CN118538457A

CN118538457A - Composite Trailing Cable

Info

Publication number: CN118538457A
Application number: CN202411003331.0A
Authority: CN
Inventors: 周卫云; 赵静; 李家哲; 朱鹏宇; 吴俊峰; 缪威玮; 缪小明; 谭枫; 马娜; 刘文军; 寇启龙; 刘毅; 李燕
Original assignee: Jiangsu Zhongtian Technology Co Ltd; Luoyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Current assignee: Jiangsu Zhongtian Technology Co Ltd; Luoyang Power Supply Co of State Grid Henan Electric Power Co Ltd
Priority date: 2024-07-25
Filing date: 2024-07-25
Publication date: 2024-08-23
Anticipated expiration: 2044-07-25
Also published as: CN118538457B

Abstract

The invention relates to the technical field of underwater towlines, and provides a composite towing cable which comprises a cable core, an inner protective layer, an outer protective layer and a fiber reinforced layer; the outer wall of the inner protective layer is circumferentially and uniformly provided with a plurality of first grooves of a spiral structure extending longitudinally along the optical cable; the outer protective layer is sleeved outside the inner protective layer, a plurality of second grooves of spiral structures extending longitudinally along the optical cable are uniformly distributed on the circumference of the inner wall of the outer protective layer, and the spiral directions of the second grooves and the first grooves are opposite; the fiber reinforced layer is arranged between the inner protective layer and the outer protective layer and at least comprises a first fiber reinforced layer and a second fiber reinforced layer; each fiber reinforcement layer comprises a plurality of fiber yarns, and each fiber yarn is partially clamped in the first groove or the second groove. According to the invention, the slipping between the fiber yarns and the protective layer can be avoided through the arrangement of the grooves, so that the tightness of the fiber yarns is higher, the stability is stronger, and the problems of insufficient breaking strength and poor repeated tension and bending resistance of the composite towing cable are solved.

Description

Composite towing cable

Technical Field

The invention relates to the technical field of underwater towlines, in particular to a composite towing cable.

Background

The towing cable is a cable for connecting equipment such as an underwater robot, a buoy and the like, and the floating body is towed out of the ship body or controlled to move by a towing mode. The towing cable plays roles of mechanical connection and signal communication, and has functions of towing, control, power supply, equipment operation monitoring and the like. These cables are required to have high working tension, high hydrostatic pressure resistance, repeated winding and unwinding resistance, photoelectric mixing and other properties.

With the rapid development of the marine industry, the development technology of marine resources is mature, and higher requirements are put on the energy supply, communication and monitoring performance of the towing cable for underwater or submarine. The trailing cable is required to have not only high-strength tensile properties to ensure safety of equipment but also good transmission properties. Thus, the trailing cable needs to maintain a small bend radius, high working tension and low loss at the same time, with small size, working space and reduced weight.

In contrast to large section heavy-duty trailing cables employing wire armouring, light-duty trailing cables generally employ fibre reinforced materials as reinforcement and have a smaller cable diameter, typically no more than 12mm. This is done to meet the high breaking strength (i.e., breaking force) and reliability requirements for repeated retraction. Therefore, there are higher demands on the structural design and manufacture of trailing composite cables.

In the related art, the problem that the breaking strength cannot reach the expected force value exists after the actual production of the light photoelectric composite trailing cable, and the main reason is that the fiber reinforced material cannot exert the tensile property to the maximum extent; meanwhile, because the nonmetallic structure has certain looseness, in the repeated winding and unwinding process, the towing cable can deflect to one side due to the fact that the fiber reinforced material is bent by tension, so that the cable is deformed and cannot recover, and when serious, the cable core can bend and break fibers, and the service life is shortened.

Disclosure of Invention

The invention provides a composite towing cable which is used for solving the defects of insufficient breaking strength, poor repeated tension bending resistance and low service life caused by the damage of an optical cable after repeated winding and unwinding in the prior art.

The invention provides a composite trailing cable comprising:

A cable core;

The inner protection layer is coated outside the cable core, a plurality of first grooves are uniformly distributed on the periphery of the outer wall of the inner protection layer in the circumferential direction, and each first groove continuously extends along the longitudinal direction in a periodic curve to form a spiral groove structure;

The outer protective layer is sleeved outside the inner protective layer, a plurality of second grooves are uniformly distributed on the periphery of the inner wall of the outer protective layer in the circumferential direction, each second groove continuously extends along the longitudinal direction in a periodic curve to form a spiral groove structure, and the spiral directions of the second grooves and the first grooves are opposite;

the fiber reinforced layer is arranged between the inner protective layer and the outer protective layer, and at least comprises a first fiber reinforced layer and a second fiber reinforced layer;

The first fiber reinforcement layer comprises a plurality of first fiber yarns, the first fiber yarns are in one-to-one correspondence with the first grooves, and parts of the first fiber yarns are clamped in the first grooves;

The second fiber reinforcement layer comprises a plurality of second fiber yarns, the second fiber yarns are in one-to-one correspondence with the second grooves, and parts of the second fiber yarns are clamped in the second grooves.

According to the composite trailing cable provided by the invention, the composite trailing cable further comprises an adhesive layer, and the adhesive layer is arranged between the adjacent fiber reinforcement layers.

According to the composite trailing cable provided by the invention, the bonding layer comprises a plurality of bonding points, the bonding points are periodically arranged at intervals along the surface of the fiber reinforcement layer, and the bonding points continuously form a spiral curve shape so as to enable part of adjacent fiber yarns in the fiber reinforcement layer to be bonded.

According to the composite trailing cable provided by the invention, each strand of the first fiber yarn and each strand of the second fiber yarn are formed by twisting a plurality of fiber wires.

According to the composite trailing cable provided by the invention, the yarn branch sectional areas S of the first fiber yarns and the second fiber yarns meet the following formula:

;

wherein s is yarn count density, and D is linear density of fiber yarn;

correspondingly, the groove depth h and the groove width w of the first groove and the second groove satisfy the following relation:

；

Wherein S is the cross-sectional area of the yarn branch of the first fiber yarn or the second fiber yarn.

According to the composite trailing cable provided by the invention, the first groove and the second groove are provided with the pitch L and the twisting angle alpha;

Wherein, Wherein d is the minimum diameter of the inner protective layer or the minimum diameter of the outer protective layer.

According to the composite trailing cable provided by the invention, the same fiber reinforced layer has the same twisting angle alpha, the pitch of the fiber reinforced layer from inside to outside is gradually increased, and the fixed pitch on each protective layer is obtained by the following formula:

；

Wherein, The pitch of the fiber reinforced layer in the n-th layer is the minimum diameter of the protective layer formed in the n-1-th layer.

According to the composite trailing cable provided by the invention, the cable core comprises an electrical unit and an optical unit, and the electrical unit and the optical unit are in stranded arrangement.

According to the composite towing cable provided by the invention, the composite towing cable further comprises a buffer layer, and the buffer layer is arranged between the cable core and the inner protective layer.

According to the composite trailing cable provided by the invention, the buffer layer is prepared from the elastic polymer material, is coated outside the cable core and is filled in the gap of the cable core, so that the buffer layer is directly contacted with the outer wall surface of the cable core.

According to the composite trailing cable provided by the invention, the cross section of the buffer layer is formed into a honeycomb structure, and the surface of the buffer layer is coated with the lubricant, so that the lubricant naturally permeates into the buffer layer, and the buffer layer has lubricating property.

According to any of the embodiments described above, the present invention has at least the following advantageous effects:

According to the composite towing cable, the grooves are formed in the inner protective layer and the outer protective layer, and the first fiber yarns and the second fiber yarns are partially clamped into the grooves to form at least two fiber reinforced layers respectively, so that slippage between the fiber yarns and the protective layer can be avoided through the grooves, the tightness of the fiber yarns is higher, the stability is higher, and the problems of insufficient breaking strength and poor repeated tension bending resistance of the composite towing cable are solved.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a composite trailing cable according to the present invention.

Fig. 2 is a schematic diagram of a groove extending structure of an inner protection layer in a composite trailing cable according to the present invention.

Fig. 3 is a schematic view of a partial structure of an inner protective layer in a composite trailing cable according to the present invention.

Fig. 4 is a schematic view of a partial structure of an outer protective layer in a composite trailing cable according to the present invention.

Fig. 5 is a schematic structural diagram of an adhesive layer in a composite trailing cable according to the present invention.

Fig. 6 is a schematic diagram of bonding points in a composite trailing cable provided by the invention.

Fig. 7 is a schematic structural diagram of a buffer layer in a composite trailing cable according to the present invention.

Reference numerals:

10. A cable core; 11. an electrical unit; 12. a light unit; 20. an inner protective layer; 21. a first groove; 30. an outer protective layer; 31. a second groove; 40. a fiber reinforcement layer; 41. a first fibrous reinforcement layer; 42. a second fibrous reinforcement layer; 50. an adhesive layer; 51. a bonding point; 60. a buffer layer; 61. and (3) a lubricant.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.

In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

In the related art, the light composite trailing cable adopts fiber materials as a reinforcing layer, the fiber materials have certain looseness, and when the requirement on the trailing force is higher, the requirements on the linear density and the number of fiber yarns are also higher, so that the fiber yarns are easy to abrade mutually in the process of preparing and twisting, the surface is fluffed or part of fiber monofilaments are broken, the maximum force value is reduced to a certain extent, and the expected force value is difficult to reach. And because of the looseness of the fiber yarns, the fiber yarns can slide in the repeated winding and unwinding processes, so that the repeated tension bending resistance is poor, and the optical cable is damaged after repeated winding and unwinding, so that the service life is low.

In view of the problems in the related art, as shown in fig. 1 to 4, the present invention provides a composite trailing cable, including a cable core 10, an inner protective layer 20, an outer protective layer 30, and a fiber reinforcement layer 40; the cable core 10 is used for transmitting information and transmitting electric energy, the inner protective layer 20 is coated outside the cable core 10, a plurality of first grooves 21 are uniformly distributed on the periphery of the outer wall of the inner protective layer 20 in the circumferential direction, and each first groove 21 continuously extends along the longitudinal direction in a periodic curve to form a spiral groove structure; the outer protective layer 30 is sleeved outside the inner protective layer 20, a plurality of second grooves 31 are uniformly distributed on the circumference of the inner wall of the outer protective layer 30, each second groove 31 continuously extends along the longitudinal direction in a periodic curve to form a spiral groove structure, and the spiral directions of the second grooves 31 and the first grooves 21 are opposite; the fiber reinforced layer 40 is arranged between the inner protective layer 20 and the outer protective layer 30, and the fiber reinforced layer 40 at least comprises a first fiber reinforced layer 41 and a second fiber reinforced layer 42; wherein, the first fiber reinforced layer 41 comprises a plurality of first fiber yarns, the first fiber yarns are in one-to-one correspondence with the first grooves 21, and part of the first fiber yarns are clamped in the first grooves 21; the second fiber reinforced layer 42 includes a plurality of second fiber yarns, and the second fiber yarns are in one-to-one correspondence with the second grooves 31, and part of the second fiber yarns are clamped in the second grooves 31. Compared with the heavy-duty towing cable of steel wire, the diameter of the light-duty towing cable is smaller, the reinforcing layer of the towing cable is required to have higher density and a larger number of fiber yarns, and the fiber yarns are characterized by being made of flexible materials and have certain looseness, so that problems in the related art are caused.

It will be appreciated that each fiber yarn of the related art is composed of a plurality of extremely fine fiber filaments, and thus has a certain coefficient of bulk; when the drag force value is required to be higher, the requirements on the linear density and the number of the fiber yarns are also higher, and the fiber yarns are easy to abrade mutually in the twisting process, so that the surface is fluffed or part of fiber monofilaments are broken, and the force value is reduced to a certain extent. In this example, the fiber yarns are partially clamped in the grooves, so that abrasion between the same layer of fiber yarns is avoided, and the fiber yarns can exert the tensile strength of the fiber yarns to the maximum extent, so that the problem that the design performance is difficult to achieve in the prior art is solved. And the arrangement of the grooves enables the structure of the fiber reinforced layer 40 to be stable after the towing cable is formed, and the fiber reinforced layer can have better tensile capacity.

The cable core 10 comprises an electrical unit 11 and an optical unit 12, the electrical unit 11 and the optical unit 12 being stranded. The electrical unit 11 is used for delivering electrical energy and the optical unit 12 is used for transmitting information. Wherein the twisting mode is unidirectional twisting or SZ twisting (SZ twisting is a twisting mode conventional in the art).

When the cable is specifically arranged, at least one electric unit 11 and one optical unit 12 are arranged in the cable core 10, so that the functions of power supply and information transmission are complete, and the specific number is not limited. Specifically, as shown in fig. 1, three or more power or information transmission units are selected to be twisted according to the requirements of the apparatus.

In this embodiment, in order to improve the structural stability of the cable core 10, a filling member may be placed at a central position where the optical unit 12 and the electrical unit 11 are twisted, that is, the optical unit 12 and the electrical unit 11 may be twisted longitudinally along the filling member to form the cable core 10. Further, the filler element may also replace the stranded light unit 12 or the electrical unit 11. The filler element is made of a non-metallic material such as low density polyethylene, thermoplastic elastomer, etc. The plastic has the typical characteristics of small density, light weight, certain flexibility and repeated bending resistance.

The optical unit 12 includes an optical fiber and a coating layer coated on the outer periphery of the optical fiber. The coating layer includes a plastic layer for the buffer layer 60 and the outermost periphery. The buffer layer 60 is usually a liquid or gel material with a certain viscosity, such as ointment, silicone oil, etc., for lubrication and protection of the optical fiber; the plastic layer is a high molecular polymer with excellent bending property, and common materials such as polyester elastomer, thermoplastic elastomer, polyolefin and the like are used. Specifically, the optical unit 12 includes at least 1 core optical fiber, and the optical fiber type is g.657.

The electrical unit 11 comprises a metal conductor, a protective layer covering the metal conductor, and possibly a shielding layer. The metal conductor is a round tinned soft copper stranded wire, and is a round stranded wire formed by stranding a plurality of round single wires by a stranding or concentric layer stranding method. The protective layer coated outside the metal conductor adopts the poly-perfluoroethylene propylene resin, and is uniformly coated on the surface of the conductor through extrusion molding, and the thickness is 0.25 mm-0.5 mm. And the shielding layer is coated on the periphery of the metal conductor protective layer and is formed by braiding metal copper wires.

Specifically, the fiber reinforced layer 40 has at least two layers, that is, a first fiber reinforced layer 41 on the innermost protective layer 20 and a second fiber reinforced layer 42 on the outer protective layer 30, multiple fiber reinforced layers 40 may be further disposed between the outer layer and the inner layer, the number of specific fiber reinforced layers 40 is selected according to design requirements, and the number of specific fiber reinforced layers 40 is not limited. It should be noted that the number of the two fiber-reinforced layers 40 in the embodiment of the present invention is explained and should not be construed as limiting the number of the fiber-reinforced layers 40.

As shown in fig. 1-3, a first groove 21 is formed on the outer wall surface of the inner protection layer 20, and the inner wall surface of the inner protection layer 20 is a smooth wall surface. The first fiber yarns are clamped in the first grooves 21 to form a first fiber reinforced layer 41, wherein the groove depth h and the groove width w of the first grooves 21 are in mm, and the number of the first grooves 21 is N; the number N of the first grooves 21 corresponds to the number M of the first fiber yarns, i.e. n=m, i.e. the first fiber yarns are arranged in a one-to-one correspondence with the first grooves 21, and the first fiber yarns are arranged along the first grooves 21 forming the corresponding first fiber reinforcement layer 41. The size of the first grooves 21 depends on the linear density D (denier) of the first fiber yarn and the cross-sectional area S (unit mm ²) of the first fiber yarn.

Wherein the cross-sectional area S (unit mm ²) of the first fiber yarn satisfies the following formula:

;

Where s (unit g/cm ³) is the yarn count density and D (denier) is the linear density of the first fiber yarn.

Specifically, the groove depth h and the groove width w of the first groove 21 and the second groove 31 satisfy the following relation:

；

Wherein S (unit mm ²) is the cross-sectional area of the yarn branch of the first fiber yarn. The first grooves 21, which are spiral in theory, are of a size that cannot fully accommodate the first fiber yarn, but because the fiber yarn has a certain degree of looseness, by limiting the ranges of h and w, when the fiber yarn is extruded to a certain degree, the fiber yarn is tightened to reduce the size thereof, so that the fiber yarn is more compact and can be accommodated in the first grooves 21. This also increases the contact area between the first fiber yarn and the inner protective layer 20, and ensures that each fiber yarn can be stressed when stretched by external force, thereby improving the tensile strength.

At the same time, the first grooves 21 extend in a spiral shape, which causes the first grooves 21 to have a pitch L and a twist angle α, in whichD ₁ is the minimum diameter of the inner shield 20. The part of the first fiber yarn is matched with the first groove 21 in a clamping way, and the rest part of the first fiber yarn protrudes outwards from the first groove 21, so that the twisting angle of the first fiber yarn and the first groove 21 in the twisting process is consistent, namely, the first fiber yarn can be just filled in the first groove 21 with the periodic longitudinal extension of the inner protective layer in the armor twisting process.

It will be appreciated that when d ₁ is the minimum diameter of the inner protective layer 20 and the minimum diameter of the outermost layer is different from the minimum diameter d ₁ of the inner protective layer 20, the twist angle α will be different in the multi-layered fiber reinforcement layer 40.

In a specific example, the same fiber-reinforced layer 40 has the same twist angle α, and the pitch of the fiber-reinforced layer from inside to outside is gradually increased, and the fixed pitch on each protective layer is obtained by the following formula:

；

Wherein, The pitch of the fiber reinforced layer in the n-th layer is the minimum diameter of the protective layer formed in the n-1-th layer. In this embodiment, there are at least two fiber reinforced layers, and the minimum diameter of the outer layer is larger than the minimum diameter of the inner layer as the protective layer expands gradually, so the pitch L of the outer layer is larger than the pitch L of the inner layer. As shown in fig. 1, in this embodiment, d ₁ is the minimum diameter of the inner protection layer 20 when n=1. For another example, when the pitch of the outermost outer protective layer 30 needs to be calculated, the minimum diameter thereof is d ₂.

Specifically, in some embodiments, the material of the inner and outer protective layers 30 is selected from thermoplastic elastomers that are resistant to hydrolysis and mold; such as TPU, TPV, TPE, TPO, etc. The fiber yarn can be replaced by aromatic imide fiber, aromatic polyamide fiber, poly (p-phenylene benzobisoxazole) fiber and modified materials thereof.

As shown in fig. 1,2 and 4, the outer protective layer 30 has a general structure similar to that of the inner protective layer 20, except that the outer wall surface of the outer protective layer 30 is a smooth surface, and the inner wall surface thereof has a spiral second groove 31 structure. And the second grooves 31 have a groove depth h and a groove width w, and the number N of the second grooves 31; there is also a pitch L and a twist angle α, and the minimum diameter of the outer shield 30 is d ₂.

The first grooves 21 in the inner and outer jackets and the second grooves 31 in the outer jacket 30 have different twist pitches L and twist angles α; the depth h and the width w, and the number of grooves is N, and the matching can be adjusted according to the linear density and the number of the contacted fiber yarn layers. Wherein, since the first fiber reinforcement layer 41 and the second fiber reinforcement layer 42 are respectively mated with the first groove 21 and the second groove 31, they may also correspond to the twist pitch L and the twist angle α therein.

It can be understood that the stranding angles of all layers are consistent, namely the axial tension of the fiber yarns in the towing cable is consistent, so that the fact that all the fiber yarns can be stressed simultaneously and deformed consistently is guaranteed to the greatest extent. So that the tensile strength thereof can be improved.

Specifically, the outermost surface of the outer protective layer 30 may have a coating layer, which is a film coated on the surface of the material, to provide resistance to the attachment, prevent marine organisms from adhering, and improve the service life of the trailing cable. Meanwhile, the resistance of the towing cable when running underwater can be reduced by the coating; common coating materials include anti-fouling polymers, silane modified polymers, polymer surface co-building polymers, nanoparticles, and the like.

Further, the outer protective layer 30 may be non-uniform, graded, streamlined in size; the surface can also be non-smooth, i.e. can be provided with grains; the purpose is to reduce drag when the trailing cable is running under water.

In a specific embodiment, the adopted fiber yarn is ultra-high molecular weight polyethylene fiber yarn; the breaking strength of each fiber yarn is not less than 11/30D (unit: N), D (unit: denier) is linear density; when the total number of filaments in the yarn is M, it can theoretically provide the trailing cable with a breaking strength force value F: Alpha is the twisting angle of the fiber yarn, K is the breakage coefficient, and the value of K is 0.85-0.95; from the above formula, it can be seen that when a specific breaking strength requirement is required for the trailing cable, the theoretically required fiber yarn number and the corresponding linear density can be obtained. Specifically, each fiber yarn can be formed by twisting a plurality of fiber filaments; thereby improving the breaking strength of the single fiber yarn.

According to one embodiment of the present invention, the composite trailing cable further includes an adhesive layer 50, and the adhesive layer 50 is disposed between adjacent fiber reinforcement layers 40. A plurality of fiber reinforced layers 40 may be disposed between the inner protective layer 20 and the outer protective layer 30, and the adjacent fiber reinforced layers 40 are connected through the adhesive layer 50, so that stability and resistance to repeated tension bending difference can be further improved, and thus, service life of the fiber reinforced layers is prolonged.

The bonding layer 50 is located between adjacent fiber yarn layers (inner and outer layers) in order to bond the fiber yarns in the adjacent two fiber yarn layers together so that they form a whole, thereby ensuring more uniform and sufficient stress.

As shown in fig. 5, since the spiral directions of the first groove 21 and the second groove 31 are opposite, which causes the first fiber reinforced layer 41 mated with the first groove 21 and the second fiber reinforced layer mated with the second groove 31 to have opposite twisting directions therebetween, the adhesive layer 50 is located between the first fiber reinforced layer 41 and the second fiber reinforced layer 42.

When specifically arranged, the bonding layer 50 includes a plurality of bonding points 51, and the plurality of bonding points 51 are periodically arranged at intervals along the surface of the fiber reinforced layer 40, so that the plurality of bonding points 51 continuously form a spiral curve shape, so that part of adjacent fiber yarns in the fiber reinforced layer are bonded.

The adhesive layer is adhered in a non-whole surface coating mode, and is arranged in a spot coating mode. Specifically, a double-component room-temperature-curing heat-resistant adhesive is adopted, wherein the component A is prepared from main raw materials such as epoxy resin, diluent and the like, and has certain thixotropic property; the component B is prepared by taking amines as main raw materials and mixing the amines through reaction; the AB component is mixed according to a certain proportion to prepare the adhesive.

As shown in fig. 5 and 6, the bonding points 51 are dot-shaped bonding areas, and the bonding layer 50 is formed by a plurality of dot-shaped bonding areas, and each dot-shaped bonding point can bond part of the fiber yarns between the adjacent fiber reinforced layers 40. Specifically, as shown in fig. 6, a bonding point 51 is provided between the first fiber reinforced layer 41 and the second fiber reinforced layer 42, that is, bonding is performed between the first fiber yarn and the second fiber yarn through the bonding point 51.

The adhesive is coated on the surface of the inner layer fiber yarn in a periodical dispensing mode, and the adhesive is periodically distributed on the surface of the fiber yarn because the fiber yarn has a certain twisting angle; the dispensing pitch and dispensing pitch distribution can be controlled by the production speed and dispensing interval, and the distribution of the adhesive layer on the fiber yarn layer can be further controlled, so that each adhesive point 51 forms a certain regular spiral shape.

Before solidification, the adhesive is in a liquid state and can well permeate in front of the fiber yarns; after the glue spots are solidified, the fiber yarn layers can be stuck together in a net structure to form a whole; compared with the conventional fiber yarn reinforcing layer of the optical cable, the structure is more compact, the stress is more uniform and sufficient, and the tensile strength of the fiber yarn is exerted to the maximum extent.

Specifically, the dispensing mode in the adhesive layer can be S-curve point-shaped distribution or axial annular interval distribution. The glue sites are distributed as much as possible between two adjacent fiber yarns.

It will be appreciated that by arranging the adhesive layer 50 in spaced dots and eventually forming a spiral configuration, this ensures that the retraction of the trailing cable is not affected by the adhesive effect. Because the towing cable is normally wound on the winch, the towing cable is used by winding and unwinding the winch, so that the towing cable needs to bear repeated bending, the bending of the towing cable is not affected by the hardening of the adhesive on the whole surface through the curved adhesive layer 50, and various performances of the towing cable are improved.

According to an embodiment of the present invention, as shown in fig. 1 and 6, the composite trailing cable further includes a buffer layer 60, where the buffer layer 60 is disposed between the cable core 10 and the inner protection layer 20.

The buffer layer 60 has a certain hardness, which allows compression deformation when receiving the compression force, dispersion and transmission of the buffer force to the cable core 10, and improves the repeated bending resistance of the trailing cable.

When the cable core 10 is specifically arranged, the buffer layer 60 is made of an elastic polymer material, and the buffer layer 60 is coated outside the cable core 10 and is filled in a gap of the cable core 10, so that the buffer layer 60 is directly contacted with the outer wall surface of the cable core 10.

The buffer layer 60 is located between the inner protective layer and the cable core 10, completely covers the periphery of the cable core 10, fills the gap between the optical unit 12 and the electrical unit 11, and longitudinally extends along the cable core 10 to form a circular cylinder; the buffer layer 60 is in direct contact with the cable core 10 and the inner protective layer, respectively, but is not tacky. The buffer layer 60 has a smooth surface and a small friction coefficient between adjacent layers of about 0.15 to 0.30. So that the buffer layer 60 can slide to a certain extent relative to the cable core 10 and the inner sheath when being bent, thereby ensuring good bending performance of the cable core 10.

In a specific embodiment, the cross section of the buffer layer 60 is formed in a honeycomb structure, and the lubricant 61 is coated on the surface of the buffer layer 60, and the lubricant 61 naturally permeates into the buffer layer 60 to provide the buffer layer 60 with a lubricating property.

The cushioning layer 60 is made of a high elastic polymer material, typically ethylene propylene diene monomer. In the preparation process, a chemical foaming agent is added to ensure that the section of the foam is in a honeycomb structure; then, a certain amount of lubricant 61 is coated on the surface of the buffer layer 60, so that the buffer layer 60 has a certain lubricating property through natural permeation, and the friction coefficient of the inner surface and the outer surface of the buffer layer 60 is reduced. Meanwhile, the buffer layer 60 also has a certain water blocking property due to the presence of the lubricant 61, and prevents water from penetrating into the cable core 10 even if the outer sheath is broken.

Through the arrangement of the buffer layer 60, when the towing cable is bent, the buffer layer 60 can slide to a certain extent relative to the cable core 10 and the inner protective layer, so that good bending performance of the cable core 10 is ensured; meanwhile, the buffer layer 60 has a certain hardness, and can be compressed and deformed under the action of external force of extrusion, so that dispersion and buffer pressure are transmitted to the cable core 10; when the external force is removed, the cushioning layer 60 may recover within the range of acceptable compression set. The repeated bending resistance of the towing cable is improved, and the service life of the towing cable in the actual repeated winding and unwinding process is prolonged.

In summary, in the solution of the present invention, by providing grooves on both the inner protective layer 20 and the outer protective layer 30, which can be regarded as two mutually opposite "U" shaped buckle designs, the "U" shaped gaps are filled with fiber yarns, so that slippage between the fiber yarns and the sheath is reduced, the fiber yarns are tightly bound on the inner protective layer by the extrusion of the sheath, and the optical cable is also more compact.

In the production process, vacuumizing treatment is adopted between the inner protective layer and the outer protective layer, firstly, gaps among fiber yarn layers are reduced, and air is less; secondly, the adhesive can be more fully and uniformly permeated along the longitudinal direction of the fiber yarn layer by vacuumizing. The closer the inside of the optical cable is, the higher the hydrostatic pressure resistance which can be born in the axial direction is, and the smaller the influence of the received water pressure is when the optical cable is applied underwater, the larger the applicable water depth is. And the bending resistance and torsion resistance of the optical cable can be improved.

Through the description of the above embodiments, it can be clearly understood by those skilled in the art that the non-metal fiber yarn reinforced armor is adopted in each embodiment, and has the advantages of light weight, small size, high breaking strength and repeated bending resistance, and can ensure the power supply and communication transmission safety of the towing device. Further, by penetrating the lubricant 61 between the buffer layers 60, the buffer layers 60 have a lower friction coefficient when contacting the cable core 10 and the inner sheath, and when being bent, the buffer layers 60 can slide to a certain extent relative to the cable core 10 and the inner sheath, thereby ensuring good bending performance of the cable core 10; meanwhile, the buffer layer 60 has certain hardness, and can generate compression deformation when being acted by external force of extrusion, disperse and buffer pressure to transmit to the cable core 10, so that repeated bending resistance of the towing cable is improved. Further, the non-smooth surfaces of the inner and outer protective layers 30 are uniformly provided with a plurality of spiral grooves which extend continuously along a longitudinal periodic curve, parameters such as a twisting angle, a twisting pitch, a size, a distribution quantity and the like are in linkage matching combination with the fiber yarn layers, so that the problems of abrasion, yarn breakage and the like among the fiber yarns are reduced; meanwhile, the upper and lower grooves are similar to U-shaped buckle design, so that slippage between the fiber yarns and the protective layer is reduced, and the fiber yarns are arranged more regularly and more tightly. Further, the adjacent fiber reinforced layers 40 are adhered together in a net structure through the adhesive points 51 to form a whole, so that the stress is more uniform and sufficient, and the tensile strength of the fiber yarn is exerted to the maximum extent.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite trailing cable, comprising:

A cable core;

2. The composite trailing cable of claim 1, further comprising an adhesive layer disposed between adjacent ones of the fiber-reinforced layers.

3. The composite trailing cable of claim 2, wherein the adhesive layer comprises a plurality of adhesive dots, the plurality of adhesive dots being periodically spaced along the surface of the fiber reinforcement layer, the plurality of adhesive dots continuously forming a spiral curve-like configuration to partially adhere adjacent fiber yarns in the fiber reinforcement layer.

4. The composite trailing cable of claim 1 wherein the cross-sectional areas S of the first and second fiber yarns satisfy the following formula:

；

Wherein s is yarn count density, D is linear density of first fiber yarn or second fiber yarn, and the first fiber yarn and the second fiber yarn are obtained by stranding a plurality of fiber filaments;

；

5. The composite trailing cable of claim 1, wherein the first groove and the second groove each have a pitch L and a strand angle a;

6. The composite trailing cable of claim 1, wherein the same fiber reinforcement layer has the same twist angle α and the pitch of the fiber reinforcement layers increases gradually from inside to outside, the fixed pitch on each armor layer being obtained by the following equation:

；

7. The composite trailing cable of claim 1, wherein the cable core comprises an electrical unit and an optical unit, the electrical unit and the optical unit being stranded.

8. The composite trailing cable of any one of claims 1-7, further comprising a buffer layer disposed between the cable core and the inner protective layer.

9. The composite trailing cable of claim 8, wherein the buffer layer is made of an elastic polymeric material, and the buffer layer is wrapped outside the cable core and filled in the void of the cable core so that the buffer layer is in direct contact with the outer wall surface of the cable core.

10. The composite trailing cable of claim 8, wherein the buffer layer has a honeycomb structure formed in a cross section and a lubricant is coated on a surface of the buffer layer, the lubricant naturally penetrating into the buffer layer to impart lubrication properties to the buffer layer.