Sizing and drying device for carbon fiber production

Abstract

The embodiment of the present application provides a sizing and drying device for carbon fiber production, and relates to the technical field of carbon fiber production.The sizing and drying device for carbon fiber production comprises a sizing tank and a suction hood, the sizing tank and the suction hood are provided with a drying space, and the top of the suction hood is provided in an inclined manner; a plurality of godets are arranged in the drying space, and at least part of the godets are located in the sizing tank; a sizing and drying roller is arranged in the drying space and located above the plurality of godets, the sizing and drying roller is used for drying the tows wound thereon; a liquid guide plate is arranged in the drying space, the upper end of the liquid guide plate is connected with the lowest end of the inclined suction hood, and the lower end of the liquid guide plate extends to below the sizing and drying roller in an inclined manner; and a liquid collecting tank is arranged at the lower end of the liquid guide plate, and the liquid collecting tank extends to outside the range of the sizing tank at both ends.The present application has the effect of improving the sizing and drying effect of the tows and further improving the product quality.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber production technology, and more specifically, to a sizing and drying apparatus for carbon fiber production. Background Technology

[0002] In the industrial production of carbon fiber, the drying process after sizing is a key step to ensure the performance of the fiber bundle and the quality of the product. The main purpose of this process is to remove the residual moisture or solvent on the fiber surface after sizing, so that the sizing agent can form a uniform, continuous and dry protective film on the fiber surface to protect the fiber and enhance its bonding with the matrix resin.

[0003] However, during the current yarn drying process, the water vapor and sizing agent condensate generated during drying drip directly onto the yarn, affecting the sizing and drying effect of the yarn and thus impacting product quality. Summary of the Invention

[0004] The present invention aims to provide a sizing and drying apparatus for carbon fiber production, which can improve the sizing and drying effect of fiber bundles, thereby improving product quality.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a sizing and drying apparatus for carbon fiber production, comprising: The sizing tank and the suction hood are arranged sequentially from top to bottom, with a drying space between the sizing tank and the suction hood, and the top of the suction hood is inclined. A plurality of guide rollers are disposed in the drying space, and at least some of the guide rollers are located in the sizing tank, so that when the yarn bundle is wound onto the guide rollers, it is partially immersed in the sizing tank; A sizing and drying roller is disposed within the drying space and located above a plurality of the guide rollers. The sizing and drying roller is used to dry the filament bundle wound thereon. A liquid guide plate is disposed in the drying space. The upper end of the liquid guide plate is connected to the lowest inclined end of the suction hood, and the lower end of the liquid guide plate extends inclinedly to below the sizing drying roller. A liquid collection tank is located at the lower end of the liquid guide plate, and both ends of the liquid collection tank extend beyond the range of the slurry tank.

[0006] In an optional embodiment, the surface of the liquid guide plate is coated with a polytetrafluoroethylene anti-stick layer.

[0007] In an optional embodiment, the tilt angle of the liquid guide plate is 5°-8°.

[0008] In an optional embodiment, one end of the collection tank is connected to a waste liquid tank via a waste liquid pipe, and a drain valve is provided on the waste liquid pipe.

[0009] In an optional embodiment, the plurality of guide rollers include at least two sizing rollers, the sizing rollers being at least partially located within the sizing groove, and the filament bundle being held and wound around the lower end of the sizing roller.

[0010] In an optional embodiment, the drying device further includes a negative pressure control system, which includes a collection pipe and a variable frequency vacuum pump. One end of the collection pipe is connected to the top of the suction hood, and the other end of the collection pipe is connected to the variable frequency vacuum pump.

[0011] In an optional embodiment, the negative pressure control system further includes a controller, a negative pressure sensor, and a droplet sensor. The negative pressure sensor is used to detect the pressure inside the collection pipe and transmit the pressure value signal to the controller. The controller is used to control the frequency of the variable frequency vacuum pump based on the pressure value signal. The droplet sensor is used to detect the droplet concentration inside the suction hood and transmit the concentration value signal to the controller. The controller is used to control the frequency of the variable frequency vacuum pump based on the concentration value signal to adjust the negative pressure value of the collection pipe.

[0012] In an optional embodiment, the negative pressure control system further includes a filter and a condensate collection tank, the condensate collection tank being connected to the output end of the variable frequency vacuum pump via the filter.

[0013] In an optional embodiment, the drying device further includes an anti-splash system, which includes an upper baffle and a lower baffle. The upper baffle is disposed in the circumferential direction of the sizing tank, and the lower baffle is disposed in the circumferential direction of the suction hood. An inlet and an outlet for feeding the yarn bundle into and out of the drying space are formed between the upper baffle and the lower baffle.

[0014] In an optional embodiment, the anti-splash system further includes a compressed air curtain disposed at the yarn inlet and the yarn outlet.

[0015] The beneficial effects of the sizing and drying apparatus for carbon fiber production provided in this embodiment of the invention include: A guide plate is installed in the drying space, and the upper end of the guide plate is connected to the lowest inclined end of the suction hood. This allows the condensate flowing along the top of the suction hood to drip onto the guide plate and flow along the guide plate to collect in the liquid collection tank. This prevents water vapor generated during the drying process and condensate on the suction hood from dripping directly onto the yarn bundle and the liquid collection tank, thus preventing contamination of the slurry in the liquid collection tank, improving the sizing and drying effect of the yarn bundle, and ultimately improving product quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of the carbon fiber production sizing and drying device provided in this embodiment. Figure 2 This is a schematic diagram of the external structure of the sizing and drying device for carbon fiber production provided in this embodiment.

[0018] Icons: 100-Sizing tank; 200-Suction hood; 300-Guide roller; 310-Sizing roller; 400-Sizing drying roller; 500-Guide plate; 510-Collection tank; 610-Collection pipe; 620-Variable frequency vacuum pump; 630-Negative pressure sensor; 640-Droplet sensor; 650-Filter; 660-Condensate collection box; 710-Upper baffle; 720-Lower baffle; 730-Compressed air curtain. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] In the industrial production of carbon fiber, the drying process after sizing is a crucial step in ensuring the performance of the fiber bundle and the quality of the product. However, existing carbon fiber sizing and drying equipment has the following drawbacks: First, the negative pressure exhaust force of current carbon fiber sizing and drying equipment is not adjustable, which easily causes sizing droplets to spread with the airflow, contaminating the internal pipes and components of the equipment and increasing the load on subsequent exhaust gas treatment, leading to higher processing costs. Second, the water vapor and sizing agent condensate generated by the current drying equipment are unobstructed and unguided, dripping directly onto the fiber bundles below, causing adhesive-laden fibers and severely impacting the product defect rate, which can reach 5%-8%. Third, during the current carbon fiber production process, the sizing liquid is prone to splashing without protection, resulting in sizing residue exceeding 60% around the equipment and on the ground. This requires a large amount of cleaning work, with each cleaning session taking 2-3 hours. Furthermore, contact with the sizing liquid can cause discomfort, affecting the safety and comfort of operators. These problems seriously affect the production efficiency and product quality of current carbon fiber sizing and drying equipment.

[0026] Based on this, the present invention provides a sizing and drying device for carbon fiber production to improve the above-mentioned problems and enhance carbon fiber production efficiency and product quality. The overall structure, working principle, and technical effects of the sizing and drying device for carbon fiber production provided by the present invention are described in detail below through embodiments and in conjunction with the accompanying drawings.

[0027] Please refer to Figure 1 and Figure 2 The carbon fiber sizing and drying device provided by the present invention is applied in the field of carbon fiber production technology, specifically in the carbon fiber sizing and drying process.

[0028] The carbon fiber production sizing and drying device provided by this invention includes a sizing tank 100, a suction hood 200, guide rollers 300, a sizing and drying roller 400, a liquid guide plate 500, and a liquid collection tank 510. The sizing tank 100 and the suction hood 200 are arranged sequentially from top to bottom, with a drying space between them for drying the fiber bundle. The sizing tank 100 contains sizing liquid for sizing the fiber bundle, and the suction hood 200 is used to extract droplets generated during the drying of the fiber bundle in the drying space. Several guide rollers 300 are arranged in the drying space, and at least some of the guide rollers 300 are located within the sizing tank 100. As the fiber bundle sequentially passes around several guide rollers 300, a portion of the fiber bundle is pressed into the sizing tank 100 by the guide rollers 300, and the fiber bundle immersed in the sizing tank 100 undergoes sizing treatment. A sizing and drying roller 400 is positioned within the drying space, above the guide roller 300. The sizing bundles, after being sized in the sizing tank 100, undergo drying via the sizing and drying roller 400. A liquid guide plate 500 is also positioned within the drying space, with the top of the suction hood 200 angled. The upper end of the liquid guide plate 500 connects to the lowest angled end of the suction hood 200, and the lower end of the liquid guide plate 500 extends angledly below the sizing and drying roller 400. A liquid collection tank 510 is positioned below the liquid guide plate 500 to collect and hold the condensate flowing down the liquid guide plate 500. Both ends of the liquid collection tank 510 extend beyond the sizing tank 100 to prevent the condensate in the collection tank 510 from flowing back into the sizing tank 100.

[0029] By setting a guide plate in the drying space, and connecting the upper end of the guide plate to the lowest inclined end of the suction hood 200, the condensate flowing along the inclined top of the suction hood 200 drips onto the guide plate and flows along the guide plate to collect in the liquid collection tank 510. This avoids water vapor generated during the drying process and condensate on the suction hood 200 dripping directly into the yarn bundle and the liquid collection tank 510, preventing the slurry in the liquid collection tank 510 from being contaminated, improving the sizing and drying effect of the yarn bundle, and thus improving product quality.

[0030] Please refer to Figure 1 and Figure 2 In some optional embodiments, the liquid guide plate 500 is made of 304 stainless steel and coated with a PTFE anti-stick layer of 80μm-120μm thickness. The low coefficient of friction and hydrophobicity of PTFE allow the condensate to flow rapidly along the liquid guide plate 500, improving the collection effect. Furthermore, the liquid guide plate 500 is inclined at an angle of 5°-8°, allowing the condensate to flow along the inclined guide plate into the collection tank 510. To facilitate the discharge of waste liquid from the collection tank 510, in other optional embodiments, one end of the collection tank 510 is connected to a waste liquid tank via a waste liquid pipe, enabling the discharge, collection, and storage of waste liquid in the collection tank 510. A drain valve is installed on the waste liquid pipe.

[0031] Please refer to Figure 1 In some alternative embodiments, the plurality of guide rollers 300 include at least two sizing rollers 310, which are at least partially immersed in the sizing tank 100, and the two sizing rollers 310 are located on the same horizontal plane, with the filament bundle supported and wound around the lower end of the sizing roller 310. Thus, the filament bundle located between the two sizing rollers 310 is always immersed in the sizing liquid in the sizing tank 100, so as to facilitate the sizing treatment of the filament bundle.

[0032] Please refer to Figure 1 In some optional embodiments, the drying device further includes a negative pressure control system, which includes a collection pipe 610 and a variable frequency vacuum pump 620. One end of the collection pipe 610 is connected to the top of the suction hood 200, and the other end is connected to the variable frequency vacuum pump 620. The variable frequency vacuum pump 620 maintains a negative pressure in the collection pipe 610, thereby drawing water vapor from the suction hood 200. Utilizing the principle of rising steam, the collection pipe 610 is connected to the top of the suction hood 200 to ensure effective steam extraction.

[0033] Please refer to Figure 1 In some optional embodiments, the negative pressure control system further includes a controller, a negative pressure sensor 630, and a droplet sensor 640. In this embodiment, the variable frequency vacuum pump 620 is a dual variable frequency vacuum pump 620, which enables adjustable suction frequency and suction intensity. The negative pressure sensor 630 is installed on the collection pipe 610 to detect the pressure within the collection pipe 610 and transmits the pressure value signal to the controller. The controller controls the frequency of the variable frequency vacuum pump 620 based on the pressure value signal, ensuring that the frequency of the variable frequency vacuum pump 620 is within the range of 20Hz-50Hz. The droplet sensor 640 is installed inside the suction hood 200 to detect the droplet concentration within the suction hood 200 and transmits the concentration value signal to the controller. The controller controls the frequency of the variable frequency vacuum pump 620 based on the concentration value signal to adjust the negative pressure value of the collection pipe 610, ensuring that the droplet concentration in the drying space is within the design requirements range to provide a good drying effect.

[0034] Please refer to Figure 1 Furthermore, the negative pressure control system also includes a filter 650 and a condensate collection tank 660. The condensate collection tank 660 is connected to the output of the variable frequency vacuum pump 620 through the filter 650. The mist is filtered and then transported to the condensate collection tank 660 for storage. By setting up a negative pressure control system, internal pollution of the equipment can be significantly reduced, and the load on subsequent exhaust gas treatment can be reduced, thus lowering treatment costs.

[0035] Please refer to Figure 1 and Figure 2 In some optional embodiments, the drying apparatus further includes an anti-splash system, which includes an upper baffle 710 and a lower baffle 720. The upper baffle 710 is disposed circumferentially in the sizing tank 100, and the lower baffle 720 is disposed circumferentially in the suction hood 200. Both the upper baffle 710 and the lower baffle 720 are made of transparent PC board to facilitate the inspection of the yarn drying status, while reducing costs and the overall weight of the equipment. An inlet and an outlet for the yarn to enter and exit the drying space are formed between the upper baffle 710 and the lower baffle 720.

[0036] Furthermore, in this embodiment, the upper baffle 710 and the suction hood 200 are sealed with a silicone sealing strip, and the lower baffle 720 and the sizing tank 100 are sealed with a silicone sealing strip. The anti-splash system also includes a compressed air curtain 730, which is located at the yarn inlet and outlet. The compressed air curtain 730 ejects high-speed compressed air through air holes, thereby forming a continuous air barrier at the yarn inlet and outlet. Through the combined action of the compressed air curtain 730 and the silicone sealing strip, the drying space is separated from the external environment, preventing external air, dust, and insects from intruding and contaminating the raw materials, while also preventing internal gas and heat leakage, thus saving energy.

[0037] In some alternative embodiments, the upper baffle 710 and the lower baffle 720 can also be height-adjustable to facilitate adjustment of the size of the inlet and outlet of the yarn, thereby improving applicability. Furthermore, it facilitates opening the drying space for equipment inspection, maintenance, and repair operations, further enhancing applicability.

[0038] In summary, the implementation principle of the carbon fiber sizing and drying device provided by the present invention is as follows: by setting a guide plate in the drying space, and connecting the upper end of the guide plate to the lowest inclined end of the suction hood 200, the condensate flowing along the inclined top of the suction hood 200 drips onto the guide plate and flows along the guide plate to collect in the liquid collection tank 510. This avoids water vapor generated during the drying process and condensate on the suction hood 200 from dripping directly into the fiber bundle and the liquid collection tank 510, thus preventing the sizing in the liquid collection tank 510 from being contaminated, improving the sizing and drying effect of the fiber bundle, and thereby improving product quality.

[0039] Through actual production trials and comparisons, the carbon fiber sizing and drying device provided by this invention significantly improves the carbon fiber sizing and drying qualification rate, increasing it from 92% to 99.5%, and virtually eliminating quality issues such as adhesive residue. Equipment cleaning costs are reduced by 70%, exhaust gas treatment costs by 40%, and slurry recovery saves 15% on raw material costs. The slurry residue rate in the working environment is ≤5%, significantly improving operator safety and comfort, and meeting green production requirements.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A sizing and drying apparatus for carbon fiber production, characterized in that, include: A sizing tank and a suction hood are arranged sequentially from top to bottom, with a drying space between the sizing tank and the suction hood, and the top of the suction hood is inclined. A plurality of guide rollers are disposed in the drying space, and at least a portion of the guide rollers are located in the sizing trough, so that when the yarn bundle is wound onto the guide rollers, it is partially immersed in the sizing trough; A sizing and drying roller is disposed within the drying space and located above a plurality of the guide rollers. The sizing and drying roller is used to dry the filament bundle wound thereon. A liquid guide plate is disposed in the drying space. The upper end of the liquid guide plate is connected to the lowest inclined end of the suction hood, and the lower end of the liquid guide plate extends inclinedly to below the sizing drying roller. A liquid collection tank is located at the lower end of the liquid guide plate, and both ends of the liquid collection tank extend beyond the range of the slurry tank.

2. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, The surface of the liquid guide plate is coated with a polytetrafluoroethylene anti-stick layer.

3. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, The tilt angle of the liquid guide plate is 5°-8°.

4. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, One end of the collection tank is connected to a waste liquid tank via a waste liquid pipe, and a drain valve is installed on the waste liquid pipe.

5. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, The plurality of the guide rollers include at least two sizing rollers, the sizing rollers being at least partially located within the sizing groove, and the filament bundles being held and wound around the lower end of the sizing rollers.

6. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, The drying device also includes a negative pressure control system, which includes a collection pipe and a variable frequency vacuum pump. One end of the collection pipe is connected to the top of the suction hood, and the other end of the collection pipe is connected to the variable frequency vacuum pump.

7. The sizing and drying apparatus for carbon fiber production according to claim 6, characterized in that, The negative pressure control system further includes a controller, a negative pressure sensor, and a droplet sensor. The negative pressure sensor is used to detect the pressure in the collection pipe and transmit the pressure value signal to the controller. The controller is used to control the frequency of the variable frequency vacuum pump based on the pressure value signal. The droplet sensor is used to detect the droplet concentration in the suction hood and transmit the concentration value signal to the controller. The controller is used to control the frequency of the variable frequency vacuum pump based on the concentration value signal to adjust the negative pressure value of the collection pipe.

8. The sizing and drying apparatus for carbon fiber production according to claim 6, characterized in that, The negative pressure control system also includes a filter and a condensate collection tank, the condensate collection tank being connected to the output end of the variable frequency vacuum pump through the filter.

9. The sizing and drying apparatus for carbon fiber production according to claim 1, characterized in that, The drying device also includes an anti-splash system, which includes an upper baffle and a lower baffle. The upper baffle is disposed in the circumference of the sizing tank, and the lower baffle is disposed in the circumference of the suction hood. An inlet and an outlet for feeding the yarn bundle into and out of the drying space are formed between the upper baffle and the lower baffle.

10. The sizing and drying apparatus for carbon fiber production according to claim 9, characterized in that, The anti-splash system also includes a compressed air curtain, which is disposed at the yarn inlet and the yarn outlet.

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