A short fiber continuous orientation felting device and its use method and application

Abstract

The present invention relates to a short fiber continuous orientation felting device and its use method and application. The device mainly includes a fiber dispersion unit, a fiber orientation unit, a transmission unit, etc. The fiber dispersion unit prepares and stores a fiber suspension, and then sprays it onto the flat plates arranged in parallel from low to high in the fiber orientation unit. During the falling process of the short fibers, the slits between two adjacent flat plates are used to achieve fiber orientation. The wet fiber felt thus obtained is transported by the transmission unit to the spray cleaning process and the drying process, and then wound and packaged. The short fiber continuous orientation felting device provided by the present invention has a relatively simple structure, a high degree of mechanization and automation, and has the advantages of high orientation, high production efficiency, simple and environmentally friendly process, and the ability to continuously felt. It is suitable for various types of fiber materials and is conducive to promoting the healthy and sustainable development of the fiber recycling and reuse industry.

Description

Technical Field

[0001] The present invention relates to the field of fiber orientation and mechanical technology, and in particular to a short fiber continuous orientation felt making device and a use method and application thereof. Background Art

[0002] Fiber-reinforced resin-based composite materials have excellent physical properties such as high specific modulus, high specific strength, low thermal expansion coefficient, corrosion resistance, and high temperature resistance. They are widely used in many fields such as national defense and military industry, aerospace, transportation, wind power generation, medical equipment, and sports equipment. In recent years, the global market demand for fiber materials has maintained steady growth. Taking carbon fiber as an example, in 2020, global carbon fiber demand exceeded 100,000 tons to reach 106,900 tons. It is expected that the carbon fiber market demand will reach 200,000 tons in 2025, with an annual compound growth rate of more than 10%. However, the application life of fiber composite materials in various fields is limited, and the longest does not exceed 30 years. With the increase in the use of fiber materials and the expansion of production capacity, the fiber waste scraps generated in the manufacturing process and the scrapped fiber products at the end of their service life have also increased sharply. Taking carbon fiber as an example, according to statistics, in 2020 alone, the amount of carbon fiber waste scraps and carbon fiber products at the end of their service life reached 62,000 tons.

[0003] Fiber-reinforced resin-based composites are mostly made from thermosetting resins. The molecular chains in these resins are chemically cross-linked to form a rigid three-dimensional network, endowing the material with excellent corrosion resistance, aging resistance, and heat resistance. This irreversible cross-linking makes fiber composites difficult to reprocess, making recycling and reuse difficult. Consequently, for decades, waste fiber products have primarily been disposed of through traditional methods such as landfill and incineration. These methods not only pollute the environment but also significantly waste the economically valuable fiber materials present in the waste, leading to their gradual prohibition. From an economic perspective, recycling waste fiber materials reduces production costs and holds significant commercial value. From an environmental perspective, recycling waste fiber also holds significant practical significance for promoting resource conservation and recycling, as well as the healthy development of the industry.

[0004] At present, the recycling methods of fiber composite materials mainly include mechanical recycling, heat treatment and chemical recycling. The regenerated fibers obtained by these recycling methods are mostly randomly distributed chopped fibers. However, fiber is an anisotropic material, and its axial performance is much stronger than its radial performance. Directly using disordered chopped fibers as composite reinforcement cannot maximize the excellent axial performance of the fiber. The mechanical properties of the recycled composite materials obtained are very different from those of the original composite materials. Therefore, they can only be made into non-load-bearing structural parts or decorative parts through compression molding or injection molding, which greatly limits the application field of recycled fibers. Therefore, optimizing the orientation of recycled fibers is the key to improving the performance of recycled fiber composite materials and expanding their application range, which is of great significance to promoting the sustainable development of composite materials.

[0005] How to achieve the orientation of chopped fibers efficiently and accurately is one of the research focuses in the field of carbon fiber recycling. In recent years, domestic and foreign researchers have also conducted a lot of exploration to solve this problem. The current methods for preparing chopped fiber oriented felts mainly include magnetic field orientation, electric field orientation and wet orientation. Among them, magnetic field orientation is to place the fibers in a strong magnetic field. The short fibers are affected by the magnetic torque force and change their arrangement orientation. Finally, they are consistent with the direction of the magnetic field force to obtain short fiber felt with a certain degree of orientation. The orientation degree of the finished product obtained by this method is low, and it is only suitable for fibers with good magnetic conductivity, so its application range is limited. Electric field orientation is similar to magnetic field orientation. It requires the fibers to be conductive, which limits the types of oriented fibers. In addition, the orientation degree of the regenerated fibers obtained is also low, and the process cost is high.

[0006] Compared with magnetic field and electric field orientation, the regenerated carbon fiber oriented felt prepared by wet orientation has a better orientation degree. Chinese invention patent CN114669229B discloses a short-cut regenerated carbon fiber orientation device. This solution is based on wet orientation technology. The short-cut fiber suspension is extruded onto a continuously heated aluminum block through a tapered orientation nozzle, and the water in the regenerated carbon fiber suspension is evaporated at high temperature to obtain a regenerated carbon fiber oriented felt. This device cannot continuously prepare longer carbon fiber oriented felts according to demand, and can only prepare block-shaped felts according to the area of ​​the aluminum block, and the orientation degree of the felt needs to be improved. Chinese invention patent CN107662353B discloses a method and device for preparing oriented short fiber composite materials. This solution directly orients the fiber and resin into a mixed liquid. The fiber orientation rate in the final product is low, and the application of the product is relatively limited due to direct composite molding. In addition, the structure of the device is also relatively complex. Summary of the Invention

[0007] To address the common issues of existing similar devices, such as complex structure, low fiber orientation, narrow applicability, and inability to achieve continuous large-scale production, the present invention provides a short fiber continuous orientation felting device. The device primarily comprises a fiber dispersion unit and a fiber orientation unit. The fiber dispersion unit is primarily used to form a suspension of short fibers and transport it to the fiber orientation unit. The fiber orientation unit is primarily used to continuously and directionally align the short fibers in the suspension and achieve solid-liquid separation.

[0008] Furthermore, the fiber orientation unit includes at least one flat plate group, each of which consists of several flat plates spaced a certain distance apart and arranged in parallel from low to high. The fiber dispersion unit sprays a fiber suspension onto the unevenly spaced flat plates. The short fibers then adhere to the plate surfaces and gradually slide downward under the influence of the water flow and their own gravity. Constrained by the narrow gaps between adjacent flat plates, these short fibers are forced to align in the direction of the gaps, ultimately producing a wet fiber mat with highly consistent orientation. By varying the number of flat plates within a group or arranging multiple flat plate groups side by side along the transport direction, the thickness and width of the finished short fiber oriented mat can be easily adjusted.

[0009] Furthermore, the spacing between adjacent plates in each plate group is controlled between 0.5mm and 5mm. The spacing between adjacent plates is the width of the slit, which determines the orientation effect and efficiency of the staple fibers: although a slit that is too large improves the passage of staple fibers, it will reduce their orientation. A slit that is too small will cause staple fibers to accumulate in the slit, affecting the normal operation of the equipment. Therefore, the appropriate slit width is very important.

[0010] Furthermore, the fiber dispersion unit includes a suspension container and a drainage tube 9. The inlet of the drainage tube 9 is connected to the suspension container, and the outlet of the drainage tube 9 is directed toward the flat plates of the fiber orientation unit. The suspension container is primarily used to prepare and store the fiber suspension, while the drainage tube 9 is used to drain the fiber suspension to a specific location and spray it onto the various flat plates of the fiber orientation unit at a specific height and angle.

[0011] Furthermore, the suspension container includes a dispersion tank 1 and a storage tank 2, which are connected by a connecting pipe 3. A valve 8 is also provided on the connecting pipe 3. The dispersion tank 1 is mainly used to evenly disperse the short fibers in the solution, and the storage tank 2 is mainly used to temporarily store the fiber suspension. The coordination of the dispersion tank 1 and the storage tank 2 can achieve continuous feeding and continuous production, improving work efficiency while ensuring the continuity of the entire process.

[0012] Furthermore, a stirrer is provided inside the dispersion tank 1 and the storage tank 2. The stirrer type is selected from any one of a spiral type, a hinged turbine type, a frame type, and an anchor type U-shaped propeller. An ultrasonic generator 7 is also provided inside the storage tank 2. The main function of the stirrer is to promote uniform dispersion of the short fibers, and the main function of the ultrasonic generator is to assist in dispersing the short fibers in the suspension and eliminate tiny bubbles in the suspension.

[0013] Furthermore, each drainage pipe 9 has a tapered structure (ie, variable diameter), and the diameter of the feed port is larger than the diameter of the discharge port.

[0014] Furthermore, the drainage tube 9 is connected to a peristaltic pump 16 for pumping the fiber suspension to the fiber orientation unit.

[0015] The device further includes a guide mechanism comprising a guide ring 10 and a guide track 17. The guide ring 10 is fixedly connected to the guide track 17 and can slide linearly along the guide track 17. A row of through holes is vertically arranged on the guide ring 10, and the discharge ends of the drainage tubes 9 are fixed in these through holes, with the discharge direction directed toward the various flat plates of the fiber orientation unit. This design facilitates adjustment of the discharge angle and distance of the drainage tubes 9, which promotes better orientation of the short fibers in the suspension.

[0016] Furthermore, the device also includes a conveying unit, which includes a conveyor belt, a pressure roller 12, and a winder 13. The conveyor belt is located directly below the flat plate group of the fiber orientation unit and is used to receive and convey the oriented fiber mat. Multiple sets of pressure rollers 12 are also located at different positions above the conveyor belt to even out or compact the oriented fiber mat. The winder 13 is located at the end of the conveyor belt and is used to continuously collect the oriented fiber mat.

[0017] Furthermore, holes are provided on the conveyor belt for separating and discharging moisture from the fiber suspension; a negative pressure suction box 14 is also provided under the conveyor belt, which is used to collect moisture from the suspension on the one hand, and to preliminarily remove moisture from the oriented fiber mat and arrange the fibers tightly on the other hand; the moisture collected by the negative pressure suction box 14 is transported to the fiber dispersion unit for reuse.

[0018] The apparatus further includes a water mist spray device 13 and a drying device, both of which are located above the conveyor belt and installed between the flat plate assembly of the fiber orientation unit and the winder 13 of the conveyor unit. The water mist spray device 13 primarily washes away residual dispersant from the oriented fibers, while the drying device primarily dries the wet oriented fiber mat.

[0019] Furthermore, the device also includes a main body operation control box 20, which is connected to each unit through cables and controls the operation status thereof.

[0020] The second purpose of the present invention is to provide a method for using the above-mentioned short fiber continuous orientation felting device, which includes the following steps: starting the entire device, adding short fibers, solvents (such as water), dispersants (not necessary, can be added as needed) and the like into the dispersion tank 1 and mixing them evenly to form a suspension; the suspension passes through the storage tank 2 and is pumped by the drainage pipe 9 and sprayed onto the flat plate of the fiber orientation unit, the short fibers pass through the slit between the two adjacent flat plates to complete orientation and fall onto the conveyor belt, and are packaged and rolled after rolling, spray washing, and drying.

[0021] Furthermore, the short fibers are selected from at least one of carbon fibers, glass fibers, polyimide fibers, aramid fibers, nylon fibers, natural fibers or other chemical fibers, and the length of the short fibers is 3 mm to 40 mm.

[0022] The third object of the present invention is to provide the application of the above-mentioned short fiber continuous orientation felt making device or its use method in recycling various fiber materials.

[0023] Compared with existing similar technologies, the advantages of the present invention are as follows:

[0024] 1) The present invention uses a unique short-cut fiber orientation method to continuously prepare a fiber mat with a high degree of orientation. Compared with the existing wet orientation technology, the fiber arrangement direction in the present invention is greatly affected by the slit of the orientation parallel plate. The oriented fiber mat obtained by this method has a high degree of orientation, and the smaller the parallel plate slit, the higher the fiber orientation degree.

[0025] 2) The existing technology completely relies on the tapered flow channel to achieve fiber orientation, which is not only prone to clogging but also has low production efficiency and is not conducive to large-scale industrial production.

[0026] 3) The devices used for short fiber orientation in the prior art usually have complex structures and high processing costs, especially the fiber orientation units. The device structure provided by the present invention is very simple, especially the fiber orientation unit is composed of only multiple smooth metal, glass or plastic flat plates, which is not only convenient to process but also has a very low manufacturing cost.

[0027] 4) The short fiber continuous oriented felt making device provided by the present invention includes a fiber dispersion unit, a fiber orientation unit, a drying unit and a winding unit. The various units are connected by a porous conveyor belt. The entire process from fiber dispersion to oriented fiber felt winding is very coherent and smooth, with a high degree of mechanization, and can continuously prepare fiber oriented felts of 100 meters in length.

[0028] 5) The fiber dispersion and storage of the present invention are carried out in two containers, a dispersion tank and a storage tank, respectively. When the storage tank cooperates with the orientation unit to transport the chopped fiber suspension, the dispersion tank can simultaneously continue the next round of fiber dispersion process to replenish the consumption of the fiber suspension in the storage tank, thereby effectively improving work efficiency and ensuring the consistency of the overall process and flow.

[0029] 6) The fiber dispersion medium in the present invention is water, which is green and environmentally friendly, and multiple groups of negative pressure suction boxes are arranged under the porous conveyor belt, which can recycle and reuse excess water in the orientation process, thereby avoiding waste of resources.

[0030] 7) The short fiber orientation felting method provided by the present invention does not have high requirements on the type and length of the short fibers, and is generally applicable to various fibers with a length of 3mm-40mm, including carbon fiber, glass fiber, polyimide fiber, aramid fiber, nylon fiber, natural fiber and various other chemical fibers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the short fiber continuous orientation felt making device of the present invention.

[0032] Figure 2 Schematic diagram of the structure of the fiber orientation unit of the present invention.

[0033] Figure 3 The following are the actual objects and micrographs of the 8mm short fiber oriented felt prepared.

[0034] Among them, 1-dispersion tank; 2-storage tank; 3-connecting pipe; 4-bracket; 5-disperser; 6-storage stirrer; 7-ultrasonic generator; 8-valve; 9-drainage pipe; 10-guide ring; 11-orientation parallel plate; 12-pressure roller; 13-water mist spray device; 14-negative pressure suction box; 15-porous conveyor belt; 16-peristaltic pump; 17-guide rail; 18-main operation control box; 19-blast oven; 20-winding machine. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to fully understand the technical solutions and beneficial effects of the present invention, further description will be given below in conjunction with specific embodiments and drawings.

[0036] like Figure 1-2 The illustrated apparatus for continuously oriented staple fiber felting primarily comprises a fiber dispersion unit, a fiber orientation unit, a conveyor unit, a spray unit, a drying unit, and a main operation control box 18. These functional units are arranged nearly in a straight line. The main operation control box 18 serves as the master switch and control center for the entire apparatus. It connects to and controls various electrical devices in the other units, such as agitators, pumps, electromagnetic switches or valves, ultrasonic generators, and power motors.

[0037] The fiber dispersion unit includes a dispersion tank 1, a storage tank 2, a connecting pipe 3, and a bracket 4. The dispersion tank 1 is fixed on the bracket 4 so that its discharge port is higher than the feed port of the storage tank 2, ensuring that the fiber suspension in the dispersion tank 1 can spontaneously flow to the storage tank 2 under the action of gravity. The dispersion tank 1 and the storage tank 2 are connected by a connecting pipe 3 (with a diameter of about 30-60 mm), and a valve 8 is provided in the middle of the connecting pipe 3. A dispersing agitator 5 is provided in the dispersion tank 1, and a storage agitator 6 and several groups of ultrasonic generators 7 are provided in the storage tank 2. These agitators and ultrasonic generators can ensure uniform dispersion of the short fibers. The structures of the dispersing agitator 5 and the storage agitator 6 are different. The former is selected from a spiral or folding blade turbine agitator, and the speed is controlled within the range of 200-1200 r / min and can be adjusted arbitrarily; the latter is selected from a frame or anchor U-shaped paddle agitator, and the speed is controlled within the range of 50-600 r / min and can be adjusted arbitrarily. The ultrasonic frequency generated by the ultrasonic generator 7 is within the range of 20-50 kHz and can be adjusted arbitrarily. The dispersion tank 1 and the storage tank 2 are both made of metal, and the volumes of the two are 50-300L and 100-600L respectively. This capacity combination is also conducive to continuous production.

[0038] The fiber orientation unit includes a drainage tube 9, a guide ring 10, an orientation parallel plate 11, and a guide track 17. The drainage tube 9 is connected to the discharge port of the storage tank 2 via a main pipe, a peristaltic pump 16, and several branch pipes. A nozzle is provided at the end of each branch pipe of the drainage tube 9. The drainage tube 9 has a tapered outlet with an outlet diameter of 1-6 mm. The diameter of the drainage tube at the feed port at the bottom of the storage tank is 10-60 mm. Driven by the peristaltic pump 16, the fiber suspension in the storage tank 2 flows through the drainage tube 9 at a flow rate of 0.2-5 m / s and is sprayed onto the smooth surface of the orientation parallel plate 11. The oriented parallel plates 11 and guide rails 17 are fixed to the support frame of the porous conveyor belt 15. The guide ring 10 is fixed to the guide rail 17 via a connecting rod and can slide along it. Several through holes are set vertically and evenly spaced on the guide ring 10. The branch pipes at the end of the drainage tube 9 are fixed to these through holes one by one with screws. After assembly, the nozzle of the drainage tube 9 is facing the oriented parallel plates 11. The oriented parallel plates 11 are not tightly attached to each other, and the heights of the plates are not the same. Figure 2It can be seen that the oriented parallel plate 11 includes several plastic, metal or glass plates of different heights. The width of a single plate is 200-600mm and the thickness is 1-3mm. These plates are arranged in parallel from low to high with an interval of 0.5mm-5mm to form a flat plate group. One group or multiple groups of flat plates can be set at a certain distance in the transmission direction of the porous conveyor belt 15. After the fiber suspension is sprayed from each nozzle to different parallel plates, the short fibers therein are then attached to the plate surface. Under the action of water flow and their own gravity, these short fibers pass through the gap between the two adjacent flat plates and fall horizontally onto the porous conveyor belt 15 below. During the falling process, the short fibers complete their orientation, and finally a wet fiber felt with highly consistent orientation is obtained.

[0039] The conveying unit includes a pressure roller 12, a porous conveyor belt 15, and a winder 20. The flat plate group of the fiber orientation unit is located at the entrance section of the porous conveyor belt 15, and the winder 20 is located at the exit section of the porous conveyor belt 15. The flat plate group and the pressure roller 12 are both located at different positions directly above the porous conveyor belt 15. There are two groups of pressure rollers 12, one group is close to the flat plate group, and the other group is close to the winder 20. The conveying speed of the porous conveyor belt 15 is controlled at 0.3-20m / min, and its material is a stainless steel bar with 100-200 mesh holes on the surface. A water mist spray device 13 and a blast oven 19 are sequentially arranged along the conveying direction between the two pressure rollers 12 directly above the porous conveyor belt 15, which are used for spraying and cleaning the oriented fiber felt and drying it, respectively. The drying temperature is controlled in the range of 100-500℃ and is adjustable. Directly below the porous conveyor belt 15, from the flat plate group to the water mist spray device 13, there are multiple groups of negative pressure suction boxes 14, which are used to recover the moisture in the fiber suspension and reuse it, and also help to align the oriented fiber mat tightly (suction and compaction).

[0040] The operation process and operation principle of the entire device are as follows:

[0041] (1) First, power on and start the main operation control box 18. After checking that all equipment is normal, normal production can begin.

[0042] (2) Fiber dispersion: Place the chopped fibers into the dispersion tank 1, add an appropriate amount of water as the dispersion medium, and turn on the power of the disperser 5 to run it at a lower speed. After about 5 minutes, add an appropriate amount of dispersant to the dispersion tank 1, continue to stir slowly for 2 minutes, and then increase the speed. After 30-50 minutes, turn off the power of the disperser 5, open the valve 8 of the connecting pipe 3, and transport the dispersed fiber suspension to the storage tank 2 under the action of gravity. At the same time, turn on the switches of the storage stirrer 6 and the ultrasonic generator 7. After the feeding is completed, close the valve 8 of the connecting pipe 3, re-add the chopped fibers to continue to prepare the fiber suspension for continuous feeding and production.

[0043] The chopped fibers to be processed can be one or more of carbon fibers, glass fibers, polyimide fibers, aramid fibers, nylon fibers, natural fibers, and various chemical fibers, preferably with a fiber length of 3-40 mm. The dispersant used can be any of hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, and sodium carboxymethyl cellulose. The fiber concentration in the suspension is 1-20 g / L, and the dispersant concentration is 2-8 g / L.

[0044] (3) Fiber orientation: Use the guide device composed of the guide ring 10 and the guide rail 17 to adjust the nozzle at the end of the drainage tube 9 so that the distance (20-200mm) and the angle (30°-90°) between it and the surface of the orientation parallel plate 11 are within the designed range, and fix the drainage tube 9 with screws. Turn on some power switches of the main operation control box 18, and the various supporting equipment start to operate. Turn on the peristaltic pump 16, and adjust the power of the peristaltic pump 16 according to the spray effect of the nozzle of the drainage tube 9. You can also fine-tune the position and angle of the guide ring 10 until each nozzle can accurately spray the fiber suspension onto the corresponding flat plate. Adjust the running speed of the porous conveyor belt 15 according to the required thickness of the oriented fiber mat, and use the porous conveyor belt 15 to transport the wet fiber mat that has completed the orientation forward. During the transportation process, the wet fiber mat is rolled by the pressure roller 12 and then washed by the water mist spray device 13 to remove the dispersant. The water flow rate of the water mist spray device 13 should not be too large to avoid affecting the overall orientation of the fiber mat. At the same time, the negative pressure suction box 14 below the porous conveyor belt 15 continues to operate, recovering excess water and dispersant and transporting them to the dispersion tank 1 for reuse.

[0045] (4) Fiber Drying: The wet fiber mat is conveyed by a porous conveyor belt 15 into a blast oven 19, and the oven temperature is set at 100-500°C. If the resulting fiber mat is not dry enough, the oven temperature can be adjusted or the conveyor belt speed can be reduced to achieve a better drying effect.

[0046] (5) Fiber winding: The dried oriented fiber mat is pressed and flattened for the second time by the pressing roller 12, and then sent to the winder 20 along the porous conveyor belt 15 for winding. The continuous short-cut fiber oriented mat is prepared.

[0047] Figure 3 The following is a photo of the finished product of oriented fiber mat made of 8mm short fibers using the device of the present invention. Observation under a microscope shows that most of the fibers are arranged in the same direction, with a high degree of orientation and a good orientation effect.

[0048] In summary, the device and method provided by the present invention can rearrange the orientation of various types of recycled chopped fibers, which has the advantages of high orientation, high efficiency, simple and environmentally friendly process, and continuous felting. It provides a new idea and method for solving the problem that recycled fibers are difficult to fully and efficiently utilize due to their messy arrangement, and is conducive to promoting the healthy and sustainable development of the fiber recycling and reuse industry.

Claims

1. A short fiber continuous orientation felting device, characterized in that: The device mainly includes a fiber dispersion unit and a fiber orientation unit. The fiber orientation unit includes at least one flat plate group, each of which includes several flat plates spaced a certain distance apart and arranged in parallel from low to high. The fiber suspension in the fiber dispersion unit is sprayed onto the flat plate, and the short fibers pass through the slit between two adjacent flat plates during the falling process to complete the orientation.

2. The device according to claim 1, wherein: The distance between two adjacent flat plates in the same flat plate group is 0.5 mm to 5 mm.

3. The device according to claim 1, wherein: The fiber dispersion unit comprises a suspension container and a drainage pipe (9), wherein the feed port of the drainage pipe (9) is connected to the suspension container, and the discharge port of the drainage pipe (9) faces the flat plate of the fiber orientation unit.

4. The device according to claim 3, wherein: The suspension container comprises a dispersion tank (1) and a storage tank (2) connected in series, wherein a stirrer is provided inside the dispersion tank (1) and the storage tank (2), and an ultrasonic generator (7) is also provided inside the storage tank (2).

5. The device according to claim 3, wherein: The device further comprises a guide ring (10) and a guide track (17), wherein the guide ring (10) is fixedly connected to the guide track (17) and slides linearly therewith, and the discharge port ends of the drainage tube (9) are respectively fixed in through holes arranged in the vertical direction on the guide ring (10).

6. The device according to claim 1, wherein: The device also includes a conveying unit, which includes a conveyor belt, a pressure roller (12), and a winder, wherein the conveyor belt is arranged directly below the fiber orientation unit, the pressure roller (12) is arranged above the conveyor belt and presses it, and the winder is arranged at the end of the conveyor belt.

7. The device according to claim 6, characterized in that: The device further comprises a water mist spraying device (13), a drying device, a negative pressure suction box (14), and a main body operation control box. The water mist spraying device (13) and the drying device are both located above the conveyor belt, the negative pressure suction box (14) is located below the conveyor belt, and the main body operation control box is connected to each unit and controls its operating status.

8. The method for using the short fiber continuous orientation felting device according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: starting the entire device, using a dispersion tank (1) to prepare short fibers into a fiber suspension; the fiber suspension passes through a storage tank (2) and is pumped by a drainage pipe (9) and sprayed onto a flat plate; the short fibers pass through a slit between two adjacent flat plates to complete orientation and fall onto a conveyor belt; and are rolled, spray-washed, dried, and then packaged and rolled.

9. The method according to claim 8, wherein: The short fibers are selected from at least one of carbon fibers, glass fibers, polyimide fibers, aramid fibers, nylon fibers, natural fibers or other chemical fibers, and the length of the short fibers is 3 mm to 40 mm.

10. Use of the short fiber continuous orientation felt-making device according to any one of claims 1 to 7 in recycling fiber materials.

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