CN109972430B - Fracture early warning rope based on carbon nanotube yarn and preparation method thereof - Google Patents
Fracture early warning rope based on carbon nanotube yarn and preparation method thereof Download PDFInfo
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- CN109972430B CN109972430B CN201910328260.4A CN201910328260A CN109972430B CN 109972430 B CN109972430 B CN 109972430B CN 201910328260 A CN201910328260 A CN 201910328260A CN 109972430 B CN109972430 B CN 109972430B
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
- D07B1/147—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising electric conductors or elements for information transfer
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/201—Polyolefins
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2046—Polyamides, e.g. nylons
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2064—Polyurethane resins
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3007—Carbon
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Abstract
The invention discloses a fracture early warning rope based on carbon nanotube yarns and a preparation method thereof, wherein the preparation method comprises the following steps: step 1: twisting the nanotube film after the nanotube film is lapped end to obtain the carbon nanotube conductive yarn; step 2: and (3) taking the carbon nano tube conductive yarn obtained in the step (1) as a strand yarn of the breakage early warning rope or weaving a part of the strand yarn and the rope fiber together to obtain the breakage early warning rope based on the carbon nano tube yarn. Through the real time monitoring to the electrically conductive yarn condition of rupture in the rope, reflect the atress condition of rope to avoid the rope overstretching, play the effect of fracture early warning. The method is simple and easy to realize, is suitable for industrial production, and has wide application prospect in the rope fields of safety ropes, mooring ropes, mountain climbing ropes and the like, and the fields of underwater protective rope nets and the like.
Description
Technical Field
The invention belongs to the field of new materials, and relates to a fracture early warning rope and a preparation method thereof.
Background
The current rope materials mainly fall into two categories, one category is a steel wire rope taking a metal material as a matrix, and the other category is a rope taking organic polymer materials such as high-strength polypropylene, ultrahigh molecular weight polyethylene and the like as the matrix. The carbon fiber composite material rope in the rope taking the organic polymer material as the matrix has incomparable superiority, light weight, high specific strength and specific modulus, corrosion resistance, small linear expansion coefficient in high-temperature and low-temperature environments, and stable and soft performance.
China starts late in the research of the rope net monitoring technology part, but the technology obtains certain achievements in recent years, dawn and the like design a nondestructive flaw detection system of a steel wire rope core based on X-rays, realize the functions of online intelligent identification and analysis of a defect image of the steel wire rope core and the like, and can preliminarily realize the monitoring of the state of the rope net and the fracture detection. With the research and development and popularization of synthetic fiber ropes, signal detectable technology is still infinite, and recently, Li jingzhao et al, on the basis of analyzing relevant research at home and abroad, propose a method and a device for online detecting the integrity of a hollow fiber membrane module based on the principle of a photoresistance method: and judging whether the integrity of the membrane component is damaged or not through the change of the electric signal caused by the change of the light intensity received by the photoresistor detector. A nondestructive testing method for synthetic ropes is proposed: x-ray, terahertz, permanent magnet and electromagnetic analysis were used to decide whether to continue using the rope. Therefore, the mechanical monitoring system has important application in the fields of state monitoring of mooring ropes and mountain-climbing ropes, early warning, recognition, interception of a protective net of a marine ranch and the like.
Disclosure of Invention
The invention aims to design a preparation method of a breakage early warning rope based on novel sensing fibers.
In order to achieve the purpose, the breakage early warning rope based on the carbon nanotube yarn is characterized in that one carbon nanotube conductive yarn or a plurality of carbon nanotube conductive yarns which have different breaking elongations and are not mutually communicated are woven in the breakage early warning rope; the conductive yarn is obtained by lapping and twisting carbon nanotube films end to end;
under the tensile condition, the conductive yarn of the breakage early warning rope is electrified, the resistance change of the conductive yarn of the breakage early warning rope is monitored, the real-time monitoring of the breakage condition of the conductive yarn in the rope reflects the stress condition of the rope, when the resistance of the conductive yarn is changed into infinity, the conductive yarn is broken by pulling, and the rope is stretched by more than or equal to the elongation.
Preferably, when the carbon nanotube conductive yarns are multiple, the difference of the breaking elongation among the carbon nanotube conductive yarns is controlled to be more than 0.5%.
The invention also provides a preparation method of the breakage early warning rope based on the carbon nanotube yarn, which is characterized by comprising the following steps of:
step 1: twisting the nanotube film after the nanotube film is lapped end to obtain the carbon nanotube conductive yarn;
step 2: and (3) taking the carbon nano tube conductive yarn obtained in the step (1) as a strand yarn of the breakage early warning rope or weaving a part of the strand yarn and the rope fiber together to obtain the breakage early warning rope based on the carbon nano tube yarn.
Preferably, the number of the carbon nanotube films in the step 1 is two or more.
Preferably, the thickness of the carbon nanotube film in the step 1 is 5-50 μm, and the width is 0.5-10 cm.
Preferably, the lapping length of the lapping part of the carbon nanotube film in the step 1 is 0.5-10 cm, the twisting twist is 0.1-100/cm, and the twisting angle is 10-70 degrees.
Preferably, the diameter of the carbon nanotube conductive yarn in the step 1 is in the range of 10 μm to 5 mm.
Preferably, the elongation at break of the carbon nanotube conductive yarn in the step 1 is 0.5-10%.
Preferably, the fiber for the rope in the step 2 is industrial fiber or high-performance fiber.
More preferably, the industrial fiber is one or more of polypropylene fiber, chinlon and spandex blended fiber; the high-performance fiber is one or a blended fiber of two of ultra-high molecular weight polyethylene fiber or aramid fiber.
Preferably, the number of the carbon nanotube conductive yarns in the step 2 is 1-50.
More preferably, in the step 2, when the plurality of carbon nanotube conductive yarns are provided, the carbon nanotube conductive yarns are not connected to each other, and the difference of the breaking elongation between the carbon nanotube conductive yarns is controlled to be more than 0.5%.
Preferably, the carbon nanotube conductive yarn is blended with the rope fiber as a part of the strand yarn, and then is knitted together with the rope fiber.
The principle of the invention is as follows:
the carbon nanotube yarn with different diameters can be obtained by regulating the thickness and the width of the carbon nanotube film, and the carbon nanotube conductive yarn with different breaking elongations can be prepared by regulating the twist and the lap length parameters because the lap joint is the weak knot of the carbon nanotube yarn and the strength of the lap joint is determined by the twist and the lap length. When two or more carbon tube films are spliced, the elongation of the conductive yarn is determined by the shortest lap joint.
The early warning ropes with different accuracies are obtained by adjusting the number of the conductive yarns embedded with the carbon nano tubes.
And electrifying the conductive yarn, and testing the resistance condition of the conductive yarn. The rope is stretched at a constant elongation, and when the resistance of a certain conductive yarn becomes infinite, the yarn is broken, so that the relationship between the lap length of the conductive yarn and the breaking elongation of the conductive yarn under the rope specification is obtained.
Whether the conductive yarn is broken or not is deduced by monitoring the resistance change of the conductive yarn of the early warning rope, so that the elongation state of the early warning rope is reflected; under the condition of rope stretching, when the conductive yarn with specific breaking elongation in the rope breaks, the rope is stretched by the elongation which is more than or equal to the breaking elongation, so that the stretching state of the rope is reflected, and the purpose of early warning rope breakage is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the breakage early warning rope obtained by the invention can reflect the elongation condition of the rope in a gradient manner under the condition of not influencing the original mechanical property of the rope, thereby achieving the effect of breakage early warning.
2. The preparation of the carbon nano tube conductive yarn solves the defects of thin diameter and poor weavability of carbon nano tube fibers, and simultaneously can control the diameter of the yarn so as to meet the requirements of different rope conditions.
3. The invention provides conductive yarns with different lap joint lengths, and provides a method for determining the relationship between the lap joint length and the elongation at break, so that the method has strong practicability and meets the actual production requirements of different ropes.
4. The fracture early warning rope obtained by the invention has wide application prospect in the rope fields of safety ropes, mooring ropes, mountain climbing ropes and the like, and the fields of underwater protective rope nets and the like.
5. The preparation method, the principle and the production process provided by the invention are simple and easy to realize, and are suitable for large-scale and industrialized production.
Drawings
FIG. 1 is a schematic view of a carbon nanotube film lapping process according to the present invention; 1 is a carbon nanotube film, and 2 is a lap joint;
FIG. 2 is a schematic view of a lapping process for multiple carbon nanotube films according to the present invention;
FIG. 3 is a cross-sectional view of a break warning rope of example 1; 3 is carbon nano tube conductive yarn, 4 is aramid fiber yarn
FIG. 4 is a side view of the break warning rope of example 1;
FIG. 5 is a cross-sectional view of a break warning rope of example 2; 3 is carbon nano tube conductive yarn, and 5 is ultra-high molecular weight polyethylene fiber.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
The embodiment provides a breakage early warning rope based on carbon nanotube yarns, which comprises the following specific preparation steps:
step 1: preparing the carbon nano tube conductive yarn:
cutting a carbon nanotube film (Teddy nanomaterial Co., Ltd., Suzhou) with a thickness of 15 μm and a purity of 90% into strips with a length of 100cm and a width of 2cm, and overlapping 2 strips, wherein the overlapping length of the overlapping part is 1.5 cm; twisting the yarns with the twist of 5/cm and the twist angle of 30 degrees, fixing the two ends to obtain the carbon nano tube conductive yarns, wherein the diameter of the obtained conductive yarns is 150 mu m;
step 2: and (3) knitting a breakage early warning rope:
combining and weaving 1 6-strand aramid K-129 fiber (produced by DuPont company) with the same diameter of the carbon nano tube conductive yarn obtained in the step 2, preparing and weaving under the condition of ensuring that the conductive yarn is not communicated, and obtaining a breakage early warning rope of the carbon nano tube yarn; the cross-sectional view and the side view of the breakage early warning rope are shown in figures 3-4;
and step 3: determination of the elongation at break of the conductive yarn:
electrifying the conductive yarns of the sample obtained in the step (2), testing the resistance condition of the conductive yarns, stretching the rope at a fixed elongation, and when the resistance of a certain conductive yarn is infinite, showing that the yarn is broken by pulling, thereby obtaining the relationship between the lap length of the conductive yarn and the breaking elongation of the conductive yarn under the rope specification; the elongation at break of the conductive yarn was measured by a tensile tester, and the elongation at break of the yarn was divided by the total length of the yarn to obtain the elongation at break of the yarn, and the elongation at break of the conductive yarn was measured to be about 2.1%.
By monitoring the resistance condition of the conductive yarn, when the resistance of the conductive yarn is infinite, the conductive yarn is broken, and the elongation of the rope is about 2.1%, so that the early warning effect is achieved.
Example 2
The embodiment provides a breakage early warning rope based on carbon nanotube yarns, which comprises the following specific preparation steps:
step 1: preparing the carbon nano tube conductive yarn:
cutting a carbon nanotube film (Teddy nanomaterial Co., Ltd., Suzhou) with the thickness of 10 μm and the purity of 90% into long strips with the length of 100cm and the width of 3cm, and overlapping 8 long strips in pairs respectively, wherein the overlapping lengths of the overlapping parts are 0.5cm, 1cm, 1.5cm and 2cm respectively; twisting with a yarn twist of 10/cm and a twist angle of 20 degrees, fixing the two ends to obtain 4 carbon nanotube conductive yarns with the diameter of 200 μm;
step 2: and (3) knitting a breakage early warning rope:
respectively plying and weaving 10 strands of ultrahigh molecular weight polyethylene fibers (Jiangsu Shenhe technology development Co., Ltd.) with the same diameter with the 4 conductive yarns of the carbon nano tube obtained in the step 2, preparing and weaving under the condition that the conductive yarns are not communicated, and obtaining a fracture early warning rope based on the carbon nano tube yarns; a cross-sectional view of the break warning rope is shown in fig. 5;
and step 3: determination of the elongation at break of the conductive yarn:
electrifying the conductive yarns of the breakage early warning rope obtained in the step (2), testing the resistance condition of the breakage early warning rope, stretching the rope at a fixed elongation, and when the resistance of a certain conductive yarn becomes infinite, showing that the yarn is broken by pulling, so as to obtain the relationship between the lap joint length of the conductive yarn and the breakage elongation of the conductive yarn under the rope specification; the breaking elongation of the conductive yarn is measured by a tensile tester, the elongation of the yarn at break is divided by the total length of the yarn, and the breaking elongation of the yarn is measured to be 1%, 2%, 3% and 4% of the breaking elongation of 4 carbon nanotube conductive yarns.
Through monitoring the resistance condition of each conductive yarn respectively, when the resistance of the conductive yarns with different elongations is infinite, the corresponding conductive yarns are broken, the elongation of the whole rope can be predicted, and therefore the early warning effect is achieved.
Claims (3)
1. A breakage early warning rope based on carbon nanotube yarns is characterized in that one carbon nanotube conductive yarn or a plurality of carbon nanotube conductive yarns which have different breakage elongations and are not mutually communicated are woven in the breakage early warning rope; the breaking elongation of the carbon nano tube conductive yarn is 0.5-10%; the conductive yarn is obtained by lapping and twisting carbon nanotube films end to end;
under the condition of stretching, electrifying the conductive yarn of the breakage early-warning rope, monitoring the resistance change of the conductive yarn of the breakage early-warning rope, monitoring the breakage condition of the conductive yarn in the rope in real time, reflecting the stress condition of the rope, and when the resistance of the conductive yarn is infinite, showing that the conductive yarn is broken, the rope is stretched by the elongation rate which is more than or equal to the elongation rate;
the preparation method of the breakage early warning rope based on the carbon nanotube yarn comprises the following steps:
step 1: twisting the nanotube film after the nanotube film is lapped end to obtain the carbon nanotube conductive yarn; the number of the carbon nanotube films is more than two; the thickness of the carbon nanotube film is 5-50 μm, and the width is 0.5-10 cm; the lapping length of the lapping part of the carbon nanotube film is 0.5-10 cm, the twist is 0.1-100/cm, and the twist angle is 10-70 degrees; the diameter range of the carbon nano tube conductive yarn is 10 mu m-5 mm;
step 2: the carbon nano tube conductive yarn obtained in the step 1 is used as strand yarn of the breakage early warning rope or part of the strand yarn is woven with the fiber for the rope together, and the breakage early warning rope based on the carbon nano tube yarn is obtained; 1-50 carbon nanotube conductive yarns; when the carbon nano tube conductive yarns are multiple, the carbon nano tube conductive yarns are not communicated with each other, and the difference of the breaking elongation of the carbon nano tube conductive yarns is controlled to be more than 0.5%.
2. The carbon nanotube yarn-based breakage warning rope according to claim 1, wherein the fiber for the rope in the step 2 is an industrial fiber or a high-performance fiber; the industrial fiber is one or more of polypropylene fiber, chinlon and spandex; the high-performance fiber is ultra-high molecular weight polyethylene fiber and/or aramid fiber.
3. The breakage warning rope based on carbon nanotube yarn as claimed in claim 1, wherein the carbon nanotube conductive yarn is blended with the rope fiber as a part of the strand yarn, and then is woven together with the rope fiber.
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| CN110725147A (en) * | 2019-11-21 | 2020-01-24 | 山东鲁普科技有限公司 | Annular hollow braided rope flat belt |
| JP6812533B1 (en) * | 2019-12-27 | 2021-01-13 | トクセン工業株式会社 | Manufacturing method for long products made of carbon nanotubes |
| CN114960023B (en) * | 2022-05-30 | 2024-05-03 | 中国人民解放军92228部队 | Safety early warning rope, preparation method and safety early warning mooring system |
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| EP3124986A1 (en) * | 2015-07-31 | 2017-02-01 | Inventio AG | Device for detecting a deterioration state in a suspension member arrangement for an elevator based on ac voltage measurements |
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2019
- 2019-04-23 CN CN201910328260.4A patent/CN109972430B/en active Active
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| JP2003206085A (en) * | 2002-01-15 | 2003-07-22 | Mitsubishi Electric Corp | Rope and elevator using it |
| CN1705789A (en) * | 2002-10-17 | 2005-12-07 | 因温特奥股份公司 | Belt with integrated monitoring |
| CN101676452A (en) * | 2008-09-19 | 2010-03-24 | 清华大学 | Method of producing carbon nano-tube yarn |
| CN102449211A (en) * | 2009-05-27 | 2012-05-09 | 阿克马法国公司 | Multilayer conductive fiber and method for producing the same by coextrusion |
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