Composite armored optical cable and preparation device and method thereof

Abstract

The invention relates to the technical field of optical cable preparation, in particular to a composite armored optical cable and a preparation device and method thereof. The stainless steel tube sleeves the periphery of the central optical fiber and is filled with fiber paste; the adhesion layer wraps the periphery of the stainless steel pipe; the periphery of the adhesion layer is coated with the fiber reinforced composite material layer; and the protection sleeve is arranged on the periphery of the fiber reinforced composite material layer in a sleeving manner. The composite armored optical cable is good in lateral bending resistance, continuous production can be achieved, and light weight, high strength, corrosion resistance and continuous production can be considered.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cable preparation, and in particular to a composite armored optical cable and a preparation device and method thereof. Background Art

[0002] With the rapid development of 5G communications, ocean observation and smart grids, optical fiber cables need to maintain long-term reliability under complex mechanical stresses (such as lateral pressure, impact) and harsh environments (high salt spray, strong electromagnetic interference). However, traditional optical fiber cables have the following problems: First, they have weak lateral pressure resistance and cannot withstand rock squeezing or deep-sea high pressure, and have a high failure rate in direct burial scenarios; second, it is difficult to balance "lightweight-high strength-corrosion resistance-continuous production" and cannot meet the continuous production needs of highly reliable and lightweight optical cables.

[0003] Therefore, how to improve the lateral pressure resistance of optical cables and realize the continuous production of highly reliable and lightweight optical cables has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0004] The present invention provides a composite armored optical cable and a preparation device and method thereof, which are used to solve the technical problems that need to be urgently solved by those skilled in the art on how to improve the lateral pressure resistance of the optical cable and realize the continuous production of highly reliable and lightweight optical cables.

[0005] In a first aspect, the present invention provides a composite armored optical cable, comprising: Central fiber; A stainless steel tube, which is sleeved on the outer circumference of the central optical fiber and filled with fiber paste; An adhesive layer covering the outer circumference of the stainless steel tube; A fiber-reinforced composite material layer covering the periphery of the adhesive layer; The protective sleeve is sleeved on the outer periphery of the fiber reinforced composite material layer.

[0006] In some embodiments, the fiber-reinforced composite material layer is composited with glass fiber, carbon fiber and a resin matrix.

[0007] In a second aspect, the present invention further provides a method for preparing a composite armored optical cable, comprising the following steps: Step 1: Use a stainless steel belt to cover the central optical fiber, inject fiber paste, and then weld the stainless steel belt into a stainless steel tube to obtain the fifth prefabricated cable core; Step 2: Cleaning the outer surface of the fifth prefabricated cable core, spraying a coupling agent, and drying to obtain an eighth prefabricated cable core; Step 3: Wrapping the glass fiber and the carbon fiber on the outer periphery of the eighth prefabricated cable core, and then immersing it in a resin matrix, and performing molding, curing, and cooling to obtain a thirteenth prefabricated cable core; Step 4: Covering the outer periphery of the thirteenth prefabricated cable core with a protective sheath to obtain the composite armored optical cable.

[0008] In some embodiments, step one comprises: S1: stainless steel tube coil wrapped with stainless steel belt; S2: Use a straightening guide rail to straighten the stainless steel strip along the axial direction to obtain a straight steel strip; S3: using a steel strip shaping die to curl the straight steel strip radially into an arc-shaped receiving groove to obtain an arc-shaped steel strip; S4: using a guide wheel to guide the central optical fiber into the receiving groove of the arc-shaped steel belt to obtain a first prefabricated cable core; S5: injecting fiber paste into the first prefabricated cable core using a fiber paste injector to obtain a second prefabricated cable core; S6: using a sizing die to butt the two sides of the steel strip in the second prefabricated cable core forming process, and curling it into a steel tube with the same outer diameter to obtain a third prefabricated cable core; S7: using a laser welding machine to weld the butt joints of the steel strips in the third prefabricated cable core to obtain a fourth prefabricated cable core; S8: using a steel tube straightening machine to axially straighten the fourth prefabricated cable core to obtain a fifth prefabricated cable core.

[0009] In some embodiments, step two includes: (1) Cleaning the surface of the fifth prefabricated cable core with a plasma cleaning machine to obtain a sixth prefabricated cable core; (2) using a coupling agent sprayer to evenly spray a coupling agent on the outer periphery of the sixth prefabricated cable core to obtain a seventh prefabricated cable core; (3) Drying the surface of the seventh prefabricated cable core with an infrared dryer to obtain an eighth prefabricated cable core.

[0010] In some embodiments, step three includes: Step 1: using a conveyor to transport the eighth prefabricated cable core to a fiber pay-off frame, and using the fiber pay-off frame to wind carbon fiber and glass fiber around the outer periphery of the eighth prefabricated cable core to obtain a ninth prefabricated cable core; Step 2: using a resin dipping tank to immerse the ninth prefabricated cable core into a resin matrix to obtain a tenth prefabricated cable core; Step 3: using a pultrusion die to extrude the tenth prefabricated cable core into a round shape to obtain an eleventh prefabricated cable core; Step 4: using a curing furnace to heat and cure the eleventh prefabricated cable core to obtain a twelfth prefabricated cable core; Step 5: Cool the twelfth prefabricated cable core using a cooling water trough to obtain a thirteenth prefabricated cable core.

[0011] In some embodiments, step four includes: The outer periphery of the thirteenth prefabricated cable core is covered with a protective sheath to obtain a composite armored optical cable.

[0012] In a third aspect, the present invention further provides a device for preparing a composite armored optical cable, using the above-mentioned method for preparing a composite armored optical cable, the preparation device comprising: A steel tube covering assembly is used to cover the central optical fiber with a stainless steel strip, inject fiber paste, and then weld the stainless steel strip into a stainless steel tube to obtain a fifth prefabricated cable core; A steel pipe surface treatment component is used to clean, spray a coupling agent on, and dry the outer surface of the fifth prefabricated cable core to obtain an eighth prefabricated cable core; A composite material coating assembly is used to coat the outer periphery of the eighth prefabricated cable core with glass fiber and carbon fiber, and then immerse the glass fiber and carbon fiber into a resin matrix, and then form, solidify and cool the prefabricated cable core to obtain a thirteenth prefabricated cable core; The sheathing component is used to sheath the outer periphery of the eighth prefabricated cable core with a protective sheath to obtain the composite armored optical cable.

[0013] In some embodiments, the steel pipe covering assembly includes: Stainless steel pipe coil, straightening guide rail, steel belt shaping mold, guide wheel, fiber paste injector, sizing mold, laser welding machine, steel pipe straightening machine.

[0014] In some embodiments, the steel pipe surface treatment assembly includes: Plasma cleaning machine, coupling agent spraying machine, infrared drying machine; The composite material covering component comprises: a conveyor, a fiber yarn rack, a resin dipping tank, a pultrusion die, a curing furnace, and a cooling water tank.

[0015] The beneficial effects of the present invention are as follows: 1. The composite armored optical cable provided by the present invention is formed by sleeved fiber reinforced composite material layer on the outer circumference of the stainless steel tube, and coated with an adhesive layer between the stainless steel tube and the fiber reinforced composite material layer. On the one hand, there is a good bonding and cooperative working mechanism between the stainless steel tube and the fiber reinforced composite material layer. When the composite optical cable is subjected to external force, the stainless steel tube and the fiber reinforced composite material layer will deform together. Due to the different elastic modulus and strength of the two, they will share different proportions of stress according to their own mechanical properties. The stainless steel tube transfers part of the stress to the fiber reinforced composite material layer through the interaction with the fiber reinforced composite material layer, and also obtains a reaction force from the fiber reinforced composite material layer, so that the stress is more widely dispersed between the two materials, further improving the stress dispersion ability and anti-destruction performance of the composite structure, and then improving the lateral bending resistance of the composite optical cable; on the other hand, the adhesion between the stainless steel tube and the fiber reinforced composite material layer is improved by the adhesive layer, which promotes the stress transfer and dispersion process between the stainless steel tube and the fiber reinforced composite material layer, and further improves the lateral bending resistance of the composite optical cable; 2. The preparation method of the composite armored optical cable provided by the present invention has the advantages of light weight, high strength, excellent electromagnetic shielding performance, high reliability, and can realize continuous production. It can take into account "lightweight-high strength-corrosion resistance-continuous production" and meet the continuous production needs of high-reliability and lightweight optical cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a composite armored optical cable of the present invention; Figure 2 It is a schematic diagram of a steel tube coating component and a steel tube surface treatment component in a preparation device for a composite armored optical cable of the present invention; Figure 3 It is a structural schematic diagram of a steel pipe surface treatment component in a preparation device for a composite armored optical cable of the present invention.

[0017] In the attached drawings, 1. central optical fiber; 2. stainless steel tube; 3. fiber paste; 4. adhesive layer; 5. fiber reinforced composite material layer; 6. protective cover; 7. stainless steel tube reel; 8. straightening guide rail; 9. shaping mold; 10. guide wheel; 11. fiber paste injector; 12. sizing mold; 13. laser welding machine; 14. steel pipe straightening machine; 15. plasma cleaning machine; 16. coupling agent sprayer; 17. infrared dryer; 18. conveyor; 19. fiber yarn rack; 20. resin dipping tank; 21. pultrusion mold; 22. curing furnace; 23. cooling water tank. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] As described in the background technology, traditional optical fiber cables have the following problems: First, they have weak lateral pressure resistance and cannot withstand rock squeezing or deep-sea high pressure, and have a high failure rate in direct burial scenarios; second, it is difficult to balance "lightweight-high strength-corrosion resistance-continuous production", and cannot meet the continuous production requirements of highly reliable and lightweight optical cables. Therefore, how to improve the lateral pressure resistance of optical cables and realize the continuous production of highly reliable and lightweight optical cables has become a technical problem that technicians in this field need to solve urgently.

[0020] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 In the first aspect, the present invention provides a composite armored optical cable, comprising: a central optical fiber 1, a stainless steel tube 2, an adhesive layer 4, a fiber-reinforced composite material layer 5 and a protective sleeve 6, wherein the stainless steel tube 2 is sleeved on the outer periphery of the central optical fiber 1, and the interior of the stainless steel tube 2 is filled with fiber paste 3; the adhesive layer 4 covers the outer periphery of the stainless steel tube 2; the fiber-reinforced composite material layer 5 covers the outer periphery of the adhesive layer 4; and the protective sleeve 6 is sleeved on the outer periphery of the fiber-reinforced composite material layer 5. Preferably, the fiber-reinforced composite material layer 5 is composited with glass fiber, carbon fiber and resin matrix.

[0021] The composite armored optical cable of the present invention constitutes a gradient composite structure: the inner layer is a laser-welded sealed 316L stainless steel tube (thickness 0.1-0.2 mm, fiber paste filling amount 85%-95%), the outer layer of the steel tube is a silane coupling agent adhesion layer coated after plasma activation (thickness 5-20 μm, interface shear strength ≥15 MPa), the middle layer is a high-strength glass fiber / carbon fiber mixed FRP layer (volume content ≥60%), and the outer layer is a polyethylene protective sheath 6, forming a metal / non-metal synergistic reinforcement system.

[0022] The composite armored optical cable provided by the present invention is provided with a fiber reinforced composite material layer 5 on the outer periphery of the stainless steel tube 2, and an adhesive layer 4 is applied between the stainless steel tube 2 and the fiber reinforced composite material layer 5. On the one hand, the adhesive layer 4 improves the adhesion and reliability between the stainless steel tube 2 and the fiber reinforced composite material layer 5, and avoids the relative sliding of the stainless steel tube 2 and the fiber reinforced composite material layer 5 during the lateral force and bending and torsion process; on the other hand, there is a good bonding and cooperative working mechanism between the stainless steel tube 2 and the fiber reinforced composite material layer 5. When the composite optical cable is subjected to external force, the stainless steel tube 2 and the fiber reinforced composite material layer 5 will deform together. Due to the different elastic modulus and strength of the two, they will share different proportions of stress according to their own mechanical properties. The stainless steel tube 2 transmits part of the stress to the fiber reinforced composite material layer 5 through the interaction with the fiber reinforced composite material layer 5, and also obtains a reaction force from the fiber reinforced composite material layer 5, so that the stress is more widely dispersed between the two materials, further improving the stress dispersion ability and anti-destruction performance of the composite structure, and thus improving the anti-lateral bending performance of the composite optical cable.

[0023] In a second aspect, the present invention further provides a method for preparing a composite armored optical cable, comprising the following steps: Step 1: Use a stainless steel belt to cover the central optical fiber 1, inject fiber paste 3, and then weld the stainless steel belt into a stainless steel tube 2 to obtain the fifth prefabricated cable core; Step 2: Cleaning the outer surface of the fifth prefabricated cable core, spraying a coupling agent, and drying to obtain an eighth prefabricated cable core; Step 3: Wrapping the glass fiber and the carbon fiber on the outer periphery of the eighth prefabricated cable core, and then immersing it in a resin matrix, and performing molding, curing, and cooling to obtain a thirteenth prefabricated cable core; Step 4: Cover the outer periphery of the thirteenth prefabricated cable core with a protective sheath 6 to obtain the composite armored optical cable.

[0024] In some embodiments, the method for preparing the composite armored optical cable comprises the following steps: S1: stainless steel tube coil wrapped with stainless steel belt; S2: Use the straightening guide rail 8 to straighten the stainless steel strip along the axial direction to obtain a straight steel strip; S3: using a steel strip shaping die 9 to curl the straight steel strip radially into an arc-shaped receiving groove to obtain an arc-shaped steel strip; S4: using the guide wheel 10 to guide the central optical fiber into the receiving groove of the arc-shaped steel belt to obtain a first prefabricated cable core; S5: injecting fiber paste into the first prefabricated cable core using a fiber paste injector 11 to obtain a second prefabricated cable core; S6: using a sizing die 12 to butt the two sides of the steel strip in the second prefabricated cable core forming process, and curling it into a steel tube with the same outer diameter to obtain a third prefabricated cable core; S7: using a laser welding machine 13 to weld the butt joints of the steel strips in the third prefabricated cable core to obtain a fourth prefabricated cable core; S8: straightening the fourth prefabricated cable core along the axial direction using a steel tube straightening machine 14 to obtain a fifth prefabricated cable core; S9: using a plasma cleaning machine 15 to clean the surface of the fifth prefabricated cable core to obtain a sixth prefabricated cable core; S10: using a coupling agent sprayer 16 to evenly spray a coupling agent on the outer periphery of the sixth prefabricated cable core to obtain a seventh prefabricated cable core; S11: drying the surface of the seventh prefabricated cable core using an infrared dryer 17 to obtain an eighth prefabricated cable core; S12: using the conveyor 18 to transport the eighth prefabricated cable core to the fiber yarn rack 19, and using the fiber yarn rack 19 to wind the carbon fiber and the glass fiber around the outer periphery of the eighth prefabricated cable core to obtain a ninth prefabricated cable core; S13: using a resin dipping tank 20 to immerse the ninth prefabricated cable core into a resin matrix to obtain a tenth prefabricated cable core; S14: using the pultrusion die 21 to extrude the tenth prefabricated cable core into a round shape to obtain an eleventh prefabricated cable core; S15: using the curing furnace 22 to heat and cure the eleventh prefabricated cable core to obtain a twelfth prefabricated cable core; S16: Cooling the twelfth prefabricated cable core using a cooling water tank 23 to obtain a thirteenth prefabricated cable core; S17: Using a traction winder to wind and store the thirteenth prefabricated cable core; S18: Covering the outer periphery of the thirteenth prefabricated cable core with a protective sheath to obtain a composite armored optical cable.

[0025] In some of the embodiments, the optical fiber pay-off machine releases the central optical fiber 1 to the guide wheel 10 at a constant tension, and the guide wheel 10 guides the central optical fiber 1 into the center line of the sizing mold 12; the stainless steel belt is flattened by the straightening guide rail 8 and then conveyed to the sizing mold 12, thereby realizing the synchronous defense line of the central optical fiber 1 and the stainless steel belt.

[0026] In some of the embodiments, a stainless steel strip is wrapped around the central optical fiber 1 in a sizing die 12 to form a U-shaped groove, and the edges are continuously welded into a closed steel tube by a laser welding machine 13; while welding, the fiber paste injector 11 dynamically injects through the tail end of the steel tube, and the injection pressure and welding speed are controlled in linkage, thereby improving the consistency and synchronization of the fiber paste injection and the steel tube welding.

[0027] In some of the embodiments, the size of the welded steel pipe is calibrated by a sizing and straightening device, and the welding parameters are adjusted by feedback from a surface roughness detector.

[0028] In some of the embodiments, the fiber creel 19 releases high-strength glass fiber and carbon fiber, which enter the resin impregnation tank 20 synchronously with the stainless steel pipe; the resin matrix is ​​preferably epoxy resin or vinyl ester, and the resin matrix is ​​kept stable in the resin impregnation tank 20 by a circulation pump.

[0029] In some of the embodiments, the composite body after resin dipping enters the pultrusion die 21, which includes a preheating zone and a high-temperature curing zone. The bubbles are expelled and the fibers are compacted by the die pressure; the curing furnace 22 performs secondary curing on the initially formed fiber-reinforced composite material layer 5 to ensure the cross-linking degree of the resin.

[0030] In some of the embodiments, the traction winder synchronously controls the linear speed of the stainless steel tube 2 and the fiber reinforced composite material layer 5 through a servo motor to avoid interlayer peeling caused by tension fluctuations.

[0031] In some of the embodiments, after welding, the stainless steel pipe enters a plasma cleaning machine 15 to remove surface oxides in an argon environment to generate active -OH groups; a coupling agent sprayer 16 evenly sprays the silane coupling agent onto the outer surface of the steel pipe with a coating thickness of 5-20 μm; an infrared drying oven quickly cures the coupling agent to form a transition layer chemically bonded to the fiber-reinforced composite material layer 5.

[0032] The preparation method of the composite armored optical cable provided by the present invention has the advantages of light weight, high strength, excellent electromagnetic shielding performance, high reliability, and can realize continuous production. It can take into account "lightweight-high strength-corrosion resistance-continuous production" and meet the continuous production requirements of highly reliable and lightweight optical cables.

[0033] In a third aspect, the present invention further provides a device for preparing a composite armored optical cable, using the above-mentioned method for preparing a composite armored optical cable, the preparation device comprising: A steel tube covering assembly is used to cover the central optical fiber 1 with a stainless steel strip, inject fiber paste 3, and then weld the stainless steel strip into a stainless steel tube 2 to obtain a fifth prefabricated cable core; A steel pipe surface treatment component is used to clean, spray a coupling agent on, and dry the outer surface of the fifth prefabricated cable core to obtain an eighth prefabricated cable core; A composite material coating assembly is used to coat the outer periphery of the eighth prefabricated cable core with glass fiber and carbon fiber, and then immerse the glass fiber and carbon fiber into a resin matrix, and then form, solidify and cool the prefabricated cable core to obtain a thirteenth prefabricated cable core; The sheathing component is used to sheath the protective sheath 6 on the outer periphery of the eighth prefabricated cable core to obtain the composite armored optical cable.

[0034] In some of the embodiments, the steel pipe covering assembly includes: a stainless steel pipe disc 7, a straightening guide rail 8, a steel strip shaping mold 9, a guide wheel 10, a fiber paste injector 11, a sizing mold 12, a laser welding machine 13, and a steel pipe straightening machine 14 along the movement direction of the stainless steel belt.

[0035] In some of the embodiments, the steel pipe surface treatment components include: a plasma cleaning machine 15 , a coupling agent spraying machine 16 , and an infrared drying machine 17 .

[0036] The composite material covering assembly includes: a conveyor 18, a fiber yarn rack 19, a resin dipping tank 20, a pultrusion die 21, a curing furnace 22, and a cooling water tank 23.

[0037] The preparation device of the composite armored optical cable provided by the present invention omits the traditional armored twisting equipment and relies on the integrated production line of laser welding + pultrusion, with low equipment investment; based on the high sealing performance of the laser welded steel pipe, the fiber paste overflow loss rate is ≤3%, and the continuous production speed is ≥60m / min, which is 300% more efficient than the segmented process, and the annual production capacity of a single line exceeds 100,000 kilometers.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0042] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A composite armored optical cable, characterized in that: include: Central fiber; A stainless steel tube, which is sleeved on the outer circumference of the central optical fiber and filled with fiber paste; An adhesive layer covering the outer circumference of the stainless steel tube; A fiber-reinforced composite material layer covering the periphery of the adhesive layer; The protective sleeve is sleeved on the outer periphery of the fiber reinforced composite material layer.

2. The composite armored optical cable according to claim 1, characterized in that: The fiber-reinforced composite material layer is composited from glass fiber, carbon fiber and a resin matrix.

3. A method for preparing the composite armored optical cable according to claim 1 or 2, characterized in that: The steps include: Step 1: Use a stainless steel belt to cover the central optical fiber, inject fiber paste, and then weld the stainless steel belt into a stainless steel tube to obtain the fifth prefabricated cable core; Step 2: Cleaning the outer surface of the fifth prefabricated cable core, spraying a coupling agent, and drying to obtain an eighth prefabricated cable core; Step 3: Wrapping the glass fiber and the carbon fiber on the outer periphery of the eighth prefabricated cable core, and then immersing it in a resin matrix, and performing molding, curing, and cooling to obtain a thirteenth prefabricated cable core; Step 4: Covering the outer periphery of the thirteenth prefabricated cable core with a protective sheath to obtain the composite armored optical cable.

4. The method for preparing the composite armored optical cable according to claim 3, characterized in that: The step one comprises: S1: stainless steel tube coil wrapped with stainless steel belt; S2: Use a straightening guide rail to straighten the stainless steel strip along the axial direction to obtain a straight steel strip; S3: using a steel strip shaping die to curl the straight steel strip radially into an arc-shaped receiving groove to obtain an arc-shaped steel strip; S4: using a guide wheel to guide the central optical fiber into the receiving groove of the arc-shaped steel belt to obtain a first prefabricated cable core; S5: injecting fiber paste into the first prefabricated cable core using a fiber paste injector to obtain a second prefabricated cable core; S6: using a sizing die to butt the two sides of the steel strip in the second prefabricated cable core forming process, and curling it into a steel tube with the same outer diameter to obtain a third prefabricated cable core; S7: using a laser welding machine to weld the butt joints of the steel strips in the third prefabricated cable core to obtain a fourth prefabricated cable core; S8: using a steel tube straightening machine to axially straighten the fourth prefabricated cable core to obtain a fifth prefabricated cable core.

5. The method for preparing the composite armored optical cable according to claim 3, characterized in that: The second step comprises: (1) Cleaning the surface of the fifth prefabricated cable core with a plasma cleaning machine to obtain a sixth prefabricated cable core; (2) using a coupling agent sprayer to evenly spray a coupling agent on the outer periphery of the sixth prefabricated cable core to obtain a seventh prefabricated cable core; (3) Drying the surface of the seventh prefabricated cable core with an infrared dryer to obtain an eighth prefabricated cable core.

6. The method for preparing the composite armored optical cable according to claim 3, characterized in that: The step three comprises: Step 1: using a conveyor to transport the eighth prefabricated cable core to a fiber pay-off frame, and using the fiber pay-off frame to wind carbon fiber and glass fiber around the outer periphery of the eighth prefabricated cable core to obtain a ninth prefabricated cable core; Step 2: using a resin dipping tank to immerse the ninth prefabricated cable core into a resin matrix to obtain a tenth prefabricated cable core; Step 3: using a pultrusion die to extrude the tenth prefabricated cable core into a round shape to obtain an eleventh prefabricated cable core; Step 4: using a curing furnace to heat and cure the eleventh prefabricated cable core to obtain a twelfth prefabricated cable core; Step 5: Cool the twelfth prefabricated cable core using a cooling water trough to obtain a thirteenth prefabricated cable core.

7. The method for preparing the composite armored optical cable according to claim 3, characterized in that: The fourth step comprises: The outer periphery of the thirteenth prefabricated cable core is covered with a protective sheath to obtain a composite armored optical cable.

8. A preparation device for a composite armored optical cable, characterized in that: The method for preparing the composite armored optical cable according to any one of claims 3 to 7 is adopted, wherein the preparation device comprises: A steel tube covering assembly is used to cover the central optical fiber with a stainless steel strip, inject fiber paste, and then weld the stainless steel strip into a stainless steel tube to obtain a fifth prefabricated cable core; A steel pipe surface treatment component is used to clean, spray a coupling agent on, and dry the outer surface of the fifth prefabricated cable core to obtain an eighth prefabricated cable core; A composite material coating assembly is used to coat the outer periphery of the eighth prefabricated cable core with glass fiber and carbon fiber, and then immerse the glass fiber and carbon fiber into a resin matrix, and then form, solidify and cool the prefabricated cable core to obtain a thirteenth prefabricated cable core; The sheathing component is used to sheath the outer periphery of the eighth prefabricated cable core with a protective sheath to obtain the composite armored optical cable.

9. The preparation device of the composite armored optical cable according to claim 8, characterized in that: The steel pipe covering assembly includes: Stainless steel pipe coil, straightening guide rail, steel belt shaping mold, guide wheel, fiber paste injector, sizing mold, laser welding machine, steel pipe straightening machine.

10. The preparation device of the composite armored optical cable according to claim 8, characterized in that: The steel pipe surface treatment assembly comprises: Plasma cleaning machine, coupling agent spraying machine, infrared drying machine; The composite material covering component comprises: a conveyor, a fiber yarn rack, a resin dipping tank, a pultrusion die, a curing furnace, and a cooling water tank.

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