CN113488271A - Inorganic mineral insulation high-flame-retardant fireproof cable and preparation method thereof - Google Patents
Inorganic mineral insulation high-flame-retardant fireproof cable and preparation method thereof Download PDFInfo
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- CN113488271A CN113488271A CN202110740745.1A CN202110740745A CN113488271A CN 113488271 A CN113488271 A CN 113488271A CN 202110740745 A CN202110740745 A CN 202110740745A CN 113488271 A CN113488271 A CN 113488271A
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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
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/22—Cables including at least one electrical conductor together with optical fibres
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- 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
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- 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
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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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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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
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/005—Power cables including optical transmission elements
Abstract
The invention relates to the technical field of cables, in particular to an inorganic mineral insulated high-flame-retardant fireproof cable and a preparation method thereof, wherein the inorganic mineral insulated high-flame-retardant fireproof cable comprises an optical fiber wire core and a plurality of conductor wire cores; each conductor wire core is tightly attached to the optical fiber wire core, and the plurality of conductor wire cores are uniformly distributed along the circumferential direction of the optical fiber wire core to form a cable core; each conductor wire core comprises a copper conductor and an inner sheath which are sequentially arranged from inside to outside; the optical fiber core comprises a metal corrugated pipe, at least one optical fiber body is arranged in the metal corrugated pipe, and optical fiber ointment is arranged between the optical fiber body and the metal corrugated pipe; the outer side of the cable core is provided with an embossed copper sheath, the outer side of the embossed copper sheath is extruded with an outer sheath, and inorganic mineral powder is filled between the embossed copper sheath and the outer side surface of the cable core. The corrugated copper sheath and the inorganic mineral powder are arranged in the cable, so that a double-layer flame-retardant structure is formed outside the cable core, and the performances of fire prevention, high temperature resistance and high flame retardance of the cable are enhanced.
Description
Technical Field
The invention relates to the technical field of cables, in particular to an inorganic mineral insulating high-flame-retardant fireproof cable and a preparation method thereof.
Background
Patent CN201610843957.1 discloses a photovoltaic cable, which comprises a cable core, at least one insulating layer, a fiber braid layer, at least one heat-insulating flame-retardant layer and at least one sheath layer in sequence from inside to outside; the cable core is of an inner-outer double-layer structure, the inner layer is a cylindrical conductor taking carbon fiber wires as a reinforcing structure, and the outer layer is a wrapping layer made of copper-clad aluminum magnesium alloy materials. The cable is only provided with a heat-insulating flame-retardant layer, and has the problems of poor high-temperature resistance and poor flame retardance.
In the prior art, the photovoltaic power station can be provided with an optical cable for communication besides the cable, and the optical cable and the cable need to be laid separately, so that the cable and the optical cable are laid separately in the prior art, and the cable is messy and inconvenient to construct.
Disclosure of Invention
The invention aims to provide an inorganic mineral insulated high-flame-retardant fireproof cable and a preparation method thereof, aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme: the application provides an inorganic mineral insulated high-flame-retardant fireproof cable which comprises an optical fiber wire core and a plurality of conductor wire cores; each conductor wire core is tightly attached to the optical fiber wire core, and the plurality of conductor wire cores are uniformly distributed along the circumferential direction of the optical fiber wire core to form a cable core; each conductor wire core comprises a copper conductor and an inner sheath which are sequentially arranged from inside to outside; the optical fiber core comprises a metal corrugated pipe, at least one optical fiber body is arranged in the metal corrugated pipe, and optical fiber ointment is arranged between the optical fiber body and the metal corrugated pipe; an embossed copper sheath is arranged on the outer peripheral side of the cable core, an outer sheath is extruded outside the embossed copper sheath, and inorganic mineral powder is filled between the embossed copper sheath and the peripheral side face of the cable core; the inorganic mineral powder is prepared from the following raw materials in parts by weight: 60-70 parts of calcium carbonate, 30-40 parts of silica sol, 15-60 parts of magnesium oxide and 15-60 parts of zinc oxide.
Wherein the weight parts of the magnesium oxide and the zinc oxide are 1:1, 1:2 or 2: 1.
Wherein, the inner sheath and the outer sheath are both polyvinyl chloride sheaths.
The application also provides a preparation method of the inorganic mineral insulating high-flame-retardant fireproof cable, which comprises the following steps of a, preparing an optical fiber wire core, and embossing the metal belt by using an embossing device to form corrugated bulges on the back surface of the metal belt; then coating a layer of optical fiber ointment on the front surface of the metal belt, putting an optical fiber body in the middle of the front surface of the metal belt after coating the optical fiber ointment, putting the optical fiber body in a tube making machine, rolling the optical fiber body into a tube, and finally welding the connected part of the metal belt to prepare an optical fiber core; b, preparing a conductor wire core, taking a copper rod containing 99.97% of oxygen-free copper with the diameter of 8mm, performing large wire drawing machine, medium wire drawing machine, small wire drawing machine and annealing treatment to obtain a annealed copper wire with the diameter of 0.15mm to 0.30mm, and twisting a plurality of annealed copper wires to form a copper conductor, wherein steam is used as protective gas during the treatment of the wire drawing machine, an antioxidant is added into cooling water for annealing treatment, the steam pressure is 1-2 atmospheres, and the annealing temperature is 350 ℃; extruding the prepared copper conductor by an extruder to form an inner sheath, thereby preparing a conductor wire core unit; c, preparing a cable core, wherein at least three conductor wire core units prepared in the step b are distributed along the circumferential direction of the optical fiber wire cores prepared in the step a, and all the conductor wire cores are arranged in parallel, so that the cable core is prepared; d, placing the cable core prepared in the step c on a copper strip, conveying the copper strip with the cable core to a continuous tube making machine, enabling the left side and the right side of the copper strip to bend inwards and be connected through a plurality of pairs of rollers of the continuous tube making machine, and then welding the connected part through a welding mechanism of the tube making machine, so that a copper sheath is formed on the outer peripheral side of the cable core; step e, preparing inorganic mineral powder, namely putting 60-70 parts of calcium carbonate, 30-40 parts of silica sol, 15-60 parts of magnesium oxide and 15-60 parts of zinc oxide into a stirrer for stirring, and then putting the stirred mixture into a crusher for crushing until the particle size of the inorganic mineral powder is 100nm-500 nm; conveying the embossed copper sheath and the cable core to a bidirectional compaction device, and filling inorganic mineral powder between the copper sheath and the cable core by using the bidirectional compaction device; step f, embossing the copper sheath by using an embossing device so as to convert the copper sheath into an embossed copper sheath; and g, forming an outer sheath on the outer side of the embossed copper sheath by using an extruder.
Wherein, in the step a, the thickness of the inner sheath is 0.8mm-3 mm.
Wherein, in step f, the thickness of the inner sheath is 1.2mm-3 mm.
Wherein the ratio of the thickness of the inner sheath to the thickness of the outer sheath is 1: 1-2.
In step e, the bidirectional tap device comprises tap pieces arranged on two sides of the copper sheath, each tap piece is driven by an independent driving device, and the driving device drives the tap pieces to reciprocate and impact the outer side of the cable.
The invention has the beneficial effects that: according to the inorganic mineral insulation high-flame-retardant fireproof cable, the embossing copper sheath and the inorganic mineral powder are arranged in the cable, so that a double-layer flame-retardant structure is formed outside a cable core, the fireproof, high-temperature-resistant and high-flame-retardant performances of the cable are enhanced, the cable can effectively prevent fire, explosion, radiation and super flame retardance, and has good electrical and insulating performances, the direct-current resistance of a conductor meets the requirement of GB/T3956-2008, the finished cable can not be broken down after being subjected to an alternating-current voltage test specified by 3.5kV for 5 minutes, the finished cable can meet the fire-resistant standard requirements of BS6387 and BS8491, the cable can not be broken down after being continuously electrified for 180 minutes under a flame at 950 ℃, the cable can not be broken down after being subjected to water spraying for 15 minutes after being subjected to a flame at 650 ℃, and can not be broken down after being subjected to knocking vibration for 15 minutes under the flame at 950 ℃; in addition, the optical fiber cores are additionally arranged inside the cable, so that the requirements of optical communication and power supply are met, separate laying is not needed, the construction of workers is facilitated, and the problem that the conventional line is messy is solved.
The preparation method of the inorganic mineral insulating high-flame-retardant fireproof cable is simple in preparation method and simple in process, the inorganic mineral powder in the cable is compacted by arranging the bidirectional compaction device through sleeving and welding by using the tube making machine, the structural strength of the cable is improved, the insulating property and the high flame retardance of the cable are further improved, and the prepared cable is good in high flame-retardant property, good in fireproof property and long in service life.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic structural diagram of the inorganic mineral insulated high flame retardant fireproof cable in this embodiment.
Fig. 2 is a schematic diagram of the tapping apparatus in this embodiment.
Fig. 3 is a schematic view of the pipe making machine of the present embodiment.
Fig. 4 is a cross-sectional view taken at a-a in fig. 3.
Description of the drawings: the optical fiber comprises an optical fiber body 11, optical fiber ointment 12, a metal corrugated pipe 13, a copper conductor 21, an inner sheath 22, inorganic mineral powder 31, a corrugated copper sheath 32, an outer sheath 33, a vibrating piece 41, a driving device 42, a copper strip 51, a roller 52 and a welding mechanism 53.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
One embodiment of the inorganic mineral insulated high-flame-retardant fireproof cable and the preparation method thereof is shown in fig. 1, and comprises an optical fiber wire core and a plurality of conductor wire cores; each conductor wire core is tightly attached to the optical fiber wire core, and the plurality of conductor wire cores are uniformly distributed along the circumferential direction of the optical fiber wire core to form a cable core; each conductor wire core comprises a copper conductor 21 and an inner sheath 22 which are arranged from inside to outside in sequence; the optical fiber core comprises a metal corrugated pipe 13, at least one optical fiber body 11 is arranged in the metal corrugated pipe 13, and optical fiber ointment 12 is arranged between the optical fiber body 11 and the metal corrugated pipe 13; an embossed copper sheath 32 is arranged on the outer peripheral side of the cable core, an outer sheath 33 is extruded on the outer side of the embossed copper sheath 32, and inorganic mineral powder 31 is filled between the embossed copper sheath 32 and the outer peripheral side of the cable core; the inorganic mineral powder 31 is prepared from the following raw materials in parts by weight: 65 parts of calcium carbonate, 35 parts of silica sol, 30 parts of magnesium oxide and 30 parts of zinc oxide.
In this example, the weight parts of magnesium oxide and zinc oxide are 1: 1. It should be noted that the flame retardant performance of the cable can be improved to the maximum extent by 1:1 parts by weight of magnesium oxide and zinc oxide.
In this embodiment, the inner sheath 22 and the outer sheath 33 are both polyvinyl chloride sheaths. The polyvinyl chloride sheath has the characteristics of good heat resistance, strong load capacity, no melting, chemical corrosion resistance and high mechanical strength.
In this embodiment, the metal bellows 13 is a stainless steel bellows, which has a long service life and high strength.
According to the inorganic mineral insulation high-flame-retardant fireproof cable, the rolled copper sheath 32 and the inorganic mineral powder 31 are arranged in the cable, so that a double-layer flame-retardant structure is formed outside a cable core, the fireproof, high-temperature-resistant and high-flame-retardant performances of the cable are enhanced, the cable can effectively prevent fire, explosion, radiation and super flame retardance, and has good electrical and insulating performances, the direct-current resistance of a conductor meets the requirement of GB/T3956-2008, the finished cable can not be broken down after being subjected to an alternating-current voltage test specified by 3.5kV for 5 minutes, can meet the fire-resistant standard requirements of BS6387 and BS8491, can not be broken down after being continuously electrified for 180 minutes under a flame at 950 ℃, can not be broken down after being subjected to water spraying for 15 minutes after being subjected to a flame at 650 ℃, and can not be broken down after being subjected to knocking vibration for 15 minutes under the flame at 950 ℃; in addition, the optical fiber cores are additionally arranged inside the cable, so that the requirements of optical communication and power supply are met, separate laying is not needed, the construction of workers is facilitated, and the problem that the conventional line is messy is solved.
The preparation method of the inorganic mineral insulation high-flame-retardant fireproof cable comprises the following steps.
Step a, preparing an optical fiber wire core, namely embossing a metal belt by using an embossing device to form corrugated bulges on the back of the metal belt; and then coating a layer of optical fiber ointment 12 on the front surface of the metal belt, placing an optical fiber body 11 in the middle of the front surface of the metal belt after coating the optical fiber ointment 12, placing the optical fiber body into a tube making machine for rolling into a tube, and finally welding the connected part of the metal belt to prepare the optical fiber wire core.
B, preparing a conductor wire core, taking a copper rod containing 99.97% of oxygen-free copper with the diameter of 8mm, performing large wire drawing machine, medium wire drawing machine, small wire drawing machine and annealing treatment to obtain a annealed copper wire with the diameter of 0.15mm to 0.30mm, and twisting a plurality of annealed copper wires to form a copper conductor 21, wherein steam is used as protective gas during the treatment of the wire drawing machine, an antioxidant is added into cooling water for annealing treatment, the steam pressure is 1-2 atmospheres, and the annealing temperature is 350 ℃; the prepared copper conductor 21 is extruded through an extruder to form an inner sheath 22, thereby preparing a conductor core unit.
And c, preparing a cable core, arranging the conductor wire core units prepared in the step b along the circumferential direction of the optical fiber wire cores prepared in the step a, and arranging the conductor wire cores in parallel, so that the cable core is prepared.
And d, placing the cable core prepared in the step c on a copper strip 51, conveying the copper strip 51 with the cable core to a continuous tube making machine, enabling the left side and the right side of the copper strip 51 to bend inwards and be connected through a plurality of pairs of rollers of the continuous tube making machine, and then welding the connected part through a welding mechanism 53 of the tube making machine, so that a copper sheath is formed on the outer periphery side of the cable core.
Step e, preparing inorganic mineral powder 31, putting 60-70 parts of calcium carbonate, 30-40 parts of silica sol, 15-60 parts of magnesium oxide and 15-60 parts of zinc oxide into a stirrer for stirring, and then putting the stirred mixture into a crusher for crushing until the particle size of the inorganic mineral powder 31 is 100nm-500 nm; the embossed copper sheath 32 and the cable core are conveyed to a bidirectional tapping device, and the inorganic mineral powder 31 is filled between the embossed copper sheath 32 and the cable core by the bidirectional tapping device.
And f, embossing the copper sheath by using an embossing device so as to convert the copper sheath into the embossed copper sheath 32.
And step g, forming the outer sheath 33 on the outer side of the embossed copper sheath 32 by using an extruder.
In this embodiment, in step a, the thickness of the inner sheath 22 is 0.8mm to 3 mm.
In this embodiment, the thickness of inner sheath 22 is 1.2mm to 3mm in step f.
In the present embodiment, the ratio of the thickness of the inner sheath 22 to the thickness of the outer sheath 33 is 1: 1-2.
In step e, referring to fig. 2, the bidirectional tap device comprises tap pieces 41 disposed on both sides of the copper sheath, each tap piece 41 is driven by a separate driving device 42, and the driving device 42 drives the tap piece 41 to reciprocate and strike the outer side of the cable. Through set up the plain bumper 41 in two different directions, two plain bumper 41 carry out the tap to the copper sheathing from the direction of difference, carry out the tap through setting up two-way tap device to the inorganic mineral substance powder in the cable, improved the structural strength of cable, further promote the insulating properties and the high flame retardant property of cable.
In step d, with reference to fig. 3 and 4, the tube making machine includes a plurality of pairs of rollers 52 and a welding mechanism 53, the copper strip 51 is gradually made into a copper tube by the plurality of pairs of rollers 52, and then the copper strip 51 is welded and fixed by the welding mechanism 53.
The preparation method of the inorganic mineral insulating high-flame-retardant fireproof cable is simple in preparation method and simple in process, the inorganic mineral powder in the cable is compacted by the aid of the bidirectional compacting device through sleeving and welding of the tube making machine, structural strength of the cable is improved, insulating property and high flame retardance of the cable are further improved, and the prepared cable is good in high flame retardance, good in fireproof performance and long in service life.
Example 2
In the second inorganic mineral insulated high flame retardant fireproof cable of the present application, the main technical solution of this embodiment is the same as that of embodiment 1, and the characteristics that are not explained in this embodiment adopt the explanation in embodiment 1, which is not described herein again. This example differs from example 1 in that: the inorganic mineral powder 31 is prepared from the following raw materials in parts by weight: 60 parts of calcium carbonate, 30 parts of silica sol, 15 parts of magnesium oxide and 15 parts of zinc oxide.
Example 3
In the third inorganic mineral insulated high flame retardant fireproof cable of the present application, the main technical solution of this embodiment is the same as that of embodiment 1, and the characteristics that are not explained in this embodiment adopt the explanations in embodiment 1, which are not described herein again. This example differs from example 1 in that: the inorganic mineral powder 31 is prepared from the following raw materials in parts by weight: 70 parts of calcium carbonate, 40 parts of silica sol, 60 parts of magnesium oxide and 30 parts of zinc oxide.
Example 4
Fourth, the main technical solution of this embodiment is the same as that of embodiment 1, and the characteristics that are not explained in this embodiment adopt the explanation in embodiment 1, and are not described herein again. This example differs from example 1 in that: the inorganic mineral powder 31 is prepared from the following raw materials in parts by weight: 68 parts of calcium carbonate, 36 parts of silica sol, 30 parts of magnesium oxide and 60 parts of zinc oxide.
Combining examples 1 to 4 and the existing conventional cable, the high temperature resistance test comparison is performed under the working environment with the rated alternating voltage U0/U of 0.6/1kV, and the specific table is as follows:
according to the inorganic mineral insulation high-flame-retardant fireproof cable, the rolled copper sheath 32 and the inorganic mineral powder 31 are arranged in the cable, so that a double-layer flame-retardant structure is formed outside a cable core, the fireproof, high-temperature-resistant and high-flame-retardant performances of the cable are enhanced, the cable can effectively prevent fire, explosion, radiation and super flame retardance, and has good electrical and insulating performances, the direct-current resistance of a conductor meets the requirement of GB/T3956-2008, the finished cable can not be broken down after being subjected to an alternating-current voltage test specified by 3.5kV for 5 minutes, can meet the fire-resistant standard requirements of BS6387 and BS8491, can not be broken down after being continuously electrified for 180 minutes under a flame at 950 ℃, can not be broken down after being subjected to water spraying for 15 minutes after being subjected to a flame at 650 ℃, and can not be broken down after being subjected to knocking vibration for 15 minutes under the flame at 950 ℃; in addition, the optical fiber cores are additionally arranged inside the cable, so that the requirements of optical communication and power supply are met, separate laying is not needed, the construction of workers is facilitated, and the problem that the conventional line is messy is solved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a high fire-retardant fireproof cable of inorganic mineral insulation which characterized in that: the optical fiber cable comprises an optical fiber core and a plurality of conductor cores;
each conductor wire core is tightly attached to the optical fiber wire core, and a plurality of conductor wire cores are uniformly distributed along the circumferential direction of the optical fiber wire core to form a cable core;
each conductor wire core comprises a copper conductor and an inner sheath which are sequentially arranged from inside to outside;
the optical fiber cable core comprises a metal corrugated pipe, at least one optical fiber body is arranged in the metal corrugated pipe, and optical fiber ointment is arranged between the optical fiber body and the metal corrugated pipe;
an embossed copper sheath is arranged on the outer peripheral side of the cable core, an outer sheath is extruded outside the embossed copper sheath, and inorganic mineral powder is filled between the embossed copper sheath and the peripheral side face of the cable core;
the inorganic mineral powder is prepared from the following raw materials in parts by weight: 60-70 parts of calcium carbonate, 30-40 parts of silica sol, 15-60 parts of magnesium oxide and 15-60 parts of zinc oxide.
2. The inorganic mineral insulated high flame retardant fireproof cable of claim 1, wherein: the weight parts of the magnesium oxide and the zinc oxide are 1:1, 1:2 or 2: 1.
3. The inorganic mineral insulated high flame retardant fireproof cable of claim 1, wherein: the inner sheath and the outer sheath are both polyvinyl chloride sheaths.
4. A preparation method of an inorganic mineral insulation high-flame-retardant fireproof cable is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step a, preparing an optical fiber wire core, namely embossing a metal belt by using an embossing device to form corrugated bulges on the back of the metal belt; then coating a layer of optical fiber ointment on the front surface of the metal belt, putting an optical fiber body in the middle of the front surface of the metal belt after coating the optical fiber ointment, putting the optical fiber body in a tube making machine, rolling the optical fiber body into a tube, and finally welding the connected part of the metal belt to prepare an optical fiber core;
b, preparing a conductor wire core, taking a copper rod containing 99.97% of oxygen-free copper with the diameter of 8mm, performing large wire drawing machine, medium wire drawing machine, small wire drawing machine and annealing treatment to obtain a annealed copper wire with the diameter of 0.15mm to 0.30mm, and twisting a plurality of annealed copper wires to form a copper conductor, wherein steam is used as protective gas during the treatment of the wire drawing machine, an antioxidant is added into cooling water for annealing treatment, the steam pressure is 1-2 atmospheres, and the annealing temperature is 350 ℃; extruding the prepared copper conductor by an extruder to form an inner sheath, thereby preparing a conductor wire core unit;
c, preparing a cable core, wherein at least three conductor wire core units prepared in the step b are distributed along the circumferential direction of the optical fiber wire cores prepared in the step a, and all the conductor wire cores are arranged in parallel, so that the cable core is prepared;
d, placing the cable core prepared in the step c on a copper strip, conveying the copper strip with the cable core to a continuous tube making machine, enabling the left side and the right side of the copper strip to bend inwards and be connected through a plurality of pairs of rollers of the continuous tube making machine, and then welding the connected part through a welding mechanism of the tube making machine, so that a copper sheath is formed on the outer peripheral side of the cable core;
step e, preparing inorganic mineral powder, namely putting 60-70 parts of calcium carbonate, 30-40 parts of silica sol, 15-60 parts of magnesium oxide and 15-60 parts of zinc oxide into a stirrer for stirring, and then putting the stirred mixture into a crusher for crushing until the particle size of the inorganic mineral powder is 100nm-500 nm; conveying the embossed copper sheath and the cable core to a bidirectional compaction device, and filling inorganic mineral powder between the copper sheath and the cable core by using the bidirectional compaction device;
step f, embossing the copper sheath by using an embossing device so as to convert the copper sheath into an embossed copper sheath;
and g, forming an outer sheath on the outer side of the embossed copper sheath by using an extruder.
5. The method for preparing the inorganic mineral insulation high flame-retardant fireproof cable according to claim 4, wherein the method comprises the following steps: in step a, the thickness of the inner sheath is 0.8mm-3 mm.
6. The method for preparing the inorganic mineral insulation high flame-retardant fireproof cable according to claim 5, wherein the method comprises the following steps: in step f, the thickness of the inner sheath is 1.2mm-3 mm.
7. The method for preparing the inorganic mineral insulation high flame-retardant fireproof cable according to claim 6, wherein the method comprises the following steps: the ratio of the thickness of the inner sheath to the thickness of the outer sheath is 1: 1-2.
8. The method for preparing the inorganic mineral insulation high flame-retardant fireproof cable according to claim 4, wherein the method comprises the following steps: in step e, the bidirectional tap device comprises tap pieces arranged on two sides of the copper sheath, each tap piece is driven by an independent driving device, and the driving device drives the tap pieces to reciprocate and impact the outer side of the cable.
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| CN102270526A (en) * | 2011-07-27 | 2011-12-07 | 江苏南瑞淮胜电缆有限公司 | Fiber compound insulated power cable |
| CN202422829U (en) * | 2012-02-16 | 2012-09-05 | 沈阳鹏程电缆有限公司 | Outer protecting bush fireproof cable of corrugation copper pipe |
| CN103102134A (en) * | 2013-02-20 | 2013-05-15 | 上海宏胜电线电缆有限公司 | Fireproof and flame retardant mineral compound filling material and cable containing the same |
| CN203386504U (en) * | 2013-06-26 | 2014-01-08 | 开开电缆科技有限公司 | Mineral insulated flexible fire-proof cable |
| WO2015026067A1 (en) * | 2013-08-22 | 2015-02-26 | 엘에스전선 주식회사 | Hdmi cable comprising optical fiber unit |
| CN103903678A (en) * | 2014-03-01 | 2014-07-02 | 安徽中通电缆科技有限公司 | Electronic control combination cable for equipment |
| CN105845213A (en) * | 2016-03-17 | 2016-08-10 | 人民电缆集团有限公司 | Novel corrosion-resistance flexible fireproof photoelectric composite cable |
| KR102051973B1 (en) * | 2018-11-19 | 2019-12-04 | 주식회사 티엠씨 | Optical fiber and power line composite cable |
| CN209400753U (en) * | 2018-12-26 | 2019-09-17 | 通鼎互联信息股份有限公司 | A kind of high fire-retardance mouse bite preventing central tube type optical cable |
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Application publication date: 20211008 |