Discontinuous fiber orientation device and orientation method based on fluid induction method

Abstract

The invention relates to the technical field of discontinuous carbon fiber recycling, in particular to a discontinuous fiber orienting device and method based on a fluid induction method. The orienting device comprises a feeding box, a dry hopper is arranged on the feeding box, a piston vibrator is arranged at the bottom of the dry hopper, and the feeding box is used for storing water; the impeller is arranged on the side wall of the feeding box, part of the impeller penetrates into the feeding box, and the impeller is used for stirring water and discontinuous fiber powder flowing out of the dry hopper and forming fiber suspension liquid; and the supporting frame is arranged close to the feeding box, and a synchronous belt is arranged on the supporting frame. Discontinuous short carbon fibers can be recycled, and highly-oriented discontinuous fiber carbon cloth can be reproduced. Based on the structure of the novel directional spray head, the fiber density of discontinuous fiber powder orientated by the device is uniformly arranged; based on the designed multi-section orientation structure, the fiber angle orientation degree of discontinuous fibers is high.

Description

Technical Field

[0001] The invention relates to the technical field of discontinuous carbon fiber recycling, and in particular to a discontinuous fiber orientation device and an orientation method based on a fluid induction method. Background Art

[0002] With the increase of carbon fiber manufacturing waste and retired composite materials, the recycling of carbon fiber has become a hot topic. The recycling of fiber-reinforced composite materials not only helps to reduce environmental pollution, but also creates economic value through the reuse of recycled fibers. Discontinuous fiber orientation technology provides a new way for the remanufacturing of recycled fibers, which helps to achieve the recycling of carbon fiber materials.

[0003] Discontinuous fiber reinforced composites (hereinafter referred to as: DFRP) have attracted attention because of their superior manufacturability over continuous fiber composites. During the curing process of DFRP, the fibers can flow in the matrix, making automated production possible and allowing the manufacture of parts with complex shapes. However, the random arrangement of chopped fibers leads to macroscopic isotropy of the material, which fails to fully exert its performance. Through specific process treatments, such as fluid induction methods, highly directional arrangement of discontinuous short fibers can be achieved, which can significantly improve the material performance and approach the performance of continuous unidirectional fibers.

[0004] The existing discontinuous fiber orientation devices can be roughly divided into two categories based on their implementation principles: dry method and wet method. The commonly reported dry method orientation principle uses vibration assistance to achieve the oriented arrangement of discontinuous short carbon fibers. This method is usually used for discontinuous fibers with a fiber length of 10 mm or more, and the effect is better. This is because for the dry method, vibration assistance is not sensitive to short fibers.

[0005] In contrast, the discontinuous fiber orientation device using the wet method can achieve an orientation of discontinuous fibers within 10 mm in length, or even less than 5 mm, with wider adaptability and better orientation effect. The wet method uses the momentum change of the fiber suspension made by mixing dry fibers in a liquid medium to align the fibers. The orientation process usually includes three steps: fiber dispersion, alignment, and liquid medium separation. The different processes of these steps have a great influence on the orientation effect of the discontinuous fibers. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the wet method has a great influence on the orientation effect of discontinuous fibers, thereby providing a discontinuous fiber orientation device and orientation method based on a fluid induction method.

[0007] In order to solve the above technical problems, the present invention provides a discontinuous fiber orientation device based on a fluid induction method, comprising: a feed box, a dry hopper is provided on the feed box, a piston vibrator is provided at the bottom of the dry hopper, and the feed box is used to store water; an impeller is provided on the side wall of the feed box and partially penetrates into the feed box, the impeller is used to stir water and discontinuous fiber powder flowing out of the dry hopper to form a fiber suspension; a support frame is arranged close to the feed box, a synchronous belt is provided on the support frame, a water seepage box is provided in the synchronous belt, and a hydrophilic membrane is provided on the synchronous belt base; and a seepage port is provided at the bottom of the seepage box, and a water storage tank is provided at the bottom of the seepage port; a hot atmosphere generator is provided on the support frame and is located above the hydrophilic membrane base; a vacuum pump is provided at the bottom of the support frame, and the vacuum pump is connected to the seepage box; a peristaltic pump, one end of which is connected to the feed box, and the other end is connected to the conduit, and a directional nozzle is provided at the end of the conduit, and the directional nozzle is arranged corresponding to the multi-stage directional structure, the multi-stage directional structure is provided on the hydrophilic membrane base, and a predetermined gap is provided between the multi-stage directional structure and the hydrophilic membrane base.

[0008] Furthermore, the directional nozzle comprises a nozzle main body structure and a nozzle adapter, and the internal pipelines of the nozzle main body structure are staggered.

[0009] Furthermore, the internal pipelines of the nozzle main body structure are arranged in a binary tree-like arrangement.

[0010] Furthermore, the main structure of the nozzle includes a directional front plate, a directional middle plate, and a directional rear plate. A groove is provided on one side of the directional front plate and the directional rear plate, and a groove is provided on both sides of the directional middle plate. The directional front plate and the directional middle plate form a group of internal pipelines, and the directional rear plate and the directional middle plate form another group of internal pipelines.

[0011] Furthermore, the nozzle main body structure has thirty-two nozzle outlets, the diameter of the nozzle outlet is 1 mm, and the distance between two adjacent nozzle outlets is 5 mm.

[0012] Furthermore, the multi-section directional structure is arranged to include a three-section directional plate, a guide structure, and a closing plate. The three-section directional plate is arranged on the hydrophilic membrane substrate. The guide structure is arranged at the segment of the three-section directional plate, and a predetermined gap is left between the three-section directional plate and the closing plate. The closing plate is arranged on both sides of the three-section directional plate for connecting the three-section directional plate and the guide structure.

[0013] Furthermore, the angle between two of the three folding plates included in the three-section oriented plate ranges from 140° to 160°.

[0014] Furthermore, the angle between the three-section directional plate and the guide structure is 50°.

[0015] Furthermore, the gap between the three-section directional plate and the guide structure is 5 mm.

[0016] The present invention also provides an orientation method of the discontinuous fiber orientation device based on the fluid induction method, comprising:

[0017] (1) Discontinuous short fiber powder with a length of less than 10 mm is loaded into a dry hopper, dispersed by a piston vibrator and then falls into a feed box, which is filled with water with a density of 1 g / cm3 and a dynamic viscosity of 0.001 Pa·s;

[0018] (2) Through continuous stirring by the impeller, the fiber suspension obtained by mixing the discontinuous fiber powder with water is evenly distributed, and the fiber volume fraction is about 0.003%;

[0019] (3) The fiber suspension is pumped out by a peristaltic pump and flows to the directional nozzle. The directional nozzle adopts a binary tree structure and a double-sided pipeline staggered design, so that the fiber suspension sprayed by the directional nozzle falls on the multi-stage directional structure in a uniform plane;

[0020] (4) The fiber suspension flows through the segments of the multi-segment oriented structure, and the fibers impact and contact the surface of the multi-segment oriented structure to achieve fiber directional arrangement, and then fall on the hydrophilic membrane substrate with a hydrophilic surface;

[0021] (5) Due to the hydrophilic effect of the hydrophilic membrane substrate, the fiber suspension is initially separated from the oriented discontinuous fibers and water. The water passes through the hydrophilic membrane and falls into the water seepage box, and flows into the water storage tank from the water seepage port. The vacuum pump is connected to the water seepage box through a conduit. The upper surface of the water seepage box is a porous structure, and the other surfaces are closed. The water attached to the fibers is further removed by vacuum suction. At the same time, the suction effect causes the fibers to be adsorbed on the hydrophilic membrane substrate to achieve fixation.

[0022] (6) As the synchronous belt runs, the oriented discontinuous fibers are brought into a hot atmosphere generator. The hot atmosphere generator has a high temperature atmosphere of 100°C, which further dries the discontinuous fibers. Finally, dry discontinuous short fiber carbon cloth with highly oriented discontinuous fiber angles and uniform fiber density is produced.

[0023] The technical solution of the present invention has the following advantages:

[0024] 1. The discontinuous fiber orientation device based on the fluid induction method provided by the present invention comprises: a feed box, a dry hopper is provided on the feed box, a piston vibrator is provided at the bottom of the dry hopper, and the feed box is used to store water; an impeller is provided on the side wall of the feed box and partially penetrates into the feed box, and the impeller is used to stir water and discontinuous fiber powder flowing out of the dry hopper to form a fiber suspension; a support frame is arranged close to the feed box, a synchronous belt is provided on the support frame, a water seepage box is provided in the synchronous belt, and a hydrophilic membrane substrate is provided on the synchronous belt; and the A seepage port is provided at the bottom of the seepage box, and a water storage tank is provided at the bottom of the seepage port; a hot atmosphere generator is provided on the support frame and is located above the hydrophilic membrane substrate; a vacuum pump is provided at the bottom of the support frame, and the vacuum pump is connected to the seepage box; a peristaltic pump is connected to the feed box at one end and to a conduit at the other end, and a directional nozzle is provided at the end of the conduit, the directional nozzle is arranged corresponding to a multi-stage directional structure, the multi-stage directional structure is provided on the hydrophilic membrane substrate, and a predetermined gap is provided between the multi-stage directional structure and the hydrophilic membrane substrate.

[0025] The discontinuous fiber orientation device based on the fluid induction method can realize the recycling of discontinuous short carbon fibers and reproduce highly oriented discontinuous fiber carbon cloth. Based on the fluid induction method, the oriented arrangement of discontinuous short fibers with a length of only less than ten millimeters, that is, a few millimeters, can be achieved; based on the structure of the new oriented nozzle, the fiber density of the discontinuous fiber powder oriented by the device is evenly arranged; based on the designed multi-stage oriented structure, the fiber angle orientation degree of the discontinuous fibers is high; the limited orientation device has a high degree of integration, and the continuous whole process from the input of discontinuous dry fiber material to the processing into oriented short fiber carbon cloth can be completed by itself, thereby increasing the orientation efficiency and achieving a better orientation effect.

[0026] 2. The discontinuous fiber orientation device based on the fluid induction method provided by the present invention comprises a orientation nozzle including a nozzle main structure and a nozzle adapter, and the internal pipes of the nozzle main structure are arranged in a staggered manner. By staggering the internal pipes of the two groups of nozzle main structures, it is convenient to spray the fiber suspension from the orientation nozzle into the multi-stage orientation structure, realizing the transformation of the fiber suspension from point injection to surface injection, and ensuring the uniform density arrangement of the fibers.

[0027] 3. The discontinuous fiber orientation device based on the fluid induction method provided by the present invention has internal pipelines of the nozzle main structure arranged in a binary tree-like arrangement, and the structure of this arrangement has a certain regularity, making the processing more convenient.

[0028] 4. The discontinuous fiber orientation device based on the fluid induction method provided by the present invention has a nozzle main body structure with thirty-two nozzle outlets; the diameter of the nozzle outlet is 1 mm, and the distance between two adjacent nozzle outlets is 5 mm. This arrangement ensures that the density of the fibers is evenly arranged.

[0029] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic structural diagram of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0032] Figure 2 A schematic diagram of the structure of a water seepage box of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0033] Figure 3 A schematic structural diagram of a multi-stage orientation structure of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0034] Figure 4 A schematic structural diagram of a three-section oriented plate of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0035] Figure 5 A schematic structural diagram of a guide structure of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0036] Figure 6 A schematic diagram of the structure of an orientation nozzle of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0037] Figure 7 A perspective view of a directional nozzle of a discontinuous fiber directional device based on a fluid induction method provided by the present invention;

[0038] Figure 8 A schematic diagram of the bottom structure of an orientation nozzle of a discontinuous fiber orientation device based on a fluid induction method provided by the present invention;

[0039] Fig. 9 An exploded view of the orienting nozzle of the discontinuous fiber orienting device based on the fluid induction method provided by the present invention.

[0040] Description of reference numerals:

[0041] 1. Feed box; 2. Dry material hopper; 3. Piston vibrator; 4. Impeller; 5. Support frame; 6. Synchronous belt; 7. Seepage box; 8. Hydrophilic membrane substrate; 9. Seepage port; 10. Water storage tank; 11. Hot atmosphere generator; 12. Vacuum pump; 13. Peristaltic pump; 14. Catheter; 15. Directional nozzle; 16. Multi-section directional structure; 17. Nozzle main structure; 18. Directional front plate; 19. Directional middle plate; 20. Directional rear plate; 21. Groove; 22. Nozzle adapter; 23. Nozzle outlet; 24. Three-section directional plate; 25. Guide structure; 26. Closing plate; 27. First-section directional plate; 28. Second-section directional plate; 29. ​​Third-section directional plate. DETAILED DESCRIPTION

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0043] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0045] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0047] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0048] See also Figures 1 to 9As shown, the present invention provides a discontinuous fiber orientation device based on a fluid induction method, comprising: a feed box 1, on which a dry hopper 2 is provided, and a piston vibrator 3 is provided at the bottom of the dry hopper 2, and the feed box 1 is used to store water; an impeller 4 is provided on the side wall of the feed box 1 and partially penetrates into the feed box 1, and the impeller 4 is used to stir water and discontinuous fiber powder flowing out of the dry hopper 2 to form a fiber suspension; a support frame 5 is arranged close to the feed box 1, and a synchronous belt 6 is provided on the support frame 5, and a water seepage box 7 is provided in the synchronous belt 6, and a hydrophilic membrane substrate 8 is provided on the synchronous belt 6; and the water seepage box 7 has a A water seepage port 9 is provided at the bottom, and a water storage tank 10 is provided at the bottom of the water seepage port 9; a hot atmosphere generator 11 is provided on the support frame 5 and is located above the hydrophilic membrane substrate 8; a vacuum pump 12 is provided at the bottom of the support frame 5, and the vacuum pump 12 is connected to the water seepage box 7; a peristaltic pump 13 is connected to the feed box 1 at one end and to the conduit 14 at the other end, and a directional nozzle 15 is provided at the end of the conduit 14, and the directional nozzle 15 is arranged corresponding to the multi-stage directional structure 16, and the multi-stage directional structure 16 is provided on the hydrophilic membrane substrate 8, and a predetermined gap is provided between the multi-stage directional structure 16 and the hydrophilic membrane substrate 8.

[0049] The discontinuous fiber orientation device based on the fluid induction method can realize the recycling of discontinuous short carbon fibers and reproduce highly oriented discontinuous fiber carbon cloth. Based on the fluid induction method, the oriented arrangement of discontinuous short fibers with a length of only less than ten millimeters, that is, a few millimeters, can be realized; based on the structure of the new oriented nozzle 15, the fiber density of the discontinuous fiber powder oriented by the device is evenly arranged; based on the designed multi-stage oriented structure 16, the fiber angle orientation degree of the discontinuous fibers is high; the limited orientation device has a high degree of integration, and the continuous whole process from inputting discontinuous dry fiber materials to processing into oriented short fiber carbon cloth can be completed by itself, thereby increasing the orientation efficiency and achieving a better orientation effect.

[0050] There are rotating shafts at both ends of the support frame 5 , and the synchronous belt 6 is sleeved on the rotating shafts. The rotating shafts can be driven by a motor to rotate, thereby driving the synchronous belt 6 to rotate.

[0051] In some optional embodiments, the directional nozzle 15 includes a nozzle main structure 17, and the internal pipelines of the nozzle main structure 17 are staggered. Through the staggered arrangement of the internal pipelines of the nozzle main structure 17, it is convenient to spray the fiber suspension from the directional nozzle 15 into the multi-stage directional structure 16, so that the fiber suspension is transformed from point injection to surface injection, ensuring uniform density arrangement of the fibers.

[0052] In this embodiment, the internal pipelines of the nozzle main structure 17 are arranged in a binary tree-like arrangement, and the structure of this arrangement has a certain regularity, making the processing more convenient.

[0053] Specifically, the nozzle main structure 17 includes a directional front plate 18, a directional middle plate 19, and a directional rear plate 20. A groove 21 is provided on one side of the directional front plate 18 and the directional rear plate 20, and a groove 21 is provided on both sides of the directional middle plate 19. The directional front plate 18 and the directional middle plate 19 form a group of internal pipelines, and the directional rear plate 20 and the directional middle plate 19 form another group of internal pipelines.

[0054] The nozzle inlet 22 is arranged above the directional front plate 18, the directional middle plate 19 and the directional rear plate 20, and is connected to two groups of directional pipelines.

[0055] In this embodiment, the nozzle main body structure 17 has thirty-two nozzle outlets 23; of course, the number of nozzles can be set according to actual conditions.

[0056] The diameter of the nozzle outlet 23 is 1 mm, and the distance between two adjacent nozzle outlets 23 is 5 mm. This arrangement ensures that the density of the fibers is evenly arranged.

[0057] In some optional embodiments, the multi-section oriented structure 16 is provided to include a three-section oriented plate 24, a guide structure 25, and a closing plate 26. The three-section oriented plate 24 is provided on the hydrophilic membrane substrate 8. The guide structure 25 is provided at the connection of the three-section oriented plate 24, and a predetermined gap is left between the guide structure 25 and the three-section oriented plate 24. The closing plate 26 is provided on both sides of the three-section oriented plate 24, and is used to connect the three-section oriented plate 24 and the guide structure 25.

[0058] The closing plates 26 are arranged on both sides of the three-section directional plate 24 , which can better connect the three-section directional plate 24 and the guide structure 25 , thereby ensuring the connection stability between the three-section directional plate 24 and the guide structure 25 .

[0059] Meanwhile, the three-section oriented plate 24 has the third section oriented plate 29 close to the hydrophilic membrane substrate 8 , the middle section oriented plate 28 , and the first section oriented plate 27 on the side of the second section oriented plate 28 away from the third section oriented plate 29 .

[0060] Specifically, the angle between the three folding plates of the three-section oriented plate 24 is 140°-160°, and the angle between the three-section oriented plate 24 and the guide structure 25 is 50°. Within this angle range, the orientation effect of the short fibers after flowing through the oriented plate is optimal.

[0061] The gap between the three-section directional plate 24 and the guide structure 25 is 5 mm.

[0062] The present invention also provides an orientation method using a discontinuous fiber orientation device based on a fluid induction method, comprising:

[0063] (1) Discontinuous short fiber powder with a length of less than 10 mm is loaded into a dry material hopper 2, dispersed by a piston vibrator 3 and then falls into a feed box 1, which is filled with water with a density of 1 g / cm3 and a dynamic viscosity of 0.001 Pa·s;

[0064] (2) The fiber suspension obtained by mixing the discontinuous fiber powder and water is uniformly distributed through continuous stirring by the impeller 4, and the fiber volume fraction is about 0.003%;

[0065] (3) The fiber suspension is pumped out by the peristaltic pump 13 and flows to the directional nozzle 15. The directional nozzle 15 adopts a binary tree structure and a double-sided pipeline staggered design, so that the fiber suspension sprayed by the directional nozzle 15 falls on the multi-stage directional structure 16 in a uniform plane.

[0066] (4) The fiber suspension flows through the segments of the multi-segment oriented structure 16, and the fibers impact and contact the surface of the multi-segment oriented structure 16 to achieve fiber directional arrangement, and then fall on the hydrophilic membrane substrate 8 having a hydrophilic surface;

[0067] (5) Due to the hydrophilic effect of the hydrophilic membrane substrate 8, the oriented discontinuous fibers of the fiber suspension are initially separated from the water. The water passes through the hydrophilic membrane and falls into the water seepage box 7, and flows into the water storage tank 10 from the water seepage port 9. The vacuum pump 12 is connected to the water seepage box 7 through the conduit 14. The upper surface of the water seepage box 7 is a porous structure, and the other surfaces are closed. The water attached to the fibers is further removed by vacuum suction. At the same time, the suction effect makes the fibers adsorbed on the hydrophilic membrane substrate 8 to achieve fixation;

[0068] (6) As the synchronous belt 6 runs, the oriented discontinuous fibers are brought into the hot atmosphere generator 11. The hot atmosphere generator 11 has a high-temperature atmosphere of 100°C, which further dries the discontinuous fibers. Finally, dry discontinuous short fiber carbon cloth with highly oriented discontinuous fiber angles and uniform fiber density is produced.

[0069] The discontinuous fiber orientation device based on the fluid induction method includes the following steps in actual use:

[0070] 1) Fiber dispersion and suspension formation

[0071] Discontinuous short carbon fiber powder with a fiber length of 3 mm, a diameter of 7 μm and a density of 1.82 g / cm3 is loaded into a dry hopper 2, dispersed by a piston vibrator 3 and then falls into a feed box 1, wherein the feed box 1 is filled with water with a density of 1 g / cm3 and a dynamic viscosity of 0.001 Pa·s; the impeller 4 rotates at a high speed to evenly stir the fiber suspension obtained by mixing the discontinuous short carbon fiber powder with water, and the fiber volume fraction of the obtained suspension is approximately 0.003%.

[0072] 2) Fiber suspension pumping process

[0073] The peristaltic pump 13 connected to the feed box 1 pumps out the fiber suspension, which flows to the directional nozzle 15 through the conduit 14. The front and rear pipes inside the directional nozzle 15 are staggered. The nozzle is designed with 32 outlets with an outlet diameter of 1 mm and a spacing of only 5 mm. Due to the surface tension of the liquid, the fiber suspension at the outlet of the directional nozzle 15 will be attached together, so that the fiber suspension sprayed from the nozzle falls onto the directional plate in a uniform plane.

[0074] 3) Discontinuous fiber orientation link

[0075] The multi-segment oriented structure 16 adopts a three-segment structure, introducing three angle changes. The fiber suspension flows through the segments of the multi-segment oriented structure 16, and the fibers impact and contact with the surface of the three-segment oriented plate 24 to achieve fiber oriented arrangement.

[0076] When the suspension passes through the first section, the fiber orientation degree is the lowest, so this section is set to be the longest, so that the first contact impact is more complete. As the fiber orientation degree increases, the lengths of the second and third sections gradually decrease; the guide structure 25 can effectively make the fiber suspension fully gather at the segmented position, and the closing plate 26 can prevent the suspension from flowing down from the side of the three-section oriented plate 24; the discontinuous fibers are oriented and arranged through the three-section oriented plate 24, and then fall on the hydrophilic membrane substrate 8 with a hydrophilic surface;

[0077] 4) Liquid medium separation

[0078] The hydrophilic membrane substrate 8 uses a hydrophilic filter mesh with a surface gap of only 1mm, which can effectively prevent the fibers from being blocked by mistake while water seepage; the natural seepage of water caused by the hydrophilic effect realizes the preliminary separation of discontinuous fibers and water, and the water falls into the seepage box 7 through the seepage port 9 and flows into the water storage tank 10;

[0079] The vacuum pump 12 is connected to the water seepage box 7 through the conduit 14. The upper surface of the water seepage box 7 is a porous structure, and the other surfaces are closed. Through the vacuum suction effect, the water attached to the fiber is further separated, and at the same time, the suction effect makes the fiber adsorbed on the hydrophilic filter mesh to achieve fixation;

[0080] As the synchronous belt 6 runs, the fibers fixed on the gauze are brought into the hot atmosphere generator 11. The inside of the hot atmosphere generator 11 is a high-temperature atmosphere of 100°C, which further dries the fibers. After drying, the gauze is removed to produce dry discontinuous short fiber carbon cloth with highly oriented fiber angles and uniform fiber density.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A discontinuous fiber orientation device based on a fluid induction method, characterized in that: include: A feed box (1), wherein a dry material hopper (2) is provided on the feed box (1), a piston vibrator (3) is provided at the bottom of the dry material hopper (2), and the feed box (1) is used to store water; An impeller (4) is arranged on the side wall of the feed box (1) and partially penetrates into the feed box (1), and the impeller (4) is used to stir water and discontinuous fiber powder flowing out of the dry material hopper (2) to form a fiber suspension; A support frame (5) is arranged close to the feed box (1), a synchronous belt (6) is arranged on the support frame (5), a water seepage box (7) is arranged inside the synchronous belt (6), and a hydrophilic membrane substrate (8) is arranged on the synchronous belt (6); a water seepage port (9) is arranged at the bottom of the water seepage box (7), and a water storage tank (10) is arranged at the bottom of the water seepage port (9); A hot atmosphere generator (11) is disposed on the support frame (5) and is located above the hydrophilic membrane substrate (8); A vacuum pump (12) is arranged at the bottom of the support frame (5), and the vacuum pump (12) is connected to the water seepage box (7); A peristaltic pump (13) is connected to the feed box (1) at one end and to the conduit (14) at the other end, and a directional nozzle (15) is provided at the end of the conduit (14), and the directional nozzle (15) is provided corresponding to the multi-segment directional structure (16), and the multi-segment directional structure (16) is provided on the hydrophilic membrane substrate (8), and a predetermined gap is provided between the multi-segment directional structure (16) and the hydrophilic membrane substrate (8).

2. A discontinuous fiber orientation device based on a fluid induction method according to claim 1, characterized in that: The directional nozzle (15) comprises a nozzle main body structure (17) and a nozzle adapter (22), and the internal pipelines of the nozzle main body structure (17) are arranged in a staggered manner.

3. A discontinuous fiber orientation device based on a fluid induction method according to claim 2, characterized in that: The internal pipelines of the nozzle main body structure (17) are arranged in a binary tree-like arrangement.

4. The discontinuous fiber orientation device based on the fluid induction method according to claim 2, characterized in that: The nozzle main structure (17) comprises a directional front plate (18), a directional middle plate (19), and a directional rear plate (20); one side of the directional front plate (18) and the directional rear plate (20) is provided with a groove (21); both sides of the directional middle plate (19) are provided with grooves (21); the directional front plate (18) and the directional middle plate (19) form a group of internal pipelines; the directional rear plate (20) and the directional middle plate (19) form another group of internal pipelines.

5. A discontinuous fiber orientation device based on a fluid induction method according to any one of claims 2 to 4, characterized in that: The nozzle main body structure (17) has thirty-two nozzle outlets (23), the diameter of the nozzle outlets (23) is 1 mm, and the distance between two adjacent nozzle outlets (23) is 5 mm.

6. The discontinuous fiber orientation device based on the fluid induction method according to claim 5, characterized in that: The multi-section oriented structure (16) is provided with a three-section oriented plate (24), a guide structure (25), and a closing plate (26); the three-section oriented plate (24) is provided on the hydrophilic membrane substrate (8); the guide structure (25) is provided at the segment of the three-section oriented plate (24), and a predetermined gap is left between the guide structure (25) and the three-section oriented plate (24); the closing plate (26) is provided on both sides of the three-section oriented plate (24), and is used to connect the three-section oriented plate (24) and the guide structure (25).

7. The discontinuous fiber orientation device based on the fluid induction method according to claim 6, characterized in that: The angle between two of the three folding plates included in the three-section oriented plate (24) is in the range of 140°-160°.

8. The discontinuous fiber orientation device based on the fluid induction method according to claim 7, characterized in that: The angle between the three-section directional plate (24) and the guide structure (25) is 50°.

9. The discontinuous fiber orientation device based on the fluid induction method according to claim 8, characterized in that: The gap between the three-section directional plate (24) and the guide structure (25) is 5 mm.

10. An orientation method for discontinuous fibers using the fluid-induced discontinuous fiber orientation device according to any one of claims 1 to 9, characterized in that: include: (1), discontinuous short fiber powder with a length of less than 10 mm is loaded into a dry material hopper (2), dispersed by a piston vibrator (3) and then dropped into a feed box (1), wherein the feed box (1) is filled with water with a density of 1 g / cm3 and a dynamic viscosity of 0.001 Pa·s; (2) by continuous stirring of an impeller (4), a fiber suspension obtained by mixing discontinuous fiber powder and water is evenly distributed, and the fiber volume fraction is about 0.003%; (3) The fiber suspension is pumped out by a peristaltic pump (13) and flows to a directional nozzle (15). The directional nozzle (15) has a binary tree structure and a double-sided pipeline staggered design, so that the fiber suspension sprayed by the directional nozzle (15) falls onto the multi-stage directional structure (16) in a uniform plane. (4), the fiber suspension flows through the segmented parts of the multi-segment oriented structure (16), the fibers impact and contact the surface of the multi-segment oriented structure (16), and the fibers are aligned, and then fall on the hydrophilic membrane substrate (8) having a hydrophilic surface; (5), due to the hydrophilic effect of the hydrophilic membrane substrate (8), the oriented discontinuous fibers of the fiber suspension are initially separated from the water, and the water passes through the hydrophilic membrane and falls into the water seepage box (7), and flows into the water storage tank (10) from the water seepage port (9). The vacuum pump (12) is connected to the water seepage box (7) through the conduit (14). The upper surface of the water seepage box (7) is a porous structure, and the other surfaces are closed. The water attached to the fibers is further removed by vacuum suction, and at the same time, the suction effect causes the fibers to be adsorbed on the hydrophilic membrane substrate (8) to achieve fixation; (6), with the operation of the synchronous belt (6), the oriented discontinuous fibers are brought into the hot atmosphere generator (11), and the hot atmosphere generator (11) has a high temperature atmosphere of 100°C, so as to further dry the discontinuous fibers, and finally produce dry discontinuous short fiber carbon cloth with highly oriented fiber angles and uniform fiber density.

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