Novel smooth aluminum sheath low-voltage cable

Abstract

The invention discloses a novel smooth aluminum sheath low-voltage cable. The periphery of a water-blocking aluminum conductor is coated with a conductor shielding layer; the periphery of the conductor shielding layer is coated with a polypropylene insulating layer; the periphery of the polypropylene insulating layer is coated with an insulating shielding layer; the periphery of the insulation shielding layer is wrapped by a first semi-conductive water-blocking expansion belt. A copper wire shielding layer is wrapped on the periphery of the semi-conductive water-blocking expansion belt; the periphery of the copper wire shielding layer is wrapped with a tightening copper strip layer; the periphery of the tightening copper strip layer is coated with a second semi-conductive water-blocking expansion strip; an aluminum-plastic composite belt layer is arranged on the periphery of the second semi-conductive water-blocking expansion belt; the periphery of the aluminum-plastic composite belt layer is provided with a polymer sheath layer. The periphery of the polymer sheath layer is provided with an aluminum sheath layer. The periphery of the aluminum sheath layer is provided with a belting layer. The periphery of the belting layer is provided with a PE sheath layer. The periphery of the PE sheath layer is provided with a galvanized steel wire armor layer, and the periphery of the PE sheath layer is provided with two protective layers. The novel smooth aluminum sheath low-voltage cable is high in mechanical strength and high in waterproofness and corrosion resistance.

Description

Technical Field

[0001] The invention relates to a novel smooth aluminum sheathed low-voltage cable. Background Art

[0002] With the continuous development of society, the urbanization process is accelerating, the power load is getting larger and larger, and the safety requirements of power supply and transmission systems are getting higher and higher. At the same time, according to the needs of urban beautification and the vigorous implementation of national urban network transformation, the requirements for large-section and long-length power cables are getting higher and higher, so that overhead lines can be buried underground to achieve urban beauty. In large-scale engineering projects, such as tunnel cable laying and cables used in petrochemical sites, the requirements for the waterproof performance of cables and corrosion resistance against oils and chemical solvents are very high. In addition to the mechanical and physical properties and electrical properties of ordinary plastic insulated and sheathed power cable products, the cables used in such places should also have high waterproofness, high corrosion resistance, high anti-interference and high resistance to strong mechanical impact.

[0003] At present, the traditional waterproof cables on the market use cross-linked polyethylene insulation, corrugated aluminum sheath, environmentally friendly modified polypropylene insulation smooth aluminum sheath, semi-conductive buffer resistor water layer, corrugated aluminum sheath, asphalt coating layer for waterproof and corrosion resistance. The waterproof, corrosion resistance, anti-interference and strong mechanical impact resistance of such a structure cannot meet the needs of long-term buried cable laying in special sites. After long-term use, it is easy to have line problems such as breakage and derailment, thus affecting the power safety of large facilities. Summary of the invention

[0004] The present invention provides a new type of smooth aluminum sheathed low-voltage cable to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0005] A novel smooth aluminum sheathed low-voltage cable comprises: a water-blocking aluminum conductor; the outer periphery of the water-blocking aluminum conductor is coated with a conductor shielding layer for fastening the water-blocking aluminum conductor to shield the water-blocking aluminum conductor; the outer periphery of the conductor shielding layer is coated with a polypropylene insulation layer for insulating the conductor; the outer periphery of the polypropylene insulation layer is coated with an insulation shielding layer for protecting the polypropylene insulation layer; the outer periphery of the insulation shielding layer is coated with a first semiconducting water-swellable tape for improving waterproof performance; the outer periphery of the semiconducting water-swellable tape is coated with a copper wire shielding layer for electrical shielding; the outer periphery of the copper wire shielding layer is wrapped with a tightening copper tape layer for tightening the copper wire shielding layer; the outer periphery of the tightening copper tape layer is coated with a second semiconducting water-swellable tape for waterproofing the internal metal material; An aluminum-plastic composite tape layer is provided on the periphery of the semiconductor water-swellable tape for improving the structural strength and stress absorption capacity of the cable; a polymer sheath layer is provided on the periphery of the aluminum-plastic composite tape layer for buffering the torsional stress of the cable; an aluminum sheath layer is provided on the periphery of the polymer sheath layer for improving the water-blocking performance; a tape layer is provided on the periphery of the aluminum sheath layer for further waterproofing; a PE sheath layer is provided on the periphery of the tape layer for protecting the internal structure of the cable; a galvanized steel wire armor layer is provided on the periphery of the PE sheath layer for improving the mechanical strength of the cable; an outer sheath layer is provided on the periphery of the galvanized steel wire armor layer for elastically supporting and protecting the galvanized steel wire armor layer; a nylon protective layer is provided on the periphery of the outer sheath layer for improving the dragging smoothness and support of the cable.

[0006] Furthermore, a plurality of mutually engaging mutually embedded parts are formed on the mutually contacting sides of the nylon protective layer and the outer sheath layer; a plurality of outward-facing steel wires are woven circumferentially on the outer periphery of the galvanized steel wire armor layer by a weaving process; a clamping hole for clamping the outward-facing steel wire is formed on the side of the outer sheath layer for contacting the galvanized steel wire armor layer; the groove bottom of the clamping hole extends into the mutually embedded part, so that the outward-facing steel wire and the mutually embedded part constitute a connected whole.

[0007] Furthermore, a plurality of outwardly extending steel wires and the mutually embedded parts constitute a connected whole through which a first connecting steel wire is commonly passed for connecting the plurality of wholes in series into a braided whole; the first connecting steel wire is spirally shaped and is passed through the inner side of the outwardly extending steel wire when spirally extending.

[0008] Furthermore, a plurality of inward-spreading steel wires are braided in the circumferential direction on the inner circumference of the galvanized steel wire armor layer by a braiding process; the PE sheath layer is formed with embedding holes for embedding and installing the inward-spreading steel wires; and the inward-spreading steel wires are embedded and installed in the groove bottom of the embedding holes.

[0009] Furthermore, a second series-connected steel wire is inserted into the PE sheath layer; the second series-connected steel wire is spirally shaped, and is inserted into the inner side of the inner-spreading steel wire when spirally shaped.

[0010] Furthermore, both stripping ends of the novel smooth aluminum sheathed low-voltage cable are sleeved with a clamping ring for clamping the two ends of the cable;

[0011] The clamping ring is provided with a fixing portion for fixing to a location where the cable is connected.

[0012] Furthermore, the clamping ring is also provided with a connecting portion for fixedly connecting the portions of the first series-connected steel wire and the second series-connected steel wire extending out of the cable.

[0013] Furthermore, the connecting portion is formed with a self-locking rod and a self-locking plug rod for self-locking the first series of steel wires and the second series of steel wires; the self-locking plug rod is detachably inserted into the plug hole formed in the connecting portion, and is arranged in parallel with the self-locking rod; the first series of steel wires or the second series of steel wires are wound along the overall outer periphery formed by the self-locking rod and the self-locking plug rod, and the terminal is fixed in the connecting hole at one end of the self-locking plug rod; the self-locking plug rod is pulled out in the opposite direction of the spiral winding of the first series of steel wires or the second series of steel wires; the end of the first series of steel wires or the second series of steel wires is locked by the part of itself that is wound, and the self-locking plug rod locks the end of the first series of steel wires or the second series of steel wires to prevent them from falling off.

[0014] Furthermore, the spiral directions of the first series-connected steel wire and the second series-connected steel wire are opposite.

[0015] Furthermore, a clamping foot for gripping the copper wires of the copper wire shielding layer is formed on the inner side of the tightening copper tape layer; the copper tape of the tightening copper tape layer is a mesh structure with high mechanical ductility.

[0016] The invention is beneficial in that the overall structure of the new smooth aluminum sheathed low-voltage cable provided is high in mechanical strength, is not easy to break or derail after long-term use, has strong torsion and tensile resistance during laying, is suitable for a variety of laying sites, and the structure of the cable body makes laying easier and is not easy to twist. At the same time, the new smooth aluminum sheathed low-voltage cable of this scheme has excellent waterproof and corrosion resistance, strong impact resistance, good shockproof effect, longer life when buried for a long time, is not prone to line problems, and ensures the safety of the power use site. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of a new type of smooth aluminum sheathed low-voltage cable involved in the present application;

[0019] A novel smooth aluminum sheathed low-voltage cable 10, a water-blocking aluminum conductor 11, a conductor shielding layer 12, a polypropylene insulation layer 13, an insulation shielding layer 14, a first semiconducting water-swellable tape 15, a copper wire shielding layer 16, a tightening copper tape layer 17, a second semiconducting water-swellable tape 18, an aluminum-plastic composite tape layer 19, a polymer sheath layer 20, an aluminum sheath layer 21, a tape layer 22, a PE sheath layer 23, an embedding hole 231, a galvanized steel wire armor layer 24, an outwardly extending steel wire 241, an innerly extending steel wire 242, an outer sheath layer 25, a clamping hole 251, a nylon protective layer 26, a mutually embedded portion 27, a first series-connected steel wire 28, a second series-connected steel wire 29, a clamping ring 30, a fixing portion 301, a connecting portion 302, a self-locking rod 303, and a self-locking plug rod 304. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] like Figure 1As shown, a new type of smooth aluminum sheathed low-voltage cable 10 of the present application is used, which adopts a water-blocking aluminum conductor 11 for conduction. The water-blocking aluminum conductor 11 is made of aluminum alloy profile wire monofilaments compressed and twisted, and the profile wire monofilaments are preferably T-shaped, with a compact structure and a filling factor of up to 98%. Compared with the same specification round monofilament compressed conductor (filling factor does not exceed 92%), the conductor outer diameter is smaller, and the material coated on the outside of the conductor is less. In addition, the resistivity of the profile wire compressed and twisted conductor is lower than that of the round monofilament compressed conductor, and the cross-section is more optimized compared with the same specification, saving materials and costs. The conductivity of the aluminum alloy material of the water-blocking aluminum conductor 11 is 61.5% of copper IACS, and the current carrying capacity is 79% of copper, which is better than the pure aluminum standard. Compared with pure aluminum conductors: its creep resistance is improved by 300%, preventing relaxation problems caused by cold flow or creep: aluminum alloy also has greater tensile strength, with a density of 2.71g / cm3 and a density of 8.89g / cm3 for copper, and can support a deadweight of 4,000 meters in length, while copper conductor cables can only support 2,750 meters. Aluminum alloy conductors also have good corrosion resistance, forming a thin and strong oxide layer when the surface comes into contact with air, which is resistant to various forms of corrosion.

[0024] The outer periphery of the water-blocking aluminum conductor 11 is coated with a conductor shielding layer 12 for fastening the water-blocking aluminum conductor 11 to shield the water-blocking aluminum conductor 11. The conductor shielding layer 12 is made of a cross-linked conductor semi-conductive shielding material with a thickness of 0.7 mm±0.1 mm.

[0025] The conductor shielding layer 12 is coated with a polypropylene insulation layer 13 for insulating the conductor. The polypropylene insulation layer 13 is made of 35kV and below polypropylene insulation material, with a thickness of 10.5mm±0.5mm.

[0026] An insulating shielding layer 14 is coated on the outer periphery of the polypropylene insulating layer 13 to protect the polypropylene insulating layer 13. The insulating shielding layer 14 is made of ultra-smooth semi-conductive shielding material for cross-linked cables, and has a thickness of 0.8 mm±0.1 mm.

[0027] The outer periphery of the insulating shielding layer 14 is wrapped with a first semiconducting water-swellable tape 15 for improving the waterproof performance. The outer periphery of the semiconducting water-swellable tape is wrapped with a copper wire shielding layer 16 for electrical shielding. The outer periphery of the copper wire shielding layer 16 is wrapped with a tightening copper tape layer 17 for tightening the copper wire shielding layer 16. The outer periphery of the tightening copper tape layer 17 is coated with a second semiconducting water-swellable tape 18 for waterproofing the internal metal material. The outer periphery of the second semiconducting water-swellable tape 18 is provided with an aluminum-plastic composite tape layer 19 to improve the structural strength and stress absorption capacity of the cable. The overlap rate of the first semiconducting water-swellable tape 15 and the second semiconducting water-swellable tape 18 is 15-25%. The thickness of the copper wire shielding layer 16 is 0.9mm. The tightening copper tape layer 17 is made of 0.1mm copper tape for reverse tying.

[0028] As a specific implementation, a clamping foot for gripping the copper wire of the copper wire shielding layer 16 is formed on the inner side of the tightening copper tape layer 17. The flexible limiting effect of the clamping angle can ensure the stability of the gap distance between the copper wires, thereby ensuring the shielding performance. The structure of the clamping foot can be clearly known from the text description. The distribution position of the clamping foot on one side of the tightening copper tape layer 17 can be designed according to the specific cable size. Since copper has the ability to deform, the position of the clamping foot can have a certain error, and it does not affect its clamping and sealing function for the copper wire of the copper wire shielding layer 16. The copper tape that tightens the copper tape layer 17 is a mesh structure with high mechanical ductility. The mesh-like copper tape can be elastically expanded and contracted when the cable is rolled up, ensuring the mechanical elasticity of the cable and the ductility of the cable.

[0029] Furthermore, a polymer sheath layer 20 is provided on the periphery of the aluminum-plastic composite tape layer 19 to buffer the torsional stress of the cable. An aluminum sheath layer 21 is provided on the periphery of the polymer sheath layer 20 to improve the water-blocking performance. A tape layer 22 is provided on the periphery of the aluminum sheath layer 21 to further waterproof.

[0030] The above-mentioned novel smooth aluminum sheathed low-voltage cable 10 has excellent water-blocking performance. Firstly, the conductor adopts a water-blocking aluminum conductor 11 of tightly twisted wire, with a filling coefficient of up to 98%, and a small gap between each single wire, which can effectively prevent water diffusion; secondly, the present invention has multiple alternating water-blocking layers, namely: an insulating shielding layer 14, a first semi-conductive water-swellable tape 15, a second semi-conductive water-swellable tape 18, an aluminum-plastic composite tape layer 19, an aluminum sheath layer 21, and a wrapping tape layer 22.

[0031] The insulating shielding layer 14, the first semiconducting water-swellable tape 15, the second semiconducting water-swellable tape 18 and the wrapping tape layer 22 have the characteristics of strong water absorption and high expansion rate, can strongly absorb water and expand rapidly to form a gel-like substance to block the water seepage channel, thus forming multiple layers of alternating water-blocking layers, which can effectively improve the waterproof performance of the cable.

[0032] That is to say, the present invention can achieve excellent radial and longitudinal water-blocking effects through the above multiple alternating water-blocking layers. The arrangement of the tightening copper tape layer 17, the aluminum-plastic composite tape layer 19, the polymer sheath layer 20 and the aluminum sheath layer 21 between the multiple water-blocking layers can effectively improve the tensile strength, tearing strength, environmental stress resistance (not easy to crack), low temperature resistance, heat resistance and puncture resistance while ensuring waterproofness. The aluminum sheath layer 21 adopts a smooth aluminum sheath layer 21, which has good sealing and close fit, can effectively prevent water and other corrosive liquids from penetrating, and has better anti-corrosion performance.

[0033] For smooth aluminum sheath, the preferred welding process is argon arc welding. Attention should be paid to the inert gas flow, welding current, and the distance between the welding core and the welding material to avoid leakage, loose welding, over-welding and holes, etc. In addition, the aluminum plate (strip) used should be smooth, especially the welding part should be flat and smooth to avoid affecting the welding quality.

[0034] Based on the above technical solution: a PE sheath layer 23 is provided on the outer periphery of the tape layer 22 to protect the internal structure of the cable; a galvanized steel wire armor layer 24 is provided on the outer periphery of the PE sheath layer 23 to improve the mechanical strength of the cable; an outer sheath layer 25 is provided on the outer periphery of the galvanized steel wire armor layer 24 to elastically support and protect the galvanized steel wire armor layer 24; a nylon protective layer 26 is provided on the outer periphery of the outer sheath layer 25 to improve the dragging smoothness and support of the cable.

[0035] The new type of smooth aluminum sheath low-voltage cable 10 of the present invention adopts an aluminum sheath layer 21 of a smooth aluminum sheath combined with an external galvanized steel wire armor layer 24, which has good mechanical and electrical properties: ① good tensile performance, can withstand large tensile force, is not easy to be damaged during laying and traction, and can withstand large deadweight when laid in places with large drop; ② good compressive performance, no steel belt is required when used for underground laying, and the internal wire core can be protected from damage when laid on gravel ground; ③ the metal layer has good creep resistance, and it is not easy to deform the metal lattice and destroy the shape under the influence of deadweight, temperature and internal force; ④ good vibration resistance, no additional shockproof device is required in general vibration places. Such as: bridge frames, railways, and highways; ⑤ aluminum sheaths and galvanized steel wires have good shielding performance, which can shield surrounding electromagnetic interference and ensure stable current and signal transmission. Their conductivity is also better than that of steel belts and steel wires, and they can carry larger fault currents and ensure the safety of the lines.

[0036] The galvanized steel wire armor layer 24 is used to protect the cable from damage and destruction by external mechanical forces, and can also prevent rats and termites from biting, so as not to cause power transmission problems through the armor, and ensure the excellent bending performance and drag resistance of the wire. At the same time, the galvanized steel wire armor layer 24 also has a shielding effect, which can shield the electromagnetic interference generated, and has the advantages of light weight. The tightly woven galvanized steel wire armor layer 24 is used for protection, which can effectively protect the integrity of the cable structure and electrical performance, and improve the service life of the cable.

[0037] The outermost layer of the cable is provided with a structure combining a nylon protective layer 26 and an outer sheath layer 25, which has both outer layer support and stress absorption capacity, and can provide better protection and support for the internal structure of the cable during laying. The outer sheath layer 25 is made of PTFE Teflon polytetrafluoroethylene plastic, so that the cable has a high temperature resistance level of 250 degrees and a low temperature resistance of -60 degrees, and has excellent characteristics such as high cold resistance, high temperature resistance, corrosion resistance, weather resistance, acid and alkali resistance, and environmental protection. The nylon material used in the nylon protective layer 26 has excellent characteristics such as wear resistance, cutting resistance, oil resistance, corrosion resistance, heat resistance, high hardness and high lubricity, which can resist the gnawing of rodents and termites, and the material is halogen-free and non-toxic, and is harmless to the soil and the surrounding environment when directly buried.

[0038] As a specific implementation, the contacting sides of the nylon protective layer 26 and the outer sheath layer 25 are formed with a plurality of mutually engaged mutual embedding parts 27. The nylon protective layer 26 and the outer sheath layer 25 can be structured as a whole through the mutual embedding parts 27, thereby improving the torsion resistance, support and stress absorption capacity of the outer layer structure and preventing it from breaking easily.

[0039] Furthermore, a plurality of outwardly extending steel wires 241 are braided in the circumferential direction of the outer periphery of the galvanized steel wire armor layer 24 by a braiding process. A clamping hole 251 is formed on one side of the outer sheath layer 25 for contacting the galvanized steel wire armor layer 24 for clamping the outwardly extending steel wires 241. The bottom of the clamping hole 251 extends into the mutually embedded portion 27, so that after the outwardly extending steel wires 241 are clamped into the clamping hole 251, the outwardly extending steel wires 241 and the mutually embedded portion 27 form a connected whole.

[0040] Furthermore, a plurality of outwardly extending steel wires 241 and mutually embedded parts 27 form a connected whole through which a first series-connected steel wire 28 is passed to connect the plurality of wholes in series into a braided whole. During processing, the first series-connected steel wire 28 is in a spiral shape and is passed through the inner side of the outwardly extending steel wire 241 when it is spiraled. In this way, the outer galvanized steel wire armor layer 24, the outer sheath layer 25 and the nylon protective layer 26 are connected into a whole, and a stable relative position can be maintained between the three, and the outer sheath will not be decoupled during long-term use, thereby ensuring the stability of the protection of the internal structure of the cable.

[0041] During processing, the processing positions of the outwardly extending steel wire 241 and the first series-connected steel wire 28 are first positioned, and then the outer layer of the galvanized steel wire armor layer 24 is injection molded to ensure that the outwardly extending steel wire 241 and the first series-connected steel wire 28 support the structural strength of the overall cable.

[0042] As a specific implementation, the inner circumference of the galvanized steel wire armor layer 24 is woven with a plurality of inwardly extending steel wires 242 in the circumferential direction through a weaving process. The PE sheath layer 23 is formed with an embedding hole 231 for embedding and installing the inwardly extending steel wires 242. The inwardly extending steel wires 242 are embedded and installed at the bottom of the groove of the embedding hole 231. In addition, a second series-connected steel wire 29 is also penetrated in the PE sheath layer 23. The second series-connected steel wire 29 is spirally shaped and penetrated on the inner side of the inwardly extending steel wire 242 when spirally extending. In this way, the galvanized steel wire armor layer 24 and the PE sheath layer 23 are also connected into a whole. Through such a multi-layered structural whole, it can be ensured that the cable has a stable rebound ability when receiving a strong torsional force, is not easy to deform, is not easy to be derailed in a single layer, and has a strong overall anti-pulling ability. Whether it is buried or air-framed, it has higher structural performance, does not break, and the ends are not easy to be derailed.

[0043] During processing, the processing positions of the inner expansion steel wire 242 and the second series-connected steel wire 29 are first positioned, and then the inner layer of the galvanized steel wire armor layer 24 is subjected to an injection molding process, thereby ensuring that the inner expansion steel wire 242 and the second series-connected steel wire 29 support the structural strength of the overall cable. As a specific embodiment, the two stripping ends of the new smooth aluminum sheathed low-voltage cable 10 are both provided with a clamping ring 30 for clamping the two ends of the cable. The clamping ring 30 is provided with a fixing portion 301 for fixing to the position where the cable is connected. Specifically, the fixing portion 301 can be fixed to the position where the cable is connected by a screw, thereby improving the stability of the connection structure at the end of the cable, and further improving the safety of the cable during long-term use.

[0044] Furthermore, the clamping ring 30 is also provided with a connecting portion 302 for fixing and connecting the portions of the first series steel wire 28 and the second series steel wire 29 extending out of the cable. By fixing the ends of the first series steel wire 28 and the second series steel wire 29 extending out after the ends of the cable are stripped, the stability of the mechanical structure of the cable can be strengthened.

[0045] Specifically, the connection part 302 is formed with a self-locking rod 303 and a self-locking plug rod 304, through which the first series-connected steel wire 28 and the second series-connected steel wire 29 can be self-locked. The self-locking plug rod 304 is detachably inserted into the insertion hole formed in the connection part 302, and the self-locking plug rod 304 is arranged in parallel with the self-locking rod 303, and can be in parallel contact here to tighten the ends of the steel wires as much as possible. When fixing the end of the first series steel wire 28 or the second series steel wire 29, the first series steel wire 28 or the second series steel wire 29 is wound along the overall periphery formed by the self-locking rod 303 and the self-locking plug rod 304, and the terminal is fixed in the connecting hole at one end of the self-locking plug rod 304, and then the self-locking plug rod 304 is pulled out in the opposite direction of the spiral winding of the first series steel wire 28 or the second series steel wire 29, so that the unwound end of the first series steel wire 28 or the second series steel wire 29 is locked by the part of itself that is wound, and the self-locking plug rod 304 locks the end of the first series steel wire 28 or the second series steel wire 29 to prevent it from falling off.

[0046] As an optional solution, the connecting portion 302 can be rotatably mounted on one side of the clamping ring 30, so as to facilitate adjustment of the locking position of the end of the first series-connected steel wire 28 or the second series-connected steel wire 29.

[0047] Furthermore, the spiral directions of the first series-connected steel wire 28 and the second series-connected steel wire 29 are opposite, so that when the cable receives an external force, the inside of the cable can be balanced through the opposite spiral torsion.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A new type of smooth aluminum sheathed low-voltage cable, characterized in that: include: Water-blocking aluminum conductor; The outer periphery of the water-blocking aluminum conductor is coated with a conductor shielding layer for fastening the water-blocking aluminum conductor to shield the water-blocking aluminum conductor; The outer periphery of the conductor shielding layer is coated with a polypropylene insulation layer for insulating the conductor; The outer periphery of the polypropylene insulation layer is coated with an insulation shielding layer for protecting the polypropylene insulation layer; The outer periphery of the insulating shielding layer is provided with a first semi-conductive water-swellable tape for improving the waterproof performance; The outer periphery of the semiconducting water-swellable tape is provided with a copper wire shielding layer for electrical shielding; The outer periphery of the copper wire shielding layer is wrapped with a tightening copper tape layer for tightening the copper wire shielding layer; The outer periphery of the tightening copper tape layer is coated with a second semi-conductive water-swellable tape for waterproofing the internal metal material; The outer periphery of the second semi-conductive water-swellable tape is provided with an aluminum-plastic composite tape layer for improving the structural strength and stress absorption capacity of the cable; The outer periphery of the aluminum-plastic composite tape layer is provided with a polymer sheath layer for buffering the torsional stress of the cable; An aluminum sheath layer is disposed on the periphery of the polymer sheath layer to improve water-blocking performance; The outer periphery of the aluminum sheath layer is provided with a tape layer for further waterproofing; The outer periphery of the tape layer is provided with a PE sheath layer for protecting the internal structure of the cable; The outer periphery of the PE sheath layer is provided with a galvanized steel wire armor layer for improving the mechanical strength of the cable; The outer periphery of the galvanized steel wire armor layer is provided with an outer sheath layer for elastically supporting and protecting the galvanized steel wire armor layer; The outer periphery of the outer sheath layer is provided with a nylon protective layer for improving the dragging smoothness and support of the cable.

2. The new smooth aluminum sheathed low-voltage cable according to claim 1 is characterized in that: The nylon protective layer and the outer sheath layer are both formed with a plurality of mutually engaged embedded parts on the sides that contact each other; The outer periphery of the galvanized steel wire armor layer is woven with a plurality of outwardly extending steel wires in the circumferential direction by a weaving process; A clamping hole for clamping the outwardly extending steel wire is formed on one side of the outer sheath layer for contacting the galvanized steel wire armor layer; The groove bottom of the clamping hole extends into the mutually embedded part, so that the outward expansion wire and the mutually embedded part form a connected whole.

3. The new smooth aluminum sheathed low-voltage cable according to claim 2 is characterized in that: A plurality of said outwardly extending steel wires and said mutually embedded parts form a connected whole, through which a first connecting steel wire is passed for connecting the plurality of wholes in series into a braided whole; The first series-connected steel wire is in a spiral shape, and is passed through the inner side of the outward expansion steel wire when in the spiral shape.

4. The new smooth aluminum sheathed low-voltage cable according to claim 3 is characterized in that: The inner circumference of the galvanized steel wire armor layer is woven with a plurality of inwardly spread steel wires in the circumferential direction by a weaving process; The PE sheath layer is formed with an embedding hole for the inner expansion wire to be embedded and installed; The inwardly extending steel wire is embedded and installed in the groove bottom of the embedding hole.

5. The new smooth aluminum sheathed low-voltage cable according to claim 4 is characterized in that: A second series steel wire is inserted into the PE sheath layer; The second series-connected steel wire is in a spiral shape, and is passed through the inner side of the inner-spreading steel wire when in the spiral shape.

6. The new smooth aluminum sheathed low-voltage cable according to claim 5 is characterized in that: Both stripping ends of the novel smooth aluminum sheathed low-voltage cable are sleeved with compression rings for compressing the two ends of the cable; The clamping ring is provided with a fixing portion for fixing to a position where the cable is connected.

7. The new smooth aluminum sheathed low-voltage cable according to claim 6 is characterized in that: The clamping ring is also provided with a connecting portion for fixedly connecting the portions of the first series-connected steel wire and the second series-connected steel wire extending out of the cable.

8. The new smooth aluminum sheathed low-voltage cable according to claim 7 is characterized in that: The connecting portion is formed with a self-locking rod and a self-locking plug rod for self-locking the first series-connected steel wire and the second series-connected steel wire; The self-locking rod is detachably inserted into the insertion hole formed in the connecting portion and is arranged parallel to the self-locking rod; The first series-connected steel wire or the second series-connected steel wire is wound along the overall periphery of the self-locking rod and the self-locking plug rod, and the terminal end is fixed in the connecting hole at one end of the self-locking plug rod; Pulling out the self-locking rod in a direction opposite to the spiral winding of the first series-connected steel wire or the second series-connected steel wire; The end of the first series-connected steel wire or the second series-connected steel wire is locked by the part wound around itself, and the self-locking plug rod locks the end of the first series-connected steel wire or the second series-connected steel wire to prevent it from falling off.

9. The new smooth aluminum sheathed low-voltage cable according to claim 8 is characterized in that: The spiral directions of the first series-connected steel wire and the second series-connected steel wire are opposite.

10. The new smooth aluminum sheathed low-voltage cable according to claim 1 is characterized in that: The inner side of the tightening copper tape layer is formed with a clamping foot for grasping the copper wires of the copper wire shielding layer; The copper tape used to bind the copper tape layer is a mesh structure with high mechanical ductility.

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