Impact-resistant and rotation-resistant galvanized steel wire rope for ocean engineering crane

Abstract

The impact-resistant and rotation-resistant galvanized steel wire rope for the ocean engineering crane comprises an inner-layer steel wire rope center strand, an inner-layer strand is arranged on the outer circumference of the inner-layer steel wire rope center strand, and a plurality of steel wire rope outer-layer strands are evenly arranged on the outer circumference of the inner-layer strand. The space between the inner-layer steel wire rope center strand and the inner-layer strands and the space between the inner-layer strands and the steel wire rope outer-layer strands are filled with solid polymers. According to the steel wire rope, the problems of twisting and bottom layer crushing in the use process of a large-specification maritime work crane steel wire rope are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel wire ropes, and in particular relates to an impact-resistant and rotation-resistant galvanized steel wire rope for an ocean engineering crane. Background Art

[0002] In recent years, the offshore crane industry has developed rapidly, with the exploitation of two major oil and wind resources, offshore oil and offshore wind power. At present, it has gradually begun to involve the field of offshore wind power generation. The offshore wind power industry has been highly valued for its green energy-saving, low-carbon and environmentally friendly concepts. The demand for wind power ship crane wire ropes that have been bred has increased, and the performance requirements for offshore crane wire ropes have become higher and higher. The offshore large-tonnage crane market of more than 1,500 tons has product characteristics such as thick diameter, extra-long and extra-heavy, and corrosion resistance. The product positioning is high, the wire rope diameter ranges from 40mm-80mm, and the single-rod length is 1200m-7500m. It is divided into main lifting wire ropes and variable-length wire ropes. Most of them are multi-layer wire ropes. At present, most of them use imported Imported steel wire ropes, while domestic offshore crane steel wire ropes are still in the stage of research and development and sea trials. The existing problems and areas that need improvement are as follows: 1) Traditional 6-strand and 8-strand crane steel wire ropes have poor torsion resistance and are prone to twisting; 2) Poor crush resistance and small metal filling coefficient. Since the offshore crane steel wire rope winding method is multi-layer winding of the lebus drum, the traditional 6-strand and 8-strand crane steel wire ropes have a small metal filling coefficient. The steel wire ropes at the bottom of the drum are prone to surface crushing and deformation, which affects the arrangement of the upper steel wire ropes and causes the steel wire ropes to be unable to be reeled normally. Therefore, it is urgent to invent an impact-resistant and rotation-resistant galvanized steel wire rope for offshore engineering cranes. Summary of the invention

[0003] The purpose of the present invention is to provide an impact-resistant and rotation-resistant galvanized steel wire rope for an offshore engineering crane, so as to solve the problems of twisting and bottom layer crushing of large-sized offshore crane steel wire ropes during use.

[0004] The technical solution adopted by the present invention is that the impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering cranes includes an inner steel wire rope center strand, an inner layer strand is arranged on the outer circumference of the inner steel wire rope center strand, a plurality of steel wire rope outer layer strands are evenly arranged on the outer circumference of the inner layer strand, and solid polymers are filled between the inner steel wire rope center strand and the inner layer strand, and between the inner layer strand and the outer layer strand.

[0005] The present invention is also characterized in that:

[0006] The inner strands include a plurality of inner strands of inner steel wire ropes, which are evenly arranged along the outer circumference of the inner steel wire rope center strand and each inner strand of the inner steel wire rope is in contact with the inner steel wire rope center strand, and a secondary outer strand is arranged along the outer circumference of a circle formed by the plurality of inner strands of the inner steel wire ropes.

[0007] The secondary outer strands include a plurality of inner layer steel wire rope secondary outer large strands and a plurality of inner layer steel wire rope secondary outer small strands. The plurality of inner layer steel wire rope secondary outer large strands and the plurality of inner layer steel wire rope secondary outer small strands are arranged at intervals. Each inner layer steel wire rope secondary outer large strand is in contact with its adjacent inner layer steel wire rope inner strand, and each inner layer steel wire rope secondary outer small strand is in contact with its adjacent inner layer steel wire rope inner strand.

[0008] The structures of the inner steel wire rope center strand, the inner steel wire rope inner strand, the inner steel wire rope second outer large strand, the inner steel wire rope second outer small strand and the steel wire rope outer strand are consistent, all of which include a central steel wire. A number of outer steel wires are evenly arranged on the outer circumference of the central steel wire, and the surfaces of the central steel wire and the outer steel wire are galvanized.

[0009] The structures of the inner steel wire rope center strand, the inner steel wire rope inner strand, the inner steel wire rope sub-outer large strand, the inner steel wire rope sub-outer small strand and the steel wire rope outer strand are consistent, all including a central steel wire, a plurality of intermediate steel wires are evenly arranged on the outer circumference of the central steel wire, a plurality of outer steel wires are evenly arranged along the outer circumference of the circle formed by the plurality of intermediate steel wires, and the surfaces of the central steel wire, the intermediate steel wire and the outer steel wire are all galvanized.

[0010] The number of steel wires in the center strand of the inner wire rope, the inner strand of the inner wire rope, the second outer large strand of the inner wire rope, the second outer small strand of the inner wire rope and the outer strand of the wire rope shall not be less than 7.

[0011] A plurality of inner strands of inner steel wire rope, a plurality of large second-outer strands of inner steel wire rope, a plurality of small second-outer strands of inner steel wire rope and a plurality of outer strands of steel wire rope are all uniformly twisted in sequence around the center strand of the inner steel wire rope and are all compacted strands.

[0012] The number of outer strands of the wire rope shall not be less than 10.

[0013] The beneficial effects of the present invention are as follows: the present invention is an impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering cranes, with a diameter range of 40mm-80mm, a single thick-diameter extra-long steel wire rope with a service length of 1200m-7500m, and a steel wire rope strength level of 1960MPa and above. Each strand in the steel wire rope adopts a compaction process, and has a high breaking tensile force and a safety factor for use; the surface of the steel wire is treated with a galvanized layer, and has strong corrosion resistance; the interior of the steel wire rope is filled with solid polymers to improve the impact resistance and crush resistance of the steel wire rope, and through a reasonable ratio of the twist angles of the inner and outer layers of the steel wire rope and parameter design, the torque coefficient is less than or equal to 0.014, and the anti-rotation performance is excellent; it is mainly used for lifting and luffing steel wire ropes for marine engineering ship cranes, and meets the needs of research and development and manufacturing of large-tonnage marine workboats. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of Example 4 of the present invention.

[0017] In the figure, 1. the center strand of the inner layer steel wire rope, 2. the inner layer strands of the inner layer steel wire rope, 3. the second outer layer large strands of the inner layer steel wire rope, 4. the second outer layer small strands of the inner layer steel wire rope, 5. the outer layer strands of the wire rope, 6. the solid polymer, 7. the center steel wire, 8. the outer layer steel wire, 9. the middle layer steel wire. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1

[0020] The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane of the present invention comprises an inner steel wire rope center strand 1, an inner strand is arranged on the outer circumference of the inner steel wire rope center strand 1, and a plurality of steel wire rope outer strands 5 are evenly arranged on the outer circumference of the inner strand. The inner steel wire rope center strand 1 and the inner strand, and the inner strand and the steel wire rope outer strand 5 are filled with solid polymers, allowing the solid polymers to be squeezed out from the gaps of the steel wire rope outer strands. The solid polymers can be selected from ethylene and propylene, which are heated and molten and injected into the steel wire rope to achieve a plastic filling effect. The number of steel wire rope outer strands 5 is not less than 10. The steel wire rope material of the present invention is high carbon steel, such as 82B, 87Mn and other materials. The surface of the steel wire used for twisting the steel wire rope is galvanized. The coating type can be divided into pure zinc coating or zinc-aluminum alloy coating. The galvanizing process can be divided into hot-dip galvanizing and electro-galvanizing. The steel wire rope of the present invention can be twisted once or multiple times.

[0021] The inner strands include a plurality of inner steel wire rope inner strands 2, which are evenly arranged along the outer circumference of the inner steel wire rope center strand 1 and each inner steel wire rope inner strand 2 is in contact with the inner steel wire rope center strand 1, and a secondary outer strand is arranged along the outer circumference of the circle formed by the plurality of inner steel wire rope inner strands 2.

[0022] The secondary outer strands include a plurality of inner layer steel wire rope secondary outer large strands 3 and a plurality of inner layer steel wire rope secondary outer small strands 4, the plurality of inner layer steel wire rope secondary outer large strands 3 are arranged at intervals from the plurality of inner layer steel wire rope secondary outer small strands 4, each inner layer steel wire rope secondary outer large strand 3 is in contact with its adjacent inner layer steel wire rope inner layer strand 2, each inner layer steel wire rope secondary outer small strand 4 is in contact with its adjacent inner layer steel wire rope inner layer strand 2, the space between the inner layer steel wire rope central strand 1 and the inner layer steel wire rope inner layer strand 2, the space between the inner layer steel wire rope inner layer strand 2 and the inner layer steel wire rope secondary outer large strands 3, the space between the inner layer steel wire rope secondary outer large strands 3 and the inner layer steel wire rope secondary outer small strands 4, and the space between the inner layer steel wire rope secondary outer small strands 4 and the steel wire rope outer strands 5 are all filled with solid polymers, that is, except for a plurality of steel wire rope outer layer strands 5, the remaining strands are all filled with solid polymers.

[0023] The structures of the inner steel wire rope center strand 1, the inner steel wire rope inner strand 2, the inner steel wire rope sub-outer large strand 3, the inner steel wire rope sub-outer small strand 4 and the steel wire rope outer strand 5 are consistent, all including a central steel wire 7, and a plurality of outer steel wires 8 are evenly arranged on the outer circumference of the central steel wire 7.

[0024] The structures of the inner steel wire rope center strand 1, the inner steel wire rope inner strand 2, the inner steel wire rope sub-outer large strand 3, the inner steel wire rope sub-outer small strand 4 and the steel wire rope outer strand 5 are consistent, all including a central steel wire 7, a plurality of intermediate steel wires 9 are evenly arranged on the outer circumference of the central steel wire 7, and a plurality of outer steel wires 8 are evenly arranged along the outer circumference of the circle formed by the plurality of intermediate steel wires 9.

[0025] The number of steel wires of the inner steel wire rope center strand 1, the inner steel wire rope inner strand 2, the inner steel wire rope second outer large strand 3, the inner steel wire rope second outer small strand 4 and the steel wire rope outer strand 5 shall not be less than 7, and the structure may be K(1+6), K(1+9+9) or others.

[0026] A plurality of inner strands 2 of inner steel wire rope, a plurality of second outer large strands 3 of inner steel wire rope, a plurality of second outer small strands 4 of inner steel wire rope and a plurality of outer strands 5 of steel wire rope are all uniformly twisted in sequence around the inner steel wire rope center strand 1 and are all compacted strands.

[0027] The strength level of the wire rope is 1960MPa and above. The strength level of the steel wire in the wire rope is determined according to the strength level of the wire rope. The steel wire strength level is selected to be the same as or adjacent to the strength level of the wire rope. For example, for a 1960MPa grade wire rope, the wire strength level can be selected to be 1870MPa, 1960MPa and 2160MPa; the wire rope has excellent anti-rotation performance, and the measured wire rope torque coefficient is less than or equal to 0.014; the lubricating grease for the wire rope should have excellent anti-corrosion performance, not be affected by water-soluble corrosive acids, and have good lubricity.

[0028] Example 2

[0029] The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane of the present invention has a structure as follows Figure 1 As shown, it includes 1 inner layer steel wire rope center strand 1, 6 inner layer steel wire rope inner layer strands 2, 6 inner layer steel wire rope sub-outer layer large strands 3, 6 inner layer steel wire rope sub-outer layer small strands 4 and 16 outer layer steel wire rope strands 5. Except for the inner layer steel wire rope center strand 1, the remaining strands are uniformly twisted around the inner layer steel wire rope center strand 1 in the circumferential direction; the number of steel wires in the inner layer steel wire rope center strand 1, the inner layer steel wire rope inner layer strand 2, the inner layer steel wire rope sub-outer layer large strand 3, the inner layer steel wire rope sub-outer layer small strand 4 and the outer layer steel wire rope strand 5 are all 7, and the structure is K(1+6); the steel wire surface is galvanized; the steel wire rope is filled with solid polymer 6, allowing the solid polymer to be squeezed out from the gap of the outer layer steel wire rope strands. The following will take the main crane lifting and luffing wire rope with D40.0mm, structure 16×K7-EPIWRC, and strength level 1960MPa as an example for explanation. The surface coating grade of the steel wire is B, the galvanizing process is hot-dip galvanizing, the minimum breaking tension required for the steel wire rope is 1300kN, the steel wire strength level is 1960MPa, and the diameter deviation control range of the steel wire rope is between 2.10-4.30%. It is suitable for lifting and luffing steel wire ropes for main cranes of marine engineering ships.

[0030] The abbreviated structural formula of the steel wire rope in this embodiment is 16×K7-EPIWRC, and the expanded structural formula can be expressed as:

[0031] 16×K(1+6)-EP[6×K(1+6)+6×K(1+6)-6×K(1+6)-1×K(1+6)];

[0032] When designing the wire rope, the design safety factor for the minimum breaking force is 2.5%, that is, the designed minimum breaking force of the crane wire rope is 1300×1.025=1333kN.

[0033] The total metal cross-sectional area of ​​the wire rope is calculated to be 872.0 mm 2 , the twisting loss is taken as 0.78 according to the empirical coefficient, and the theoretical calculation formula of the minimum breaking tension of the wire rope is:

[0034] F C。min =A﹒ K﹒ Rr / 1000=872.0×0.78×1960 / 1000=1334kN

[0035] Therefore, the theoretical calculated value of the minimum breaking force of the D40.0mm crane wire rope is F C .

[0036] min =1334kN, which is greater than the designed minimum breaking force value of 1333kN and meets the design requirements.

[0037] Example 3

[0038] The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane of the present invention has a structure as follows Figure 2 As shown, it includes 1 inner layer steel wire rope center strand 1, 7 inner layer steel wire rope inner strands 2, 7 inner layer steel wire rope sub-outer layer large strands 3, 7 inner layer steel wire rope sub-outer layer small strands 4 and 18 outer layer steel wire rope strands 5. Except for the inner layer steel wire rope center strand 1, the remaining strands are uniformly twisted around the inner layer steel wire rope center strand 1 in the circumferential direction; the number of steel wires in the inner layer steel wire rope center strand 1, the inner layer steel wire rope inner strand 2, the inner layer steel wire rope sub-outer layer large strand 3, the inner layer steel wire rope sub-outer layer small strand 4 and the outer layer steel wire rope strand 5 is 7, and the structure is K(1+6); the steel wire surface is galvanized; the steel wire rope is filled with solid polymer 6, allowing the solid polymer to be squeezed out from the gap of the outer layer steel wire rope strands. The following will take the main crane lifting and luffing wire rope with D60.0mm, structure 18×K7-EPIWRC, and strength level 1960MPa as an example for explanation. The surface coating grade of the steel wire is B, the galvanizing process is hot-dip galvanizing, the minimum breaking tension required for the steel wire rope is 2950kN, the steel wire strength level is 1960MPa, and the diameter deviation control range of the steel wire rope is between 2.10-4.30%. It is suitable for lifting and luffing steel wire ropes for main cranes of marine engineering ships.

[0039] The abbreviated structural formula of the steel wire rope in this embodiment is 18×K7-EPIWRC, and the expanded structural formula can be expressed as:

[0040] 18×K(1+6)-EP[7×K(1+6)+7×K(1+6)-7×K(1+6)-1×K(1+6)];

[0041] When designing the wire rope, the design safety factor for the minimum breaking force is 2.5%, that is, the designed minimum breaking force of the crane wire rope is 2950×1.025=3024kN.

[0042] The total metal cross-sectional area of ​​the wire rope is calculated to be 2007.4mm 2 , the twisting loss is taken as 0.78 according to the empirical coefficient, and the theoretical calculation formula of the minimum breaking tension of the wire rope is:

[0043] F C。min =A﹒K﹒R r / 1000=2007.4×0.78×1960 / 1000=3069kN

[0044] Therefore, the theoretical calculated value of the minimum breaking force of the D60.0mm crane wire rope is F C .

[0045] min =3069kN, which is greater than the designed minimum breaking force value of 3024kN and meets the design requirements.

[0046] Example 4

[0047] The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane of the present invention has a structure as follows Figure 3 As shown, it comprises 1 inner steel wire rope center strand 1, 7 inner steel wire rope inner strands 2, 7 inner steel wire rope sub-outer large strands 3, 7 inner steel wire rope sub-outer small strands 4 and 18 steel wire rope outer strands 5. Except for the inner steel wire rope center strand 1, the other strands are uniformly twisted around the inner steel wire rope center strand 1 in a circumferential direction; the number of steel wires in the inner steel wire rope center strand 1, the inner steel wire rope inner strand 2, the inner steel wire rope sub-outer large strand 3, the inner steel wire rope sub-outer small strand 4 and the steel wire rope outer strand 5 is 19, and the structure is K (1+9+9); the steel wire surface is galvanized; the steel wire rope is filled with a solid polymer 6, allowing the solid polymer to be squeezed out from the gaps in the outer strands of the steel wire rope. The following will take the main crane hoisting and luffing wire rope with D80.0mm, structure 18×K19S-EPIWRC, and strength level 1960MPa as an example. The surface coating grade of the steel wire is B, the galvanizing process is hot-dip galvanizing, the minimum breaking tension of the steel wire rope is 5200kN, the strength level of the steel wire is 1960MPa, and the diameter deviation of the steel wire rope is controlled within the range of 2.10-4.30%, which is suitable for the hoisting and luffing wire rope of the main crane of the offshore engineering ship.

[0048] The abbreviated structural formula of the steel wire rope in this embodiment is 18×K19S-EPIWRC, and the expanded structural formula can be expressed as:

[0049] 18×K(1+9+9)-EP[7×K(1+9+9)+7×K(1+9+9)-7×K(1+9+9)-1×K(1+9+9)];

[0050] When designing the wire rope, the design safety factor for the minimum breaking force is 2.5%, that is, the designed minimum breaking force of the crane wire rope is 5200×1.025=5330kN.

[0051] The total metal cross-sectional area of ​​the wire rope is calculated to be 3829.4 mm 2 , the twisting loss is taken as 0.78 according to the empirical coefficient, and the theoretical calculation formula of the minimum breaking tension of the wire rope is:

[0052] FC. min=A﹒ K﹒ Rr / 1000=3829.4×0.78×1960 / 1000=5855kN

[0053] Therefore, the theoretical calculated value of the minimum breaking force of D60.0mm crane wire rope is FC.

[0054] min=5855kN, which is greater than the designed minimum breaking force of 5330kN and meets the design requirements.

Claims

1. Impact-resistant and rotation-resistant galvanized steel wire rope for offshore engineering cranes, characterized in that: The invention comprises an inner layer steel wire rope center strand (1), the outer circumference of the inner layer steel wire rope center strand (1) is provided with inner layer strands, the outer circumference of the inner layer strands is provided with a plurality of steel wire rope outer layer strands (5) evenly arranged, and the space between the inner layer steel wire rope center strand (1) and the inner layer strands, and between the inner layer strands and the steel wire rope outer layer strands (5) are filled with solid polymer.

2. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 1 is characterized in that: The inner strands include a plurality of inner strands (2) of inner steel wire ropes, the plurality of inner strands (2) of inner steel wire ropes being evenly arranged along the outer circumference of the inner steel wire rope center strand (1) and each of the inner strands (2) of inner steel wire ropes being in contact with the inner steel wire rope center strand (1), and a secondary outer strand being arranged along the outer circumference of a circle formed by the plurality of inner strands (2) of inner steel wire ropes.

3. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 2 is characterized in that: The secondary outer strands include a plurality of inner layer steel wire rope secondary outer large strands (3) and a plurality of inner layer steel wire rope secondary outer small strands (4). The plurality of inner layer steel wire rope secondary outer large strands (3) and the plurality of inner layer steel wire rope secondary outer small strands (4) are arranged at intervals. Each inner layer steel wire rope secondary outer large strand (3) is in contact with its adjacent inner layer steel wire rope inner strand (2), and each inner layer steel wire rope secondary outer small strand (4) is in contact with its adjacent inner layer steel wire rope inner strand (2).

4. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 3 is characterized in that: The structures of the inner steel wire rope center strand (1), the inner steel wire rope inner strand (2), the inner steel wire rope sub-outer large strand (3), the inner steel wire rope sub-outer small strand (4) and the steel wire rope outer strand (5) are consistent, and all include a central steel wire (7). A plurality of outer steel wires (8) are evenly arranged on the outer circumference of the central steel wire (7). The surfaces of the central steel wire (7) and the outer steel wire (8) are both galvanized.

5. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 3 is characterized in that: The structures of the inner layer steel wire rope center strand (1), the inner layer steel wire rope inner strand (2), the inner layer steel wire rope sub-outer layer large strand (3), the inner layer steel wire rope sub-outer layer small strand (4) and the steel wire rope outer strand (5) are consistent, and all include a central steel wire (7), a plurality of intermediate layer steel wires (9) are evenly arranged on the outer circumference of the central steel wire (7), and a plurality of outer layer steel wires (8) are evenly arranged along the outer circumference of a circle formed by the plurality of intermediate layer steel wires (9), and the surfaces of the central steel wire (7), the intermediate layer steel wire (9) and the outer layer steel wire (8) are all galvanized.

6. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 4 or 5, characterized in that: The number of steel wires in the inner steel wire rope center strand (1), the inner steel wire rope inner strand (2), the inner steel wire rope second outer large strand (3), the inner steel wire rope second outer small strand (4) and the steel wire rope outer strand (5) is not less than 7.

7. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 3 is characterized in that: A plurality of inner strands (2) of inner steel wire rope, a plurality of large strands (3) of inner steel wire rope sub-outer strands, a plurality of small strands (4) of inner steel wire rope sub-outer strands and a plurality of outer strands (5) of steel wire rope are all uniformly twisted in sequence around the inner steel wire rope center strand (1) and are all compacted strands.

8. The impact-resistant and rotation-resistant galvanized steel wire rope for marine engineering crane according to claim 1, characterized in that: The number of the outer strands (5) of the steel wire rope is not less than 10.

Images