Photoelectric hybrid cable and its preparation process

Abstract

The present invention relates to the field of cable technology, in particular to an optoelectronic hybrid cable and a preparation process thereof, comprising an optical fiber unit, a plurality of twisted conductor units are evenly arranged around the optical fiber unit, each of the twisted conductor units and the optical fiber unit is molded by coating with a water-blocking and flame-retardant filling paste layer, a double-sided aluminum-plastic composite tape is wrapped around the outside of the water-blocking and flame-retardant filling paste layer, an inner sheath is coated on the outside of the double-sided aluminum-plastic composite tape, an outer braided layer is coated on the periphery of the inner sheath, an outer sheath is extruded on the periphery of the outer braided layer, and a double-material reinforcing core is also arranged between two adjacent twisted conductor units. The optoelectronic hybrid cable product designed in the present invention places the optical fiber unit in the center in terms of layout, and the twisted conductor units are arranged around it, which can effectively ensure the protection of the optical fiber unit in the center. In addition, the use of multiple evenly distributed double-material reinforcing cores can achieve overall rigid reinforcement while ensuring its toughness.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a photoelectric hybrid cable and a preparation process thereof. Background Art

[0002] The diversity of functions of optoelectronic hybrid low-voltage cables (referred to as optoelectronic composite cables) determines the complexity of the cable structure. They are mainly used in application fields such as long-distance communication power supply systems and short-distance communication system power supply.

[0003] The main structure of the traditional optoelectronic hybrid cable includes power lines, optical fibers and protective structures, etc. However, during the installation and winding of this traditional optoelectronic hybrid low-voltage cable, the internal optical fiber is often easily broken, and the various components of the cable core in the sheath are damaged without visible sight, which seriously affects the subsequent use effect.

[0004] For this reason, in recent years, many units have also improved the structure of traditional optoelectronic hybrid cables. For example, in the patent document with patent publication number CN202307321U, a photoelectric composite cable is disclosed, whose main structure includes a cable and an optical cable; the cable includes a conductor; the optical cable includes an optical fiber, a loose tube, and a tube filler, the loose tube is sleeved outside the optical fiber, and the tube filler is filled between the optical fiber and the loose tube... The optoelectronic composite cable also includes a central reinforcing core, a plastic-coated steel belt, warm water cross-linked polyethylene insulation and a modified polyethylene sheath; the warm water cross-linked polyethylene insulation is covered on the outside of the conductor of the cable, the central reinforcing core is located at the center of the optoelectronic composite cable, the plastic-coated steel belt is covered on the cable, the optical cable, and the outside of the central reinforcing core, and the modified polyethylene sheath is sleeved outside the plastic-coated steel belt.

[0005] It can be seen from the contents disclosed in the above-mentioned prior art that the strength of the wire core is mainly changed by adding a central reinforcing core. However, the overall strength of the composite cable with such a reinforced structure suffers from uneven bending forces during use. At the same time, its overall heat dissipation and flame retardant effects are relatively poor when used under high load conditions.

[0006] To this end, the present invention optimizes and improves the structure and process of the optoelectronic composite cable in view of the problems existing in the prior art, and hereby proposes a new optoelectronic hybrid cable and its preparation process to better solve the problems existing in the prior art. Summary of the invention

[0007] The present invention solves one of the above technical problems, and the technical solution adopted is: an optoelectronic hybrid low-voltage cable, including an optical fiber unit located in the center, a plurality of twisted conductor units are evenly distributed around the optical fiber unit, each of the twisted conductor units and the optical fiber unit is overmolded by a water-blocking and flame-retardant filling paste layer, a double-sided aluminum-plastic composite tape is wrapped around the outside of the water-blocking and flame-retardant filling paste layer, an inner sheath is coated on the outside of the double-sided aluminum-plastic composite tape, an outer braided layer is coated on the periphery of the inner sheath, an outer sheath is extruded on the periphery of the outer braided layer, and a double-material reinforcing core is also arranged between two adjacent twisted conductor units.

[0008] In any of the above schemes, preferably, an aluminum film heat-conducting layer is included between the double-sided aluminum-plastic composite tape and the water-blocking and flame-retardant filling paste layer, the aluminum film heat-conducting layer is wrapped around the outside of the water-blocking and flame-retardant filling paste layer, and the double-sided aluminum-plastic composite tape is wrapped around the outside of the aluminum film heat-conducting layer.

[0009] In any of the above schemes, it is preferred that the optical fiber unit includes a plurality of evenly distributed central optical fibers, each of the central optical fibers is molded by coating with an optical fiber filling layer, an anti-interference braided layer is wrapped on the outer wall of the optical fiber filling layer, a composite shielding sleeve is wrapped on the outside of the anti-interference braided layer, and an optical fiber sheath is coated on the periphery of the composite shielding sleeve.

[0010] In any of the above solutions, preferably, the periphery of each of the central optical fibers is coated with a thin aluminum film layer.

[0011] In any of the above schemes, preferably, the double-material reinforcement core comprises a hollow metal aluminum tube, the central cavity of the hollow metal aluminum tube is filled with polyester rubber, and the periphery of the hollow metal aluminum tube is covered and positioned by the water-blocking and flame-retardant filling paste layer.

[0012] In any of the above schemes, preferably, a steel wire rope twisted armor layer formed by twisting a plurality of steel wire ropes is provided between the inner sheath layer and the outer braided layer.

[0013] In any of the above schemes, it is preferred that the twisted conductor unit includes a twisted bare wire formed by a plurality of thin copper wires, and an insulating flame-retardant heat dissipation sheath is tightly wrapped around the outer periphery of the twisted bare wire, and the outside of each insulating flame-retardant heat dissipation sheath is molded by overmolding the water-blocking and flame-retardant filling paste layer, and a plurality of lateral heat dissipation channels are evenly spaced along the circumference of the insulating flame-retardant heat dissipation sheath, and each of the lateral heat dissipation channels is used to conduct and dissipate the heat absorbed by the insulating flame-retardant heat dissipation sheath and emitted by the twisted bare wire to the outside through the aluminum film thermal conductive layer; the cross-section of each of the lateral heat dissipation channels is a T-shaped structure.

[0014] In any of the above schemes, preferably, the conductor at the center of the stranded bare conductors is formed by drawing a hollow copper tube.

[0015] The present invention also provides a process for preparing a photoelectric hybrid cable, comprising the following steps:

[0016] Prepare the central optical fiber and make the optical fiber unit through multiple steps;

[0017] Synchronously prepare each stranded conductor unit;

[0018] After the optical fiber unit and each twisted conductor unit are prepared, the optical fiber unit and each twisted conductor unit are positioned through the positioning holes on the extruder and the water-blocking and flame-retardant filling paste layer is coated on the optical fiber unit and each twisted conductor unit;

[0019] Tightly wrap the aluminum film heat-conducting layer and ensure the wrapping effect;

[0020] After the aluminum film thermal conductive layer is coated, a sample of appropriate length is cut as a primary sample line, and the signal is passed through the optical fiber unit and each twisted conductor unit is energized in turn. The primary sample line is passed through a spark detector to detect the overall insulation of each twisted conductor unit and record the primary insulation result. Then, the primary sample line is passed through an anti-interference cable tester to detect the overall anti-interference of each twisted conductor unit and record the primary conductive anti-interference result. Finally, the primary sample line is passed through an optical communication comprehensive tester to detect the performance of the optical fiber unit and record the primary signal result. At this point, the primary sample line detection is completed;

[0021] After the first sample line test meets the standard, continue to wrap the double-sided aluminum-plastic composite tape;

[0022] After the double-sided aluminum-plastic composite tape is wrapped, a sample of appropriate length is cut as a secondary sample line, and the secondary sample line is tested according to the above-mentioned primary sample line testing method;

[0023] After the secondary sample line test meets the standards, the inner sheath is extruded on the outer periphery of the double-sided aluminum-plastic composite belt by an extruder and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape of the inner sheath is qualified and the size meets the standards;

[0024] Cover with outer braided layer;

[0025] The outer sheath is extruded on the periphery of the outer braided layer, and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape and size of the outer sheath are qualified, and then it is wound onto a reel to obtain a rolled optoelectronic hybrid cable;

[0026] The rolled photoelectric hybrid cable is energized and immersed in water to detect the terminal insulation of the hybrid cable;

[0027] After the terminal insulation test is completed, it is packaged and waits for shipment.

[0028] In any of the above schemes, preferably, the specific steps of preparing the twisted conductor unit are as follows:

[0029] Straighten and thin the copper tube and copper wire with an outer diameter of 10 mm through a drawing machine to form a thin copper tube central conductor and a thin copper wire, and wind them onto a bobbin respectively;

[0030] The wire drums each wound with a thin copper tube center conductor and thin copper wire are sequentially placed into a cable twisting machine, and the thin copper tube center conductor and each thin copper wire are twisted by the high-speed rotation of the cable twisting machine to form a twisted bare wire; during twisting, the thin copper tube center conductor is located in the center;

[0031] The insulating flame retardant heat dissipation sheath is extruded on the outside of the twisted bare conductor using an extrusion die having the same cross section as the insulating flame retardant heat dissipation sheath and an extruder, and is rapidly solidified and cooled by chilled water to obtain a single twisted conductor unit.

[0032] The preparation method of the double-material reinforcement core is as follows:

[0033] The thick-diameter aluminum tube in a coil is drawn and formed into a hollow metal aluminum tube meeting the size requirements by using a drawing machine;

[0034] The drawn hollow aluminum metal tube passes horizontally through a high-temperature injection channel, and a hole is drilled on the upper surface of the hollow aluminum metal tube at the current position by high-temperature drilling to form an injection hole connected to the central cavity inside the tube;

[0035] High-temperature polyester rubber fluid is injected into the interior along the current injection drilling hole under high pressure to complete the filling of the inner central cavity of the hollow metal aluminum tube within the current length range. After the injection is completed, the current injection drilling hole is sealed with aluminum liquid and cooled to form;

[0036] Repeat the above steps every 5m-10m, and repeat this process to complete the processing of the entire hollow aluminum metal tube;

[0037] The high-temperature injection molding channel that passes out of the high-temperature injection molding channel is cooled and wound into a roll, and finally a double-material reinforcement core is obtained.

[0038] In any of the above schemes, it is preferred that the high temperature inside the high-temperature injection channel heats the hollow metal aluminum tube passing therethrough and serves to delay the solidification rate of the high-temperature polyester rubber fluid entering the central cavity of the hollow metal aluminum tube.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The optoelectronic hybrid cable product designed in the present invention places the optical fiber unit in the center in terms of layout, and arranges twisted conductor units around it to effectively ensure the protection of the optical fiber unit in the center. In addition, multiple evenly distributed double-material reinforcing cores are used to achieve overall rigidity reinforcement while ensuring its toughness, effectively ensuring the control of the bending degree and deformation return force when the product is laid and turned, reducing the risk of the optical fiber being broken, and ensuring the rigidity and toughness of the product.

[0041] 2. Each twisted conductor unit in this product is twisted, and each of the externally-insulated flame-retardant heat-dissipating sheaths is equipped with multiple lateral heat-dissipating channels, thereby ensuring the overall heat dissipation effect of the entire hybrid cable under heavy load conditions. In addition, the aluminum film heat-conducting layer is used in conjunction with the multiple lateral heat-dissipating channels of each insulating flame-retardant heat-dissipating sheath to achieve heat conduction and heat dissipation.

[0042] 3. The steel wire rope twisted armor layer arranged on the outside of the entire optoelectronic hybrid cable is effectively suitable for laying and installation under harsh working conditions, ensuring effective protection of the internal structure while further improving its surface toughness.

[0043] 4. When preparing the optoelectronic hybrid cable, multiple sampling tests are performed to detect insulation, signal effects, and line continuity, which can effectively ensure the good comprehensive performance of the prepared cable product.

[0044] 5. The multiple double-material reinforcement cores provided in the present invention are all formed by a special method of first drawing and then injection cooling to achieve a double-material structure of the double-material reinforcement core that is rigid on the outside and flexible on the inside, which can better ensure rigidity while having a certain degree of flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0046] Figure 1 It is a schematic diagram of the cross-section internal structure of the optoelectronic hybrid cable of the present invention.

[0047] In the figure, 1. Water-blocking and flame-retardant filling paste layer; 2. Double-sided aluminum-plastic composite tape; 3. Inner sheath; 4. External braided layer; 5. Outer sheath; 6. Double-material reinforced core; 601. Hollow metal aluminum tube; 602. Polyester rubber; 7. Aluminum film thermal conductive layer; 8. Central optical fiber; 9. Optical fiber filling layer; 10. Anti-interference braided layer; 11. Composite shielding sleeve; 12. Optical fiber sheath; 13. Thin aluminum film layer; 14. Steel wire rope twisted armor layer; 15. Twisted bare conductor; 1501. Thin copper tube central conductor; 1502. Thin copper wire; 16. Insulated flame-retardant heat dissipation sheath; 17. Lateral heat dissipation channel. DETAILED DESCRIPTION

[0048] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1 as shown in .

[0049] Embodiment 1: A photoelectric hybrid low-voltage cable comprises a fiber unit located in the center, and a plurality of twisted conductor units are evenly arranged around the fiber unit, each of the twisted conductor units and the fiber unit is molded by coating with a water-blocking and flame-retardant filling paste layer 1, a double-sided aluminum-plastic composite tape 2 is wrapped around the outside of the water-blocking and flame-retardant filling paste layer 1, an inner sheath 3 is coated on the outside of the double-sided aluminum-plastic composite tape 2, an outer braided layer 4 is coated on the periphery of the inner sheath 3, an outer sheath 5 is extruded on the periphery of the outer braided layer 4, and a double-material reinforcing core 6 is also arranged between two adjacent twisted conductor units. The photoelectric hybrid low-voltage cable in the present invention utilizes a plurality of twisted conductor units to provide circumferential protection to the fiber unit located in the center, and cooperates with each double-material reinforcing core 6 to achieve circumferential reinforcement protection, so as to achieve the purpose of ensuring the stability of the entire cable structure; the water-blocking and flame-retardant filling paste layer 1 provided here protects the fiber unit, the double-material reinforcing core 6, and the twisted conductor unit, and can better fix them into a unified overall structure, and finally achieve the purpose of strengthening the stability of the internal optical fiber and cable.

[0050] The double-sided aluminum-plastic composite tape 2 can achieve the purpose of waterproofing and shielding interference; at the same time, it cooperates with the inner sheath 3, the outer braided layer 4 and the outer sheath 5 to provide final restraint protection for the outside of the entire cable.

[0051] In any of the above schemes, preferably, an aluminum film heat conductive layer 7 is further included between the double-sided aluminum-plastic composite tape 2 and the water-blocking and flame-retardant filling paste layer 1, and the aluminum film heat conductive layer 7 is wrapped around the outside of the water-blocking and flame-retardant filling paste layer 1, and the double-sided aluminum-plastic composite tape 2 is wrapped around the outside of the aluminum film heat conductive layer 7. The double-sided aluminum-plastic composite tape 2 cooperates with the aluminum film heat conductive layer 7, and the aluminum film heat conductive layer 7 has two functions here: first, it cooperates with each lateral heat dissipation channel 17 to quickly conduct heat and dissipate heat generated by each twisted conductor unit; second, it realizes preliminary shielding of signal interference of the central optical fiber 8 and each twisted conductor unit in the circumferential direction.

[0052] The double-sided aluminum-plastic composite tape 2 has two functions here: first, it cooperates with the aluminum film heat-conducting layer 7 to achieve the purpose of shielding and protection; second, it plays the role of protection and water blocking.

[0053] In any of the above schemes, it is preferred that the optical fiber unit includes a plurality of evenly distributed central optical fibers 8, each of which is molded by being coated with an optical fiber filling layer 9, an anti-interference braided layer 10 is wrapped around the outer wall of the optical fiber filling layer 9, a composite shielding sleeve 11 is wrapped around the outside of the anti-interference braided layer 10, and an optical fiber sheath 12 is coated around the periphery of the composite shielding sleeve 11. The anti-interference braided layer 10 provided here can serve the purpose of anti-signal interference protection, and cooperate with the composite shielding sleeve 11 to further ensure the effectiveness of optical fiber signal transmission.

[0054] In any of the above schemes, preferably, a steel wire rope twisted armor layer 14 formed by twisting a plurality of steel wire ropes is provided between the inner sheath 3 and the outer braided layer 4. The steel wire rope twisted armor layer 14 can be used under relatively harsh laying conditions and effectively ensure the protection of the inside of the cable during laying.

[0055] In any of the above schemes, it is preferred that the twisted conductor unit includes a twisted bare conductor 15 twisted by a plurality of thin copper wires, an insulating flame-retardant heat-dissipating sheath 16 is tightly coated on the outer periphery of the twisted bare conductor 15, the outer portion of each of the insulating flame-retardant heat-dissipating sheaths 16 is molded by the water-blocking flame-retardant filling paste layer 1, and a plurality of lateral heat-dissipating channels 17 are evenly spaced along the circumference of the insulating flame-retardant heat-dissipating sheath 16, each of the lateral heat-dissipating channels 17 is used to conduct and dissipate the heat absorbed by the insulating flame-retardant heat-dissipating sheath 16 and emitted by the twisted bare conductor 15 to the outside through the aluminum film heat-conducting layer 7; the cross-section of each of the lateral heat-dissipating channels 17 is a T-shaped structure. The structure of the twisted bare conductor 15 twisted by a plurality of thin copper wires can reduce the mutual inductance and electromagnetic interference between cables, and can effectively reduce the impact of electromagnetic interference. In addition, the insulating flame-retardant heat dissipation sheath 16 can utilize a plurality of lateral heat dissipation channels 17 to achieve rapid cavity heat dissipation and outward heat conduction while playing a flame-retardant role, thereby effectively improving the heat dissipation and heat conduction effect of the entire twisted conductor unit.

[0056] The present invention also provides a process for preparing a photoelectric hybrid cable, comprising the following steps:

[0057] Prepare the central optical fiber 8 and make the optical fiber unit through multiple steps;

[0058] Synchronously prepare each stranded conductor unit;

[0059] After the optical fiber unit and each twisted conductor unit are prepared, the optical fiber unit and each twisted conductor unit are positioned through the positioning holes on the extruder and the water-blocking and flame-retardant filling paste layer 1 is coated on the optical fiber unit and each twisted conductor unit;

[0060] Tightly wrap the aluminum film heat-conducting layer 7 and ensure the wrapping effect;

[0061] After the aluminum film heat conductive layer 7 is coated, a sample of appropriate length is cut off as a primary sample line, and a signal is sequentially input into the optical fiber unit and each twisted conductor unit is energized. The primary sample line is passed through a spark detector to realize the overall insulation test of each twisted conductor unit and the primary insulation result is recorded. Then, the primary sample line is passed through an anti-interference cable tester to detect the overall anti-interference test of each twisted conductor unit and the primary conductive anti-interference result is recorded. Finally, the primary sample line is passed through an optical communication comprehensive tester to detect the performance of the optical fiber unit and record the primary signal result. Thus, the primary sample line test is completed;

[0062] After the first sample line test meets the standard, continue to wrap the double-sided aluminum-plastic composite tape 2;

[0063] After the double-sided aluminum-plastic composite tape 2 is wrapped, a sample of appropriate length is cut as a secondary sample line, and the secondary sample line is tested according to the above-mentioned primary sample line testing method; the use of primary sample line testing and secondary sample line testing in the process can effectively ensure the effective detection and control of the performance of the cable intermediate in the preparation process, and improve the qualified rate of cable products; at the same time, according to the test results of the primary sample line testing and the secondary sample line testing, it can be effectively judged that the current aluminum film thermal conductive layer 7 and the double-sided aluminum-plastic composite tape 2 meet the interference shielding effect of the entire optical fiber unit and each twisted conductor unit after wrapping, thereby ensuring that the product can achieve the purpose of anti-interference when used.

[0064] After the secondary sample line test is up to standard, the inner sheath 3 is extruded on the periphery of the double-sided aluminum-plastic composite belt 2 by an extruder and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape of the inner sheath 3 is qualified and the size is up to standard;

[0065] Covering the outer braided layer 4;

[0066] An outer sheath 5 is extruded on the periphery of the outer braided layer 4, and a diameter is measured by a high-precision laser measuring instrument to ensure that the shape and size of the outer sheath 5 are qualified, and the outer sheath 5 is wound onto a reel to obtain a rolled optoelectronic hybrid cable;

[0067] The rolled photoelectric hybrid cable is energized and immersed in water to detect the terminal insulation of the hybrid cable;

[0068] The water immersion insulation test can realize the final test of the insulation performance of the entire cable after winding, so as to obtain the insulation performance effect of the current cable product.

[0069] After the terminal insulation test is completed, it is packaged and waits for shipment.

[0070] In any of the above schemes, preferably, the specific steps of preparing the twisted conductor unit are as follows:

[0071] The copper tube and copper wire with an outer diameter of 10 mm are straightened and thinned into a thin copper tube center conductor 1501 and a thin copper wire 1502 through a drawing machine, and then they are respectively wound on a bobbin;

[0072] The wire drums each wound with the thin copper tube center conductor 1501 and the thin copper wire 1502 are sequentially placed into a cable twisting machine, and the thin copper tube center conductor 1501 and each thin copper wire 1502 are twisted by the high-speed rotation of the cable twisting machine to form a twisted bare conductor 15; during twisting, the thin copper tube center conductor 1501 is located at the center;

[0073] The insulating flame retardant heat dissipation sheath 16 is extruded and molded on the outside of the stranded bare conductor 15 by using an extrusion die having the same cross section as the insulating flame retardant heat dissipation sheath 16 and an extruder, and then rapidly solidified and cooled by chilled water to obtain a single stranded conductor unit. The structure of the stranded bare conductor 15 made of a plurality of thin copper wires can reduce the mutual inductance and electromagnetic interference between cables, and can effectively reduce the impact of electromagnetic interference.

[0074] The central conductor adopts a thin copper tube central conductor 1501 with a hollow structure, which can ensure the heat dissipation effect of the thin copper tube central conductor 1501 when in use, while ensuring that its overall flexibility and bendability are improved.

[0075] Embodiment 2: A photoelectric hybrid low-voltage cable comprises an optical fiber unit located in the center, and a plurality of twisted conductor units are evenly distributed around the optical fiber unit, each of the twisted conductor units and the optical fiber unit is overmolded by a water-blocking and flame-retardant filling paste layer 1, a double-sided aluminum-plastic composite tape 2 is wrapped around the outside of the water-blocking and flame-retardant filling paste layer 1, an inner sheath 3 is coated on the outside of the double-sided aluminum-plastic composite tape 2, an outer braided layer 4 is coated on the periphery of the inner sheath 3, an outer sheath 5 is extruded on the periphery of the outer braided layer 4, and a double-material reinforcing core 6 is also arranged between two adjacent twisted conductor units.

[0076] In any of the above schemes, it is preferred that an aluminum film heat-conducting layer 7 is included between the double-sided aluminum-plastic composite tape 2 and the water-blocking and flame-retardant filling paste layer 1, the aluminum film heat-conducting layer 7 is wrapped around the outside of the water-blocking and flame-retardant filling paste layer 1, and the double-sided aluminum-plastic composite tape 2 is wrapped around the outside of the aluminum film heat-conducting layer 7.

[0077] The double-sided aluminum-plastic composite tape 2 cooperates with the aluminum film heat-conducting layer 7, and the aluminum film heat-conducting layer 7 has two functions: first, it cooperates with each lateral heat dissipation channel 17 to quickly conduct heat and dissipate the heat generated by each twisted conductor unit; second, it realizes preliminary shielding of signal interference of the central optical fiber 8 and each twisted conductor unit in the circumferential direction.

[0078] The double-sided aluminum-plastic composite tape 2 has two functions here: first, it cooperates with the aluminum film heat-conducting layer 7 to achieve the purpose of shielding and protection; second, it plays the role of protection and water blocking.

[0079] In any of the above schemes, it is preferred that the optical fiber unit includes a plurality of evenly distributed central optical fibers 8, each of the central optical fibers 8 is overmolded by an optical fiber filling layer 9, an anti-interference braided layer 10 is wrapped on the outer wall of the optical fiber filling layer 9, a composite shielding sleeve 11 is wrapped on the outside of the anti-interference braided layer 10, and an optical fiber sheath 12 is coated on the periphery of the composite shielding sleeve 11.

[0080] The anti-interference braided layer 10 provided here can play the role of anti-signal interference protection, and cooperate with the composite shielding sleeve 11 to further ensure the effectiveness of optical fiber signal transmission.

[0081] In any of the above solutions, it is preferred that a thin aluminum film layer 13 is coated on the periphery of each of the central optical fibers 8 .

[0082] The function of the thin aluminum film layer 13 is to cooperate with the anti-interference braided layer 10 and the composite shielding sleeve 11 to further enhance the anti-interference effect of the optical fiber, so that it can be used in areas where interference signals are more serious.

[0083] In any of the above schemes, preferably, the double-material reinforcing core 6 includes a hollow metal aluminum tube 601, the central cavity of the hollow metal aluminum tube 601 is filled with polyester rubber 602, and the periphery of the hollow metal aluminum tube 601 is covered and positioned by the water-blocking and flame-retardant filling paste layer 1.

[0084] The hollow metal aluminum tube 601 and the polyester rubber 602 filled inside can realize a double-material structure of being rigid outside and flexible inside. At the same time, when the entire cable is bent, its bending amplitude can be guaranteed and its toughness can be restored.

[0085] In any of the above schemes, preferably, a steel wire rope twisted armor layer 14 formed by twisting a plurality of steel wire ropes is provided between the inner sheath 3 and the outer braided layer 4 .

[0086] The steel wire rope twisted armor layer 14 can be used under relatively severe laying conditions, and effectively ensures the protection of the interior of the cable during laying.

[0087] In any of the above schemes, it is preferred that the twisted conductor unit includes a twisted bare wire 15 formed by twisting a plurality of thin copper wires, and an insulating flame retardant heat dissipation sheath 16 is tightly coated on the periphery of the twisted bare wire 15, and the outside of each insulating flame retardant heat dissipation sheath 16 is overmolded by the water-blocking and flame retardant filling paste layer 1, and a plurality of lateral heat dissipation channels 17 are evenly spaced along the circumference of the insulating flame retardant heat dissipation sheath 16, and each of the lateral heat dissipation channels 17 is used to conduct and dissipate the heat absorbed by the insulating flame retardant heat dissipation sheath 16 and dissipated by the twisted bare wire 15 to the outside through the aluminum film thermal conductive layer 7; the cross-section of each of the lateral heat dissipation channels 17 is a T-shaped structure.

[0088] The structure of the twisted bare conductor 15 formed by twisting a plurality of thin copper wires can reduce the mutual inductance and electromagnetic interference between cables, and can effectively reduce the impact of electromagnetic interference.

[0089] In addition, the insulating flame-retardant heat dissipation sheath 16 can utilize a plurality of lateral heat dissipation channels 17 to achieve rapid cavity heat dissipation and outward heat conduction while playing a flame-retardant role, thereby effectively improving the heat dissipation and heat conduction effect of the entire twisted conductor unit.

[0090] In any of the above solutions, preferably, the conductor at the center of the stranded bare conductor 15 is formed by drawing a hollow copper tube.

[0091] The present invention also provides a process for preparing a photoelectric hybrid cable, comprising the following steps:

[0092] Prepare the central optical fiber 8 and make the optical fiber unit through multiple steps;

[0093] Synchronously prepare each stranded conductor unit;

[0094] After the optical fiber unit and each twisted conductor unit are prepared, the optical fiber unit and each twisted conductor unit are positioned through the positioning holes on the extruder and the water-blocking and flame-retardant filling paste layer 1 is coated on the optical fiber unit and each twisted conductor unit;

[0095] Tightly wrap the aluminum film heat-conducting layer 7 and ensure the wrapping effect;

[0096] After the aluminum film heat conductive layer 7 is coated, a sample of appropriate length is cut off as a primary sample line, and a signal is sequentially input into the optical fiber unit and each twisted conductor unit is energized. The primary sample line is passed through a spark detector to realize the overall insulation test of each twisted conductor unit and the primary insulation result is recorded. Then, the primary sample line is passed through an anti-interference cable tester to detect the overall anti-interference test of each twisted conductor unit and the primary conductive anti-interference result is recorded. Finally, the primary sample line is passed through an optical communication comprehensive tester to detect the performance of the optical fiber unit and record the primary signal result. Thus, the primary sample line test is completed;

[0097] After the first sample line test meets the standard, continue to wrap the double-sided aluminum-plastic composite tape 2;

[0098] After the double-sided aluminum-plastic composite tape 2 is wrapped, a sample of appropriate length is cut as a secondary sample line, and the secondary sample line is tested according to the above-mentioned primary sample line testing method;

[0099] The use of primary sample line detection and secondary sample line detection in the process can effectively ensure the effective detection and control of the performance of the cable intermediates in the preparation process, and improve the qualification rate of the cable products; at the same time, according to the detection results of the primary sample line detection and the secondary sample line detection, it can be effectively judged that the current aluminum film thermal conductive layer 7 and the double-sided aluminum-plastic composite tape 2 meet the interference shielding effect on the entire optical fiber unit and each twisted conductor unit after wrapping, thereby ensuring that the product can achieve the purpose of anti-interference when used.

[0100] After the secondary sample line test is up to standard, the inner sheath 3 is extruded on the periphery of the double-sided aluminum-plastic composite belt 2 by an extruder and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape of the inner sheath 3 is qualified and the size is up to standard;

[0101] Covering the outer braided layer 4;

[0102] An outer sheath 5 is extruded on the periphery of the outer braided layer 4, and a diameter is measured by a high-precision laser measuring instrument to ensure that the shape and size of the outer sheath 5 are qualified, and the outer sheath 5 is wound onto a reel to obtain a rolled optoelectronic hybrid cable;

[0103] The rolled photoelectric hybrid cable is energized and immersed in water to detect the terminal insulation of the hybrid cable;

[0104] The water immersion insulation test can realize the final test of the insulation performance of the entire cable after winding, so as to obtain the insulation performance effect of the current cable product.

[0105] After the terminal insulation test is completed, it is packaged and waits for shipment.

[0106] In any of the above schemes, preferably, the specific steps of preparing the twisted conductor unit are as follows:

[0107] The copper tube and copper wire with an outer diameter of 10 mm are straightened and thinned into a thin copper tube center conductor 1501 and a thin copper wire 1502 through a drawing machine, and then they are respectively wound on a bobbin;

[0108] The wire drums each wound with the thin copper tube center conductor 1501 and the thin copper wire 1502 are sequentially placed into a cable twisting machine, and the thin copper tube center conductor 1501 and each thin copper wire 1502 are twisted by the high-speed rotation of the cable twisting machine to form a twisted bare conductor 15; during twisting, the thin copper tube center conductor 1501 is located at the center;

[0109] The insulating flame retardant heat dissipation sheath 16 is extruded on the outside of the twisted bare conductor 15 using an extrusion die having the same cross section as the insulating flame retardant heat dissipation sheath 16 and an extruder, and then rapidly solidified and cooled by chilled water to obtain a single twisted conductor unit.

[0110] The structure of the twisted bare conductor 15 formed by twisting a plurality of thin copper wires can reduce the mutual inductance and electromagnetic interference between cables, and can effectively reduce the impact of electromagnetic interference.

[0111] The central conductor adopts a thin copper tube central conductor 1501 with a hollow structure, which can ensure the heat dissipation effect of the thin copper tube central conductor 1501 when in use, while ensuring that its overall flexibility and bendability are improved.

[0112] The preparation method of the double-material reinforcing core 6 is as follows:

[0113] The thick-diameter aluminum tube in a coil is drawn by a drawing machine to form a hollow metal aluminum tube 601 that meets the size requirements;

[0114] The drawn hollow aluminum metal tube 601 passes horizontally through the high-temperature injection channel, and a hole is drilled on the upper surface of the hollow aluminum metal tube 601 at the current position by high-temperature drilling to form an injection hole connected to the central cavity inside the hollow aluminum metal tube 601;

[0115] High-temperature polyester rubber fluid is injected into the interior along the current injection drilling hole under high pressure to complete the filling of the inner central cavity of the hollow metal aluminum tube 601 within the current length range. After the injection is completed, the current injection drilling hole is sealed with aluminum liquid and cooled to form;

[0116] Repeat the above steps every 5m-10m, and repeat this process to complete the processing of the entire hollow aluminum metal tube 601;

[0117] The high-temperature injection molding channel that passes out of the high-temperature injection molding channel is cooled and then wound into a roll, and finally a double-material reinforcement core 6 is obtained.

[0118] The double-material reinforcement core 6 provided in the present invention is used as a reinforcement member, and its structure is rigid on the outside and flexible on the inside, so that it can effectively ensure a certain degree of bending resistance and realize toughness recovery after bending; when preparing the double-material reinforcement core 6, a special method of first drawing and then injection molding is adopted to realize the internal filling of flame-retardant polyester rubber fluid to realize the preparation of flexible material, and finally achieve good bending resistance, bending resistance and high recovery toughness.

[0119] In any of the above schemes, it is preferred that the high temperature inside the high-temperature injection channel heats the hollow metal aluminum tube 601 passing therethrough and serves to delay the solidification rate of the high-temperature polyester rubber fluid entering the central cavity of the hollow metal aluminum tube 601.

[0120] The high-temperature injection channel heats the hollow metal aluminum tube 601, which can increase the void filling rate inside the central cavity within a specified length when injecting the high-temperature polyester rubber fluid at high temperature and high pressure, and improve the filling effect of the internal high-temperature polyester rubber fluid. After the high-temperature polyester rubber fluid cools and solidifies, it forms a polyester rubber 602 with elasticity and toughness.

[0121] The optoelectronic hybrid low-voltage cable in the present invention utilizes a plurality of twisted conductor units to provide circumferential protection for the optical fiber unit located in the center, and cooperates with each double-material reinforcing core 6 to achieve circumferential reinforcement protection, so as to achieve the purpose of ensuring the stability of the entire cable structure; the water-blocking and flame-retardant filling paste layer 1 provided here protects the optical fiber unit, the double-material reinforcing core 6, and the twisted conductor unit, and can better fix them into a unified overall structure, and finally achieve the purpose of strengthening the stability of the internal optical fiber and cable; the double-sided aluminum-plastic composite tape 2 can be used for the purpose of waterproofing and shielding interference; at the same time, the inner sheath 3, the external braided layer 4 and the outer sheath 5 are cooperated to provide final restraint protection for the outside of the entire cable.

[0122] The optoelectronic hybrid cable product designed in the present invention places the optical fiber unit in the center in terms of layout, and at the same time, the twisted conductor units are arranged around it to effectively ensure the protection of the optical fiber unit in the center. In addition, multiple evenly distributed double-material reinforcing cores 6 are used to achieve overall rigidity reinforcement while ensuring its toughness, effectively ensuring the control of the bending degree and deformation return force when the product is laid and turned, reducing the risk of the optical fiber being broken, and ensuring the rigidity and toughness of the product; each twisted conductor unit is twisted, and at the same time, the insulating flame-retardant heat-dissipating sheath 16 sleeved on the outside is equipped with multiple lateral heat-dissipating channels 17, so as to ensure the overall heat dissipation effect of the entire hybrid cable under high load conditions. In addition, the aluminum film heat-conducting layer 7 is used to cooperate with the multiple lateral heat-dissipating channels 17 of each insulating flame-retardant heat-dissipating sheath 16 to achieve heat conduction and heat dissipation. The steel wire rope twisted armor layer 14 arranged on the outside of the entire optoelectronic hybrid cable is effectively suitable for laying and installation under harsh working conditions, ensuring effective protection of the internal structure, and further improving its surface toughness. When preparing the optoelectronic hybrid cable, multiple sampling tests are performed to detect insulation, signal effects, and line continuity, which can effectively ensure the good comprehensive performance of the prepared cable product. The multiple double-material reinforcing cores 6 provided in the present invention are all formed by a special method of first drawing and then injection cooling to achieve a double-material structure of the double-material reinforcing core 6 that is rigid outside and soft inside, which can better ensure rigidity while having a certain degree of flexibility.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement improvements or changes made to the implementation methods of the present invention fall within the protection scope of the present invention.

[0124] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Photoelectric hybrid low-voltage cable, characterized by: It comprises an optical fiber unit located in the center, a plurality of twisted conductor units are evenly arranged around the optical fiber unit, each of the twisted conductor units and the optical fiber unit is molded by coating with a water-blocking and flame-retardant filling paste layer, a double-sided aluminum-plastic composite tape is wrapped around the outside of the water-blocking and flame-retardant filling paste layer, an inner sheath is coated on the outside of the double-sided aluminum-plastic composite tape, an outer braided layer is coated on the periphery of the inner sheath, an outer sheath is extruded on the periphery of the outer braided layer, and a double-material reinforcing core is also arranged between two adjacent twisted conductor units; An aluminum film heat-conducting layer is also included between the double-sided aluminum-plastic composite tape and the water-blocking and flame-retardant filling paste layer, the aluminum film heat-conducting layer is wrapped around the outside of the water-blocking and flame-retardant filling paste layer, and the double-sided aluminum-plastic composite tape is wrapped around the outside of the aluminum film heat-conducting layer; The double-material reinforcement core comprises a hollow metal aluminum tube, the central cavity of the hollow metal aluminum tube is filled with polyester rubber, and the periphery of the hollow metal aluminum tube is covered and positioned by the water-blocking and flame-retardant filling paste layer; The twisted conductor unit includes a twisted bare conductor formed by a plurality of thin copper wires, an insulating flame-retardant heat dissipation sheath is tightly wrapped around the outer periphery of the twisted bare conductor, the outside of each insulating flame-retardant heat dissipation sheath is molded by overmolding the water-blocking flame-retardant filling paste layer, and a plurality of lateral heat dissipation channels are evenly spaced along the circumference of the insulating flame-retardant heat dissipation sheath, each of the lateral heat dissipation channels is used to conduct and dissipate the heat absorbed by the insulating flame-retardant heat dissipation sheath and emitted by the twisted bare conductor to the outside through the aluminum film heat conductive layer; the cross-section of each lateral heat dissipation channel is a T-shaped structure.

2. The optoelectronic hybrid low-voltage cable according to claim 1, characterized in that: The optical fiber unit includes a plurality of evenly distributed central optical fibers, each of which is molded by coating with an optical fiber filling layer, an anti-interference braided layer is wrapped on the outer wall of the optical fiber filling layer, a composite shielding sleeve is wrapped on the outside of the anti-interference braided layer, and an optical fiber sheath is coated on the periphery of the composite shielding sleeve.

3. The optoelectronic hybrid low-voltage cable according to claim 2, characterized in that: A steel wire rope twisted armor layer formed by twisting a plurality of steel wire ropes is arranged between the inner sheath layer and the outer braided layer.

4. A process for preparing a photoelectric hybrid cable, wherein the photoelectric hybrid cable is the photoelectric hybrid cable as claimed in claim 3, characterized in that: The preparation process of the optoelectronic hybrid cable comprises the following steps: Prepare the central optical fiber and make the optical fiber unit through multiple steps; Synchronously prepare each stranded conductor unit; After the optical fiber unit and each twisted conductor unit are prepared, the optical fiber unit and each twisted conductor unit are positioned through the positioning holes on the extruder and the water-blocking and flame-retardant filling paste layer is coated on the optical fiber unit and each twisted conductor unit; Tightly wrap the aluminum film heat-conducting layer and ensure the wrapping effect; After the aluminum film thermal conductive layer is coated, a sample of appropriate length is cut as a primary sample line, and the signal is passed through the optical fiber unit and each twisted conductor unit is energized in turn. The primary sample line is passed through a spark detector to detect the overall insulation of each twisted conductor unit and record the primary insulation result. Then, the primary sample line is passed through an anti-interference cable tester to detect the overall anti-interference of each twisted conductor unit and record the primary conductive anti-interference result. Finally, the primary sample line is passed through an optical communication comprehensive tester to detect the performance of the optical fiber unit and record the primary signal result. At this point, the primary sample line detection is completed; After the first sample line test meets the standard, continue to wrap the double-sided aluminum-plastic composite tape; After the double-sided aluminum-plastic composite tape is wrapped, a sample of appropriate length is cut as a secondary sample line, and the secondary sample line is tested according to the above-mentioned primary sample line testing method; After the secondary sample line test meets the standards, the inner sheath is extruded on the outer periphery of the double-sided aluminum-plastic composite belt by an extruder and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape of the inner sheath is qualified and the size meets the standards; Cover with outer braided layer; The outer sheath is extruded on the periphery of the outer braided layer, and the diameter is measured by a high-precision laser measuring instrument to ensure that the shape and size of the outer sheath are qualified, and then it is wound onto a reel to obtain a rolled optoelectronic hybrid cable; The rolled photoelectric hybrid cable is energized and immersed in water to detect the terminal insulation of the hybrid cable; After the terminal insulation test is completed, it is packaged and waits for shipment; The preparation method of the double-material reinforcement core is as follows: The thick-diameter aluminum tube in a coil is drawn and formed into a hollow metal aluminum tube meeting the size requirements by using a drawing machine; The drawn hollow aluminum metal tube passes horizontally through a high-temperature injection channel, and a hole is drilled on the upper surface of the hollow aluminum metal tube at the current position by high-temperature drilling to form an injection hole connected to the central cavity inside the tube; High-temperature polyester rubber fluid is injected into the interior along the current injection drilling hole under high pressure to complete the filling of the inner central cavity of the hollow metal aluminum tube within the current length range. After the injection is completed, the current injection drilling hole is sealed with aluminum liquid and cooled to form; Repeat the above steps every 5m-10m, and complete the processing of the entire hollow metal aluminum tube in this way; The high-temperature injection molding channel passing out of the high-temperature injection molding channel is cooled and wound into a roll, and finally a double-material reinforcement core is obtained; The specific steps of preparing the stranded conductor unit are as follows: Straighten and thin the copper tube and copper wire with an outer diameter of 10 mm through a drawing machine to form a thin copper tube central conductor and a thin copper wire, and wind them onto a bobbin respectively; The wire drums each wound with a thin copper tube center conductor and thin copper wire are sequentially placed into a cable twisting machine, and the thin copper tube center conductor and each thin copper wire are twisted by the high-speed rotation of the cable twisting machine to form a twisted bare wire; during twisting, the thin copper tube center conductor is located in the center; The insulating flame retardant heat dissipation sheath is extruded on the outside of the twisted bare conductor using an extrusion die having the same cross section as the insulating flame retardant heat dissipation sheath and an extruder, and is rapidly solidified and cooled by chilled water to obtain a single twisted conductor unit.

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