CN115910452A - Design and production process of waterproof cable - Google Patents

Abstract

The invention belongs to the technical field of cable manufacturing, and discloses a design and production process of a water-blocking cable. The cable comprises a plurality of monofilaments, water-blocking tapes, water-blocking yarns and insulating layers, wherein the monofilaments comprise a central filament and peripheral filaments, the peripheral filaments are circumferentially arranged along the central filament and distributed into a plurality of layers of peripheries, one layer of periphery close to the central filament is arranged to be a first layer of periphery, each water-blocking tape comprises a first water-blocking tape, a second water-blocking tape and a third water-blocking tape, the first water-blocking tape is arranged between the outer side of the central filament and the first layer of periphery, the second water-blocking tape is arranged between every two layers of peripheries, the third water-blocking tape is arranged on the outer sides of the plurality of layers of peripheries, the water-blocking yarns are clamped between the first water-blocking tape and the first layer of periphery and are configured to fix the first water-blocking tape, and the insulating layers are wrapped on the outer side of the third water-blocking tape. The first water-blocking tape and the water-blocking yarns provide longitudinal water resistance for the conductor central layer, the second water-blocking tape and the third water-blocking tape are combined to realize integral water resistance, and the insulation layer is used for insulation.

Description

Design and production process of waterproof cable

Technical Field

The invention relates to the technical field of cable manufacturing, in particular to a design and production process of a water-blocking cable.

Background

Cables are generally formed by twisting several or several groups of conductors, each group being insulated from each other and usually twisted around a center, and being surrounded by a highly insulating covering, characterized by an inner current-carrying and an outer insulation. The special cable is resistant to high temperature, acid and alkali, and resistant to termites, is used in ships, airplanes, nuclear power plants and other occasions, has different performances, and is suitable for different use environments.

The twisting of the cable can be divided into regular twisting, bundle twisting, complex twisting and the like, wherein the regular twisting is also called simple twisting and is formed by twisting wires with the same material and the same wire diameter, theoretically, the number of single wires on a central layer can be 1-6, the number of the single wires on each layer increases by 6 from the outside of the central layer, the twisting directions of adjacent layers are opposite, the twisting direction of the outermost layer is the right direction, and aluminum stranded wires, aluminum alloy stranded wires, aluminum-clad steel stranded wires and the like are regularly twisted.

Particularly, under the condition that the existing power cable laying and installing environment is more and more complex, the cable is not only attacked by insect pests, but also part of the cable well is difficult to drain water, so that cable patrolmen cannot go down the well to normally patrol, and the electric wire and the cable are enabled to be soaked in water for a long time. If the electric wire or cable is affected with damp or water, the safety performance and the service performance of the electric wire or cable are seriously affected, and the phenomenon of short circuit or spark, even a major fire accident, is easily caused in the electrifying process. When the water-blocking tape, the water-blocking yarn and the like are used for water-blocking protection of the cable in the prior art, the waterproof measures of the central layer of the normally stranded cable are not perfect, so that comprehensive waterproof of the cable cannot be realized, safety accidents are caused, and the service life of the cable is shortened.

Disclosure of Invention

The invention aims to provide a design and a production process of a waterproof cable, so as to realize the longitudinal and radial comprehensive waterproof of a normally stranded cable from the center to the periphery.

In order to achieve the purpose, the invention adopts the following technical scheme:

a water-blocking cable, comprising

The plurality of monofilaments comprise a central filament and a plurality of peripheral filaments, the plurality of peripheral filaments are arranged along the circumferential direction of the central filament and are radially arranged into a plurality of layers of peripheries along the central filament, and one layer of the periphery close to the central filament is arranged into a first layer of periphery;

the water-blocking tape comprises a first water-blocking tape, a second water-blocking tape and a third water-blocking tape, wherein the first water-blocking tape is arranged between the outer side of the central wire and the periphery of the first layer, the second water-blocking tape is arranged between the peripheries of every two layers, and the third water-blocking tape is arranged on the outer sides of the peripheries of the layers;

the waterproof yarn is clamped between the first waterproof tape and the periphery of the first layer and is configured to fix the first waterproof tape;

and the insulating layer is wrapped outside the third water-blocking tape.

Optionally, the insulating layer further comprises a polyethylene layer and a nylon layer, the polyethylene layer is arranged outside the insulating layer, and the nylon layer is arranged outside the polyethylene layer.

Optionally, the water blocking tape can be broken by pressure when being stressed, the water blocking yarn is clamped between the central yarn and the peripheral yarn when the water blocking tape is broken by pressure, and the central yarn and the peripheral yarn are in contact with each other.

Optionally, the packaging tape further comprises a filling layer and a tape, the tape is surrounded on the outer side of the insulating layer, and the filling layer is arranged in a gap between the tape and the insulating layer.

Optionally, the bag further comprises a composite tape, the composite tape is sleeved outside the bag strap, and the polyethylene layer is disposed outside the composite tape.

Optionally wherein the composite strip is provided as a double-sided aluminium-plastic composite strip.

Optionally, the nylon cable further comprises an armor layer and an outer sheath, the outer sheath is arranged outside the nylon layer, and the armor layer is clamped between the outer sheath and the nylon layer.

Optionally, wherein the insulating layer is made of cross-linked polyethylene.

The production process of the water-blocking cable comprises the following steps:

s1, carrying out monofilament drawing treatment;

s2, selecting a monofilament as a central filament, longitudinally wrapping a first water-blocking tape outside the central filament, and binding and winding water-blocking yarns outside the first water-blocking tape;

s3, preparing a conductor and a peripheral waterproof layer;

and S4, preparing an insulating layer.

Optionally, wherein the S3 includes:

s3.1, selecting a plurality of monofilaments (100) as peripheral filaments (102);

s3.2, twisting a plurality of peripheral wires outside the central wire and attaching the peripheral wires to the outer side of the water-blocking yarn to form a first layer of periphery;

s3.3, longitudinally wrapping a second water-blocking tape outside the periphery of the first layer;

s3.4, continuously twisting the outer side of the periphery of the first layer along the radial direction of the central wire to form the periphery of a second layer;

s3.5, longitudinally wrapping a second water-blocking tape outside the periphery of the second layer;

s3.6, continuously twisting the second layer periphery along the radial direction of the central wire to form a plurality of layers of peripheries, and longitudinally wrapping a second water-blocking tape between every two layers of peripheries;

and S3.7, longitudinally wrapping a third water-blocking tape outside the periphery of the outermost layer.

The invention has the beneficial effects that:

according to the invention, the first water-blocking tape and the water-blocking yarn are laid on the outer side of the central wire, the waterproof protection effect is achieved on the central layer, the second water-blocking tapes are arranged between the central layer and the periphery of the first layer and between the adjacent two layers of peripheries, the waterproof measure is provided for the periphery of each layer, the third water-blocking tape is arranged on the outer side of the periphery of the outermost layer, the waterproof measure is provided for the whole cable core while the monofilaments are wrapped together, so that triple waterproof is realized under the arrangement of the first water-blocking tape, the second water-blocking tape and the third water-blocking tape, the longitudinal waterproof effect of the central layer is improved, the monofilaments, the water-blocking tapes and the water-blocking yarns can be tightly twisted through the insulating layer, the outer layer is also insulated, and electric leakage is avoided.

Drawings

FIG. 1 is a cross-sectional view of a water-blocking cable according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a single electrical conductor of a water-blocking cable according to an embodiment of the present invention;

FIG. 3 is a schematic view of a center wire wound with a water blocking tape and a water blocking yarn of a water blocking cable according to an embodiment of the present invention;

fig. 4 shows the steps of the water-blocking cable according to the embodiment of the present invention.

In the figure:

100-monofilaments; 200-a strip pay-off rack; 300-a longitudinal wrapping table; 400-a winding machine; 101-center wire; 102-peripheral filaments; 10-water blocking tape; 11-a first water-blocking tape; 12-a second water-blocking tape; 13-a third water-blocking tape; 20-water blocking yarn; 30-an insulating layer; 40-a filling layer; 50-wrapping a tape; 60-a composite tape; 70-a polyethylene layer; 80-nylon layer.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

Under the more and more complicated condition of installation environment lays at present power cable, the cable not only easily receives the insect pest invasion and attack, and is difficult to under the condition of drainage at some cable shaft, and the unable well normal inspection that goes into the well of cable inspection personnel also makes the soak time of cable in aqueous normal, if the cable intakes, then can lead to great incident. In the prior art, when the waterproof tape and the waterproof yarn are used in a matched mode for waterproof protection, a normally twisted cable cannot provide a good waterproof measure for a central layer of the cable, so that comprehensive waterproof of the cable cannot be achieved, and the service life of the cable is further shortened.

The technical solution of the present embodiment is further described by the following detailed description with reference to the accompanying drawings.

As shown in fig. 1 to 2, the present embodiment provides a water-blocking cable including a plurality of monofilaments 100, a water-blocking tape 10, water-blocking yarns 20, and an insulating layer 30. Specifically, the plurality of monofilaments 100 include a central filament 101 and peripheral filaments 102, the plurality of peripheral filaments 102 are circumferentially arranged along the central filament 101 and radially arranged into a plurality of layers of peripheries along the central filament 101, a layer of periphery close to the central filament 101 is arranged into a first layer of periphery, the water-blocking tape 10 includes a first water-blocking tape 11, a second water-blocking tape 12 and a third water-blocking tape 13, the first water-blocking tape 11 is arranged between the outer side of the central filament 101 and the first layer of periphery, the second water-blocking tape 12 is arranged between every two layers of peripheries, the third water-blocking tape 13 is arranged on the outer side of the plurality of layers of peripheries, the water-blocking yarns 20 are clamped between the first water-blocking tape 11 and the first layer of periphery and configured to fix the first water-blocking tape 11, and the insulating layer 30 is wrapped on the outer side of the third water-blocking tape 13.

In this embodiment, a first water-blocking tape 11 and a water-blocking yarn 20 are laid on the outer side of a central wire 101 to play a role in waterproof protection for the central layer, a second water-blocking tape 12 is arranged between the central layer and the periphery of the first layer and between the peripheries of two adjacent layers to provide waterproof measures for the periphery of each layer, and a third water-blocking tape 13 is arranged on the outer side of the periphery of the outermost layer to provide waterproof measures for the whole cable core while wrapping a plurality of monofilaments 100 together, so that triple waterproofing is realized under the arrangement of the first water-blocking tape 11, the second water-blocking tape 12 and the third water-blocking tape 13 to improve the longitudinal waterproof effect of the central layer, and the insulating layer 30 can tightly twist the monofilaments 100 with the water-blocking tapes 10 and the water-blocking yarn 20, insulate the outer layer and avoid electric leakage.

The overall structure of the water blocking cable of the present embodiment will be explained below.

As shown in fig. 1, the water blocking cable of the present embodiment includes a monofilament 100, a water blocking tape 10, a water blocking yarn 20, an insulating layer 30, a filling layer 40, a wrapping tape 50, a composite tape 60, a polyethylene layer 70, and a nylon layer 80.

The water-blocking cable in the embodiment is provided with a cable core and a sheath, and a plurality of conductors are arranged in the cable core to realize the electrifying effect of the cable. Each conductor is made by regularly twisting a plurality of monofilaments 100, and the conductor further comprises a water blocking tape 10 and water blocking yarns 20, an insulating layer 30 is arranged on the outermost side of the conductor, a filling layer 40 is arranged on the outer side of the twisted plurality of conductors to form a cable core, and a wrapping tape 50, a composite tape 60, a polyethylene layer 70 and a nylon layer 80 are sequentially arranged on the outer side of the cable core to realize the tight wrapping of the cable.

Specifically, each conductor is made of a plurality of monofilaments 100 which are regularly twisted, and the outermost sides of the plurality of monofilaments 100 are wrapped by the insulating layer 30, so that the conductor with internal current conduction and external insulation is formed. Furthermore, the wrapping tape 50 is arranged around the outer sides of the plurality of electric conductors, and the filling layer 40 is arranged in a gap between the wrapping tape 50 and the electric conductors, so that the cable core is regular in shape, and the electric conductors can be stably placed in the wrapping tape 50.

In order to avoid the cable from being affected with damp and entering water and prevent insect damage, an outer coating layer is usually arranged on the outer side of the cable in the existing means, and a chemical agent is added on the outer coating layer, so that chemical insect damage prevention is realized, but when an operator installs and lays the cable, other uncomfortable symptoms such as allergy and the like are easily generated after touching the chemical agent, and personal safety is harmed. So set up polyethylene layer 70 and nylon layer 80 in this embodiment, and polyethylene layer 70 package is located a plurality of conductor outsides, and nylon layer 80 sets up in polyethylene layer 70 outsides to this changes chemical insect control into physics insect control through polyethylene layer 70 and nylon layer 80, and is allergic uncomfortable when avoiding personnel to contact the cable. Further, the polyethylene layer 70 also improves the radial water-blocking performance of the cable, and enhances the overall water-blocking performance of the cable from the outside to the inside.

Optionally, the composite tape 60, the polyethylene layer 70, and the nylon layer 80 are sequentially sleeved outside the tape 50, and the embodiment is further provided with an armor layer and an outer sheath disposed outside the nylon layer 80. Illustratively, the cable is a central wire 101, a first water-blocking tape 11, water-blocking yarns 12, a peripheral wire 102, a second water-blocking tape 12, a peripheral wire 102, a third water-blocking tape 13, an insulating layer 30, a filling layer 40, a wrapping tape 50, a composite tape 60, a polyethylene layer 70, a nylon layer 80, an armor layer and an outer sheath from inside to outside respectively. Radial waterproof of cable is realized through setting up of compound area 60 and polyethylene layer 70 to utilize nylon layer 80 to realize physics insect control, avoid personnel's anaphylaxis.

Specifically, as shown in fig. 2, a water blocking tape 10 and a water blocking yarn 20 are disposed in the conductor, wherein the water blocking tape 10 includes a first water blocking tape 11, a second water blocking tape 12 and a third water blocking tape 13. In this embodiment, the plurality of monofilaments 100 twisted to form the conductor include a central filament 101 and peripheral filaments 102, the plurality of peripheral filaments 102 are arranged along the circumferential direction of the central filament 101 and are uniformly arranged along the radial direction of the central filament 101 to form a plurality of layers of peripheries, optionally, the periphery of the innermost layer close to the central filament 101 is arranged as a first layer of periphery, and the periphery of the second layer, the periphery of the third layer and the like are arranged from inside to outside in sequence until the periphery of the outermost layer, so as to achieve regular twisting of the conductor.

Further, a first water blocking tape 11 is arranged between the periphery of the first layer and the outer side of the central wire 101, and water blocking yarns 20 are wound and bundled on the outer side of the first water blocking tape 11. The water blocking yarn 20 can fix the position of the first water blocking tape 11, the first water blocking tape 11 is wound outside the central wire 101 after being crushed by external force, longitudinal waterproof of the conductor central layer is achieved, and under the winding condition of the water blocking yarn 20, contact between the central wire 101 and the peripheral wire 102 is not affected, so that the cable can be normally electrified. Optionally, a second water-blocking tape 12 is arranged between the periphery of the first layer and the periphery of the second layer, and between each two layers of the periphery at the outer side, so that each layer of the conductor is waterproof. And a third water-blocking tape 13 is arranged on the outer side of the periphery of the outermost layer of the conductor so as to achieve the comprehensive water prevention of the conductor from inside to outside.

Exemplarily, a single wire 100 is made of a high-quality copper rod with a copper content of 99.99%, and is normally twisted to form a conductor according to a distribution mode of structures such as 7 (1 + 6), 19 (1 +6+ 12), 37 (1 +6+12+ 18), and the like. In other embodiments, a tinned copper wire or a bare copper wire may be used as the monofilament 100. The water-blocking tape 10 is a semi-conductive water-blocking tape to ensure that the longitudinal wrapping is compact and does not leak the wrapping. In other embodiments, other materials may be used, for example, the medium-voltage cable is made of a semiconductive water-blocking tape, and the low-voltage cable is made of a double-sided insulating water-blocking tape. Optionally, the compression coefficient of the conductor longitudinally wrapped by the water-blocking tape 10 is not less than 0.9, so as to ensure that the monofilaments 100 at the periphery of each two layers can be contacted with each other after the semiconductor water-blocking tape is stressed and crushed, and the whole conductive effect is not influenced.

Illustratively, the water-blocking yarn 20 is configured as a water-absorbent expansion structure, and the water-absorbent resin is selected as the material. After the water blocking yarn 20 winds around the outer side of the first water blocking tape 11 to absorb water, the volume is increased, and the water blocking yarn expands inwards under the limitation of the peripheral wire 102, so that longitudinal water prevention of the central wire 101 is achieved. Optionally, the water blocking yarn 20 is spirally wound outside the first water blocking tape 11 so as not to affect the contact between the central wire 101 and the peripheral wire 102 after the first water blocking tape 11 is crushed by a force.

In the present embodiment, the insulation layer 30 is made of cross-linked polyethylene, has a temperature resistance level of-40 ℃ to 90 ℃, so as to withstand the change of temperature difference between day and night, can be used in summer due to severe heat and winter due to severe cold, and has good electrical properties, low moisture absorption and excellent mechanical and physical properties. Further, the filling layer 40 is filled with a non-hygroscopic filler. Optionally, water-blocking yarns 20 may be disposed within the filler layer 40, thereby making the cable aesthetically rounded while being more water-resistant.

Illustratively, the tape 50 is made of a non-hygroscopic tape, optionally wrapped with 2 layers of non-hygroscopic nonwoven having a nominal thickness of 0.2mm, with a lap of 25% or more. Further, the composite tape 60 is a double-sided aluminum-plastic composite tape, i.e., a composite tape formed by coating plastic films on both sides of an aluminum tape. The double-sided aluminum-plastic composite belt has better waterproof performance when being matched with the polyethylene layer 70, and can ensure that the cable can be used in water for a long time. Specifically, the performance indexes of the double-sided aluminum-plastic composite tape used in this embodiment are as follows:

serial number	Item	Unit of	Require that
				1	Tensile strength	MPa	≥65
2	Elongation at break	％	≥15
				3	Peeling strength between aluminum strip and plastic film	N/cm	≥6.13

(continuation watch)

Watch 1

Optionally, the polyethylene layer 70 is made of polyethylene material, and has good mechanical properties, so as to facilitate radial waterproof. The nylon layer 80 is made of nylon 12 material, and the nylon 12 has better flexibility, chemical stability, oil resistance and wear resistance. Illustratively, the performance parameters of the polyethylene material are set forth in table two:

serial number	Test items	Unit	Typical value
				1	Specific gravity of	g/cm3	0.98
2	Tensile strength	MPa	12.5
				3	Elongation at break	％	350
4	After heat aging of air oven (110 ℃ for 240 h)

(continuation watch)

Watch two

Illustratively, the armor layer is made of galvanized steel strip or stainless steel wire materials so as to improve the compressive strength of the cable in direct burial, pipe penetration and tunnel laying. In the embodiment, the pressure resistance and the tensile resistance are enhanced after the armor layer is added, so that the cable is protected from external mechanical damage. Furthermore, the outer sheath is made of polyvinyl chloride or polyethylene and other materials, has the advantages of environmental protection, no halogen, no toxicity, no smell, no heavy metal, good flame retardant property and good mechanical and physical properties.

As shown in fig. 4, the production process of the water-blocking cable in this embodiment mainly includes:

s1, drawing a monofilament by 100 wires;

s2, selecting a monofilament 100 as a central wire 101, longitudinally wrapping a first water-blocking tape 11 on the outer side of the central wire 101, and binding water-blocking yarns 20 on the outer side of the first water-blocking tape 11;

s3, preparing a peripheral waterproof layer;

s4, preparing an insulating layer 30.

Specifically, step S1 includes:

s1.1, preparing a wire drawing lubricating liquid;

s1.2, testing the concentration of the wire drawing lubricating liquid by using a refractometer;

s1.3, checking a disc and a wire mold;

s1.4, drawing the monofilament 100.

In the embodiment, the wire drawing lubricant is copper wire drawing liquid, and the ratio concentration of the wire drawing liquid for copper heavy drawing is 6% -10%, the ratio concentration of medium drawing is 3% -6%, and the ratio concentration of small drawing is 2% -4%. During preparation, a refractometer is used for testing the concentration of the copper wire drawing lubricating liquid, and the lubricating liquid is added in time to adjust the concentration so as to reach the specification. Before drawing, the drawing lubricant is kept clean in the effective period, and during circulation, the temperature is controlled at 10-65 deg.c to ensure the lubricating effect.

Furthermore, the lubrication effect and the temperature condition of the lubricating liquid need to be paid attention to frequently in the drawing process, the lubrication pipeline needs to be kept smooth, the lubrication needs to be sufficient, impurities, copper scraps and the like cannot be accumulated in the die holder and the die hole, and therefore the lubrication effect and the service life of the die are not influenced; the used disc is ensured to be intact, the take-up tension is uniform and moderate, and the wire die is checked and well recorded before the wire drawing; the semi-finished round copper wire is stacked and transported without mechanical damage to the surface of the monofilament 100; the surface of the drawn monofilament 100 should be smooth, the color and luster should be bright, and the phenomena of severe oxidation, oil stain, burrs, bamboo joint and the like do not exist; when the wire is coiled, the wire should be flat and tight, and the phenomena of waist drum shape, horn shape and wire pressing disorder cannot occur. Specifically, the distance between the outermost layer of the finished disc and the edge of the side plate of the disc in the large drawing process is not less than 20mm, the outermost layer of the finished disc is bound at four positions during looping, and copper wires are fastened mutually; in the middle drawing process, the distance between the outermost layer of the finished wire coil and the edge of a side plate of the wire coil is not less than lOmm; the distance between the outermost layer of the finished wire coil and the edge of the side plate of the wire coil in the small drawing process is not less than 5mm.

Specifically, as shown in fig. 3, a central filament 101 is placed on a strip pay-off rack 200, a first water-blocking tape 11 with a nominal thickness of 0.3mm is wrapped on the outer side of the central filament 101 on a longitudinal wrapping table 300, and then water-blocking yarns 20 are spirally wound on the outer side of the first water-blocking tape 11 on a yarn winding machine 400, so as to achieve longitudinal waterproofing of the conductor central layer. The tape pay-off stand 200, the longitudinal wrapping table 300 and the yarn winding machine 400 are conventional in the art and will not be described herein.

Specifically, step S3 includes:

s3.1, selecting a plurality of monofilaments 100 as peripheral filaments 102;

s3.2, twisting a plurality of peripheral wires 102 outside the central wire 101, and attaching the peripheral wires to the outside of the water blocking yarns 20 to form a first layer of periphery;

s3.3, longitudinally wrapping a second water-blocking tape 12 on the outer side of the periphery of the first layer;

s3.4, continuously twisting the outer sides of the peripheries of the first layers along the radial direction of the central wires 101 to form the periphery of a second layer;

s3.5, longitudinally wrapping a second water-blocking tape 12 on the outer side of the periphery of the second layer;

s3.6, continuously twisting the second layer periphery outside along the radial direction of the central wire 101 to form a multi-layer periphery, and longitudinally wrapping a second water-blocking tape 12 between every two layers of peripheries;

s3.7, longitudinally wrapping a third water-blocking tape 13 at the outer side of the periphery of the outermost layer.

Illustratively, the twist direction of the twist pressing the periphery of the outermost layer of the round conductor is a left direction, and the twist direction of the periphery of the adjacent layer is opposite. Furthermore, the conductors are not welded in a whole, the broken ends of the monofilaments 100 can be repaired by welding, two or more joints cannot be arranged on the same section, and the distance between every two adjacent joints in the same layer is not less than 100mm. In the embodiment, the welding of the monofilament 100 should adopt resistance butt welding or cold pressure butt welding, the joint of the resistance butt welding should be annealed, each side of the annealing length is about 200mm, and 7 or less finished conductors cannot be welded. Alternatively, the conductor lay pitch is allowed to deviate by 20mm for the outer layer and 40mm for the remaining layers.

In this embodiment, the conductors are all twisted normally, such as 7 (1 + 6), 19 (1 +6+ 12), 37 (1 +6+12+ 18), and the like, and are distinguished according to the size of the cable cross-sectional area. For example, for a structure of 19, that is, divided into 3 layers, 1 central monofilament 100+ 1 second layer 6 monofilaments 100+ 12 monofilaments 100 on the third layer, after a layer of semi-conductive water-blocking tape is longitudinally wrapped outside a conductor central filament 101, in order to ensure that longitudinal wrapping is tight and tight without missing wrapping, a water-blocking yarn 20 is wrapped outside the longitudinally wrapped semi-conductive water-blocking tape, the semi-conductive water-blocking tape is placed between the second layer 6 peripheral filaments 102 and the third layer 12 peripheral filaments 102, and the conductor compression coefficient is not less than 0.9, so as to ensure that the semi-conductive water-blocking tapes in the 6 and 12 filaments can be broken by force, and the peripheral filaments 102 in the two layers can be contacted with each other, so as to ensure that the conductor gap is completely filled with the water-blocking material.

Illustratively, step S3 completes the preparation of the individual conductors, and step S4 completes the preparation of the individual conductors after the insulating layer 30 is applied to the outside of the individual conductors.

Further, the production process of the water-blocking cable further comprises the following steps:

s5, preparing a cable core;

s6, preparing the cable.

Optionally, step S5 comprises:

s5.1, stranding a plurality of electric conductors;

and S5.2, arranging a filling layer 40 outside the plurality of conductors to form the cable core.

Illustratively, the filling layer 40 is filled with a non-hygroscopic filler selected from materials that are pre-treated in an oven at a temperature of 50 ± 5 ℃ for 24 ± 1 hour, then cooled in a desiccator, and then placed in an environment at a temperature of 20 ± 5 ℃ and a humidity of 95 ± 4% for 48 hours, absorbing no more than 5% by weight of water, thereby making the cable aesthetically rounded.

Optionally, step S6 includes:

s6.1, preparing a wrapping tape 50;

s6.2, preparing a composite belt 60;

s6.3, preparing a polyethylene layer 70 and preparing a nylon layer 80.

Illustratively, in step S6.1, the tape 50 is wrapped tightly and flatly to avoid leakage and loose package at any position, and the tape 50 is made of non-hygroscopic tape, and similarly, the non-hygroscopic tape is pre-treated in an oven at 50 ± 5 ℃ for 24 ± 1 hour, then cooled in a drier, and then placed in an environment at 20 ± 5 ℃ and 95 ± 4% humidity for 48 hours, and the weight of the absorbed moisture does not exceed 5%.

Further, step S6.2 comprises:

s6.2.1, placing the cable core on a pay-off rack;

s6.2.2, penetrating the cable core through a horn-shaped die;

s6.2.3, covering the composite belt 60 outside the belt 50 through a horn-shaped die;

and S6.2.4, heating the cable core coated with the composite tape 60 by using a heating device.

Specifically, the cable core is placed on a pay-off stand, and longitudinal wrapping operation of the double-sided aluminum-plastic composite belt with the nominal thickness of 0.30mm is carried out. Through loudspeaker type mould, the mould will indulge the two-sided aluminium-plastic composite belt of package and tighten up the size of hugging closely the cable core, and wherein loudspeaker type mould can carry out the customization according to the external diameter of cable core to make better the laminating in the cable core outside of two-sided aluminium-plastic composite belt. Then heating the double-sided aluminum-plastic composite tape by a heating device to ensure that the plastic surfaces of the double-sided aluminum-plastic composite tape are mutually adhered and tightly adhered together to form a radial waterproof layer of the cable.

Optionally, step S6.3 comprises:

s6.3.1, arranging a double-layer co-extrusion extruder, wherein the inner layer is a polyethylene layer 70, and the outer layer is a nylon layer 80;

and S6.3.2, passing the heated cable core through a double-layer co-extrusion extruder, and sequentially coating a polyethylene layer 70 and a nylon layer 80 on the outer side.

Illustratively, the double-layer co-extrusion extruder is a machine with screws of 120mm and 90mm respectively, and in other embodiments, different extruders can be selected according to requirements. Further, the cable core enters a double-layer co-extrusion extruder after passing through the heating device, the double-layer co-extrusion extruder carries out double-layer co-extrusion, and the inner layer is a polyethylene layer 70 and is made of polyethylene materials. Illustratively, the extrusion has a nominal thickness of 2.0mm as a second radial waterproof layer of the cable to ensure the radial waterproof performance of the cable. The outer layer is a nylon layer 80 made of nylon 12 material, and the thickness of the extruded nylon layer is not less than 0.2mm exemplarily, so that the nylon layer is used as an insect-proof layer of the cable to realize physical insect-proof.

In this embodiment, polyethylene layer 70 and nylon layer 80 can realize two characteristics of radial waterproof and insect-attack prevention of cable through one process of double-deck coextrusion extruder, can not only reduce the construction process, and can shorten the preparation of cable long to reduce chemical reagent's use, be the physics insect-attack prevention with the improvement of chemistry insect-attack prevention, avoid operation personnel's allergy and the emergence of other uncomfortable symptoms. The use that combines two-sided plastic-aluminum composite tape realizes the dual radial waterproof effect in the cable core outside, cooperates the vertical waterproof of cable core centre layer for the cable obtains comprehensive protection, when guaranteeing the insect-proof, reaches comprehensive water-blocking effect, extension cable life.

Optionally, the production process of the water-blocking cable further comprises

S7, preparing an armor layer;

s8, preparing an outer sheath.

Illustratively, the armor layer is made of galvanized steel tape or stainless steel wire material to increase the compressive strength of the cable. Under the environment such as direct-burried, poling, tunnel laying, short distance are maked somebody a mere figurehead and are laid, lay perpendicularly, the tensile strength of accessible steel wire armor increase cable improves the crushing resistance or the tensile resistance of whole cable, and the protection cable avoids outside mechanical damage. When the outer sheath is prepared, the outer sheath is made of materials such as polyvinyl chloride and polyethylene, the environmental protection performance of the cable is enhanced, and the cable is halogen-free, non-toxic, tasteless and heavy metal-free, and the flame retardant performance and the mechanical and physical performance of the cable are enhanced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A water-blocking cable, characterized in that it comprises

The monofilament yarns (100) comprise central yarns (101) and peripheral yarns (102), the peripheral yarns (102) are arranged along the circumferential direction of the central yarns (101) and are radially arranged along the central yarns (101) to form a plurality of layers of peripheries, and one layer of the periphery close to the central yarns (101) is arranged to be a first layer of periphery;

the waterproof belt (10) comprises a first waterproof belt (11), a second waterproof belt (12) and a third waterproof belt (13), the first waterproof belt (11) is arranged between the outer side of the central wire (101) and the periphery of the first layer, the second waterproof belt (12) is arranged between the peripheries of every two layers, and the third waterproof belt (13) is arranged on the outer sides of the peripheries of the layers;

a water-blocking yarn (20) sandwiched between the first water-blocking tape (11) and the first layer periphery, configured to fix the first water-blocking tape (11);

and the insulating layer (30) is wrapped on the outer side of the third water-blocking tape (13).

2. A water-blocking cable according to claim 1, further comprising a polyethylene layer (70) and a nylon layer (80), said polyethylene layer (70) being disposed outside said insulating layer (30), said nylon layer (80) being disposed outside said polyethylene layer (70).

3. The water-blocking cable according to claim 1, wherein the water-blocking tape (10) is capable of being crushed by a force, and when the water-blocking tape (10) is crushed by a force, the water-blocking yarns (20) are sandwiched between the central wire (101) and the peripheral wire (102), and the central wire (101) and the peripheral wire (102) are in contact with each other.

4. Water-blocking cable according to claim 2, further comprising a filler layer (40) and tape (50), said tape (50) being wrapped outside said insulating layer (30), said filler layer (40) being arranged in the gap between said tape (50) and said insulating layer (30).

5. The water-blocking cable according to claim 4, further comprising a composite tape (60), wherein the composite tape (60) is sleeved outside the tape (50), and the polyethylene layer (70) is arranged outside the composite tape (60).

6. A water-blocking cable according to claim 5, wherein the composite tape (60) is provided as a double-sided aluminium-plastic composite tape.

7. The water-blocking cable according to claim 2, further comprising an armor layer and an outer sheath, wherein the outer sheath is disposed outside the nylon layer (80), and the armor layer is sandwiched between the outer sheath and the nylon layer (80).

8. A water-blocking cable according to claim 1, wherein said insulating layer (30) is made of cross-linked polyethylene.

9. The production technology of the water-blocking cable is characterized by comprising the following steps:

s1, drawing a monofilament (100);

s2, selecting a monofilament (100) as a central wire (101), longitudinally wrapping a first water-blocking tape (11) on the outer side of the central wire (101), and binding and winding water-blocking yarns (20) on the outer side of the first water-blocking tape (11);

s3, preparing a peripheral waterproof layer;

s4, preparing an insulating layer (30).

10. A process for the production of a water-blocking cable according to claim 9, wherein said S3 comprises:

s3.1, selecting a plurality of monofilaments (100) as peripheral filaments (102);

s3.2, twisting a plurality of peripheral wires (102) outside the central wire (101) and attaching the peripheral wires to the outside of the water blocking yarn (20) to form a first layer of periphery;

s3.3, longitudinally wrapping a second water-blocking tape (12) on the outer side of the periphery of the first layer;

s3.4, continuously twisting the outer side of the periphery of the first layer along the radial direction of the central wire (101) to form the periphery of a second layer;

s3.5, longitudinally wrapping a second water-blocking tape (12) on the outer side of the periphery of the second layer;

s3.6, continuously twisting the second layer periphery along the radial direction of the central wire (101) to form a plurality of layers of peripheries, and longitudinally wrapping a second water-blocking tape (12) between every two layers of peripheries;

s3.7, longitudinally wrapping a third water-blocking tape (13) on the outer side of the periphery of the outermost layer.

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