High oil content coated metal rope and its preparation method and application

Abstract

This invention belongs to the field of metal rope technology, and provides a high-oil-content coated metal rope, its preparation method, and its application. The coated metal rope includes a metal rope and a plastic outer layer coated on the outer surface of the metal rope. The metal rope includes a core wire containing a first lubricating oil and side wires containing a second lubricating oil, with the side wires wound around the outer surface of the core wire. The flash point of the first lubricating oil is 20°C to 30°C higher than the melting temperature of the plastic outer layer; the flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer. The method of this invention can significantly reduce oil evaporation during the coating process of the plastic outer layer, avoiding bulging, air bubbles, and coating failure. The prepared high-oil-content coated metal rope has good self-lubricating properties, which can significantly reduce internal friction and breakage of the metal rope. It can be applied to the drive mechanism of vehicle sliding doors.

Description

Technical Field

[0001] This application relates to the field of metal rope technology, and in particular to a high oil content coated metal rope, its preparation method and application. Background Technology

[0002] Wire rope is a helical bundle of steel wires that meet specific mechanical properties and geometric dimensions, twisted together according to certain rules. It consists of steel wires, a core, and lubricant. Wire rope is made by first twisting multiple layers of steel wires into strands, and then, with the core as the center, winding a certain number of strands into a helical shape. It is used in material handling machinery for lifting, traction, tensioning, and load-bearing. Wire rope has advantages such as high strength, light weight, smooth operation, resistance to sudden breakage, and reliable operation, and is widely used in daily life.

[0003] In the production process of steel wire rope, oiling is essential, including for phosphated coated steel wire rope, galvanized steel wire rope, stainless steel wire rope, and bright steel wire rope. However, plastic-coated steel wire rope generally does not have grease or only a very small amount of grease. Commercially available coated steel wire ropes typically have a low oil content, generally around 0.3% or none at all. This is because lubricating oil has a low flash point; regardless of the existing coating method used, the molten plastic will vaporize the lubricating oil, and the oil vapor will cause bubbles in the coating layer, leading to coating failure. Furthermore, because coated steel wire ropes have a completely sealed surface, they cannot be lubricated later. If the oil content is low, it cannot effectively cover all the contact surfaces inside the wire rope. When the wire rope is bent extensively or has a small bending radius, insufficient internal lubrication will cause the conductors to wear against each other and break within a short time, failing to meet the expected performance.

[0004] To improve at least one of the performance aspects of wire rope, those skilled in the art have continuously optimized the manufacturing process of wire rope. For example, patent application CN111535061A discloses a high wear-resistant and long-life crane-specific wire rope, including a central core and outer strands. The cross-section of the central core is a regular hexagon or circle. The outer strands consist of six identical strands. Each outer strand specifically includes a central strand, an inner strand, and an outer strand. The inner strand is formed by twisting nine galvanized wires around the central strand, and the outer strand is formed by twisting fifteen galvanized wires. The inner and outer strands have the same twist direction. The inner strand wraps around the central strand, and the outer strand wraps around the inner strand. A filler layer exists between the inner and outer strands. The six outer strands are twisted around the central core. This wire rope is flexible, lightweight, has strong lateral compressive strength, high tensile strength, good wear resistance, fatigue resistance, excellent lubricity, and is not prone to rust. For example, patent application CN116695472A discloses a fire-extinguishing steel wire rope for ship loaders, belonging to the technical field of ship loader steel wire ropes. This fire-extinguishing steel wire rope includes multiple wound steel wire tubes and multiple spray holes drilled in the steel wire tubes. Reinforcing connecting plates are fixedly connected between the multiple steel wire tubes. Flexible liquid storage tubes are installed inside the multiple steel wire tubes. These tubes generate carbon dioxide by fusing hydrochloric acid and sodium bicarbonate powder, reducing nearby oxygen gas. Simultaneously, under the pressure of the steel wire tubes, dry powder is sprayed out, covering a large area of ​​the steel wire rope surface, thus effectively mitigating the spread of fire. The addition of tough connecting rods greatly strengthens the stability of the steel wire rope structure, effectively preventing it from scattering during use. Furthermore, the reinforcing connecting plates connecting two steel wire tubes effectively prevent deformation caused by the high temperatures generated when the steel wire rope encounters fire.

[0005] However, while the aforementioned crane-specific wire ropes, by applying lubricating oil to the outer strands and adding oil reservoirs, do improve wear resistance, they do not effectively demonstrate the impact of the oil content range or the effects of the outer lubrication and oil reservoirs on the wire rope's bending properties. The aforementioned fire-fighting wire ropes, by only filling the tough connecting rods with lubricating oil, only address the issue of improved wear resistance but also fail to prove their positive effect on the wire rope's bending properties. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the present invention provides a high oil content coated metal rope, its preparation method and application, which has a higher oil content than existing metal ropes and a smooth surface and high bending life.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of the present invention provides a high-oil-content coated metal rope, comprising a metal rope and a plastic outer layer coated on the outer surface of the metal rope. The metal rope includes a core wire containing a first lubricating oil and side wires containing a second lubricating oil, the side wires being wound around the outer surface of the core wire.

[0009] The flash point of the first lubricating oil is 20℃~30℃ higher than the melting temperature of the outer plastic layer;

[0010] The flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer.

[0011] According to the above technical means, the core wire containing the first lubricating oil does not directly contact the plastic outer layer, and its heating rate is relatively slow. Therefore, the flash point of the selected first lubricating oil does not need to be too high compared to the melting temperature of the plastic outer layer. On the other hand, the side wire containing the second lubricating oil directly contacts the plastic outer layer and its heating rate is fast. Therefore, the flash point of the selected second lubricating oil is significantly higher than the melting temperature of the plastic outer layer, thereby preventing local temperature rise during the coating of the plastic outer layer, which would result in a high evaporation rate of the first and second lubricating oils.

[0012] Furthermore, the oil content of the coated metal rope is ≥1.5%.

[0013] Based on the above technical means, the oil content of the coated metal rope in this application is significantly higher than that of the existing coated metal rope. The oil in the coated metal rope can uniformly lubricate the internal gaps of the metal rope. During the coating process of the plastic outer layer, the high oil content can avoid the generation of air bubbles during coating, and the surface of the plastic outer layer is smooth.

[0014] Furthermore, the plastic coating material selected for the outer plastic layer includes Nylon-11 with a melting temperature of 150℃~280℃.

[0015] Furthermore, the bending life of the coated metal rope is ≥200,000 cycles.

[0016] Based on the above-mentioned technical means, the coated metal rope of this application has a high oil content and good self-lubricating properties, which can significantly reduce the internal friction and breakage of the metal rope, thereby improving the bending life of the coated metal rope.

[0017] A second aspect of the present invention provides a method for preparing a high-oil-content coated metal rope, comprising the following steps:

[0018] (1) Prepare the core wire, adding the first lubricating oil during the preparation process;

[0019] (2) Prepare the side wire. During the preparation process, add a second lubricating oil. After the preparation is completed, wrap the side wire around the core wire to obtain a metal rope.

[0020] (3) A plastic outer layer is coated on the outer surface of the metal rope, wherein the flash point of the first lubricating oil is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer.

[0021] Further, step (1) includes: spraying the first lubricating oil in the form of a mist onto multiple first sub-wires, and twisting the multiple first sub-wires together to obtain a core wire.

[0022] Further, step (2) includes: spraying the second lubricating oil in the form of a mist onto multiple second sub-wires, and twisting the multiple second sub-wires together to form a side wire, and winding the side wire around the core wire to form a metal rope.

[0023] Further, step (3) includes: generating a continuous plastic outer layer on the outer surface of the metal rope to obtain a high oil content coated metal rope, wherein the oil content of the high oil content coated metal rope is ≥1.5%.

[0024] A third aspect of the present invention provides an application of a high-oil-content coated metal rope, including its application in the automotive field, wherein the high-oil-content coated metal rope is the aforementioned high-oil-content coated metal rope, or the high-oil-content coated metal rope is prepared according to the aforementioned method.

[0025] Furthermore, applications in the automotive field include the use of high-oil-content coated metal ropes in the drive mechanisms of vehicle sliding doors.

[0026] The beneficial technical effects of this invention are as follows:

[0027] The present invention determines the type of first and second lubricating oil based on the melting temperature of the coated plastic outer layer, ensuring that the flash point of both the first and second lubricating oils is higher than the melting temperature of the plastic outer layer. This significantly reduces the amount of oil evaporation during the coating process, preventing bulging, bubbles, and coating failure of the plastic outer layer.

[0028] The oil content of the coated metal rope of this invention is much higher than that of existing coated metal ropes (oil content 0.3% or no oil), which has good self-lubricating properties and can significantly reduce internal friction and breakage of the metal rope. When the high oil content coated metal rope of this invention is applied to the automotive field, it can be used in the drive mechanism of the vehicle's side sliding door. Since the bending life of the coated metal rope of this invention is ≥200,000 times, it can be used in the narrow area and small bending radius space of the vehicle.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. In the drawings:

[0031] Figure 1 A schematic diagram of the cross-section of a commercially available coated metal rope;

[0032] Figure 2 This is a schematic diagram of the cross-section of the core wire in this application;

[0033] Figure 3 This is a schematic diagram of the side section of this application;

[0034] Figure 4 This is a schematic diagram of the cross-section of the high oil content coated metal rope of this application. Detailed Implementation

[0035] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of the invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of the invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of the invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of the invention are merely illustrative and should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be covered within the scope of protection of the invention.

[0036] First, it should be noted that the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0037] like Figure 1As shown, the common structure of commercially available coated metal ropes includes a core wire, side wires, and a coating layer. According to the GB / T14451 standard, the side wires consist of 8 strands, each composed of 7 steel wires; the core wire consists of 1 strand, each composed of 19 steel wires; the outer diameter of the coated metal rope is 1.5mm, and its interior contains no oil or has a very low oil content, generally around 0.3%. In this type of commercially available coated metal rope, the oil cannot effectively cover all contact surfaces inside the metal rope. When used in scenarios with many bends or small bending radii, the internal lubricant is insufficient, causing the internal steel wires to wear against each other and break within a short time, failing to meet the usage requirements.

[0038] To address the above problems, this invention provides a method for preparing a high-oil-content coated metal rope, comprising the following steps:

[0039] (1) Prepare the core wire, and add the first lubricating oil during the preparation process.

[0040] Specifically, this step uses a twisting machine to twist 1×19 first sub-wires (each core wire consists of 1 strand, and each strand consists of 19 first sub-wires). During the twisting process, a metering valve is used to draw in a certain amount of first lubricating oil into the atomizing nozzle, and then compressed air is used to spray the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted, the first lubricating oil will be evenly distributed in the gaps between multiple first sub-wires.

[0041] In this step, the metering valve knob is adjusted in advance so that the oil content of the 19 first sub-lines after being combined is between 0.5% and 1% (in this process, a trial production is required to determine whether the oil content meets the standard).

[0042] More specifically, in subsequent processes, the plastic coating needs to be heated to a molten state to cover the surface of the metal rope. Traditional lubricants have a low flash point, generally around 120°C. This coating process can cause the lubricant inside the metal rope to vaporize, resulting in a decrease in the grease content of the metal rope or the formation of bubbles during coating, leading to an uneven coating surface. Therefore, in this step, the core wire does not directly contact the outer plastic layer, and the heating rate is relatively slow. The flash point of the first lubricant selected in this step is 20°C to 30°C higher than the melting temperature of the outer plastic layer. Furthermore, by increasing the oil content of the core wire in this step, the first lubricant can be evenly distributed inside the core wire.

[0043] (2) Prepare the side wire. During the preparation process, add a second lubricating oil. After the preparation is completed, wrap the side wire around the core wire to obtain a metal rope.

[0044] Specifically, in this step, the side wire directly contacts the coating layer. Therefore, the second lubricating oil is different from the first lubricating oil and has a higher flash point to lubricate the outer surface of the metal rope and prevent the local temperature from becoming too high when in direct contact with the plastic outer layer, exceeding the evaporation temperature of the second lubricating oil and increasing the amount of oil evaporation.

[0045] In this step, a twisting machine is used to twist 8×7 second sub-lines (the side lines consist of 8 strands, and each strand consists of 7 second sub-lines). During the twisting process, a metering valve is used to draw in a certain amount of second lubricating oil into the atomizing nozzle, and then compressed air is used to spray the second lubricating oil in a mist form onto multiple second sub-lines. While the second sub-lines are twisted, the second lubricating oil will be evenly distributed in the gaps between multiple second sub-lines.

[0046] In this step, adjust the metering valve knob in advance so that the oil content after the second sub-line is combined is between 1% and 1.5% (in this process, a trial production is required to determine whether the oil content meets the standard).

[0047] In this step, the side wire is wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to make the final oil content of the metal rope 1.5% to 3.0%.

[0048] (3) A plastic outer layer is coated on the outer surface of the metal rope, wherein the flash point of the first lubricating oil is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer.

[0049] Furthermore, the order of preparation steps (1) and (2) in this application can be interchanged without affecting the final product prepared in this application.

[0050] Specifically, to ensure continuous coverage, uniform outer diameter, and absence of gaps and holes in the plastic outer layer, this step involves coating using an extruder. More specifically, depending on the application of the metal rope, other coating methods may also be used, which will not be elaborated upon here.

[0051] In this process, the metal rope passes through the center of the mold. After the plastic is heated to a molten state, it is extruded into the mold through the extruder's pusher screw. As the metal rope passes through continuously, it will be evenly wrapped around the surface. The coated metal rope made in this way will eventually have an oil content of more than 1.5%.

[0052] More specifically, the base oil of high flash point lubricants is generally a synthetic hydrocarbon oil (PAO or polyether oil), perfluoropolyether oil (PFPE), or silicone oil, with the addition of other high-temperature resistant lubricating components such as molybdenum disulfide and graphite. The coating materials used for the plastic outer layer in this application include nylon-11 with a melting temperature of 150℃ to 280℃, such as Ultramid PA11 produced by BASF (melting temperature 240℃); PA11 produced by Arkema (melting temperature 280℃); and copolymer nylon-11 produced by Shanghai Xinhao Chemical (melting temperature 150℃). Therefore, this application can choose the DEHYLUB series ester lubricants provided by Emery Oleochemicals. These lubricants have a high flash point and low viscosity, making them suitable for use in high-temperature and narrow-gauge environments. For example, DEHYLUB-4003 can be used as the primary lubricant, with a flash point above 170℃ and a kinematic viscosity of 4 mm⁻¹. 2 / s, using DEHYLUB-4033 as the second lubricant, with a flash point above 200℃ and a kinematic viscosity of 10.5mm. 2 / s; The first lubricant is Mobil Glygoyle 150 fully synthetic gear oil, with a flash point above 270°C and a kinematic viscosity of 150 mmHg. 2 / s; The second lubricating oil is Mobil Glygoyle 220 fully synthetic gear oil, with a flash point above 300℃ and a kinematic viscosity of 22 mm. 2 / s.

[0053] The present invention also provides a high-oil-content coated metal rope, comprising a metal rope and a plastic outer layer coated on the outer surface of the metal rope. The metal rope includes a core wire containing a first lubricating oil and side wires containing a second lubricating oil, the side wires being wound around the outer surface of the core wire.

[0054] The flash point of the first lubricating oil is 20℃~30℃ higher than the melting temperature of the outer plastic layer;

[0055] The flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer.

[0056] Specifically, the core wire containing the first lubricating oil does not directly contact the plastic outer layer, and its heating rate is relatively slow. Therefore, the flash point of the selected first lubricating oil does not need to be too high compared to the melting temperature of the plastic outer layer. On the other hand, the side wire containing the second lubricating oil directly contacts the plastic outer layer and its heating rate is fast. Therefore, the flash point of the selected second lubricating oil is significantly higher than the melting temperature of the plastic outer layer, thereby preventing local temperature rise during the coating of the plastic outer layer, which would result in a high evaporation rate of the first and second lubricating oils.

[0057] Furthermore, the oil content of the coated metal rope is ≥1.5%. The oil content of the coated metal rope in this application is significantly higher than that of existing coated metal ropes. The oil inside the coated metal rope can uniformly lubricate the internal gaps of the metal rope. During the coating process of the plastic outer layer, the high oil content can avoid the generation of air bubbles during coating, and the surface of the plastic outer layer is smooth.

[0058] Furthermore, the bending life of the coated metal rope is ≥200,000 cycles. Due to its high oil content, the coated metal rope of this application exhibits excellent self-lubricating properties, which significantly reduces internal friction and breakage, thereby improving its bending life.

[0059] Furthermore, the metal ropes of this application include, but are not limited to, steel wire ropes and chains, with steel wire ropes being the preferred type.

[0060] The present invention also provides an application of a high oil content coated metal rope, including the application of the high oil content coated metal rope in the automotive field, wherein the high oil content coated metal rope is the aforementioned high oil content coated metal rope, or the high oil content coated metal rope is prepared according to the above method.

[0061] Furthermore, when metal ropes, specifically steel wire ropes, are used in the automotive field, they need to bend within the confined space of the vehicle body and are mostly exposed to the outside, bearing a heavy load. Due to corrosion protection requirements, metal ropes are typically coated with plastic. However, after coating, the external lubricant can no longer lubricate the metal rope. In this case, a bending life of over 200,000 cycles is still required (the bends involve repeated bending). Therefore, the high-oil-content coated metal rope prepared in this application can be applied to the drive mechanism of a vehicle's sliding door, allowing for use in confined spaces with small bending radii within the vehicle.

[0062] The present invention will be described in detail below through specific examples and embodiments. It should also be understood that the following embodiments are only for specific illustration of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made by those skilled in the art based on the above description of the present invention are within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make appropriate selections within the appropriate range based on the description herein, and are not intended to be limited to the specific values ​​in the examples below.

[0063] Example 1

[0064] (1) Use a twisting machine to twist 1×19 first strands together. During the twisting process, use a metering valve to draw a certain amount of first lubricating oil (DEHYLUB-4003 is used as the first lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 1%.

[0065] (2) Use a twisting machine to twist 8×7 second strands together. During the twisting process, use a metering valve to draw in a certain amount of second lubricating oil (DEHYLUB-4033 is used as the second lubricating oil, flash point 200℃, kinematic viscosity 10.5mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 1%.

[0066] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0067] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The plastic coating material is copolymer nylon-11 with a melting temperature of 150°C, resulting in a coated steel wire rope with an oil content of 2% to 2.5%.

[0068] Example 2

[0069] (1) Use a twisting machine to twist 1×19 first sub-wires together. During the twisting process, use a metering valve to draw in a certain amount of first lubricating oil (selected from Mobil Glygoyle 150 fully synthetic gear oil, flash point 270℃, kinematic viscosity 150 mmHg). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 0.5%.

[0070] (2) Use a twisting machine to twist the 8×7 second strands together. During the twisting process, use a metering valve to draw in a certain amount of second lubricating oil (selected from Mobil Glygoyle 220 fully synthetic gear oil, flash point 300℃, kinematic viscosity 22mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 1%.

[0071] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0072] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The coating material of the plastic outer layer is Ultramid PA11 produced by BASF, with a melting temperature of 240°C, to obtain a coated steel wire rope with an oil content of 1.5% to 2%.

[0073] Example 3

[0074] (1) Use a twisting machine to twist 1×19 first sub-wires together. During the twisting process, use a metering valve to draw in a certain amount of first lubricating oil (selected from Mobil Glygoyle 150 fully synthetic gear oil, flash point 270℃, kinematic viscosity 150 mmHg). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 1.5%.

[0075] (2) Use a twisting machine to twist the 8×7 second strands together. During the twisting process, use a metering valve to draw in a certain amount of second lubricating oil (selected from Mobil Glygoyle 220 fully synthetic gear oil, flash point 300℃, kinematic viscosity 22mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 1.5%.

[0076] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0077] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The coating material of the plastic outer layer is Ultramid PA11 produced by BASF, with a melting temperature of 240°C, to obtain a coated steel wire rope with an oil content of 3%.

[0078] Comparative Example 1

[0079] (1) Use a twisting machine to twist 1×19 first strands together. During the twisting process, use a metering valve to draw a certain amount of first lubricating oil (DEHYLUB-4003 is used as the first lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 0.1%.

[0080] (2) Use a twisting machine to twist 8×7 second strands together. During the twisting process, use a metering valve to draw a certain amount of second lubricating oil (DEHYLUB-4003 as the second lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 0.1%.

[0081] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0082] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The coating material of the plastic outer layer is Ultramid PA11 produced by BASF, with a melting temperature of 240°C, to obtain a coated steel wire rope with an oil content of 0.2%.

[0083] Comparative Example 2

[0084] (1) Use a twisting machine to twist 1×19 first strands together. During the twisting process, use a metering valve to draw a certain amount of first lubricating oil (DEHYLUB-4003 is used as the first lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 0.7%.

[0085] (2) Use a twisting machine to twist 8×7 second sub-threads together to obtain oil-free side thread.

[0086] The side wires are wound onto the core wire again using a stranding machine to produce a steel wire rope with an outer diameter of 1.5 mm.

[0087] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The coating material of the plastic outer layer is copolymer nylon-11 with a melting temperature of 150°C, resulting in a coated steel wire rope with an oil content of 0.7%.

[0088] Comparative Example 3

[0089] (1) Use a twisting machine to twist 1×19 first sub-wires together. During the twisting process, use a metering valve to draw in a certain amount of first lubricating oil (selected from Mobil Glygoyle 150 fully synthetic gear oil, flash point 270℃, kinematic viscosity 150 mmHg). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 1%.

[0090] (2) Use a twisting machine to twist the 8×7 second strands together. During the twisting process, use a metering valve to draw in a certain amount of second lubricating oil (selected from Mobil's Glygoyle 150 fully synthetic gear oil, flash point 270℃, kinematic viscosity 150 mmHg). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 1%.

[0091] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0092] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The plastic coating material is Ultramid PA11 produced by BASF, with a melting temperature of 240°C, to obtain a coated steel wire rope with an oil content of 2%.

[0093] Comparative Example 4

[0094] (1) Use a twisting machine to twist 1×19 first sub-wires together. During the twisting process, use a metering valve to draw a certain amount of first lubricating oil (selected from Mobil Glygoyle 220 fully synthetic gear oil, flash point 300℃, kinematic viscosity 22mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 1%.

[0095] (2) Use a twisting machine to twist the 8×7 second strands together. During the twisting process, use a metering valve to draw in a certain amount of second lubricating oil (selected from Mobil Glygoyle 220 fully synthetic gear oil, flash point 300℃, kinematic viscosity 22mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 1%.

[0096] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0097] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The plastic coating material is Ultramid PA11 produced by BASF, with a melting temperature of 240°C, to obtain a coated steel wire rope with an oil content of 2%.

[0098] Comparative Example 5

[0099] (1) Use a twisting machine to twist 1×19 first strands together. During the twisting process, use a metering valve to draw a certain amount of first lubricating oil (DEHYLUB-4003 is used as the first lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the first lubricating oil in a mist form onto multiple first sub-wires. While the first sub-wires are twisted together, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, resulting in a core wire with an oil content of 0.1%.

[0100] (2) Use a twisting machine to twist 8×7 second strands together. During the twisting process, use a metering valve to draw a certain amount of second lubricating oil (DEHYLUB-4003 as the second lubricating oil, flash point 170℃, kinematic viscosity 4mm). 2 / s) enters the atomizing nozzle, and then compressed air sprays the second lubricating oil in a mist form onto multiple second sub-lines. As the second sub-lines twist together, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-lines, resulting in a sideline with an oil content of 0.1%.

[0101] The side wires are wound onto the core wire again using a stranding machine. A second lubricant can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

[0102] (3) A plastic outer layer is coated on the outer surface of the steel wire rope using an extruder. The plastic coating material is PA11 produced by Arkema with a melting temperature of 280°C, resulting in a coated steel wire rope with an oil content of 0.2%.

[0103] Performance testing

[0104] Oil content: The oil content of the coated steel wire rope was determined by weighing a specified length of the coated steel wire rope, then disassembling the rope, cleaning off the grease, and weighing it again. The grease / total weight was then calculated as the oil content. The oil content of the coated steel wire ropes prepared in each embodiment and comparative example was tested, and the results are shown in Table 1.

[0105] Bending life: The test standard was GB / T12347, the test wheel radius was R10, the load was 225N, the load was a single steel wire rope, and an L-shaped test bench was used to test the bending life of the coated steel wire ropes prepared in each embodiment and each comparative example. The test results are shown in Table 1.

[0106] The experimental data and analysis are as follows:

[0107] Table 1. Performance of coated steel wire ropes prepared in each embodiment and comparative example.

[0108]

[0109]

[0110] The core wire, side wires, and cross-section of the high oil content coated steel wire ropes prepared in Examples 1 to 3 of this application are as follows: Figure 2 , Figure 3 and Figure 4 As shown in Table 1, in Example 1 of this application, DEHYLUB-4003 was used as the first lubricating oil, with a flash point above 170°C and a kinematic viscosity of 4 mmHg. 2 / s, using DEHYLUB-4033 as the second lubricant, with a flash point above 200℃ and a kinematic viscosity of 10.5mm. 2 In this embodiment, the second lubricating oil has a high flash point, slightly high kinematic viscosity, and poor fluidity, making it difficult to evenly cover the wire rope. However, it is used on the outer layer of the wire rope, mainly to improve the overall temperature resistance of the wire rope. The first lubricating oil has a low kinematic viscosity and a low flash point, and it is used on the inner side, which helps to improve the coverage of the first lubricating oil, thereby improving the self-lubricating properties of the wire rope. After the wire rope is coated in this embodiment, during the use of the coated wire rope, the first and second lubricating oils inside will gradually mix due to mutual compression and molecular diffusion among the various first and second sub-wires. This results in good self-lubricating properties of the coated wire rope. After bending life testing, its bending life can be stabilized at 200,000 cycles. The coated wire rope does not break during use and has stable performance. It can be used in the drive mechanism of vehicle side sliding doors and can be used in narrow areas with small bending radii in vehicles.

[0111] The coated steel wire ropes of Examples 2 and 3 of this application have a high oil content, and their bending life can reach 400,000 times. They do not break during use, have stable performance, and can meet the needs of use under many extreme conditions in automobiles.

[0112] In contrast, the first and second lubricating oils used in Comparative Example 1 had flash points lower than the melting temperature of the plastic coating material, resulting in coating failure. When the lubricating oil came into contact with the molten plastic, a large amount of it evaporated, and the generated gas could not be expelled in time. It was trapped inside the outer layer of the plastic, causing bubbles to form on the outer layer and making the outer layer of the plastic rough. Furthermore, the coated steel wire rope was prone to breakage during use and its performance was unstable.

[0113] Comparative Example 2 increased the oil content of the core wire while keeping the outer side wires oil-free to delay the evaporation of lubricating oil at high temperatures. This method could increase the oil content of the coated steel wire rope to a maximum of 0.7%. Further increases would result in an uneven coating. Moreover, the coated steel wire rope was prone to breakage and had unstable performance during use.

[0114] Comparative Example 3 shows that the oil content can be increased up to 2%. There are no problems during short-term production, but during continuous production of several kilometers, due to the accumulation of heat and volatile gases, substandard line segments may occasionally appear. This is highly sporadic and cannot ensure stable production.

[0115] In Comparative Example 4, during production, due to the increased kinematic viscosity of the first and second lubricating oils, the sprayed lubricating oil particles were larger, reducing lubrication uniformity. Although the wire rope could be produced smoothly, the bending life of samples taken from wire ropes produced at different times showed certain differences during the bending life test.

[0116] The first and second lubricating oils used in Comparative Example 5 had flash points lower than the melting temperature of the coating material, resulting in coating failure. Furthermore, the coated steel wire rope was prone to breakage during use, exhibiting unstable performance. During the preparation of the coated steel wire rope, if a low-flash-point lubricating oil was used, the oil would evaporate, resulting in a low total oil content and uneven lubrication within the wire rope. Increasing the oil content by more than 0.5% would cause the evaporated gas to lead to blistering and porosity in the coating layer, resulting in coating failure. If a high-flash-point lubricating oil, such as Glygoyle 220 (flash point above 300℃), was used, the evaporated gas was reduced, resulting in a smooth outer plastic layer. However, the grease was too viscous for spraying; drip coating resulted in uneven internal distribution and poor automatic uniformity. With an oil content of 1.2%, the durability was around 100,000 cycles. With an oil content of 2%, the durability was around 200,000 cycles, but the drip coating method resulted in inaccurate oil volume control and poor distribution.

[0117] In summary, the coated steel wire rope prepared by the method of this application has good internal capillary uniformity, external high temperature resistance, and takes into account both uniform oil distribution and temperature resistance. The total oil content is 1.5% to 3.0%, and the bending life can reach more than 400,000 cycles.

[0118] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high-oil-content coated metal rope, characterized in that, The system includes a metal rope and a plastic outer layer coated on the outer surface of the metal rope. The metal rope includes a core wire containing a first lubricant and side wires containing a second lubricant, the side wires being wound around the outer surface of the core wire. The flash point of the first lubricating oil is 20°C to 30°C higher than the melting temperature of the plastic outer layer; the flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer; the base oils of the first and second lubricating oils are synthetic hydrocarbon oils, perfluoropolyether oils, or silicone oils, with the addition of molybdenum disulfide and graphite high-temperature resistant lubricating components. The coated metal rope has an oil content of ≥1.5%; the coated metal rope has a bending life of ≥200,000 cycles; the plastic coating material selected for the outer plastic layer includes Nylon-11 with a melting temperature of 150℃~280℃.

2. A method for preparing a high-oil-content coated metal rope, characterized in that, The preparation of the high oil content coated metal rope according to claim 1 includes the following steps: (1) Prepare the core wire, adding the first lubricating oil during the preparation process; (2) Prepare the side wire. During the preparation process, add a second lubricating oil. After the preparation is completed, wrap the side wire around the core wire to obtain a metal rope. (3) A plastic outer layer is coated on the outer surface of the metal rope, wherein the flash point of the first lubricating oil is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricating oil is more than 50°C higher than the melting temperature of the plastic outer layer.

3. The method according to claim 2, characterized in that, Step (1) includes: spraying the first lubricating oil in a mist form onto multiple first sub-wires, and twisting the multiple first sub-wires together to obtain the core wire.

4. The method according to claim 2, characterized in that, Step (2) includes: spraying the second lubricating oil in a mist form onto multiple second sub-wires, twisting the multiple second sub-wires together to form the side wire, and winding the side wire around the core wire to form the metal rope.

5. The method according to claim 2, 3 or 4, characterized in that, Step (3) includes: generating a continuous plastic outer layer on the outer surface of the metal rope to obtain the high oil content coated metal rope, wherein the oil content of the high oil content coated metal rope is ≥1.5%.

6. An application of a high-oil-content coated metal rope, characterized in that, This includes the application of high-oil-content coated metal ropes in the automotive field, wherein the high-oil-content coated metal rope is the high-oil-content coated metal rope as described in claim 1, or the high-oil-content coated metal rope is prepared by the method according to any one of claims 2 to 5.

7. The application according to claim 6, characterized in that, The application in the automotive field includes the use of the high-oil-content coated metal rope in the drive mechanism of a vehicle's sliding door.

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