CN114141438B - Preparation method of heat-insulating mineral fireproof cable - Google Patents
Preparation method of heat-insulating mineral fireproof cable Download PDFInfo
- Publication number
- CN114141438B CN114141438B CN202111290101.3A CN202111290101A CN114141438B CN 114141438 B CN114141438 B CN 114141438B CN 202111290101 A CN202111290101 A CN 202111290101A CN 114141438 B CN114141438 B CN 114141438B
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- Prior art keywords
- layer
- elastic supporting
- sheath
- insulating
- mineral
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Classifications
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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
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating 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
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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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
- 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
- H01B7/187—Sheaths comprising extruded non-metallic 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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
- Manufacturing Of Electric Cables (AREA)
Abstract
The invention discloses a preparation method of a heat-insulating mineral fireproof cable, which is used for producing the heat-insulating mineral fireproof cable and comprises the following steps: s1, producing a cable core; s2, arranging a copper sheath outside the cable core; s3, pouring magnesia powder into the insulating layer of mineral substance; s4, extruding and molding an elastic supporting layer outside the copper sheath; s5, a sheath layer is arranged outside the elastic supporting layer. The cable manufactured by the manufacturing method is provided with the elastic supporting layer and the mineral insulating layer, the arrangement of the mineral insulating layer can ensure better insulating fireproof performance, the elastic supporting layer can absorb physical impact, better physical protective performance is ensured, and the defects of the traditional structure are overcome.
Description
Technical Field
The invention relates to a cable production process, in particular to a preparation method of a heat-insulating mineral fireproof cable.
Background
The mineral cable is called as a mineral insulated cable, has the advantages of high fire resistance, explosion-proof property, corrosion resistance, long service life and the like, and has important positive significance for fire prevention. The cross-section structure of mineral cables on the market at present mainly comprises a cable core, a mineral insulating layer and a sheath, and has good insulating fireproof performance, but has poor physical protective performance, poor physical impact resistance and easy damage.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a preparation method of the heat-insulating mineral fireproof cable, which has both the insulating fireproof performance and the physical protective performance.
According to the preparation method of the heat-insulating mineral fireproof cable, which is disclosed by the embodiment of the invention, the heat-insulating mineral fireproof cable is used for producing the heat-insulating mineral fireproof cable, and comprises a cable core, a mineral insulating layer, a copper sheath, an elastic supporting layer and a sheath layer from inside to outside, wherein a plurality of elastic supporting parts are circumferentially arranged on the elastic supporting layer, and the sheath layer is supported by the elastic supporting parts, so that a plurality of deformation cavities are formed between the copper sheath and the sheath layer; the preparation method comprises the following steps:
s1, producing a cable core;
s2, arranging a copper sheath outside the cable core;
s3, pouring magnesia powder into the insulating layer of mineral substance;
s4, extruding and molding an elastic supporting layer outside the copper sheath;
s5, a sheath layer is arranged outside the elastic supporting layer.
According to the embodiment of the invention, at least the following technical effects are achieved:
the cable manufactured by the manufacturing method is provided with the elastic supporting layer and the mineral insulating layer, the arrangement of the mineral insulating layer can ensure better insulating fireproof performance, the elastic supporting layer can absorb physical impact, better physical protective performance is ensured, and the defects of the traditional structure are overcome.
According to some embodiments of the invention, the resilient support is left-handed or right-handed relative to the cable core.
According to some embodiments of the present invention, the elastic supporting portion is provided with a first layer of elastic supporting portion, a circumferential supporting layer, and a second layer of elastic supporting portion in sequence from inside to outside, the rotation directions of the first layer of elastic supporting portion and the second layer of elastic supporting portion are opposite, and the circumferential supporting layer is disposed between the first layer of elastic supporting portion and the second layer of elastic supporting portion along the circumferential direction of the cable core.
According to some embodiments of the invention, in step S4, the first layer of elastic support is extruded first, the circumferential support layer is extruded after the first layer of elastic support is shaped, and the second layer of elastic support is extruded after the circumferential support layer is shaped.
According to some embodiments of the invention, the first layer of elastic support and the second layer of elastic support are distributed with circumferential misalignment.
According to the inventionIn some embodiments, the magnesia powder compact density is greater than or equal to 3.5g/cm 3 。
According to some embodiments of the invention, the surface of the sheath layer is provided with a plurality of mounting rings along the length direction, each mounting ring is uniformly provided with a plurality of convex parts along the circumferential direction of the sheath layer, and the preparation method further comprises S6 hot-press molding the mounting rings on the surface of the sheath layer.
According to some embodiments of the invention, the sheath layer is formed by extrusion molding, and in step S6, the mounting ring is formed by pressing during cooling and shaping of the sheath layer.
According to some embodiments of the invention, the sheath layer is a halogen-free crosslinked irradiated polyethylene layer.
According to some embodiments of the invention, the elastic support layer is made of TPU polyurethane, crosslinked polyethylene, or insulating polyvinyl chloride.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic cross-sectional view of a cable produced in accordance with the present invention;
fig. 3 is a schematic view of a construction of the mounting ring and the adjusting ring.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 3, the present invention provides a method for manufacturing a heat-insulating type mineral substance fireproof cable for manufacturing the heat-insulating type mineral substance fireproof cable, wherein the heat-insulating type mineral substance fireproof cable comprises a cable core 100, a mineral substance insulating layer 200, a copper sheath 400, an elastic supporting layer 300 and a sheath layer 500 from inside to outside, the elastic supporting layer 300 is circumferentially provided with a plurality of elastic supporting parts, the sheath layer 500 is supported by the elastic supporting parts, and a plurality of deformation cavities are formed between the copper sheath 400 and the sheath layer 500;
the preparation method comprises the following steps:
s1, producing a cable core 100;
s2, arranging a copper sheath 400 outside the cable core 100;
s3, pouring magnesium oxide powder to prepare a mineral insulating layer 200;
s4, extruding and molding the elastic support layer 300 outside the copper sheath 400;
s5, the sheath layer 500 is provided outside the elastic support layer 300.
The cable manufactured by the manufacturing method is provided with the elastic supporting layer 300 and the mineral insulating layer 200, the arrangement of the mineral insulating layer 200 can ensure good insulating fireproof performance, the elastic supporting layer 300 can absorb physical impact, good physical protective performance is ensured, and the defects of the traditional structure are overcome.
In view of the fact that the cable may twist during the bending of the cable, in order to avoid affecting the cable core 100, the elastic support portion is configured to be in a left-handed or right-handed structure with respect to the cable core 100, so that the sheath layer 500 can also twist a certain angle with respect to the cable core 100 while absorbing the impact through deformation of the elastic support portion, thereby avoiding twisting of the cable core 100 or relieving the twisting degree of the cable core 100.
Specifically, in some embodiments of the present invention, the elastic supporting portion is sequentially provided with a first layer of elastic supporting portion 301, a circumferential supporting layer 302, and a second layer of elastic supporting portion 303 from inside to outside, the rotation directions of the first layer of elastic supporting portion 301 and the second layer of elastic supporting portion 303 are opposite, and the circumferential supporting layer 302 is disposed between the first layer of elastic supporting portion 301 and the second layer of elastic supporting portion 303 along the circumferential direction of the cable core 100. The provision of the circumferential support layer 302 can effectively secure the strength of the first layer elastic support portion 301 and the second layer elastic support portion 303.
With respect to the above structure, in step S4, the first layer elastic supporting portion 301 is extruded and molded, the circumferential supporting layer 302 is extruded and molded after the first layer elastic supporting portion 301 is shaped, and the second layer elastic supporting portion 303 is extruded and molded after the circumferential supporting layer 302 is shaped. Thereby ensuring a better molding effect.
In practical arrangement, the first layer elastic supporting portion 301 and the second layer elastic supporting portion 303 are preferably distributed in a staggered manner in the circumferential direction, so as to avoid mutual influence of left-handed and right-handed structures.
In some embodiments of the invention, the magnesia powderCompacting the mixture to a density of 3.5g/cm or higher 3 . The pouring of the magnesium oxide powder can be carried out using equipment/techniques known in the art, and the invention does not improve the pouring process, equipment, and is therefore not described in any great detail. Similarly, the arrangement of the copper sheath 400 is also selected according to the actual situation.
In some embodiments of the present invention, the surface of the sheath layer 500 is provided with a plurality of mounting rings along the length direction, each mounting ring is uniformly provided with a plurality of protrusions 600 along the circumferential direction of the sheath layer 500, and the preparation method further includes S6 hot-press molding the mounting rings on the surface of the sheath layer 500. The mounting ring may be formed by forming a plurality of mounting rings on the surface of the sheath 500, which can be used to mount in an angularly fixed manner with a suitably adapted clip-type structure. The cable fixing device can be used for fixing during single-wire wiring and can also be used for fixing two cables side by side during multi-wire wiring.
Specifically, only one adjusting ring 700 needs to be arranged, the adjusting ring 700 comprises a semicircular first clamp and a semicircular second clamp, a clamping port 701 matched with the convex part 600 is formed in the first clamp and the second clamp, wing plates 702 are arranged at two ends of the first clamp and the second clamp, and mounting holes 703 are formed in the wing plates 702. When the cable is installed, the same cable can be clamped with the adjusting rings 700 on the two mounting rings, and the angle of the sheath layer 500 can be changed when the mounting holes 703 are penetrated and fixed by the screws by changing the positions of the wing plates 702 on the two adjusting rings 700, so that the cable is twisted. When a plurality of cables are arranged side by side, the wing plates 702 on the two cables can be controlled to coincide, and then screws are penetrated for fixing, so that side by side fixing is realized.
In some embodiments of the present invention, the sheath 500 is formed by extrusion molding, and in step S6, the sheath 500 is pressed to form a mounting ring during cooling and shaping.
Specifically, the sheath layer 500 is a halogen-free crosslinked irradiation polyethylene layer, and the elastic support layer 300 is made of TPU polyurethane, crosslinked polyethylene or insulating polyvinyl chloride.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the heat-insulating mineral fireproof cable is characterized by comprising a cable core, a mineral insulating layer, a copper sheath, an elastic supporting layer and a sheath layer from inside to outside, wherein the elastic supporting layer is circumferentially provided with a plurality of elastic supporting parts, and the sheath layer is supported by the elastic supporting parts so as to form a plurality of deformation cavities between the copper sheath and the sheath layer; the preparation method comprises the following steps:
s1, producing a cable core;
s2, arranging a copper sheath outside the cable core;
s3, pouring magnesia powder into the insulating layer of mineral substance;
s4, extruding and molding an elastic supporting layer outside the copper sheath;
s5, a sheath layer is arranged outside the elastic supporting layer.
2. The method of making a insulated mineral insulated fire cable of claim 1, wherein the resilient support is left-handed or right-handed relative to the cable core.
3. The method for manufacturing a heat-insulating mineral fireproof cable according to claim 2, wherein the elastic supporting portion is provided with a first layer of elastic supporting portion, a circumferential supporting layer and a second layer of elastic supporting portion in sequence from inside to outside, the rotation directions of the first layer of elastic supporting portion and the second layer of elastic supporting portion are opposite, and the circumferential supporting layer is arranged between the first layer of elastic supporting portion and the second layer of elastic supporting portion along the circumferential direction of the cable core.
4. A method of manufacturing a heat-insulating mineral fireproof cable according to claim 3, wherein in step S4, the first layer of elastic support portion is extruded and molded, the circumferential support layer is extruded and molded after the first layer of elastic support portion is shaped, and the second layer of elastic support portion is extruded and molded after the circumferential support layer is shaped.
5. The method of manufacturing a insulated mineral insulated fire protection cable of claim 4, wherein the first layer of elastic support and the second layer of elastic support are circumferentially offset.
6. The method for producing a heat-insulating mineral fireproof cable according to claim 1, wherein the magnesia powder compacted density is 3.5g/cm or more 3 。
7. The method for manufacturing a heat-insulating mineral fireproof cable according to claim 1, wherein a plurality of mounting rings are provided on the surface of the sheath layer in the longitudinal direction, each mounting ring is uniformly provided with a plurality of protrusions in the circumferential direction of the sheath layer, and the method further comprises S6 of hot-press molding the mounting rings on the surface of the sheath layer.
8. The method of manufacturing a heat-insulating mineral insulated fireproof cable according to claim 7, wherein the sheath layer is formed by extrusion molding, and the mounting ring is formed by pressing the sheath layer during cooling and shaping in step S6.
9. The method for preparing a heat-insulating mineral fireproof cable according to claim 8, wherein the sheath layer is a halogen-free crosslinked irradiation polyethylene layer.
10. The method for preparing a heat-insulating mineral fireproof cable according to claim 1, wherein the elastic supporting layer is made of TPU polyurethane, crosslinked polyethylene or insulating polyvinyl chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111290101.3A CN114141438B (en) | 2021-11-02 | 2021-11-02 | Preparation method of heat-insulating mineral fireproof cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111290101.3A CN114141438B (en) | 2021-11-02 | 2021-11-02 | Preparation method of heat-insulating mineral fireproof cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114141438A CN114141438A (en) | 2022-03-04 |
| CN114141438B true CN114141438B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111290101.3A Active CN114141438B (en) | 2021-11-02 | 2021-11-02 | Preparation method of heat-insulating mineral fireproof cable |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205984354U (en) * | 2016-07-15 | 2017-02-22 | 天津市元九科技有限责任公司 | Under -ground cable |
| KR20170064246A (en) * | 2015-12-01 | 2017-06-09 | 엘에스전선 주식회사 | High fire-resistant cable |
| CN209357498U (en) * | 2019-03-13 | 2019-09-06 | 安徽天康(集团)股份有限公司 | A kind of mica tape mineral insulation ripple copper sheath cable |
| CN110993169A (en) * | 2019-11-20 | 2020-04-10 | 湖南华泰电缆有限公司 | Fireproof cable and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005001670B3 (en) * | 2005-01-13 | 2006-08-24 | CCS Technology, Inc., Wilmington | Fire-resistant cable and method of making such a cable |
| EP3540487A1 (en) * | 2018-03-12 | 2019-09-18 | Corning Research & Development Corporation | Optical fiber cable with improved fire protection performance |
-
2021
- 2021-11-02 CN CN202111290101.3A patent/CN114141438B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170064246A (en) * | 2015-12-01 | 2017-06-09 | 엘에스전선 주식회사 | High fire-resistant cable |
| CN205984354U (en) * | 2016-07-15 | 2017-02-22 | 天津市元九科技有限责任公司 | Under -ground cable |
| CN209357498U (en) * | 2019-03-13 | 2019-09-06 | 安徽天康(集团)股份有限公司 | A kind of mica tape mineral insulation ripple copper sheath cable |
| CN110993169A (en) * | 2019-11-20 | 2020-04-10 | 湖南华泰电缆有限公司 | Fireproof cable and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN114141438A (en) | 2022-03-04 |
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