High-oil-content coated metal rope as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of metal ropes, and provides a high-oil-content coated metal rope and a preparation method and application thereof.The coated metal rope comprises a metal rope body and a plastic outer layer coated on the outer surface of the metal rope body, and the metal rope body comprises a core wire containing first lubricating oil and a side wire containing second lubricating oil; the side wire is wound on the outer surface of the core wire, and the flash point of the first lubricating oil is 20-30 DEG C higher than the melting temperature of the plastic outer layer; the flash point of the second lubricating oil is 50 DEG C higher than the melting temperature of the plastic outer layer. According to the method, in the plastic outer layer coating process, the oil volatilization amount can be greatly reduced, plastic outer layer swelling, bubble existence and coating failure are avoided, the prepared high-oil-content coated metal rope is good in self-lubricating performance, internal friction and breakage of the metal rope can be greatly reduced, and the high-oil-content coated metal rope can be applied to a driving mechanism of a vehicle side sliding door.

Description

Technical Field

[0001] The present application relates to the technical field of metal ropes, and in particular to a high-oil-content coated metal rope and a preparation method and application thereof. Background Art

[0002] A wire rope is a helical bundle of steel wires with suitable mechanical properties and geometric dimensions, twisted together according to specific rules. It consists of steel wires, a core, and lubricating grease. Wire ropes are first twisted into strands from multiple layers of steel wire, then a predetermined number of strands are twisted around the core to form a spiral. They are used in material handling machinery for lifting, traction, tensioning, and load bearing. Wire ropes are widely used in daily life due to their high strength, light weight, stable operation, resistance to sudden breakage, and reliable operation.

[0003] In the production process of steel wire ropes, oiling is essential, including varieties such as phosphate-coated steel wire ropes, galvanized steel wire ropes, stainless steel wire ropes, and smooth steel wire ropes. Plastic-coated steel wire ropes are generally not coated with grease or are coated with a very small amount. The coated steel wire ropes on the market usually have a low oil content, generally around 0.3% or no oil. This is because the flash point of the lubricant is low. Regardless of the existing method used to coat the steel wire rope, the molten plastic will vaporize the lubricant, and the oil vapor will cause bubbles to form in the coating layer, resulting in coating failure. Since the surface of the coated steel wire rope is fully sealed, it cannot be lubricated at a later stage. If the oil content is low, it cannot effectively cover all the contact surfaces inside the steel wire rope. When the steel wire rope is bent frequently or the bending radius is small, due to insufficient internal lubricant, its sub-wires wear each other and break in a short period of time, failing to meet the expected use.

[0004] In order to improve at least one of the various performance aspects of the wire rope, existing technical personnel have continuously optimized the preparation process of the wire rope. For example, the patent application document with publication number CN111535061A discloses a high-wear-resistant and long-life crane-specific wire rope, including a central rope core and outer strands. The cross-section of the central rope core is a regular hexagon or a circle, and the outer strands are six strands with the same structure. Each outer strand specifically includes a central strand, an inner strand and an outer strand. The inner strand is twisted with nine galvanized wires around the central strand, and the outer strand is twisted with fifteen galvanized wires. The inner strand and the outer strand have the same twist direction, the inner strand wraps the central strand, and the outer strand wraps the inner strand. There is a filling layer between the inner strand and the outer strand, and the six outer strands are twisted on the central rope core. The steel wire rope has good softness and light weight, strong lateral compressive resistance, high tensile strength, good wear resistance, fatigue resistance, excellent lubricity and is not easy to rust. For example, the patent application document with publication number CN116695472A discloses a fire-extinguishing steel wire rope for ship loaders, which belongs to the technical field of ship loader steel wire ropes. A fire-extinguishing steel wire rope for ship loaders includes a plurality of wound steel wire tubes and a plurality of injection holes drilled on the steel wire tubes. Reinforced connecting plates are fixedly connected between the plurality of steel wire tubes. Flexible liquid storage tubes are provided inside the plurality of steel wire tubes. It generates carbon dioxide by fusing hydrochloric acid and sodium bicarbonate powder to reduce the oxygen gas nearby. At the same time, under the air pressure of the steel wire tube, the dry powder is sprayed out to cover the surface of the steel wire rope over a large area, thereby effectively alleviating the spread of fire. The setting of the tough connecting rod greatly strengthens the stability of the steel wire rope structure, effectively avoiding scattering during use, and the reinforced connecting plate connected between the two steel wire tubes can effectively avoid deformation of the steel wire rope due to the high temperature generated when it encounters fire.

[0005] However, while lubricating the outer strands of the aforementioned crane-specific wire rope and adding an oil reservoir improves wear resistance, the authors fail to demonstrate the oil content range and the impact of the outer lubrication and reservoir on the wire rope's bendability. Furthermore, lubricating the flexible connecting rods of the aforementioned fire-extinguishing wire rope only addresses the issue of increased wear resistance, but fails to demonstrate a positive impact on the wire rope's bendability. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-oil-content coated metal rope and its preparation method and application. The oil content is higher than that of the existing metal rope and the coated metal rope has a smooth surface and a long bending life.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A 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, wherein the metal rope comprises a core wire containing a first lubricating oil and a side wire containing a second lubricating oil, wherein the side wire is wound around the outer surface of the core wire,

[0009] The flash point of the first lubricant is 20°C to 30°C higher than the melting temperature of the plastic outer layer;

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

[0011] According to the above technical means, the core wire containing the first lubricant in the present application does not directly contact the plastic outer layer, and the heating rate is relatively slow. Therefore, the flash point of the selected first lubricant does not need to be too high compared to the melting temperature of the plastic outer layer; and the side wire containing the second lubricant directly contacts the plastic outer layer and heats up quickly. Therefore, the flash point of the selected second lubricant is significantly higher than the melting temperature of the plastic outer layer, thereby preventing the local temperature from rising when coating the plastic outer layer, resulting in a high volatility of the first lubricant and the second lubricant.

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

[0013] According to the above technical means, the oil content of the coated metal rope of the present application is significantly improved compared with the existing coated metal rope. The oil in the coated metal rope can evenly 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 bubbles during coating, and the surface of the plastic outer layer is smooth.

[0014] Furthermore, the plastic coating material selected for the plastic outer layer includes nylon-11 with a melting temperature of 150° C. to 280° C.

[0015] Furthermore, the coated metal rope has a bending life of ≥ 200,000 times.

[0016] According to the above technical means, the coated metal rope of the present application has good self-lubricating properties due to its high oil content, which can greatly reduce internal friction and breakage of the metal rope, thereby increasing 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) preparing a core wire, and adding a first lubricating oil during the preparation process;

[0019] (2) preparing a side wire, adding a second lubricating oil during the preparation process, and winding the side wire around the core wire after the preparation is completed to prepare 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 lubricant is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricant is more than 50°C higher than the melting temperature of the plastic outer layer.

[0021] Furthermore, step (1) includes: spraying the first lubricating oil in a mist form on the plurality of first sub-wires, and plying the plurality of first sub-wires to obtain a core wire.

[0022] Furthermore, step (2) includes: spraying the second lubricating oil in a mist form on the plurality of second sub-wires, plying the plurality of second sub-wires to obtain side wires, and winding the side wires onto the core wire to obtain the metal rope.

[0023] Furthermore, step (3) includes: forming 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 an application of the high-oil-content coated metal rope in the automotive field, wherein the high-oil-content coated metal rope is the above-mentioned high-oil-content coated metal rope, or the high-oil-content coated metal rope is prepared according to the above-mentioned method.

[0025] Further, applications in the automotive field include the application of high-oil-content coated metal ropes in the drive mechanism of vehicle side sliding doors.

[0026] The beneficial technical effects of the present invention are:

[0027] The present invention determines the types of the first and second lubricating oils selected based on the melting temperature of the coated plastic outer layer, ensuring that the flash points of the first and second lubricating oils are both higher than the melting temperature of the plastic outer layer. This significantly reduces the amount of oil volatilization during the coating process of the plastic outer layer, thereby avoiding bulging, bubbles, and coating failure of the plastic outer layer.

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

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and it is possible for a person of ordinary skill in the art to derive other drawings based on these drawings without inventive effort. In the accompanying drawings:

[0031] Figure 1 A schematic cross-sectional view of an existing commercially available coated metal rope;

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

[0033] Figure 3 This is a schematic cross-sectional diagram of the side line of this application;

[0034] Figure 4 This is a schematic cross-sectional view of the high oil content coated metal rope in this application. DETAILED DESCRIPTION

[0035] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention pertains. It should be understood that certain features of the present invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. On the contrary, a plurality of features of the present invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or in any other described embodiment of the present invention when appropriate. Certain features described in the context of various embodiments will not be considered as essential features of those embodiments unless the embodiment is inoperable without those elements. The present invention will be further described below by specific examples, but it should be noted that the specific process conditions and results described in the embodiments of the present invention are only used to illustrate the present invention and cannot limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and substance of the present invention should be included within the scope of protection of the present invention.

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

[0037] like Figure 1As shown, the structure of a commonly available coated metal rope on the market consists of a core wire, side wires, and a coating. According to the GB / T14451 standard, the side wires consist of eight strands, each made of seven steel wires; the core wire consists of one strand, each made of 19 steel wires. The coated metal rope has an outer diameter of 1.5 mm and contains no oil or a low oil content, generally around 0.3%. The oil in this commercially available coated metal rope does not effectively cover all contact surfaces within the rope. When used in applications with numerous bends or small bend radii, the rope lacks lubrication, causing the steel wires to wear against each other and break quickly, making it unsuitable for use.

[0038] In view of the above problems, the present invention provides a method for preparing a high-oil-content coated metal rope, comprising the following steps:

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

[0040] Specifically, this step uses a stranding machine to strand 1×19 first sub-lines (the core line is composed of 1 strand, and each strand is composed of 19 first sub-lines). During the stranding process, a metering valve is used to absorb 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-lines. While the first sub-lines are stranded, the first lubricating oil will be evenly distributed in the gaps between the multiple first sub-lines.

[0041] In this step, the knob of the quantitative valve is adjusted in advance so that the oil content of the 19 first sub-lines after being stranded 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 the subsequent process, the coating plastic needs to be heated to a molten state before covering the surface of the metal rope. Conventional lubricants have a low flash point, typically around 120°C. This coating process can cause the lubricant inside the metal rope to vaporize, reducing the grease content or creating bubbles during coating, resulting in 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 for this step is 20°C to 30°C higher than the melting point of the outer plastic layer. Furthermore, by increasing the oil content of the core wire in this step, the first lubricant is evenly distributed throughout the core wire.

[0043] (2) preparing a side line, adding a second lubricating oil during the preparation process, and winding the side line around the core line after the preparation is completed to prepare a metal rope.

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

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

[0046] In this step, adjust the dosing valve knob in advance so that the oil content of the second sub-line after stranding 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 again wound onto the core wire by the stranding machine. A second lubricating oil may also be used during the winding process to ensure that the final oil content of the metal rope is 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 lubricant is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricant is more than 50°C higher than the melting temperature of the plastic outer layer.

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

[0050] Specifically, to ensure continuous coverage of the plastic outer layer, uniform outer diameter, and no gaps or holes, this step uses an extruder for coating. More specifically, other coating methods can also be used depending on the use scenario of the metal rope, which will not be described here.

[0051] In the process, the metal rope passes through the center of the mold. After the plastic is heated to a molten state, it is squeezed into the mold through the pushing screw of the extruder. After the metal rope passes continuously, it will be evenly wrapped on the surface. The coated metal rope made by this method has a final oil content of more than 1.5%.

[0052] More specifically, the base oil of high flash point lubricants is generally synthetic hydrocarbon oil (PAO or polyether oil), perfluoropolyether oil (PFPE) or silicone oil, and other high temperature resistant lubricating ingredients such as molybdenum disulfide and graphite are added. The coating materials selected for the outer plastic layer of this application include nylon-11 with a melting temperature of 150°C to 280°C, such as Ultramid PA11 produced by BASF AG (BASF), with a melting temperature of 240°C; PA11 produced by Arkema, with a melting temperature of 280°C; and copolymer nylon-11 produced by Shanghai Xinhao Chemical, with a melting temperature of 150°C. Therefore, this application can choose the DEHYLUB series ester lubricants provided by Emery Oleochemicals. This type of lubricant has a high flash point and low viscosity, and is suitable for use at high temperatures and small gaps. For example, DEHYLUB-4003 is used as the first lubricant, with a flash point above 170°C and a kinematic viscosity of 4mm. 2 / s, using DEHYLUB-4033 as the second lubricant, with a flash point above 200°C and a kinematic viscosity of 10.5 mm 2 / s; The first lubricant is Mobil's Glygoyle 150 fully synthetic gear oil, with a flash point above 270°C and a kinematic viscosity of 150 mm 2 / s; The second lubricant is Mobil's Glygoyle 220 fully synthetic gear oil, with a flash point above 300°C and a kinematic viscosity of 22mm 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, wherein the metal rope comprises a core wire containing a first lubricating oil and a side wire containing a second lubricating oil, wherein the side wire is wound on the outer surface of the core wire,

[0054] The flash point of the first lubricant is 20°C to 30°C higher than the melting temperature of the plastic outer layer;

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

[0056] Specifically, the core wire containing the first lubricant in the present application does not directly contact the plastic outer layer and has a relatively slow heating rate. Therefore, the flash point of the selected first lubricant does not need to be too high compared to the melting temperature of the plastic outer layer; while the side wire containing the second lubricant directly contacts the plastic outer layer and has a fast heating rate. Therefore, the flash point of the selected second lubricant is significantly higher than the melting temperature of the plastic outer layer, thereby preventing the local temperature from rising when coating the plastic outer layer, resulting in a high volatility of the first lubricant and the second lubricant.

[0057] Furthermore, the oil content of the coated metal rope is ≥1.5%. Compared to existing coated metal ropes, the oil content of the coated metal rope in this application is significantly improved. The oil in the coated metal rope can evenly lubricate the gaps within the metal rope. During the coating process of the plastic outer layer, the high oil content can prevent bubbles from forming during the coating process, and the surface of the plastic outer layer is smooth.

[0058] Furthermore, the bending life of the coated metal rope is ≥ 200,000 times. Due to the high oil content, the coated metal rope of the present application has good self-lubricating properties, which can significantly reduce internal friction and breakage of the metal rope, thereby increasing the bending life of the coated metal rope.

[0059] Furthermore, the metal rope of the present application includes but is not limited to a steel wire rope and a chain, and the metal rope of the present application is preferably a steel wire rope.

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

[0061] Furthermore, when metal ropes, specifically steel wire ropes, are used in automobiles, they must bend within the confined spaces of the vehicle body and are largely exposed to the exterior, subjecting them to heavy loads. For corrosion protection, these ropes are typically plastic-coated. However, this coating eliminates the lubrication of the ropes with external lubricants. Furthermore, they require a bending lifespan of at least 200,000 cycles (bending is a process of repeated bending). Therefore, the high-oil-content coated metal ropes prepared in this application can be used in the drive mechanism of vehicle side sliding doors, accommodating use within the confined areas and small bending radius of a vehicle.

[0062] The present invention is described in detail below by way of specific examples. It should also be understood that the following examples are only used to specifically illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present invention all fall within the scope of protection of the present invention. The specific process parameters and the like in the following examples are only examples within a suitable range, and those skilled in the art can make selections within a suitable range through the description herein, and are not to be limited to the specific numerical values exemplified below.

[0063] Example 1

[0064] (1) Use a stranding machine to strand 1×19 first strands. During the stranding process, a metering valve is used to absorb a certain amount of the first lubricant (DEHYLUB-4003 is used as the first lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm). 2 / s) enters the atomizing nozzle, and then the compressed air sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. When the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 1%.

[0065] (2) Use a stranding machine to strand 8×7 second strands. During the stranding process, a metering valve is used to absorb a certain amount of second lubricant (DEHYLUB-4033 is used as the second lubricant, with a flash point of 200°C and a kinematic viscosity of 10.5 mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 1%.

[0066] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0068] Example 2

[0069] (1) 1×19 first strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of first lubricant (selected from Mobil's Glygoyle 150 fully synthetic gear oil, with a flash point of 270°C and a kinematic viscosity of 150 mm). 2 / s) enters the atomizing nozzle, and the compressed air then sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. As the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 0.5%.

[0070] (2) 8×7 second strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of second lubricant (Glygoyle 220 fully synthetic gear oil from Mobil Corporation, with a flash point of 300°C and a kinematic viscosity of 22 mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 1%.

[0071] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0073] Example 3

[0074] (1) 1×19 first strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of first lubricant (selected from Mobil's Glygoyle 150 fully synthetic gear oil, with a flash point of 270°C and a kinematic viscosity of 150 mm). 2 / s) enters the atomizing nozzle, and the compressed air then sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. As the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 1.5%.

[0075] (2) 8×7 second strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of second lubricant (Glygoyle 220 fully synthetic gear oil from Mobil Corporation, with a flash point of 300°C and a kinematic viscosity of 22 mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a lateral wire with an oil content of 1.5%.

[0076] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0078] Comparative Example 1

[0079] (1) Use a stranding machine to strand 1×19 first strands. During the stranding process, a metering valve is used to absorb a certain amount of the first lubricant (DEHYLUB-4003 is used as the first lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm). 2 / s) enters the atomizing nozzle, and the compressed air then sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. As the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 0.1%.

[0080] (2) Use a stranding machine to strand 8×7 second strands. During the stranding process, a metering valve is used to absorb a certain amount of the second lubricant (DEHYLUB-4003 as the second lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 0.1%.

[0081] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0083] Comparative Example 2

[0084] (1) Use a stranding machine to strand 1×19 first strands. During the stranding process, a metering valve is used to absorb a certain amount of the first lubricant (DEHYLUB-4003 is used as the first lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm). 2 / s) enters the atomizing nozzle, and the compressed air then sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. As the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 0.7%.

[0085] (2) 8×7 second sub-lines are twisted together using a stranding machine to produce an oil-free side line.

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

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

[0088] Comparative Example 3

[0089] (1) 1×19 first strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of first lubricant (selected from Mobil's Glygoyle 150 fully synthetic gear oil, with a flash point of 270°C and a kinematic viscosity of 150 mm). 2 / s) enters the atomizing nozzle, and then the compressed air sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. When the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 1%.

[0090] (2) 8×7 second strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of second lubricant (selected from Mobil's Glygoyle 150 fully synthetic gear oil, flash point 270°C, kinematic viscosity 150mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 1%.

[0091] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0093] Comparative Example 4

[0094] (1) 1×19 first strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of first lubricant (Glygoyle 220 fully synthetic gear oil from Mobil Corporation, with a flash point of 300°C and a kinematic viscosity of 22 mm 2 / s) enters the atomizing nozzle, and then the compressed air sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. When the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 1%.

[0095] (2) 8×7 second strands are stranded using a stranding machine. During the stranding process, a metering valve is used to absorb a certain amount of second lubricant (Glygoyle 220 fully synthetic gear oil from Mobil Corporation, with a flash point of 300°C and a kinematic viscosity of 22 mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 1%.

[0096] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0098] Comparative Example 5

[0099] (1) Use a stranding machine to strand 1×19 first strands. During the stranding process, a metering valve is used to absorb a certain amount of the first lubricant (DEHYLUB-4003 is used as the first lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm). 2 / s) enters the atomizing nozzle, and the compressed air then sprays the first lubricating oil in the form of mist onto the multiple first sub-wires. As the first sub-wires are plyed, the first lubricating oil is evenly distributed in the gaps between the multiple first sub-wires, thereby producing a core wire with an oil content of 0.1%.

[0100] (2) Use a stranding machine to strand 8×7 second strands. During the stranding process, a metering valve is used to absorb a certain amount of the second lubricant (DEHYLUB-4003 as the second lubricant, with a flash point of 170°C and a kinematic viscosity of 4mm 2 / s) enters the atomizing nozzle, and the compressed air then sprays the second lubricating oil in the form of mist onto the multiple second sub-wires. As the second sub-wires are plyed, the second lubricating oil is evenly distributed in the gaps between the multiple second sub-wires, producing a side line with an oil content of 0.1%.

[0101] The side wire is again wound onto the core wire through a stranding machine, and a second lubricating oil can also be used during the winding process to produce a steel wire rope with an outer diameter of 1.5 mm.

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

[0103] Performance testing

[0104] Oil content: The oil content of a coated steel wire rope is determined by weighing a specified length of the coated steel wire rope, disassembling the coated steel wire rope, cleaning the grease, and weighing it again. The oil content is calculated as the ratio of grease to total weight. The oil content of the coated steel wire ropes prepared in each Example and Comparative Example was tested, and the test results are shown in Table 1.

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

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

[0107] Table 1 Properties of coated steel wire ropes prepared in various embodiments and comparative examples

[0108]

[0109]

[0110] The cross-sections of the core wire, side wire and coated steel wire rope with high oil content prepared in Examples 1 to 3 of the present application are as follows: Figure 2 、 Figure 3 and Figure 4 Combined with Table 1, Example 1 of the present application uses DEHYLUB-4003 as the first lubricant, with a flash point above 170°C and a kinematic viscosity of 4 mm 2 / s, using DEHYLUB-4033 as the second lubricant, with a flash point above 200°C and a kinematic viscosity of 10.5 mm 2 / s, the second lubricant in this embodiment has a high flash point, a slightly high kinematic viscosity, poor fluidity, and is not easy to cover evenly, but it is used on the outer layer of the steel wire rope, and its main function is to improve the overall temperature resistance of the steel wire rope, while the first lubricant has a lower kinematic viscosity and a lower flash point. Its use on the inside is beneficial to increasing the coverage rate of the first lubricant, thereby enhancing the self-lubricating property of the steel wire rope; after the steel wire rope of this embodiment is coated, during the use of the coated steel wire rope, the first sub-wires and the second sub-wires inside it will be squeezed against each other and the molecules will diffuse, and the first lubricant and the second lubricant inside will gradually mix, thereby making the coated steel wire rope have good self-lubricating property. After the bending life test, its bending life can be stabilized at 200,000 times. The coated steel wire rope does not break during use and has stable performance. It can be used in the drive mechanism of the vehicle side sliding door and can be used in the narrow area of the vehicle with a small bending radius.

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

[0112] However, the flash points of the first lubricating oil and the second lubricating oil used in Comparative Example 1 are lower than the melting temperature of the plastic coating material used, and the coating fails. When the lubricating oil contacts the molten plastic, a large amount of volatilization occurs, and the generated gas cannot be removed in time and is wrapped in the outer layer of the plastic, causing bubbles to form in the outer layer of the plastic, and the outer layer of the plastic will also appear rough. In addition, the coated steel wire rope is easy to break during use and its performance is unstable.

[0113] In comparative example 2, the oil content of the core wire is increased, and the outer side wire is oil-free to delay the volatilization of the lubricating oil at high temperature. The oil content of the coated steel wire rope can be increased to 0.7% at most. If it is increased further, the coating layer will become rough. In addition, the coated steel wire rope is easy to break during use and the performance is unstable.

[0114] In comparative example 3, the oil content can be increased up to 2%, which is not a problem in short-term production. However, when the production continues for several thousand meters, the accumulation of heat and volatile gases may occasionally produce line segments that do not meet the surface standards. The sporadic nature of the occurrence is high, and stable production cannot be achieved.

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

[0116] The flash points of the first and second lubricants used in Comparative Example 5 were lower than the melting point of the plastic coating material, resulting in coating failure. Furthermore, the coated steel wire rope was prone to breakage during use and exhibited unstable performance. During the coated steel wire rope preparation process, if a low-flash-point lubricant is used, the oil evaporates, resulting in a low total oil content and uneven lubrication of the internal lubricant within the steel wire rope. Increasing the oil content by more than 0.5% results in volatile gases that cause bulging and porosity in the plastic coating, leading to coating failure. If a high-flash-point lubricant, such as Glygoyle 220, with a flash point above 300°C, is used, volatile gases are reduced, resulting in a smooth outer plastic layer. However, the grease is too viscous to spray, so drip coating results in uneven internal distribution and poor automatic oil distribution. At a 1.2% oil content, the durability is approximately 100,000 cycles. At a 2% oil content, the durability is approximately 200,000 cycles, but drip coating is difficult to control with accurate oil volume and poor distribution.

[0117] In summary, the coated steel wire rope prepared by the preparation method of the embodiment of the present application has good internal capillary self-distribution, 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 times.

[0118] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may 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 one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A high oil content coated metal rope, characterized in that: The invention comprises a metal rope and a plastic outer layer coated on the outer surface of the metal rope, wherein the metal rope comprises a core wire containing a first lubricating oil and a side wire containing a second lubricating oil, wherein the side wire is wound on the outer surface of the core wire, The flash point of the first lubricant is 20° C. to 30° C. higher than the melting temperature of the plastic outer layer; the flash point of the second lubricant is more than 50° C. higher than the melting temperature of the plastic outer layer.

2. The high oil content coated metal rope according to claim 1, characterized in that: The oil content of the coated metal rope is ≥1.5%.

3. The high oil content coated metal rope according to claim 1 or 2, characterized in that: The plastic coating material selected for the plastic outer layer includes nylon-11 with a melting temperature of 150° C. to 280° C.

4. The high oil content coated metal rope according to claim 1 or 2, characterized in that: The coated metal rope has a bending life of ≥200,000 times.

5. A method for preparing a high oil content coated metal rope, characterized in that: The following steps are involved: (1) preparing a core wire, and adding a first lubricating oil during the preparation process; (2) preparing a side wire, adding a second lubricating oil during the preparation process, and winding the side wire around the core wire after the preparation is completed to prepare 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 lubricant is 20°C to 30°C higher than the melting temperature of the plastic outer layer; and the flash point of the second lubricant is more than 50°C higher than the melting temperature of the plastic outer layer.

6. The method according to claim 5, characterized in that The step (1) comprises: spraying the first lubricating oil in a mist form onto a plurality of first sub-wires, and plying the plurality of first sub-wires to obtain the core wire.

7. The method according to claim 5, characterized in that The step (2) comprises: spraying the second lubricating oil in a mist form on a plurality of second sub-wires, plying the plurality of second sub-wires to obtain the side wires, and winding the side wires onto the core wire to obtain the metal rope.

8. The method according to claim 5, 6 or 7, characterized in that The step (3) comprises: forming the plastic outer layer continuously covering 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%.

9. An application of a high oil content coated metal rope, characterized in that: The invention relates to an application of a high-oil-content coated metal rope in the automotive field, wherein the high-oil-content coated metal rope is the high-oil-content coated metal rope according to any one of claims 1 to 4, or the high-oil-content coated metal rope is prepared according to the method according to any one of claims 5 to 8.

10. The use according to claim 9, characterized in that The application in the automotive field includes applying the high-oil-content coated metal rope to a driving mechanism of a vehicle side sliding door.

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