A central tube type anti-bite and high temperature resistant optical cable

Abstract

The invention discloses a central tube type anti-bite and pecking high temperature resistant optical cable, comprising a cable core, a loose tube, a water blocking tape, a glass fiber armor layer, a fire-resistant composite tape and a ceramic composite layer, wherein the cable core is composed of a plurality of single-core optical fibers, each of which includes a core, a cladding, a coating layer and an insulating skin from the inside to the outside, wherein the coating layer is specifically a silver conductive paint; the glass fiber armor layer is specifically a glass fiber plastic rod distributed in an annular manner twisted outside the loose tube; the ceramic composite layer is embedded with a reinforcing core distributed in an annular manner, the reinforcing core is formed by twisting two fiber-reinforced composite wires, the reinforcing core is soaked with a rodent repellent, the water blocking tape is specifically a highly absorbent mixture, the outer portion of the loose tube is provided with a spiral groove distributed along the axial direction, and a copper wire bundle is wound inside the spiral groove. The optical cable of the invention has the characteristics of light weight, good anti-bite and pecking, convenient construction, wide application range, etc., and provides a better solution for optical communication in areas with serious rodent damage such as mountainous areas, urban sewers, and forest areas with serious bird damage.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a central tube type anti-bite and high temperature resistant optical cable. Background Art

[0002] At present, the structure of anti-rat and anti-bird optical cables on the market mainly adopts metal armor. The metal armor layer is very hard, and it is difficult for rodents to bite and peck through it, but this optical cable is heavy, difficult to construct and has high production costs; in various fires, the optical cable may act as a fuse, causing the fire to spread rapidly, affecting the normal operation of the communication line or even paralyzing it, especially in mountainous areas, where the fire prevention function is even more important. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a central tube type anti-bite and high temperature resistant optical cable.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A central tube type anti-bite and pecking high temperature resistant optical cable comprises a cable core, a loose tube wrapped outside the cable core, a water blocking tape wrapped outside the loose tube, a glass fiber armor layer wrapped outside the water blocking tape, a fire-resistant composite tape wrapped outside the glass fiber armor layer, and a ceramic composite layer extruded outside the fire-resistant composite tape. The cable core is composed of multiple single-core optical fibers, and each single-core optical fiber comprises a core, a cladding, a coating layer and an insulating skin from the inside to the outside; the glass fiber armor layer is specifically annularly distributed glass fiber plastic rods twisted on the outer surface of the loose tube; an annularly distributed strengthening core is embedded in the ceramic composite layer, and the strengthening core is formed by twisting two fiber-reinforced composite wires.

[0006] Furthermore, the material of the ceramic composite layer is silicone rubber, which contains 2% glass fiber, 3% mica and 2.5% activated carbon, and the preparation method thereof is as follows:

[0007] 1) Mix at 100-120℃ for 1-2h;

[0008] 2) Under oxygen and water-free conditions, under a pressurized atmosphere of 1-2 MPa, rapidly melt at 280-300°C, extrude and granulate to obtain the rubber material required for the ceramic composite layer.

[0009] Further, the fiber-reinforced composite wire specifically refers to any one of glass fiber, carbon fiber, boron fiber, aramid fiber, alumina fiber or silicon carbide fiber; the reinforcing core is subjected to an immersion treatment, and the immersion treatment includes the following steps:

[0010] 1) The twisted reinforcing core is placed in an aqueous solution containing 1% strychnine, 1.5% capsaicin and 2.2% onion extract by weight and soaked for 1-2 hours;

[0011] 2) Dry the reinforcing core with hot air at 60℃, distribute the reinforcing core carrying powder in a ring around the refractory composite belt, and make a gap between the reinforcing core and the refractory composite belt, and extrude the rubber material filling the ceramic composite layer on the outer surface of the refractory composite belt to finally form it.

[0012] Furthermore, the fire-resistant composite tape is specifically a RUB-SIL (CCT) type ceramic fire-resistant composite tape, and the fire-resistant composite tape is wrapped around or longitudinally wrapped on the outer surface of the glass fiber armor layer.

[0013] Furthermore, the glass fiber plastic rods in the glass fiber armor layer are specifically twisted by cage twisting.

[0014] Furthermore, the water-blocking tape is specifically a highly water-absorbent mixture. The preparation method of the highly water-absorbent mixture is as follows: lightly cross-linked sodium polyacrylate, sodium polybenzene sulfonate, nylon 6 and nylon 46 are stirred and mixed in a weight ratio of 1:0.5:0.3:0.2, added into a mixer, kneaded at 80-120°C for 2h, irradiated with cobalt 60 gamma rays under stirring for 30min, taken out and melt-extruded, spun, and woven into a thin tape with a width of 1-1.5cm and a thickness of 0.1-0.13mm to obtain a finished water-blocking tape.

[0015] Furthermore, the loose sleeve is provided with a spiral groove distributed along the axial direction, the cross-sectional shape of the spiral groove is specifically square or semicircular, a copper wire bundle is wound in the spiral groove, the spiral trajectory of the spiral groove basically coincides with the spiral trajectory of the copper wire bundle, and most of the copper wire bundle is placed in the spiral groove.

[0016] Furthermore, the outer surface of the fiber core is a smooth dust-free surface, the surface of the fiber core is polished and soot-blown, the cladding is specifically made of silicone rubber, the coating layer is specifically made of silver conductive paint, and the insulating skin is specifically made of nitrile rubber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention adopts a loose tube sleeve with a spiral groove as the central bundle tube of the optical fiber, and arranges a copper wire bundle in the spiral groove to improve the tensile strength, thermal conductivity and anti-interference performance of the central bundle tube;

[0019] By using a highly water-absorbent mixture as a water-blocking tape, a "dry-packed" central tube optical cable is formed mainly by absorbing water. No waterproof ointment is added, which has good water absorption effect and low specific gravity. When heated, the volume of the water-blocking tape changes greatly, which has a buffering and energy-absorbing effect, and changes the volume expansion into radial force, further reducing the axial force.

[0020] Glass fiber plastic rods are used to evenly distribute the cable core on the surface of the cable through cage twisting to form a glass fiber armor layer, which is lighter than metal. In addition, when the surface of the glass fiber composite plastic rod is damaged, the glass fiber will fall off and can pierce the mouths of rodents and birds, preventing the cable core from being further damaged.

[0021] The reinforcing core 7 is made of fiber-reinforced composite wires twisted together to bear the axial tension. At the same time, it is impregnated with a rodent-proof agent with a pungent odor, and the material is environmentally friendly, edible, and low-toxic substances. It is mainly used to drive away rats and birds, not to kill them;

[0022] The refractory composite belt produces Mg(OH) after combustion. 2 The oxide hard shell-ceramic protective layer can achieve the purpose of flame retardancy, reduce the transfer of heat to the inside of the optical cable during combustion, and reduce the impact of high temperature on the optical fiber;

[0023] The outer sheath is made of ceramic composite material, which will quickly harden and gradually ceramicize under high temperature and combustion process, forming a dense and hard ceramic shell oxygen insulation layer, which increases the overall fire resistance and high temperature resistance of the optical cable.

[0024] In summary, the optical cable of the present invention has the characteristics of light weight, good anti-biting and pecking, convenient construction, and wide application range, and provides a better solution for optical communications in areas with serious rodent infestation such as mountainous areas and urban sewers, as well as forest areas with serious bird infestation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional structural diagram of a central tube type anti-bite and high temperature resistant optical cable proposed by the present invention;

[0026] Figure 2 This is a structural analysis diagram of a central tube type anti-bite and high temperature resistant optical cable proposed by the present invention;

[0027] Figure 3 This is a schematic structural diagram of a cable core of a central tube type anti-bite and pecking high temperature resistant optical cable proposed by the present invention;

[0028] In the figure: cable core 1, fiber core 101, cladding 102, coating layer 103, insulation skin 104, loose tube 2, spiral groove 201, copper wire bundle 202, water blocking tape 3, glass fiber armor layer 4, fire-resistant composite tape 5, ceramic composite layer 6, and reinforcing core 7. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Reference Figure 1-3A central tube type anti-bite and pecking high temperature resistant optical cable comprises a cable core 1, a loose tube 2 wrapped outside the cable core 1, a water blocking tape 3 wrapped outside the loose tube 2, a glass fiber armor layer 4 wrapped outside the water blocking tape 3, a fire-resistant composite tape 5 wrapped outside the glass fiber armor layer 4, and a ceramic composite layer 6 extruded outside the fire-resistant composite tape 5. The cable core 1 is composed of multiple single-core optical fibers, and each single-core optical fiber includes a core 101, a cladding 102, a coating layer 103 and an insulating skin 104 from the inside to the outside; the glass fiber armor layer 4 is specifically an annularly distributed glass fiber plastic rod twisted on the outer surface of the loose tube 2; an annularly distributed strengthening core 7 is embedded in the ceramic composite layer 6, and the strengthening core 7 is formed by twisting two fiber-reinforced composite wires.

[0031] In the present invention, the material of the ceramic composite layer 6 is silicone rubber, which contains 2% glass fiber, 3% mica and 2.5% activated carbon, and the preparation method thereof is as follows:

[0032] 1) Mix at 100-120℃ for 1-2h;

[0033] 2) Under oxygen-free and water-free conditions and under a pressurized atmosphere of 1-2 MPa, the rubber material required for the ceramic composite layer 6 is obtained by rapid melting at 280-300°C and extruding and granulating.

[0034] The ceramic composite layer 6 is made of inorganic doped silicone rubber and uses a melt extrusion granulation method to fully promote the uniform mixing of the components. Activated carbon is added to waterproof and remove gas during cable melting and molding, improve density, and make the cable's volume change less when affected by temperature differences, which is beneficial to reducing the excess length of the loose tube 2.

[0035] In the present invention, the fiber-reinforced composite wire specifically refers to any one of glass fiber, carbon fiber, boron fiber, aramid fiber, alumina fiber or silicon carbide fiber; the reinforcing core 7 is subjected to an immersion treatment, and the immersion treatment includes the following steps:

[0036] 1) The twisted reinforcing core 7 is placed in an aqueous solution containing 1% strychnine, 1.5% capsaicin and 2.2% onion extract by weight, and soaked for 1-2 hours;

[0037] 2) Dry the reinforcing core 7 with hot air at 60°C, distribute the reinforcing core 7 carrying powder in a ring around the refractory composite belt 5, and leave a gap between the reinforcing core 7 and the refractory composite belt 5, and extrude the rubber material filling the ceramic composite layer 6 together on the outer surface of the refractory composite belt 5 to finally form it.

[0038] The reinforcing core 7 bears the axial tension and is impregnated with a rodent-proof agent having a pungent odor. The material is an environmentally friendly, edible, low-toxic substance, which is mainly used to drive away rats and birds, not to kill them.

[0039] In the present invention, the refractory composite tape 5 is specifically a RUB-SIL (CCT) type ceramic fireproof composite tape, and the refractory composite tape 5 is wrapped around or longitudinally wrapped on the outer surface of the glass fiber armor layer 4. The refractory composite tape 5 generates Mg (OH) after combustion. 2 The oxide hard shell-ceramic protective layer can achieve the purpose of flame retardancy, reduce the transfer of heat to the inside of the optical cable during combustion, and reduce the impact of high temperature on the optical fiber.

[0040] In the present invention, the glass fiber plastic rod in the glass fiber armor layer 4 is specifically twisted by cage twisting to form a woven mesh with a certain toughness, which protects the optical cable and can withstand axial tension; because the glass fiber will fall off when the surface of the glass fiber composite plastic rod is damaged, it can pierce the mouths of rodents and birds, preventing the cable core from being further damaged.

[0041] In the present invention, the water-blocking tape 3 is specifically a highly water-absorbent mixture. The preparation method of the highly water-absorbent mixture is as follows: lightly cross-linked sodium polyacrylate, sodium polybenzene sulfonate, nylon 6 and nylon 46 are stirred and mixed in a weight ratio of 1:0.5:0.3:0.2, added to a mixer, kneaded at 80-120°C for 2 hours, irradiated with cobalt 60 gamma rays under stirring for 30 minutes, taken out and melt-extruded, spun, and woven into a thin strip with a width of 1-1.5 cm and a thickness of 0.1-0.13 mm to obtain a finished water-blocking tape.

[0042] The water-blocking tape 3 is made of a highly water-absorbent mixture, which mainly absorbs water to form a "dry-packed" central tube optical cable. No waterproof ointment is added, and it has good water absorption effect and small specific gravity. When heated, the volume of the water-blocking tape 3 changes greatly, which has a buffering and energy-absorbing effect, and changes the volume expansion into radial force, further reducing the axial force.

[0043] In the present invention, the outer part of the loose tube 2 is provided with a spiral groove 201 distributed in the axial direction, the cross-sectional shape of the spiral groove 201 is specifically square or semicircular, a copper wire bundle 202 is wound in the spiral groove 201, the spiral track of the spiral groove 201 substantially overlaps with the spiral track of the copper wire bundle 202, and most of the copper wire bundle 202 is placed in the spiral groove 201. The loose tube 2 with the spiral groove 201 has a relatively small remaining length and strong heat tensile resistance, and after the copper wire bundle 202 is positioned, the heat tensile resistance of the loose tube can be further improved; in addition, the copper wire bundle 202 has a conductive and heat-conductive effect, has a shielding effect, and can quickly conduct local heat at the same time, avoiding the risk of burning or even burning caused by excessive local heat.

[0044] In the present invention, the outer surface of the fiber core 101 is a smooth dust-free surface, the surface of the fiber core 101 is polished and soot-blown, the cladding 102 is specifically made of silicone rubber, the coating layer 103 is specifically made of silver conductive paint, and the insulating skin 104 is specifically made of nitrile rubber. The coating layer 103, like the copper wire bundle 202, plays a role in conducting electricity and heat, has a shielding effect, and can quickly conduct local heat to avoid the risk of burning or even burning caused by excessive local heat.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A central tube type anti-bite and high temperature resistant optical cable, comprising a cable core (1), a loose tube (2) wrapped outside the cable core (1), a water blocking tape (3) wrapped outside the loose tube (2), a glass fiber armor layer (4) wrapped outside the water blocking tape (3), a fire-resistant composite tape (5) wrapped outside the glass fiber armor layer (4), and a ceramic composite layer (6) extruded outside the fire-resistant composite tape (5), characterized in that: The cable core (1) is composed of a plurality of single-core optical fibers, each of which comprises, from the inside to the outside, a core (101), a cladding (102), a coating layer (103), and an insulating skin (104); The glass fiber armor layer (4) is specifically composed of annularly distributed glass fiber plastic rods twisted on the outer surface of the loose tube (2); The ceramic composite layer (6) is embedded with an annularly distributed reinforcing core (7), wherein the reinforcing core (7) is formed by twisting two fiber-reinforced composite wires; The glass fiber plastic rods in the glass fiber armor layer (4) are specifically twisted by cage twisting; The water-blocking tape (3) is specifically a highly water-absorbent compound. The preparation method of the highly water-absorbent compound is as follows: lightly cross-linked sodium polyacrylate, sodium polybenzene sulfonate, nylon 6 and nylon 46 are mixed in a weight ratio of 1:0.5:0.3:0.2, added into a mixer, mixed at 80-120° C. for 2 h, irradiated with cobalt 60 gamma rays under stirring for 30 min, taken out and melt-extruded, spun, and woven into a thin tape with a width of 1-1.5 cm and a thickness of 0.1-0.13 mm, thereby obtaining a finished water-blocking tape; The loose tube (2) is provided with a spiral groove (201) distributed along the axial direction on the outside, the cross-sectional shape of the spiral groove (201) is specifically square or semicircular, a copper wire bundle (202) is wound inside the spiral groove (201), the spiral trajectory of the spiral groove (201) is substantially coincident with the spiral trajectory of the copper wire bundle (202), and most of the copper wire bundle (202) is placed inside the spiral groove (201).

2. The central tube type anti-bite and high temperature resistant optical cable according to claim 1, characterized in that: The ceramic composite layer (6) is made of silicone rubber, which contains 2% glass fiber, 3% mica and 2.5% activated carbon. The preparation method is as follows: 1) Mix at 100-120°C for 1-2h; 2) Under oxygen-free and water-free conditions and under a pressure of 1-2 MPa, the rubber material required for the ceramic composite layer (6) is rapidly melted at 280-300°C and extruded into granules.

3. The central tube type anti-bite and high temperature resistant optical cable according to claim 1, characterized in that: The fiber-reinforced composite wire specifically refers to any one of glass fiber, carbon fiber, boron fiber, aramid fiber, aluminum oxide fiber or silicon carbide fiber; the reinforcing core (7) is subjected to an immersion treatment, and the immersion treatment comprises the following steps: 1) The twisted reinforcing core (7) is placed in an aqueous solution containing 1% strychnine, 1.5% capsaicin and 2.2% onion extract dissolved therein at a weight concentration, and soaked for 1-2 hours; 2) Dry the reinforcing core (7) with hot air at 60°C, distribute the reinforcing core (7) carrying powder in a ring shape around the refractory composite belt (5), and allow a gap between the reinforcing core (7) and the refractory composite belt (5), and extrude the rubber material filling the ceramic composite layer (6) onto the outer surface of the refractory composite belt (5) to finally form the refractory composite belt.

4. The central tube type anti-bite and high temperature resistant optical cable according to claim 1, characterized in that: The fire-resistant composite tape (5) is specifically a RUB-SIL (CCT) type ceramic fire-resistant composite tape, and the fire-resistant composite tape (5) is wrapped around or longitudinally wrapped on the outer surface of the glass fiber armor layer (4).

5. The central tube type anti-bite and high temperature resistant optical cable according to claim 1, characterized in that: The outer surface of the fiber core (101) is a smooth dust-free surface, the surface of the fiber core (101) is polished and soot-blown, the cladding (102) is specifically made of silicone rubber, the coating layer (103) is specifically made of silver conductive paint, and the insulating skin (104) is specifically made of nitrile rubber.

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