; S42: selecting a number of galvanized steel wires, and twisting the galvanized steel wires on the outside of the fiber mesh layer in a preset arrangement to form an outer steel wire layer; S43: selecting the modified PP fiber yarn prepared in step S2 and twisting it on the outside of the outer steel wire layer in a preset arrangement to form a modified fiber layer; S45: selecting galvanized steel wires to weave a steel mesh layer, and fixing the steel mesh layer on the outside of the modified fiber layer to obtain a composite rope core.

7. The method for producing a composite steel wire rope core according to claim 6, characterized in that: The step S2 is specifically as follows: Step S21: selecting 100 parts of PP fibers, 22-25 parts of high molecular weight polyethylene particles, 15-20 parts of PE-based carbon fibers, and 0.04-0.14 parts of graphene according to weight percentage; Step S22: After soaking the PP fiber and the PE-based carbon fiber in anhydrous ethanol for 10±0.5 hours respectively, taking them out and washing them with deionized water and drying them to constant weight to obtain washed PP fiber and PE-based carbon fiber; Step S23: placing the high molecular weight polyethylene particles and the washed particles in a pulverizer for pulverization and then feeding them into a grinder for grinding, and then feeding the ground high molecular weight polyethylene particles, PP fibers and PE-based carbon fibers into a mixing device for high-speed stirring to obtain a first raw material mixture; Step S24: gradually adding graphene to the first raw material mixture, performing high-speed stirring and ultrasonic oscillation, so that the graphene is dispersed in the first raw material mixture, to obtain a second raw material mixture; Step S25: sending the second raw material mixture into a drying device for drying, and the dried mixture is extruded and granulated through the screw of a twin-screw extruder to obtain a modified PP fiber masterbatch; Step S26: Melting the modified PP fiber masterbatch into a molten spinning solution, spinning the molten spinning solution through a spinning device to form filaments, and weaving the filaments to obtain the modified PP fiber filaments.

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

9. The method for producing a composite steel wire rope core according to claim 6, characterized in that: The high molecular polyethylene particles are prepared by uniformly mixing high molecular polyethylene, a lubricant, an antioxidant and a light stabilizer, adding the mixture into an extruder for melt blending and then extruding and granulating.

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

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