Optical fiber composite cable for mobile equipment

Abstract

The utility model relates to the technical field of cables, and particularly discloses an optical fiber composite cable for mobile equipment, which comprises a cable core consisting of a plurality of power wire cores and at least one optical fiber wire core, the plurality of power wire cores of the cable core are twisted together, and the optical fiber wire cores of the cable core are arranged at the twisting gaps of the outer sides of the two adjacent power wire cores. An inner sheath layer, an aramid yarn braid layer and an outer sheath layer are sequentially coated outside the cable core from inside to outside; the weaving pitch diameter ratio of the aramid yarn weaving layer is smaller than or equal to 3 times, and the weaving density is larger than or equal to 25%. According to the utility model, the optical fiber cores are protected from being twisted and damaged, the structure of the formed composite cable is compact, the formed composite cable can reliably realize high overall structural strength and obtain good bending and dragging performance, the technical requirements of mobile equipment in corresponding working conditions and environments are effectively met, and the service life of the cable is prolonged. The service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an optical fiber composite cable for mobile equipment with a rated voltage of 8.7 / 10 kV or below. Background Art

[0002] Cables with a rated voltage of 8.7 / 10kV and below are primarily used for power transmission to mobile equipment in working environments such as coal mines, ports, shield tunneling, and cranes. These cables form the power cables for these mobile devices. With the rapid development of intelligent technology in recent years, mobile equipment in these working environments often also involves signal transmission functions such as data acquisition and control command reception, which rely on optical fiber cores. To simplify and compact the cabling structure of these mobile devices, the optical fiber cores and power cores used in the same mobile equipment are combined to form optical fiber composite cables. For example, a Chinese patent document titled "A Metal-Shielded Optoelectronic Composite Rubber-Sheathed Flexible Cable for Coal Mining Machines" has the publication number CN 211264982 U and was published on August 14, 2020.

[0003] The above-mentioned mobile equipment needs to be frequently moved in the corresponding working environment, so the optical fiber composite cable used thereon should have high overall structural strength, bending and dragging performance.

[0004] Regarding the technology disclosed in publication number CN 211264982 U, to improve overall structural strength, a large amount of fiber-reinforced skeleton is filled outside the cable core covered by the sheath layer. Two layers of spiral armor are formed on the optical fiber core using stainless steel strips, and fiber tensile elements are also filled in. While this type of optical fiber composite cable has excellent overall structural strength, its molding structure is complex, which is not conducive to compact molding. Furthermore, its unit length weight is heavy, which directly reduces its bending performance. In other words, overall structural strength is improved at the expense of bending performance. Given the frequent movement (or position change) of mobile equipment, optical fiber composite cables with low bending performance are clearly less able to meet the technical requirements of mobile equipment, especially coal mine mobile equipment that frequently moves, and therefore have a shorter service life. Utility Model Content

[0005] The technical purpose of the present utility model is to provide a fiber optic composite cable for mobile devices with a compact structure, high overall structural strength, good bending performance and dragging performance, in view of the particularity of the above-mentioned mobile devices requiring power transmission and signal transmission, and the technical deficiencies of existing fiber optic composite cables.

[0006] The technical purpose of the utility model is achieved through the following technical solution: an optical fiber composite cable for mobile equipment, comprising a cable core composed of multiple power cores and at least one optical fiber core;

[0007] The multiple power cores of the cable core are twisted together, and the optical fiber cores of the cable core are arranged at the outer twisting gaps of two adjacent power cores;

[0008] The exterior of the cable core is sequentially covered with an inner sheath layer, an aramid yarn braided layer and an outer sheath layer from the inside out;

[0009] The braiding section diameter ratio of the aramid yarn braided layer is ≤3 times and the braiding density is ≥25%.

[0010] Furthermore, the cable core is composed of three power wire cores and one optical fiber wire core;

[0011] Three power line cores are twisted together, and the optical fiber core is arranged at the outer twisting gap between two adjacent power line cores at any position.

[0012] The above technical measures are targeted at the special needs of the above-mentioned mobile devices for power transmission and signal transmission, forming a composite cable core that integrates power transmission and signal transmission. In the molding structure of the composite cable core, the optical fiber core is arranged along the outer twisting gap of the power core. While facilitating the compactness of the cable core structure, the optical fiber core does not need to directly participate in the twisting and extrusion of the power core, which is beneficial to protecting the optical fiber core from twisting damage. Based on this composite cable core, a specific braided reinforcement layer is formed between the inner and outer sheath layers using an aramid yarn braided structure. The aramid yarn braided structure assumes the function of reinforcing the overall structural strength between the inner and outer sheath layers, eliminating the need for excessive filling of the composite cable core, which is beneficial to the compactness of the structure of the formed composite cable and improving the bending performance of the formed composite cable. Due to the characteristics of the specific aramid yarn braided structure with high structural strength, high modulus, high toughness, low weight, and high temperature resistance, the formed composite cable reliably achieves a high overall structural strength and obtains good towing performance, effectively meeting the technical requirements of mobile equipment in the corresponding working environment and having a long service life.

[0013] As one of the preferred technical solutions, the power core is composed of a power conductor, and a semi-conductive rubber inner shielding layer, an insulating layer, a semi-conductive rubber outer shielding layer and a reinforced shielding layer sequentially wrapped around the outside of the power conductor from the inside out.

[0014] Furthermore, the power conductor is formed by twisting multiple tinned copper wires in a concentric circle arrangement structure;

[0015] Each strand of tinned copper wire is formed by twisting a plurality of tinned copper wires with a diameter of 0.3 to 0.5 mm. The twisting direction of the tinned copper wires is opposite to the twisting direction of the power conductor.

[0016] Furthermore, the insulating layer is an extruded structure of hard EPDM rubber.

[0017] Furthermore, the reinforced shielding layer is a mixed braided structure of tinned copper wires and aramid wires outside the semi-conductive rubber outer shielding layer, with a braiding density of ≥85%.

[0018] The power line core of the above technical measures meets the technical requirements of power transmission with a maximum rated voltage of 8.7 / 10kV, has excellent anti-electromagnetic interference performance, stable power transmission, good structural compactness, bendability and dragging properties, and high structural strength.

[0019] As one of the preferred technical solutions, the optical fiber core is composed of a core body formed by twisting multiple optical fiber units around a central reinforcement core, and an optical fiber sheath layer extruded on the outside of the core body;

[0020] The optical fiber sheath layer is a fluoroplastic extruded structure.

[0021] Furthermore, the optical fiber unit is composed of a plurality of optical fiber conductors inserted into a sleeve layer, and optical fiber grease filled in the sleeve layer;

[0022] The optical fiber conductor is a G.657 bending loss insensitive optical fiber;

[0023] The sleeve layer is a fluoroplastic extrusion structure.

[0024] The optical fiber core of the above technical measures has good protection for the optical fiber conductor, which is beneficial to ensure that the optical fiber conductor is not damaged by twisting and extrusion during cabling, and has stable signal transmission and good high and low temperature resistance.

[0025] As one of the preferred technical solutions, the inner sheath layer is an extruded structure of EVM low-smoke halogen-free flame retardant rubber;

[0026] The outer sheath layer is an extruded structure of EVM low-smoke halogen-free flame retardant rubber;

[0027] The inner sheath layer and the outer sheath layer are embedded in each other through the aramid yarn braided layer.

[0028] The above-mentioned technical measures have good environmental protection for the sheath layer, and it does not produce harmful substances and produces less smoke when it burns in the event of fire, which meets the requirements of environmental protection technology. In addition, the inner and outer sheath layers are interwoven with the aramid yarn braid layer to ensure good integrity, which helps to improve the structural strength.

[0029] As one of the preferred technical solutions, the rated voltage of the optical fiber composite cable is up to 8.7 / 10 kV.

[0030] The beneficial technical effect of the present invention is as follows: the above technical measures are aimed at the special needs of the above mobile devices for power transmission and signal transmission, forming a composite cable core that integrates power transmission and signal transmission. In the molding structure of the composite cable core, the optical fiber core is arranged along the outer twisting gap of the power core, which is conducive to the compact structure of the cable core. At the same time, the optical fiber core does not need to directly participate in the twisting and extrusion of the power core, which is conducive to protecting the optical fiber core from twisting damage. On the basis of this composite cable core, a specific braided reinforcement layer is formed between the inner and outer sheath layers with an aramid yarn braided structure. The aramid yarn braided structure plays the role of reinforcing the overall structural strength between the inner and outer sheath layers, and there is no need to overfill the composite cable core, which is conducive to the compactness of the structure of the formed composite cable and improves the bending performance of the formed composite cable. Due to the characteristics of the specific aramid yarn braided structure with high structural strength, high modulus, high toughness, low weight, high temperature resistance, etc., the formed composite cable reliably achieves a high overall structural strength and obtains good towing performance, effectively meeting the technical requirements of mobile devices in corresponding working conditions and environments, and having a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of the present utility model.

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the optical fiber core.

[0033] The meaning of the codes in the figure are: 1—power line core; 11—power conductor; 12—semi-conductive rubber inner shield layer; 13—insulation layer; 14—semi-conductive rubber outer shield layer; 15—reinforced shield layer; 2—optical fiber core; 21—optical fiber unit; 211—optical fiber conductor; 212—optical fiber grease; 213—casing layer; 22—center reinforcement core; 23—optical fiber jacket layer; 3—inner jacket layer; 4—aramid braided layer; 5—outer jacket layer. DETAILED DESCRIPTION

[0034] The present invention relates to the field of cable technology, specifically an optical fiber composite cable for mobile equipment with a rated voltage of 8.7 / 10kV and below. The following describes the main technical solution of the present invention in detail with reference to several embodiments. Figure 1 and Figure 2 The technical solution of the present invention is clearly and in detail explained; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0035] It should be noted that the drawings of the present invention are schematic and have been simplified to clarify the technical objectives of the present invention, without necessarily obscuring the technical contribution of the present invention over the prior art. Furthermore, expressions such as "approximately" and "substantially" regarding quantities or fitting relationships below are intended to allow for reasonable assembly and processing errors within the industry, and do not literally represent absolute quantities or fitting relationships.

[0036] Example 1

[0037] See also Figure 1 and Figure 2 As shown, the utility model includes a cable core and an inner sheath layer 3, an aramid yarn braided layer 4 and an outer sheath layer 5 which are sequentially coated on the outside of the cable core from the inside out.

[0038] Specifically, the cable core has three power cores 1 and one optical fiber core 2. The three power cores 1 are twisted together, and the optical fiber core 2 is arranged in the outer twisting gap between two adjacent power cores 1 at any position. The outer diameter of the optical fiber core 2 is smaller than the outer diameter of the power core 1, which does not affect the twisting circle of the three power cores 1.

[0039] Each power line core 1 is composed of a power conductor 11, and a semi-conductive rubber inner shielding layer 12, an insulating layer 13, a semi-conductive rubber outer shielding layer 14 and a reinforced shielding layer 15, which are sequentially coated on the outside of the power conductor 11 from the inside out. The power conductor 11 is composed of multiple strands of tinned copper wires twisted in a concentric circle arrangement structure (for example, a 1+6 concentric circle arrangement structure); each strand of tinned copper wire is twisted from multiple tinned copper wires with a diameter of about 0.4mm. The twisting direction of the tinned copper wires is required to be opposite to the twisting direction of the power conductor 11. The power conductor 11 obtained in this way meets the technical requirements of the fifth category conductor of GB / T 3986-2008. The volume resistivity of the insulating layer 13 is ≥10 16 The extruded structure of hard EPDM rubber with a resistance of Ω·m and a tensile strength of ≥8 MPa offers high insulation performance, effectively meeting the technical requirements of the 8.7 / 10 kV voltage level. Its tensile strength also ensures resistance to deformation and dimensional stability during processing, thereby reliably guaranteeing stable insulation performance. The reinforced shield layer 15 is a mixed braid of tinned copper wire and aramid yarn outside the semi-conductive rubber outer shield layer 14. The braid density is approximately 88%, and the ratio of tinned copper wire to aramid yarn is approximately 1:1.

[0040] The optical fiber core 2 is composed of multiple optical fiber units 21 twisted around a central reinforcing core 22 (e.g., a 1+6 concentric circular arrangement), and an optical fiber jacket 23 extruded over the core. The optical fiber units 21 are comprised of six optical fiber conductors 211 threaded within a sleeve 213, and a fiber optic grease 212 encased within the sleeve 213 to coat each of the optical fiber conductors 211. The optical fiber conductors 211 are G.657 bend-loss-insensitive optical fibers with a minimum bending radius of 5-10 mm, meeting the minimum bending radius requirements during the processing and use of optical fiber composite cables. The fiber optic grease 212 is a high-temperature-resistant grease, ensuring excellent performance and stability during the vulcanization process. The sleeve 213 is an extruded fluoroplastic. Due to the presence of fluorine atoms in its molecular structure, the fluoroplastic is highly heat-resistant, suitable for long-term operation in temperatures between -80°C and 250°C, and resists deformation during the vulcanization process. The optical fiber sheath layer 23 is a fluoroplastic extruded structure. Similarly, since the molecular structure of fluoroplastic contains fluorine atoms, it has high heat resistance and is suitable for long-term operation in a temperature environment of -80 to 250°C. It is not easily deformed during the vulcanization process.

[0041] The inner sheath layer 3 is an extruded structure of EVM low-smoke halogen-free flame retardant rubber.

[0042] The aramid braided layer 4 is a braided structure of aramid yarns outside the inner sheath layer 3. The aramid braided layer 4 has six braids in the forward direction and six in the reverse direction, a pitch-to-diameter ratio of approximately 3, and a braid density of approximately 30%. This braided structure effectively covers the entire surface of the inner sheath layer 3 of the cable, making the cable's reinforcement performance more effective and reliable.

[0043] The outer sheath 5 is constructed of EVM low-smoke, halogen-free, flame-retardant rubber extruded over an aramid braided layer 4. During the extrusion and vulcanization process, the outer sheath 5 and inner sheath 3 are interlocked through the braided holes of the aramid braided layer 4, forming a single unit. The aramid braided layer 4 reinforces the sheath and the overall structure. The aramid braided layer 4, as a reinforcement, differs from traditional metal reinforcements (such as stainless steel strips or steel wire). Specifically, aramid, a new high-tech synthetic fiber, offers exceptional strength, high modulus, high-temperature resistance, acid and alkali resistance, and lightweight. Its strength is approximately 5-6 times that of steel wire, its modulus is approximately 2-3 times that of steel wire or fiberglass, and its toughness is approximately 2 times that of steel wire. Its weight is only about 1 / 5 that of steel wire, and it resists decomposition or melting even at temperatures of 560°C. The aramid braided layer 4, laminated between the inner sheath 3 and outer sheath 5 in this braided structure, can withstand external forces acting on the cable from all directions, providing high structural strength.

[0044] Example 2

[0045] The utility model comprises a cable core and an inner sheath layer, an aramid yarn braided layer and an outer sheath layer which are sequentially covered on the outside of the cable core from the inside out.

[0046] Specifically, the cable core has three power cores and one optical fiber core. The three power cores are twisted together, and the optical fiber core is arranged in the outer twisting gap between two adjacent power cores at any position. The outer diameter of the optical fiber core is smaller than that of the power core, which does not affect the twisting circle of the three power cores.

[0047] Each power line core consists of a power conductor, and a semi-conductive rubber inner shield layer, an insulating layer, a semi-conductive rubber outer shield layer, and a reinforced shield layer, which are wrapped around the outside of the power conductor in sequence from the inside out. The power conductor is made of multiple strands of tinned copper wire twisted in a concentric circle arrangement (for example, a 1+6+12 concentric circle arrangement); each strand of tinned copper wire is made of multiple tinned copper wires with a diameter of approximately 0.3mm. The stranding direction of the tinned copper wires is required to be opposite to the stranding direction of the power conductor. The resulting power conductor meets the technical requirements of Class V conductors in GB / T 3986-2008. The insulation layer has a volume resistivity of ≥10 16 The extruded structure of hard EPDM with a tensile strength of ≥8 MPa and a strength of 100 Ω·m offers high insulation performance, effectively meeting the technical requirements of the 8.7 / 10 kV voltage level. Its tensile strength also ensures resistance to deformation and dimensional stability during processing, thereby reliably guaranteeing stable insulation performance. The reinforced shield layer is a mixed braid of tinned copper wire and aramid yarn wrapped around the outer semi-conductive rubber shield. The braid density is approximately 85%, and the ratio of tinned copper wire to aramid yarn is approximately 1:1.

[0048] The optical fiber core is composed of multiple optical fiber units twisted around a central reinforcing core (for example, a 1+6 concentric circle arrangement), and an optical fiber sheath extruded around the core. The optical fiber units consist of eight optical fiber conductors threaded into a sheath layer, and an optical fiber grease encapsulated within the second sheath layer. The optical fiber conductors are G.657 bend-insensitive optical fibers with a minimum bending radius of 5 to 10 mm, meeting the minimum bending radius requirements during the processing and use of optical fiber composite cables. The optical fiber grease is high-temperature resistant, ensuring excellent performance and stability during the vulcanization process. The sheath layer is an extruded fluoroplastic structure. Due to the fluorine atoms in its molecular structure, fluoroplastics are highly heat-resistant, suitable for long-term operation in temperatures between -80°C and 250°C, and are not easily deformed during the vulcanization process. The optical fiber sheath layer is a fluoroplastic extruded structure. Similarly, since the molecular structure of fluoroplastic contains fluorine atoms, it has a high degree of heat resistance and is suitable for long-term operation in a temperature environment of -80 to 250°C. It is not easy to deform during the vulcanization process.

[0049] The inner sheath layer is an extruded structure of EVM low-smoke halogen-free flame-retardant rubber.

[0050] The aramid yarn braiding layer is a braiding structure of aramid yarn outside the inner sheath layer. In the braiding structure of the aramid yarn braiding layer, the number of braiding roots is 8 in positive direction and 8 in reverse direction, the braiding pitch ratio is about 2.5 times, and the braiding density is about 40%. The braiding structure can effectively cover the aramid yarn on the surface of the inner sheath layer of the whole cable, so that the cable reinforcing performance is more effective and reliable.

[0051] The outer sheath layer is an extruded structure of EVM low-smoke halogen-free flame-retardant rubber outside the aramid yarn braiding layer. The outer sheath layer and the inner sheath layer are mutually embedded through the braiding holes of the aramid yarn braiding layer during the extrusion vulcanization process, forming a whole, and the aramid yarn braiding layer strengthens the sheath structure and the whole structure. The aramid yarn braiding layer as a reinforcing structure is different from the traditional metal (such as stainless steel belt or steel wire) reinforcement. Specifically, the aramid yarn is a new type of high-tech synthetic fiber, which has the technical characteristics of ultrahigh strength, high modulus, high temperature resistance, acid resistance, alkali resistance, light weight, etc. The strength is about 5-6 times that of steel wire, the modulus is about 2-3 times that of steel wire or glass fiber, the toughness is about 2 times that of steel wire, and the weight is only about 1 / 5 of that of steel wire. Even at a temperature of 560℃, it does not decompose or melt. The aramid yarn braiding layer composed of the above braiding structure between the inner sheath layer and the outer sheath layer can resist external forces applied to the cable from all directions, and has high structural strength.

[0052] Embodiment 3

[0053] The utility model discloses a cable core and the inner sheath layer, aramid yarn braiding layer and outer sheath layer that are sequentially covered outside the cable core from inside to outside.

[0054] Specifically, the cable core has three power line cores and one optical fiber core. The three power line cores are twisted together, and the optical fiber core is arranged at the twisted gap outside the adjacent two power line cores at any position. The outer diameter of the optical fiber core is smaller than that of the power line core, and does not affect the twisted roundness of the three power line cores.

[0055] Each power line core is composed of a power conductor, an inner semi-conductive rubber shielding layer, an insulation layer, an outer semi-conductive rubber shielding layer and a reinforcing shielding layer, which are sequentially covered outside the power conductor. The power conductor is twisted by multiple tinned copper wires in a concentric circular arrangement structure (for example, a concentric circular arrangement structure of 1+6). Each tinned copper wire is twisted by multiple tinned copper wire bundles with a diameter of about 0.5mm. The twisting direction of the tinned copper wire bundle is opposite to the twisting direction of the power conductor, so that the obtained power conductor meets the technical requirements of the fifth type conductor in GB / T 3986-2008. The insulation layer is made of EVM low-smoke halogen-free flame-retardant rubber with a volume resistivity of greater than or equal to 10 16The extruded structure of hard EPDM with a tensile strength of ≥8 MPa and a strength of 100 Ω·m offers high insulation performance, effectively meeting the technical requirements of the 8.7 / 10 kV voltage level. Its tensile strength also ensures resistance to deformation and dimensional stability during processing, thereby reliably guaranteeing stable insulation performance. The reinforced shield layer is a mixed braid of tinned copper wire and aramid yarn wrapped around the outer semi-conductive rubber shield. The braid density is approximately 90%, and the ratio of tinned copper wire to aramid yarn is 1.5:1.

[0056] The optical fiber core is composed of multiple optical fiber units twisted around a central reinforcing core (for example, a 1+6 concentric circle arrangement), and an optical fiber sheath extruded around the core. The optical fiber units consist of seven optical fiber conductors threaded into a sheath layer, and an optical fiber grease encapsulated within the second sheath layer. The optical fiber conductors are G.657 bend-insensitive optical fibers with a minimum bending radius of 5 to 10 mm, meeting the minimum bending radius requirements during the processing and use of optical fiber composite cables. The optical fiber grease is high-temperature resistant, ensuring excellent performance and stability during the vulcanization process. The sheath layer is an extruded fluoroplastic structure. Due to the fluorine atoms in its molecular structure, fluoroplastics are highly heat-resistant, suitable for long-term operation in temperatures between -80°C and 250°C, and are not easily deformed during the vulcanization process. The optical fiber sheath layer is a fluoroplastic extruded structure. Similarly, since the molecular structure of fluoroplastic contains fluorine atoms, it has a high degree of heat resistance and is suitable for long-term operation in a temperature environment of -80 to 250°C. It is not easy to deform during the vulcanization process.

[0057] The inner sheath layer is an extruded structure of EVM low-smoke halogen-free flame retardant rubber.

[0058] The aramid braid is a structure in which aramid yarns are woven outside the inner sheath. The braided structure of the aramid braid consists of seven strands in the forward direction and seven strands in the reverse direction, with a pitch-to-diameter ratio of approximately 2 and a braid density of approximately 45%. This braided structure effectively covers the entire surface of the cable's inner sheath, making the cable's reinforcement more effective and reliable.

[0059] The outer sheath is constructed of EVM low-smoke, halogen-free, flame-retardant rubber extruded over an aramid braided layer. During the extrusion and vulcanization process, the outer and inner sheaths are interlocked through the woven holes of the aramid braid, forming a single unit. The aramid braid reinforces the sheath and the cable as a whole. The aramid braid, as a reinforcement, differs from traditional metal reinforcements (such as stainless steel strips or steel wire). Specifically, aramid, a new high-tech synthetic fiber, offers exceptional strength, high modulus, high-temperature resistance, acid and alkali resistance, and lightweight. Its strength is approximately 5-6 times that of steel wire, its modulus is approximately 2-3 times that of steel wire or fiberglass, and its toughness is approximately 2 times that of steel wire. Its weight is only about 1 / 5 that of steel wire, and it resists decomposition or melting even at temperatures of 560°C. The aramid braid, laminated between the inner and outer sheaths in this braided structure, can withstand external forces acting on the cable from all directions, providing high structural strength.

[0060] Example 4

[0061] The utility model comprises a cable core and an inner sheath layer, an aramid yarn braided layer and an outer sheath layer which are sequentially covered on the outside of the cable core from the inside out.

[0062] Specifically, the cable core has three power cores and one optical fiber core. The three power cores are twisted together, and the optical fiber core is arranged in the outer twisting gap between two adjacent power cores at any position. The outer diameter of the optical fiber core is smaller than that of the power core, which does not affect the twisting circle of the three power cores.

[0063] Each power line core consists of a power conductor, and a semi-conductive rubber inner shield layer, an insulating layer, a semi-conductive rubber outer shield layer, and a reinforced shield layer, which are wrapped around the outside of the power conductor in sequence from the inside out. The power conductor is made of multiple strands of tinned copper wire twisted in a concentric circle arrangement (for example, a 1+6+12 concentric circle arrangement); each strand of tinned copper wire is made of multiple tinned copper wires with a diameter of approximately 0.35mm. The stranding direction of the tinned copper wires is required to be opposite to the stranding direction of the power conductor. The resulting power conductor meets the technical requirements of the fifth category conductor in GB / T 3986-2008. The volume resistivity of the insulation layer is ≥10 16 The extruded structure of hard EPDM with a tensile strength of ≥8 MPa and a strength of 100 Ω·m offers high insulation performance, effectively meeting the technical requirements of the 8.7 / 10 kV voltage level. Its tensile strength also ensures resistance to deformation and dimensional stability during processing, thereby reliably guaranteeing stable insulation performance. The reinforced shield layer is a mixed braid of tinned copper and aramid yarns wrapped around the outer semi-conductive rubber shield. The braid density is approximately 85%, and the ratio of tinned copper to aramid yarn is 1.2:1.

[0064] The optical fiber core is a core body (for example, a concentric circular arrangement structure of 1+6) composed of a plurality of optical fiber units stranded around a central reinforcing core, and an optical fiber sheath layer extruded outside the core body. The optical fiber unit is composed of eight optical fiber conductors sleeved in the sleeve layer and optical fiber ointment filled in the sleeve layer II to cover the optical fiber conductors. The optical fiber conductor is a G.657 bending loss insensitive optical fiber, the minimum bending radius of the optical fiber conductor can reach 5-10 mm, meeting the technical requirements of the minimum bending radius in the processing and use of the optical fiber composite cable. The optical fiber ointment is high-temperature-resistant optical fiber ointment, so that the optical fiber ointment maintains good performance stability in the vulcanization processing. The sleeve layer is a fluoroplastic extrusion structure. Since the fluoroplastic molecule structure contains fluorine atoms, it has high heat resistance and is suitable for long-term work in a temperature environment of-80-250℃ and is not easy to deform in the vulcanization processing. The optical fiber sheath layer is a fluoroplastic extrusion structure. For the same reason, since the fluoroplastic molecule structure contains fluorine atoms, it has high heat resistance and is suitable for long-term work in a temperature environment of-80-250℃ and is not easy to deform in the vulcanization processing.

[0065] The inner sheath layer is an extrusion structure of EVM low-smoke halogen-free flame-retardant rubber.

[0066] The aramid yarn braiding layer is a braiding structure of aramid yarn outside the inner sheath layer. In the braiding structure of the aramid yarn braiding layer, the braiding number is 5 forward and 5 reverse, the braiding pitch ratio is about 3 times, and the braiding density is about 25%. The braiding structure can effectively cover the aramid yarn on the surface of the inner sheath layer of the whole cable, so that the cable reinforcing performance is more effective and reliable.

[0067] The outer sheath layer is an extrusion structure of EVM low-smoke halogen-free flame-retardant rubber outside the aramid yarn braiding layer. The outer sheath layer and the inner sheath layer are mutually embedded through the braiding holes of the aramid yarn braiding layer in the extrusion vulcanization process, forming a whole, and the aramid yarn braiding layer strengthens the sheath structure and the whole structure. The aramid yarn braiding layer as a reinforcing structure is different from the traditional metal (for example, stainless steel belt or steel wire) reinforcement. Specifically, the aramid yarn is a new type of high-tech synthetic fiber with the technical characteristics of ultra-high strength, high modulus, high temperature resistance, acid resistance, alkali resistance, light weight, etc. Its strength is about 5-6 times that of steel wire, its modulus is about 2-3 times that of steel wire or glass fiber, its toughness is about 2 times that of steel wire, and its weight is only about 1 / 5 of that of steel wire. Even at a temperature of 560℃, it does not decompose or melt. The aramid yarn braiding layer composed of the above braiding structure between the inner sheath layer and the outer sheath layer can resist external forces applied to the cable from all directions, and has high structural strength.

[0068] The above embodiments are only used to illustrate the present application, but not to limit it.

[0069] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent replacements for some of the technical features therein; 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. An optical fiber composite cable for mobile equipment, comprising a cable core consisting of a plurality of power cores (1) and at least one optical fiber core (2); Its characteristics are: The plurality of power cores (1) of the cable core are twisted together, and the optical fiber cores (2) of the cable core are arranged at the outer twisting gaps between two adjacent power cores (1); The exterior of the cable core is sequentially coated with an inner sheath layer (3), an aramid yarn braided layer (4), and an outer sheath layer (5) from the inside out; The braiding pitch-to-diameter ratio of the aramid yarn braided layer (4) is ≤3 times, and the braiding density is ≥25%.

2. The optical fiber composite cable for mobile devices according to claim 1, characterized in that: The cable core is composed of three power line cores (1) and one optical fiber line core (2); Three power line cores (1) are twisted together, and the optical fiber core (2) is arranged at the outer twisting gap between two adjacent power line cores (1) at any position.

3. The optical fiber composite cable for mobile devices according to claim 1 or 2, characterized in that: The power line core (1) is composed of a power conductor (11), and a semi-conductive rubber inner shielding layer (12), an insulating layer (13), a semi-conductive rubber outer shielding layer (14), and a reinforced shielding layer (15) which are sequentially coated on the outside of the power conductor (11) from the inside out.

4. The optical fiber composite cable for mobile devices according to claim 3, characterized in that: The power conductor (11) is formed by twisting a plurality of tinned copper wires in a concentric circle arrangement structure; Each strand of tinned copper wire is formed by twisting a plurality of tinned copper wires with a diameter of 0.3 to 0.5 mm, and the twisting direction of the tinned copper wires is opposite to the twisting direction of the power conductor (11).

5. The optical fiber composite cable for mobile devices according to claim 3, wherein: The insulating layer (13) is an extruded structure of hard EPDM rubber.

6. The optical fiber composite cable for mobile devices according to claim 3, characterized in that: The reinforced shielding layer (15) is a mixed braided structure of tinned copper wire and aramid wire outside the semi-conductive rubber outer shielding layer (14), with a braiding density of ≥85%.

7. The optical fiber composite cable for mobile devices according to claim 1 or 2, characterized in that: The optical fiber core (2) is composed of a core body formed by twisting a plurality of optical fiber units (21) around a central reinforcing core (22), and an optical fiber sheath layer (23) extruded outside the core body; The optical fiber sheath layer (23) is a fluoroplastic extruded structure.

8. The optical fiber composite cable for mobile devices according to claim 7, characterized in that: The optical fiber unit (21) is composed of a plurality of optical fiber conductors (211) inserted into a sleeve layer (213), and optical fiber grease (212) filled in the sleeve layer (213); The optical fiber conductor (211) is a G.657 bending loss insensitive optical fiber; The sleeve layer (213) is a fluoroplastic extrusion structure.

9. The optical fiber composite cable for mobile devices according to claim 1, characterized in that: The inner sheath layer (3) is an extruded structure of EVM low-smoke halogen-free flame-retardant rubber; The outer sheath layer (5) is an extruded structure of EVM low-smoke halogen-free flame-retardant rubber; The inner sheath layer (3) and the outer sheath layer (5) are embedded in each other via the aramid yarn braided layer (4).

10. The optical fiber composite cable for mobile devices according to claim 1, characterized in that: The rated voltage of the optical fiber composite cable is up to 8.7 / 10 kV.

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