Steel wire rope for main lifting of large-tonnage crawler crane

Abstract

The utility model discloses a steel wire rope for main hoisting of a large-tonnage crawler crane, and belongs to the technical field of steel wire ropes. The steel wire rope for main lifting of the large-tonnage crawler crane comprises an inner strand, six outer strands are twisted outside the inner strand at equal intervals, the twisting direction of the six outer strands is right, the outer walls of the six outer strands are fixedly sleeved with a protective layer, the protective layer is made of a high-density polyethylene material, a first filling layer is arranged inside the protective layer, and a second filling layer is arranged inside the first filling layer. Due to the fact that the protective layer is made of the high-density polyethylene material, the steel wire rope has extremely high chemical corrosion resistance, meanwhile, the abrasion resistance of the steel wire rope is improved, the service life of the steel wire rope is prolonged, the inner-layer wires and the outer-layer wires are manganese-series phosphating abrasion-resistant coating steel wires, the storage amount of lubricating grease on the surface of the steel wire rope can be increased through the porous structure of the phosphating coatings, and the service life of the steel wire rope is prolonged. The friction factor is reduced, and sliding is promoted, so that micro-motion damage and fatigue micro-crack initiation on the surface of the steel wire are delayed, and the anti-fatigue effect is achieved.

Description

Technical Field

[0001] This application relates to the technical field of wire ropes, specifically to wire ropes for the main hoist of large-tonnage crawler cranes. Background Art

[0002] The wire rope for the main hoist of large-tonnage crawler cranes is a special wire rope designed specifically to meet the requirements of large-scale lifting operations. It usually has characteristics such as high strength, high wear resistance, high fatigue resistance, and excellent impact toughness to adapt to the heavy load and long-time working requirements.

[0003] A patent with the publication number CN219342683U discloses a new type of hoisting rope for large-tonnage crawler cranes, including an inner layer rope. An outer layer rope is provided on the outer wall of the inner layer rope, and a filling layer is provided between the inner layer rope and the outer layer rope; the filling layer includes filling strands. This application relates to the technical field of wire ropes. For this new type of hoisting rope for large-tonnage crawler cranes, through the cooperation between the central strand, the inner strands, and the filling strands, a wire rope with high breaking force, strong anti-rotation property, small diameter tolerance, and good use safety is formed. When the diameter of the wire rope of this structure is 26 mm, it is used as the main hoist wire rope and the auxiliary hoist wire rope in crawler cranes ZCC2000, ZCC1800H / ZCC2000-1. The breaking force of the whole rope reaches 652 KN, which is 20% higher than the national standard of 543 KN, reaching the international advanced level. It has replaced imported wire ropes of the same kind, realized the localization of wire ropes used in crawler cranes, and at the same time driven the development of the wire rope industry, more safely and effectively ensuring the development of the wind power generation industry.

[0004] However, the above technical solution has the following defects:

[0005] (1) In the hoisting operation environment of large tonnage, the load-bearing capacity of the wire rope may not meet the high-strength requirements of the main hoist of large-tonnage crawler cranes. During heavy load or long-time work, fracture or failure may occur. Such fracture or failure may occur during the hoisting process, posing a serious threat to the operators and the surrounding environment. In the main hoist operation of large-tonnage crawler cranes, the wire rope needs to bear repeated bending and stretching, and has high requirements for its fatigue resistance. The wire rope may not meet this requirement and is prone to fatigue fracture.

[0006] (2) At the same time, in the main hoist operation of large-tonnage crawler cranes, frequent friction will occur between the wire rope and components such as pulleys and drums. The wear resistance of the wire rope may be poor, easily leading to excessive wear of the wire rope, thereby affecting the service life and operation efficiency. Summary of the Utility Model

[0007] One object of this application is to: improve the load-bearing capacity and fatigue resistance of the wire rope so that it can be stably used in the main hoist operation of large-tonnage crawler cranes.

[0008] To achieve the above object, the technical solution adopted in this application is as follows: The steel wire rope for the main hoist of a large-tonnage crawler crane includes inner-stranded strands, and six outer-stranded strands are stranded at equal intervals outside the inner-stranded strands, and the lay direction of the six outer-stranded strands is right lay.

[0009] Preferably, a protective layer is fixedly sleeved on the outer walls of the six outer-stranded strands, and the protective layer is made of high-density polyethylene material.

[0010] Preferably, a first filling layer is arranged inside the protective layer. The first filling layer is made of ceramic fiber material, and lubricating grease is mixed inside the first filling layer.

[0011] Preferably, the inner-stranded strand includes an inner core and outer cores. The number of the outer cores is six, and the outer cores are stranded at equal intervals outside the inner core, and the lay direction of the outer cores is right lay. The six outer cores are all made of low-carbon steel wire, the inner core is made of asbestos, and lubricating oil is impregnated inside the inner core.

[0012] Preferably, the outer-stranded strand includes a core, inner layer wires are stranded outside the core, and outer layer wires are stranded outside the inner layer wires. Both the inner layer wires and the outer layer wires are manganese-phosphating wear-resistant coating steel wires.

[0013] Preferably, the number of both the inner layer wires and the outer layer wires is six, and the lay direction of both the inner layer wires and the outer layer wires is right lay. The diameter of the inner layer wires is smaller than that of the outer layer wires, and the outer layer wires are evenly distributed in the grooves between two adjacent inner layer wires.

[0014] Preferably, wear-resistant layers are fixedly sleeved on the outsides of both the inner-stranded strands and the outer-stranded strands. The wear-resistant layers are made of epoxy resin material, and a second filling layer is arranged inside the wear-resistant layers. The second filling layer is made of PVC plastic material.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] Since the protective layer is made of high-density polyethylene material, the steel wire rope has extremely strong chemical corrosion resistance, and at the same time improves its wear resistance, thereby prolonging the service life of the steel wire rope. Both the inner layer wires and the outer layer wires are manganese-phosphating wear-resistant coating steel wires. The porous structure of the phosphating coating can increase the storage amount of lubricating grease on the surface of the wire ropes for making ropes, reduce the friction coefficient, promote sliding, thereby delaying the fretting damage on the surface of the steel wires and the initiation of fatigue microcracks, and thus achieving the anti-fatigue effect.

[0017] Due to the influence of the epoxy resin material of the wear-resistant layer, the frictional loss between the outer twisted strands can be reduced, and the service life of the wire rope can be extended. At the same time, it can effectively fill between the inner strands and the outer strands of the wire rope, providing additional support and shaping effects. Through the function of the PVC plastic in the second filling layer, the diameter of the wire rope can be stabilized, the overall rigidity of the wire rope can be enhanced, and the corrosion resistance and durability of the wire rope can also be improved, while reducing the wear between the inner wires and the outer wires. Brief Description of the Drawings

[0018] Figure 1 A front view three-dimensional schematic diagram of the whole proposed by the present utility model;

[0019] Figure 2 A three-dimensional schematic diagram of the inner twisted strand proposed by the present utility model;

[0020] Figure 3 A three-dimensional schematic diagram of the outer twisted strand proposed by the present utility model.

[0021] In the figure: 1, inner twisted strand; 11, inner strand core; 12, outer strand core; 2, outer twisted strand; 21, rope core; 22, inner layer wire; 23, outer layer wire; 3, first filling layer; 4, protective layer; 5, second filling layer; 6, wear-resistant layer. Detailed Embodiment

[0022] Next, in combination with the detailed embodiment, the present application will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0023] In the description of the present application, it should be noted that for the orientation terms, if there are terms such as "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and position relationships indicated are based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0025] The terms "comprising" and "having" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0026] The prior art has the following defects:

[0027] (1) In the hoisting operation environment of large-tonnage cranes, the load-bearing capacity of the steel wire rope may not meet the high-intensity requirements of the main hoist of large-tonnage crawler cranes. During heavy-duty or long-term operation, the steel wire rope may break or fail. Such breakage or failure may occur during the hoisting process, posing a serious threat to the operators and the surrounding environment. In the main hoist operation of large-tonnage crawler cranes, the steel wire rope needs to withstand repeated bending and stretching, requiring high fatigue resistance. The steel wire rope may not meet this requirement and is prone to fatigue fracture.

[0028] (2) At the same time, during the main hoist operation of large-tonnage crawler cranes, frequent friction occurs between the steel wire rope and components such as pulleys and drums. The wear resistance of the steel wire rope may be poor, easily leading to excessive wear of the steel wire rope, thereby affecting its service life and operation efficiency.

[0029] As an improvement, as Figures 1 to 3 shown, the preferred embodiment of this application is:

[0030] The steel wire rope for the main hoist of large-tonnage crawler cranes includes an inner-strand 1, and six outer-strands 2 are equally spaced and twisted outside the inner-strand 1. The twisting directions of the six outer-strands 2 are all right-twist.

[0031] As Figure 1 shown, in this embodiment, a protective layer 4 is fixedly sleeved on the outer wall of the six outer-strands 2. The protective layer 4 is made of high-density polyethylene material. A first filling layer 3 is provided inside the protective layer 4. The first filling layer 3 is made of ceramic fiber material, and lubricating grease is mixed inside the first filling layer 3.

[0032] Specifically, because the protective layer 4 is made of high-density polyethylene material, it has extremely strong chemical corrosion resistance and can resist the erosion of various chemical substances such as acids, alkalis, and solvents. This enables it to maintain its stable performance in various corrosive environments. At the same time, it has good wear resistance, can resist friction and wear, and extends the service life of the steel wire rope. Since high-density polyethylene material can resist the effects of ultraviolet rays, oxidation, and different climate conditions, the steel wire rope can be used outdoors and exposed to the natural environment for a long time. Moreover, high-density polyethylene material is easy to process, making the production and processing of the steel wire rope more convenient.

[0033] [[ID=Figure 2 As shown, in this embodiment, the inner stranded wire 1 includes an inner wire core 11 and an outer wire core 12. The number of the outer wire cores 12 is six. The outer wire cores 12 are stranded around the outside of the inner wire core 11 at equal intervals, and the lay direction of the outer wire cores 12 is right lay. All six outer wire cores 12 are made of low-carbon steel wire, the inner wire core 11 is made of asbestos, and lubricating oil is impregnated inside the inner wire core 11.

[0034] Specifically, since the whole outer wire core 12 is right lay, the steel wire rope as a whole has the characteristics of creep resistance and explosion protection. Since the inner wire core is made of asbestos and contains lubricating oil, it can reduce the damage caused by the mutual friction between the outer wire cores 12, thereby extending the service life of the inner stranded wire 1.

[0035] As Figure 3 shown, in this embodiment, the outer stranded wire 2 includes a wire core 21. Inner layer wires 22 are stranded around the outside of the wire core 21, and outer layer wires 23 are stranded around the outside of the inner layer wires 22. Both the inner layer wires 22 and the outer layer wires 23 are manganese-based phosphating wear-resistant coating steel wires. The number of both the inner layer wires 22 and the outer layer wires 23 is six, and the lay direction of both the inner layer wires 22 and the outer layer wires 23 is right lay. The diameter of the inner layer wires 22 is smaller than that of the outer layer wires 23, and the outer layer wires 23 are evenly distributed in the grooves between two adjacent inner layer wires 22.

[0036] Specifically, since both the inner layer wires 22 and the outer layer wires 23 are manganese-based phosphating wear-resistant coating steel wires, through special phosphating treatment, a layer of phosphide film can be formed on the surface of the steel wire. The porous structure of the phosphating film can increase the storage amount of lubricating grease on the surface of the wire ropes, reduce the friction coefficient, promote sliding, thereby delaying the fretting damage on the surface of the steel wire and the initiation of fatigue microcracks, and further achieving the anti-fatigue effect. At the same time, the inner layer wires 22 and the outer layer wires 23 together form a Lang lay type wire contact steel wire rope structure, so that the steel wire rope has a higher load-bearing capacity and can withstand greater tensile force.

[0037] As Figure 2 and Figure 3 shown, in this embodiment, wear-resistant layers 6 are fixedly sleeved on the outside of both the inner stranded wire 1 and the outer stranded wire 2. The wear-resistant layers 6 are made of epoxy resin material, and a second filling layer 5 is arranged inside the wear-resistant layers 6. The second filling layer 5 is made of PVC plastic material.

[0038] Specifically, due to the influence of the epoxy resin material of the wear-resistant layer 6, the friction loss between the outer stranded wires 2 can be reduced, and the service life of the steel wire rope can be extended. At the same time, the epoxy resin material has excellent physical and mechanical properties and chemical stability, and can effectively fill between the inner strands and the outer strands of the steel wire rope, providing additional support and shaping effect. Through the action of the PVC plastic in the second filling layer 5, the diameter of the steel wire rope can be stabilized, the overall rigidity of the steel wire rope can be enhanced, and the corrosion resistance and durability of the steel wire rope can also be improved. At the same time, the wear between the inner layer wires 22 and the outer layer wires 23 can be reduced.

[0039] The working principle of this application is as follows:

[0040] When the staff uses this steel wire rope for the main hoisting of a large-tonnage crawler crane, since the protective layer 4 is made of high-density polyethylene material, it has extremely strong chemical corrosion resistance and can resist the erosion of various chemical substances such as acids, alkalis, and solvents. This enables it to maintain its stable performance in various corrosive environments. At the same time, it has good wear resistance, can resist friction and abrasion, and extend the service life of the steel wire rope. Because the high-density polyethylene material can resist the influence of ultraviolet rays, oxidation, and different climatic conditions, the steel wire rope can be used outdoors and exposed to the natural environment for a long time. Moreover, the high-density polyethylene material is easy to process, making the production and processing of the steel wire rope more convenient;

[0041] Since the outer strand core 12 is right-twisted as a whole, the steel wire rope as a whole has the characteristics of creep resistance and explosion protection. Since the inner strand core is made of asbestos material and contains lubricating oil, it can reduce the damage caused by the mutual friction between the outer strand cores 12, thereby extending the service life of the inner-twisted strands 1;

[0042] Since both the inner layer wires 22 and the outer layer wires 23 are manganese-based phosphating wear-resistant coating steel wires, through special phosphating treatment, a phosphide film can be formed on the surface of the steel wires. The porous structure of the phosphating film can increase the storage amount of lubricating grease on the surface of the wire ropes, reduce the friction coefficient, promote sliding, thereby delaying the initiation of fretting damage and fatigue microcracks on the surface of the steel wires, and thus achieving the effect of anti-fatigue. At the same time, the inner layer wires 22 and the outer layer wires 23 together form a Seale-type wire contact type steel wire rope structure, thereby enabling the steel wire rope to have a higher load-bearing capacity and be able to withstand greater tensile forces;

[0043] Due to the influence of the epoxy resin material of the wear-resistant layer 6, the friction loss between the outer-twisted strands 2 can be reduced, and the service life of the steel wire rope can be extended. At the same time, the epoxy resin material has excellent physical and mechanical properties and chemical stability, and can effectively fill between the inner and outer strands of the steel wire rope, providing additional support and shaping effects. Through the action of the PVC plastic in the filling layer two 5, the diameter of the steel wire rope can be stabilized, the overall rigidity of the steel wire rope can be enhanced, and the corrosion resistance and durability of the steel wire rope can also be improved. At the same time, the wear between the inner layer wires 22 and the outer layer wires 23 can be reduced.

[0044] The above describes the basic principle, main features, and advantages of this application. Those skilled in the art of this industry should understand that this application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed. The scope of protection required by this application is defined by the appended claims and their equivalents.

Claims

1. The steel wire rope for the main hoist of a large-tonnage crawler crane is characterized in that It includes an inner twisted strand (1), and six outer twisted strands (2) are twisted around the outside of the inner twisted strand (1) at equal intervals. The twisting directions of the six outer twisted strands (2) are all right-twist.

2. The steel wire rope for the main hoist of the large-tonnage crawler crane according to claim 1, characterized in that, A protective layer (4) is fixedly sleeved on the outer walls of the six outer twisted strands (2). The protective layer (4) is made of high-density polyethylene material.

3. The steel wire rope for the main hoist of a large-tonnage crawler crane according to claim 2, characterized in that, A first filling layer (3) is arranged inside the protective layer (4). The first filling layer (3) is made of ceramic fiber material, and lubricating grease is mixed inside the first filling layer (3).

4. The wire rope for the main hoist of a large-tonnage crawler crane as described in claim 1, wherein, The inner twisted strand (1) includes an inner core (11) and an outer core (12). The number of the outer cores (12) is six. The outer cores (12) are twisted around the outside of the inner core (11) at equal intervals, and the twisting direction of the outer cores (12) is right-twist. The six outer cores (12) are all made of low-carbon steel wire, and the inner core (11) is made of asbestos material. Lubricating oil is impregnated inside the inner core (11).

5. The steel wire rope for the main hoist of a large-tonnage crawler crane as described in claim 1, characterized in that, The outer twisted strand (2) includes a core (21). An inner layer of wires (22) is twisted around the outside of the core (21), and an outer layer of wires (23) is twisted around the outside of the inner layer of wires (22). The inner layer of wires (22) and the outer layer of wires (23) are both manganese-based phosphating wear-resistant coating steel wires.

6. The steel wire rope for the main hoist of a large-tonnage crawler crane as described in claim 5, characterized in that, The number of the inner layer of wires (22) and the outer layer of wires (23) is six, and the twisting directions of the inner layer of wires (22) and the outer layer of wires (23) are both right-twist. The diameter of the inner layer of wires (22) is smaller than that of the outer layer of wires (23). The outer layer of wires (23) is evenly distributed in the grooves between two adjacent inner layers of wires (22).

7. The wire rope for the main hoist of a large-tonnage crawler crane as described in claim 1, characterized in that, A wear-resistant layer (6) is fixedly sleeved on the outside of the inner twisted strand (1) and the outer twisted strands (2). The wear-resistant layer (6) is made of epoxy resin material. A second filling layer (5) is arranged inside the wear-resistant layer (6). The second filling layer (5) is made of PVC plastic material.

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