Steel wire rope for elevator

Abstract

The steel wire rope comprises a steel wire rope body and a core body, and the steel wire rope body comprises a steel wire rope outer layer and a steel wire rope middle layer; the core body comprises a core body oil storage assembly, and the core body oil storage assembly comprises a core body oil storage layer composed of an elastic assembly; and the core body wrapping layer wraps the core body oil storage layer, and an oil conveying channel penetrating through the core body wrapping layer is arranged on the core body wrapping layer. According to the structure, the strength and the supporting performance of the rope core are remarkably improved, and excessive overflow of grease in the rope core in the using process is effectively prevented. And meanwhile, the porous cylindrical ring body structure can realize slow release of grease, so that the steel wire rope strand is continuously and fully lubricated. In addition, the overall strength of the steel wire rope is effectively improved while the dead weight of the steel wire rope is reduced.

Description

Technical Field

[0001] This invention relates to elevator equipment, and more specifically to a steel wire rope that can be used in elevator systems. Background Technology

[0002] In elevator suspension systems, wire ropes are widely used as the traction medium. Grease is crucial for wire ropes, ensuring sufficient traction and reducing friction between strands, thus extending their service life. During manufacturing, most of the grease is stored in the core. If the core's support performance is poor, the grease is easily squeezed out during use, deteriorating and forming sludge, which can lead to elevator slippage and other malfunctions. Conversely, if the core's oil storage capacity is poor, the wire rope is prone to dry friction due to insufficient oil, resulting in dust and debris shedding, severely impacting elevator safety. Therefore, improving the support and oil storage performance of the wire rope core is a pressing issue.

[0003] Currently, research on steel wire rope cores mainly focuses on the application of new materials, structural functionalization, and process refinement. For example, CN202310767856.0 proposes a synthetic fiber core steel wire rope, which, although showing improved resistance to bending fatigue, suffers from poor core support, leading to easy extrusion of grease and problems such as oil shortage, flaking, and powdering. Another example is CN202511865360.2, which proposes a composite structure for oil-storing cores, but this still does not overcome the poor oil storage performance of artificial cores. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a steel wire rope for elevators that addresses the current issues of poor support, difficulty in oil storage, easy formation of sludge, powdering, and short lifespan in steel wire ropes. Elastomers are polymer materials with good uniformity and larger diameters, resulting in compactness and good support, making them suitable for rope cores. However, compared to fibers, they have difficulty storing oil, resulting in a harder rope core and higher stress in the core material.

[0005] To address the aforementioned problems, the present invention provides an elevator wire rope, comprising a wire rope body and a core, wherein the wire rope body comprises an outer wire rope layer and a middle wire rope layer; the core includes a core oil storage assembly, the core oil storage assembly comprising: The core oil reservoir is composed of elastic components; The core is encased in an oil storage layer, and an oil delivery channel is provided on the core encasing layer.

[0006] Preferably, the number of elastic components is at least one group, and each group of elastic components is formed by spirally twisting and rolling at least three elastic components.

[0007] Preferably, the material of the elastic component is modified ultra-high molecular weight polyethylene, which is obtained by chemically grafting lipophilic groups onto the fiber surface, and the lipophilic groups are long-chain alkane or polysiloxane segments.

[0008] Preferably, the material of the core wrapping layer is polyurethane elastomer, nitrile rubber, or polyimide.

[0009] Preferably, the twisting direction of the elastic component is opposite to the twisting direction of the outer layer and the middle layer of the wire rope.

[0010] Preferably, the wall thickness of the core wrapping layer is 1 / 4 to 1 / 5 of the core diameter, and the maximum thickness does not exceed 1.5 mm.

[0011] Preferably, the core oil storage assembly is a single set.

[0012] Preferably, the core oil storage assembly consists of at least two sets, with each assembly nested together sequentially.

[0013] Preferably, the core wrapping layer is a cylindrical ring structure with through holes, which are located in the axial or circumferential direction of the cylindrical ring structure.

[0014] Preferably, the inner diameter of the core wrapping layer and the outer diameter of the core oil storage layer are in a transitional fit.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The cylindrical ring structure of the core and the twisting and rolling of the elastic components increase the overall support performance of the rope core, improve the elastic modulus of the wire rope, and increase the wear resistance of the rope core.

[0016] The pores in the cylindrical ring structure of the core allow the grease in the rope core to be released slowly outward, reducing sludge problems caused by excessive oil release. It also avoids problems such as insufficient oil in the wire rope due to excessive oil release from the rope core, and increased friction between the strands and between the strands and the rope core, which can lead to powder and flaking problems.

[0017] The cylindrical ring structure of the core and the multi-layered, staggered wrapping of the elastic components increase the oil storage capacity of the rope core, further slowing down the oil seepage rate, increasing the overall rigidity of the rope core, and extending the service life of the wire rope. Meanwhile, assuming d is the diameter of the elastic component, D is the diameter of the pulley causing the wire rope to bend, σ is the stress, and E is the elastic modulus of the elastic body, the stress of the material under bending conditions can be approximately calculated as σ = d / D · E. The multi-layered structural design results in a smaller diameter of the elastic component, thus lower material stress and more flexible bending performance of the rope core, improving the bending fatigue life of the wire rope. Furthermore, the multi-layered structure results in finer, more widely distributed pores, which is more conducive to oil storage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the installation position of the elevator wire rope of the present invention in an elevator system with a suspension ratio of 1:1; Figure 2 This is a schematic diagram showing the installation position of the elevator wire rope of the present invention in an elevator system with a suspension ratio of 2:1; Figure 3 This is a schematic cross-sectional view of an elevator wire rope according to an embodiment of the present invention; Figure 4 This is a detailed cross-sectional schematic diagram of the core of an elevator wire rope according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the twisting and rolling process of an elastic component for an elevator wire rope according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the cylindrical ring structure of the core of an elevator wire rope according to an embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of a wire rope according to another embodiment of the present invention; Figure 8 This is a cross-sectional schematic diagram of the wire rope core according to another embodiment of the present invention.

[0019] The embodiments of the present invention are described below with reference to the accompanying drawings and specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Specific details are set forth in the following description to provide a thorough understanding of the present invention; however, the present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be based on different viewpoints and applications. Those skilled in the art can make various similar extensions and substitutions without departing from the spirit of the present invention. Detailed Implementation Specific Implementation Method 1

[0020] Figure 1 This is a schematic diagram of a traction elevator system 10 with a suspension ratio of 1:1. The system includes a car 11 and a corresponding counterweight 12. Both the car 11 and the counterweight 12 are directly connected to steel wire ropes 14. The traction sheave 16 of the traction machine 13 drives the steel wire ropes 14, completing the upward and downward movements of the car 11. The guide wheel 17 maintains the distance between the car 11 and the counterweight 12.

[0021] Figure 2This is a schematic diagram of another traction elevator system 20 with a suspension ratio of 2:1. The system includes a car 11 and a corresponding counterweight 12. The car 11 and counterweight 12 are suspended from steel wire ropes 14 via their respective anti-roll sheaves 18, with both ends of the steel wire ropes 14 fixed relative to space. The traction sheave 16 of the traction machine 13 drives the steel wire ropes 14, completing the upward and downward movements of the elevator car 11.

[0022] Figure 3 This is a cross-sectional schematic diagram of an elevator wire rope 14 according to the present invention. The elevator wire rope includes a wire rope body and a core. The wire rope body includes an outer layer, a middle layer, and a core. The outer layer includes eight outer wire strands 30, the middle layer includes six intermediate wire strands 40, and the core includes one core oil storage assembly 50. The eight outer wire strands 30 are evenly twisted around the six intermediate wire strands 40, and the six intermediate wire strands 40 are evenly twisted around the core oil storage assembly 50. The outer steel wire strand 30 consists of 9 outer steel wires 31, 9 middle steel wires 32, and 1 inner steel wire 33. The middle steel wire strand 40 consists of 6 outer steel wires 41 and 1 inner steel wire 42. Preferably, the strength grade of the steel wire rope is 1570 / 1960. The core oil storage assembly 50 includes a core oil storage layer and a core wrapping layer, which wraps around the core oil storage layer. In this embodiment, the core wrapping layer is a cylindrical annular structure 51, and the core oil storage layer is an elastic component 52. The inner diameter of the cylindrical annular structure 51 and the outer diameter of the elastic component 52 form a transition fit. The wall thickness of the cylindrical annular structure 51 is 1 / 4 to 1 / 5 of the diameter of the core oil storage assembly 50, with a maximum of 1.5 mm. Preferably, the material of the cylindrical annular structure 51 can be polyurethane elastomer, nitrile rubber, polyimide, etc. The elastic component 52 is made of modified ultra-high molecular weight polyethylene. Making it into a cylindrical shape improves the overall support performance of the rope core. In order to increase the oil storage performance of the elastic component 52, lipophilic groups such as long-chain alkanes or polysiloxane segments can be linked to the ultra-high molecular weight polyethylene monomer through chemical grafting technology. The lipophilic groups can effectively lock in oils.

[0023] Figure 4 This is a detailed cross-sectional schematic diagram of a wire rope core oil storage assembly 50 according to the present invention. The core oil storage layer is composed of elastic components. The elastic components 52 are formed by twisting and rolling three cylindrical elastic bodies 521. If the twisting direction of the outer strand 30 and the middle strand 40 of the wire rope 14 is right-hand twist, then the twisting direction of the elastic components 52 is opposite to that direction, i.e., left-hand twist. This structure is stable, balances torque, resists rotation, and prevents the wire rope from loosening.

[0024] Figure 5This is a schematic diagram of the twisting and rolling of the elastic component 52 of a steel wire rope 14 according to the present invention. After twisting and rolling, the cylindrical elastic body 521 is extruded into three fan-shaped bodies, which are more tightly integrated with the cylindrical ring structure 51.

[0025] Figure 6 This is a schematic diagram of the cylindrical ring structure 51 of the core oil storage assembly 50 of the wire rope 14 according to the present invention. The cylindrical ring structure 51 encloses the elastic assembly 52, which improves the support performance of the rope core. During elevator operation, when the wire rope 14 comes into contact with the traction sheave 16 or the anti-roll sheave 18, it is less likely to cause excessive leakage of grease inside the wire rope 14 due to excessive compression. The cylindrical ring structure 51 has evenly distributed through-holes 511, which are linearly arrayed in the axial direction and circularly arrayed in the circumferential direction. The grease stored in the elastic assembly 52 slowly lubricates the wire rope strands through the through-holes 511 on the cylindrical ring structure 51, reducing wear between the wires. At the same time, the through-holes 511 are small, so that the grease is less likely to overflow excessively from the rope core, causing the wire rope to suffer from insufficient oil and aggravated wear, thus extending the service life of the wire rope. Specific Implementation Method Two

[0026] Figure 7 This is a cross-sectional schematic diagram of another type of wire rope 14 according to the present invention. Unlike embodiment one, the core 60 consists of four layers. The outermost layer is the core wrapping layer, which is the first cylindrical annular structure 61. From the outside in, the second layer is the core oil storage layer, which in this embodiment is a twisted structure 62 of multiple elastic components arranged in a ring array. The third layer is the core wrapping layer, which is the second cylindrical annular structure 63. The fourth layer is the core oil storage layer, i.e., an independent elastic component 64. The inner diameter of the first cylindrical annular structure 61 and the outer diameter of the twisted structure 62 of the multiple elastic components form a transition fit. The inner diameter of the twisted structure 62 of the multiple elastic components and the outer diameter of the second cylindrical annular structure 63 form a transition fit. The inner diameter of the second cylindrical annular structure 63 and the outer diameter of the innermost elastic component 64 form a transition fit. The sum of the wall thicknesses of the first cylindrical annular structure 61 and the second cylindrical annular structure 63 is 1 / 5 of the diameter of the core 60, and does not exceed 1.5 mm. Preferably, the materials of the first cylindrical ring structure 61 and the second cylindrical ring structure 63 can be polyurethane elastomer, nitrile rubber, polyimide, etc. The materials of the elastic components 621 and 64 are modified ultra-high molecular weight polyethylene materials. Making them cylindrical improves the overall support performance of the rope core. In order to increase the oil storage performance of the elastic components 621 and 64, lipophilic groups such as long-chain alkanes or polysiloxane segments can be linked to the ultra-high molecular weight polyethylene monomers through chemical grafting technology. The lipophilic groups can effectively retain oils.

[0027] Figure 8This is a cross-sectional schematic diagram of the core 60 of another type of steel wire rope 14 according to the present invention. The twisting structure 62 of multiple elastic components is formed by twisting and rolling 10 first elastic components 621 in a ring array, and each first elastic component 621 is formed by twisting and rolling 3 first cylindrical elastic bodies 6211. The innermost elastic component 64 is formed by twisting and pressing 3 second cylindrical elastic bodies 641. The twisting direction of the first elastic component 621 in the twisting structure 62 of multiple elastic components is opposite to the twisting direction of the outer layer steel wire strands 30 and the middle steel wire strands 40 of the wire rope 14. The twisting direction of the first elastic component 621 in the twisting structure 62 of multiple elastic components is opposite to the twisting direction of the second cylindrical elastic body 641 of the innermost elastic component 64. The twisting direction of the first elastic component 621 in the twisting structure 62 of multiple elastic components is opposite to the twisting direction of the first cylindrical sub-elastic body 6211. If the twisting direction of the outer layer steel wire strands 30 and the middle layer steel wire strands 40 of the wire rope 14 is right-hand twist, then the twisting direction of the first elastic component 621 in the twisting structure 62 of multiple elastic components is left-hand twist, the twisting direction of the first cylindrical sub-elastic body 6211 is right-hand twist, and the twisting direction of the second cylindrical elastic body 641 of the innermost elastic component 64 is right-hand twist. This structure is stable, balances torque, resists rotation, and prevents the wire rope from loosening. The first cylindrical ring structure 61 and the second cylindrical ring structure 63 have the same structure as the cylindrical ring structure 51 in Embodiment 1. They have circumferentially arrayed through holes on their sides to ensure that the grease stored in the rope core slowly seeps out, providing long-term and continuous lubrication to the wire rope 14. Of course, the through holes can also be replaced with through grooves. This multi-layered, nested ring design increases the support performance of the rope core, making it less likely for the grease in the rope core to be squeezed out in large quantities, causing the wire rope to lack oil. At the same time, the multi-layered distribution of the elastic components makes the inner diameter of each cylindrical elastic body smaller, reducing stress and increasing the overall strength of the rope core.

[0028] The present invention has been described in detail above through specific embodiments. These embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-described implementation methods. Equivalent substitutions and improvements made by those skilled in the art without departing from the principles of the present invention should be considered within the scope of the technology protected by the present invention.

Claims

1. A steel wire rope for elevators, characterized in that, The elevator wire rope includes a wire rope body and a core. The wire rope body includes an outer layer and a middle layer. The core includes a core oil storage assembly, which includes: The core oil reservoir is composed of elastic components; The core is encased in an oil storage layer, and an oil delivery channel is provided on the core encasing layer.

2. The elevator wire rope according to claim 1, characterized in that, The number of elastic components is at least one set, and each set of elastic components is formed by spirally twisting and rolling at least three cylindrical elastomers.

3. The elevator wire rope according to claim 1, characterized in that, The elastic component is made of modified ultra-high molecular weight polyethylene. The modified ultra-high molecular weight polyethylene is obtained by chemical grafting technology to link lipophilic groups to the fiber surface. The lipophilic groups are long-chain alkane or polysiloxane segments.

4. The elevator wire rope according to claim 1, characterized in that, The core wrapping layer is made of polyurethane elastomer, nitrile rubber, or polyimide.

5. The elevator wire rope according to claim 1, characterized in that, The twisting direction of the elastic component is opposite to the twisting direction of the outer layer and the middle layer of the wire rope.

6. The elevator wire rope according to claim 1, characterized in that, The wall thickness of the core wrapping layer is 1 / 4 to 1 / 5 of the core diameter, with a maximum thickness not exceeding 1.5 mm.

7. The elevator wire rope as described in claim 1, characterized in that, The core oil storage assembly consists of one set.

8. The elevator wire rope as described in claim 1, characterized in that, The core oil storage assembly consists of at least two sets, with each assembly nested together sequentially.

9. The elevator wire rope as described in claim 7, characterized in that, The core wrapping layer is a cylindrical ring structure with through holes, which are located in the axial or circumferential direction of the cylindrical ring structure.

10. The wire rope as described in claim 9, characterized in that, The tolerance fit between the inner diameter of the core wrapping layer and the outer diameter of the core oil storage layer is a transition fit.

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