Zero buoyancy optoelectronic composite longitudinal watertight cable and its manufacturing method and use

Abstract

The present invention discloses a zero-buoyancy optoelectronic composite longitudinal watertight cable, which has an outer layer and a wire group, wherein the wire group is arranged in the outer layer; the wire group has an optical unit and an electrical unit, wherein the electrical unit has an electric wire, wherein the electric wire has a conductor, wherein the conductor is formed by twisting silver-plated copper wires, the conductor is filled with water-blocking glue, and a first cross-linked polyethylene insulator is extruded outside the conductor; the optical unit has a single-mode optical fiber, a stainless steel bundle tube is arranged outside the single-mode optical fiber, water-blocking glue is filled between the single-mode optical fiber and the stainless steel bundle tube, a sheath is extruded outside the stainless steel bundle tube, a ground wire has a ground wire conductor, and a second cross-linked polyethylene insulator is extruded outside the ground wire conductor; the outer layer has a wrapping layer, an inner sheath, a tensile layer, a foaming layer, and an outer sheath arranged from the inside to the outside; a solid filler and a water-blocking glue are arranged between the outer layer and the wire group. The present invention also discloses a method for making and using a zero-buoyancy optoelectronic composite longitudinal watertight cable. The present invention can be suspended at any position in the water, has good tensile properties, meets the transmission requirements of electrical and optical signals, has good longitudinal water-blocking properties, and has a high current carrying capacity of the conductor.

Description

Technical Field

[0001] The invention relates to a cable, in particular to a zero-buoyancy photoelectric composite longitudinal watertight cable and a manufacturing method and application thereof. Background Art

[0002] When underwater equipment is working, it needs a zero-buoyancy optoelectronic composite longitudinal watertight cable to realize power supply and communication. Due to the complex working environment, the requirements for the cable are high. In the prior art, although the patent with announcement number CN215118367U and the name of longitudinal watertight underwater robot zero buoyancy floating cable discloses a longitudinal watertight cable, it also has shortcomings, such as the longitudinal watertightness and tensile performance need to be improved. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and to provide a zero-buoyancy optoelectronic composite longitudinal watertight cable with good longitudinal watertightness, high tensile strength and conductor current carrying capacity.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical solution: a zero-buoyancy photoelectric composite longitudinal watertight cable, characterized in that it has an outer layer and a wire group, and the wire group is arranged in the outer layer;

[0005] The line group comprises an optical unit and an electrical unit, the electrical unit comprises an electric wire, the electric wire comprises a conductor, the conductor is formed by twisting silver-plated copper wires, the conductor is filled with water-blocking glue, and the conductor is extruded with a first cross-linked polyethylene insulator, the optical unit comprises a single-mode optical fiber, a stainless steel bundle tube is arranged outside the single-mode optical fiber, water-blocking glue is filled between the single-mode optical fiber and the stainless steel bundle tube, a sheath is extruded outside the stainless steel bundle tube, and the ground wire comprises a ground wire conductor, and the ground wire conductor is extruded with a second cross-linked polyethylene insulator;

[0006] The outer layer comprises a wrapping layer, an inner sheath, a tensile layer, a foaming layer and an outer sheath arranged from the inside to the outside;

[0007] Wherein, a solid filling body and a water-blocking adhesive are arranged between the outer layer and the wire group.

[0008] Further: the wrapping layer is made of water-blocking tape, and the overlapping rate is not less than 30%.

[0009] Further: the outer sheath is made of polyether polyurethane, the inner sheath is made of polyether polyurethane, and the sheath is made of high-density polyethylene material.

[0010] Further: the foaming layer is made of foamed polyurethane.

[0011] Further: the tensile layer is in the form of a double layer, and is formed by forward and reverse winding of high modulus fibers, wherein the high modulus fibers are formed by stranding single fiber bundles, and the single fibers are impregnated with water-blocking adhesive.

[0012] On the other hand, a method for manufacturing the zero-buoyancy optoelectronic composite longitudinal watertight cable as described above is characterized by comprising the following steps:

[0013] The steps of making the electric wire are as follows: silver-plated copper wires are twisted into a conductor, the conductor is filled with water-blocking glue, and a first cross-linked polyethylene insulator is extruded outside the conductor, wherein the water-blocking glue is filled with a glue injection mold, and the glue injection mold has a molding part and a sizing part which are arranged in sequence, the molding part has a bell mouth, and a glue injection tube is arranged at the bell mouth of the molding part, a locking sleeve is arranged at the sizing part, and a nano-plating layer is arranged on the inner surface of the sizing part;

[0014] The steps of making the optical fiber are as follows: a stainless steel bundle tube is arranged outside the single-mode optical fiber, a water-blocking glue is injected between the single-mode optical fiber and the stainless steel bundle tube, and a sheath is extruded outside the stainless steel bundle tube;

[0015] The steps of making high modulus fiber include: impregnating a single fiber with water-blocking glue, and bundling the single fibers into strands to make high modulus fiber; wherein, when bundling, a glue injection mold is used to fill the water-blocking glue, and the glue injection mold has a molding part and a sizing part which are arranged in sequence, the molding part has a bell mouth, and a glue injection tube is arranged at the bell mouth of the molding part, a locking sleeve is arranged at the sizing part, and a nano-plating layer is arranged on the inner surface of the sizing part, and the glue injection mold is used to inject glue, and the fibers are gradually bundled into strands to make a fiber rope;

[0016] The cabling step is to arrange the conductors, optical fibers, ground wires and solid fillers in a clockwise direction and twist them into cables, fill the gaps in the cabling with water-blocking glue, and the cabling direction is right-handed; at the same time, wrap the water-blocking tape to form a wrapping layer, and the overlap rate is not less than 50%;

[0017] The step of extruding the inner sheath;

[0018] The steps of winding the tensile layer are as follows: the first tensile layer is wound by a cage stranding machine with at least 36 coils, and the fiber rope is impregnated and filled with water-blocking glue. The tension of each fiber rope should be uniform and consistent, and the winding direction is left-handed. The angle between the fiber rope and the cable axis should be controlled between 30 and 45 degrees, and 100% coverage should be achieved. At the same time, aramid is wound sparsely to fix the winding layer and prevent it from loosening. The same equipment and control method are used to wind the second tensile layer, and the winding direction is right-handed. Water-blocking glue should be injected when winding each layer:

[0019] In the step of extruding the foam layer, a special disc is used for winding to prevent the foam layer from being deformed by extrusion. The ratio of the outer diameter to the inner diameter of the disc is 2:1.6:

[0020] The step of extruding the outer protective layer, in which an extrusion mold is used for extrusion so that the thickness after extrusion is small, the outer diameter fluctuation range is small, and the surface is smooth and round. The extrusion mold has an inner mold and a stepped outer mold. The inner mold has a channel. The channel has a tapered section and a columnar section arranged in sequence. A flow channel is provided between the inner mold and the stepped outer mold. A buffer structure is provided on the outer wall of the flow channel. The buffer chamfer in the buffer structure is 160-170 degrees, wherein the side wall roughness of the flow channel is 0.6-0.9μm.

[0021] Furthermore, in the cabling step, when the cabling is filled, the water-blocking glue is fully combined with the solid filling, and the glue is injected through the glue injection mold to ensure full filling. The glue injection mold has a molding part and a sizing part arranged in sequence, the molding part has a bell mouth, and the molding part is provided with a glue injection tube at the bell mouth, the sizing part is provided with a locking sleeve, and the inner surface of the sizing part is provided with a nano-coating.

[0022] Furthermore, the water-blocking adhesive used includes the following components in parts by weight: 62% of organic silane, 10% of titanium dioxide, 15% of white carbon black, 7% of silicone resin, 5% of dioctyl phthalate, and 1% of dibutyl tin.

[0023] On the other hand, a use of the zero-buoyancy optoelectronic composite longitudinal watertight cable made by the manufacturing method as described above is applied in underwater sonar equipment.

[0024] Compared with the prior art, the present invention has the following beneficial effects: the longitudinal watertight cable in the present invention is freely suspended at any position in the water, and the longitudinal watertight cable meets the transmission requirements of electrical signals and optical signals while meeting the working tension requirement (≥5kN); the longitudinal watertight cable meets the longitudinal water-blocking requirement and has good performance; the conductor in the longitudinal watertight cable has a 20% higher current carrying capacity than conductors with the same cross-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of the zero-buoyancy optoelectronic composite longitudinal watertight cable in Example 1.

[0026] Figure 2 This is the structural diagram of the glue injection mold in Example 2.

[0027] Figure 3 This is the structural diagram of the extrusion die in Example 2.

[0028] Figure 4 This is a structural diagram of the disk in Example 2. DETAILED DESCRIPTION

[0029] Example 1

[0030] See also Figure 1 A zero-buoyancy optoelectronic composite longitudinal watertight cable comprises an outer layer and a wire group, wherein the wire group is arranged in the outer layer.

[0031] The wire group has an optical unit and an electrical unit. The electrical unit has an electric wire. The electric wire has a conductor 11. The conductor 11 is formed by twisting silver-plated copper wires. The conductor 11 is filled with water-blocking glue. The conductor 11 is extruded with a first cross-linked polyethylene insulator 12. In the embodiment, there are three wires, which are distributed in a herringbone shape. The conductor is a silver-plated copper conductor, which increases the current carrying capacity of the same conductor cross-section by 20%. The cross-linked polyethylene material in the first cross-linked polyethylene insulator 12 has high dielectric strength, a temperature resistance level of up to 90°C, a light specific gravity, and increased current carrying capacity.

[0032] The optical unit has a single-mode optical fiber 51, a stainless steel bundle tube 52 is arranged outside the single-mode optical fiber 51, a water-blocking glue is filled between the single-mode optical fiber 51 and the stainless steel bundle tube 52, and a sheath 53 is extruded outside the stainless steel bundle tube 52. In the embodiment, the number of single-mode optical fibers is 9, and other numbers can be designed according to needs.

[0033] The ground wire has a ground wire conductor 21, and the ground wire conductor 21 is extruded with a second cross-linked polyethylene insulator 22. In the embodiment, the number of the ground wire is one.

[0034] The outer layer has a wrapping layer 41, an inner sheath 42, a tensile layer 43, a foaming layer 44, and an outer sheath 45 arranged from the inside to the outside; wherein, a solid filler 31 and a water-blocking adhesive 32 are arranged between the outer layer and the wire group. The solid filler is made of polyethylene material, which has a light specific gravity and is compatible with the water-blocking adhesive to form an effective water-blocking whole. The water-blocking adhesive is used to fill the gap, and the water-blocking adhesive does not need to be cured and has a stable shape. The specific gravity of the solid filler and the water-blocking adhesive is less than 1g / cm 3 In the embodiment, the number of solid filling bodies is 2, namely a first solid filling body and a second solid filling body. The first solid filling body is arranged in the middle of the line group, and the second solid filling body is arranged outside the line group.

[0035] In this embodiment, the wrapping layer 41 is made of a water-blocking tape, and the overlapping rate is not less than 30%.

[0036] In this embodiment, the outer sheath 45 is made of polyether polyurethane.

[0037] In this embodiment, the foaming layer 44 is made of foamed polyurethane.

[0038] In this embodiment, the inner sheath 42 is made of polyether polyurethane, which is beneficial to the vulcanization connection of the connector.

[0039] In this embodiment, the tensile layer is in the form of a double layer, and is formed by forward and reverse winding of high modulus fibers, wherein the high modulus fibers are formed by bundling single fibers, and the single fibers are impregnated with water-blocking adhesive.

[0040] In this embodiment, the sheath 53 is made of high-density polyethylene material.

[0041] The density of fresh water is 1g / cm 3 The density of the cable is the weight of the finished cable per unit length divided by the volume of the finished cable per unit length. By precisely controlling the weight and outer diameter of the cable, the cable density of 1g / cm 3 ±1% to achieve free suspension of the cable at any position in the water. The product of the invention has good longitudinal water blocking and tensile properties and meets the use requirements of composite longitudinal watertight cables.

[0042] Example 2

[0043] In this embodiment, the longitudinal watertight cable in Embodiment 1 is manufactured.

[0044] The structures and numbers of the injection mold and the extrusion mold involved in this embodiment are as follows: 61 molding part, 611 injection tube, 62 sizing part, 63 locking sleeve. 70 channel, 71 inner mold, 71a inner mold mouth, 72 stepped outer mold, 73 flow channel, 721 buffer chamfer, A cable after cabling, B cable after extrusion, C molding area. The mold is used for injection, and the water-blocking glue is easy to add, the water-blocking glue can be fully filled, and the water-blocking glue filling effect is excellent.

[0045] This embodiment relates to a method for manufacturing a zero-buoyancy optoelectronic composite longitudinal watertight cable, which comprises the following steps:

[0046] The steps of making the electric wire are as follows: silver-plated copper wires are twisted into conductors, the conductors are filled with water-blocking glue, and a first cross-linked polyethylene insulator is extruded outside the conductors, wherein the water-blocking glue is filled with a glue injection mold, and the glue injection mold has a molding part and a sizing part arranged in sequence, the molding part has a bell mouth, and the molding part is provided with a glue injection tube at the bell mouth, the sizing part is provided with a locking sleeve, and the inner surface of the sizing part is provided with a nano-coating. The water-blocking glue is added from the glue injection tube, the conductor part enters from the bell mouth of the molding part, and then exits from the sizing part. The glue injection mold here is arranged at the sizing mold position of the stranding machine and replaces the conventional sizing mold.

[0047] The steps of making the optical fiber are as follows: a stainless steel bundle tube is arranged outside the single-mode optical fiber, a water-blocking glue is injected between the single-mode optical fiber and the stainless steel bundle tube, and a sheath is extruded outside the stainless steel bundle tube.

[0048] The steps of making high modulus fiber are: impregnating a single fiber with water-blocking glue, and bundling the single fibers into strands to make high modulus fiber; wherein, when bundling, a glue injection mold is used to fill the water-blocking glue, and the glue injection mold has a molding part and a sizing part arranged in sequence, the molding part has a bell mouth, and a glue injection tube is arranged at the bell mouth of the molding part, and a locking sleeve is arranged at the sizing part, and a nano-coating is arranged on the inner surface of the sizing part, and the glue injection mold is used to inject glue, and the fibers are gradually bundled into strands to make a fiber rope. The glue injection tube is used to inject water-blocking glue, and the fibers enter from the bell mouth of the molding part and exit from the sizing part. The glue injection mold here is arranged at the die position of the bundler and replaces the conventional die.

[0049] The cabling step is to arrange the conductors, optical fibers, ground wires and solid fillers in a clockwise direction and twist them into cables. The gaps in the cabling are filled with water-blocking glue, and the cabling direction is right. At the same time, wrap the water-blocking tape to form a wrapping layer with an overlap rate of not less than 50%. The wires should be neatly arranged on the take-up reel.

[0050] Steps for extruding the inner jacket.

[0051] The steps of winding the tensile layer are as follows: the first tensile layer is wound by a cage stranding machine with at least 36 coils, and the fiber rope impregnated and filled with water-blocking glue is used. The tension of each fiber rope should be uniform and consistent, and the winding direction is left-handed. The angle between the fiber rope and the cable axis should be controlled between 30 and 45 degrees, and 100% coverage should be achieved. At the same time, aramid is wound sparsely to fix and prevent the winding layer from loosening; the second tensile layer is wound by the same equipment and control method, and the winding direction is right-handed. Water-blocking glue should be injected when each layer is wound.

[0052] The step of extruding the foam layer.

[0053] The step of extruding the outer sheath, in which an extrusion die (see Figure 3 ) extrusion makes the thickness after extrusion small, the outer diameter fluctuation range small, and smooth and round. The extrusion mold has an inner mold and a stepped outer mold. The inner mold has a channel. The channel has a tapered section and a columnar section arranged in sequence. There is a flow channel (for passing the extrusion fluid) between the inner mold and the stepped outer mold. The outer wall of the flow channel is provided with a buffer structure. The buffer chamfer in the buffer structure is 160-170 degrees (preferably 165 degrees), wherein the side wall of the flow channel (the inner wall surface of the outer mold and the outer wall surface of the inner mold) has a roughness of 0.6-0.9μm (preferably 0.8μm). The inner mold die mouth 71a is lengthened (partially extended to the outside of the outer mold), and the design of the stepped outer mold and the buffer chamfer (specific chamfer value) can reduce the extrusion pressure, cooperate with reducing the surface roughness (specific roughness) of the flow channel part of the inner mold outer wall and the outer mold inner wall, and the overall design, the combined effect makes the thickness after extrusion small, the outer diameter fluctuation range small, and smooth and round.

[0054] In the cabling step of this embodiment, when the cabling is filled, the water-blocking glue is fully combined with the solid filling, and the glue is injected through the glue injection mold to ensure full filling. The glue injection mold has a molding part and a sizing part arranged in sequence, the molding part has a bell mouth, and the molding part is provided with a glue injection tube at the bell mouth, the sizing part is provided with a locking sleeve, and the inner surface of the sizing part is provided with a nano-coating. The glue injection tube is used to inject water-blocking glue, and the cable enters from the bell mouth of the molding part and exits from the sizing part. The glue injection mold here is set at the compression mold position of the cabling machine and replaces the conventional compression mold.

[0055] In the step of extruding the foaming layer in this embodiment, a special disc with a large inner diameter and a large width is used for winding to prevent the foaming layer from being deformed by force extrusion. The ratio of the outer diameter to the inner diameter of the disc is 2:1.6 (the ratio of the outer diameter to the inner diameter of a conventional disc is 2:1, and a disc of this size is prone to cause the foaming layer to be deformed by force extrusion during use), and the width of the disc is increased. Specifically, the inner diameter of the disc is 1600 mm, the outer diameter is 2000 mm, the width of the disc is 1800 mm, and the disc is a stainless steel disc.

[0056] It should be noted that from the conductor production to the final outer sheath process, the size and weight should be strictly controlled in each production process to finally meet the cable density of 1g / cm 3 ±1% to enable the cable to float freely at any position in the water.

[0057] Example 3

[0058] In addition to using the water-blocking glue in the prior art, in order to improve the watertightness, the water-blocking glue used in the manufacturing method of Example 2 uses the water-blocking glue in this embodiment.

[0059] A water-blocking adhesive comprises the following components in parts by weight: 62% of organic silane, 10% of titanium dioxide, 15% of white carbon black, 7% of silicone resin, 5% of dioctyl phthalate and 1% of dibutyl tin.

[0060] Test requirements: Watertight test is generally carried out according to GJB1916 standard, requiring sample length of 1.5±0.05m, water pressure of 6.75MPa, duration of 6 hours, and qualified test result judgment criteria: ① After the test, the amount of water seeping out of the free end of the sample does not exceed the corresponding specified value; ② Any component at the end of the sample exposed in the water tank has a displacement of no more than 6.4mm relative to the jacket of the sample. The present invention controls the process and materials, and under the same test conditions, the water seepage result is watertight and the displacement is 0.

[0061] Example 4

[0062] This embodiment relates to the use of a zero-buoyancy optoelectronic composite longitudinal watertight cable. The zero-buoyancy optoelectronic composite longitudinal watertight cable in Embodiment 1, or the zero-buoyancy optoelectronic composite longitudinal watertight cable produced in Embodiment 2, or the zero-buoyancy optoelectronic composite longitudinal watertight cable produced in Embodiment 3 is applied to underwater sonar equipment.

[0063] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. All technical solutions belonging to the principle of the present invention belong to the protection scope of the present invention. For those skilled in the art, several improvements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for manufacturing a zero-buoyancy optoelectronic composite longitudinal watertight cable, characterized in that: The zero-buoyancy optoelectronic composite longitudinal watertight cable comprises an outer layer and a wire group, wherein the wire group is arranged inside the outer layer; the wire group comprises an optical unit and an electrical unit, wherein the electrical unit comprises an electric wire, wherein the electric wire comprises a conductor (11), wherein the conductor (11) is formed by twisting silver-plated copper wires, wherein the conductor (11) is filled with a water-blocking adhesive, wherein a first cross-linked polyethylene insulator (12) is extruded outside the conductor (11), wherein the optical unit comprises a single-mode optical fiber (51), wherein a stainless steel bundle tube (52) is arranged outside the single-mode optical fiber (51), and wherein the single-mode optical fiber (51) comprises a plurality of A water-blocking glue is filled between the stainless steel bundle tube (52), a sheath (53) is extruded outside the stainless steel bundle tube (52), the ground wire comprises a ground wire conductor (21), and a second cross-linked polyethylene insulator (22) is extruded outside the ground wire conductor (21); the outer layer comprises a wrapping layer (41), an inner sheath (42), a tensile layer (43), a foaming layer (44), and an outer sheath (45) arranged from the inside to the outside; wherein a solid filling body (31) and a water-blocking glue (32) are arranged between the outer layer and the wire group; The production method has the following steps: The steps of making the electric wire are as follows: silver-plated copper wires are twisted into a conductor, the conductor is filled with water-blocking glue, and a first cross-linked polyethylene insulator is extruded outside the conductor, wherein the water-blocking glue is filled with a glue injection mold, and the glue injection mold has a molding part and a sizing part which are arranged in sequence, the molding part has a bell mouth, and a glue injection tube is arranged at the bell mouth of the molding part, a locking sleeve is arranged at the sizing part, and a nano-plating layer is arranged on the inner surface of the sizing part; The steps of making the optical fiber are as follows: a stainless steel bundle tube is arranged outside the single-mode optical fiber, a water-blocking glue is injected between the single-mode optical fiber and the stainless steel bundle tube, and a sheath is extruded outside the stainless steel bundle tube; The steps of making high modulus fiber include: impregnating a single fiber with water-blocking glue, and bundling the single fibers into strands to make high modulus fiber; wherein, when bundling, a glue injection mold is used to fill the water-blocking glue, and the glue injection mold has a molding part and a sizing part which are arranged in sequence, the molding part has a bell mouth, and a glue injection tube is arranged at the bell mouth of the molding part, a locking sleeve is arranged at the sizing part, and a nano-plating layer is arranged on the inner surface of the sizing part, and the glue injection mold is used to inject glue, and the fibers are gradually bundled into strands to make a fiber rope; The cabling step is to arrange the conductors, optical fibers, ground wires and solid fillers in a clockwise direction and twist them into cables. The gaps in the cabling are filled with water-blocking glue, and the cabling direction is right-handed. At the same time, the water-blocking tape is wrapped to form a wrapping layer, and the overlap rate is not less than 50%; The step of extruding the inner sheath; The steps of winding the tensile layer are as follows: the first tensile layer is wound by a cage stranding machine with at least 36 coils, and the fiber rope impregnated and filled with water-blocking glue is used. The tension of each fiber rope should be uniform and consistent, and the winding direction is left-handed. The angle between the fiber rope and the cable axis should be controlled between 30 and 45 degrees, and 100% coverage should be achieved. At the same time, aramid is sparsely wound to fix the winding layer and prevent it from loosening. The same equipment and control method are used to wind the second tensile layer, and the winding direction is right-handed. Water-blocking glue should be injected when each layer is wound: In the step of extruding the foam layer, a special disc is used for winding to prevent the foam layer from being deformed by extrusion. The ratio of the outer diameter to the inner diameter of the disc is 2:1.6: The step of extruding the outer protective layer, in which an extrusion mold is used for extrusion so that the thickness after extrusion is small, the outer diameter fluctuation range is small, and the surface is smooth and round. The extrusion mold has an inner mold and a stepped outer mold. The inner mold has a channel. The channel has a tapered section and a columnar section arranged in sequence. A flow channel is provided between the inner mold and the stepped outer mold. A buffer structure is provided on the outer wall of the flow channel. The buffer chamfer in the buffer structure is 160-170 degrees, wherein the side wall roughness of the flow channel is 0.6-0.9μm.

2. The method according to claim 1, characterized in that: In the cabling step, when the cable is filled, the water-blocking glue is fully combined with the solid filling, and the glue is injected through the glue injection mold to ensure full filling. The glue injection mold has a molding part and a sizing part arranged in sequence, the molding part has a bell mouth, and the molding part is provided with a glue injection tube at the bell mouth, the sizing part is provided with a locking sleeve, and the inner surface of the sizing part is provided with a nano-coating.

3. The method according to claim 1, characterized in that: The water-blocking adhesive used includes the following components, measured by weight: 62% organic silane, 10% titanium dioxide, 15% white carbon black, 7% silicone resin, 5% dioctyl phthalate, and 1% dibutyl tin.

4. The method according to claim 1, characterized in that: The wrapping layer (41) is made of a water-blocking tape, and the overlap rate is not less than 30%.

5. The method according to claim 1, characterized in that: The outer sheath (45) is made of polyether polyurethane, the inner sheath (42) is made of polyether polyurethane, and the sheath (53) is made of high-density polyethylene material.

6. The method according to claim 1, characterized in that: The foaming layer (44) is made of foamed polyurethane.

7. The manufacturing method according to claim 1, characterized in that: The tensile layer is a double-layered layer, which is formed by winding high modulus fibers in forward and reverse directions, wherein the high modulus fibers are formed by bundling single fibers, and the single fibers are impregnated with water-blocking adhesive.

8. Use of a zero-buoyancy optoelectronic composite longitudinal watertight cable made by the method according to any one of claims 1 to 3, characterized in that: Used in underwater sonar equipment.

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