A composite rope made of steel wire strands and natural fibers for submarine cable laying and its manufacturing method

Abstract

This invention discloses a steel wire strand and natural fiber composite rope for submarine cable laying and its manufacturing method, relating to the field of equipment for submarine cable construction. The rope comprises: high-strength steel wire compacted strands, a PVC plastic sheath, and natural sisal fiber strands. The PVC plastic sheath covers the outer surface of the high-strength steel wire compacted strands, and the natural sisal fiber strands are twisted onto the outer surface of the PVC plastic sheath. The high-strength steel wire compacted strands, PVC plastic sheath, and natural sisal fiber strands form a base rope. Multiple base ropes are twisted to form sub-ropes, and multiple sub-ropes are twisted to form the steel wire strand and natural fiber composite rope. Using high-strength compacted steel wire strands as the main strength component, it has higher metal density, structural strength, and load-bearing capacity compared to ordinary steel wire ropes. The outer surface of the high-strength compacted steel wire strands is sequentially provided with a PVC plastic sheath and natural sisal fiber strands, which simultaneously provides the advantages of high friction for easy gripping and low weight.

Description

Technical Field

[0001] This invention relates to the field of equipment for submarine cable construction, and in particular to a steel wire strand natural fiber composite rope for submarine cable laying and its manufacturing method. Background Technology

[0002] When laying submarine cables, auxiliary ropes are required. Existing ropes include steel wire ropes, natural fiber ropes, and synthetic fiber ropes. Among them, steel wire ropes have a high load-bearing capacity, but they are heavy and have a smooth surface that makes them difficult to grip. Natural fiber ropes have a rough surface that is easy to grip, but their load-bearing capacity is low. Synthetic fiber ropes are lightweight and have a high load-bearing capacity, but they are easily thermally degraded by friction and heating from equipment such as cable engines, winches, and rollers, which reduces their load-bearing capacity and makes them less stable.

[0003] In view of this, current ropes have certain limitations when used as auxiliary ropes for laying submarine cables. How to provide an auxiliary rope for laying submarine cables with high load-bearing capacity, light weight, and strong stability is a technical problem that urgently needs to be solved by people in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a steel wire strand natural fiber composite rope for submarine cable laying, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a steel wire strand natural fiber composite rope for submarine cable laying, comprising: high-strength steel wire compacted strands, PVC plastic sheath, and natural sisal fiber strands; the PVC plastic sheath covers the outer surface of the high-strength steel wire compacted strands, the natural sisal fiber strands are twisted on the outer surface of the PVC plastic sheath, the high-strength steel wire compacted strands, the PVC plastic sheath, and the natural sisal fiber strands form a base rope, multiple base ropes are twisted to form sub-ropes, and multiple sub-ropes are twisted to form a steel wire strand natural fiber composite rope.

[0006] Furthermore, the high-strength steel wire compacted strand is formed by twisting multiple steel wires together in surface contact, with a twist pitch of 8.8 to 9.6 times the diameter of the base rope, and the twist direction is the same as that of the multiple sub-ropes.

[0007] Furthermore, the steel wire is a galvanized steel wire that is first drawn and then plated.

[0008] Furthermore, there are seven steel wires, one of which is located at the center, and the other six steel wires are twisted around the base rope located at the center to form the high-strength steel wire compacted strand.

[0009] Furthermore, the natural sisal fiber strand is formed by twisting 5 to 8 natural fiber yarns on the outer surface of the PVC plastic sheath, with a twist pitch of 4.6 to 5.8 times the diameter of the base rope, and the twist direction is the same as that of the multiple sub-ropes.

[0010] Furthermore, the thickness of the PVC plastic sheath is 0.5 to 1.5 mm.

[0011] Furthermore, there are seven base ropes, one of which is located at the center, and the other six base ropes are twisted around the base rope located at the center to form the sub-ropes, with a twist pitch of 7.7 to 8.2 times the diameter of the sub-rope, and the twist direction is opposite to that of the multiple sub-ropes.

[0012] Furthermore, the sub-rope has three strands, which are twisted together to form the steel wire strand natural fiber composite rope, with a twist pitch of 7.5 to 8 times the diameter of the steel wire strand natural fiber composite rope.

[0013] This invention also provides a method for manufacturing a steel wire strand natural fiber composite rope for submarine cable laying, comprising the following steps:

[0014] S1: Twist the steel wires with a twisting machine and compact them with a roller pressing die to form a high-strength steel wire compacted strand with one steel wire in the center and six steel wires surrounding the center;

[0015] S2: The high-strength steel wire compacted strand is passed through an extrusion die and covered with a PVC plastic sheath on the outer surface of the high-strength steel wire compacted strand;

[0016] S3: Use a twisting machine to twist natural sisal fiber strands on the outer surface of the PVC plastic sheath to form a basic rope;

[0017] S4: The base rope is twisted using a twisting machine to form a base rope in the center, with six sub-ropes arranged around the center;

[0018] S5: Three sub-ropes are twisted together to form a composite rope of steel wire strands and natural fibers.

[0019] Furthermore, the compression ratio of the roller pressing die is 14-16%.

[0020] The present invention discloses the following technical effects:

[0021] High-strength compacted steel wire strands are used as the main strength components, resulting in higher metal density, structural strength, and load-bearing capacity compared to ordinary steel wire ropes. The outer surface of the high-strength compacted steel wire strands is sequentially fitted with a PVC plastic sheath and natural sisal fiber strands, providing the advantages of high friction for easy gripping and low weight. The steel wire surface is galvanized, and combined with the PVC plastic sheath, it provides double corrosion protection for the internal steel wires, meeting the requirements for auxiliary ropes in submarine cable laying. The leader ropes use a 3-leader twist, which offers higher torque stability compared to the conventional 6-leader twist, facilitating winding. Furthermore, the leader ropes and the base rope use opposite twist directions, which helps to prevent rotation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the steel wire strand natural fiber composite rope of the present invention;

[0024] The components include: 1. High-strength steel wire compacted strands; 2. PVC plastic sheath; 3. Natural sisal fiber strands; 4. Base rope; and 5. Sub-ropes. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 This invention provides a steel wire strand natural fiber composite rope for submarine cable laying, comprising: high-strength steel wire compacted strand 1, PVC plastic sheath 2, and natural sisal fiber strand 3; the PVC plastic sheath 2 covers the outer surface of the high-strength steel wire compacted strand 1, and the natural sisal fiber strand 3 is twisted on the outer surface of the PVC plastic sheath 2. The high-strength steel wire compacted strand 1, PVC plastic sheath 2, and natural sisal fiber strand 3 form a base rope 4. Multiple base ropes 4 are twisted to form sub-ropes 5, and multiple sub-ropes 5 are twisted to form a steel wire strand natural fiber composite rope.

[0028] In one embodiment, the high-strength steel wire compacted strand 1 is formed by twisting multiple steel wires face to face, with a twist pitch of 8.8 to 9.6 times the diameter of the base rope 4. In this embodiment, the preferred twist pitch is 9 times the diameter of the base rope 4. The twist direction is the same as that of the multiple sub-ropes 5, and the twist direction of the sub-ropes 5 is to the right. The steel wire is galvanized steel wire that has been drawn and then plated. There are seven steel wires, one of which is located at the center, and the other six steel wires are twisted around the base rope 4 located at the center to form the high-strength steel wire compacted strand 1.

[0029] In one embodiment, the natural sisal fiber strand 3 is formed by twisting 5 to 8 natural fiber yarns onto the outer surface of the PVC plastic sheath 2, with a twist pitch of 4.6 to 5.8 times the diameter of the base rope 4, and the twist direction is the same as that of the multiple sub-ropes 5. Preferably, in this embodiment, the natural sisal fiber strand 3 is formed by twisting 7 natural fiber yarns, with a twist pitch of 5 times the diameter of the base rope 4. The thickness of the PVC plastic sheath 2 is 0.5 to 1.5 mm, preferably 1 mm in this embodiment. There are seven base ropes 4, one of which is located at the center, and the other six base ropes 4 are twisted around the base rope 4 located at the center to form sub-ropes 5, with a twist pitch of 7.7 to 8.2 times the diameter of the sub-rope 5, preferably 8 times the diameter of the sub-rope 5 in this embodiment, and the twist direction is opposite to that of the multiple sub-ropes 5. There are three sub-rods 5, which are twisted to form a steel wire strand natural fiber composite rope. The twist pitch is 7.5 to 8 times the diameter of the steel wire strand natural fiber composite rope. In this embodiment, the twist pitch is preferably 8 times the diameter of the steel wire strand natural fiber composite rope.

[0030] The method for manufacturing steel wire strand natural fiber composite rope includes the following steps:

[0031] S1: The steel wire is twisted using a twisting machine and compacted using a roller pressing die to form a high-strength steel wire compacted strand 1 with one steel wire in the center and six steel wires surrounding the center. The compression rate of the roller pressing die is 15%.

[0032] S2: The high-strength steel wire compacted strand 1 is covered with a PVC plastic sheath 2 on the outer surface of the high-strength steel wire compacted strand 1 through an extrusion die;

[0033] S3: Use a twisting machine to twist natural sisal fiber strands 3 on the outer surface of the PVC plastic sheath 2 to form a basic rope 4;

[0034] S4: Twist the base rope 4 using a twisting machine to form a base rope 4 in the center, and set six sub-ropes 5 around the center of the base rope 4;

[0035] S5: Twist the three sub-ropes 5 to form a steel wire strand natural fiber composite rope.

[0036] The parameter test results of the steel wire strand natural fiber composite rope prepared in this embodiment are as follows:

[0037] Specifications: 50mm

[0038] Minimum breaking strength of the rope: 490kN (50t)

[0039] Rope safety load: 98kN (10t)

[0040] Safety factor: 5

[0041] Reference unit weight: 3.30 kg / m (air), 1.85 kg / m (seawater)

[0042] As can be seen from the above parameter test results, the steel wire strand natural fiber composite rope made in this embodiment has sufficient load-bearing capacity, safety and stability, and can greatly reduce the overall weight.

[0043] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A steel wire strand natural fiber composite rope for submarine cable laying, characterized in that, include: High-strength steel wire compacted strand (1), PVC plastic sheath (2) and natural sisal fiber strand (3); the PVC plastic sheath (2) covers the outer surface of the high-strength steel wire compacted strand (1), the natural sisal fiber strand (3) is twisted on the outer surface of the PVC plastic sheath (2), the high-strength steel wire compacted strand (1), PVC plastic sheath (2) and natural sisal fiber strand (3) form a base rope (4), multiple base ropes (4) are twisted to form sub-ropes (5), multiple sub-ropes (5) are twisted to form a steel wire strand natural fiber composite rope; The high-strength steel wire compacted strand (1) is formed by twisting multiple steel wires in face contact, with a twist pitch of 8.8 to 9.6 times the diameter of the base rope (4), and the twist direction is the same as that of the multiple sub-ropes (5); The steel wire is a galvanized steel wire that has been drawn and then plated. There are seven steel wires, one of which is located at the center, and the other six steel wires are twisted around the steel wire located at the center to form the high-strength steel wire compacted strand (1); The natural sisal fiber strand (3) is formed by twisting 5 to 8 natural fiber yarns on the outer surface of the PVC plastic sheath (2), with a twist pitch of 4.6 to 5.8 times the diameter of the base rope (4), and the twist direction is the same as that of the multiple sub-ropes (5); The thickness of the PVC plastic sheath (2) is 0.5 to 1.5 mm; There are seven base ropes (4), one of which is located at the center, and the other six base ropes (4) are twisted around the base rope (4) located at the center to form the sub-ropes (5). The twist pitch is 7.7 to 8.2 times the diameter of the sub-rope (5), and the twist direction is opposite to that of the multiple sub-ropes (5). The sub-rope (5) has three strands, which are twisted together to form the steel wire strand natural fiber composite rope. The twist pitch is 7.5 to 8 times the diameter of the steel wire strand natural fiber composite rope.

2. A method for manufacturing a steel wire strand natural fiber composite rope for submarine cable laying, characterized in that, Includes the following steps: S1: Twist the steel wires with a twisting machine and compact them with a roller pressing die to form a high-strength steel wire compacted strand with one steel wire in the center and six steel wires around the center (1); S2: The high-strength steel wire compacted strand (1) is passed through an extrusion die and covered with a PVC plastic sheath (2) on the outer surface of the high-strength steel wire compacted strand (1); S3: Use a twisting machine to twist natural sisal fiber strands (3) on the outer surface of the PVC plastic sheath (2) to form a base rope (4); S4: The base rope (4) is twisted into a base rope (4) at the center, and six sub-ropes (5) are arranged around the center. S5: Twist the three sub-ropes (5) to form a steel wire strand natural fiber composite rope.

3. The method for manufacturing a steel wire strand natural fiber composite rope for submarine cable laying according to claim 2, characterized in that, The compression rate of the roller pressing die is 14-16%.

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