CN113611443A - A kind of intrinsically safe control cable and preparation method thereof - Google Patents
A kind of intrinsically safe control cable and preparation method thereof Download PDFInfo
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- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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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
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- 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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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- 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
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
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- 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1895—Internal space filling-up means
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- H—ELECTRICITY
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- 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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Abstract
The invention relates to an intrinsic safety control cable, which comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer, an isolation layer, a fire-resistant layer, a copper sheath shielding layer and an outer protective layer from inside to outside; between the adjacent sinle silk group, it has alkali-free glass fiber rope to fill between sinle silk group and the outer jacket. When the cable is used, the cable has an excellent shielding effect, the shielding layer can play a role in inhibiting electromagnetic waves from being emitted outwards, can serve as a channel of short-circuit current, can play a role in protecting a neutral wire core, and has an antistatic effect so as to avoid combustible and explosive accidents caused by sparks.
Description
Technical Field
The invention relates to the technical field of cables, in particular to an intrinsically safe control cable and a preparation method thereof, and particularly relates to an antistatic and explosion-proof intrinsically safe control cable and a preparation method thereof.
Background
Static electricity is an objective natural phenomenon that occurs in a variety of ways, such as contact, friction, peeling, and the like. Electrostatic protection technologies, such as electrostatic hazard in the electronics industry, semiconductors, petroleum industry, weapons industry, textile industry, rubber industry, and military, seek to reduce losses due to static electricity.
With the rapid development of industrial automation in China, the anti-explosion cable is used as power supply equipment of communication, monitoring, detection, alarm and control systems in the production process, and the application range of the anti-static anti-explosion control cable is continuously expanded.
Meanwhile, along with the expansion of the application range of the cable, the cable is also required to be used in a plurality of high-voltage, high-heat and explosive environments, so that a safety cable which is excellent in antistatic effect and can be explosion-proof and fireproof is urgently needed in the market.
Disclosure of Invention
The invention aims to provide an improved intrinsic safety control cable and a preparation method thereof, the cable has excellent shielding effect through structural improvement, and the multiple shielding structure has comprehensive effect, not only has the function of inhibiting electromagnetic waves from emitting outwards, but also can be used as a channel of short-circuit current, can have the protection function of a neutral wire core, has an antistatic function, and avoids combustible and explosive accidents caused by sparks.
In order to achieve the purpose, the technical scheme of the invention is as follows: an intrinsically safe control cable, characterized in that: the cable comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer, an isolating layer, a fire-resistant layer, a copper sheath shielding layer and an outer sheath from inside to outside; between the adjacent sinle silk group, it has alkali-free glass fiber rope to fill between sinle silk group and the outer jacket.
Preferably, each wire core group is composed of an oxygen-free copper wire and a ceramic polyolefin insulating layer extruded on the surface of the oxygen-free copper wire, the plurality of wire core groups are arranged in the clockwise direction, and the heat insulation layer is wrapped on the outer portion of each wire core group.
Further, the heat insulation layer is formed by wrapping a polyester belt; the fire-resistant layer is a ceramic polyolefin insulating layer with the thickness of 2.5-5 mm.
Furthermore, the copper sheath shielding layer is made of an argon arc welding longitudinally-wrapped copper strip and is in a thread-shaped structure; the outer sheath adopts an antistatic outer sheath, and the thickness of the outer sheath is 1.8-3.5 mm.
A preparation method of an intrinsic safety control cable is characterized by comprising the following steps: the preparation method comprises the following steps: a. manufacturing a wire core group, namely firstly extruding a ceramic polyolefin insulating material on the surface of an oxygen-free copper wire to form a single wire core; b. arranging a plurality of wire core groups in a clockwise direction, assembling a cable, filling alkali-free glass fiber ropes between adjacent wire core groups, and wrapping alkali-free glass fiber belts outside the wire core groups of the cable to enable the cable to be round; c. sequentially wrapping and weaving a shielding layer and a polyester tape isolating layer outside the cabled wire core group; d. a fire-resistant layer is extruded outside the isolation layer, and is made of ceramic polyolefin insulating material and has the thickness of 2.5-5 mm; e. longitudinally wrapping a layer of copper strip outside the fire-resistant layer, performing sealing welding on the copper strip by adopting argon arc welding, and then embossing the copper strip to form a thread shape; f. an antistatic outer sheath is extruded outside the copper sheath shielding layer.
Compared with the prior art, the technical scheme of the invention comprises the improvement of a plurality of details besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:
1. according to the improved scheme, the cable comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer, an isolating layer, a fire-resistant layer, a copper sheath shielding layer and an outer protective layer from inside to outside; alkali-free glass fiber ropes are filled between the adjacent wire core groups and between the wire core groups and the outer protective layer; the shielding layer not only has the function of inhibiting electromagnetic waves from being emitted to the outside, but also can be used as a channel of short-circuit current, can play a role in protecting a neutral wire core, and has an antistatic function so as to avoid combustible and explosive accidents caused by sparks;
2. according to the technical scheme, each wire core group is composed of an oxygen-free copper wire and a ceramic polyolefin insulating layer extruded on the surface of the oxygen-free copper wire, so that the fireproof performance is good, the fire resistance level can reach the A-level standard of GB12666.6, namely the wire core group is burnt in flame at 950-1000 ℃ for 90min, and a 3A fuse is not fused;
3. the invention has simple manufacturing process and high yield, reduces the production cost, improves the working efficiency and is convenient for popularization and utilization;
4. the invention relates to a method for preparing a high-performance composite material. The high-performance intrinsic safety control cable has the safety use performance of interference resistance, fire resistance, radial water resistance, environmental protection, static resistance and explosion prevention.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals:
the composite material comprises an oxygen-free copper wire 1, a ceramic polyolefin insulating layer 2, a heat insulating layer 3, a braided shielding layer 4, an isolating layer 5, a fire-resistant layer 6, a copper sheath shielding layer 7 and an outer sheath 8.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an intrinsic safety control cable, and particularly relates to a control cable shown in a figure 1, which is different from the prior art in that: the cable comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer 4, an isolating layer 5, a fire-resistant layer 6, a copper sheath shielding layer 7 and an outer sheath 8 from inside to outside; between the adjacent sinle silk group, it has alkali-free glass fiber rope to fill between sinle silk group and the outer jacket.
In implementing, arrange a plurality of sinle silk group according to the three-layer, the inlayer sets up a sinle silk group, and the intermediate level sets up 5 sinle silk groups, and the skin sets up 12 sinle silk groups, arranges in proper order and carries out the stranding, packs alkali-free glass fiber rope between adjacent sinle silk group, and the outside parcel alkali-free glass area of group forms the insulating layer at outermost sinle silk. The cable manufactured in the way has excellent shielding effect, the shielding layer not only plays a role in inhibiting electromagnetic waves from emitting outwards, but also can be used as a channel of short-circuit current, the protection effect of a neutral wire core can be played, and meanwhile, the cable has an antistatic effect, and combustible and explosive accidents caused by sparks are avoided.
Example 1
The cable comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer, an isolating layer, a fire-resistant layer, a copper sheath shielding layer and an outer sheath from inside to outside; between the adjacent sinle silk group, it has alkali-free glass fiber rope to fill between sinle silk group and the outer jacket, the silver-plated glass microballon is filled to fill in the alkali-free glass fiber rope here, silver-plated glass microballon is equipped with the silver-plated layer of 0.1 ~ 0.01ohm-cm thick, the electromagnetic shield effect has not only been improved to here adoption hollow silver-plated glass microballon, simultaneously because the setting of microballon, reduced the frictional force between the adjacent sinle silk group and the frictional force between sinle silk group and alkali-free glass fiber rope, make the cable can not locally generate heat, the wearing and tearing is serious in the use, in the process such as rotation, prolonged life.
Preferably, each wire core group is composed of an oxygen-free copper wire 1 and a ceramic polyolefin insulating layer 2 extruded on the surface of the oxygen-free copper wire, a plurality of wire core groups are arranged in the clockwise direction, and a heat insulation layer 3 is wrapped outside the wire core groups. The heat insulation layer is made of ceramic polyolefin insulation material which has excellent insulation performance and volume resistivity more than or equal to 2 multiplied by 1015Omega cm. Under the conditions of 350 plus 1600 ℃ with flame and no flame, the hard armor shell can be fired, the ceramic armor body after the firing is harder at higher temperature for longer time, the residue is a pure ceramic inorganic substance, the ceramic armor body can form compact honeycomb fine micropores in the ablation process, and a layer of ceramic glaze film can be formed on the surface to play a good role in fire resistance, fire blocking, fire prevention,The effects of heat insulation and heat insulation can pass the requirements of spraying and vibration tests of A level at 950-1100 ℃ for more than 180min and the highest CWZ level of BS 6387.
Furthermore, when the heat insulation layer is extruded, the extrusion thickness of the wire core group arranged in the middle layer is increased, the extrusion thickness of the wire core group in the middle layer is increased by 0.05-0.15mm compared with the extrusion thickness of the inner and outer layer wire core layers, and the wear resistance and the protection effect are improved.
Further, in this embodiment, the braided shielding layer may be formed by braiding copper wires with a diameter of 0.2mm, the braiding density is greater than or equal to 80%, the braided shielding layer shields electromagnetic interference on the communication wire core, the shielding layer plays a role in blocking, the core wire is only electromagnetically coupled with the shielding layer, and the distributed capacitance between the shielding layer and an external metal object has no relation to the core wire.
In another embodiment, the braided shielding layer is formed by co-braiding copper wires with the diameter of 0.2mm and silver-plated carbon fibers with the diameter of 0.2mm, wherein the ratio of the copper wires to the silver-plated carbon fibers is 1:0.3, the braiding density is greater than or equal to 80%, and the shielding effect is better when the two materials are braided.
Furthermore, the heat insulation layer is formed by winding a polyester belt; the fire-resistant layer is a ceramic polyolefin insulating layer with the thickness of 2.5-5 mm. The copper sheath shielding layer is made of argon arc welding longitudinally-wrapped copper strips and is in a thread-shaped structure; the outer sheath adopts an antistatic outer sheath, and the thickness of the outer sheath is 1.8-3.5 mm.
Example 2
A preparation method of an intrinsically safe control cable comprises the following steps: a. manufacturing a wire core group, namely extruding a ceramic polyolefin insulating material on the surface of an oxygen-free copper wire to form the wire core group; b. arranging a plurality of wire core groups in a clockwise direction, assembling a cable, filling alkali-free glass fiber ropes between adjacent wire core groups, and wrapping alkali-free glass fiber belts outside the wire core groups of the cable to enable the cable to be round; c. sequentially wrapping and weaving a shielding layer and a polyester tape isolating layer outside the cabled wire core group; d. a fire-resistant layer is extruded outside the isolation layer, and is made of ceramic polyolefin insulating material and has the thickness of 2.5-5 mm; e. longitudinally wrapping a layer of copper strip outside the fire-resistant layer, performing sealing welding on the copper strip by adopting argon arc welding, and then embossing the copper strip to form a thread shape; f. an antistatic outer sheath is extruded outside the copper sheath shielding layer.
Preferably, in the step b, silver-plated glass beads are filled in the alkali-free glass fiber ropes, and each silver-plated glass bead is provided with a silver plating layer of 0.1-0.01 ohm-cm; in the step c, the outer part of the braided shielding layer is coated with a plastic layer, the inner wall of the plastic layer is coated with 3-5 longitudinally arranged superfine carbon black conducting strips, the superfine carbon black conducting strips are coated on the inner wall of the plastic layer by adopting conducting paint made of superfine carbon black powder, the shielding effect reaches more than 50dB, the portable electromagnetic shielding effect is good, the thickness of the braided shielding layer can be reduced, and materials are saved.
And e, adopting a copper strip with the thickness of 0.4-0.6mm as the copper strip, and adopting a sparse-dense-sparse-dense interval mode to form the threaded binding lines on the surface of the copper strip. And f, preparing the antistatic outer sheath by adding an antistatic agent into a polyvinyl chloride resistant or low-smoke halogen-free sheath material.
The cable manufactured by the invention has the following advantages:
1. the excellent shielding effect, the shielding layer both plays the effect of inhibiting the electromagnetic wave and outwards launching, can regard as the passageway of short-circuit current again, can play the guard action of neutral sinle silk, has antistatic effect simultaneously, avoids because of the flammable accident that explodes that the spark arouses.
2. The environment-friendly type: no heavy metal, no toxicity, no smell, no influence on human body and environment; preventing ant and rat bite, and resisting water and oil.
3. The heat insulation performance is good, the heat conductivity coefficient is 0.09W/Mk, particularly, the interior after ablation is uniform honeycomb, and the heat insulation performance has better fire resistance and heat insulation performance.
4. The fireproof performance is excellent, the fire-resistant grade can reach the A-grade standard of GB12666.6, namely the 3A fuse is not fused after being burnt in flame at 950-1000 ℃ for 90 min; the highest level of C W Z of GB 6387 can be achieved, namely C-burning 3H in 950 ℃ flame, W-water spraying, Z-shaking.
5. In conclusion, the high-performance intrinsic safety control cable has the safety use performance of anti-interference, fire resistance, radial water resistance, environmental protection, static resistance and explosion prevention.
Example 3
Firstly, a single wire core group is manufactured, the conductor adopts an oxygen-free copper wire, the specification is 0.5-10mm2, and a type 1, a type 2 or a type 5 conductor can be adopted according to the use condition. Then the surface of the conductor is extruded with ceramic polyolefin insulating material to form a wire core group, the ceramic polyolefin insulating material has excellent insulating property, and the volume resistivity is more than or equal to 2 multiplied by 1015Omega cm. The crusting speed is high, and the crusting is hard; under the conditions of 350-1600 ℃ with flame and no flame, the hard armor shell can be fired, the ceramic armor body after the firing is harder at higher temperature for longer time, the residue is a pure ceramic inorganic substance, the ceramic armor body can form compact cellular fine micropores in the ablation process, a layer of enamel film can be formed on the surface of the ceramic armor body, the effects of good fire resistance, fire blocking, heat insulation and temperature insulation can be achieved, and the requirements of A-level CWZ spraying and vibration tests at 950-1100 ℃ for more than 180min and the highest BS6387 level CWZ can be met. The manufactured wire core groups can be distinguished by numbers or colors.
And then, arranging the wire core groups in a clockwise direction, wherein the outermost layer is twisted in a right direction. And during cabling, alkali-free glass fiber ropes are filled between cable cores, two layers of alkali-free glass belts with the thickness of 0.2mm are wrapped on the outermost cable core group and tightened, so that the cable cores are rounded, and the alkali-free glass fiber ropes and the alkali-free glass belts play a role in heat insulation. And a shielding layer weaving process, wherein copper wires with the diameter of 0.2mm are adopted for weaving shielding, and the weaving density is not less than 80%. The braided shielding layer plays a role in shielding electromagnetic interference borne by the communication wire core, the shielding layer plays a role in blocking, the core wire is only electromagnetically coupled with the shielding layer, and distributed capacitance between the shielding layer and an external metal object has no relation to the core wire.
Then, two layers of polyester tapes with the thickness of 0.05mm are lapped and wrapped outside the woven shielding layer in an overlapping mode, the lapping rate is not less than 20%, and the polyester tapes are used as polyester tape isolating layers. A fire-resistant layer is extruded outside the isolation layer, the fire-resistant layer is made of ceramic polyolefin insulating materials, the thickness of the fire-resistant layer is 3mm, the ceramic polyolefin insulating materials can be self-extinguished without delayed combustion when horizontally combusted, and the oxygen index is more than or equal to 35; under the conditions of 350 plus 1600 ℃ with flame and no flame, the ceramic armor does not melt, drop or fall off, does not cause secondary fire, can be fired into a hard ceramic armor, the harder the ceramic armor fired for a longer time at a higher temperature, the ceramic inorganic substance as the residue, the residual content of the ceramic inorganic substance is more than 80 percent, the ceramic armor can form honeycomb ceramic fine micropores to play a good fire insulation and heat insulation effect, and the excellent flame retardance of the ceramic armor can play a good fire prevention role.
The outer part of the fire-resistant layer is longitudinally wrapped with a layer of copper strip, the copper strip is hermetically welded by argon arc welding, then the copper strip is rolled to form a thread shape, particularly, argon arc welding production equipment is used, the outer part of the fire-resistant layer of the cable core is longitudinally wrapped with a layer of copper strip, and after the argon arc welding longitudinally wraps the copper strip, the thread shape is rolled to enable the cable to be easily bent. The thickness of the copper strip is 0.4 mm-0.6 mm according to the outer diameter of the fire-resistant layer. The copper strip is a red copper strip. After the cable core is coated with the threaded copper pipe, the interference of an internal electric field and an external electric field and a magnetic field can be shielded; the sealing copper pipe can radially block water; thirdly, the copper pipe can be used as a grounding wire to shield static electricity, so that fire caused by leakage current is avoided;
and fourthly, the copper pipe plays a role of an armor layer to protect the cable core.
And finally, extruding and wrapping the antistatic outer sheath outside the copper sheath shielding layer. The outer sheath is extruded on the fireproof layer in an extrusion mode, and the thickness of the outer sheath is 1.8-3.5 mm. According to different requirements, a polyvinyl chloride resistant or low-smoke halogen-free sheath material can be selected, and an antistatic agent is added into the sheath material to prevent electrostatic sparks generated in installation and use. The outer sheath plays a role in protection.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific details set forth herein. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. An intrinsically safe control cable, characterized in that: the cable comprises a plurality of line core groups and an outer protective layer extruded outside the line core groups, wherein the outer protective layer sequentially comprises a braided shielding layer, an isolating layer, a fire-resistant layer, a copper sheath shielding layer and an outer sheath from inside to outside; between the adjacent sinle silk group, it has alkali-free glass fiber rope to fill between sinle silk group and the outer jacket.
2. An intrinsically safe control cable as claimed in claim 1, wherein: each wire core group consists of an anaerobic copper wire and a ceramic polyolefin insulating layer extruded on the surface of the anaerobic copper wire, a plurality of wire core groups are arranged clockwise, and a heat insulation layer is wrapped outside.
3. An intrinsically safe control cable as claimed in claim 1, wherein: the braided shielding layer is formed by weaving copper wires with the diameter of 0.2mm, and the weaving density is more than or equal to 80%.
4. An intrinsically safe control cable as claimed in claim 1, wherein: the braided shielding layer is formed by co-braiding copper wires with the diameter of 0.2mm and silver-plated carbon fibers with the diameter of 0.2mm, and the braiding density is more than or equal to 70%.
5. An intrinsically safe control cable as claimed in claim 1, wherein: the heat insulation layer is formed by winding a polyester belt; the fire-resistant layer is a ceramic polyolefin insulating layer with the thickness of 2.5-5 mm.
6. The intrinsically safe control cable of claim 1, wherein the copper sheath shielding layer is made of argon arc welding longitudinally-wrapped copper strips and is in a thread-like structure; the outer sheath adopts an antistatic outer sheath, and the thickness of the outer sheath is 1.8-3.5 mm.
7. The method of claim 1, wherein the method comprises the steps of: the preparation method comprises the following steps: a. manufacturing a wire core group, namely firstly extruding a ceramic polyolefin insulating material on the surface of an oxygen-free copper wire to form a single wire core; b. arranging a plurality of wire core groups in a clockwise direction, assembling a cable, filling alkali-free glass fiber ropes between adjacent wire core groups, and wrapping alkali-free glass fiber belts outside the wire core groups of the cable to enable the cable to be round; c. sequentially wrapping and weaving a shielding layer and a polyester tape isolating layer outside the cabled wire core group; d. a fire-resistant layer is extruded outside the isolation layer, and is made of ceramic polyolefin insulating material and has the thickness of 2.5-5 mm; e. longitudinally wrapping a layer of copper strip outside the fire-resistant layer, performing sealing welding on the copper strip by adopting argon arc welding, and then embossing the copper strip to form a thread shape; f. an antistatic outer sheath is extruded outside the copper sheath shielding layer.
8. The method of claim 7, wherein the method comprises the steps of: in the step b, silver-plated glass beads are filled in the alkali-free glass fiber ropes; in the step c, the outside of the braided shielding layer is coated with a plastic layer, and the inner wall of the plastic layer is coated with a plurality of longitudinally arranged superfine carbon black conductive strips.
9. The method of claim 7, wherein the method comprises the steps of: and e, adopting a copper strip with the thickness of 0.4-0.6mm as the copper strip, and adopting a sparse-dense-sparse-dense interval mode to form the threaded binding lines on the surface of the copper strip.
10. The method of claim 7, wherein the method comprises the steps of: and f, preparing the antistatic outer sheath by adding an antistatic agent into a polyvinyl chloride resistant or low-smoke halogen-free sheath material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120920855A (en) * | 2025-06-17 | 2025-11-11 | 四川贯达电线电缆科技有限公司 | Argon arc welding machine for fireproof cable production and fireproof cable |
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