CN110963237A - Small-size flame-retardant conveying belt - Google Patents
Small-size flame-retardant conveying belt Download PDFInfo
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- CN110963237A CN110963237A CN201911324138.6A CN201911324138A CN110963237A CN 110963237 A CN110963237 A CN 110963237A CN 201911324138 A CN201911324138 A CN 201911324138A CN 110963237 A CN110963237 A CN 110963237A
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- flame
- retardant
- conveyor belt
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- aramid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/30—Belts or like endless load-carriers
- B65G15/32—Belts or like endless load-carriers made of rubber or plastics
- B65G15/38—Belts or like endless load-carriers made of rubber or plastics with flame-resistant layers, e.g. of asbestos, glass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Woven Fabrics (AREA)
Abstract
A small-size flame-retardant conveyor belt, the bandwidth of the conveyor belt is 25-36cm, the conveyor belt comprises an aramid fabric framework and a flame-retardant coating layer, wherein: the aramid fabric framework is a composite leno weave fabric, the form of a twisted group is one twisted two, the density of warp and weft is N x N, N is more than or equal to 6 and less than or equal to 12, and the leno weave fibers are coated with a flame retardant; and the coating layer is extruded to the outside of the aramid fiber fabric framework for molding. Compared with the prior art, the flame-retardant conveyor belt has the advantages that the flame-retardant performance of the product is effectively improved and the service life of the product is effectively prolonged due to the double flame-retardant structure, the phenomenon of layering of the conveyor belt due to long service life is avoided by adopting an extrusion process, the conventional process of coating and compounding for multiple times is avoided, the flame retardant is coated, the flame-retardant components are effectively protected, the flame-retardant performance failure of the conveyor belt due to long-term abrasion is avoided to the greatest extent, the manufacturing process is simple, the one-step forming is realized, and the popularization value is good.
Description
Technical Field
The invention relates to the technical field of industrial conveying belts, in particular to a small-size flame-retardant conveying belt.
Background
With the continuous improvement of the living standard of people, the industries such as logistics, airports and the like are developed vigorously, and the demands on mechanization and automation are higher and higher. The conveyer belt, especially the light conveyer belt, mostly adopts polyester, nylon and the like as the conveyer belt skeleton, and the polyester fiber has good weather resistance, is resistant to sunlight and acid rain, is not afraid of mildew and worm damage, is an ideal conveyer belt skeleton material, but the surface of the conveyer belt is easy to adsorb dust, has poor melting resistance, and cannot be operated in a high-temperature environment for a long time. The nylon is called nylon, has high strength and wear resistance, and also has good performances of corrosion resistance, pollution resistance, worm damage resistance and the like, but is easy to deform and wrinkle under the action of external force.
Besides the framework, the surface covering layer of the light conveyor belt is mainly made of high polymer materials, and the materials are flammable materials. In recent years, fire prevention safety goes deep into the mind, and in order to greatly reduce potential safety hazards, the fire-retardant requirement is put forward for the conveying belt which plays a main transportation role.
At present, most of conveyor belts are made of a single material, and a small amount of flame retardant is added into a coating layer on the surface of the conveyor belt, so that the flame retardant effect is achieved. However, in the long-term use process, the coating layer on the surface of the conveying belt is easily abraded, so that the flame retardant property of the conveying belt is greatly reduced, and the service life of the conveying belt is shortened. The covering layer thickness of the aramid fiber fabric whole-core flame-retardant conveyor belt in the prior art CN107216560B is only 3-5cm, the service life is usually not more than 3 months, and the problem that the conveyor belt with long service life and low cost is obtained at present is urgently needed to be solved.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a small-size flame-retardant polyurethane conveyor belt and a preparation process thereof, which can avoid the failure of flame-retardant performance caused by long-term wear of the conveyor belt to the greatest extent.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a fire-retardant conveyer belt of small-size, the conveyer belt includes aramid fiber fabric skeleton and fire-retardant coating, wherein: the aramid fabric framework is a composite leno weave fabric, the form of a twisted group is one twisted two, the density of warp and weft is N x N (N is more than 6), and the leno weave fibers are coated with a flame retardant; and the coating layer is extruded to the outside of the aramid fiber fabric framework for molding. The conveying belt framework is coated with the flame retardant, the coating layer also has flame retardant performance, and the failure of the flame retardant performance of the conveying belt caused by long-term abrasion can be avoided to the greatest extent.
The further improvement of the technical scheme is as follows: the warp direction of the aramid fiber fabric framework is a plied yarn formed by processing aramid fiber filaments; the weft direction of the framework is a twisted yarn formed by processing aramid staple fibers and aramid filaments.
In the above scheme, preferably, the warp direction is aramid filaments coated with a flame retardant, yarn I is obtained through the first 2-ply twisting, and yarn I is obtained through the second 4-ply twisting to obtain 16-ply warp yarns.
More preferably, the twist of the warp direction plied yarns is 90-130 turns/m, and the twist direction is S twist.
In the above scheme, preferably, the weft direction is formed by plying yarns a of aramid staple fibers and yarns B of aramid filaments.
More preferably, the yarn a is aramid staple fiber coated with a flame retardant, and is subjected to first 4-ply stranding to obtain a yarn II, and the yarn II is subjected to second 4-ply stranding to obtain a 16-ply yarn a.
More preferably, the yarn B is aramid filaments coated with a flame retardant, and is obtained by 2 plying processes at a time.
More preferably, the ply twist of the yarn A is 100-130 r/m, and the twist direction is S twist. The ply twist of the yarn B is 90-130 turns/m, and the twist direction is S twist. The twisted degree of the yarn A and the yarn B is 90-130 r/m, and the twisting direction is S twisting.
In the above scheme, preferably, the aramid filaments are 1500D; in addition, the aramid staple fiber is 10 s.
In the scheme, preferably, the warp and weft density N of the aramid fabric framework is 6-12, and the best warp and weft density is 9 x 9.
In a preferred embodiment, the framework is composed of warp and weft yarns, the twist set being in the form of one twist and two, wherein:
warp direction: the 1500D aramid filament that the cladding has the fire retardant obtains first yarn through 2 plying for the first time, and first yarn I obtains 16 warps of plying through 4 plying for the second time again, and its twice-plied twist is: 100 turns/m, the twisting direction is: s twisting;
weft direction: the 10s aramid staple fiber of cladding fire retardant obtains the second yarn through 4 plying of first time, and the second yarn obtains 16 plying warp A through 4 plying of second time again, and its twice plying twist is: 120 turns/m, the twisting direction is as follows: s twisting; 1500D aramid filament yarn of cladding fire retardant obtains yarn B through once 2 plys, and its twist is: 100 revolutions per meter; and then the yarn A and the yarn B are plied to obtain weft yarns, and the twist number of the weft yarns is as follows: 100 turns/m, the twisting direction is: and S twisting.
The flame retardant can be any commercially available flame retardant product with a single or composite form and a flame retardant effect, and any component which can be coated on the surface of the aramid fiber to form a flame retardant layer can be used as the flame retardant in the invention, and is not limited or exemplified to describe herein.
Preferably, the flame retardant coating layer is a polyether type TPU layer. The TPU layer mainly plays a shaping role in the flame-retardant conveyor belt, but the TPU layer has flame-retardant performance, so the coating layer also has a double flame-retardant effect.
The framework of the small-size flame-retardant conveying belt is woven by a double-beam shuttle loom, and the width of the framework is 25-36 cm.
The flame retardant coating layer of this embodiment is obtained by hot-pressing polyether type TPU particles and then extruding the particles onto a skeleton, wherein the extruder rotation speed is as follows: 100-: 180 ℃ and 200 ℃, the temperature of the extrusion die head is as follows: 195 ℃ and 210 ℃. The coating covers on the framework to form a conveying belt, and the thickness of the whole belt is 3 cm.
The manufacturing method of the small-size flame-retardant conveying belt comprises the following steps:
1) weaving an aramid framework: weaving the warp yarns and the weft yarns which are subjected to the plying weaving into a framework structure by a double-beam shuttle loom, wherein the density of the warp yarns and the weft yarns is N x N, N is more than or equal to 6 and less than or equal to 12, and the form of a twisted group is one twisted and two;
2) extruding the flame-retardant coating layer: adding polyether type TPU particles into an extruder, extruding the mixture onto a framework after hot pressing, wherein the rotating speed of the extruder is as follows: 100-: 180 ℃ and 200 ℃, the temperature of the extrusion die head is as follows: 195 ℃ and 210 ℃. The coating covers on the framework to form a conveying belt, and the thickness of the whole belt is 3 cm.
Preferably, the warp that the plying was woven is the 1500D aramid filament that the cladding has the fire retardant, obtains first yarn through 2 plying of first time, and first yarn I obtains 16 plying warp through 4 plying of second time again, and its twice plying twist is: 100 turns/m, the twisting direction is: and S twisting.
Preferably, the weft yarns woven in a plying mode are 10s aramid short fibers coated with flame retardants, a second yarn is obtained through first 4 plying, the second yarn is obtained through second 4 plying, 16 plied warp yarns A are obtained, and the twist of the two plying modes is as follows: 120 turns/m, the twisting direction is as follows: s twisting; 1500D aramid filament yarn of cladding fire retardant obtains yarn B through once 2 plys, and its twist is: 100 revolutions per meter; and then the yarn A and the yarn B are plied to obtain weft yarns, and the twist number of the weft yarns is as follows: 100 turns/m, the twisting direction is: and S twisting.
Compared with the prior art, the conveying belt provided by the invention has the following advantages:
(1) according to the flame-retardant conveying belt, the double flame-retardant structure effectively improves the flame-retardant performance and the service life of a product, the conventional process of coating and compounding for multiple times is avoided, the manufacturing process is simple, and the product is formed in one step;
(2) according to the small-size flame-retardant polyurethane conveyor belt and the preparation process thereof, an extrusion process is adopted, the conveyor belt is free of layering phenomenon caused by long service life, the process is simple, the manufacturing cost is low, and the service life of the conveyor belt is prolonged;
(3) according to the small-size flame-retardant polyurethane conveyor belt and the preparation process thereof, the flame retardant is coated, so that the flame-retardant components are effectively protected, and the failure of the flame-retardant performance of the conveyor belt due to long-term abrasion is avoided to the greatest extent.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example 1
The small-size flame-retardant polyurethane conveyor belt comprises an aramid fabric framework and a flame-retardant coating layer, wherein the aramid fabric framework is a composite tissue fabric, the twisting form is one to two, the warp-weft density is 9 x 9, and the gauze tissue fibers are coated with a flame retardant; and the coating layer is extruded to the outside of the aramid fiber fabric framework for molding.
In this embodiment, the warp-wise aramid filament that has the fire retardant of cladding of skeleton obtains yarn I through 2 plying of first time, and yarn I obtains 16 warps of plying through 4 plying of second time again, and its twice-plied twist is: 100 turns/m, the twisting direction is: s twisting; the latitudinal direction of skeleton is twisted together by aramid fiber staple fiber's yarn A and aramid fiber filament's yarn B and forms, and yarn A is the aramid fiber staple fiber that the cladding has the fire retardant, obtains yarn II through 4 plying of first time, and yarn II obtains 16 plying yarn A through 4 plying of second time again, and its twice plying twist is: 120 turns/m, the twisting direction is as follows: s twisting; yarn B is the aramid fiber filament that cladding has the fire retardant, obtains yarn B through once 2 plys, and its twist is: 100 turns/m, the twisting direction is: s twisting; and the yarn A and the yarn B are folded to obtain a weft yarn, and the twist number of the weft yarn is as follows: 100 turns/m, the twisting direction is: and S twisting. The aramid filament yarn is 1500D, and the aramid staple fiber is 10 s.
The flame retardant can adopt any single or composite flame retardant product with flame retardant effect which is sold in the market at present, and the flame retardant can be used as the flame retardant in the invention as long as the flame retardant can be coated on the surface of the aramid fiber to form a flame retardant layer. In this embodiment, the flame retardant may be one or more of aluminum hydroxide, magnesium hydroxide, monoammonium phosphate, and diammonium phosphate.
In the embodiment, the framework is woven by a double-beam shuttle loom, and the width of the framework is 25-36 cm.
The flame retardant coating layer of this embodiment is obtained by hot-pressing polyether type TPU particles and then extruding the particles onto a skeleton, wherein the extruder rotation speed is as follows: 100-: 180 ℃ and 200 ℃, the temperature of the extrusion die head is as follows: 195 ℃ and 210 ℃. The coating covers on the framework to form a conveying belt, and the thickness of the whole belt is 3 cm.
In conclusion, the manufacturing method of the small-size flame-retardant conveyor belt in the embodiment comprises two steps of framework weaving and cladding hot-pressing, wherein the framework weaving is completed by a double-beam shuttle loom, the width of the woven belt is small-size 25-36cm, and warp yarns and weft yarns of the framework are formed by stranding the steps; the hot pressing of the coating is accomplished by an extruder, the extruder parameters being as described above.
The TPU coating layer formed by hot extrusion is completely coated outside the framework, the TPU has flame retardance, and warp yarns and weft yarns of the framework are all coated with flame retardants, so that the flame-retardant conveying belt of the embodiment has double flame retardance, still has good flame retardance after being worn and worn for a period of time compared with the conventional flame-retardant conveying belt, and can be continuously used.
Comparative example 1
The difference between the comparative example and the example 1 is that the warp and weft density of the conveyer belt skeleton in the comparative example 1 is 6 x 6, and the rest of the preparation process and the weaving method of the warp and weft are the same as the example 1.
Comparative example 2
The difference between this comparative example and example 1 is that the warp and weft density of the belt skeleton in this comparative example 2 is 12 x 12, and the rest of the manufacturing process and the weaving method of warp and weft yarns are the same as example 1.
Performance detection
The flame retardant performance of the conveyor belts of 1 example and 2 comparative examples after trial production was tested by combining the above preparation methods, wherein the flame retardant test standard was tested according to ISO 340, and the results are shown in table 1.
TABLE 1 flame retardancy test
As can be seen from Table 1, the flame retardant property of comparative example 1 does not meet the requirement of ISO 340 and cannot be used as a flame retardant conveyor belt, and the flame retardant properties of example 1 and comparative example 2 meet the requirement of ISO 340, but the skeleton density of comparative example 2 is large, the production cost is high, the process is complex, and the flame retardant conveyor belt is not generally used in normal production.
At present, a conventional conveying belt sold in the market has no flame retardant performance, and the conventional flame retardant conveying belt is formed by coating a cladding layer on a framework material and spraying a layer of flame retardant on the cladding layer to form a single-side coated double-layer flame retardant conveying belt, which is completely different from the framework-coated double-flame retardant conveying belt in structure. The flame retardant conveyor belt of example 1 was compared with a conventional conveyor belt and a conventional flame retardant conveyor belt which are commercially available and have no flame retardant effect, and the results are shown in table 2.
TABLE 2 conveyer belt comparison
| Conventional conveyor belt | Existing flame-retardant conveying belt | Example 1 | |
| Duration of continuous combustion/s | 53 | 0 | 0 |
| Whether the sample is reignited/s | Is that | Whether or not | Whether or not |
| Reignition duration/s | 48 | 0 | 0 |
After 3 months of normal use, the surface of the conveyer belt is abraded to a certain extent, and the flame retardant property of the conveyer belt is detected again, and the result is shown in table 3.
TABLE 3 conveyor belt Performance test after wear
| Existing flame-retardant conveying belt | Example 1 | |
| Duration of continuous combustion/s | 48 | 0 |
| Whether the sample is reignited/s | Is that | Whether or not |
| Reignition duration/s | 30 | 0 |
The detection indexes in tables 2 and 3 are all detected according to the requirements of ISO 340. As can be seen from tables 2 and 3, the flame retardant conveyor belt of example 1 of the present invention has a good flame retardant effect both in a brand new state and after being used for 3 months in a conventional manner. The product structure of the invention ensures that only the coating layer on the surface of the conveyor belt is worn, and the flame retardant on the framework structure is not worn, so that when the normal replacement period (3 months) comes, the flame-retardant conveyor belt can still keep good flame-retardant effect, and can be continuously used according with the flame-retardant requirement of ISO 340.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A small-size flame-retardant conveyor belt, the bandwidth of the conveyor belt is 25-36cm, characterized in that the conveyor belt comprises an aramid fabric framework and a flame-retardant coating layer, wherein: the aramid fabric framework is a composite leno weave fabric, the form of a twisted group is one twisted two, the density of warp and weft is N x N, N is more than or equal to 6 and less than or equal to 12, and the leno weave fibers are coated with a flame retardant; and the coating layer is extruded to the outside of the aramid fiber fabric framework for molding.
2. The small-size flame-retardant conveyor belt according to claim 1, wherein the aramid fabric skeleton has a warp direction of a plied yarn formed by processing aramid filaments; the weft direction is a twisted yarn formed by processing aramid short fibers and aramid filaments.
3. The small-size flame-retardant conveying belt according to claim 2, wherein the warp direction is aramid filaments coated with a flame retardant, a yarn I is obtained through a first 2-ply stranding, and a 16-ply warp yarn is obtained through a second 4-ply stranding.
4. The small-sized flame-retardant conveyor belt according to claim 2, wherein the weft direction is formed by plying yarns A of aramid staple fibers and yarns B of aramid filaments.
5. The small-size flame-retardant conveyor belt according to claim 4, wherein the yarn A is aramid staple fiber coated with a flame retardant, a first 4-ply yarn is obtained to obtain a yarn II, and a second 4-ply yarn is obtained to obtain a 16-ply yarn A.
6. The small-size flame-retardant conveyor belt according to claim 4, wherein the yarn B is aramid filaments coated with a flame retardant, and is obtained by 2-ply stranding at a time.
7. The small-sized flame-retardant conveyor belt according to any one of claims 2 to 6, wherein the twist of the yarn ply is 90 to 130 turns/m, and the twist direction is S twist.
8. The small-size flame-retardant conveyor belt according to claim 1, wherein the flame-retardant coating layer is a polyether-type TPU layer.
9. The small-size flame-retardant conveyor belt according to claim 1, wherein the aramid fabric frame is woven by a double-beam shuttle loom.
10. The small-sized flame-retardant conveyor belt according to claim 8, wherein the extrusion process of the coating layer is as follows: the rotation speed of the extruder is 100-.
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| CN201911324138.6A CN110963237A (en) | 2019-12-20 | 2019-12-20 | Small-size flame-retardant conveying belt |
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| CN201911324138.6A CN110963237A (en) | 2019-12-20 | 2019-12-20 | Small-size flame-retardant conveying belt |
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| CN116836419A (en) * | 2023-08-10 | 2023-10-03 | 枣庄天宏新材料科技有限公司 | High-strength flame-retardant conveying belt and preparation method and application thereof |
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| CN116836419A (en) * | 2023-08-10 | 2023-10-03 | 枣庄天宏新材料科技有限公司 | High-strength flame-retardant conveying belt and preparation method and application thereof |
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