A composite core for steel wire rope and its preparation method

Abstract

The application provides a steel wire rope composite core, the outer layer wire is spirally twisted with the center wire, the center wire comprises a plurality of steel wires and a plurality of sisal wires, one of the sisal wires is arranged in the center twisted with the steel wires, and the rest of the sisal wires are arranged in the gap between the two steel wires in turn; the outer layer wire comprises a plurality of modified ultra-high molecular weight polyethylene yarns, and a protective sleeve is further arranged outside the outer layer wire. The center wire and the outer layer wire cooperate to make the steel wire rope core have high strength and flexibility, and the cooperation of the steel wires also has high support.

Description

Technical Field

[0001] This invention relates to the field of wire rope core technology, specifically to a composite wire rope core and its preparation method. Background Technology

[0002] Wire rope is a helical bundle of steel wires twisted together according to specific rules, meeting mechanical properties and geometric dimensions. It consists of steel wires, a core, and lubricating grease. Wire ropes are characterized by high strength, light weight, stable operation, and resistance to sudden breakage, making them reliable and widely used in daily life. Due to their unique properties, wire ropes remain indispensable materials or components in metallurgy, mining, oil and gas drilling, machinery, chemical industry, and aerospace. The wire rope core, as one of the main structural components, plays an irreplaceable role. It supports the strands to maintain a certain cross-sectional shape, reduces contact stress and extrusion deformation between the wires, increases flexibility, stores lubricating oil, prevents corrosion of the wires, and reduces friction between the wires. As the application conditions of wire ropes become increasingly diverse, the requirements for the wire rope core also increase. For example, wire ropes need high tensile strength during lifting to prevent breakage; and they need flexibility when winding around machinery to prevent derailment. To make the wire rope suitable for various working conditions, a composite structure of fiber and steel wire is adopted. High-molecular-weight fiber is used as one of the internal raw materials of the rope core, ensuring both internal support and improved strength while maintaining flexibility. This enhances the overall performance of the wire rope core. Summary of the Invention

[0003] The purpose of this invention is to provide a composite wire rope core and its preparation method, which effectively improves the overall performance of the core, not only providing good support capacity but also enhancing the tensile strength and flexibility of the core. The preparation method is simple and easy to implement.

[0004] This invention provides a composite core for steel wire rope, comprising a central filament and an outer layer filament. The outer layer filament is spirally twisted around the central filament. The central filament comprises several steel wires and several sisal filaments, wherein one sisal filament is positioned at the center of the intertwined steel wires, and the remaining sisal filaments are sequentially positioned in the gaps between pairs of steel wires. The outer layer filament comprises several modified ultra-high molecular weight polyethylene yarns, and a protective sheath is provided on the outer layer filament. The modified ultra-high molecular weight polyethylene yarns are prepared by modifying γ-aminopropyltriethoxysilane and graphene oxide, and the modification steps are as follows: Step 1: Take mineral oil, ultra-high molecular weight polyethylene fiber and antioxidant in a certain proportion and mix them evenly to obtain an ultra-high molecular weight polyethylene fiber solution with a concentration of 1%-3%. Add the ultra-high molecular weight polyethylene fiber solution to a twin-screw extruder and extrude it after high-temperature swelling and dissolution. Then, it is quenched in a cooling water bath to form ultra-high molecular weight polyethylene gel filaments. Step 2: Dissolve γ-aminopropyltriethoxysilane in dichloromethane to prepare a composite extract with a mass fraction of 1%. Disperse graphene oxide in methanol and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a mass concentration of 5 g / L. Step 3: First, the ultra-high molecular weight polyethylene gel fiber is subjected to a first ultrasonic extraction with dichloromethane solution, and then the ultra-high molecular weight polyethylene gel fiber is subjected to a second ultrasonic extraction with the composite extraction solution. The extraction time is 8 minutes for both extractions. The extracted ultra-high molecular weight polyethylene gel fiber is then stretched and wound onto a paper tube and dried at room temperature under ventilation. Finally, the ultra-high molecular weight polyethylene gel fiber is thermally stretched to obtain γ-aminopropyltriethoxysilane modified ultra-high molecular weight polyethylene fiber. Step 4: Spray the graphene oxide dispersion onto the γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filament at a spray bath ratio of 1:50, and then dry it in an oven at 60°C to obtain modified ultra-high molecular weight polyethylene filament. Perform drawing, roving, spinning and plying processes on the modified ultra-high molecular weight polyethylene filament to obtain the modified ultra-high molecular weight polyethylene yarn.

[0005] Preferably, the protective sleeve is a polypropylene-jute fiber protective sleeve.

[0006] More preferably, the manufacturing steps of the polypropylene-jute fiber protective sleeve are as follows: First, the jute fiber is cleaned and purified for later use; then, the polypropylene granules and jute fiber are dried at 60°C for 25 hours; then, the polypropylene granules and jute fiber are mixed in a mixer at a ratio of 100:2, the mixing temperature is 185°C, the rotation speed is 10 r / m, and the mixing time is 12 hours; then, the uniformly mixed polypropylene-jute fiber eutectic is extruded through an extruder to obtain a polypropylene-jute fiber sheet; finally, the polypropylene-jute fiber sheet is hot-pressed onto the outer surface of the outer filament to obtain the polypropylene-jute fiber protective sleeve.

[0007] Preferably, the mineral oil in step one is white oil, and the antioxidant is antioxidant 1076.

[0008] Preferably, in step three, the ratio of dichloromethane to ultra-high molecular weight polyethylene gel fibers in the first ultrasonic extraction is 20:1.

[0009] Preferably, the ratio of the composite extract liquid to the ultra-high molecular weight polyethylene gel fiber in the second ultrasonic extraction step three is 25:1.

[0010] Preferably, in step three, the hot stretching involves stretching ultra-high molecular weight polyethylene gel filaments sequentially at 80, 100, and 110°C by 15, 2, and 1.3 times, respectively, to obtain γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filaments.

[0011] Preferably, grease is filled between the central wire and the protective sleeve.

[0012] This invention also provides a method for preparing a composite core for steel wire ropes, which includes the following steps: Step 1: Carbon steel is drawn into carbon steel wire of a predetermined diameter using a wire drawing machine. The carbon steel wire is then subjected to phosphate treatment to obtain the steel wire. The weight of the phosphate film on the surface of the steel wire is 13-16 g / m. 2 ; Step 2: Arrange the oil-impregnated sisal filaments and the steel wires on the twisting machine through the splitter. With one sisal filament as the center, twist several steel wires around the sisal filament in a spiral. The remaining sisal filaments are twisted into the gaps between adjacent steel wires to obtain the center filament. Step 3: Take a number of modified ultra-high molecular weight polyethylene yarns, and spirally twist the modified ultra-high molecular weight polyethylene yarns around the center yarn using a twisting machine. Apply oil to the closed end to obtain the outer layer yarn. Step 4: Take a number of polypropylene-jute fiber sheets and cut them into appropriate sizes. Use hot pressing to wrap the outer filaments with the polypropylene-jute fiber sheets. After cooling and solidification, the protective sleeve is obtained. The protective sleeve is polished smooth to obtain the steel wire rope composite core.

[0013] The present invention has the following beneficial effects: By setting a double-layer structure of central filament and outer filament, the present invention uses steel wire as the main material to provide effective support for the core of the steel wire rope. Sisal filaments are placed between the steel wires to lubricate them and reduce steel wire wear. The outer filament is made of modified ultra-high molecular weight polyethylene yarn. The modification of ultra-high molecular weight polyethylene fiber with γ-aminopropyltriethoxysilane and graphene oxide allows graphene oxide to form a protective film on the outer surface of the fiber, improving the fiber's wear resistance, reducing frictional wear of the modified ultra-high molecular weight polyethylene yarn, and reducing the impact of broken filaments on the steel wire rope. The combination of central filament and outer filament gives the steel wire rope core high strength and flexibility, and together with the steel wire, it also provides high support. γ-aminopropyltriethoxysilane was introduced into the surface of ultra-high molecular weight polyethylene (UHMWPE) fibers using a gel fiber extraction modification method, thereby giving the fiber surface active -NH2 groups. Then, graphene oxide dispersion was sprayed to graft graphene oxide onto the fiber surface, thus constructing a relatively strong graphene oxide layer on the UHMWPE fiber surface. The UHMWPE fiber treated with γ-aminopropyltriethoxysilane has a tighter bond with the graphene oxide coating, and the graphene oxide coating is not easy to fall off during friction, thus effectively protecting the UHMWPE fiber.

[0014] The present invention also provides a method for preparing the high-strength steel wire rope core. The preparation process of the core is simple and easy to implement, has strong applicability, and produces a steel wire rope core with superior performance and broad development prospects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a high-strength steel wire rope core according to the present invention.

[0016] In the diagram: 1-center wire, 2-outer wire, 3-protective sleeve, 4-lubricant, 101-steel wire, 102-sisal wire. Detailed Implementation

[0017] 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. Example 1

[0018] like Figure 1As shown, this embodiment provides a composite core for a steel wire rope, comprising a central wire 1 and an outer layer wire 2. The outer layer wire 2 is spirally twisted around the central wire 1. The central wire 1 comprises several steel wires 101 and several sisal filaments 102, wherein one sisal filament 102 is located at the center of the intertwined steel wires 101, and the remaining sisal filaments 102 are sequentially arranged in the gaps between pairs of steel wires 101. That is, with one sisal filament 102 as the center, the steel wires 101 are spirally twisted around the sisal filament 102, and then the remaining sisal filaments 102 are arranged in the gaps between adjacent steel wires 101. The outer layer wire 2 comprises several modified ultra-high molecular weight polyethylene yarns, and a protective sleeve 3 is also provided outside the outer layer wire 2. Lubricating grease 4 is filled between the central wire 1 and the protective sleeve 3. The modified ultra-high molecular weight polyethylene yarns are made by modifying γ-aminopropyltriethoxysilane and graphene oxide, and the modification steps are as follows: Step 1: Mix white oil, ultra-high molecular weight polyethylene fiber and antioxidant 1076 in a certain proportion to obtain an ultra-high molecular weight polyethylene fiber solution with a concentration of 1%. Add the ultra-high molecular weight polyethylene fiber solution to a twin-screw extruder. After high-temperature swelling and dissolution, the solution is extruded and then rapidly cooled in a cooling water bath to form ultra-high molecular weight polyethylene gel filaments. Step 2: Dissolve γ-aminopropyltriethoxysilane in dichloromethane to prepare a composite extract with a mass fraction of 1%. Disperse graphene oxide in methanol and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a mass concentration of 5 g / L. Step 3: First, the ultra-high molecular weight polyethylene (UHMWPE) gel fibers are subjected to a first ultrasonic extraction using a dichloromethane solution. The ratio of dichloromethane to UHMWPE gel fibers in the first ultrasonic extraction is 20:1. Then, the UHMWPE gel fibers are subjected to a second ultrasonic extraction using the composite extractant. The ratio of the composite extractant to UHMWPE gel fibers in the second ultrasonic extraction is 25:1, and the extraction time is 8 minutes for both extractions. The extracted UHMWPE gel fibers are then tightly wound onto a paper tube and dried at room temperature under ventilation. Finally, the UHMWPE gel fibers are stretched sequentially at 80, 100, and 110 °C by 15, 2, and 1.3 times, respectively, to obtain γ-aminopropyltriethoxysilane-modified UHMWPE fibers. Step 4: Spray the graphene oxide dispersion onto the γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filament at a spray bath ratio of 1:50, and then dry it in an oven at 60°C to obtain modified ultra-high molecular weight polyethylene filament. Perform drawing, roving, spinning and plying processes on the modified ultra-high molecular weight polyethylene filament to obtain the modified ultra-high molecular weight polyethylene yarn.

[0019] The protective sleeve is made of polypropylene-jute fiber. By setting up the protective sleeve, the internal structure of the rope core can be stabilized, and the support effect of the rope core can be improved.

[0020] The manufacturing steps of the polypropylene-jute fiber protective sleeve are as follows: First, the jute fiber is cleaned and purified for later use. Polypropylene granules and jute fiber are dried at 60°C for 25 hours. Then, the polypropylene granules and jute fiber are mixed in a 100:2 ratio in a mixer at 185°C and 10 rpm for 12 hours. The uniformly mixed polypropylene-jute fiber eutectic is then extruded through an extruder to obtain a polypropylene-jute fiber sheet. Finally, the polypropylene-jute fiber sheet is hot-pressed onto the outer surface of the outer filament to obtain the polypropylene-jute fiber protective sleeve. Preferably, as shown in the embodiment, the jute fiber can be pretreated with a silane coupling agent to improve the compatibility between the jute fiber and the polypropylene matrix. Using jute fiber as the reinforcement and polypropylene resin as the matrix can effectively improve the physical properties of the polypropylene resin matrix and increase its tensile strength. Example 2

[0021] Example 2 provides a composite core for steel wire rope. Compared with Example 1, the core structure of Example 2 is the same, but the difference is that the modified ultra-high molecular weight polyethylene yarn is made by modifying γ-aminopropyltriethoxysilane and graphene oxide. The modification steps are as follows: Step 1: Mix white oil, ultra-high molecular weight polyethylene fiber and antioxidant 1076 in a certain proportion to obtain an ultra-high molecular weight polyethylene fiber solution with a concentration of 2%. Add the ultra-high molecular weight polyethylene fiber solution to a twin-screw extruder. After high-temperature swelling and dissolution, the solution is extruded and then rapidly cooled in a cooling water bath to form ultra-high molecular weight polyethylene gel filaments. Step 2: Dissolve γ-aminopropyltriethoxysilane in dichloromethane to prepare a composite extract with a mass fraction of 1%. Disperse graphene oxide in methanol and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a mass concentration of 5 g / L. Step 3: First, the ultra-high molecular weight polyethylene (UHMWPE) gel fibers are subjected to a first ultrasonic extraction using a dichloromethane solution. The ratio of dichloromethane to UHMWPE gel fibers in the first ultrasonic extraction is 20:1. Then, the UHMWPE gel fibers are subjected to a second ultrasonic extraction using the composite extractant. The ratio of the composite extractant to UHMWPE gel fibers in the second ultrasonic extraction is 25:1, and the extraction time is 8 minutes for both extractions. The extracted UHMWPE gel fibers are then tightly wound onto a paper tube and dried at room temperature under ventilation. Finally, the UHMWPE gel fibers are stretched sequentially at 80, 100, and 110 °C by 15, 2, and 1.3 times, respectively, to obtain γ-aminopropyltriethoxysilane-modified UHMWPE fibers. Step 4: Spray the graphene oxide dispersion onto the γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filament at a spray bath ratio of 1:50, and then dry it in an oven at 60°C to obtain modified ultra-high molecular weight polyethylene filament. Perform drawing, roving, spinning and plying processes on the modified ultra-high molecular weight polyethylene filament to obtain the modified ultra-high molecular weight polyethylene yarn. Example 3

[0022] Example 3 provides a composite core for steel wire rope. Compared with Example 1, the core structure of Example 3 is the same, except that the modified ultra-high molecular weight polyethylene yarn is made by modifying γ-aminopropyltriethoxysilane and graphene oxide. The modification steps are as follows: Step 1: Mix white oil, ultra-high molecular weight polyethylene fiber and antioxidant 1076 in a certain proportion to obtain an ultra-high molecular weight polyethylene fiber solution with a concentration of 3%. Add the ultra-high molecular weight polyethylene fiber solution to a twin-screw extruder. After high-temperature swelling and dissolution, the solution is extruded and then rapidly cooled in a cooling water bath to form ultra-high molecular weight polyethylene gel filaments. Step 2: Dissolve γ-aminopropyltriethoxysilane in dichloromethane to prepare a composite extract with a mass fraction of 1%. Disperse graphene oxide in methanol and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a mass concentration of 5 g / L. Step 3: First, the ultra-high molecular weight polyethylene (UHMWPE) gel fibers are subjected to a first ultrasonic extraction using a dichloromethane solution. The ratio of dichloromethane to UHMWPE gel fibers in the first ultrasonic extraction is 20:1. Then, the UHMWPE gel fibers are subjected to a second ultrasonic extraction using the composite extractant. The ratio of the composite extractant to UHMWPE gel fibers in the second ultrasonic extraction is 25:1, and the extraction time is 8 minutes for both extractions. The extracted UHMWPE gel fibers are then tightly wound onto a paper tube and dried at room temperature under ventilation. Finally, the UHMWPE gel fibers are stretched sequentially at 80, 100, and 110 °C by 15, 2, and 1.3 times, respectively, to obtain γ-aminopropyltriethoxysilane-modified UHMWPE fibers. Step 4: Spray the graphene oxide dispersion onto the γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filament at a spray bath ratio of 1:50, and then dry it in an oven at 60°C to obtain modified ultra-high molecular weight polyethylene filament. Perform drawing, roving, spinning and plying processes on the modified ultra-high molecular weight polyethylene filament to obtain the modified ultra-high molecular weight polyethylene yarn. Example 4

[0023] This embodiment provides a method for preparing a steel wire rope composite core, used to prepare the steel wire rope composite core in Example 1, Example 2, or Example 3. The preparation steps are as follows: Step 1: Carbon steel is drawn into carbon steel wire of a predetermined diameter using a wire drawing machine. The carbon steel wire is then subjected to phosphate treatment to obtain the steel wire. The weight of the phosphate film on the surface of the steel wire is 13-16 g / m. 2 ; Step 2: Arrange the oil-impregnated sisal filaments and the steel wires on the twisting machine through the splitter. With one sisal filament as the center, twist several steel wires around the sisal filament in a spiral. The remaining sisal filaments are twisted into the gaps between adjacent steel wires to obtain the center filament. Step 3: Take a number of modified ultra-high molecular weight polyethylene yarns, and spirally twist the modified ultra-high molecular weight polyethylene yarns around the center yarn using a twisting machine. Apply oil to the closed end to obtain the outer layer yarn. Step 4: Take a number of polypropylene-jute fiber sheets and cut them into appropriate sizes. Use hot pressing to wrap the outer filaments with the polypropylene-jute fiber sheets. After cooling and solidification, the protective sleeve is obtained. The protective sleeve is polished smooth to obtain the steel wire rope composite core. Example 5

[0024] The modified ultra-high molecular weight polyethylene filaments of Examples 1, 2 and 3 above, as well as the unmodified ultra-high molecular weight polyethylene filaments of the same diameter (Comparative Example 1), were subjected to mechanical and abrasion resistance tests. The test results are shown in Table 1 below.

[0025] Table 1

[0026] As shown in Table 1, modifying ultra-high molecular weight polyethylene (UHMWPE) fibers with γ-aminopropyltriethoxysilane and graphene oxide can significantly improve their abrasion resistance. This is because the fiber surface becomes rougher after being treated with γ-aminopropyltriethoxysilane and coated with graphene oxide, resulting in a significantly increased amount of graphene oxide coating. This reduces abrasion in the UHMWPE fibers, while maintaining their original excellent mechanical properties. By improving the abrasion resistance of the outer filaments, the service life of the rope core can be effectively increased, and the probability of filament breakage can be reduced.

[0027] This invention utilizes a rope core with a composite structure comprising a central wire and an outer layer of wires. The central wire is made of steel wire, which enhances both the supporting strength and tensile strength of the rope core. The outer layer of wires is made of modified ultra-high molecular weight polyethylene yarn, which significantly improves the abrasion resistance of the modified ultra-high molecular weight polyethylene yarn while maintaining its excellent mechanical properties. This reduces the probability of wire breakage due to internal friction during use, thereby extending the service life of the rope core. This invention also proposes a method for preparing this steel wire rope composite core, which is simple, easy to operate, and highly applicable.

[0028] The present invention has been described in detail above with reference to the embodiments. It should also be noted that the specific technical features described in the above embodiments can be combined and modified in any suitable manner without contradiction. The present invention will not further describe the various possible combinations. Furthermore, other variations and combinations based on the various technical features of the present invention should also be considered as part of the content disclosed in this invention and fall within the protection scope of this invention.

Claims

1. A composite core for steel wire rope, comprising a center wire and an outer layer wire, characterized in that, The outer layer filament is spirally twisted around the central filament, which comprises several steel wires and several sisal filaments. One sisal filament is positioned at the center of the intertwined steel wires, and the remaining sisal filaments are sequentially positioned in the gaps between pairs of steel wires. The outer layer filament comprises several modified ultra-high molecular weight polyethylene yarns, and a protective sleeve is provided outside the outer layer filament. Lubricating grease is filled between the central filament and the protective sleeve. The protective sleeve is a polypropylene-jute fiber protective sleeve, and the manufacturing steps of the polypropylene-jute fiber protective sleeve are as follows: first, the jute fibers are cleaned and purified for later use; then, polypropylene granules and jute fibers are... The mixture was dried at 60℃ for 25 hours. Then, polypropylene granules and jute fibers were mixed in a mixer at a ratio of 100:2 at 185℃ and 10 r / m for 12 hours. The uniformly mixed polypropylene-jute fiber eutectic was then extruded to obtain a polypropylene-jute fiber sheet. Finally, the polypropylene-jute fiber sheet was hot-pressed onto the outer surface of the outer filament to obtain the polypropylene-jute fiber protective sleeve. The modified ultra-high molecular weight polyethylene yarn was prepared by modification with γ-aminopropyltriethoxysilane and graphene oxide, and the modification steps are as follows: Step 1: Mix mineral oil, ultra-high molecular weight polyethylene fiber, and antioxidant in a certain proportion to obtain an ultra-high molecular weight polyethylene fiber solution with a concentration of 1%-3%. Add the ultra-high molecular weight polyethylene fiber solution to a twin-screw extruder, and after high-temperature swelling and dissolution, extrude it and then quench it in a cooling water bath to form ultra-high molecular weight polyethylene gel filaments. The mineral oil is white oil, and the antioxidant is antioxidant 1076. Step 2: Dissolve γ-aminopropyltriethoxysilane in dichloromethane to prepare a composite extract with a mass fraction of 1%. Disperse graphene oxide in methanol and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a mass concentration of 5 g / L. Step 3: First, the ultra-high molecular weight polyethylene (UHMWPE) gel fiber is subjected to a first ultrasonic extraction using dichloromethane solution, and then a second ultrasonic extraction using the composite extractant. The extraction time for both is 8 minutes. The extracted UHMWPE gel fiber is then tightly wound onto a paper tube and dried at room temperature under ventilation. Then, the UHMWPE gel fiber is thermally stretched to obtain γ-aminopropyltriethoxysilane-modified UHMWPE fibers. In the first ultrasonic extraction, the ratio of dichloromethane to UHMWPE gel fiber is 20:1, and in the second ultrasonic extraction, the ratio of the composite extractant to UHMWPE gel fiber is 25:

1. The thermal stretching involves stretching the UHMWPE gel fiber sequentially at 80, 100, and 110 °C by 15, 2, and 1.3 times, respectively, to obtain γ-aminopropyltriethoxysilane-modified UHMWPE fibers. Step 4: Spray the graphene oxide dispersion onto the γ-aminopropyltriethoxysilane-modified ultra-high molecular weight polyethylene filament at a spray bath ratio of 1:50, and then dry it in an oven at 60°C to obtain modified ultra-high molecular weight polyethylene filament. Perform drawing, roving, spinning and plying processes on the modified ultra-high molecular weight polyethylene filament to obtain the modified ultra-high molecular weight polyethylene yarn.

2. A method for preparing a composite wire rope core, used to prepare the composite wire rope core according to claim 1, characterized in that, Includes the following steps: Step 1: Carbon steel is drawn into carbon steel wire of a predetermined diameter using a wire drawing machine. The carbon steel wire is then subjected to phosphate treatment to obtain the steel wire. The weight of the phosphate film on the surface of the steel wire is 13-16 g / m. 2 ; Step 2: Arrange the oil-impregnated sisal filaments and the steel wires on the twisting machine through the splitter. With one sisal filament as the center, twist several steel wires around the sisal filament in a spiral. The remaining sisal filaments are twisted into the gaps between adjacent steel wires to obtain the center filament. Step 3: Take a number of modified ultra-high molecular weight polyethylene yarns, and spirally twist the modified ultra-high molecular weight polyethylene yarns around the center yarn using a twisting machine. Apply oil to the closed end to obtain the outer layer yarn. Step 4: Take a number of polypropylene-jute fiber sheets and cut them into appropriate sizes. Use hot pressing to wrap the outer filaments with the polypropylene-jute fiber sheets. After cooling and solidification, the protective sleeve is obtained. The protective sleeve is polished smooth to obtain the steel wire rope composite core.

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