Shockproof optical cable and preparation method thereof

Abstract

The invention relates to the technical field of communication optical cables for high-end equipment manufacturing, and particularly discloses a shockproof optical cable and a preparation method thereof. The shockproof optical cable comprises an optical fiber unit with a coating layer outside, and a fiber twisting inner layer, a fiber weaving inner layer, a fiber twisting middle layer, a fiber weaving middle layer, a fiber twisting outer layer, a fiber weaving outer layer and an extruded sheath layer are sequentially arranged outside the optical fiber unit from inside to outside. According to the invention, the intertwisted layers and the braid layers which are formed by the fiber strands and are arranged alternately form excellent technical effects of softness, tensile strength and shock absorption and isolation for the internal optical fiber unit, so that the formed optical cable has the technical characteristics of compact structure, light weight, softness, tensile strength, shock isolation and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of communication optical cables for high-end equipment manufacturing, and in particular to a shockproof optical cable and a method for preparing the shockproof optical cable. Background Art

[0002] Common communication optical cables are mainly composed of an internal optical fiber unit, a casing wrapped outside the optical fiber unit, a protective layer outside the casing, and a sheath layer outside the protective layer. Among them, the gap between the optical fiber unit in the casing is filled with fiber paste. According to different usage scenarios, communication optical cables are divided into indoor communication optical cables and outdoor communication optical cables. The technical requirements for the resistance of indoor communication optical cables to working conditions are relatively low, and they are usually required to have a certain tensile strength, so the protective layer outside the casing is usually composed of longitudinal fiber yarn and / or wrapping tape; the technical requirements for the resistance of outdoor communication optical cables to working conditions are relatively high, and they are usually required to have a certain impact resistance and environmental resistance, so the protective layer outside the casing is usually composed of a steel wire twisted layer and / or an aluminum-plastic composite tape wrapping layer. However, whether it is a common indoor communication optical cable or a common outdoor communication optical cable, its seismic resistance is not good. In a vibration working environment such as vehicles and aircraft, there are obvious optical signal discontinuities and optical fiber unit breakages. Therefore, optical cables in vibration working environments should have seismic resistance.

[0003] The various types of shockproof optical cables currently disclosed are technical improvements based on conventional outdoor communication optical cables, such as the Chinese patent document named "A shockproof optical cable", the publication number is CN 107589503 A, and the publication date is January 16, 2018, and the name is "locomotive optical cable and molding process of locomotive optical cable", the publication number is CN117031661A, and the publication date is November 10, 2023. The technical logic of this type of technology is how to improve the impact resistance of the protective layer and / or sheath layer of the optical cable, and use these high structural strength protective layers and / or sheath layers to resist the vibration impact of the working environment, thereby protecting the internal optical fiber unit.

[0004] However, these so-called "seismic" anti-vibration optical cables ignore the resonant vibration characteristics brought by the hard structure. They seem to have excellent anti-vibration characteristics, but in fact, the high structural strength protective layer and / or sheath layer vibrates in the vibrating working environment, causing the internal optical fiber unit to bear the vibration impact, affecting the stability of optical signal transmission and the stability of the optical fiber unit's own structure. It is necessary to form a complex structure of protective layer and / or sheath layer with high structural strength to cushion the shock - such as the technology of publication number CN107589503 A. In addition, the high structural strength protective layer and / or sheath layer will inevitably bring about technical problems such as poor flexibility of the optical cable, larger outer diameter, and heavier weight per unit length, which is not conducive to flexible and clever laying in working environments such as vehicles and aircraft where the space is already narrow. Summary of the invention

[0005] The technical purpose of the present invention is to provide a shockproof optical cable with a compact structure, light weight, softness, tensile strength and seismic isolation, and a method for preparing the shockproof optical cable in view of the particularity of the above-mentioned communication optical cables and the vibration working environment of vehicles, aircraft, etc., as well as the shortcomings of the prior art.

[0006] The technical purpose of the present invention is achieved by the following technical solution: a shockproof optical cable, comprising an optical fiber unit having a coating layer on the outside; The outside of the optical fiber unit is arranged in sequence from inside to outside with a fiber twisted inner layer, a fiber braided inner layer, a fiber twisted middle layer, a fiber braided middle layer, a fiber twisted outer layer, a fiber braided outer layer and an extruded sheath layer.

[0007] Furthermore, the optical fiber unit is a single-mode optical fiber or a multi-mode optical fiber.

[0008] Furthermore, the fiber twisted inner layer is a spirally twisted structure of multiple aramid fiber strands outside the optical fiber unit, and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0009] Furthermore, the fiber braided inner layer is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted inner layer, and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0010] Furthermore, the fiber twisted middle layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided inner layer, and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0011] Furthermore, the fiber braided middle layer is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted middle layer, and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0012] Furthermore, the fiber twisted outer layer is a spirally twisted structure of multiple aramid fiber strands outside the fiber braided middle layer, and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0013] Furthermore, the fiber braided outer layer is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted outer layer, and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

[0014] Furthermore, the extruded sheath layer is an extruded structure of a thermoplastic elastomer material outside the fiber braided outer layer, and the extruded thickness is 0.8 mm to 1.0 mm.

[0015] A method for preparing the above-mentioned shock-proof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating from the active pay-off drum of the cabling machine and pass it through the central hole of the stranding cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation work in step 1, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed on the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; A plurality of aramid fiber strands are loaded onto a pay-off column of a braiding machine, and each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the outer periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation in step 11, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, and adjust the extruder to dry the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. Set the operating parameters of the extruder and start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; Count the length of finished optical cables by using a meter counter; The finished optical cable is taken up through the take-up reel.

[0016] The beneficial technical effects of the present invention are as follows: the above technical measures are aimed at the particularity of the vibration working conditions of the above communication optical cables and vehicles, aircrafts, etc., and a twisted layer and a braided layer composed of three layers of fiber strands are alternately formed on the outside of the optical fiber unit, and the flexible matching gaps between the fiber filaments constituting the fiber strands and the flexible matching gaps between the fiber strands are utilized to form a multi-structure layer of flexible buffering and seismic isolation protection for the internal optical fiber unit, and the seismic effect is excellent; The twisted layer of the fiber strands has excellent repeated bending performance compared to the fiber strands arranged in parallel, so that the optical fiber unit can be reliably protected to have excellent soft bending performance to avoid the optical fiber unit from attenuating more when bent; The braided layer with good shaping effect forms a constrained and compacted shaping effect on the adjacent twisted layer inside, which is conducive to making the structure of the formed optical cable compact, and can effectively prevent the fiber strands of the twisted layer from loosening, so that the twisted layer can achieve excellent tensile effect while satisfying the seismic isolation effect; The sheath layer of the thermoplastic elastomer material has good softness while meeting the technical requirements of environmental resistance.

[0017] Therefore, the optical cable of the above technical measures has an excellent soft, tensile, and seismic isolation protection technical effect for the internal optical fiber unit with alternatingly arranged twisted layers and braided layers composed of fiber strands. The entire molding structure does not adopt a high structural strength protection structure that may cause resonance, hinder soft bending performance, and increase the weight per unit length. The molded optical cable has the technical characteristics of compact structure, light weight, softness, tensile resistance, and seismic isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of the present invention.

[0019] The meaning of the codes in the figure are: 1—optical fiber unit; 2—fiber twisted inner layer; 3—fiber braided inner layer; 4—fiber twisted middle layer; 5—fiber braided middle layer; 6—fiber twisted outer layer; 7—fiber braided outer layer; 8—extruded sheath layer. DETAILED DESCRIPTION

[0020] The present invention relates to the field of communication optical cable technology for high-end equipment manufacturing, specifically a shockproof optical cable and a method for preparing the shockproof optical cable. The main technical solution of the present invention is specifically described below in combination with multiple embodiments. Figure 1 The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0021] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0022] Example 1 See also Figure 1 As shown, the shockproof optical cable of the present invention comprises an optical fiber unit 1 having a coating layer on the outside, and a fiber twisted inner layer 2, a fiber braided inner layer 3, a fiber twisted middle layer 4, a fiber braided middle layer 5, a fiber twisted outer layer 6, a fiber braided outer layer 7 and an extruded sheath layer 8 which are arranged in sequence from the inside to the outside on the outside of the optical fiber unit 1.

[0023] Specifically, the optical fiber unit 1 is a single-mode optical fiber structure.

[0024] The fiber twisted inner layer 2 is a spiral twisted structure of multiple aramid fiber strands outside the optical fiber unit 1, and the twisted pitch-diameter ratio is about 18 times. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0025] The fiber braided inner layer 3 is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted inner layer 2, with a braiding density of about 88%. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber yarns.

[0026] The fiber twisted middle layer 4 is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided inner layer 3, and the twisted pitch-diameter ratio is about 18 times. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0027] The fiber braided middle layer 5 is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted middle layer 4, with a braiding density of about 88%. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber yarns.

[0028] The fiber twisted outer layer 6 is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided middle layer 5, and the twisted pitch-diameter ratio is about 18. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0029] The fiber braided outer layer 7 is a cross-braided structure of multiple aramid fiber strands outside the fiber twisted outer layer 6, with a braiding density of about 88%. Each aramid fiber strand is composed of 200D aramid fiber yarn.

[0030] The extruded sheath layer 8 is a thermoplastic elastomer material (ie, TPV material) extruded outside the fiber braided outer layer 7, and the extruded thickness is about 0.9 mm.

[0031] The method for preparing the shockproof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating layer that meets the design requirements from the active pay-off drum of the cabling machine and pass it through the central hole of the cabling machine cage; A plurality of (e.g., 10) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation operation in step 1, set the operating parameters of the cable machine to a stranding speed of 20 m / min and a stranding pitch corresponding to 18 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed against the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine to a braiding speed of 150 mm / min and a braiding pitch corresponding to a braiding density conversion of 88%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 15) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine to a stranding speed of 25 m / min and a stranding pitch corresponding to 18 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine to a braiding speed of 180 mm / min and a braiding pitch corresponding to a braiding density conversion of 88%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 20) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding thread holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine to a stranding speed of 30 m / min and a stranding pitch corresponding to 18 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 24) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation in step 11, set the operating parameters of the braiding machine to a braiding speed of 280 mm / min and a braiding pitch corresponding to a braiding density conversion of 88%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, adjust the extruder's baking temperature to 80° C. and the baking time to 5 hours, and bake the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. After the thermoplastic elastomer material is baked, set the operating parameters of the extruder to a body temperature of 180°C and a head temperature of 190°C; After the temperature of the body and head reaches the set temperature, start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head according to the designed extrusion thickness to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; It reaches the meter through the traction of the traction wheel; Count the length of finished optical cables by using a meter counter; Reach the take-up reel through the wire storage device; The finished optical cable is taken up through the take-up reel.

[0032] Example 2 The shockproof optical cable of the present invention comprises an optical fiber unit with a coating layer on the outside, and a fiber twisted inner layer, a fiber braided inner layer, a fiber twisted middle layer, a fiber braided middle layer, a fiber twisted outer layer, a fiber braided outer layer and an extruded sheath layer arranged in sequence from the inside to the outside of the optical fiber unit.

[0033] Specifically, the optical fiber unit is a single-mode optical fiber structure.

[0034] The fiber twisted inner layer is a spiral twisted structure of multiple aramid fiber strands outside the optical fiber unit, and the twisted pitch ratio is about 15 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0035] The fiber braided inner layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted inner layer, with a braiding density of about 90%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0036] The fiber twisted middle layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided inner layer, and the twisted pitch ratio is about 15 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0037] The fiber braided middle layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted middle layer, with a braiding density of about 90%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0038] The fiber twisted outer layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided middle layer, and the twisted pitch ratio is about 15 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0039] The fiber braided outer layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted outer layer, with a braiding density of about 90%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0040] The extruded sheath layer is an extruded structure of a thermoplastic elastomer material outside the fiber braided outer layer, and the extruded thickness is about 1.0 mm.

[0041] The method for preparing the shockproof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating layer that meets the design requirements from the active pay-off drum of the cabling machine and pass it through the central hole of the cabling machine cage; A plurality of (e.g., 10) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation operation in step 1, set the operating parameters of the cable machine to a stranding speed of 20 m / min and a stranding pitch corresponding to 15 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed on the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine to a braiding speed of 150 mm / min and a braiding pitch corresponding to a braiding density conversion of 90%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 15) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine to a stranding speed of 25 m / min and a stranding pitch corresponding to 15 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine to a braiding speed of 180 mm / min and a braiding pitch corresponding to a braiding density conversion of 90%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 20) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine to a stranding speed of 30 m / min and a stranding pitch corresponding to 15 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 24) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation of step 11, set the operating parameters of the braiding machine to a braiding speed of 280 mm / min and a braiding pitch corresponding to a braiding density conversion of 90%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, adjust the extruder's baking temperature to 80° C. and the baking time to 5 hours, and bake the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. After the thermoplastic elastomer material is baked, set the operating parameters of the extruder to a body temperature of 180°C and a head temperature of 190°C; After the temperature of the body and head reaches the set temperature, start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head according to the designed extrusion thickness to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; It reaches the meter through the traction of the traction wheel; Count the length of finished optical cables by using a meter counter; Reach the take-up reel through the wire storage device; The finished optical cable is taken up through the take-up reel.

[0042] Example 3 The shockproof optical cable of the present invention comprises an optical fiber unit with a coating layer on the outside, and a fiber twisted inner layer, a fiber braided inner layer, a fiber twisted middle layer, a fiber braided middle layer, a fiber twisted outer layer, a fiber braided outer layer and an extruded sheath layer arranged in sequence from the inside to the outside of the optical fiber unit.

[0043] Specifically, the optical fiber unit is a multi-mode optical fiber structure.

[0044] The fiber twisted inner layer is a spiral twisted structure of multiple aramid fiber strands outside the optical fiber unit, and the twisted pitch-diameter ratio is about 20 times. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0045] The fiber braided inner layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted inner layer, with a braiding density of about 95%. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0046] The fiber twisted middle layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided inner layer, and the twisted pitch ratio is about 20 times. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0047] The fiber braided middle layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted middle layer, with a braiding density of about 95%. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0048] The fiber twisted outer layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided middle layer, and the twisted pitch ratio is about 20 times. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0049] The fiber braided outer layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted outer layer, with a braiding density of about 95%. Each aramid fiber strand is a lightweight structure composed of 200D aramid fiber filaments.

[0050] The extruded sheath layer is an extruded structure of a thermoplastic elastomer material outside the fiber braided outer layer, and the extruded thickness is about 0.8 mm.

[0051] The method for preparing the shockproof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating layer that meets the design requirements from the active pay-off drum of the cabling machine and pass it through the central hole of the cabling machine cage; A plurality of (e.g., 10) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation operation in step 1, set the operating parameters of the cable machine to a stranding speed of 20 m / min and a stranding pitch corresponding to 20 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed on the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine to a braiding speed of 150 mm / min and a braiding pitch corresponding to a braiding density conversion of 95%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 15) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine to a stranding speed of 25 m / min and a stranding pitch corresponding to 20 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine to a braiding speed of 180 mm / min and a braiding pitch corresponding to a braiding density conversion of 95%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 20) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding thread holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine to a stranding speed of 30 m / min and a stranding pitch corresponding to 20 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 24) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation in step 11, set the operating parameters of the braiding machine to a braiding speed of 280 mm / min and a braiding pitch corresponding to a braiding density conversion of 95%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, adjust the extruder's baking temperature to 80° C. and the baking time to 5 hours, and bake the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. After the thermoplastic elastomer material is baked, set the operating parameters of the extruder to a body temperature of 180°C and a head temperature of 190°C; After the temperature of the body and head reaches the set temperature, start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head according to the designed extrusion thickness to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; It reaches the meter through the traction of the traction wheel; Count the length of finished optical cables by using a meter counter; Reach the take-up reel through the wire storage device; The finished optical cable is taken up through the take-up reel.

[0052] Example 4 The shockproof optical cable of the present invention comprises an optical fiber unit with a coating layer on the outside, and a fiber twisted inner layer, a fiber braided inner layer, a fiber twisted middle layer, a fiber braided middle layer, a fiber twisted outer layer, a fiber braided outer layer and an extruded sheath layer arranged in sequence from the inside to the outside of the optical fiber unit.

[0053] Specifically, the optical fiber unit is a single-mode optical fiber structure.

[0054] The fiber twisted inner layer is a spiral twisted structure of multiple aramid fiber strands outside the optical fiber unit, with a twisted pitch ratio of about 17 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0055] The fiber braided inner layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted inner layer, with a braiding density of about 85%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0056] The fiber twisted middle layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided inner layer, with a twisted pitch ratio of about 17 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0057] The fiber braided middle layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted middle layer, with a braiding density of about 85%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0058] The fiber twisted outer layer is a spiral twisted structure of multiple aramid fiber strands outside the fiber braided middle layer, and the twisted pitch ratio is about 17 times. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0059] The fiber braided outer layer is a cross-woven structure of multiple aramid fiber strands outside the fiber twisted outer layer, with a braiding density of about 85%. Each aramid fiber strand is a lightweight structure composed of 400D aramid fiber filaments.

[0060] The extruded sheath layer is an extruded structure of a thermoplastic elastomer material outside the fiber braided outer layer, and the extruded thickness is about 1.0 mm.

[0061] The method for preparing the shockproof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating layer that meets the design requirements from the active pay-off drum of the cabling machine and pass it through the central hole of the cabling machine cage; A plurality of (e.g., 10) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation operation in step 1, set the operating parameters of the cable machine to a stranding speed of 20 m / min and a stranding pitch corresponding to 17 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed against the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine to a braiding speed of 150 mm / min and a braiding pitch corresponding to a braiding density conversion of 85%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 15) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine to a stranding speed of 25 m / min and a stranding pitch corresponding to 17 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 16) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine to a braiding speed of 180 mm / min and a braiding pitch corresponding to a braiding density conversion of 85%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of (e.g., 20) aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding thread holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine to a stranding speed of 30 m / min and a stranding pitch corresponding to 17 times the pitch diameter ratio; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of (e.g., 24) aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation in step 11, set the operating parameters of the braiding machine to a braiding speed of 280 mm / min and a braiding pitch corresponding to a braiding density conversion of 85%; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, adjust the extruder's baking temperature to 80° C. and the baking time to 5 hours, and bake the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. After the thermoplastic elastomer material is baked, set the operating parameters of the extruder to a body temperature of 180°C and a head temperature of 190°C; After the temperature of the body and head reaches the set temperature, start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head according to the designed extrusion thickness to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; It reaches the meter through the traction of the traction wheel; Count the length of finished optical cables by using a meter counter; Reach the take-up reel through the wire storage device; The finished optical cable is taken up through the take-up reel.

[0062] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0063] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the above embodiments may still be modified, or some of the technical features may be replaced by equivalents, for example, the fiber strands may be composed of other fiber filaments with similar properties, etc.; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A shockproof optical cable, comprising an optical fiber unit (1) having a coating layer on the outside; Features: The exterior of the optical fiber unit (1) is arranged in sequence from the inside to the outside with a fiber twisted inner layer (2), a fiber braided inner layer (3), a fiber twisted middle layer (4), a fiber braided middle layer (5), a fiber twisted outer layer (6), a fiber braided outer layer (7), and an extruded sheath layer (8).

2. The shockproof optical cable according to claim 1, characterized in that: The optical fiber unit (1) is a single-mode optical fiber or a multi-mode optical fiber.

3. The shockproof optical cable according to claim 1, characterized in that: The fiber twisted inner layer (2) is a spirally twisted structure of a plurality of aramid fiber strands outside the optical fiber unit (1), and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

4. The shockproof optical cable according to claim 1, characterized in that: The fiber braided inner layer (3) is a cross-braided structure of a plurality of aramid fiber strands outside the fiber twisted inner layer (2), and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

5. The shockproof optical cable according to claim 1, characterized in that: The fiber twisted middle layer (4) is a spirally twisted structure of a plurality of aramid fiber strands outside the fiber braided inner layer (3), and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

6. The shockproof optical cable according to claim 1, characterized in that: The fiber braided middle layer (5) is a cross-braided structure of a plurality of aramid fiber strands outside the fiber twisted middle layer (4), and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

7. The shockproof optical cable according to claim 1, characterized in that: The fiber twisted outer layer (6) is a spirally twisted structure of a plurality of aramid fiber strands outside the fiber braided middle layer (5), and the twisted pitch-diameter ratio is 15 to 20 times; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

8. The shockproof optical cable according to claim 1, characterized in that: The fiber braided outer layer (7) is a cross-braided structure of a plurality of aramid fiber strands outside the fiber twisted outer layer (6), and the braiding density is ≥85%; Each aramid fiber strand is composed of 200D or 400D aramid fiber filaments.

9. The shockproof optical cable according to claim 1, characterized in that: The extruded sheath layer (8) is a structure in which a thermoplastic elastomer material is extruded outside the fiber braided outer layer (7), and the extruded thickness is 0.8 mm to 1.0 mm.

10. A method for preparing the shockproof optical cable according to any one of claims 1 to 9, characterized in that: The method for preparing the shockproof optical cable comprises the following process steps: Step 1. Pay out the optical fiber unit with coating from the active pay-off drum of the cabling machine and pass it through the central hole of the stranding cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through corresponding wire holes evenly distributed around the stranding cage and evenly arranged around the periphery of the optical fiber unit; The optical fiber unit together with the peripheral aramid fiber strands pass through the stranding die at the front end of the stranding cage of the cabling machine, are wound around the traction wheel, and are pulled out from the traction wheel and fixed on the take-up drum; Step 2. After completing the cable installation work in step 1, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the periphery of the optical fiber unit are evenly and tightly twisted spirally on the outside of the optical fiber unit to form a fiber twisting inner layer; The fiber stranding inner layer is pressed against the outside of the optical fiber unit by the stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted inner layer is collected on the take-up drum by the traction wheel; Step 3. Release the semi-finished product with the fiber twisted inner layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the outer periphery of the fiber twisted inner layer; The semi-finished product with the fiber twisted inner layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 4. After completing the wire assembly operation in step 3, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted inner layer in a cross-weaving manner to form a fiber braided inner layer; The inner layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided inner layer is collected on the take-up drum through the traction wheel; Step 5. Pay out the semi-finished product with the fiber braided inner layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided inner layer; The semi-finished product with the fiber braided inner layer and the aramid fiber strands on the outer periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 6. After completing the cable installation operation in step 5, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided inner layer are evenly and tightly spirally twisted on the outside of the fiber braided inner layer to form a fiber twisted middle layer; The fiber stranding middle layer is pressed against the outside of the fiber braiding inner layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted middle layer is collected on the take-up drum through the traction wheel; Step 7. Release the semi-finished product with the fiber twisted middle layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted middle layer; The semi-finished product with the fiber twisted middle layer and the aramid fiber strands on the periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 8. After completing the wire assembly operation in step 7, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted middle layer in a cross-weaving manner to form a fiber braided middle layer; The fiber braided middle layer is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided middle layer is collected on the take-up drum through the traction wheel; Step 9. Pay out the semi-finished product with the fiber braided middle layer from the active pay-off drum of the cabling machine and pass it through the center hole of the cage of the cabling machine; A plurality of aramid fiber strands are loaded onto a pay-off frame in a stranding cage of a cabling machine, and each aramid fiber strand is installed in the stranding cage in a uniform and symmetrical distribution; Each aramid fiber strand is released through the corresponding wire holes evenly distributed around the twisting cage and evenly arranged on the outer periphery of the fiber braided middle layer; The semi-finished product with the fiber braided middle layer and the aramid fiber strands on the periphery are passed through the stranding die at the front end of the stranding cage of the cabling machine, wound around the traction wheel, and fixed on the take-up drum after being pulled out from the traction wheel; Step 10. After completing the cable installation operation in step 9, set the operating parameters of the cable machine; Start the cabling machine; Through the rotation of the twisting cage, the aramid fiber strands on the outer periphery of the fiber braided middle layer are evenly and tightly spirally twisted on the outside of the fiber braided middle layer to form a fiber twisted outer layer; The fiber stranding outer layer is pressed against the outside of the fiber braiding middle layer by a stranding die at the front end of the cabling machine; The semi-finished product with the fiber twisted outer layer is collected on the take-up drum by the traction wheel; Step 11. Release the semi-finished product with the fiber twisted outer layer from the pay-off frame of the braiding machine and insert it into the center hole of the braiding machine; Loading a plurality of aramid fiber strands onto a pay-off column of a braiding machine, each aramid fiber strand passes through a corresponding threading hole of the pay-off column and is evenly arranged on the periphery of the fiber twisted outer layer; The semi-finished product with the fiber twisted outer layer and the aramid fiber strands on the outer periphery are passed through the wire passing die at the upper end of the braiding machine, connected to the traction wire, and then pulled to the take-up drum through the traction wheel; Step 12. After completing the wire assembly operation in step 11, set the operating parameters of the braiding machine; Turn on the knitting machine; A plurality of aramid fiber strands are evenly and tightly woven on the outside of the fiber twisted outer layer in a cross-weaving manner to form a fiber braided outer layer; The outer layer of the fiber braid is compressed by the wire passing die at the upper end of the braiding machine; The semi-finished product with the fiber braided outer layer is collected on the take-up drum through the traction wheel; Step 13. Load the thermoplastic elastomer material into the hopper of the extruder, and adjust the extruder to dry the material; The semi-finished product with the fiber braided outer layer is mounted on the pay-off frame of the extruder, and the thread end of the semi-finished product is passed through the extrusion die of the extruder and connected to the traction line. The semi-finished product is then passed through the hot water tank, the cold water tank, the drying device, the diameter gauge, the traction wheel, the meter counter, and the wire storage device through the traction line, and finally fixed on the take-up reel of the extruder; Step 14. Set the operating parameters of the extruder and start the extruder; The hot-melt thermoplastic elastomer material is extruded onto the outside of the fiber braided outer layer through an extrusion die on the machine head to form an extruded sheath layer; The extruded jacket layer is shaped by a hot water tank and a cold water tank; The moisture attached to the surface of the extruded sheath layer is blown dry by a blow drying device; The outer diameter parameters of the extruded sheath layer are measured by a diameter gauge to monitor the outer diameter value of the finished optical cable; Count the length of finished optical cables by using a meter counter; The finished optical cable is taken up through the take-up reel.

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