Multi-layer synergistic flame-retardant cable and preparation method thereof
By introducing multi-layer collaborative flame retardant design and specific materials into the cable, the problem of insufficient flame retardant effect of existing cables is solved, and the efficient flame retardant performance of the cable is achieved and the safety of use is improved.
Patent Information
- Application Number
- CN202510750133.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-08-12
AI Technical Summary
The existing cable has a simple structure and insufficient flame retardant effect, which leads to fires easily in dense laying places and is not safe enough when used.
It adopts a multi-layer collaborative flame retardant design, including conductor wire core and refractory layer, insulating layer, cable-wound cladding, filling layer, inner liner layer, armor layer, armor winding cladding and outer cover layer. It uses materials such as silane cross-linked polyethylene insulating material, halogen-free flame-retardant polyolefin sheath and halogen-free low-smoke flame-retardant glass tape to improve flame retardant performance through multi-layer synergy.
It significantly improves the flame retardant performance of the cable, making the cable safer when used and reduces fire risk.
Smart Images
Figure CN120473216A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cables, and in particular to a multi-layer coordinated flame-retardant cable and a preparation method thereof. Background Art
[0002] Cable is an electrical device used to transmit electrical energy or signals. With the continuous growth of the economy and the advancement of science and technology, the demand for cables has increased significantly, and their safety performance has also attracted widespread attention.
[0003] Cables in the prior art are composed of one or more insulated conductors, which are usually wrapped in insulation and protective layers. The protective layers and insulation layers in the cable structure are usually composed of plastic and rubber materials. In places where cables are densely laid, fires are very likely to occur. The structure of existing cables is usually relatively simple, and the flame retardant effect of the cables is insufficient, making them unsafe to use. Summary of the Invention
[0004] The object of the present invention is to provide a multi-layer collaborative flame-retardant cable and a preparation method thereof, which can improve the flame-retardant effect of the cable and make the cable safer when used.
[0005] To achieve the above objectives, in a first aspect, the present invention provides a multi-layer coordinated flame-retardant cable, comprising a conductor core and a protective assembly, wherein the protective assembly comprises a fire-resistant layer, an insulating layer, a cabling wrapping layer, a filling layer, an inner lining layer, an armor layer, an armor wrapping layer, and an outer sheath;
[0006] The fire-resistant layer is connected to the conductor core and is located outside the conductor core; the insulation layer is connected to the fire-resistant layer and is located outside the fire-resistant layer; the cabling wrapping layer is connected to the insulation layer and is located outside the insulation layer; the filling layer is arranged between the insulation layer and the cabling wrapping layer; the inner lining layer is connected to the cabling wrapping layer and is located outside the cabling wrapping layer; the armor layer is connected to the inner lining layer and is located outside the inner lining layer; the armor wrapping layer is connected to the armor layer and is located outside the armor layer; the outer sheath is connected to the armor wrapping layer and is located outside the armor wrapping layer.
[0007] Wherein, the material of the insulating layer is silane cross-linked polyethylene insulating material.
[0008] Wherein, the material of the inner lining layer is halogen-free flame-retardant polyolefin sheath material.
[0009] Wherein, the material of the armor wrapping layer is halogen-free low-smoke flame-retardant glass cloth tape.
[0010] Wherein, the material of the outer sheath is halogen-free flame-retardant polyolefin sheath material.
[0011] In a second aspect, the present invention further provides a method for preparing a multi-layer collaborative flame-retardant cable, comprising:
[0012] Drawing the copper rod into copper monofilament of specified diameter;
[0013] Twisting multiple drawn copper monofilaments to form a conductor core;
[0014] Wrap the fire-resistant mica tape tightly around the conductor core to form a fire-resistant layer;
[0015] The silane cross-linked polyethylene insulation material is melted and evenly wrapped on the fire-resistant layer to form an insulation layer;
[0016] Arrange multiple conductor cores with insulation layers in a designed manner to form a cable core, fill them with high-temperature resistant filling ropes to form a filling layer, and wrap them with OPP tapes to form a cable wrapping layer;
[0017] After the cable is formed, a layer of halogen-free flame-retardant polyolefin sheath material is extruded outside the cable core to form an inner lining layer;
[0018] The galvanized steel strip is wrapped around the inner lining in a double-layer left-hand spiral gap wrapping method to form an armor layer;
[0019] Wrapping halogen-free low-smoke flame-retardant glass cloth tape outside the armor layer to form an armor wrapping layer;
[0020] The halogen-free flame-retardant polyolefin sheath material is melted and wrapped around the armor wrapping layer to form an outer sheath to prepare a multi-layer coordinated flame-retardant cable.
[0021] Among them, in the step of twisting a plurality of drawn copper monofilaments to form a conductor core:
[0022] The outermost layer of the conductor is twisted in the left direction, and the twisting direction of each layer is opposite from the outside to the inside, and the pitch ratio of the outer layer is smaller than the pitch ratio of the inner layer.
[0023] Among them, in the step of melting the silane cross-linked polyethylene insulation material and uniformly wrapping it on the fire-resistant layer to form the insulation layer,
[0024] After the insulation layer is formed, the two ends of the cable are sealed and placed in 90-95°C steam for steam cross-linking.
[0025] The specific steps of wrapping the halogen-free low-smoke flame-retardant glass cloth tape around the armor layer to form the armor wrapping layer include:
[0026] Two layers of halogen-free, low-smoke, flame-retardant glass cloth tapes are wrapped around the outside of the armor layer at an overlap rate of 10-20%. The wrapping direction is left-handed and tightly wrapped around the armored wire core to form an armor wrapping layer.
[0027] The present invention discloses a multi-layer collaborative flame-retardant cable and a preparation method thereof. The conductor core adopts a copper conductor, and is formed by drawing a copper rod into a copper monofilament of a specified diameter, and twisting a plurality of the drawn copper monofilaments together to form the conductor core; the fire-resistant layer is formed by tightly wrapping a fire-resistant mica tape around the outside of the conductor core; the insulation layer is formed by evenly wrapping a melted silane cross-linked polyethylene insulation material around the fire-resistant layer; the cable core is twisted into a cable core according to a designed arrangement, filled with a high-temperature resistant filling rope to form a filling layer, and wrapped with an OPP tape to form the cable wrapping layer; and a layer of halogen-free flame-retardant polyolefin sheath is extruded around the cable core after cabling. The inner lining layer is formed by wrapping a galvanized steel strip around the inner lining layer in a double-layer left-hand spiral gap wrapping manner to form the armor layer; a halogen-free low-smoke flame-retardant glass cloth tape is wrapped around the armor layer to form the armor wrapping layer; a halogen-free flame-retardant polyolefin sheathing material is melted and wrapped around the armor wrapping layer to form the outer sheath; the fire-resistant layer, the insulating layer, the cabling wrapping layer, the filling layer, the inner lining layer, the armor layer, the armor wrapping layer and the outer sheath are arranged on the conductor core, and the flame retardant performance of the cable is greatly improved through multi-layer collaborative flame retardancy, making the cable safer when used. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.
[0029] Figure 1 It is a schematic diagram of the overall structure of the multi-layer cooperative flame retardant cable of the present invention.
[0030] Figure 2 It is a flow chart of the method for preparing a multi-layer collaborative flame-retardant cable of the present invention.
[0031] Figure 3 This is a specification table of identification marks for insulated wire cores of the present invention.
[0032] Figure 4 The invention discloses a voltage parameter table for a power frequency spark test of an insulated wire core.
[0033] Figure 5 It is a table of steam cross-linking process parameters of the present invention.
[0034] Figure 6 This is a parameter table of cabling pitch ratios of the present invention.
[0035] Figure 7 This is a parameter table for selecting the width of the armor material of the present invention.
[0036] Figure 8 This is a voltage parameter table of the outer sheath spark test of the present invention.
[0037] 1-conductor core, 2-fire-resistant layer, 3-insulation layer, 4-cabling wrapping layer, 5-filling layer, 6-inner lining layer, 7-armor layer, 8-armor wrapping layer, 9-outer sheath. DETAILED DESCRIPTION
[0038] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0039] First, see Figure 1 The present invention provides a multi-layer collaborative flame-retardant cable, including a conductor core 1 and a protective component, wherein the protective component includes a fire-resistant layer 2, an insulating layer 3, a cabling wrapping layer 4, a filling layer 5, an inner lining layer 6, an armor layer 7, an armor wrapping layer 8 and an outer sheath 9; the above-mentioned scheme can improve the flame retardant effect of the cable, making the cable safer when used.
[0040] According to this specific embodiment, the fire-resistant layer 2 is connected to the conductor core 1 and is located outside the conductor core 1; the insulating layer 3 is connected to the fire-resistant layer 2 and is located outside the fire-resistant layer 2; the cabling wrapping layer 4 is connected to the insulating layer 3 and is located outside the insulating layer 3; the filling layer 5 is arranged between the insulating layer 3 and the cabling wrapping layer 4; the inner lining layer 6 is connected to the cabling wrapping layer 4 and is located outside the cabling wrapping layer 4; the armor layer 7 is connected to the inner lining layer 6 and is located outside the inner lining layer 6; the armor wrapping layer 8 is connected to the armor layer 7 and is located outside the armor layer 7; the outer sheath 9 is connected to the armor wrapping layer 8 and is located outside the armor wrapping layer 8. By arranging the fire-resistant layer 2, the insulating layer 3, the cabling wrapping layer 4, the filling layer 5, the inner lining layer 6, the armor layer 7, the armor wrapping layer 8 and the outer sheath 9 on the conductor core 1, the flame retardant performance of the cable is greatly improved through multi-layer collaborative flame retardancy, making the cable safer when used.
[0041] The insulating layer 3 is made of silane cross-linked polyethylene insulating material.
[0042] Secondly, the material of the inner lining layer 6 is a halogen-free flame-retardant polyolefin sheath material.
[0043] At the same time, the material of the armor wrapping layer 8 is halogen-free low-smoke flame-retardant glass cloth tape.
[0044] In addition, the outer sheath 9 is made of halogen-free flame-retardant polyolefin sheath material.
[0045] The multi-layer collaborative flame-retardant cable of the present invention adopts a copper conductor as the conductor core 1. The conductor core 1 is formed by drawing a copper rod into a copper monofilament of a specified diameter and twisting a plurality of the drawn copper monofilaments; the fire-resistant layer 2 is formed by tightly wrapping a fire-resistant mica tape around the outside of the conductor core 1; the insulation layer 3 is formed by evenly wrapping a melted silane cross-linked polyethylene insulation material around the fire-resistant layer 2; the cable core is twisted into a cable core according to a design arrangement, filled with a high-temperature resistant filling rope to form a filling layer 5, and wrapped with an OPP tape to form the cable wrapping layer 4; a layer of halogen-free flame-retardant polyolefin sheathing material is extruded around the cable core after cabling to form the cable core. Inner lining layer 6; the armor layer 7 is formed by wrapping galvanized steel strip around the inner lining layer 6 in a double-layer left-hand spiral gap wrapping manner; the armor wrapping layer 8 is formed by wrapping a halogen-free low-smoke flame-retardant glass cloth tape around the armor wrapping layer 7; the halogen-free flame-retardant polyolefin sheathing material is melted and wrapped around the armor wrapping layer 8 to form the outer sheath 9; the fire-resistant layer 2, the insulating layer 3, the cabling wrapping layer 4, the filling layer 5, the inner lining layer 6, the armor layer 7, the armor wrapping layer 8 and the outer sheath 9 are arranged on the conductor core 1, and the flame retardant performance of the cable is greatly improved through a multi-layer collaborative flame retardant method, making the cable safer when used.
[0046] Second, see Figure 2-Figure 8 The present invention also provides a method for preparing a multi-layer collaborative flame-retardant cable, comprising:
[0047] S100 draws the copper rod into copper monofilament of specified diameter;
[0048] In the embodiments of the present invention, the copper used in the cable is electrical-grade copper with a purity of 99.95% or higher. The copper rod is drawn and annealed continuously, and annealed simultaneously. Annealing utilizes short-circuit current heated steam protection to prevent copper oxidation during the annealing process. The copper annealing temperature is approximately 500°C. The drawing speed and temperature of the copper rod are tailored to the wire diameter and the short-circuit current heating required during drawing.
[0049] S200 twists a plurality of drawn copper monofilaments to form a conductor core 1;
[0050] In this step, the outermost layer of the conductor is twisted in the left direction, and the twisting direction of each layer is opposite from the outside to the inside, and the pitch ratio of the outer layer is smaller than the pitch ratio of the inner layer.
[0051] In the embodiments of the present invention, the conductors are twisted using a regular lay, i.e., a 1+6+12+18+24 arrangement. The outermost layer of the conductors is twisted in the left direction, and each layer is twisted in the opposite direction from the outside to the inside. The conductor twist pitch is specified by the pitch ratio. From the outside to the inside, the pitch ratio of the outer layer must be smaller than that of the inner layer. Otherwise, the stranded conductor will be loose and not compact. For example, the pitch ratio of the outermost layer is 12 times, the next outermost layer is 15 times, and the inner layer is 20 times, increasing in this order. The innermost layer is generally no more than 24 times.
[0052] S300: tightly wrap the fire-resistant mica tape around the conductor core 1 to form a fire-resistant layer 2;
[0053] In the embodiment of the present invention, the surface of the conductor core 1 is cleaned to keep it smooth and free of oil, and the burrs, sharp edges, protrusions, and broken wires on the conductor core 1 are removed. The coated surface of the fire-resistant mica tape is placed close to the conductor core 1 with the textured surface facing outward; the wrapped core is evenly wrapped without looseness or burrs, and the number of wrapping layers and overlapping width should meet the process requirements. The wrapping tape joints should be smooth, and the outer diameter of the joints should not be greater than 10% of the wrapping outer diameter. When the cross-section of the conductor core 1 is ≤35mm 2 Use reel-coated mica tape, conductor core cross-section > 35mm 2 Use coated mica tape, conductor core cross section <10mm 2 OPP tape is not included; the thickness of the fire-resistant mica tape is 0.15mm, and the wrapping overlap ratio is as follows: the cross section of the conductor core 1 is ≤6mm 2 , overlap rate is 20-30%, conductor core cross section > 6mm 2 , the overlap rate is 20-25%; the conductor core cross section is greater than or equal to 10mm 2 When the fire-resistant mica tape is used, a layer of OPP tape needs to be wrapped around it with a thickness of 0.05mm and an overlap rate of 15-20%.
[0054] S400 melts the silane cross-linked polyethylene insulation material and evenly wraps it on the fire-resistant layer 2 to form an insulation layer 3;
[0055] In the embodiment of the present invention, an insulation mark is set on the insulated wire core. The insulated wire core can be marked with a number, or with a colored yarn or a masterbatch. When the masterbatch mark is used, the masterbatch addition ratio is (black 1.2%, yellow, green, red, blue 2.4%). For details, see Figure 3 , of which: 6mm 2 The cross-sections below 10mm should be separated by color masterbatch. 2Colored yarn or ribbons are used for color separation for cross-sections of 100 mm and above. When using digital markings, the maximum distance between two adjacent complete markings on the insulated wire core is 25 mm, and the minimum height of the digital marking is 4.5 mm. The digital markings should be clear and resistant to abrasion. Gently wipe them 10 times with a wet cotton cloth or absorbent cotton. The markings should remain unchanged after wiping.
[0056] The silane cross-linked polyethylene insulation material is melted by an extruder and evenly wrapped on the outer layer of the fire-resistant mica tape to form an insulation layer 3, thereby obtaining an insulated wire core. The average value of the insulation thickness of the wire core should not be less than the nominal value, and the thickness at the thinnest point should not be less than 90% - 0.1 mm of the nominal value. The head and mold of the extruder should be cleaned before and after extrusion. Two layers of filter screens are generally used for insulation extrusion, and the mesh size of each layer of filter screen is 80 mesh. The head is cleaned once per shift and the filter screen is replaced at the same time. The insulation wrapping should be tight and round, and the surface should be smooth, uniform in color, and free of defects such as mechanical damage. The silane cross-linked insulation material should be cooled in sections during extrusion, with the water temperature ranging from high to low. The temperature of the first water tank should not be less than 90°C. The empirical formula for extrusion mold matching is:
[0057] Mold core D1 = D + e1; mold sleeve D2 = D1 + 2δ + 4△ + e2.
[0058] The meanings of the symbols are as follows: D - the maximum diameter of the semi-finished product before production (mm); D1 - the inner diameter of the mold core (mm); D2 - the inner diameter of the mold sleeve (mm);
[0059] δ - core nozzle wall thickness (mm); △ - extruded plastic layer thickness (mm); e1 - core magnification value (mm); e2 - sleeve magnification value (mm).
[0060] Among them, the magnification value of the insulating wire core mold core e1 is 0.3 to 5 mm; the magnification value of the insulating wire core mold sleeve e2 is 2 to 4 mm.
[0061] The power frequency spark test is carried out on the insulated wire core. During the test, the conductor of the tested insulated wire core should be reliably grounded. The test table of power frequency spark test voltage is as follows: Figure 4 shown.
[0062] After the silane cross-linked polyethylene insulation material is extruded and the insulation layer 3 is formed, the two ends of the cable are sealed and placed in 90-95℃ steam for steam cross-linking. The steam schedule is as follows: Figure 5 shown.
[0063] S500: twisting a plurality of conductor cores 1 with insulating layers 3 formed thereon into a cable core according to a designed arrangement, filling with high temperature resistant filling rope to form a filling layer 5, and wrapping with an OPP tape to form a cable wrapping layer 4;
[0064] In the embodiment of the present invention, a plurality of insulating cores having formed insulating layers 3 are twisted into a cable core according to a designed arrangement. The insulating cores should be arranged in a clockwise direction according to the following sequence.
[0065] Color identification is as follows: two cores: red, blue; three cores (3): red, yellow, green; three cores (2+1): red, yellow, blue; four cores: (4, 3+1): red, yellow, green, blue; five cores: (5, 3+2, 4+1): red, yellow, green, blue, black.
[0066] The digital identification is as follows: two cores: 1, 0; three cores: 1, 2, 3; four cores: 1, 2, 3, 0; five cores: 1, 2, 3, 4, 0.
[0067] refer to Figure 1 The top insulated wire core is set to green. Starting with the top green insulated wire core, the colors of the five insulated wire cores arranged clockwise are green, red, blue, black, and yellow.
[0068] The width deviation of the wrapping tape can vary within the range of -10 to +15 mm, but it is preferably selected according to the process requirements. The cabling direction is right-hand, and the cabling pitch ratio is as follows: Figure 6 ; The nominal cross-section of the wire core is 1.5~6mm 2 1+1+3 / 1600 type cabling machine and 1+6 / 630 cage stranding machine can be selected; 10~70mm 2 1.25m cabling machine and 1.6m cabling machine can be selected; 95~400mm 2 1.6m cabling machine, 2.5m cabling machine and 3.15m cabling machine are available for selection.
[0069] S600 extrudes a layer of halogen-free flame-retardant polyolefin sheath material outside the cable core after cabling to form an inner lining layer 6;
[0070] In the embodiment of the present invention, an extruder is used to extrude a layer of halogen-free flame-retardant polyolefin sheathing material outside the cable core after cabling to form an inner lining layer 6. The inner lining layer 6 should be tightly extruded on the cable core. The surface of the inner lining layer 6 should be smooth, round, and have a uniform outer diameter. There should be no defects such as cracks, disconnections, flattening, severe core deviation, unevenness, blistering, lumps, scorching, and mechanical damage. The extruder head and mold should be cleaned before and after extrusion. If the cable appearance is unqualified or there are burnt particles or debris on the surface, the head should be cleaned and the filter screen should be replaced at any time. The theoretical formula for extrusion mold matching is:
[0071] Mold core D1 = D + e1; mold sleeve D2 = D1 + 2δ + 4△ + e2.
[0072] The meanings of the symbols are as follows: D - the maximum diameter of the semi-finished product before production (mm); D1 - the inner diameter of the mold core (mm); D2 - the inner diameter of the mold sleeve (mm);
[0073] δ - core nozzle wall thickness (mm); △ - extruded plastic layer thickness (mm); e1 - core magnification value (mm); e2 - sleeve magnification value (mm).
[0074] Among them, the magnification value of the mold core e1 of the inner lining layer 6 is 2 to 6 mm; the magnification value of the mold sleeve e2 of the inner lining layer 6 is 2 to 5 mm.
[0075] S700 wraps the galvanized steel strip around the inner lining layer 6 in a double-layer left-hand spiral gap wrapping manner to form an armor layer 7;
[0076] In the embodiment of the present invention, the armoring equipment is an 800 armoring machine. The armoring method of the galvanized steel strip is: double-layer left-hand spiral gap wrapping, and the gap of the inner galvanized steel strip should be covered by the part of the outer galvanized steel strip near the middle. The galvanized steel strip wrapping should be flat and tight, without flaring, looseness, folded edges and exposed bottom, etc. The joints of the galvanized steel strip must be welded, and the rough surface should be smoothed without sharp corners and warping. The joints should be treated with anti-corrosion. It is strictly forbidden for the burrs on the edge of the galvanized steel strip to penetrate the cable core. The galvanized steel strip is pressed Figure 7 It is stipulated that the width of the steel strip can be adjusted within the process specified range of -10 to +10 mm as needed, and the wrapping gap should be controlled at 40% to 50% of the width of the metal strip.
[0077] S800 wraps a halogen-free, low-smoke, flame-retardant glass cloth tape around the armor layer 7 to form an armor wrapping layer 8;
[0078] In the embodiment of the present invention, two layers of halogen-free low-smoke flame-retardant glass cloth tape are wrapped around the outer surface of the armor layer 7 at an overlap rate of 10-20%, with the wrapping direction being left-handed, and tightly wrapped around the armor core to form an armor wrapping layer 8. The surface is kept flat and free of disconnection, missing layers, folds, and wrinkles. The width of the tape is a reference size, and the nominal cross-section of the core is 1.5-6mm. 2 The selection of 1+1+3 / 1600 type cabling machine, 1+6 / 630 cage stranding machine cabling machine; 10~70mm 2 Choose 1.25m cabling machine, 1.6m cabling machine; 95~400mm 2 Choose 1.6m cabling machine, 2.5m cabling machine and 3.15m cabling machine.
[0079] S900 melts the halogen-free flame-retardant polyolefin sheath material and wraps it around the armor wrapping layer 8 to form an outer sheath 9, thereby producing a multi-layer coordinated flame-retardant cable.
[0080] In the embodiment of the present invention, a halogen-free flame-retardant polyolefin sheathing material is melted by an extruder and then wrapped around the armor wrapping layer 8 to form an outer sheath 9. The extruder head and mold should be cleaned before and after extrusion. If the cable appearance is unqualified, such as burnt particles or debris on the surface, the head should be cleaned and the filter replaced at any time. The surface should be flat, uniform in color, well plasticized, and free of defects such as dents, burns, sharp corners, holes, disconnections, bamboo knots, rough particles, and air holes. The theoretical formula for extrusion die matching is:
[0081] Mold core D1 = D + e1; mold sleeve D2 = D1 + 2δ + 4△ + e2.
[0082] The meanings of the symbols are as follows: D - the maximum diameter of the semi-finished product before production (mm); D1 - the inner diameter of the mold core (mm); D2 - the inner diameter of the mold sleeve (mm);
[0083] δ - core nozzle wall thickness (mm); △ - extruded plastic layer thickness (mm); e1 - core magnification value (mm); e2 - sleeve magnification value (mm).
[0084] Among them, the magnification value of the outer jacket mold core e1 is 4 to 8 mm; the magnification value of the outer jacket mold sleeve e2 is 4 to 8 mm.
[0085] After the outer sheath 9 is formed, a spark test should be carried out. When a power frequency spark tester is used for the test, the tested cable armor should be grounded. When a DC spark tester is used for the test, the tested cable armor should generally be connected to the negative pole of the DC power supply. The test voltage value should comply with Figure 8 The regulations shown.
[0086] The present invention provides a method for preparing a multi-layer collaborative flame-retardant cable. By processing the fire-resistant layer 2, the insulating layer 3, the cabling wrapping layer 4, the filling layer 5, the inner lining layer 6, the armor layer 7, the armor wrapping layer 8 and the outer sheath 9 on the conductor core 1, the flame retardant performance of the cable is greatly improved through multi-layer collaborative flame retardancy, making the cable safer when used.
[0087] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.
Claims
1. A multi-layered flame-retardant cable comprising a conductor core, characterized in that: Also included are protection components; The protective assembly includes a fire-resistant layer, an insulating layer, a cabling wrapping layer, a filling layer, an inner lining layer, an armor layer, an armor wrapping layer and an outer sheath; The fire-resistant layer is connected to the conductor core and is located outside the conductor core; the insulation layer is connected to the fire-resistant layer and is located outside the fire-resistant layer; the cabling wrapping layer is connected to the insulation layer and is located outside the insulation layer; the filling layer is arranged between the insulation layer and the cabling wrapping layer; the inner lining layer is connected to the cabling wrapping layer and is located outside the cabling wrapping layer; the armor layer is connected to the inner lining layer and is located outside the inner lining layer; the armor wrapping layer is connected to the armor layer and is located outside the armor layer; the outer sheath is connected to the armor wrapping layer and is located outside the armor wrapping layer.
2. The multi-layered flame-retardant cable according to claim 1, characterized in that: The material of the insulating layer is silane cross-linked polyethylene insulating material.
3. The multi-layered coordinated flame-retardant cable according to claim 1, characterized in that: The material of the inner lining layer is halogen-free flame-retardant polyolefin sheath material.
4. The multi-layered coordinated flame-retardant cable according to claim 1, characterized in that: The material of the armor wrapping layer is halogen-free low-smoke flame-retardant glass cloth tape.
5. The multi-layered coordinated flame-retardant cable according to claim 1, characterized in that: The material of the outer sheath is halogen-free flame-retardant polyolefin sheath material.
6. A method for preparing a multi-layer coordinated flame-retardant cable, for preparing the multi-layer coordinated flame-retardant cable according to any one of claims 1 to 5, characterized in that: include: Drawing the copper rod into copper monofilament of specified diameter; Twisting multiple drawn copper monofilaments to form a conductor core; Wrap the fire-resistant mica tape tightly around the conductor core to form a fire-resistant layer; The silane cross-linked polyethylene insulation material is melted and evenly wrapped on the fire-resistant layer to form an insulation layer; Arrange multiple conductor cores with insulation layers in a designed manner to form a cable core, fill them with high-temperature resistant filling ropes to form a filling layer, and wrap them with OPP tapes to form a cable wrapping layer; After the cable is formed, a layer of halogen-free flame-retardant polyolefin sheath material is extruded outside the cable core to form an inner lining layer; The galvanized steel strip is wrapped around the inner lining in a double-layer left-hand spiral gap wrapping method to form an armor layer; Wrapping halogen-free low-smoke flame-retardant glass cloth tape outside the armor layer to form an armor wrapping layer; The halogen-free flame-retardant polyolefin sheath material is melted and wrapped around the armor wrapping layer to form an outer sheath to prepare a multi-layer coordinated flame-retardant cable.
7. The method for preparing a multi-layered coordinated flame-retardant cable according to claim 6, wherein: In the steps of twisting multiple drawn copper monofilaments to form a conductor core: The outermost layer of the conductor is twisted in the left direction, and the twisting direction of each layer is opposite from the outside to the inside, and the pitch ratio of the outer layer is smaller than the pitch ratio of the inner layer.
8. The method for preparing a multi-layered flame-retardant cable according to claim 7, wherein: In the step of melting the silane cross-linked polyethylene insulation material and uniformly wrapping it on the fire-resistant layer to form the insulation layer, After the insulation layer is formed, the two ends of the cable are sealed and placed in 90-95°C steam for steam cross-linking.
9. The method for preparing a multi-layered coordinated flame-retardant cable according to claim 8, wherein: The specific steps of wrapping the halogen-free low-smoke flame-retardant glass cloth tape around the armor layer to form the armor wrapping layer include: Two layers of halogen-free, low-smoke, flame-retardant glass cloth tapes are wrapped around the outside of the armor layer at an overlap rate of 10-20%. The wrapping direction is left-handed and tightly wrapped around the armored wire core to form an armor wrapping layer.