CN109795840B - Aramid fiber double-layer ring network conveyer belt and preparation method thereof - Google Patents
Aramid fiber double-layer ring network conveyer belt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an aramid fiber double-layer looped network conveying belt which comprises a framework, wherein an adhesive layer is rolled between the frameworks, an upper covering adhesive layer and a lower covering adhesive layer are connected through the adhesive layer, the framework comprises two layers of connecting shafts which are arranged in parallel, aramid fiber monofilaments are wound between two adjacent connecting shafts in the horizontal direction to form a single ring I in a spiral annular structure, the aramid fiber monofilaments are wound between two adjacent connecting shafts in the vertical direction to form a single ring II in an 8-shaped structure, and the single ring I and the single ring II are alternately arranged. A preparation method of an aramid fiber double-layer looped network conveying belt comprises the following steps: (1) preparing aramid monofilaments; (2) preparing an aramid fiber double-layer ring network framework; (3) preparing an aramid double-layer ring network rubber core; (4) adhering upper and lower covering glues; (5) and (4) vulcanizing. The aramid fiber double-layer ring net conveyor belt produced by adopting the structure and the preparation method thereof has the advantages of stable structure, high tensile strength, wear resistance, creep resistance, good water absorption and the like.
Description
Technical Field
The invention belongs to the technical field of conveyer belt preparation methods, and particularly relates to an aramid fiber double-layer ring net conveyer belt and a preparation method thereof.
Background
The prior conveying belt products mainly comprise a steel wire spiral net conveying belt and a polyester spiral net conveying belt. The overall breaking strength of the steel wire spiral net conveying belt can reach 630-1200N, and the steel wire spiral net conveying belt is mainly used for conveying a first line and a second line in steel plant sintering. However, the dead weight is too large, the normal transportation of the material can be ensured only by increasing larger kinetic energy of a transmission system, and the operation stability is poorer, so the material conveying device cannot be popularized in the occasions with small transportation amount or small specific gravity of the transported material. In addition, the production process of the steel wire spiral net is relatively complex, the production process comprises steel wire selection, steel spring manufacturing, manual threading, shaft spring fixing, steel spring flattening and coiling, the quality of the product is affected by the change of any process, and the stability of the product is poor. The single-layer breaking strength of the polyester spiral net does not exceed 2300N/cm, and the thickness of the polyester spiral net reaches 3mm, so that the requirement on the integral breaking strength of a conventional conveying belt product cannot be met.
The aramid fiber has limit oxygen index greater than 28%, and is fire-retardant fiber, so that it will not burn in air, will not support combustion and has self-extinguishing property. The strength of the aramid monofilaments with the same diameter is 5-6 times that of the steel wire, the toughness of the aramid monofilaments is 2 times that of the steel wire, and the aramid monofilaments also have great advantages in yield resistance and flexibility; in the aspect of heat conductivity coefficient, the heat conductivity of the aramid fiber is much lower than that of a steel wire rope, so that the heat aging of rubber can be effectively reduced, and the vulcanized rubber can keep the mechanical property for a longer time. The aramid fiber is not decomposed or melted at the temperature of 560 ℃, and is very suitable for producing the framework layer of the heat-resistant conveyer belt. However, aramid is a material consisting of highly oriented crystalline domains without amorphous regions; due to steric hindrance of a large benzene ring in a molecular chain segment, an amide group is difficult to react with other atoms or groups and has chemical inertness, so that the adhesion between the aramid monofilament and rubber plastic is poor.
Disclosure of Invention
The invention aims to provide an aramid fiber double-layer ring network conveyer belt and a preparation method thereof, and solves the problems of large self weight, low breaking strength, poor adhesion of aramid fiber and rubber and production and preparation of the aramid fiber double-layer ring network conveyer belt.
In order to achieve the purpose, the invention provides an aramid fiber double-layer ring network conveying belt which comprises a framework, wherein an adhesive glue layer is rolled between the frameworks, an upper covering glue layer and a lower covering glue layer are connected through the adhesive glue layer, the framework comprises two layers of connecting shafts which are arranged in parallel, aramid fiber monofilaments are wound between two adjacent connecting shafts in the horizontal direction to form a first single ring of a spiral annular structure, aramid fiber monofilaments are wound between two adjacent connecting shafts in the vertical direction to form a second single ring of an 8-shaped structure, and the first single ring and the second single ring are alternately arranged.
The invention also provides a preparation method of the aramid fiber double-layer looped network conveyer belt, which comprises the following steps:
(1) preparing aramid monofilaments, wherein aramid stock solution is stretched and shaped through an air gap and a coagulating bath through a spinning head of a spinning metering pump, and enters a washing bath through an accelerator to be subjected to water washing, alkali washing, drying, reshaping and oil bath to prepare the aramid monofilaments;
(2) preparing a framework, wherein aramid monofilaments are subjected to hot spinning ring formation on adjacent connecting shafts in the horizontal direction at the temperature of 200-300 ℃, are subjected to hot spinning into an 8-shaped structure on adjacent connecting shafts in the vertical direction, are woven and finished into a double-layer net, are subjected to sizing and cooling, are activated by a coupling agent complex, are dried in hot air, and are naturally cooled to room temperature;
(3) preparing a rubber core, hot-refining adhesive rubber, directly calendering the aramid fiber framework without drying, and naturally cooling or air-cooling the calendered and rubberized aramid fiber double-layer ring network rubber core to room temperature;
(4) adhering upper and lower covering rubbers, finishing the edges of the aramid fiber double-layer ring network rubber core, removing burrs and coating rubber cement, extruding and sticking edge rubber strips on the edges of the two sides of the rubber core, and adhering the upper and lower covering rubbers on the surface of the aramid fiber double-layer ring network rubber core through a roller extruder to form an aramid fiber double-layer ring network conveyer belt body;
(5) and (4) conveying the belt body of the aramid fiber double-layer ring network conveyer belt into a vulcanizing machine for segmented vulcanization.
Preferably, a connecting shaft is further prepared before the step (2), the spinning pressure of the connecting shaft is 10-20 MPa, the connecting shaft is aramid fiber yarn, and oil bath treatment is not needed.
Preferably, in the step (1), the spinning pressure of the aramid filaments is 15-25 MPa.
Preferably, in the step (1), the oil bath solution is a cobalt stearate solution.
Preferably, in the step (2), the coupling agent complex is a phthalate-and-resorcinol resin complex.
Preferably, in the step (3), the cooking temperature of the adhesive is 40-50 ℃, the middle roller temperature of the four-roller calender is 60-80 ℃, the temperature of the upper roller and the lower roller is 30-40 ℃, and the calendering speed is 2.0 m/min.
Preferably, in the step (5), the vulcanization temperature is 145-165 ℃, and the unit vulcanization pressure is 25-35 MPa/m2(ii) a The base time for vulcanization was 12 minutes, with 1 minute for each 1.0 mm increase in thickness.
Preferably, in the step (5), the length of 20-30 cm reserved at two ends of the belt body of the aramid fiber double-layer ring net conveyor belt is not vulcanized.
Preferably, in the step (5), the bolt is tightened again when the temperature is raised to 100 ℃ after the bolt is tightened by the moving vulcanizer, and the pressure is set to 1.5 to 2.0 MPa.
The invention has the beneficial effects that:
1. the framework of the conveyer belt is of a double-layer structure, the horizontal direction is formed by winding aramid fiber monofilaments on adjacent connecting shafts to form a first annular ring, the vertical direction is formed by winding aramid fiber monofilaments on adjacent connecting shafts to form a second annular ring of an 8-shaped structure, the second annular ring is used for connecting an upper layer and a lower layer of spiral net frameworks formed by the first annular ring into a whole, and the second annular ring and the first annular ring are alternately distributed to form a double-layer annular net three-dimensional framework structure. The double-layer ring network three-dimensional skeleton structure has the advantages of stable structure and high breaking strength.
2. In the preparation process of the aramid fiber monofilament, oil bath is carried out in a high-temperature liquid cobalt stearate solution, and the shaped and cooled aramid fiber spiral net is activated by a coupling agent complex, so that the adhesiveness among the aramid fiber, the adhesive glue and the covering glue can be effectively improved. The aramid fiber monofilament is wound on the aramid fiber connecting shaft to form a spiral net structure, so that the flexibility of the conveying belt in operation can be improved. The single ring two is arranged between the upper layer of spiral net and the lower layer of spiral net to serve as a connecting structure, the upper layer of spiral net framework and the lower layer of spiral net framework can be connected into a whole, the stability of the structure is good, multi-layer superposition is not needed, and the phenomenon of folds which often occur in a multi-layer conveying belt is avoided. The spiral net structure has good permeability, and the forming process of the covering glue is also simple.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an aramid fiber double-layer looped network conveyor belt of the invention;
fig. 2 is a schematic structural diagram of a single ring of an embodiment of the aramid fiber double-layer looped network conveyor belt of the invention;
FIG. 3 is a schematic diagram of a single ring with two structures in an embodiment of the aramid fiber double-layer looped network conveyor belt of the present invention;
FIG. 4 is a schematic diagram of the formation of a second single ring of an embodiment of the aramid fiber double-layer looped network conveyor belt of the present invention;
FIG. 5 is a process flow diagram of an embodiment of a method for manufacturing an aramid double-layer looped network conveyor belt according to the invention;
reference numerals
1. Covering a glue layer; 2. bonding the adhesive layer; 3. a connecting shaft; 4. a single ring one; 5. a monocyclic ring II; 6. and covering a glue layer.
Detailed Description
Examples
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Fig. 1 is a schematic structural diagram of an embodiment of an aramid double-layer looped network conveyor belt of the invention, fig. 2 is a schematic structural diagram of a single ring of the embodiment of the aramid double-layer looped network conveyor belt of the invention, fig. 3 is a schematic structural diagram of a single ring of the embodiment of the aramid double-layer looped network conveyor belt of the invention, and fig. 4 is a schematic structural diagram of a single ring of the embodiment of the aramid double-layer looped network conveyor belt of the invention. As shown in fig. 1-4, the aramid fiber double-layer ring net conveying belt comprises frameworks, wherein an adhesive glue layer 2 is arranged between the frameworks in a calendaring mode, and an upper covering glue layer 1 and a lower covering glue layer 6 are connected through the adhesive glue layer 2 to form a conveying belt body. The skeleton includes parallel arrangement's two-layer connecting axle 3, and connecting axle 3 also is the aramid fiber material. The aramid monofilaments are wound between two adjacent connecting shafts 3 in the horizontal direction to form single rings 4 of a spiral annular structure, and two rows of single rings 4 adjacent in the horizontal direction are alternately distributed, so that the stress of the connecting shafts is uniform. The aramid monofilaments are wound between two adjacent connecting shafts 3 in the vertical direction to form a second 8-shaped single ring 5, and the second single ring 5 connects the upper and lower layers of spiral nets formed by the first single ring 4 into an integral structure. The first single ring 4 and the second single ring 5 are alternately arranged to form a double-layer ring network three-dimensional framework structure, and the framework structure is not only stable, but also strong in bearing capacity and high in tensile breaking strength.
Fig. 5 is a process flow diagram of an embodiment of the manufacturing method of the aramid double-layer looped network conveyor belt of the invention. As shown in fig. 1, a preparation method of an aramid double-layer looped network conveyor belt comprises the following steps:
103, preparing a framework, and thermally spinning aramid filaments into rings on a connecting shaft 3 in the horizontal direction according to the required distance between the spiral net shafts at 200-300 ℃ to form a single ring I4; thermally rotating the adjacent connecting shafts 3 in the vertical direction into an 8-shaped structure to form a second single ring 5; the first single ring 4 and the second single ring 5 are alternately distributed, woven and finished into a double-layer net, and the required thickness is achieved through shaping and cooling. And then activating by phthalate and resorcinol resin complex, drying in hot air at 80-120 ℃, naturally cooling to room temperature, coiling, packaging and warehousing.
And 107, adhering upper and lower covering glue, unfolding the aramid fiber double-layer net glue core, finishing the edge part of the aramid fiber double-layer net glue core, removing burrs, smearing glue paste, and extruding and sticking edge glue strips on the two side edge parts according to the thickness of the glue core. Then the aramid fiber double-layer net rubber core is laid on the upper covering rubber, and the rubber core and the upper covering rubber are adhered together by pulling and extruding through a roller. And (3) attaching lower covering glue to the aramid fiber double-layer mesh rubber core by the same method to form the aramid fiber double-layer ring network conveyor belt body. The aramid fiber double-layer ring network conveyer belt body with the upper and lower covering rubbers attached can be vulcanized after being parked for 8-48 hours.
And step 109, conveying the aramid fiber double-layer ring network conveying belt body into a vulcanizing machine for segmented vulcanization. The vulcanization temperature is 145-165 ℃, and the unit vulcanization pressure is 25-35 MPa/m2(ii) a The base time for vulcanization was 12 minutes, with 1 minute for each 1.0 mm increase in thickness. During vulcanization, the principle of selection of the sizing block is that the total thickness of the belt body is reduced by 8% -10%, and the width of the belt body is 2 cm smaller than the actually required width when the covering rubber is attached. When vulcanizing the first and last panelsAnd the rubber-covered aramid double-layer net needs to be extended by 20-30 cm without vulcanization so as to ensure the birth and birth of the vulcanized joint. The aramid fiber double-layer net framework has certain tension, so that only straightening treatment is carried out in the vulcanization process. When the joint is vulcanized, two ends of the aramid fiber double-layer net are cleaned by gasoline and are placed in the middle of a hot vulcanizing machine, and the condition that two strips of the aramid fiber double-layer net face upwards is ensured; two strips of aramid double-layer net are spirally and uniformly crossed and penetrate through the connecting shaft 3. The thickness of the core glue at the joint is one half of the thickness of the aramid double-layer net core plus 0.5mm, and the core glue is overlapped with the original core glue by 1-2 cm. The upper and lower cover glues at the joint are also overlapped with the original cover glue by 2-3 cm. After the bolts are tightened by the movable vulcanizing machine, the bolts are tightened again when the temperature is raised to 100 ℃, and the pressure is set to be 1.5-2.0 MPa so as to exhaust gas in the glue layer.
The preparation method is characterized by further comprising the step of preparing a connecting shaft 3 before the preparation of the aramid double-layer net, wherein the connecting shaft 3 is also made of aramid materials, the preparation process is basically the same as that of aramid monofilaments, the spinning pressure is 10-20 MPa, the diameter of the aramid monofilaments is larger than that of the aramid monofilaments, the cooling speed is high, and oil bath treatment is not needed.
According to the preparation method of the aramid fiber double-layer looped network conveyer belt, the aramid fiber monofilaments are subjected to oil bath in a high-temperature liquid cobalt stearate solution in the preparation process, and the shaped and cooled aramid fiber double-layer net is activated through the coupling agent complex, so that the adhesion among the aramid fiber, the adhesive glue and the covering glue can be effectively improved. The aramid fiber monofilament is wound on the aramid fiber connecting shaft to form a spiral net structure, so that the flexibility of the conveying belt in operation can be improved. The single ring two is arranged between the upper layer of spiral net and the lower layer of spiral net to serve as a connecting structure, the upper layer of spiral net framework and the lower layer of spiral net framework can be connected into a whole, the stability of the structure is good, multi-layer superposition is not needed, and the phenomenon of folds which often occur in a multi-layer conveying belt is avoided. The spiral net structure has good permeability, and the forming process of the covering glue is also simple. The aramid fiber double-layer ring net conveying belt produced by the preparation method of the aramid fiber double-layer ring net conveying belt has the characteristics of stable structure, high tensile strength, wear resistance, creep resistance, good water absorption and the like, the binding property between the aramid fiber double-layer net framework and the adhesive glue and the covering glue is good, the defects of bubbles, bulges and the like do not exist in the conveying belt body, and the surface of the belt body after vulcanization is smooth and has no scars. The full-thickness tensile strength of the aramid fiber double-layer looped network conveyer belt can reach 1000-6000N/mm, and the service life of the aramid fiber double-layer looped network conveyer belt is 3-5 times that of a polyester spiral net.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (7)
1. The aramid fiber double-layer ring net conveying belt is characterized by comprising a framework, wherein an adhesive layer is arranged between the frameworks in a rolling mode, an upper covering adhesive layer and a lower covering adhesive layer are connected through the adhesive layer, the framework comprises two layers of connecting shafts which are arranged in parallel, aramid fiber monofilaments are wound between every two adjacent connecting shafts in the horizontal direction to form a first single ring of a spiral annular structure, the aramid fiber monofilaments are wound between every two adjacent connecting shafts in the vertical direction to form a second single ring of an 8-shaped structure, and the first single ring and the second single ring are alternately arranged;
the preparation method of the aramid fiber double-layer looped network conveying belt comprises the following steps:
(1) preparing aramid monofilaments, wherein aramid stock solution is stretched and shaped through an air gap and a coagulating bath through a spinning head of a spinning metering pump, and enters a washing bath through an accelerator to be subjected to water washing, alkali washing, drying, reshaping and oil bath to prepare the aramid monofilaments;
(2) preparing an aramid framework, thermally spinning aramid monofilaments on adjacent connecting shafts in the horizontal direction at 200-300 ℃ to form rings, thermally spinning the aramid monofilaments on the adjacent connecting shafts in the vertical direction to form an 8-shaped structure, weaving and finishing the aramid monofilaments into a double-layer ring network, shaping and cooling the aramid monofilaments, activating the aramid monofilaments by using a coupling agent complex, drying the aramid monofilaments in hot air, and naturally cooling the aramid monofilaments to room temperature;
(3) preparing a rubber core, hot-refining adhesive rubber, directly calendering the aramid fiber framework without drying, and naturally cooling or air-cooling the calendered and rubberized aramid fiber double-layer ring network rubber core to room temperature;
(4) adhering upper and lower covering rubbers, finishing the edges of the aramid fiber double-layer ring network rubber core, removing burrs and coating rubber cement, extruding and sticking edge rubber strips on the edges of the two sides of the rubber core, and adhering the upper and lower covering rubbers on the surface of the aramid fiber double-layer ring network rubber core through a roller extruder to form an aramid fiber double-layer ring network conveyer belt body;
(5) conveying the belt body of the aramid fiber double-layer ring network conveyer belt into a vulcanizing machine for sectional vulcanization;
in the step (1), the oil bath solution is a cobalt stearate solution;
in the step (2), the coupling agent complex is a phthalate ester and resorcinol resin complex.
2. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: the preparation method further comprises the step of preparing a connecting shaft before the step (2), wherein the spinning pressure of the connecting shaft is 10-20 MPa, and the connecting shaft is aramid fiber yarn and does not need oil bath treatment.
3. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: in the step (1), the spinning pressure of the aramid monofilaments is 15-25 MPa.
4. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: in the step (3), the cooking temperature of the adhesive is 40-50 ℃, the middle roller temperature of a four-roller calender is 60-80 ℃, the temperature of an upper roller and a lower roller is 30-40 ℃, and the calendering speed is 2.0 m/min.
5. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: in the step (5), the vulcanization temperature is 145-165 ℃, and the unit vulcanization pressure is 25-35 MPa/m2(ii) a The base time for vulcanization was 12 minutes, with 1 minute for each 1.0 mm increase in thickness.
6. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: and (5) reserving the length of 20-30 cm at two ends of the belt body of the aramid fiber double-layer ring network conveyer belt without vulcanizing.
7. The aramid fiber double-layer looped network conveyor belt as claimed in claim 1, characterized in that: in the step (5), after the bolt is tightened by the movable vulcanizing machine, the bolt is tightened again when the temperature is raised to 100 ℃, and the pressure is set to be 1.5-2.0 MPa.
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| CN201711386491.8A CN109795840B (en) | 2017-12-20 | 2017-12-20 | Aramid fiber double-layer ring network conveyer belt and preparation method thereof |
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| CN109795840B true CN109795840B (en) | 2020-12-01 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2608696B2 (en) * | 1995-05-09 | 1997-05-07 | 株式会社フジテツモーテクニカルサービス | Belt for net conveyor |
| CN101724935B (en) * | 2009-12-14 | 2011-09-14 | 中蓝晨光化工研究院有限公司 | Polyphenylene terephthalamide fibre and preparation method thereof |
| CN201801130U (en) * | 2010-02-09 | 2011-04-20 | 浙江国力纺织有限公司 | Core cloth for conveyer belt |
| CN202529497U (en) * | 2012-04-25 | 2012-11-14 | 焦作李封聚酯胶带有限公司 | Lx ring conveyer belt |
| CN102815496B (en) * | 2012-08-31 | 2015-05-06 | 南京东润带业有限公司 | Easy-joint PVC (polyvinyl chloride)-core polyvinyl chloride conveying belt and preparation method thereof |
| CN203345571U (en) * | 2013-06-22 | 2013-12-18 | 济宁圣泰机电制造有限公司 | Multi-layer structure belt core |
| CN103469343B (en) * | 2013-09-13 | 2015-10-21 | 东华大学 | A kind of method improving the Interaction Force of fento in aramid fiber |
| CN104129595B (en) * | 2014-08-06 | 2017-01-04 | 兖矿集团有限公司 | A kind of straight through whole core aramid fiber fire retarding conveying band |
| CN104611819A (en) * | 2015-02-13 | 2015-05-13 | 浙江尤夫科技工业有限公司 | Aramid rubber canvas fabric structure for high-strength conveyor belts and production process of aramid rubber canvas fabric structure |
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Denomination of invention: Aramid double layer ring net conveyor belt and its preparation method Effective date of registration: 20221116 Granted publication date: 20201201 Pledgee: China Construction Bank Co.,Ltd. Boye Sub branch Pledgor: BAODING HUAYUE RUBBER BELTS Co.,Ltd. Registration number: Y2022130000113 |
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