A discontinuous fiber orientation device and method based on fluid induction

Abstract

The present application relates to the technical field of discontinuous carbon fiber recycling, and particularly relates to a discontinuous fiber orientation device and orientation method based on a fluid induction method; the orientation device comprises: a feeding tank, a dry hopper is arranged on the feeding tank, a piston vibrator is arranged at the bottom of the dry hopper, and the feeding tank is used for storing water; an impeller is arranged on the side wall of the feeding tank and partially penetrates into the feeding tank, the impeller is used for stirring the water and the discontinuous fiber powder flowing out of the dry hopper, and a fiber suspension is formed; a support frame is arranged close to the feeding tank, and a synchronous belt is arranged on the support frame. The discontinuous short carbon fiber can be recycled to produce highly oriented discontinuous fiber carbon cloth. Based on the structure of the new type of orientation nozzle, the fiber density of the discontinuous fiber powder oriented by the device is uniformly arranged; based on the designed multi-section orientation structure, the fiber angle orientation degree of the discontinuous fiber is high.

Description

Technical Field

[0001] This invention relates to the field of discontinuous carbon fiber recycling technology, specifically to a discontinuous fiber orientation device and orientation method based on a fluid-induced method. Background Technology

[0002] With the increase in waste from carbon fiber manufacturing and decommissioned composite materials, the recycling of carbon fiber has become a hot topic. Recycling fiber-reinforced composites not only helps reduce environmental pollution but also creates economic value through the reuse of recycled fibers. Discontinuous fiber orientation technology provides a new approach for the remanufacturing of recycled fibers, facilitating the circular utilization of carbon fiber materials.

[0003] Discontinuous fiber-reinforced composites (DFRPs) have attracted attention due to their superior manufacturability compared to continuous fiber composites. During the curing process, the fibers in DFRPs can flow within the matrix, enabling automated production and allowing the fabrication of complex-shaped components. However, the random arrangement of chopped fibers results in macroscopic isotropy of the material, failing to fully realize its potential. Through specific processing methods, such as fluid-induced methods, achieving a highly oriented arrangement of discontinuous short fibers can significantly improve material properties, approaching the performance of continuous unidirectional fibers.

[0004] Existing discontinuous fiber orientation devices can be broadly categorized into two types based on their operating principles: dry and wet methods. The commonly reported dry orientation principle utilizes vibration assistance to achieve the directional alignment of discontinuous short carbon fibers. This method typically yields better results for discontinuous fibers with lengths of 10 mm or more, because vibration assistance is less sensitive to short fibers in the dry method.

[0005] In contrast, wet-process discontinuous fiber orientation devices can achieve discontinuous fiber lengths within 10 mm, or even less than 5 mm, offering wider adaptability and better orientation results. The wet process utilizes the momentum change of a fiber suspension made by mixing dry fibers in a liquid medium to align the fibers. The orientation process typically includes three steps: fiber dispersion, alignment, and liquid medium separation. Different processes in these steps significantly impact 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 that wet methods in the prior art have a great influence on the orientation effect of discontinuous fibers, thereby providing a discontinuous fiber orientation device and orientation method based on fluid induction.

[0007] To address the aforementioned technical problems, this invention provides a discontinuous fiber orientation device based on a fluid-induced method, comprising: a feed box with a dry hopper on it, a piston vibrator at the bottom of the dry hopper, and the feed box for storing water; an impeller disposed on the side wall of the feed box and partially extending into it, the impeller for agitating the water and discontinuous fiber powder flowing from the dry hopper to form a fiber suspension; and a support frame disposed near the feed box, a synchronous belt mounted on it, a water infiltration tank within the synchronous belt, and a hydrophilic membrane mounted on the synchronous belt. The substrate includes a seepage port at the bottom of the seepage tank and a water storage tank at the bottom of the seepage port; a thermal atmosphere generator mounted on the support frame and positioned above the hydrophilic membrane substrate; a vacuum pump located at the bottom of the support frame and connected to the seepage tank; and a peristaltic pump with one end connected to the feed box and the other end connected to a conduit, wherein a directional nozzle is provided at the end of the conduit, the directional nozzle corresponding to a multi-segment directional structure, the multi-segment directional structure being mounted on the hydrophilic membrane substrate, and a predetermined gap being provided between the multi-segment directional structure and the hydrophilic membrane substrate.

[0008] Furthermore, the directional nozzle includes a nozzle body structure and a nozzle adapter, and the internal pipelines of the nozzle body structure are arranged in an interlaced manner.

[0009] Furthermore, the internal piping of the nozzle body structure is arranged in a bifurcation tree-like pattern.

[0010] Furthermore, the main structure of the nozzle includes a front directional plate, a middle directional plate, and a rear directional plate. The front directional plate and the rear directional plate have grooves on one side, and the middle directional plate has grooves on both sides. The front directional plate and the middle directional plate form one set of internal pipes, and the rear directional plate and the middle directional plate form another set of internal pipes.

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

[0012] Furthermore, the multi-segment orientation structure includes a three-segment orientation plate, a guide structure, and a sealing plate. The three-segment orientation plate is disposed on the hydrophilic membrane substrate. The guide structure is disposed at the segment of the three-segment orientation plate and has a predetermined gap with the three-segment orientation plate. The sealing plate is disposed on both sides of the three-segment orientation plate and is used to connect the three-segment orientation plate and the guide structure.

[0013] Furthermore, the angle range between each pair of the three folds in the three-section directional plate is 140°-160°.

[0014] Furthermore, the included 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 5mm.

[0016] The present invention also provides an orientation method for the discontinuous fiber orientation device based on the fluid-induced 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 containing a density of 1 g / cm³. 3 Water with a dynamic viscosity of 0.001 Pa·s;

[0018] (2) The fiber suspension after the discontinuous fiber powder and water are uniformly distributed by the continuous stirring of the impeller, 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 bifurcation tree structure and a double-sided pipeline design to ensure that the fiber suspension sprayed out by the directional nozzle falls onto the multi-segment directional structure in a uniform planar shape.

[0020] (4) The fiber suspension flows through the segment of the multi-segment oriented structure, and the fiber impacts the surface of the multi-segment oriented structure to achieve fiber orientation and then falls onto the hydrophilic membrane substrate with a hydrophilic surface.

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

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

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

[0024] 1. The present invention provides a discontinuous fiber orientation device based on a fluid-induced method, comprising: a feed box, wherein a dry hopper is provided on the feed box, and a piston vibrator is provided at the bottom of the dry hopper, and the feed box is used to store water; an impeller, disposed on the side wall of the feed box and partially extending into the feed box, the impeller being used to stir the water and discontinuous fiber powder flowing out from the dry hopper, and forming a fiber suspension; a support frame, disposed near the feed box, wherein a synchronous belt is provided on the support frame, a water infiltration tank is provided within the synchronous belt, and a hydrophilic membrane substrate is provided on the synchronous belt; and the... The bottom of the seepage tank is provided with a seepage port, and a water storage tank is located at the bottom of the seepage port; a hot atmosphere generator is located on the support frame and above the hydrophilic membrane substrate; a vacuum pump is located at the bottom of the support frame and is connected to the seepage tank; a peristaltic pump is connected at one end to the feed box and at the other end to the conduit, and a directional nozzle is provided at the end of the conduit. The directional nozzle is configured to correspond to a multi-segment directional structure, which is located on the hydrophilic membrane substrate, and a predetermined gap is provided between the multi-segment directional structure and the hydrophilic membrane substrate.

[0025] This fluid-induced discontinuous fiber orientation device can recycle discontinuous short carbon fibers and reprocess them into highly oriented discontinuous fiber carbon cloth. Based on the fluid-induced method, it can achieve the oriented arrangement of discontinuous short fibers with lengths of less than ten millimeters, i.e., a few millimeters. Based on the structure of the novel orientation nozzle, the fiber density of the discontinuous fiber powder oriented by this device is uniform. Based on the designed multi-segment orientation structure, it achieves a high degree of fiber angle orientation of the discontinuous fibers. The fiber orientation device has a high degree of integration; the entire continuous process from feeding discontinuous dry fiber material to processing it into oriented short fiber carbon cloth can be completed autonomously, thereby increasing orientation efficiency and achieving better orientation results.

[0026] 2. The discontinuous fiber orientation device based on a fluid-induced method provided by the present invention includes an orientation nozzle comprising a nozzle body structure and a nozzle adapter, wherein the internal pipes of the nozzle body structure are arranged in an interlaced manner. By interlacing the internal pipes of the two sets of nozzle body structures, the fiber suspension is easily sprayed from the orientation nozzle into the multi-segment orientation structure, realizing the transformation of the fiber suspension from point spraying to surface spraying, and ensuring uniform fiber density arrangement.

[0027] 3. The discontinuous fiber orientation device based on fluid induction method provided by the present invention has an internal pipeline arrangement in a bifurcation tree-like manner in the main structure of the nozzle. The structure of this arrangement has a certain regularity, which makes 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 body structure with thirty-two nozzle outlets; the diameter of the nozzle outlet is 1mm, and the distance between two adjacent nozzle outlets is 5mm. This arrangement ensures that the fiber density is uniformly arranged.

[0029] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0032] Figure 2 A schematic diagram of the permeation tank of the discontinuous fiber orientation device based on the fluid induction method provided by the present invention;

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

[0034] Figure 4 A schematic diagram of the structure of a three-segment orientation plate for a discontinuous fiber orientation device based on a fluid-induced method provided by the present invention;

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

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

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

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

[0039] Figure 9 An exploded view of the directional nozzle of the discontinuous fiber directional device based on the fluid-induced method provided by the present invention.

[0040] Explanation of reference numerals in the attached figures:

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

[0042] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0043] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure 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 disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0045] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0047] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0048] Please see Figures 1 to 9As shown, this invention provides a discontinuous fiber orientation device based on a fluid-induced 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; the feed box 1 is used to store water; an impeller 4 is disposed on the side wall of the feed box 1 and partially extends into the feed box 1; the impeller 4 is used to stir the water and discontinuous fiber powder flowing out from the dry hopper 2 to form a fiber suspension; a support frame 5 is disposed near the feed box 1; a synchronous belt 6 is provided on the support frame 5; a water infiltration tank 7 is disposed within the synchronous belt 6; and a hydrophilic membrane substrate 8 is disposed on the synchronous belt 6; and the water infiltration tank 7... A seepage port 9 is provided at the bottom, and a water storage tank 10 is provided at the bottom of the seepage port 9; a hot atmosphere generator 11 is provided on the support frame 5 and located above the hydrophilic membrane substrate 8; a vacuum pump 12 is provided at the bottom of the support frame 5 and is connected to the seepage tank 7; a peristaltic pump 13 is connected at one end to the feed box 1 and at the other end to the conduit 14, and a directional nozzle 15 is provided at the end of the conduit 14. The directional nozzle 15 is provided corresponding to the multi-segment directional structure 16, which 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.

[0049] This fluid-induced discontinuous fiber orientation device can recycle discontinuous short carbon fibers and reprocess them into highly oriented discontinuous fiber carbon cloth. Based on the fluid-induced method, it can achieve the oriented arrangement of discontinuous short fibers with lengths of less than ten millimeters, i.e., a few millimeters. Based on the structure of the novel orientation nozzle 15, the fiber density of the discontinuous fiber powder oriented by this device is uniform. Based on the designed multi-segment orientation structure 16, a high degree of fiber angle orientation of the discontinuous fibers is achieved. This fiber orientation device has a high degree of integration; the entire continuous process from inputting discontinuous dry fiber material to processing it into oriented short fiber carbon cloth can be completed autonomously, thereby increasing orientation efficiency and achieving better orientation results.

[0050] The support frame 5 has rotating shafts at both ends, and the synchronous belt 6 is fitted 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 body structure 17, and the internal pipes of the nozzle body structure 17 are arranged in an interlaced manner. The interlaced arrangement of the internal pipes of the nozzle body structure 17 facilitates the spraying of the fiber suspension from the directional nozzle 15 into the multi-segment directional structure 16, transforming the fiber suspension from point spraying to surface spraying and ensuring uniform fiber density.

[0052] In this embodiment, the internal pipes of the nozzle body structure 17 are arranged in a bifurcation tree-like pattern. This arrangement has a certain regularity, making processing more convenient.

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

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

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

[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 fiber density is uniformly arranged.

[0057] In some optional embodiments, the multi-segment orientation structure 16 includes a three-segment orientation plate 24, a guide structure 25, and a sealing plate 26. The three-segment orientation plate 24 is disposed on the hydrophilic membrane substrate 8. The guide structure 25 is disposed at the connection of the three-segment orientation plate 24 and has a predetermined gap with the three-segment orientation plate 24. The sealing plate 26 is disposed on both sides of the three-segment orientation plate 24 and is used to connect the three-segment orientation plate 24 and the guide structure 25.

[0058] The sealing plate 26 is set on both sides of the three-section orientation plate 24, which can better connect the three-section orientation plate 24 and the guide structure 25, thereby ensuring the connection stability of the three-section orientation plate 24 and the guide structure 25.

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

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

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

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

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

[0064] (2) By continuously stirring the impeller 4, the fiber suspension after the discontinuous fiber powder and water are evenly distributed, 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 bifurcation tree structure and a double-sided pipeline design to ensure that the fiber suspension sprayed by the directional nozzle 15 falls onto the multi-segment directional structure 16 in a uniform planar shape.

[0066] (4) The fiber suspension flows through the segment of the multi-segment oriented structure 16, and the fiber impacts the surface of the multi-segment oriented structure 16 to achieve fiber orientation and then falls onto the hydrophilic membrane substrate 8 with a hydrophilic surface.

[0067] (5) Due to the hydrophilic effect of the hydrophilic membrane substrate 8, the well-oriented discontinuous fibers of the fiber suspension are initially separated from the water. The water passes through the hydrophilic membrane and falls into the seepage tank 7, and flows into the water storage tank 10 through the seepage port 9. The vacuum pump 12 is connected to the seepage tank 7 through the conduit 14. The upper surface of the seepage tank 7 is a porous structure, and the other surfaces are closed. The water attached to the fiber is further removed by vacuum suction. At the same time, the suction action makes the fiber 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 is filled with a high temperature atmosphere of 100°C, which further dries the discontinuous fibers and finally produces dry discontinuous short fiber carbon cloth with highly oriented discontinuous fiber angle and uniform fiber density.

[0069] This discontinuous fiber orientation device based on a fluid-induced method includes the following steps in practical use:

[0070] 1) Fiber dispersion and suspension formation stage

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

[0072] 2) Fiber suspension pumping stage

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

[0074] 3) Discontinuous fiber orientation process

[0075] The multi-segment orientation structure 16 adopts a three-segment structure, introducing three angle changes. When the fiber suspension flows through the segment of the multi-segment orientation structure 16, the fiber impacts and contacts the surface of the three-segment orientation plate 24, thereby achieving fiber orientation.

[0076] When the suspension passes through the first section, the fiber orientation is the lowest, so this section is set to be the longest to ensure a more sufficient initial impact. As the fiber orientation increases, the lengths of the second and third sections gradually decrease. The guiding structure 25 can effectively allow the fiber suspension to fully accumulate at the segmentation points, and the sealing plate 26 can prevent the suspension from flowing down from the side of the three-section orientation plate 24. The discontinuous fibers are oriented and arranged through the three-section orientation plate 24 and then fall onto the hydrophilic membrane substrate 8 with a hydrophilic surface.

[0077] 4) Liquid medium separation stage

[0078] The hydrophilic membrane substrate 8 uses a hydrophilic filter mesh with a surface pore size of only 1mm, which can effectively prevent fibers from clogging while allowing water to seep in; the natural seepage of water caused by the hydrophilic effect achieves the initial separation of discontinuous fibers and water, and the water falls through the mesh into the seepage tank 7 and flows into the water storage tank 10 through the seepage port 9.

[0079] The vacuum pump 12 is connected to the seepage tank 7 by the conduit 14. The upper surface of the seepage tank 7 has a porous structure, while the other surfaces are sealed. Through the vacuum suction, the water attached to the fiber is further separated. At the same time, the suction causes the fiber to be adsorbed onto the hydrophilic filter mesh for fixation.

[0080] As the synchronous belt 6 runs, the fibers fixed on the yarn are brought into the hot atmosphere generator 11. The hot atmosphere generator 11 is filled with a high temperature atmosphere of 100°C to further dry the fibers. After drying, the yarn 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 illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A discontinuous fiber orientation device based on fluid induction method, characterized by, The utility model relates to a kind of continuous fiber suspension liquid production device, including: Feed tank (1), which is provided with a dry hopper (2) on the feed tank (1), the bottom of the dry hopper (2) is provided with a piston vibrator (3), and the feed tank (1) is used to store water. An impeller (4) is provided on the side wall of the feed tank (1) and partially extends into the feed tank (1). The impeller (4) is used to stir the water and the discontinuous fiber powder flowing out of the dry hopper (2), and form a fiber suspension. A support frame (5) is provided near the feed tank (1), and a synchronous belt (6) is provided on the support frame (5). The synchronous belt (6) is provided with a water infiltration tank (7) inside, and a hydrophilic membrane substrate (8) is provided on the synchronous belt (6). The bottom of the water infiltration tank (7) is provided with a water infiltration opening (9), and a water storage tank (10) is provided at the bottom of the water infiltration opening (9). A thermal atmosphere generator (11) is provided on the support frame (5) and above the hydrophilic membrane substrate (8). A vacuum pump (12) is provided at the bottom of the support frame (5) and connected to the water infiltration tank (7). A peristaltic pump (13) is connected to the feed tank (1) at one end and connected to a catheter (14) at the other end. A directional nozzle (15) is provided at the end of the catheter (14). The directional nozzle (15) corresponds to a multi-section directional structure (16) provided on the hydrophilic membrane substrate (8). A predetermined gap is provided between the multi-section directional structure (16) and the hydrophilic membrane substrate (8). The directional nozzle (15) includes a nozzle main body structure (17) and a nozzle adapter (22). The internal pipeline of the nozzle main body structure (17) is staggered. The internal pipeline of the nozzle main body structure (17) is arranged in a bifurcated tree shape. The multi-section directional structure (16) includes a three-section directional plate (24), a guide structure (25), and a closure plate (26). The three-section directional plate (24) is provided on the hydrophilic membrane substrate (8). The guide structure (25) is provided at the section of the three-section directional plate (24) and has a predetermined gap with the three-section directional plate (24). The closure plate (26) is provided on both sides of the three-section directional plate (24) to connect the three-section directional plate (24) and the guide structure (25). The angle between the two folds of the three-section directional plate (24) is in the range of 140°-160°. The included angle between the three-section directional plate (24) and the guide structure (25) is 50°. The gap between the three-section directional plate (24) and the guide structure (25) is 5mm.

2. A discontinuous fiber orientation device based on fluid induction method as claimed in claim 1, wherein, The nozzle main body structure (17) includes a directional front plate (18), a directional middle plate (19), and a directional back plate (20). The directional front plate (18) and the directional back plate (20) are provided with a groove (21) on one side. The directional middle plate (19) is provided with a groove (21) on both sides. The directional front plate (18) and the directional middle plate (19) form a group of internal pipelines. The directional back plate (20) and the directional middle plate (19) form another group of internal pipelines.

3. A discontinuous fiber orientation device based on fluid induction method as claimed in claim 2, wherein, The spray head body structure (17) has thirty-two spray head outlets (23), the diameter of the spray head outlets (23) is 1mm, and the interval between two adjacent spray head outlets (23) is 5mm.

4. A method of orienting discontinuous fibers using the fluid- induced method-based discontinuous fiber orienting apparatus according to any one of claims 1 to 3, characterized by, Comprise: (1) Short discontinuous fiber powder having a length of less than 10 mm is charged into a dry hopper (2), dispersed by a piston vibrator (3), and then dropped into a feed tank (1) containing water having a density of 1 g / cm 3 and a dynamic viscosity of 0.001 Pa-s. (2) The fiber suspension after mixing the discontinuous fiber powder with water is uniformly distributed by the continuous stirring of the impeller (4), and the fiber volume fraction is 0.003%; (3) The fiber suspension is pumped out by the peristaltic pump (13) and flows to the directional spray head (15), the directional spray head (15) is designed with a bifurcated tree structure and double-sided pipeline interlacing, so that the fiber suspension sprayed by the directional spray head (15) falls on the multi-section directional structure (16) in a uniform plane shape; (4) The fiber suspension flows through the sections of the multi-section directional structure (16), the discontinuous fibers are in impact contact with the surface of the multi-section directional structure (16), the fibers are oriented, and then fall on the hydrophilic membrane substrate (8) with a hydrophilic surface; (5) The oriented discontinuous fibers and water are preliminarily separated due to the hydrophilic effect of the hydrophilic membrane substrate (8), the water permeates the hydrophilic membrane and falls into the water seepage tank (7), flows into the water storage tank (10) through the water seepage port (9), the vacuum pump (12) is connected to the water seepage tank (7) through the conduit (14), the upper surface of the water seepage tank (7) is a porous structure, and the other surfaces are closed, the water attached to the discontinuous fibers is further removed by vacuum suction, and at the same time, the suction action causes the discontinuous fibers to be adsorbed on the hydrophilic membrane substrate (8) to realize fixation; (6) With the operation of the synchronous belt (6), the oriented discontinuous fibers are brought into the heat atmosphere generator (11), the inside of the heat atmosphere generator (11) is a high-temperature atmosphere of 100℃, the further drying of the discontinuous fibers is realized, and finally the dry discontinuous short fiber carbon cloth with high orientation angle and uniform fiber density is produced.

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