CN110556211B - Flame-retardant method for cable protective layer - Google Patents
Flame-retardant method for cable protective layer Download PDFInfo
- Publication number
- CN110556211B CN110556211B CN201910768748.9A CN201910768748A CN110556211B CN 110556211 B CN110556211 B CN 110556211B CN 201910768748 A CN201910768748 A CN 201910768748A CN 110556211 B CN110556211 B CN 110556211B
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- CN
- China
- Prior art keywords
- cable
- flame
- rubber sheet
- protection layer
- protective layer
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Classifications
-
- 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
- H01B13/228—After-treatment
-
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses a flame-retardant method for a cable protective layer, which comprises the following steps: (1) filling of thermal expansion agents and fire extinguishing foams; (2) fixing the rubber sheet; (3) and (6) mounting a protective layer. According to the invention, the flame-retardant layer is further processed, so that the cable protective layer has flame-retardant performance, and the problems that the conventional cable protective layer does not have a flame-retardant effect, an additional flame-retardant layer is required, the overall cost of the cable is increased, the flame-retardant effect of the flame-retardant layer is poor, and the flame-retardant effect is difficult to play a role in flame retardance are solved.
Description
Technical Field
The invention relates to the field of cables, in particular to a flame-retardant method for a cable protective layer.
Background
Cables are generally formed by twisting several or groups of at least two conductors, each group insulated from each other and often twisted around a center, with a highly insulating covering the entire outside. The cable has the characteristics of internal electrification and external insulation.
The existing cable protection layer does not have a flame-retardant effect, and needs to be additionally provided with a flame-retardant layer, so that the overall cost of the cable is increased, and the flame-retardant layer has a poor flame-retardant effect and is difficult to play a flame-retardant role.
Disclosure of Invention
The invention aims to provide a method for flame retarding a cable protective layer so as to solve the technical problem.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method of flame retarding a cable protective layer comprising the steps of:
(1) taking the tubular cable protection layer off the cable, cutting the cable protection layer along the length direction, unfolding and flattening the cable protection layer, marking a plurality of notches on the outer surface of the cable protection layer along the length direction, filling a thermal expansion agent and fire extinguishing foam in the notches, closing the notches, putting the cable protection layer into a flame-retardant coating, uniformly coating the flame-retardant coating on the surface of the cable protection layer, taking out the protection layer, naturally cooling and solidifying, and coating the notches for a second time, so that the thickness of the flame-retardant coating at the notches is larger than that of other parts of the cable protection layer;
(2) pasting a rubber sheet on the inner surface of the cable protection layer along the direction of the groove opening, wherein the rubber sheet is required to completely cover the groove opening, then fixing the rubber sheet on the inner surface of the cable protection layer, and the rubber sheet is required to be a flame-retardant rubber sheet which is arranged in a flame-retardant coating before pasting so as to uniformly coat the flame-retardant coating on the surface;
(3) and (3) enclosing the cable protective layer into a tubular shape, sealing the joint by using the rubber sheet in the step (2), and then sleeving the cable protective layer on the outer side of the cable.
Preferably, in the step (1), the thermal expansion agent is contained in a circular sealing bag to isolate the thermal expansion agent from the fire-extinguishing foam, then the circular sealing bag and the fire-extinguishing foam are contained in a strip-shaped plastic sealing bag to be sealed, and the strip-shaped plastic sealing bag is placed in the notch.
Preferably, in the step (2), the thickness of the rubber sheet is 2 mm.
Preferably, in the step (2), the surface of the rubber sheet is provided with a V-shaped rubber clamping piece along the length direction thereof, the length of the V-shaped rubber clamping piece is the same as that of the rubber sheet, and when the rubber sheet is fixed on the inner surface of the cable protection layer, the V-shaped rubber clamping piece needs to be placed below the notch so as to cover the notch.
Preferably, in the step (2), the rubber sheet is adhered to the inner surface of the cable protective layer by using an adhesive.
Preferably, in the step (3), before the joint is sealed by using the rubber sheet, the joint of the cable protective layer is heated and sealed by using a torch, and then the joint is sealed by using the rubber sheet.
Preferably, the length of the notch is the same as the length of the cable protective layer.
Preferably, the rubber sheet should be the same color as the cable protective layer.
The invention has the beneficial effects that:
1. according to the invention, the flame-retardant layer is further processed, so that the cable protective layer has flame-retardant performance, and the problems that the conventional cable protective layer does not have a flame-retardant effect, an additional flame-retardant layer is required, the overall cost of the cable is increased, the flame-retardant effect of the flame-retardant layer is poor, and the flame-retardant effect is difficult to play a role in flame retardance are solved.
2. The protective layer is provided with a notch, and the sleeve opening is filled with thermal expansion agent and fire extinguishing foam, so that when a certain part of the cable burns, the thermal expansion agent is promoted to expand to prop the notch open, the fire extinguishing foam flows out to extinguish the fire, and the fire is prevented from spreading to other places of the cable.
3. The V-shaped rubber clamping pieces on the rubber sheets can protect the cable when the notch is opened, and the cable is prevented from being exposed in the air directly without protection.
Detailed Description
The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
A method of flame retarding a cable protective layer comprising the steps of:
(1) taking the tubular cable protection layer off the cable, cutting the cable protection layer along the length direction, unfolding and flattening the cable protection layer, marking a plurality of notches on the outer surface of the cable protection layer along the length direction, filling a thermal expansion agent and fire extinguishing foam in the notches, closing the notches, putting the cable protection layer into a flame-retardant coating, uniformly coating the flame-retardant coating on the surface of the cable protection layer, taking out the protection layer, naturally cooling and solidifying, and coating the notches for a second time, so that the thickness of the flame-retardant coating at the notches is larger than that of other parts of the cable protection layer;
in the step (1), the thermal expansion agent is contained in the circular sealing bag to isolate the thermal expansion agent from the fire-extinguishing foam, then the circular sealing bag and the fire-extinguishing foam are contained in the strip-shaped plastic sealing bag to be sealed, and the strip-shaped plastic sealing bag is placed in the notch.
(2) Pasting a rubber sheet on the inner surface of the cable protection layer along the direction of the groove opening, wherein the rubber sheet is required to completely cover the groove opening, then fixing the rubber sheet on the inner surface of the cable protection layer, and the rubber sheet is required to be a flame-retardant rubber sheet which is arranged in a flame-retardant coating before pasting so as to uniformly coat the flame-retardant coating on the surface;
in the step (2), the thickness of the rubber sheet is 2 mm.
In the step (2), the surface of the rubber sheet is provided with a V-shaped rubber clamping piece along the length direction, the length of the V-shaped rubber clamping piece is the same as that of the rubber sheet, and when the rubber sheet is fixed on the inner surface of the cable protection layer, the V-shaped rubber clamping piece needs to be arranged below the notch to cover the notch.
In the step (2), the rubber sheet is adhered to the inner surface of the cable protective layer by using the adhesive.
(3) And (3) enclosing the cable protective layer into a tubular shape, sealing the joint by using the rubber sheet in the step (2), and then sleeving the cable protective layer on the outer side of the cable.
In the step (3), before the joint is sealed by using the rubber sheet, the joint of the cable protective layer needs to be heated and sealed by using a flame thrower, and then the joint is sealed by using the rubber sheet.
The length of the notch is the same as the length of the cable protective layer.
The rubber sheet should be the same color as the cable protection layer.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for flame retarding a cable protective layer is characterized in that: the method comprises the following steps:
(1) taking the tubular cable protection layer off the cable, cutting the cable protection layer along the length direction, unfolding and flattening the cable protection layer, marking a plurality of notches on the outer surface of the cable protection layer along the length direction, filling a thermal expansion agent and fire extinguishing foam in the notches, closing the notches, putting the cable protection layer into a flame-retardant coating, uniformly coating the flame-retardant coating on the surface of the cable protection layer, taking out the protection layer, naturally cooling and solidifying, and coating the notches for a second time, so that the thickness of the flame-retardant coating at the notches is larger than that of other parts of the cable protection layer;
(2) pasting a rubber sheet on the inner surface of the cable protection layer along the direction of the groove opening, wherein the rubber sheet is required to completely cover the groove opening, then fixing the rubber sheet on the inner surface of the cable protection layer, and the rubber sheet is required to be a flame-retardant rubber sheet which is arranged in a flame-retardant coating before pasting so as to uniformly coat the flame-retardant coating on the surface;
(3) enclosing the cable protective layer into a tubular shape, sealing the joint by using the rubber sheet in the step (2), and then sleeving the cable protective layer on the outer side of the cable;
in the step (2), the surface of the rubber sheet is provided with a V-shaped rubber clamping piece along the length direction, the length of the V-shaped rubber clamping piece is the same as that of the rubber sheet, and when the rubber sheet is fixed on the inner surface of the cable protection layer, the V-shaped rubber clamping piece needs to be arranged below the notch to cover the notch.
2. A method of flame retarding a cable shield as set forth in claim 1, wherein: in the step (1), the thermal expansion agent is contained in the circular sealing bag to isolate the thermal expansion agent from the fire extinguishing foam, then the circular sealing bag and the fire extinguishing foam are contained in the strip-shaped plastic sealing bag to be sealed, and the strip-shaped plastic sealing bag is placed in the notch.
3. A method of flame retarding a cable shield as set forth in claim 1, wherein: in the step (2), the thickness of the rubber sheet is 2 mm.
4. A method of flame retarding a cable shield as set forth in claim 1, wherein: in the step (2), the rubber sheet is adhered to the inner surface of the cable protective layer by using the adhesive.
5. A method of flame retarding a cable shield as set forth in claim 1, wherein: in the step (3), before the joint is sealed by using the rubber sheet, the joint of the cable protective layer needs to be heated and sealed by using a flame thrower, and then the joint is sealed by using the rubber sheet.
6. A method of flame retarding a cable shield as set forth in claim 1, wherein: the length of the notch is the same as that of the cable protective layer.
7. A method of flame retarding a cable shield as set forth in claim 1, wherein: the rubber sheet should be the same color as the cable protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910768748.9A CN110556211B (en) | 2019-08-20 | 2019-08-20 | Flame-retardant method for cable protective layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910768748.9A CN110556211B (en) | 2019-08-20 | 2019-08-20 | Flame-retardant method for cable protective layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110556211A CN110556211A (en) | 2019-12-10 |
| CN110556211B true CN110556211B (en) | 2021-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910768748.9A Active CN110556211B (en) | 2019-08-20 | 2019-08-20 | Flame-retardant method for cable protective layer |
Country Status (1)
| Country | Link |
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| CN (1) | CN110556211B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112992414B (en) * | 2021-03-16 | 2022-09-23 | 国家电网有限公司 | Coating cable for preventing fire from longitudinally spreading and expanding |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2848016B1 (en) * | 2002-11-29 | 2005-01-28 | Nexans | FLAME RETARDANT |
| CN206471146U (en) * | 2017-02-24 | 2017-09-05 | 福建成田科技有限公司 | A kind of multi-functional cable with built-in extinguishing chemical structure |
| CN206649911U (en) * | 2017-04-13 | 2017-11-17 | 东莞市大为线缆有限公司 | A kind of polyvinyl chloride insulation flame retardant cable |
| CN208456002U (en) * | 2018-06-29 | 2019-02-01 | 张聪 | A kind of smoking fire-type construction and decoration panel |
| CN109841329A (en) * | 2019-03-28 | 2019-06-04 | 四川鑫电电缆有限公司 | Fire-resisting cable is pressed in new ceramics low bulk isolated form |
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2019
- 2019-08-20 CN CN201910768748.9A patent/CN110556211B/en active Active
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| Publication number | Publication date |
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| CN110556211A (en) | 2019-12-10 |
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Inventor after: Hu Lianhe Inventor after: Zhang Hao Inventor after: Chen Meng Inventor after: Tang Wenliang Inventor before: Hu Lianhe Inventor before: Wang Zeng Inventor before: Xu Jingwei |
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