CN112885521A - Radial moisture-proof cable and preparation method thereof - Google Patents

Radial moisture-proof cable and preparation method thereof Download PDF

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Publication number
CN112885521A
CN112885521A CN202110288062.7A CN202110288062A CN112885521A CN 112885521 A CN112885521 A CN 112885521A CN 202110288062 A CN202110288062 A CN 202110288062A CN 112885521 A CN112885521 A CN 112885521A
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China
Prior art keywords
moisture
layer
moisture absorption
cable
proof
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CN202110288062.7A
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Chinese (zh)
Inventor
杨启顺
贺治江
严康
康春梅
覃龙
唐欣
陈霞
杨鹤
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Tbea Deyang Cable Stock Co ltd
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Tbea Deyang Cable Stock Co ltd
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Priority to CN202110288062.7A priority Critical patent/CN112885521A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
    • H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
    • H01B13/245—Sheathing; Armouring; Screening; Applying other protective layers by extrusion of metal layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/32—Filling or coating with impervious material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Abstract

The invention discloses a radial moisture-proof cable and a preparation method thereof. The moisture-proof cable comprises a cable core, wherein a moisture absorption layer, an inner moisture-proof layer and an outer moisture-proof layer are sequentially coated outside the cable core; the moisture absorption layer mainly comprises a moisture absorption shaping frame, a moisture absorption filler and a moisture absorption paper wrapping layer; the inner moisture-proof layer mainly comprises an aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer and a polyethylene plastic layer cladding the aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer; the outer moisture-proof layer mainly comprises a moisture-proof layer and a sheath layer, and the moisture-proof layer mainly comprises a modified asphalt waterproof coating and a waterproof coiled material wrapping layer. The radial echeloned compact cooperative moisture absorption layer, the inner moisture-proof layer and the outer moisture-proof layer formed outside the cable core can be excellent in water resistance and moisture resistance, long in service life, safe and reliable no matter in the cable laying and installation process or the subsequent service process.

Description

Radial moisture-proof cable and preparation method thereof
Technical Field
The invention relates to a cable, in particular to a radial moisture-proof cable and a preparation method thereof.
Background
A cable is a transmission device consisting of a conductor and a protective structure layer covering the conductor and used for transmitting electric energy or signals. When moisture penetrates inside the cable, a water tree is formed inside the cable, which can puncture the protective structural layer. In order to prevent the water tree formed by the water penetrating into the cable from damaging the structure of the protective structure layer based on the particularity of the cable, in recent years, the buried cable is required to have waterproof and moistureproof functions, which is most prominent particularly for the cable buried under the coastal region.
The common waterproof cable is mainly characterized in that a water-blocking material is filled in an insulated wire core twisting gap of a cable core and/or a layer of water-blocking tape is wrapped outside the cable core. The waterproof cable has general waterproof and moistureproof effects, and is difficult to prevent moisture from permeating into the cable for a long time in a humid environment, so that the cable is short in service life and has potential safety hazards.
Chinese patent literature discloses a technology entitled "an ethylene propylene rubber insulation and waterproofing power cable" (publication No. CN 206293172, published 2017, 06 and 30), which forms a three-layer waterproof and moistureproof structure of an inner waterproof layer, an outer waterproof layer and a water-blocking layer outside a cable core, and has an outstanding waterproof and moistureproof effect compared with a conventional waterproof cable. However, the forming structure of the inner waterproof layer, the outer waterproof layer and the waterproof layer of the technology is mainly characterized by longitudinal waterproof, the radial waterproof and moistureproof structure is not compact enough, radial waterproof and moistureproof are difficult to reliably carry out in a humid working condition environment, and moisture is easy to radially permeate into the cable.
Disclosure of Invention
The technical purpose of the invention is as follows: in view of the defects of the prior art, the radial moisture-proof cable capable of radially compacting, waterproofing and moisture-proof in a multilayer waterproof and moisture-proof structure and the preparation method of the radial moisture-proof cable are provided.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a radial moisture-proof cable, includes the cable core, the outside of cable core has moisture absorption layer, interior dampproof course and outer dampproof course in proper order the cladding, wherein:
the moisture absorption layer mainly comprises a moisture absorption shaping frame formed outside the cable core, moisture absorption filler attached to the outside of the moisture absorption shaping frame, and a moisture absorption paper wrapping layer wrapping the moisture absorption filler; a plurality of convex teeth are arranged on the periphery of the moisture absorption shaping frame, and concave attachment spaces capable of filling the moisture absorption fillers are formed between adjacent convex teeth;
the inner moisture-proof layer mainly comprises an aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer coated outside the moisture absorption layer and a polyethylene plastic layer coated outside the aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer;
the outer moisture-proof layer mainly comprises a moisture-proof layer coated outside the inner moisture-proof layer and a sheath layer coated outside the moisture-proof layer, and the moisture-proof layer mainly comprises a modified asphalt waterproof coating coated outside the inner moisture-proof layer and a waterproof coiled material coated outside the modified asphalt waterproof coating.
Above-mentioned technical measure forms the cooperation of radial echelonment in the outside of cable core specific moisture absorption layer, dampproof course and specific outer dampproof course in specific, and they cooperate at the echelonment that footpath is fine and close to reach excellent waterproof, dampproofing technological effect, can carry out radial waterproof, dampproofing reliably when being in service in moist operating mode environment, the inside of cable is difficult for radially permeating to moisture specifically:
the outer moisture-proof layer is used as a first 'echelon' of a moisture-proof function of the cable, and the sheath layer is wear-resistant, collision-resistant, water-resistant and erosion-resistant, and simultaneously is resistant to sunshine and insect pests and is not easy to damage, so that the adaptability and safety of the formed cable in a complex working condition environment are improved; the moisture-proof layer is formed by compounding a waterproof coiled material wrapping layer and a modified asphalt waterproof coating, the composite structure is stable and compact, the overall waterproof effect is excellent, and the corrosion and the permeation of water in the service working condition environment to the interior of the cable core can be effectively prevented;
the inner moisture-proof layer is used as a second 'echelon' of the moisture-proof function of the cable and is formed by compounding an aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer and a polyethylene plastic layer, the polyethylene plastic layer and the aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer form stable and compact combination, the radial or longitudinal waterproof and moisture-proof structure is compact, the waterproof effect of the outer moisture-proof layer is reliably strengthened and supplemented, and the effect of blocking moisture and humidity is reliably exerted, namely the moisture and humidity are prevented from permeating and spreading inwards;
the moisture absorption layer is used as a third 'echelon' of the moisture-proof function of the cable, the moisture absorption layer is protected outside the cable core by a moisture absorption shaping frame and forms stable partition positioning for the filled moisture absorption filler in cooperation with the moisture absorption paper wrapping layer, the moisture absorption filler distributed around the cable cannot generate the technical problem of surrounding position arrangement in the cable forming process and the subsequent service process, the moisture absorption filler filling process is convenient, easy, fully filled and convenient to form, the moisture absorption filler filled around the cable forms reliable reinforced supplement for the moisture-proof effect of the moisture-proof layer in cooperation with the corresponding moisture absorption paper wrapping layer, the moisture and moisture which possibly remain and permeate are reliably absorbed, the long-term maintenance of the dry environment in the cable is ensured, and the moisture absorption effect around the cable is basically balanced so as to reliably prevent the moisture from further permeating and spreading into the cable core.
As one of the preferred scheme, a plurality of moisture absorption pinholes with the aperture less than or equal to 1mm are arranged in the concave attachment space formed between the adjacent convex teeth of the moisture absorption shaping frame, and each moisture absorption pinhole is communicated with the inner side surface of the moisture absorption shaping frame and the surface of the concave attachment space. This technical measure is based on the above-mentioned hinder but moisture absorption technological effect to the inside erosion and permeation in-process of cable core of the moisture of external environment, under the prerequisite that does not influence the moisture absorption filler design stability of packing between adjacent dogtooth, forms the outer row moisture absorption effect to the outside suction of the moisture of internal environment, forms the moisture absorption passageway that can aspirate the moisture that probably exists in the internal environment promptly on the moisture absorption layer, and is excellent to the inside dampproofing, the drying effect of cable core.
As one of the preferable schemes, the moisture absorption filler is calcium chloride desiccant, moisture absorption silica gel or montmorillonite desiccant. The technical measures do not influence the self conductive property of the cable, can form reliable attached filling on the moisture absorption shaping frame, and can also play the technical effects of moisture absorption and environmental dryness keeping.
As one preferable scheme, a protective layer of a metal wire/metal belt wrapping structure or a metal wire weaving structure is arranged between the cable core and the moisture absorption layer. The technical measure forms good shielding and armor protection technical effects outside the cable core, and effectively enhances the physical and mechanical properties and the electrical properties of the formed cable by matching with the moisture absorption layer, and is also beneficial to the compaction of the cable core structure.
As one of the preferable schemes, the cable core mainly comprises a wire core and an expansion type water-blocking material filling layer wrapping the wire core, wherein the expansion type water-blocking material filling layer is water-blocking yarn, water-blocking tape or water-blocking compound. According to the technical measure, a fourth echelon is formed for the moisture-proof function of the cable through the expansion type water-blocking material filling layer, so that moisture and moisture which possibly permeate can be reliably absorbed and blocked in the radial direction and the longitudinal direction, the insulated wire core is prevented from being corroded by damp or punctured by water trees, and the moisture-proof technical effect is strengthened.
Furthermore, the wire core of the cable core is in a single-wire arrangement structure or a multi-wire stranding structure;
the wire core of the single arrangement structure is composed of an insulating wire core, and the insulating wire core is mainly composed of a conductor and an insulating layer coated outside the conductor;
the cable cores of the multiple stranded structures are formed by stranding multiple insulating cable cores, and each insulating cable core mainly comprises a conductor, and a conductor shielding layer, an insulating shielding layer and a split-phase shielding layer which sequentially wrap the conductor from inside to outside.
A preparation method of the radial moisture-proof cable comprises the following process steps:
step 1, manufacturing a cable core;
step 2, extruding and coating a moisture absorption shaping frame with a plurality of convex teeth on the periphery outside the cable core;
cooling and drying the moisture absorption shaping frame;
step 3, filling moisture absorption filler in an inwards concave attachment space formed between adjacent convex teeth of the moisture absorption shaping frame, wrapping the periphery of the moisture absorption shaping frame filled with the moisture absorption filler by using moisture absorption paper in the process, and attaching the moisture absorption filler to the periphery of the moisture absorption shaping frame by wrapping the moisture absorption paper;
step 4, longitudinally wrapping the moisture absorption paper wrapping layer with an aluminum-plastic composite tape, so that the aluminum-plastic composite tape forms a longitudinally wrapped overlapping region on the exterior of the moisture absorption paper wrapping layer, and performing seamless welding treatment on the longitudinally wrapped overlapping region of the aluminum-plastic composite tape;
or, extruding an aluminum sheath outside the moisture absorption paper wrapping layer, and drying and removing moisture on the surface of the aluminum sheath extrusion layer;
step 5, extruding and coating a polyethylene plastic layer on the outer part of the aluminum-plastic composite belt longitudinal cladding/aluminum sheath extrusion cladding;
step 6, spraying a modified asphalt waterproof material on the outer part of the polyethylene plastic layer, wherein the spraying thickness is more than or equal to 0.5 mm;
cooling and solidifying the modified asphalt waterproof coating;
step 7, impregnating asphalt or polymer waterproof materials on the waterproof coiled material, and lapping the waterproof coiled material impregnated with the waterproof materials on the outer part of the modified asphalt waterproof coating in an overlapping lapping mode;
baking the wrapped waterproof coiled material to enable the overlapped areas of the wrapping layers of the waterproof coiled material to be fused together and have no gap;
cooling and drying the waterproof coiled material wrapping layer;
and 8, extruding a sheath layer outside the waterproof coiled material wrapping layer.
The technical measures are simple, feasible and convenient to form aiming at the structural particularity of the radial moisture-proof cable, the formed moisture absorption layer, the inner moisture-proof layer and the outer moisture-proof layer are compact, stable and reliable in structure, and the waterproof and moisture-proof technical effects of radial gradient cooperation can be fully exerted, so that the formed cable achieves excellent waterproof and moisture-proof technical effects, is suitable for being used in a humid working condition environment and is stable and long-acting in service.
Preferably, the cable core in step 1 is manufactured by manufacturing the insulated wire core, and then coating and/or filling the expanded water-blocking material on the outside of the insulated wire core.
As one preferable scheme, before the moisture-absorbing shaping frame in the step 2 is cooled, a plurality of moisture-absorbing pinholes are rolled in an inwards concave attachment space formed between adjacent convex teeth, the aperture of each moisture-absorbing pinhole is less than or equal to 1mm, and the moisture-absorbing pinholes are communicated with the inner side surface of the moisture-absorbing shaping frame. This technical measure can make the moisture absorption pinhole convenient, high-efficient, stable shaping in the corresponding position department of moisture absorption design frame, and the moisture absorption passageway that probably exists in the fashioned moisture absorption pinhole formation can be pumped internal environment.
As one of the preferable schemes, before the moisture absorption shaping frame in the step 2 is extruded, a protective layer is wrapped outside the cable core by adopting a metal wire/metal belt;
or, before the moisture absorption shaping frame in the step 2 is extruded, a metal wire is adopted to weave a protective layer on the outer part of the cable core.
Preferably, the seamless welding treatment of the longitudinal covering overlapping area of the aluminum-plastic composite belt in the step 4 is to perform seamless welding on the longitudinal covering overlapping area of the aluminum-plastic composite belt by using a high-temperature welding gun with the welding strength of more than or equal to 0.5N/mm. The technical measure aims at the particularity of the longitudinal wrapping structure of the aluminum-plastic composite belt, and the seamless welding of the longitudinal wrapping overlapping area of the aluminum-plastic composite belt can be efficiently and stably realized.
As one of the preferable schemes, the spraying of the modified asphalt waterproof material in the step 6 is carried out in a repeated mode, and the thickness of the modified asphalt waterproof coating formed by multiple spraying is 1-1.5 mm. The technical measure can form a uniform and compact modified asphalt waterproof coating so as to ensure the forming quality of the moisture barrier.
The invention has the beneficial technical effects that the moisture absorption layer, the inner moisture-proof layer and the outer moisture-proof layer which are in radial echelonment cooperation are formed outside the cable core by the technical measures and are in radial echelonment cooperation in a radial direction, so that the excellent waterproof and moisture-proof technical effect is achieved, radial waterproof and moisture-proof can be reliably carried out when the cable is in service in a humid working condition environment, moisture is not easy to penetrate into the cable in a radial direction, and particularly:
the outer moisture-proof layer is used as a first 'echelon' of a moisture-proof function of the cable, and the sheath layer is wear-resistant, collision-resistant, water-resistant and erosion-resistant, and simultaneously is resistant to sunshine and insect pests and is not easy to damage, so that the adaptability and safety of the formed cable in a complex working condition environment are improved; the moisture-proof layer is formed by compounding a waterproof coiled material wrapping layer and a modified asphalt waterproof coating, the composite structure is stable and compact, the overall waterproof effect is excellent, and the corrosion and the permeation of water in the service working condition environment to the interior of the cable core can be effectively prevented;
the inner moisture-proof layer is used as a second 'echelon' of the moisture-proof function of the cable and is formed by compounding an aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer and a polyethylene plastic layer, the polyethylene plastic layer and the aluminum-plastic composite belt longitudinal cladding layer/aluminum sheath extrusion cladding layer form stable and compact combination, the radial or longitudinal waterproof and moisture-proof structure is compact, the waterproof effect of the outer moisture-proof layer is reliably strengthened and supplemented, and the effect of blocking moisture and humidity is reliably exerted, namely the moisture and humidity are prevented from permeating and spreading inwards;
the moisture absorption layer is used as a third 'echelon' of the moisture-proof function of the cable, the moisture absorption layer is protected outside the cable core by a moisture absorption shaping frame and forms stable partition positioning for the filled moisture absorption filler in cooperation with the moisture absorption paper wrapping layer, the moisture absorption filler distributed around the cable does not have the technical problem of surrounding position arrangement in the cable forming process and the subsequent service process, the moisture absorption filler filling process is convenient, easy, fully filled and convenient to form, the moisture absorption filler filled around the cable forms reliable reinforced supplement for the moisture-proof effect of the moisture-proof layer in cooperation with the corresponding moisture absorption paper wrapping layer, the moisture and moisture which are possibly remained and infiltrated are reliably absorbed, the long-term maintenance of the dry environment in the cable is ensured, and the moisture absorption effect around the cable is basically balanced so as to reliably prevent the moisture from further permeating and spreading into the cable core;
the expansion type water-blocking material filling layer is used as a fourth echelon of the cable moisture-proof function, which further forms reliable radial and longitudinal absorption and blocking to the moisture possibly permeating into the residual moisture, prevents the insulated wire core from being corroded by moisture or water tree puncture, and strengthens the technical effect of moisture-proof.
In summary, the radial echelonment cooperation of the expansion type water blocking material filling layer, the moisture absorption layer, the inner moisture-proof layer and the outer moisture-proof layer formed outside and inside the cable core is compact in radial echelonment cooperation, and the expansion type water blocking material filling layer, the moisture absorption layer, the inner moisture-proof layer and the outer moisture-proof layer can be excellent in water resistance and moisture resistance, long in service life and safe and reliable in the cable laying and installation process and the subsequent service process.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Fig. 2 is another schematic structural diagram of the present invention.
Fig. 3 is a schematic structural view of the moisture absorption and shaping frame applied in fig. 1 and 2.
The reference numbers in the figures mean: 1-cable core; 101-an insulated wire core; 1011-a conductor; 1012-conductor shield layer; 1013-an insulating layer; 1014-an insulating shielding layer; 1015-split phase shielding layer; 102-an intumescent water blocking material filling layer; 2-a protective layer; 3-moisture absorption layer; 301-moisture absorption shaping frame; 3011-moisture absorbing pinhole; 3012-convex teeth; 302-moisture absorbing filler; 303-moisture absorption paper wrapping layer; 4-inner moisture barrier; 5-outer moisture barrier; 501, moisture barrier layer; 502-sheath layer.
Detailed Description
The present invention relates to a cable, which may be a medium-low voltage power cable of 35kV or less, and may be a control cable or a computer instrument cable, and the main technical contents of the present invention will be described in detail below with reference to a plurality of embodiments. In the embodiment 1, the technical scheme content of the invention is clearly and specifically explained in conjunction with the attached drawings of the specification, namely, fig. 1 and fig. 3; embodiment 3, the technical contents of the present invention are clearly and specifically explained in conjunction with the drawings of the specification, i.e. fig. 2 and 3; in other embodiments, although not separately illustrated, the main structure of the embodiment may refer to the drawings of embodiment 1 or embodiment 3.
It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.
Example 1
Referring to fig. 1 and 3, the radial moisture-proof cable of the invention comprises a cable core 1, and a protective layer 2, a moisture absorption layer 3, an inner moisture-proof layer 4 and an outer moisture-proof layer 5 which are sequentially coated outside the cable core 1 from inside to outside.
The cable core 1 has three insulated wire cores 101. Each insulated wire core 101 mainly comprises a conductor 1011, and a conductor shielding layer 1012, an insulating layer 1013, an insulated shielding layer 1014 and a split-phase shielding layer 1015 which are sequentially coated outside the conductor 1011 from inside to outside. The conductor 1011 is a copper stranded wire structure (may also be an aluminum stranded wire structure or an aluminum alloy stranded wire structure). Conductor shield 1012 is an extruded layer structure of a semiconducting compound. The insulating layer 1013 is an extruded layer structure of rubber material (or plastic). The insulation shield 1014 is an extrusion coating of a semiconducting compound. The split-phase shielding layer 1015 is a copper strip lapping (or copper wire sparse winding/weaving) layer structure.
Three insulated wire cores 101 of the cable core 1 are twisted together, and an intumescent water blocking material filling layer 102 of water blocking yarns (or water blocking tapes or water blocking compounds) is filled in the twisting gaps of the three insulated wire cores. That is, the cable core 1 is mainly composed of three insulated wire cores 101 twisted together and an expanded water blocking material filling layer 102 covering these insulated wire cores 101.
The protective layer 2 is a metal wire (or metal belt) wrapping layer structure wrapped outside the cable core 1. Of course, a braided wire structure may be used for molding.
The moisture absorption layer 3 mainly comprises a moisture absorption shaping frame 301, a moisture absorption filler 302 and a moisture absorption paper wrapping layer 303.
The moisture-absorbing shaping frame 301 is a structure formed by extruding plastic outside the protective layer 2, and on one hand, the physical and mechanical strength of the formed cable is improved, and on the other hand, the filling position of the moisture-absorbing filler 302 is shaped. A plurality of convex teeth 3012 are uniformly formed on the periphery of the moisture-absorbing shaping frame 301, the protruding heights of the circumference of the convex teeth 3012 are basically consistent, and an annular concave adhering space capable of filling moisture-absorbing filler 302 is formed between adjacent convex teeth 3012.
In addition, a plurality of moisture absorption pinholes 3011 are further arranged in the concave attachment space formed between the adjacent convex teeth 3012 of the moisture absorption shaping frame 301, each moisture absorption pinhole 3011 communicates the inner side surface of the moisture absorption shaping frame 301 with the surface of the concave attachment space at the corresponding position, and a moisture absorption channel capable of communicating the internal environment is formed at the corresponding position of the moisture absorption shaping frame 301. The moisture absorption pinholes 3011 on the moisture absorption shaping frame 301 may be arranged regularly or in scattered arrangement, preferably in regular arrangement, which is not only convenient for batch forming, but also beneficial for the balance and stability of moisture absorption effect. Certainly, the shaping of each moisture absorption pinhole 3011 on the moisture absorption shaping frame 301 should not affect the shaping stability of the moisture absorption filler 302 filled in the corresponding concave attachment space, and therefore, the shaping aperture of each moisture absorption pinhole 3011 is required to be not more than 1mm, i.e. not more than 1mm, for example, the aperture is shaped by 0.3mm, 0.5mm or 0.8mm, etc.
The hygroscopic filler 302 is a calcium chloride desiccant, although a hygroscopic silica gel or montmorillonite desiccant may be used instead. The moisture absorption filler 302 is filled in the attachment space formed between the adjacent convex teeth on the periphery of the moisture absorption shaping frame 301, absorbs the residual moisture in the formed cable, and ensures the drying of the environment. The circumferential filling height of the moisture absorption filler 302 in the attachment space is substantially equal to the protruding height of the convex teeth at the two sides of the attachment space, that is, the moisture absorption filler 302 is filled in the attachment space, so that the formed cable has a compact and round structure, and the moisture absorption filler 302 is not easy to shift.
The moisture absorption paper wrapping layer 303 is a wrapping layer structure of moisture absorption paper, wraps the protruding teeth of the moisture absorption setting frame 301 and the periphery of the moisture absorption filler 302 filled on the moisture absorption setting frame 301, performs limiting constraint on the moisture absorption filler 302 in the radial direction and the circumferential direction of the moisture absorption setting frame 301, and simultaneously performs moisture absorption and guarantees the drying environment by matching with the moisture absorption filler 302.
The inner moisture-proof layer 4 is mainly formed by compounding an aluminum-plastic composite belt longitudinal cladding layer coated outside the moisture absorption layer 3 and a polyethylene plastic layer extruded outside the aluminum-plastic composite belt longitudinal cladding layer, and has a compact waterproof and moisture-proof structure.
The outer moisture-proof layer 5 mainly comprises a moisture-proof layer 501 wrapped outside the inner moisture-proof layer 4 and a sheath layer 502 extruded outside the moisture-proof layer 501. Wherein, the moisture barrier 501 is the compact composite bed structure of waterproof construction, and it is mainly formed by spraying the modified asphalt waterproof coating of cladding in interior dampproof course 4 outside and around the cladding in the outside waterproofing membrane of this modified asphalt waterproof coating around the cladding complex.
The preparation method of the radial moisture-proof cable comprises the following process steps:
step 1, manufacturing a cable core 1;
the specific manufacturing process comprises the following technological measures:
drawing a copper rod (or an aluminum rod or an aluminum alloy rod) into a single wire with the design requirement corresponding to the specification of the formed cable;
step two, stranding a plurality of single wires with corresponding specifications to form a conductor 1011 with a cross section meeting the design requirement;
extruding a conductor shield layer 1012 of a semiconductive compound outside a conductor 1011;
extruding an insulating layer 1013 made of rubber material (or plastic) outside the conductor shielding layer 1012;
step five, extruding an insulation shielding layer 1014 of a semi-conductive compound outside the insulation layer 1013;
step sixthly, wrapping a split-phase shielding layer 1015 of a copper strip (or loosely wound/braided copper wire) outside the insulating shielding layer 1014;
obtaining an insulated wire core 101;
seventhly, twisting the three insulation wire cores 101 according to the twisting pitch required by the design, and filling expansion type water-blocking material filling layers 102 in the twisting gaps at the inner part and the outer periphery of the three insulation wire cores to form a cable core 1 with a compact structure;
step 2, wrapping a protective layer 2 of metal wires (or metal strips) outside the cable core 1;
or, the protective layer 2 is woven by metal wires outside the cable core 1;
step 3, extruding and coating the moisture absorption and shaping frame 301 outside the cable core 1 by adopting plastics, and uniformly forming a plurality of convex teeth 3012 on the periphery of the extruded moisture absorption and shaping frame 301 according to the design of an extrusion die, wherein the convex heights of the peripheries of the convex teeth are basically one;
before the extruded moisture-absorbing shaping frame 301 is cooled, a plurality of moisture-absorbing pinholes 3011 are rolled in an inwards concave attachment space formed between every two adjacent convex teeth 3012, the aperture of each moisture-absorbing pinhole 3011 is required to be not more than 1mm (the specific aperture size is required to be compared with the design requirement of a cable manufactured currently), and the inside surface of the moisture-absorbing shaping frame 301 is required to be communicated; the communication of each moisture absorption pinhole 3011 to the inside surface of the moisture absorption shaping frame 301 is determined according to the contact of the rolling mold to the protective layer 2, or the length of the rolling mold is directly designed to be corresponding to the extrusion thickness of the current moisture absorption shaping frame 301;
cooling and drying the moisture absorption shaping frame 301 with the moisture absorption pinhole 3011;
step 4, filling moisture absorption filler 302 in an inwards concave space formed between adjacent convex teeth of the moisture absorption shaping frame 301, wherein when the specific filling requirement is met, the circumferential height of the moisture absorption filler 302 does not exceed the protruding height of the convex teeth on two sides of the space, but the space is filled;
in the filling process, wrapping and bundling the periphery of the moisture absorption shaping frame 301 filled with the moisture absorption filler 302 by using moisture absorption paper, enabling the moisture absorption filler 302 to be stably attached to the periphery of the moisture absorption shaping frame 301 by wrapping the moisture absorption paper, preventing the moisture absorption filler 302 from falling off from an attachment space of the moisture absorption shaping frame 301, and forming a moisture absorption paper wrapping layer 303 on the peripheries of the moisture absorption shaping frame 301 and the moisture absorption filler 302 by the wrapped moisture absorption paper;
step 5, longitudinally wrapping the aluminum-plastic composite tape outside the moisture absorption paper wrapping layer 303 to form a longitudinal wrapping overlapping area on the aluminum-plastic composite tape outside the moisture absorption paper wrapping layer 303, and performing seamless welding on the longitudinal wrapping overlapping area of the aluminum-plastic composite tape by using a high-temperature welding gun with the welding strength of more than or equal to 0.5N/mm (such as 0.5N/mm or 0.8N/mm) to form a longitudinal wrapping layer structure of the aluminum-plastic composite tape with a seamless welding structure;
step 6, extruding and coating a polyethylene plastic layer outside the longitudinal cladding layer of the aluminum-plastic composite belt;
the inner moisture-proof layer 4 with a composite structure is formed through the step 5 and the step, and the longitudinal wrapping of the aluminum-plastic composite belt and the extrusion wrapping of the polyethylene plastic layer are preferably continuously completed in the same process, so that the inner moisture-proof layer 4 formed by compounding is more stable and compact in structure;
step 7, uniformly spraying the modified asphalt waterproof material on the outer part of the polyethylene plastic layer by using a paint spraying gun, wherein the spraying process is to repeatedly spray the modified asphalt waterproof material on the outer part of the polyethylene plastic layer for three times, the spraying thickness of each time is about 0.5mm, so that a uniform and compact modified asphalt waterproof coating is formed, and the thickness of the modified asphalt waterproof coating is about 1.5 mm;
placing the asphalt waterproof coating in a natural environment for 2-4 hours to ensure that the modified asphalt waterproof coating is cooled and solidified;
step 8, dipping asphalt (or other high polymer waterproof materials, preferably asphalt) on the waterproof coiled material;
wrapping the waterproof coiled material impregnated with the waterproof material outside the modified asphalt waterproof coating in an overlapping wrapping mode;
baking the wrapped waterproof coiled material by adopting a flame spray gun to enable the overlapped areas of the wrapping layer of the waterproof coiled material to be fused together without gaps;
cooling and drying the waterproof coiled material wrapping layer;
forming a moisture barrier 501 of a composite structure through step 7 and this step;
and 9, extruding a sheath layer 502 made of rubber materials (or plastics) outside the waterproof coiled material wrapping layer.
Example 2
The radial moisture-proof cable comprises a cable core, and a protective layer, a moisture absorption layer, an inner moisture-proof layer and an outer moisture-proof layer which are sequentially coated outside the cable core from inside to outside.
The cable core is provided with three insulation wire cores. Each insulated wire core mainly comprises a conductor, and an insulating layer and a split-phase shielding layer which are sequentially coated outside the conductor from inside to outside. The conductor is in a copper stranded wire structure (also can be in an aluminum stranded wire structure or an aluminum alloy stranded wire structure). The insulating layer is an extruded layer structure made of rubber materials (or plastics). The split-phase shielding layer is in a copper strip lapping (or copper wire sparse winding/weaving) layer structure.
Three insulated wire cores of the cable core are twisted together, and an expansion type water-blocking material filling layer of water-blocking yarns (or water-blocking tapes or water-blocking compounds) is filled in the twisting gaps of the three insulated wire cores. That is to say, the cable core mainly comprises three twisted insulated wire cores and an expansion type water blocking material filling layer coating the insulated wire cores.
The protective layer is a metal wire (or metal belt) wrapping layer structure wrapping the outside of the cable core. Of course, a braided wire structure may be used for molding.
The moisture absorption layer mainly comprises a moisture absorption shaping frame, moisture absorption filler and a moisture absorption paper wrapping layer.
The moisture absorption shaping frame is a structure formed by extruding and molding plastics outside the protective layer, so that the physical and mechanical strength of the formed cable is improved on one hand, and the filling position of the moisture absorption filler is shaped on the other hand. The periphery of the moisture absorption shaping frame is uniformly formed with a plurality of convex teeth, the circumferential convex heights of the convex teeth are basically consistent, and an attachment space which is annularly inwards concave and can be used for filling moisture absorption filler is formed between the adjacent convex teeth.
In addition, a plurality of moisture absorption pinholes are further arranged in an inwards concave attachment space formed between adjacent convex teeth of the moisture absorption shaping frame, each moisture absorption pinhole enables the inner side surface of the moisture absorption shaping frame to be communicated with the surface of the inwards concave attachment space at the position, and a moisture absorption channel capable of communicating the internal environment is formed at the corresponding position of the moisture absorption shaping frame. The moisture absorption pinholes on the moisture absorption shaping frame can be regularly arranged or scattered arranged, preferably regularly arranged, so that the moisture absorption shaping frame is convenient for batch forming and is beneficial to the balance and stability of moisture absorption effect. Certainly, the shaping of each moisture absorption pinhole on the moisture absorption shaping frame should not affect the shaping stability of the moisture absorption filler filled in the corresponding concave attachment space, and therefore, the shaping aperture of each moisture absorption pinhole is required to be not more than 1mm, i.e. not more than 1mm, for example, the aperture is shaped by 0.3mm, 0.5mm or 0.8mm, etc.
The moisture absorption filler is calcium chloride desiccant, but of course, moisture absorption silica gel or montmorillonite desiccant can be used instead. The moisture absorption filler is filled in an attachment space formed between adjacent convex teeth on the periphery of the moisture absorption shaping frame, residual moisture and humidity are absorbed in the formed cable, and the environment drying is guaranteed. The annular filling height of the moisture absorption filler in the attachment space is basically consistent with the protruding height of the convex teeth on the two sides of the attachment space, namely, the moisture absorption filler is filled in the attachment space, so that the formed cable is compact and round in structure, and the moisture absorption filler is not easy to shift.
The moisture absorption paper is around the package structure of covering for moisture absorption paper, and it is around the periphery that loads the moisture absorption filler on the dogtooth of wrapping in the moisture absorption stock frame and the moisture absorption stock frame, will absorb moisture the filler and carry out spacing restraint radially and upwards circumferentially of moisture absorption stock frame, and the cooperation is absorbed the filler and is carried out moisture absorption and guarantee the dry environment simultaneously.
The inner moisture-proof layer is mainly formed by compounding an aluminum sheath extrusion layer extruded outside the moisture absorption layer and a polyethylene plastic layer extruded outside the aluminum sheath extrusion layer, and the inner moisture-proof layer is compact in waterproof and moisture-proof structure.
The outer moisture-proof layer mainly comprises a moisture-proof layer coated outside the inner moisture-proof layer and a sheath layer extruded outside the moisture-proof layer. Wherein, the moisture barrier is the compact composite construction of waterproof construction, and it is mainly formed by spraying cladding in the outside modified asphalt waterproof coating of interior moisture barrier and around the covering complex of the waterproofing membrane of wrapping in the outside of this modified asphalt waterproof coating.
The preparation method of the radial moisture-proof cable comprises the following process steps:
step 1, manufacturing a cable core;
the specific manufacturing process comprises the following technological measures:
drawing a copper rod (or an aluminum rod or an aluminum alloy rod) into a single wire with the design requirement corresponding to the specification of the formed cable;
stranding a plurality of single wires with corresponding specifications to form a conductor with a section meeting the design requirement;
extruding an insulating layer made of rubber materials (or plastics) outside the conductor;
lapping a split-phase shielding layer of a copper belt (or a loosely wound/woven copper wire) on the outside of the insulating layer;
obtaining an insulated wire core;
twisting the three insulated wire cores according to the twisting pitch required by the design, and filling an expansion type water-blocking material filling layer in the twisting gaps inside and outside the three insulated wire cores to form a cable core with a compact structure;
step 2, wrapping a protective layer of metal wires (or metal strips) outside the cable core;
or, weaving a protective layer with metal wires outside the cable core;
step 3, extruding and coating the moisture absorption and shaping frame outside the protective layer by using plastic, and uniformly forming a plurality of convex teeth on the periphery of the extruded moisture absorption and shaping frame according to the design of an extrusion die, wherein the heights of the convex teeth on the periphery are basically one;
before the extruded moisture-absorbing shaping frame is cooled, rolling a plurality of moisture-absorbing pinholes in an inwards concave attachment space formed between every two adjacent convex teeth, wherein the aperture of each moisture-absorbing pinhole is required to be not more than 1mm (the specific aperture size is required to be in accordance with the design requirement of a cable manufactured at present), and the inner side surface of the moisture-absorbing shaping frame is required to be communicated; the communication of each moisture absorption pinhole to the inner side surface of the moisture absorption shaping frame is taken as a judgment basis according to the contact of the rolling mold to the protective layer, or the length of the rolling mold is directly designed to be the extrusion thickness corresponding to the current moisture absorption shaping frame;
cooling and drying the moisture absorption shaping frame with the moisture absorption pinholes;
step 4, filling moisture absorption filler in an inwards concave space formed between adjacent convex teeth of the moisture absorption shaping frame, wherein when the specific filling requirement is met, the circumferential height of the moisture absorption filler does not exceed the convex height of the convex teeth on two sides of the space, but the space is filled;
in the filling process, wrapping and bundling the periphery of the moisture absorption shaping frame filled with the moisture absorption filler by using moisture absorption paper, enabling the moisture absorption filler to be stably attached to the periphery of the moisture absorption shaping frame by wrapping the moisture absorption paper, preventing the moisture absorption filler from falling off from an attachment space of the moisture absorption shaping frame, and forming a moisture absorption paper wrapping layer on the wrapped moisture absorption paper at the peripheries of the moisture absorption shaping frame and the moisture absorption filler;
step 5, an aluminum extruder is adopted to extrude and wrap the aluminum sheath extrusion layer on the outer part of the moisture absorption paper winding layer;
removing water on the surface of the aluminum sheath extruded layer by using a dryer to ensure drying;
step 6, extruding a polyethylene plastic layer outside the aluminum sheath extrusion layer;
forming an inner moisture barrier of the composite structure by step 5 and this step;
step 7, uniformly spraying the modified asphalt waterproof material on the outer part of the polyethylene plastic layer by using a paint spraying gun, wherein the spraying process is to repeatedly spray the modified asphalt waterproof material on the outer part of the polyethylene plastic layer for three times, the spraying thickness of each time is about 0.3mm, so that a uniform and compact modified asphalt waterproof coating is formed, and the thickness of the modified asphalt waterproof coating is about 1 mm;
placing the asphalt waterproof coating in a natural environment for 2-4 hours to ensure that the modified asphalt waterproof coating is cooled and solidified;
step 8, dipping asphalt (or other high polymer waterproof materials, preferably asphalt) on the waterproof coiled material;
wrapping the waterproof coiled material impregnated with the waterproof material outside the modified asphalt waterproof coating in an overlapping wrapping mode;
baking the wrapped waterproof coiled material by adopting a flame spray gun to enable the overlapped areas of the wrapping layer of the waterproof coiled material to be fused together without gaps;
cooling and drying the waterproof coiled material wrapping layer;
forming a moisture barrier layer of the composite structure through step 7 and this step;
and 9, extruding a rubber material (or plastic) sheath layer outside the waterproof coiled material wrapping layer.
Example 3
Referring to fig. 2 and 3, the radial moisture-proof cable of the invention comprises a cable core 1, and a protective layer 2, a moisture absorption layer 3, an inner moisture-proof layer 4 and an outer moisture-proof layer 5 which are sequentially coated outside the cable core 1 from inside to outside.
The cable core 1 has an insulated wire core 101. The insulated wire core 101 is mainly composed of a conductor 1011 and an insulating layer 1013 covering the conductor 1011. The conductor 1011 is a copper stranded wire structure (or an aluminum stranded wire structure or an aluminum alloy stranded wire structure). The insulating layer 1013 is an extruded layer structure of rubber material (or plastic).
The insulating wire core 101 of the cable core 1 is coated with an expansion type water blocking material filling layer 102. That is, the cable core 1 is mainly composed of an insulated wire core 101 and an intumescent water blocking material filler layer 102 covering the insulated wire core 101.
The protective layer 2 is a metal wire (or metal belt) wrapping layer structure wrapped outside the cable core 1. Of course, a braided wire structure may be used for molding.
The moisture absorption layer 3 mainly comprises a moisture absorption shaping frame 301, a moisture absorption filler 302 and a moisture absorption paper wrapping layer 303.
The moisture-absorbing shaping frame 301 is a structure formed by extruding plastic outside the protective layer 2, and on one hand, the physical and mechanical strength of the formed cable is improved, and on the other hand, the filling position of the moisture-absorbing filler 302 is shaped. A plurality of convex teeth are uniformly formed on the periphery of the moisture absorption shaping frame 301, the protruding heights of the peripheries of the convex teeth are basically consistent, and an attachment space which is annularly inwards concave and can be used for filling moisture absorption filler 302 is formed between the adjacent convex teeth.
In addition, a plurality of moisture absorption pinholes 3011 are further arranged in the concave attachment space formed between the adjacent convex teeth 3012 of the moisture absorption shaping frame 301, each moisture absorption pinhole 3011 communicates the inner side surface of the moisture absorption shaping frame 301 with the surface of the concave attachment space at the corresponding position, and a moisture absorption channel capable of communicating the internal environment is formed at the corresponding position of the moisture absorption shaping frame 301. The moisture absorption pinholes 3011 on the moisture absorption shaping frame 301 may be arranged regularly or in scattered arrangement, preferably in regular arrangement, which is not only convenient for batch forming, but also beneficial for the balance and stability of moisture absorption effect. Certainly, the shaping of each moisture absorption pinhole 3011 on the moisture absorption shaping frame 301 should not affect the shaping stability of the moisture absorption filler 302 filled in the corresponding concave attachment space, and therefore, the shaping aperture of each moisture absorption pinhole 3011 is required to be not more than 1mm, i.e. not more than 1mm, for example, the aperture is shaped by 0.3mm, 0.5mm or 0.8mm, etc.
The hygroscopic filler 302 is a calcium chloride desiccant, although a hygroscopic silica gel or montmorillonite desiccant may be used instead. The moisture absorption filler 302 is filled in the attachment space formed between the adjacent convex teeth on the periphery of the moisture absorption shaping frame 301, absorbs the residual moisture in the formed cable, and ensures the drying of the environment. The annular packing height of the moisture absorption filler 302 in the attachment space is substantially equal to the protrusion height of the convex teeth at the two sides of the attachment space, that is, the moisture absorption filler 302 is filled in the attachment space, so that the formed cable has a compact and round structure, and the moisture absorption filler 302 is not easy to shift.
The moisture absorption paper wrapping layer 303 is a wrapping structure of moisture absorption paper, wraps the protruding teeth of the moisture absorption setting frame 301 and the periphery of the moisture absorption filler 302 filled in the moisture absorption setting frame 301, limits and restricts the moisture absorption filler 302 in the radial direction and the circumferential direction of the moisture absorption setting frame 301, and is matched with the moisture absorption filler 302 to absorb moisture and ensure the drying of the environment.
The inner moisture-proof layer 4 is mainly formed by compounding an aluminum-plastic composite belt longitudinal cladding layer coated outside the moisture absorption layer 3 and a polyethylene plastic layer extruded outside the aluminum-plastic composite belt longitudinal cladding layer, and has a compact waterproof and moisture-proof structure.
The outer moisture-proof layer 5 mainly comprises a moisture-proof layer 501 wrapped outside the inner moisture-proof layer 4 and a sheath layer 502 extruded outside the moisture-proof layer 501. Wherein, the moisture barrier 501 is the compact composite construction of waterproof construction, and it is mainly formed by spraying cladding in the outside modified asphalt waterproof coating of interior dampproof course 4 and around the outside waterproofing membrane of this modified asphalt waterproof coating around the covering complex.
The preparation method of the radial moisture-proof cable comprises the following process steps:
step 1, manufacturing a cable core 1;
the specific manufacturing process comprises the following technological measures:
drawing a copper rod (or an aluminum rod or an aluminum alloy rod) into a single wire with the design requirement corresponding to the specification of the formed cable;
step two, stranding a plurality of single wires with corresponding specifications to form a conductor 1011 with a cross section meeting the design requirement;
extruding an insulating layer 1013 made of rubber material (or plastic) outside the conductor 1011;
obtaining an insulated wire core 101;
on the basis of a single insulated wire core 101, coating an expansion type water-blocking material filling layer 102 on the periphery of the insulated wire core to form a cable core 1 with a compact structure;
step 2, wrapping a protective layer 2 of metal wires (or metal strips) outside the cable core 1;
or, the protective layer 2 is woven by metal wires outside the cable core 1;
step 3, extruding and coating the moisture absorption and shaping frame 301 outside the cable core 1 by adopting plastics, and uniformly forming a plurality of convex teeth 3011 on the periphery of the extruded moisture absorption and shaping frame 301 according to the design of an extrusion die, wherein the convex heights of the peripheries of the convex teeth are basically one;
before the extruded moisture-absorbing shaping frame 301 is cooled, a plurality of moisture-absorbing pinholes 3011 are rolled in an inwards concave attachment space formed between every two adjacent convex teeth 3012, the aperture of each moisture-absorbing pinhole 3011 is required to be not more than 1mm (the specific aperture size is required to be compared with the design requirement of a cable manufactured currently), and the inside surface of the moisture-absorbing shaping frame 301 is required to be communicated; the communication of each moisture absorption pinhole 3011 to the inside surface of the moisture absorption shaping frame 301 is determined according to the contact of the rolling mold to the protective layer 2, or the length of the rolling mold is directly designed to be corresponding to the extrusion thickness of the current moisture absorption shaping frame 301;
cooling and drying the moisture absorption shaping frame 301 with the moisture absorption pinhole 3011;
step 4, filling moisture absorption filler 302 in an inwards concave space formed between adjacent convex teeth of the moisture absorption shaping frame 301, wherein when the specific filling requirement is met, the circumferential height of the moisture absorption filler 302 does not exceed the protruding height of the convex teeth on two sides of the space, but the space is filled;
in the filling process, wrapping and bundling the periphery of the moisture absorption shaping frame 301 filled with the moisture absorption filler 302 by using moisture absorption paper, enabling the moisture absorption filler 302 to be stably attached to the periphery of the moisture absorption shaping frame 301 by wrapping the moisture absorption paper, preventing the moisture absorption filler 302 from falling off from an attachment space of the moisture absorption shaping frame 301, and forming a moisture absorption paper wrapping layer 303 on the peripheries of the moisture absorption shaping frame 301 and the moisture absorption filler 302 by the wrapped moisture absorption paper;
step 5, longitudinally wrapping the aluminum-plastic composite tape outside the moisture absorption paper wrapping layer 303 to form a longitudinal wrapping overlapping area on the aluminum-plastic composite tape outside the moisture absorption paper wrapping layer 303, and performing seamless welding on the longitudinal wrapping overlapping area of the aluminum-plastic composite tape by using a high-temperature welding gun with the welding strength of more than or equal to 0.5N/mm (such as 0.5N/mm or 0.8N/mm) to form a longitudinal wrapping layer structure of the aluminum-plastic composite tape with a seamless welding structure;
step 6, extruding and coating a polyethylene plastic layer outside the longitudinal cladding layer of the aluminum-plastic composite belt;
the inner moisture-proof layer 4 with a composite structure is formed through the step 5 and the step, and the longitudinal wrapping of the aluminum-plastic composite belt and the extrusion wrapping of the polyethylene plastic layer are preferably continuously completed in the same process, so that the inner moisture-proof layer 4 formed by compounding is more stable and compact in structure;
step 7, uniformly spraying the modified asphalt waterproof material on the outer part of the polyethylene plastic layer by using a paint spraying gun, wherein the spraying process is to repeatedly spray the modified asphalt waterproof material on the outer part of the polyethylene plastic layer for four times, the spraying thickness of each time is about 0.3mm, so that a uniform and compact modified asphalt waterproof coating is formed, and the thickness of the modified asphalt waterproof coating is about 1.2 mm;
placing the asphalt waterproof coating in a natural environment for 2-4 hours to ensure that the modified asphalt waterproof coating is cooled and solidified;
step 8, dipping asphalt (or other high polymer waterproof materials, preferably asphalt) on the waterproof coiled material;
wrapping the waterproof coiled material impregnated with the waterproof material outside the modified asphalt waterproof coating in an overlapping wrapping mode;
baking the wrapped waterproof coiled material by adopting a flame spray gun to enable the overlapped areas of the wrapping layer of the waterproof coiled material to be fused together without gaps;
cooling and drying the waterproof coiled material wrapping layer;
forming a moisture barrier 501 of a composite structure through step 7 and this step;
and 9, extruding a sheath layer 502 made of rubber materials (or plastics) outside the waterproof coiled material wrapping layer.
Example 4
The rest of the present embodiment is the same as embodiment 3, except that: the cable core only consists of the insulating wire core and is not provided with an expansion type water-blocking material filling layer.
Example 5
The rest of this example is the same as example 1, 2 or 3, except that: and removing the protective layer between the cable core and the moisture absorption layer or arranging the protective layer outside the outer moisture-proof layer, and the like.
Example 6
The rest of this example is the same as example 1, 2 or 3, except that: the moisture absorption shaping frame is provided with a structure without moisture absorption pinholes, so that the moisture absorption and discharge functions of the moisture absorption shaping frame to the inside environment of the moisture absorption shaping frame are correspondingly eliminated.
The above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes in the embodiments and/or equivalent changes in some features may be made without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a radial moisture-proof cable, includes cable core (1), its characterized in that, the outside of cable core (1) has wrapped in proper order and has moisture absorption layer (3), interior dampproof course (4) and outer dampproof course (5), wherein:
the moisture absorption layer (3) mainly comprises a moisture absorption shaping frame (301) formed outside the cable core (1), a moisture absorption filler (302) attached to the outside of the moisture absorption shaping frame (301), and a moisture absorption paper wrapping layer (303) wrapping the moisture absorption filler (302); a plurality of convex teeth (3012) are arranged on the periphery of the moisture absorption shaping frame (301), and concave attachment spaces capable of filling the moisture absorption filler (302) are formed between the adjacent convex teeth (3012);
-the inner moisture barrier (4) is mainly composed of a longitudinal aluminum-plastic composite tape cladding/aluminum sheath extrusion cladding coated outside the moisture absorbing layer (3), and a polyethylene plastic layer coated outside the longitudinal aluminum-plastic composite tape cladding/aluminum sheath extrusion cladding;
-the outer moisture barrier (5) is mainly composed of a moisture barrier (501) wrapped outside the inner moisture barrier (4) and a sheath (502) wrapped outside the moisture barrier (501), and the moisture barrier (501) is mainly composed of a modified asphalt waterproof coating wrapped outside the inner moisture barrier (4) and a waterproof coiled material wrapped outside the modified asphalt waterproof coating.
2. The radial moisture-proof cable as claimed in claim 1, wherein a plurality of moisture-absorbing pinholes (3011) with a pore diameter less than or equal to 1mm are arranged in an inward concave attachment space formed between adjacent teeth (3012) of the moisture-absorbing and shaping frame (301), and each moisture-absorbing pinhole (3011) connects the inner side surface of the moisture-absorbing and shaping frame (301) with the surface of the inward concave attachment space;
the moisture absorption filler (302) is a calcium chloride desiccant, a moisture absorption silica gel desiccant or a montmorillonite desiccant.
3. The radial moisture-proof cable as claimed in claim 1, characterized in that a protective layer (2) of a wire/metal tape wrapped structure or a wire braided structure is arranged between the cable core (1) and the moisture absorbing layer (3).
4. The radial moisture-proof cable according to claim 1 or 3, wherein the cable core (1) mainly comprises a wire core and an expansion type water-blocking material filling layer (102) wrapping the wire core, and the expansion type water-blocking material filling layer (102) is a water-blocking yarn, a water-blocking tape or a water-blocking compound.
5. The radial moisture-proof cable according to claim 4, wherein the core of the cable core (1) is in a single arrangement structure or a multi-stranded structure;
the wire core of the single arrangement structure is composed of an insulating wire core (101), and the insulating wire core (101) is mainly composed of a conductor (1011) and an insulating layer (1013) coated outside the conductor (1011);
the cable cores of the multiple stranded structures are formed by stranding multiple insulating cable cores (101), and each insulating cable core (101) mainly comprises a conductor (1011) and a conductor shielding layer (1012), an insulating layer (1013), an insulating shielding layer (1014) and a split-phase shielding layer (1015) which are sequentially coated from inside to outside.
6. A method of making a radial moisture resistant cable according to claim 1, comprising the steps of:
step 1, manufacturing a cable core (1);
step 2, extruding and coating a moisture absorption shaping frame (301) with a plurality of convex teeth (3012) on the periphery of the outer part of the cable core (1);
cooling and drying the moisture absorption shaping frame (301);
step 3, filling moisture absorption fillers (302) in an inwards concave attachment space formed between adjacent convex teeth (3012) of the moisture absorption shaping frame (301), wrapping the periphery of the moisture absorption shaping frame (301) filled with the moisture absorption fillers (302) by using moisture absorption paper in the process, and attaching the moisture absorption fillers (302) to the periphery of the moisture absorption shaping frame (301) by wrapping the moisture absorption paper;
step 4, longitudinally wrapping the moisture absorption paper wrapping layer (303) with an aluminum-plastic composite tape to form a longitudinal wrapping overlapping area on the exterior of the moisture absorption paper wrapping layer (303), and performing seamless welding treatment on the longitudinal wrapping overlapping area of the aluminum-plastic composite tape;
or extruding and coating an aluminum sheath outside the moisture absorption paper wrapping layer (303), and drying and removing the moisture on the surface of the aluminum sheath extrusion layer;
step 5, extruding and coating a polyethylene plastic layer on the outer part of the aluminum-plastic composite belt longitudinal cladding/aluminum sheath extrusion cladding;
step 6, spraying a modified asphalt waterproof material on the outer part of the polyethylene plastic layer, wherein the spraying thickness is more than or equal to 0.5 mm;
cooling and solidifying the modified asphalt waterproof coating;
step 7, impregnating asphalt or polymer waterproof materials on the waterproof coiled material, and lapping the waterproof coiled material impregnated with the waterproof materials on the outer part of the modified asphalt waterproof coating in an overlapping lapping mode;
baking the wrapped waterproof coiled material to enable the overlapped areas of the wrapping layers of the waterproof coiled material to be fused together and have no gap;
cooling and drying the waterproof coiled material wrapping layer;
and 8, extruding a sheath layer outside the waterproof coiled material wrapping layer.
7. The method for preparing the radial moisture-proof cable according to claim 6, wherein before cooling, the moisture-absorbing shaping frame (301) in the step 2 is rolled with a plurality of moisture-absorbing pinholes (3011) in the concave attachment space formed between the adjacent convex teeth (3012), the pore diameter of each moisture-absorbing pinhole (3011) is less than or equal to 1mm, and the moisture-absorbing shaping frame (301) is communicated with the inner side surface.
8. The preparation method of the radial moisture-proof cable according to claim 6, wherein before the moisture-absorbing shaping frame (301) in the step 2 is extruded, a protective layer (2) is wrapped outside the cable core (1) by using a metal wire/metal tape;
or before the moisture absorption shaping frame (301) in the step 2 is extruded, weaving the protective layer (2) outside the cable core (1) by adopting metal wires.
9. The method for preparing the radial moisture-proof cable according to claim 6, wherein the seamless welding treatment of the longitudinal covering overlapping area of the aluminum-plastic composite tape in the step 4 is to perform seamless welding at the longitudinal covering overlapping area of the aluminum-plastic composite tape by using a high-temperature welding gun with a welding strength of more than or equal to 0.5N/mm.
10. The preparation method of the radial moisture-proof cable according to claim 6, wherein the spraying of the modified asphalt waterproof material in the step 6 is repeated for a plurality of times, and the thickness of the modified asphalt waterproof coating formed by the spraying for a plurality of times is 1-1.5 mm.
CN202110288062.7A 2021-03-18 2021-03-18 Radial moisture-proof cable and preparation method thereof Pending CN112885521A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114864193A (en) * 2022-05-26 2022-08-05 常州八益电缆股份有限公司 Preparation method of special cable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114864193A (en) * 2022-05-26 2022-08-05 常州八益电缆股份有限公司 Preparation method of special cable
CN114864193B (en) * 2022-05-26 2024-03-26 常州八益电缆股份有限公司 Preparation method of special cable

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