A dust recovery device for the production process of bundled chopped carbon fiber
By using dust separation tanks, carbon fiber separation wire mesh and separation milling cylinders during the carbon fiber production process, the problem of difficult separation and recovery of carbon fiber dust in traditional dust recovery devices is solved, and efficient recycling and reuse of carbon fiber dust is achieved to ensure that Safety and normal operation of the equipment.
Patent Information
- Application Number
- CN202411417844.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2044-10-11
AI Technical Summary
It is difficult for traditional dust recovery devices to effectively separate and recover carbon fiber dust, especially the resin dust generated during the cutting process, which affects the reuse of carbon fiber dust.
A dust recovery device for the production process of bundled chopped carbon fibers is designed, including a dust separation tank, a carbon fiber separation wire mesh, a separation mill and a conical milling cylinder. Large pieces of debris and bonds are bonded through air flow power and shear blades. Dust crushing is used to separate fibers and resin dusts of different sizes by using carbon fiber to achieve effective recycling of carbon fiber powder.
It realizes efficient separation and recycling of carbon fiber dust, avoids dust dissipation, improves the recycling value of carbon fiber, and ensures the safety of equipment and personnel.
Smart Images
Figure CN118904473B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of processing bundled short-cut carbon fibers, and in particular to a dust recovery device used in a production process of bundled short-cut carbon fibers. Background Art
[0002] Carbon fiber reinforced composite materials are widely used in aerospace, automotive, construction, sports and entertainment products due to their light weight and high strength. However, during the production process of carbon fiber, especially during the cutting stage, a large amount of carbon fiber dust will be generated. This dust will float in the air or adhere to equipment and operators, causing great harm to electrical equipment and human health. Therefore, the dust needs to be recycled.
[0003] However, conventional dust recovery and processing devices, such as the high-temperature silicon-containing dust cleaning device after incineration of carbon fiber waste gas with publication number CN114832564A, only discharge the carbon fiber dust when processing and recovering carbon fiber dust, but it is difficult to recycle it. Moreover, when cutting carbon fiber, not only carbon fiber dust but also some resin dust will appear, which is difficult to effectively separate, thus affecting the recovery and reuse of carbon fiber dust. Summary of the invention
[0004] The purpose of the present invention is to provide a dust recovery device for use in the production process of bundled chopped carbon fibers, so as to solve the problem raised in the above background technology that the current conventional dust recovery and treatment devices are difficult to reuse carbon fiber dust.
[0005] To achieve the above object, the present invention provides the following technical solution: a dust recovery device for a production process of bundled chopped carbon fiber, comprising a dust separation tank, a driving motor is arranged at one end of the dust separation tank, a centrifugal impeller is fixedly connected to the main shaft of the driving motor, a conical partition is arranged on the outer side of the centrifugal impeller, an air outlet is opened on one side of the centrifugal impeller, and a sizing agent powder discharge hose is connected to the air outlet;
[0006] A carbon fiber separation steel wire mesh is arranged outside the air inlet of the conical partition, an anti-clogging scraper is arranged outside the carbon fiber separation steel wire mesh, and the anti-clogging scraper is fixedly mounted on the main shaft of the driving motor, and a carbon fiber falling chute is arranged below the dust separation tank;
[0007] The right side of the dust separation tank is connected to a pretreatment box through a connecting hose, one end of the pretreatment box is connected to a carbon fiber powder suction hose, a separation grinding cylinder is arranged in the pretreatment box, one end of the separation grinding cylinder is provided with a powder inlet, and the other end of the separation grinding cylinder is provided with a powder outlet, the powder inlet is fixedly connected to the carbon fiber powder suction hose, and the powder outlet is fixedly connected to the connecting hose;
[0008] A cylindrical grinding cylinder is arranged inside the separation grinding cylinder, a conical grinding cylinder is also arranged inside the cylindrical grinding cylinder, and the conical grinding cylinder is connected with a pneumatic fan blade through a transmission shaft, and the pneumatic fan blade is located at the end of the separation grinding cylinder.
[0009] Furthermore, the conical partition divides the dust separation tank into two sections, an air inlet is provided at the center of the conical partition, the conical partition itself has a conical cross-section, expands outwardly in a trumpet shape, and the air inlet faces the center of the centrifugal impeller.
[0010] Furthermore, the mesh diameter of the carbon fiber separation steel wire mesh is 0.2 mm.
[0011] Furthermore, the anti-clogging scraper is provided with three pieces in total, and the angle between them is 120 degrees, and the anti-clogging scraper is closely attached to the carbon fiber separation steel wire mesh.
[0012] Furthermore, the carbon fiber drop chute is located outside the carbon fiber separation wire mesh, the carbon fiber drop chute is below the anti-clogging scraper, a removable carbon fiber collecting box is provided at the bottom of the carbon fiber drop chute, and silicone sealing rings are provided around the fiber collecting box where it contacts the carbon fiber drop chute.
[0013] Furthermore, the connecting hose, the separation grinding cylinder and the carbon fiber powder suction hose are arranged in two or more groups, and the ends of the carbon fiber powder suction hose are close to the cutting processing part of the carbon fiber cutting machine from two or more directions.
[0014] Furthermore, the tip of the conical grinding cylinder faces the powder inlet, the tail end of the conical grinding cylinder faces the powder outlet, the tip of the conical grinding cylinder is closed, the tail end of the conical grinding cylinder is open, the conical grinding cylinder is surrounded by dense second dust passing holes, and the outer wall of the conical grinding cylinder is processed with a shearing edge.
[0015] Furthermore, first dust passing holes are densely opened around the cylindrical grinding cylinder, and a gap is left between the cylindrical grinding cylinder and the inner wall of the separation grinding cylinder.
[0016] Furthermore, the spiral direction of the shearing blade is opposite to the rotation direction of the pneumatic fan blade.
[0017] Furthermore, the conical grinding cylinder is made of metal, and the gap between the conical grinding cylinder and the inner wall of the cylindrical grinding cylinder is 1 mm.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] 1. The present invention discloses a dust recovery device for use in the production process of bundled chopped carbon fibers. By setting a separation grinding cylinder, the power of the airflow is used to drive the conical grinding cylinder to rotate, and then the conical grinding cylinder and the cylindrical grinding cylinder are matched to crush large pieces of debris and dust debris stuck together, so as to facilitate subsequent separation work.
[0020] 2. The present invention provides a dust recovery device for use in the production process of bundled chopped carbon fibers. By setting up a dust separation tank, a carbon fiber separation wire mesh is used to separate short fibers with a size of more than 2 mm that have recycling value from carbon fiber dust with a size of less than 2 mm that is mixed with resin, thereby obtaining carbon fiber powder that is easy to recycle and has economic value. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The structure of the present invention is shown in FIG. Figure 1 ;
[0022] Figure 2 The structure of the present invention is shown in FIG. Figure 2 ;
[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the dust separation tank of the present invention;
[0024] Figure 4 This is a schematic diagram of the centrifugal impeller structure of the present invention;
[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the conical partition of the present invention;
[0026] Figure 6 This is a schematic diagram of the anti-clogging scraper structure of the present invention;
[0027] Figure 7 This is a schematic diagram of the structure of the separation grinding cylinder of the present invention;
[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the separation grinding cylinder of the present invention;
[0029] Fig. 9 This is a schematic diagram of the cross-sectional structure of the cylindrical grinding drum of the present invention;
[0030] Fig.10 It is a schematic diagram of the cross-sectional structure of the conical grinding cylinder of the present invention.
[0031] Numbers in the figure: 1. Dust separation tank; 2. Driving motor; 3. Centrifugal impeller; 4. Conical partition; 401. Air inlet; 5. Air outlet; 6. Sizing agent powder discharge hose; 7. Carbon fiber separation wire mesh; 8. Anti-clogging scraper; 9. Carbon fiber drop chute; 10. Carbon fiber collection box; 11. Connecting hose; 12. Pretreatment box; 13. Separation grinding cylinder; 1301. Powder inlet; 1302. Powder outlet; 14. Carbon fiber powder suction hose; 15. Cylindrical grinding cylinder; 16. Conical grinding cylinder; 1601. Second dust through hole; 1602. Shear blade; 17. Pneumatic fan blade. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.
[0034] Combination Figure 1 - Fig.10 A dust recovery device for a production process of bundled chopped carbon fiber comprises a dust separation tank 1, a driving motor 2 is arranged at one end of the dust separation tank 1, a centrifugal impeller 3 is fixedly connected to the main shaft of the driving motor 2, a conical partition plate 4 is arranged on the outer side of the centrifugal impeller 3, an air outlet 5 is arranged on one side of the centrifugal impeller 3, a sizing agent powder discharge hose 6 is connected to the air outlet 5, the conical partition plate 4 divides the dust separation tank 1 into two sections, an air inlet 401 is arranged at the center of the conical partition plate 4, the cross section of the conical partition plate 4 itself is conical, and expands outward in a trumpet shape, and the air inlet 401 faces the center of the centrifugal impeller 3. When the centrifugal impeller 3 rotates, its blades will do work on the air fluid between the blades, causing the air fluid to generate centrifugal force, sucking air from the air inlet 401 and ejecting it from the center of the impeller to the periphery. This centrifugal force allows the air fluid to gain energy, increase static pressure, and increase flow rate. When the air fluid leaves the centrifugal impeller 3 and enters the dust separation tank 1, due to the design of the dust separation tank 1, the fluid will slow down in the flow channel and further increase pressure, and finally be discharged through the air outlet 5.
[0035] like Figure 5 and Figure 6As shown, a carbon fiber separation steel wire mesh 7 is arranged on the outside of the air inlet 401 of the conical partition 4. Due to the fiber characteristics of carbon fiber, the size of carbon fiber debris produced by the cutting process is usually short fibers below 0.5 mm. The mechanical properties of powdered carbon fiber cannot reach the level of continuous carbon fiber composite materials, and the finer the particle size, the worse the mechanical properties. At the same time, carbon fiber with too fine particle size is easily mixed with epoxy resin powder produced by cutting bundled short carbon fiber sizing materials, which is difficult to effectively separate and has a low recycling value. Therefore, the mesh diameter of the carbon fiber separation steel wire mesh 7 is set to 0.2 mm. Short fibers and epoxy resin powder with a size less than 0.2 mm can pass through the carbon fiber separation steel wire mesh 7, while short fibers with a size greater than 0.2 mm will be intercepted by the carbon fiber separation steel wire mesh 7 for centralized recycling to create additional economic value.
[0036] An anti-clogging scraper 8 is arranged on the outside of the carbon fiber separation wire mesh 7. There are three anti-clogging scrapers 8 in total, and the angle between them is 120 degrees. The anti-clogging scraper 8 is fixedly installed on the main shaft of the driving motor 2 together with the centrifugal impeller 3. The anti-clogging scraper 8 and the carbon fiber separation wire mesh 7 are closely attached to each other, so that when the driving motor 2 drives the centrifugal impeller 3 to rotate, it can also drive the anti-clogging scraper 8 to rotate, and scrape off the short fibers adsorbed on the carbon fiber separation wire mesh 7 to prevent the carbon fiber separation wire mesh 7 from being blocked, causing poor airflow and affecting the efficiency of dust recovery. A carbon fiber drop chute 9 is arranged below the dust separation tank 1. The carbon fiber drop chute 9 is located outside the carbon fiber separation steel wire mesh 7. At the same time, the carbon fiber drop chute 9 is below the anti-clogging scraper 8. In this way, when the anti-clogging scraper 8 scrapes off the short fibers adsorbed on the carbon fiber separation steel wire mesh 7, the short fibers will fall into the carbon fiber drop chute 9. In addition, a removable carbon fiber collecting box 10 is arranged at the bottom of the carbon fiber drop chute 9. After the carbon fiber collecting box 10 is full of carbon fiber, it can be drawn out for cleaning. At the same time, a silicone sealing ring is arranged around the carbon fiber collecting box 10 where it contacts the carbon fiber drop chute 9. In this way, when the centrifugal impeller 3 starts to exhaust air, the pressure in the carbon fiber drop chute 9 is reduced, and the external atmospheric pressure will compress the carbon fiber collecting box 10. The silicone sealing ring is used for sealing to ensure air tightness and prevent the carbon fiber collecting box 10 from abnormally falling out during operation. It can also avoid air leakage to ensure the suction effect of the equipment on the carbon fiber powder.
[0037] like Figure 1 , Figure 2 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the right side of the dust separation tank 1 is connected to a pretreatment box 12 through a connecting hose 11, one end of the pretreatment box 12 is connected to a carbon fiber powder suction hose 14, a separation grinding cylinder 13 is arranged in the pretreatment box 12, one end of the separation grinding cylinder 13 is arranged with a powder inlet 1301, and the other end of the separation grinding cylinder 13 is arranged with a powder outlet 1302, the powder inlet 1301 is fixedly connected to the carbon fiber powder suction hose 14, and the powder outlet 1302 is fixedly connected to the connecting hose 11, and the connecting hose 11, the separation grinding cylinder 13 and the carbon fiber powder suction hose 14 are arranged in two or more groups, and the end of the carbon fiber powder suction hose 14 approaches the cutting processing place of the carbon fiber cutting machine from multiple directions, so that the carbon fiber powder can be collected more efficiently. The fine carbon fiber powder is conductive, and if it falls into the motor or electronic equipment, it is easy to cause a short circuit. The multiple air intake and dust suction ends designed in this scheme can prevent some carbon fiber powder from escaping into the workshop air.
[0038] The separation grinding cylinder 13 is provided with a cylindrical grinding cylinder 15, and a conical grinding cylinder 16 is further provided in the cylindrical grinding cylinder 15. The tip of the conical grinding cylinder 16 faces the powder inlet 1301, and the tail end of the conical grinding cylinder 16 faces the powder outlet 1302. The tip of the conical grinding cylinder 16 is closed, and the tail end of the conical grinding cylinder 16 is open. The cylindrical grinding cylinder 15 is densely provided with first dust passing holes around it. There is a gap between the cylindrical grinding cylinder 15 and the inner wall of the separation grinding cylinder 13 for air and dust to pass through. The conical grinding cylinder 16 There are also dense second dust passing holes 1601 around the periphery. There is a gap of 1 mm between the outer wall of the conical grinding cylinder 16 and the inner wall of the cylindrical grinding cylinder 15. The outer wall of the conical grinding cylinder 16 is processed with a shearing blade 1602. The conical grinding cylinder 16 is connected to the pneumatic fan blade 17 through a transmission shaft. The pneumatic fan blade 17 is located at the end of the separation grinding cylinder 13. Therefore, when the air flows in the separation grinding cylinder 13, it must pass through the pneumatic fan blade 17, and then the pneumatic fan blade 17 is driven to rotate by the airflow power, and the pneumatic fan blade 17 then drives the conical grinding cylinder 1 6. Since the spiral direction of the shear blade 1602 is opposite to the rotation direction of the pneumatic fan blade 17, when the conical grinding cylinder 16 rotates, the shear blade 1602 will transfer the carbon fiber and epoxy resin chips to the right, and because the conical grinding cylinder 16 is conical, the gap between the conical grinding cylinder 16 and the cylindrical grinding cylinder 15 is gradually reduced, so that the shear blade 1602 cooperates with the inner wall of the cylindrical grinding cylinder 15 to gradually cut and crush the carbon fiber chips or epoxy resin that are bonded together, so that the epoxy resin and carbon fiber chips are fully The carbon fiber fragments and epoxy resin powder after separation and cutting and crushing will enter into the gap between the cylindrical grinding cylinder 15 and the inner wall of the separation grinding cylinder 13 through the through hole on the cylindrical grinding cylinder 15, and then enter into the connecting hose 11 from the right end of the separation grinding cylinder 13; the other part of the carbon fiber fragments and epoxy resin powder will enter into the conical grinding cylinder 16 through the second dust through hole 1601 on the conical grinding cylinder 16, and then enter into the separation grinding cylinder 13 through the opening at the right end of the conical grinding cylinder 16, and then enter into the connecting hose 11.
[0039] Specifically, since the conical grinding drum 16 is made of metal, it has a certain inertia when rotating, and the debris dust generated by cutting carbon fiber is usually small in size, and the short fibers and broken epoxy resin particles are relatively fragile and can be easily broken. Therefore, when encountering larger debris, the rotational inertia of the conical grinding drum 16 itself is sufficient to crush it, and it is not easy to get stuck.
[0040] Working principle: First, align the ends of two or more groups of carbon fiber powder suction hoses 14 with the cutting position of the carbon fiber cutting machine and fix them. Different carbon fiber powder suction hoses 14 should face different directions. For example, when there are two groups of carbon fiber powder suction hoses 14, place the pipe openings of the two carbon fiber powder suction hoses 14 on the left and right or on the top and bottom. This can maximize the suction of all debris powder and prevent the carbon fiber powder from escaping and causing short circuit failures in electronic equipment.
[0041] Then start the drive motor 2, which will drive the centrifugal impeller 3 to rotate, and extract the short fibers produced by cutting through the carbon fiber powder suction hose 14. At the same time, the sizing agent or bundling agent that makes the carbon fiber bundle will also produce powder and debris during cutting. Generally, epoxy resin is used. The short fibers and resin powder produced by cutting may be mixed together to form lumps, which is not conducive to subsequent recycling. Therefore, when the short fibers and resin powder enter the separation grinding cylinder 13, the air flow will drive the pneumatic fan blades 17 to rotate, and then drive the conical grinding cylinder 16 to rotate. The short fibers and resin powder will enter the gap between the conical grinding cylinder 16 and the cylindrical grinding cylinder 15 under the push of the air flow, and are pushed by the spiral shear blade 1602. The conical grinding cylinder 16 and the cylindrical grinding cylinder 15 gradually move backward, so that the gap between the conical grinding cylinder 16 and the cylindrical grinding cylinder 15 gradually decreases, so that the short fibers and the resin powder are squeezed and rubbed against each other, and then the large pieces of debris and the agglomerated debris are crushed and dispersed. The crushed short fibers and resin powder will pass through the through holes on the cylindrical grinding cylinder 15 into the gap between the cylindrical grinding cylinder 15 and the inner wall of the separation grinding cylinder 13, and then enter the connecting hose 11 from the right end of the separation grinding cylinder 13. Another part of the carbon fiber debris and epoxy resin powder will enter the interior of the conical grinding cylinder 16 through the second dust through hole 1601 on the conical grinding cylinder 16, and then enter the separation grinding cylinder 13 through the opening at the right end of the conical grinding cylinder 16, and then enter the connecting hose 11.
[0042] Then the mixed short fibers and resin powder will enter the dust separation tank 1 together through the connecting hose 11, and the carbon fiber dust with a diameter less than 0.2 mm and the finer resin powder will pass through the small holes on the carbon fiber separation wire mesh 7, enter the centrifugal impeller 3 through the air inlet 401 of the conical partition 4, and then be discharged from the air outlet 5, and collected and discharged through the sizing agent powder discharge hose 6.
[0043] Short fibers with a diameter greater than 0.2 mm are the main recycling target and will be intercepted by the carbon fiber separation wire mesh 7. At the same time, when the driving motor 2 rotates, the anti-clogging scraper 8 will also be driven to rotate to scrape off the adsorbed carbon fiber on the carbon fiber separation wire mesh 7 to prevent the mesh from being blocked. The hanging short fibers will fall into the carbon fiber falling trough 9 and be stored in the carbon fiber collection box 10. The carbon fiber collection box 10 can be pulled out to process the stored carbon fiber.
[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A dust recovery device for use in a production process of chopped carbon fibers, comprising a dust separation tank (1), characterized in that: A driving motor (2) is provided at one end of the dust separation tank (1); a centrifugal impeller (3) is fixedly connected to the main shaft of the driving motor (2); a conical partition plate (4) is provided on the outer side of the centrifugal impeller (3); an air outlet (5) is provided on one side of the centrifugal impeller (3); and a sizing agent powder discharge hose (6) is connected to the air outlet (5); A carbon fiber separation steel wire mesh (7) is arranged outside the air inlet (401) of the conical partition plate (4), an anti-clogging scraper (8) is arranged outside the carbon fiber separation steel wire mesh (7), and the anti-clogging scraper (8) is fixedly mounted on the main shaft of the drive motor (2), and a carbon fiber drop chute (9) is arranged below the dust separation tank (1); The right side of the dust separation tank (1) is connected to a pretreatment box (12) via a connecting hose (11); one end of the pretreatment box (12) is connected to a carbon fiber powder suction hose (14); a separation grinding cylinder (13) is arranged in the pretreatment box (12); one end of the separation grinding cylinder (13) is provided with a powder inlet (1301); the other end of the separation grinding cylinder (13) is provided with a powder outlet (1302); the powder inlet (1301) is fixedly connected to the carbon fiber powder suction hose (14); and the powder outlet (1302) is fixedly connected to the connecting hose (11); A cylindrical grinding cylinder (15) is arranged inside the separation grinding cylinder (13), and first dust passage holes are densely formed around the cylindrical grinding cylinder (15). A gap is left between the cylindrical grinding cylinder (15) and the inner wall of the separation grinding cylinder (13). A conical grinding cylinder (16) is also arranged inside the cylindrical grinding cylinder (15), and the tip of the conical grinding cylinder (16) faces the powder inlet (1301), and the tail end of the conical grinding cylinder (16) faces the powder outlet (1301). In the direction of the outlet (1302), the tip of the conical grinding cylinder (16) is closed, the tail end of the conical grinding cylinder (16) is open, the conical grinding cylinder (16) is provided with dense second dust passage holes (1601) around it, and the outer wall of the conical grinding cylinder (16) is processed with a shearing blade (1602), and the conical grinding cylinder (16) is connected to a pneumatic fan blade (17) via a transmission shaft, and the pneumatic fan blade (17) is located at the end of the separation grinding cylinder (13).
2. A dust recovery device for use in a production process of bundled chopped carbon fibers according to claim 1, characterized in that: The conical partition (4) divides the dust separation tank (1) into two sections, and an air inlet (401) is provided at the center of the conical partition (4). The conical partition (4) itself has a conical cross-section that expands outwards into a trumpet shape, and the air inlet (401) faces the center of the centrifugal impeller (3).
3. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The mesh diameter of the carbon fiber separation steel wire mesh (7) is 0.2 mm.
4. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The anti-clogging scraper (8) is provided in three pieces in total, and the angle between them is 120 degrees. The anti-clogging scraper (8) and the carbon fiber separation steel wire mesh (7) are closely attached to each other.
5. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The carbon fiber drop chute (9) is located outside the carbon fiber separation steel wire mesh (7), and the carbon fiber drop chute (9) is below the anti-clogging scraper (8). A removable carbon fiber collection box (10) is provided at the bottom of the carbon fiber drop chute (9), and a silicone sealing ring is provided around the fiber collection box (10) at the place where it contacts the carbon fiber drop chute (9).
6. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The connecting hose (11), the separation grinding cylinder (13) and the carbon fiber powder suction hose (14) are provided in more than two groups, and the ends of the carbon fiber powder suction hose (14) are close to the cutting processing position of the carbon fiber cutting machine from more than two directions.
7. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The spiral direction of the shearing blade (1602) is opposite to the rotation direction of the pneumatic fan blade (17).
8. The dust recovery device for use in the production process of bundled chopped carbon fibers according to claim 1, characterized in that: The conical grinding cylinder (16) is made of metal, and the gap between the conical grinding cylinder (16) and the inner wall of the cylindrical grinding cylinder (15) is 1 mm.