Spreading device for the production of low-resin-content ultra-thin carbon fiber prepreg

Abstract

This invention relates to the field of composite material manufacturing technology, specifically to a yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg. The device includes a yarn-spreading support and several adjusting frames mounted on its top. Spreading rollers are arranged between the adjusting frames. Each spreading roller includes a central rod, a set of limiting sleeves, and an outer cylinder. The outer cylinder has several evenly distributed oblique holes on its surface. Several partition plates are evenly fixed inside the outer cylinder, dividing its interior into an air-blowing zone, a self-cleaning zone, and a waiting-to-work zone. A double-layer plate is arranged inside the air-blowing zone. The inner plate of the double-layer plate has several first air outlets, and the outer plate has several second air outlets. This invention, by using oblique holes for air-blowing and a double-layer plate structure on the outer cylinder, creates a stable and controllable airflow environment, achieving non-contact, uniform spreading of carbon fiber yarn while reducing mechanical wear.

Description

Technical Field

[0001] This invention relates to the field of composite material manufacturing technology, specifically to a yarn spreading device for producing low-resin-content ultrathin carbon fiber prepreg. Background Technology

[0002] Ultra-thin carbon fiber is an advanced material composed of carbon fiber as the core reinforcement, combined with resin matrix and functional additives. In aerospace, high-end sports equipment and other fields, the demand for lightweight and high-performance materials is increasing. Low-resin-content ultra-thin carbon fiber prepreg has become an ideal material due to its advantages such as high strength and low density. Carbon fiber with high strength and high modulus has undergone strict quality testing and has excellent mechanical properties. By accurately proportioning and specially modifying various resin components, a special low-viscosity resin is obtained. This resin system can still exhibit good impregnation performance even at low content, ensuring that the resin can fully penetrate into every gap of the carbon fiber and achieve a uniform impregnation effect.

[0003] When impregnating ultra-thin carbon fibers, the forming mold and the spreading roller are used to stretch and extend the ultra-thin carbon fibers. The carbon fibers need to be stretched longitudinally and laterally by the spreading roller. The friction between the forming mold and the spreading roller and the carbon fibers causes the carbon fibers to be stretched and extended. During the stretching and extension, the oscillation force of the spreading roller needs to be adjusted to ensure that the carbon fibers are evenly spread out, so that the carbon fiber yarn can easily enter the low viscosity resin for uniform impregnation.

[0004] In existing yarn spreading devices, mechanical yarn spreading is usually used, which involves using the friction between spreading rollers to spread the yarn. However, the friction force is difficult to control, which makes it easy for the carbon fibers to stick together when spreading ultra-thin carbon fibers due to the friction force of the swinging motion. This increases the gap ratio between the carbon fibers, reduces the uniformity of the spread, and also affects the uniformity of the impregnation. If the friction force is too high, it can also easily cause the ultra-thin carbon fibers to break and produce loose fibers. The loose fibers cannot be fully impregnated by the resin, resulting in poor bonding between the fibers and the matrix, reducing the interlaminar shear strength of the composite material and affecting the overall performance of the carbon fiber.

[0005] Therefore, the present invention provides a yarn spreading device for producing low-resin-content ultrathin carbon fiber prepreg, which reduces the contact area between the ultrathin carbon fiber yarn and the spreading roller during the spreading process, reduces the impact of friction, and increases the uniformity of spreading by blowing air, thereby reducing mechanical wear. Summary of the Invention

[0006] To address the problems in existing technologies where single mechanical yarn spreading easily leads to high friction, and when spreading ultra-thin carbon fibers, they are easily pulled into clumps, increasing the gaps between carbon fibers, and uneven tension control causes carbon fibers to break and produce loose fibers, which affects the subsequent bonding of carbon fiber impregnation with low viscosity resin, a yarn spreading device for the production of low-resin-content ultra-thin carbon fiber prepreg was designed.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a yarn spreading device for the production of low-resin-content ultra-thin carbon fiber prepreg, including a yarn spreading support and several adjusting frames set on its top, with yarn spreading rollers arranged between the adjusting frames, and the yarn spreading rollers including a central rod, a set of limiting sleeves and an outer cylinder; The outer cylinder has equally spaced oblique holes on its surface. Inside the outer cylinder, equally spaced partition plates are fixed. An air blowing zone is located inside the outer cylinder, and a double-layered plate is installed inside the air blowing zone. The inner plate of the double-layered plate has a first air outlet, and the outer plate has a second air outlet. A gas sensor is installed on the top of the double-layered plate. An air outlet pipe is fixed inside the double-layered plate. The air outlet pipe outputs sufficient gas, which buffers the incoming airflow in the cavity inside the double-layered plate, thereby reducing turbulence and local high-pressure areas. The airflow is fully mixed before entering the cavity formed by the outer cylinder and the double-layered plate, ensuring that the airflow from the second air outlet is uniform and that the airflow velocity and flow rate from the oblique holes are consistent. This guides the airflow to flow smoothly out of the oblique holes, uniformly spreading the low-resin-content ultra-thin carbon fiber.

[0008] Furthermore, the adjustment frame includes several lifting uprights and several front and rear uprights. Each of the lifting uprights is equipped with a lifting swing mechanism, and each of the front and rear uprights is equipped with a left and right swing mechanism. The yarn spreading roller is located inside the lifting swing mechanism and the left and right swing mechanism.

[0009] Furthermore, the outer cylinder also includes a self-cleaning area, a working area, and a cleaning area. The self-cleaning area is placed opposite the air blowing area, and the working area and the cleaning area are respectively placed opposite each other between the self-cleaning area and the air blowing area. The self-cleaning area is provided with a single-layer plate and a push plate. The single-layer plate has several evenly distributed through holes. Each through hole is slidably connected to a moving rod. The top of each moving rod in the same row is fixedly connected to a connecting plate.

[0010] Furthermore, spring assemblies are fixed to the bottom of each connecting plate. The spring assemblies are evenly distributed and their bottom ends are fixed to the inner wall of the single-layer plate. The top of the connecting plate is in contact with the push plate. A positioning plate is provided inside the adjusting frame. Both ends of the push plate pass through the side wall of the limiting sleeve and are fixed to the positioning plate.

[0011] Furthermore, the inner wall of the single-layer plate is fixed with several evenly distributed limiting rings, which are fixed to the outer surface of the through hole. The bottom end of the moving rod is rotatably connected to a movable through hole head, and the side of the movable through hole head is provided with an inclined surface. The movable through hole head is located inside the through hole.

[0012] Furthermore, the self-cleaning area is equipped with a push plate, the bottom of which is fixed with several pillars, and the bottom of each pillar is fixed with several soft brushes. The surface of the single-layer plate has several long slots, through which the soft brushes penetrate.

[0013] Furthermore, there are two limiting sleeves, which are fixed to both sides of the central rod respectively, and the outer cylinder is connected to the limiting sleeves by bearings.

[0014] Furthermore, a drive motor is fixed to the side wall of the limiting sleeve, and a rotating rod is fixed to the output end of the drive motor. The rotating rod penetrates into the interior of the limiting sleeve, and a small gear is fixed to the outer surface of the rotating rod. Several evenly distributed arrays of toothed columns are fixed to the outer surface of the outer cylinder. The teeth of the toothed columns mesh with the teeth of the small gear. Both the toothed columns and the small gear are located inside the limiting sleeve.

[0015] Furthermore, both the double-layer plate and the single-layer plate are fixed to the surface of the central rod, and both the single-layer plate and the double-layer plate are attached to the partition plate to form a closed space, with the single-layer plate and the double-layer plate placed opposite each other.

[0016] Furthermore, the diameter of the first vent is smaller than that of the second vent, and the second vent is evenly distributed on the double-layer plate.

[0017] The beneficial effects of this invention are: (1) The yarn spreading device for producing low-resin-content ultra-thin carbon fiber prepreg described in this invention adopts an inclined hole blowing and double-layer plate structure on the outer cylinder to create a stable and controllable airflow environment, realizing non-contact uniform yarn spreading of carbon fiber yarn. The airflow injected by the air outlet pipe is accelerated through the first air outlet hole of the inner plate of the double-layer plate and enters the cavity of the double-layer plate. Then it is uniformly sprayed out through the 45° inclined hole on the surface of the outer cylinder, ensuring that the airflow direction and the contact angle with the yarn are constant. This not only avoids the airflow turbulence problem that may be caused by the traditional direct blowing method, but also effectively improves the uniformity of yarn spreading and prevents fiber breakage and sliver drift caused by uneven airflow. At the same time, the linkage between the gas sensor and the monitoring system enables the airflow output to be dynamically adjusted according to actual needs, further ensuring the quality of yarn spreading. The non-contact yarn spreading method greatly reduces mechanical wear, extends the service life of the equipment, and reduces maintenance costs. (2) The yarn spreading device for producing low-resin-content ultra-thin carbon fiber prepreg described in this invention achieves a 90° rotation function switch by driving the outer cylinder to rotate through gears. This moves the blocked oblique holes to the cleaning area and introduces the spare oblique holes in the cleaning area to continue working, ensuring production continuity. At the same time, through structures such as moving rods, movable through-hole heads, and spring groups, the blockages inside the oblique holes are automatically pushed out during the raising and lowering of the yarn spreading rollers, completing the initial cleaning. Through the cooperation of soft brushes and long slot holes, the oblique holes on different running and swinging yarn spreading rollers are automatically cleaned, ensuring that the airflow channel is unobstructed. This integrated self-cleaning mechanism not only significantly reduces the frequency of manual maintenance and improves the operating efficiency of the equipment, but also effectively avoids the problems of abnormal air pressure and uneven yarn spreading caused by blockage, improving the automation level and production stability of the equipment. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the yarn spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to the present invention. Figure 2 This is a three-dimensional structural schematic diagram of the cross-section of the yarn spreading device for producing low-resin-content ultra-thin carbon fiber prepreg according to the present invention. Figure 3 This is a three-dimensional structural diagram of the central rod and double-layer plate of the present invention; Figure 4 This is a three-dimensional structural diagram of the rotating outer cylinder of the present invention; Figure 5 This is a three-dimensional structural diagram of the lifting frame of the present invention; Figure 6 This is a three-dimensional structural diagram of the front and rear uprights of the present invention; Figure 7 This is a three-dimensional structural diagram of the self-cleaning structure inside the lifting frame of the present invention; Figure 8 For the present invention Figure 7 A three-dimensional magnified structural diagram of B; Figure 9 This is a cross-sectional three-dimensional structural diagram of the yarn spreading roller on the lifting frame of the present invention; Figure 10 For the present invention Figure 9 A magnified three-dimensional structural diagram of A in the middle; Figure 11 This is a cross-sectional three-dimensional structural diagram of the yarn spreading rollers on the front and rear uprights of the present invention; Figure 12 For the present invention Figure 11 A magnified three-dimensional structural diagram of C.

[0020] In the diagram: 1. Yarn spreading support; 2. Adjusting frame; 21. Lifting upright; 211. Lifting and swinging mechanism; 22. Front and rear uprights; 221. Left and right swinging mechanism; 3. Yarn spreading roller; 31. Center rod; 32. Outer cylinder; 33. Limiting sleeve; 34. Slanted hole; 35. Divider plate; 36. Gear column; 37. Rotating rod; 38. Drive motor; 39. Pinion; 4. Double-layer plate; 41. Air outlet pipe; 42. ... 43. Second air outlet; 44. Gas sensor; 5. Single-layer plate; 51. Through hole; 52. Limiting ring; 53. Moving rod; 54. Movable through hole head; 55. Inclined surface; 56. Connecting plate; 57. Spring assembly; 58. Support column; 59. Soft brush; 510. Long slot hole; 6. Air blowing area; 61. Self-cleaning area; 62. Working area; 63. Cleaning area; 7. Positioning plate; 8. Push plate. Detailed Implementation

[0021] To make the technical means, technical features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example: Figures 1-9 As shown, the yarn spreading device for producing low-resin-content ultrathin carbon fiber prepreg of the present invention includes a yarn spreading support 1 and several adjusting frames 2 disposed on its top. Yarn spreading rollers 3 are arranged between the adjusting frames 2. The yarn spreading rollers 3 include a central rod 31, a set of limiting sleeves 33 and an outer cylinder 32. The outer cylinder 32 has oblique holes 34 evenly distributed on its surface. Dividing plates 35 are fixed at equal intervals inside the outer cylinder 32. An air blowing zone 6 is arranged inside the outer cylinder. A double-layer plate 4 is arranged inside the air blowing zone 6. The inner plate of the double-layer plate 4 has a first air outlet 42, and the outer plate of the double-layer plate 4 has a second air outlet 43. A gas sensor 44 is installed on the top of the double-layer plate 4. An air outlet pipe 41 is fixed inside the double-layer plate 4, and the air outlet pipe outputs... Sufficient gas entering the cavity inside the double-layer plate 4 can buffer the incoming airflow, thereby reducing turbulence and local high-pressure areas. The airflow is fully mixed before entering the cavity formed by the double-layer plate 4 and the outer cylinder, so that the airflow blown out of the second air outlet 43 is uniform, ensuring that the airflow speed and flow rate blown out of the inclined hole 34 are consistent, and guiding the airflow to flow out smoothly from the inclined hole 34 to uniformly spread the low-resin-content ultra-thin carbon fiber. The adjustment frame 2 includes several lifting uprights 21 and several front and rear uprights 22. Each of the lifting uprights 21 is equipped with a lifting swing mechanism 211, and each of the front and rear uprights 22 is equipped with a left and right swing mechanism 221. The spreading roller 3 is located inside the lifting swing mechanism 211 and the left and right swing mechanism 221.

[0023] In this embodiment, the ultra-thin carbon fiber yarn is drawn from the yarn rack and enters the yarn spreading device. The drive roller at the center of the high-performance servo motor starts to rotate, driving the transport of the ultra-thin carbon fiber yarn. For carbon fiber yarns of different linear densities, the operator can control the degree of spreading of the ultra-thin carbon fiber yarn by adjusting the spacing of the spreading rollers 3. For ultra-thin carbon fiber yarns of different strengths and flexibility, the angle and pressure of the spreading rollers 3 can be adjusted to ensure that the ultra-thin carbon fiber yarn is not damaged during the spreading process. The tension control system located on the spreading rollers 3 will automatically adjust the motor speed or apply additional tension based on the signal feedback from the position sensor to ensure the ultra-thin carbon fiber yarn is properly spread. During the unfolding process, the tension of the fiber yarn is maintained within an ideal range. The ultra-thin carbon fiber yarn gradually unfolds under the frictional force of the unfolding roller 3 of the lifting swing mechanism 211 and the left and right swing mechanism 221. At the same time, the outer cylinder 32 of the unfolding roller 3 has an oblique hole 34, which forms a 45° angle between the oblique hole 34 and the surface of the outer cylinder 32. This ensures that the angle of contact between the air blown out from the oblique hole 34 and the surface of the carbon fiber yarn is always 45°. The air is connected to the outer blowing device through the air outlet pipe 41 in the double-layer plate 4 on the central rod 31, so that a controllable airflow is ejected from the air outlet pipe 41. The airflow passes through the first air outlet 4 in the inner plate of the double-layer plate 4. The small hole 2 accelerates the gas flow into the cavity of the double-layer plate 4. The double-layer plate 4 divides the blowing zone 6 into two cavities, making the cross-sectional area of ​​the cavity near the outer cylinder 32 smaller than that of the inner cavity of the double-layer plate 4. This allows the gas blown out of the blowing pipe to be buffered as it enters the large-section inner cavity of the double-layer plate 4, reducing turbulence and local high-pressure areas. This ensures that the airflow is fully mixed before entering the cavity outside the double-layer plate 4. Because the airflow at the second outlet 43 is already homogenized, the airflow velocity and flow rate at the oblique hole 34 are consistent. This also avoids airflow turbulence at the oblique hole 34 caused by the direct blowing out of the outlet pipe 41. This works in conjunction with the gas sensor mounted on the surface of the double-layer plate 4. The gas diaphragm on 44 senses the deformation of the diaphragm and converts the received changes into electrical signals, which are then transmitted to the monitoring system to regulate the flow rate of the gas ejected from the exhaust pipe 41. This avoids uneven airflow from the oblique hole 34, which can lead to uneven fiber spreading and breakage of the carbon fiber yarn, resulting in loose fibers and affecting the uniformity and performance of the carbon fiber yarn. The gas blown from the 45° oblique hole 34 achieves non-contact uniform fiber spreading with the carbon fiber yarn. Combined with the mechanical spreading of the spreading roller 3, it can avoid the problems of carbon fiber yarn aggregation and clouding caused by single mechanical spreading, and can also reduce mechanical wear and extend the service life of mechanical parts.

[0024] During the unwinding of ultra-thin carbon fiber yarn, the existing fibers can easily clog the oblique holes 34, thus affecting the air output and increasing the air pressure inside the unwinding roller 3. When the gas sensor 44 detects that the air pressure exceeds the range, it can be determined that the oblique holes 34 on the contact surface with the ultra-thin carbon fiber yarn are blocked. At this time, the driving force provided by the drive motor 38 can drive the rotating rod 37 to rotate, which in turn drives the pinion 39 to rotate. Through the meshing of the teeth of the pinion 39 with the gear column 36, the gear column 36 is driven to rotate, causing the outer cylinder 32 to rotate 90°. This moves the oblique holes 34 in the working area 62 to the double-layer plate 4 and into the air blowing area 6 to blow air and unwind the ultra-thin carbon fiber yarn. The blocked oblique holes 34 are then rotated to the cleaning area 63, causing the oblique holes 34 in the original cleaning area 63 to rotate to the self-cleaning area 61 for cleaning. Specifically, the outer cylinder also includes a self-cleaning area 61, a working area 62, and a cleaning area 63. The self-cleaning area 61 is placed opposite the air blowing area, and the working area 62 and the cleaning area 63 are respectively located between the self-cleaning area 61 and the air blowing area. The self-cleaning area 61 is provided with a single-layer plate 5 and a push plate 8. The single-layer plate 5 has several evenly distributed through holes 51 inside, and each through hole 51 is slidably connected to a moving rod 53. The top of each moving rod 53 in the same row is fixedly connected to a connecting plate 56. The self-cleaning area 61 located on the yarn spreading roller 3 inside the lifting frame 21 is provided with a single-layer plate 5 and a push plate 8. The single-layer plate 5 has several evenly distributed through holes 51 inside, and the through holes 51 are slidably connected to a moving rod 53 inside. Each of the moving rods 53 is slidably connected to a connecting plate 56, and the top of each moving rod 53 in the same row is fixedly connected to a connecting plate 56. The bottom of each connecting plate 56 is fixed with a spring assembly 57. The spring assemblies 57 are evenly distributed and the bottom ends of the spring assemblies 57 are fixed to the inner wall of the single-layer plate 5. The top of the connecting plate 56 is in contact with the push plate 8. The interior of the adjusting frame 2 is provided with a positioning plate 7. The two ends of the push plate 8 pass through the side wall of the limiting sleeve 33 and are fixed to the positioning plate 7. The inner wall of the single-layer plate 5 is fixed with several evenly distributed limiting rings 52. The limiting rings 52 are fixed to the outer surface of the through hole 51. The bottom end of the moving rod 53 is rotatably connected to a movable through hole head 54. The side of the movable through hole head 54 is provided with an inclined surface 55. The movable through hole head 54 is located inside the through hole 51.

[0025] In this embodiment, after the yarn spreading roller 3 is positioned and fixed in the cleaning area on the lifting frame 21 by the positioning plate 7, the push plate 8 is fixed at the highest or lowest point of the yarn spreading roller 3's swing. When the yarn spreading roller 3 swings up and down with the lifting swing mechanism 211 to spread the ultra-thin carbon fiber yarn, the push plate 8 is fixed so that the connecting plate 56 is always in contact with the side wall of the push plate 8. Then, during the upward movement of the outer cylinder 32, the moving rod 53 at the bottom of the connecting plate 56 moves inside the limiting ring 52 and moves towards the hole of the inclined hole 34 in the through hole 51. The moving rod 53 moves to the top of the movable through hole head 54 and then into the inclined hole 34. The inclined plane 55 allows the movable through-hole head 54 to rotate with the inner wall of the inclined hole 34 and move into the inclined hole 34, pushing out the carbon fiber blocked inside the inclined hole 34. When the outer cylinder 32 moves back to the positioning plate 7, the spring assembly 57 allows the moving rod 53 to move within the through hole 51, preventing the outer cylinder 32 from moving and causing the moving rod 53 to move, thus keeping the movable through-hole head 54 always inside the inclined hole 34. When the moving rod 53 moves the movable through-hole head 54 to the inside of the limit ring 52 during the repositioning, it facilitates the swinging of the outer cylinder 32. When used repeatedly, the movable through-hole head 54 can be precisely moved into the inclined hole 34.

[0026] Specifically, the self-cleaning area 61 located on the yarn spreading roller 3 inside the front and rear uprights 22 is provided with a single-layer plate 5 and a push plate 8. Several pillars 58 are fixed at the bottom of the push plate 8, and several soft brushes 59 are fixed at the bottom of the pillars 58. Several long slots 510 are opened on the surface of the single-layer plate 5, and the soft brushes 59 penetrate through the interior of the long slots 510.

[0027] In this embodiment, after the yarn spreading roller 3 is positioned and fixed in the cleaning area of ​​the front and rear uprights 22 by the positioning plate 7, when the yarn spreading roller 3 swings left and right with the left and right swinging mechanism 221 to spread the ultra-thin carbon fiber yarn, the support column 58 is located in the single layer plate 5, the soft brush 59 is located in the long slot hole 510 and the outer end of the soft brush 59 is in contact with the inner wall of the outer cylinder 32. When it is in the initial position, the soft brush 59 is not in contact with the two ends of the long slot hole 510. When swinging left and right, the outer end of the soft brush 59 moves back and forth on the surface of the inclined hole 34. During the movement, the soft brush 59 will move inside and outside the inclined hole 34 to clean the inclined hole 34, and the soft brush 59 does not affect the rotation of the outer cylinder 32.

[0028] Working Principle: In the initial state, the ultra-thin carbon fiber yarn is drawn out from the yarn rack and enters the yarn spreading device. Under the coordinated action of the lifting swing mechanism 211 and the left and right swing mechanism 221, the yarn gradually spreads out on the surface of the spreading roller 3 by friction. At the same time, the air outlet pipe 41 in the double-layer plate 4 is connected to the external air blowing device, spraying out a controllable airflow. Through the structural design of the double-layer plate 4, the airflow is evenly distributed through the oblique holes 34, thereby avoiding yarn breakage or sliver drift caused by uneven airflow. The gas sensor 44 monitors the airflow in real time to ensure the stability and consistency of the yarn spreading process. The motor drives the toothed column 36 to rotate, which drives the outer cylinder 32 to rotate, which can turn the blocked oblique hole 34 area to the clean area, and at the same time turn the clean area into the standby area. To ensure continuous operation, the cleaning process is divided into three zones: the air blowing zone 6, the cleaning zone 63, and the self-cleaning zone 61. During the up-and-down movement of the outer cylinder 32, the connecting plate 56 and the push plate 8 cooperate to allow the movable through-hole head 54 to enter the interior of the inclined hole 34, pushing out the blockage and achieving physical cleaning. When the yarn spreading roller 3 swings left and right, the soft brush 59 structure can clean the outer surface of the inclined hole 34 back and forth. Finally, after the yarn is fully spread, it enters the segmented impregnation process. The yarn is first initially impregnated in low-viscosity resin, and then deeply impregnated in high-viscosity resin to ensure that the resin fully penetrates the fiber interior, thereby improving the quality and performance of the prepreg. After drying to remove the solvent, it is wound up according to specifications to form the finished product.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg, comprising a yarn-spreading support and several adjusting frames disposed on its top, characterized in that: A yarn-spreading roller is provided between the adjusting frames. The yarn-spreading roller includes a central rod, a set of limiting sleeves, and an outer cylinder. The outer cylinder has equally spaced oblique holes on its surface. Inside the outer cylinder, equally spaced partition plates are fixed. An air blowing zone is located inside the outer cylinder, and a double-layered plate is installed inside the air blowing zone. The inner plate of the double-layered plate has a first air outlet, and the outer plate has a second air outlet. A gas sensor is installed on the top of the double-layered plate. An air outlet pipe is fixed inside the double-layered plate. The air outlet pipe outputs sufficient gas, which buffers the incoming airflow in the cavity inside the double-layered plate, thereby reducing turbulence and local high-pressure areas. The airflow is fully mixed before entering the cavity formed by the outer cylinder and the double-layered plate, ensuring that the airflow from the second air outlet is uniform and that the airflow velocity and flow rate from the oblique holes are consistent. This guides the airflow to flow smoothly out of the oblique holes, uniformly spreading the low-resin-content ultra-thin carbon fiber.

2. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: The adjustment frame includes several lifting uprights and several front and rear uprights. Each of the lifting uprights is equipped with a lifting swing mechanism, and each of the front and rear uprights is equipped with a left and right swing mechanism. The yarn spreading roller is located inside the lifting swing mechanism and the left and right swing mechanism.

3. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: The outer cylinder also includes a self-cleaning area, a working area, and a cleaning area. The self-cleaning area is placed opposite the air blowing area. The working area and the cleaning area are respectively located between the self-cleaning area and the air blowing area. The self-cleaning area is provided with a single-layer plate and a push plate. The single-layer plate has several evenly distributed through holes. Each through hole is slidably connected to a moving rod. The top of each moving rod in the same row is fixedly connected to a connecting plate.

4. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 3, characterized in that: The bottom of each connecting plate is fixed with a spring assembly. The spring assemblies are evenly distributed and the bottom ends of the spring assemblies are fixed to the inner wall of the single-layer plate. The top of the connecting plate is in contact with the push plate. The interior of the adjusting frame is equipped with a positioning plate. Both ends of the push plate pass through the side wall of the limiting sleeve and are fixed to the positioning plate.

5. The yarn-spreading device for producing low-resin-content ultra-thin carbon fiber prepreg according to claim 3, characterized in that: The inner wall of the single-layer plate is fixed with several evenly distributed limiting rings. The limiting rings are fixed to the outer surface of the through hole. The bottom end of the moving rod is rotatably connected to a movable through hole head. The side of the movable through hole head is provided with an inclined surface. The movable through hole head is located inside the through hole.

6. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 3, characterized in that: The self-cleaning area is equipped with a push plate, and several pillars are fixed to the bottom of the push plate. Several soft brushes are fixed to the bottom of the pillars. Several long slots are opened on the surface of the single-layer plate, and the soft brushes penetrate the interior of the long slots.

7. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: The set of limiting sleeves consists of two pieces, which are respectively fixed on both sides of the central rod, and the outer cylinder and the limiting sleeves are connected by bearings.

8. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: A drive motor is fixed to the side wall of the limiting sleeve, and a rotating rod is fixed to the output end of the drive motor. The rotating rod penetrates into the interior of the limiting sleeve, and a small gear is fixed to the outer surface of the rotating rod. Several evenly distributed toothed columns are fixed to the outer surface of the outer cylinder. The teeth of the toothed columns mesh with the teeth of the small gear. Both the toothed columns and the small gear are located inside the limiting sleeve.

9. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: Both the double-layer plate and the single-layer plate are fixed to the surface of the central rod, and both the single-layer plate and the double-layer plate are attached to the partition plate to form a closed space. The single-layer plate and the double-layer plate are placed opposite each other.

10. The yarn-spreading device for producing low-resin-content ultrathin carbon fiber prepreg according to claim 1, characterized in that: The diameter of the first vent is smaller than that of the second vent, and the second vent is evenly distributed on the double-layer plate.

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