A yarn spreading device for producing a small-weight carbon fiber prepreg

Abstract

The present application belongs to the technical field of composite materials, and provides a yarn spreading device for producing small-weight carbon fiber prepreg, which comprises, from front to back according to the process, a yarn feeding guide roller assembly, a yarn spreading roller assembly, a pre-yarn spreading roller assembly, a yarn spreader and a heating roller assembly; the yarn feeding guide roller assembly comprises two sets of limiting wheels, and the carbon fiber is arranged between the two sets of limiting wheels; the yarn spreading roller assembly comprises a yarn spreading wheel, which is arranged above the carbon fiber, and a plurality of yarn spreading teeth are arranged on the yarn spreading wheel, the yarn spreading teeth are used for separating the fiber tows, and a yarn spreading tooth position adjusting mechanism is further arranged between the yarn spreading teeth and the yarn spreading wheel; the pre-yarn spreading roller assembly comprises an adjusting wheel, which is arranged above the carbon fiber, and a height adjusting piece is arranged on the adjusting wheel; the yarn spreader comprises a vibrating wheel assembly, the carbon fiber penetrates through the vibrating wheel assembly and enters the heating roller assembly. The present application can improve the product quality, improve the apparent state, and solve the problems of many broken hairs and many floating hairs on the "bright surface" of the prepreg after curing.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, and in particular relates to a yarn spreading device for the production of low-grammage carbon fiber prepreg. Background Technology

[0002] Carbon fiber prepregs are increasingly used in aerospace, military equipment, and 3C electronics, especially in high-precision industries where demand is growing daily. Prepreg requirements are reaching "gram-level" precision and "micron-level" surface quality, making low-gram-weight carbon fiber prepregs with smooth, lint-free surfaces highly sought after. However, commercially available low-gram-weight carbon fiber prepregs, whether produced with domestic or imported fibers, suffer from poor fiber spreadability, uneven areal density, numerous surface gaps, and excessive lint. Furthermore, in high-precision fields like the 3C industry, some prepregs fail to meet the surface quality requirements. Summary of the Invention

[0003] The purpose of this invention is to provide a yarn spreading device for the production of low-grammage carbon fiber prepreg, so as to solve the above-mentioned problems, improve product quality, enhance appearance, and solve the problems of excessive broken fibers and loose fibers on the "glossy" surface of the prepreg after curing.

[0004] To achieve the above objectives, the present invention provides the following solution: a yarn-spreading device for producing low-grammage carbon fiber prepreg, comprising:

[0005] The yarn feeding guide roller assembly, yarn spreading roller assembly, pre-spreading roller assembly, yarn spreader and heating roller assembly are arranged sequentially from front to back according to the process;

[0006] The yarn feed guide roller assembly includes two sets of limiting wheels, with carbon fiber disposed between the two sets of limiting wheels;

[0007] The yarn spreading roller assembly includes a yarn spreading wheel located above the carbon fiber. The yarn spreading wheel is provided with a plurality of yarn spreading teeth, which are used to separate the fiber bundles. A yarn spreading tooth position adjustment mechanism is also provided between the yarn spreading teeth and the yarn spreading wheel.

[0008] The pre-spreading yarn roller assembly includes an adjusting wheel located above the carbon fiber, and the adjusting wheel is provided with a height adjusting element;

[0009] The yarn spreader includes a vibrating wheel assembly, through which carbon fibers pass and enter the heating roller assembly.

[0010] Preferably, the limiting wheel is made of an iron-nickel alloy.

[0011] Preferably, the yarn-loosening tooth position adjustment mechanism includes a tension sensor and a yarn-loosening tooth adjustment component. The yarn-loosening tooth adjustment component is disposed in the yarn-loosening wheel and is used to control the raising and lowering of a plurality of yarn-loosening teeth. The tension sensor is used to sense the pressure of the carbon fiber on the yarn-loosening teeth. The tension sensor and the yarn-loosening tooth adjustment component are electrically connected.

[0012] Preferably, a scanning camera is also provided, which is positioned above the yarn spreading wheel to identify fiber defects and the uniformity of the separated fiber bundles of carbon fibers passing through the yarn spreading wheel.

[0013] Preferably, the vibrating wheel assembly includes a front fixed wheel, a plurality of vibrating wheels and a rear fixed wheel arranged sequentially from front to back, and carbon fibers are hinged to the front fixed wheel, the plurality of vibrating wheels and the rear fixed wheel sequentially from front to back.

[0014] Preferably, the plurality of vibrating wheels are arranged in five groups, from front to back as a first horizontal vibrating wheel, a second horizontal vibrating wheel, an upper and lower vibrating wheel, a third horizontal vibrating wheel, and a fourth horizontal vibrating wheel. The first horizontal vibrating wheel, the second horizontal vibrating wheel, the third horizontal vibrating wheel, and the fourth horizontal vibrating wheel are driven by horizontal vibration driving components, and the upper and lower vibrating wheels are driven by vertical vibration driving components to drive the upper and lower vibrating wheels to perform vertical vibration.

[0015] Preferably, the vibrating wheel assembly further includes a high-speed vibrating wheel, which is disposed between the front fixed wheel and the first horizontal vibrating wheel, and the high-speed vibrating wheel is used to break up the carbon fibers.

[0016] Preferably, the surfaces of the first horizontal vibrating wheel, the second horizontal vibrating wheel, the upper and lower vibrating wheels, the third horizontal vibrating wheel, and the fourth horizontal vibrating wheel are treated with ion spraying.

[0017] Preferably, the heating roller assembly includes two sets of heating rollers distributed vertically, with carbon fiber disposed between the two sets of heating rollers. The middle cross-sectional diameter of the upper heating roller is larger than the diameters of both end faces, and the cross-sectional diameter of the heating roller transitions evenly from the middle to both sides.

[0018] Compared with existing technologies, this invention has the following advantages and technical effects: Overall, this invention can perform multi-stage pre-expansion of carbon fibers, improve the yarn unfolding effect of carbon fibers, and innovatively solve the problems of broken fibers and excessive fluff on the "glossy" surface. The yarn unfolding effect is more obvious for imported (Toray) fibers that are difficult to unfold. It can be supplied in batches to high-precision fields with extremely high requirements for surface quality. By innovating the yarn spreading wheel, adjusting wheel and yarn unfolding device, it solves the problems of poor fiber unfolding, uneven surface density, many surface gaps and excessive yarn fluff in the process of producing small-gram carbon fiber prepreg, while greatly improving production efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the yarn spreading device of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the yarn spreader of the present invention;

[0022] Figure 3 This is a schematic diagram of the yarn-spreading tooth adjustment component of the present invention;

[0023] Figure 4 for Figure 3 Enlarged view of part A in the image;

[0024] Figure 5 This is a schematic diagram of the horizontal vibration drive component of the present invention;

[0025] The components include: 1. Fiber roll; 2. Limiting wheel; 3. Yarn spreading wheel; 4. Adjusting wheel; 5. Yarn spreader; 6. Heating roller; 7. Front fixed wheel; 8. High-speed vibrating wheel; 9. First horizontal vibrating wheel; 10. Second horizontal vibrating wheel; 11. Upper and lower vibrating wheels; 12. Third horizontal vibrating wheel; 13. Fourth horizontal vibrating wheel; 14. Rear fixed wheel; 15. Yarn spreading teeth; 16. Scanning camera; 17. Vibrating wheel; 18. Base; 19. Slide groove; 20. Piston; 21. Spring; 22. Servo motor; 23. Lead screw; 24. Threaded hole; 25. First sliding seat; 26. Transmission wheel; 27. Eccentric block; 28. Motor; 29. ​​Pulley. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1-5This invention provides a yarn spreading device for producing low-grammage carbon fiber prepreg, comprising:

[0029] The yarn feeding guide roller assembly, yarn spreading roller assembly, pre-spreading roller assembly, yarn spreader 5, and heating roller assembly are arranged sequentially from front to back according to the process.

[0030] The yarn feeding guide roller assembly includes two sets of limiting wheels 2, with carbon fiber disposed between the two sets of limiting wheels 2;

[0031] The yarn spreading roller assembly includes a yarn spreading wheel 3, which is located above the carbon fiber. The yarn spreading wheel 3 is provided with a number of yarn spreading teeth 15, which are used to separate the fiber bundles. A yarn spreading tooth position adjustment mechanism is also provided between the yarn spreading teeth 15 and the yarn spreading wheel 3.

[0032] The pre-spreading roller assembly includes an adjusting wheel 4, which is located above the carbon fiber and is equipped with a height adjustment component.

[0033] The yarn spreader 5 includes a vibrating wheel assembly, through which carbon fibers pass and enter the heating roller assembly.

[0034] The main function of the limiting wheel 2 is to fix the trajectory of the carbon fiber; the main function of the yarn spreading wheel 3 is to separate the fiber bundles to achieve a yarn spreading effect; the main function of the yarn spreading tooth position adjustment mechanism is to adjust the height of several yarn spreading teeth 15 protruding from the yarn spreading wheel 3 to maintain the uniformity of the carbon fiber; the main function of the adjusting wheel 4 is to increase the tension of the separated fiber bundles by pressing down on the fiber bundles, reducing the twisting and turning of the fiber bundles, while maintaining the horizontal forward movement of the fibers; the main function of the yarn spreader 5 is to fully spread the carbon fiber; the main function of the heating roller assembly is to connect the fully spread carbon fiber bundles to the resin film for hot pressing and spreading, forming a small-grammage carbon fiber prepreg. Overall, this invention innovatively solves the problems of broken fibers and excessive fluff on the "glossy" surface, and can be supplied in batches to high-precision fields with extremely high surface quality requirements. By innovating the yarn spreading wheel, adjusting wheel, and yarn spreader, it solves the problems of poor fiber spreading, uneven surface density, many surface gaps, and excessive yarn fluff in the process of producing small-grammage carbon fiber prepreg, while greatly improving production efficiency.

[0035] The design was further optimized, limiting wheel 2 to be made of iron-nickel alloy.

[0036] The limiting wheel 2 eliminates the traditional fiber grate design. By using an iron-nickel alloy material, it can fix the fiber's trajectory and keep the fiber from deviating from the spreading wheel 3, thus solving the original problems of easy twisting, stacking, and displacement of fibers.

[0037] The scheme is further optimized. The yarn tooth position adjustment mechanism includes a tension sensor and a yarn tooth adjustment component. The yarn tooth adjustment component is set in the yarn wheel 3. The yarn tooth adjustment component is used to control the lifting and lowering of several yarn teeth 15. The tension sensor is used to sense the pressure of carbon fiber on the yarn teeth 15. The tension sensor and the yarn tooth adjustment component are electrically connected.

[0038] The scheme is further optimized. The tension sensing element includes a force-sensitive element, a resistance strain gauge, and a circuit system. The circuit system is wrapped in the yarn-loosening teeth 15. The force-sensitive element is made of aluminum alloy or iron-nickel alloy and is combined with the yarn-loosening teeth 15. The force exerted by the fiber on the yarn-loosening teeth 15 between the two yarn-loosening teeth 15 is transmitted to the force-sensitive element. The force-sensitive element transmits the pressure signal to the circuit system through the resistance strain gauge, thereby monitoring the pressure of the fiber on the yarn-loosening teeth 15.

[0039] The force-sensitive element can control the yarn-loosening tooth adjustment component by sensing the tension of the yarn bundle on the yarn-loosening tooth 15, thereby adjusting the raising and lowering of the yarn-loosening tooth 15.

[0040] Further optimization of the design includes a base 18 fixedly connected to the side wall of the yarn spreading wheel 3. The length direction of the base 18 is parallel to the axial direction of the yarn spreading wheel 3. Several grooves 19 are provided inside the base 18, arranged radially along the yarn spreading wheel 3 and distributed along its axial direction. Several yarn spreading teeth 15 are slidably connected in the grooves 19. A piston 20 is slidably connected within each groove 19. A spring 21 is fixedly connected between the piston 20 and the yarn spreading teeth 15. Several servo motors 22 are fixedly connected inside the base. A lead screw 23 is coaxially fixedly connected to the output shaft of each servo motor 22. A threaded hole 24 is provided in the center of the side of the piston 20 away from the spring 21, and the piston 20 is connected to the lead screw 23 via the threaded hole 24. A control element is provided in the yarn spreading wheel 3, the main function of which is to control the working timing of each servo motor 22.

[0041] like Figures 3-4 As shown, the control element can individually control each servo motor 22, thereby enabling individual control of the extension and retraction of each yarn-loosening tooth 15. When it is necessary to control a certain yarn-loosening tooth 15 to extend outward, the control unit can control the corresponding servo motor 22 to rotate, which in turn drives the lead screw 23 to rotate, causing the piston 20 to move in the direction of the yarn-loosening tooth 15 within the slide groove 19, and the spring 21 pushes the yarn-loosening tooth 15 outward. When it is necessary to retract the yarn-loosening tooth 15 by a certain length, the servo motor 22 is controlled to rotate in the opposite direction, which pulls the spring 21 through the piston 20, pulling the yarn-loosening tooth 15 inward.

[0042] By independently controlling each serration 15, it is easy to adapt to the production of various types of prepregs by changing the number of serrations 15.

[0043] The setting of the yarn-loosening teeth 15 eliminates the original design of the comb teeth, solving the problems of difficult operation, uneven fiber distribution, and difficulty in handling fiber defects.

[0044] To further optimize the solution, a scanning camera 16 is also provided. The scanning camera 16 is positioned above the yarn spreading wheel 3 to identify fiber defects and the uniformity of the separated fiber bundles of carbon fibers passing through the yarn spreading wheel 3.

[0045] The scanning camera 16 is an online defect scanning camera connected to the smart workshop system. The scanning camera 16 can quickly identify defects in the fibers passing through the yarn spreading wheel 3 based on defect parameters, and simultaneously remind the operator to handle the fiber defects.

[0046] Meanwhile, the optical sensor calculates the uniformity of the separated filament bundles and adjusts the position of the yarn-loosening teeth 15 by controlling the yarn-loosening tooth adjustment component to maintain fiber uniformity.

[0047] Further optimizing the design, the main function of adjusting wheel 4 is to increase tension on the separated fiber bundles, reduce the twisting and turning of the fiber bundles, and maintain the horizontal movement of the fibers. The height of adjusting wheel 4 is controlled by the height adjustment component to adjust the fiber tension and pre-spread the fibers.

[0048] The scheme is further optimized. The vibrating wheel assembly includes a front fixed wheel 7, several vibrating wheels 17 and a rear fixed wheel 14 arranged sequentially from front to back. Carbon fiber is hinged to the front fixed wheel 7, several vibrating wheels 17 and the rear fixed wheel 14 sequentially from front to back.

[0049] In a further optimized design, five groups of vibrating wheels 17 are arranged, from front to back: a first horizontal vibrating wheel 9, a second horizontal vibrating wheel 10, an upper and lower vibrating wheel 11, a third horizontal vibrating wheel 12, and a fourth horizontal vibrating wheel 13. The first horizontal vibrating wheel 9, the second horizontal vibrating wheel 10, the third horizontal vibrating wheel 12, and the fourth horizontal vibrating wheel 13 are driven by horizontal vibration drive components, while the upper and lower vibrating wheel 11 is driven by a vertical vibration drive component to drive the upper and lower vibrating wheel 11 to perform vertical vibration.

[0050] Further optimization of the scheme: the horizontal vibration drive component driving the first horizontal vibration wheel 9 includes two sets of first sliding seats 25 that are horizontally slidably connected to the device base; the third horizontal vibration wheel 12 is rotatably connected between the two first sliding seats 25; the two ends of the third horizontal vibration wheel 12 are respectively coaxially fixedly connected to transmission wheels 26; the sides of the two sets of transmission wheels 26 are respectively fixedly connected to eccentric blocks 27; a motor 28 is fixedly connected to the first sliding seat 25; a pulley 29 is fixedly sleeved on the output shaft of the motor 28; and a belt is wound between the pulley 29 and a transmission wheel 26.

[0051] The vertical vibration drive is similar in structure to the horizontal vibration drive, except that the vertical vibration drive includes two sets of second sliding seats (not shown in the figure) that are vertically slidably connected to the device base, and the upper and lower vibration wheels 11 are rotatably connected between the two sets of second sliding seats.

[0052] like Figure 5 As shown, the motor 28 rotates, driving the transmission wheel 26 to rotate via a belt, which in turn drives the first horizontal vibrating wheel 9 to rotate. Because of the eccentric block 27 on the transmission wheel 26, the rotation of the transmission wheel 26 causes the first sliding seat 25 to vibrate horizontally, thus achieving the effect of the first horizontal vibrating wheel 9 rotating and vibrating horizontally simultaneously. The working processes of the second horizontal vibrating wheel 10, the third horizontal vibrating wheel 12, the fourth horizontal vibrating wheel 13, and the upper and lower vibrating wheels 11 are similar.

[0053] Vibration yarn spreading principle: such as Figure 2 As shown, the fiber is wound in an S-shape around the first horizontal vibrating wheel 9, the second horizontal vibrating wheel 10, the upper and lower vibrating wheels 11, the third horizontal vibrating wheel 12, and the fourth horizontal vibrating wheel 13. The adjacent horizontal vibrating wheels move in opposite directions. When two vibrating wheels move in opposite directions, the fiber will be subjected to opposite forces. The fiber will be stretched up and down and left and right under the action of the vibrating wheels. When adjacent vibrating wheels move towards each other, the stretched fiber will be shaken out and flattened under the rolling action of the vibrating wheels.

[0054] In a further optimized design, the vibrating wheel assembly also includes a high-speed vibrating wheel 8, which is positioned between the front fixed wheel 7 and the first horizontal vibrating wheel 9. The high-speed vibrating wheel 8 is used to break up the carbon fiber.

[0055] The vibration drive component of the high-speed vibrating wheel 8 is similar in structure to the vertical vibration drive component. The only difference is that the upper limit of the frequency of the motor 28 is 15-20Hz, while the frequency of the motor driving the high-speed vibrating wheel 8 is required to be above 30Hz.

[0056] like Figure 2 As shown, the carbon fiber bundle wraps around from above the front fixed wheel 7 to below the high-speed vibrating wheel 8, and then alternately wraps around the first horizontal vibrating wheel 9, the second horizontal vibrating wheel 10, the third horizontal vibrating wheel 12 and the fourth horizontal vibrating wheel 13 in sequence, and finally wraps around from below the rear fixed wheel 14 into the heating roller assembly.

[0057] This invention specifies the vibration mode of several sets of vibrating wheels. A high-speed vibrating wheel 8 is used to break up the fibers. Then, the fibers sequentially pass through a first horizontal vibrating wheel 9, a second horizontal vibrating wheel 10, a third horizontal vibrating wheel 12, and a fourth horizontal vibrating wheel 13. Through multiple combinations of horizontal and vertical vibrations, the fibers are fully unfolded. This method is extremely effective when dealing with imported fibers that are difficult to unfold. For domestic fibers, some vibrations can be selectively shut off to further reduce surface fuzz.

[0058] To further optimize the design, the surfaces of the first horizontal vibrating wheel 9, the second horizontal vibrating wheel 10, the upper and lower vibrating wheels 11, the third horizontal vibrating wheel 12, and the fourth horizontal vibrating wheel 13 are treated with ion spraying.

[0059] By applying ion spraying to the surfaces of the first horizontal vibrating wheel 9, the second horizontal vibrating wheel 10, the upper and lower vibrating wheels 11, the third horizontal vibrating wheel 12, and the fourth horizontal vibrating wheel 13, the conventional dot spraying is eliminated, and a special wave-shaped spraying is adopted. This not only improves the uneven fiber unfolding phenomenon, but also has the function of smoothing and rolling the fiber bundles. This greatly improves the yarn unfolding effect while minimizing damage to the fibers, and greatly reduces the breakage and loose fibers on the fiber surface.

[0060] Further optimization of the scheme: the heating roller assembly includes two sets of heating rollers 6 distributed vertically, with carbon fiber disposed between the two sets of heating rollers 6. The diameter of the middle section of the upper heating roller 6 is larger than the diameter of both end faces, and the diameter of the cross section of the heating roller 6 transitions evenly from the middle to both sides.

[0061] Unlike conventional production which requires 3-5 pairs of heating rollers, the production of small-grammage carbon fiber prepreg only requires one pair of heating rollers. By reducing the number of heating rollers used, energy consumption is greatly reduced and production costs are saved.

[0062] Two sets of heating rollers 6 can heat-press and spread the fully unfolded filament bundle along with the resin film to form a small-gram-weight carbon fiber prepreg. By setting the heating rollers 6 to be thicker in the middle and thinner at both ends, the resin can be evenly spread from the middle to both sides, solving the problem of gaps easily appearing in small-gram-weight prepregs.

[0063] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0064] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A yarn-spreading device for producing low-grammage carbon fiber prepreg, characterized in that, include: The yarn feeding guide roller assembly, yarn spreading roller assembly, pre-spreading roller assembly, yarn spreader (5) and heating roller assembly are arranged sequentially from front to back according to the process. The yarn feeding guide roller assembly includes two sets of limiting wheels (2), and the carbon fiber is disposed between the two sets of limiting wheels (2); The yarn spreading roller assembly includes a yarn spreading wheel (3), which is located above the carbon fiber. The yarn spreading wheel (3) is provided with a plurality of yarn spreading teeth (15), which are used to separate the fiber bundles. A yarn spreading tooth position adjustment mechanism is also provided between the yarn spreading teeth (15) and the yarn spreading wheel (3). The pre-spreading yarn roller assembly includes an adjusting wheel (4), which is located above the carbon fiber and is provided with a height adjusting element; The yarn spreader (5) includes a vibrating wheel assembly, through which carbon fibers pass and into the heating roller assembly; The yarn tooth position adjustment mechanism includes a tension sensor and a yarn tooth adjustment component. The yarn tooth adjustment component is disposed in the yarn wheel (3). The yarn tooth adjustment component is used to control the lifting and lowering of a plurality of yarn teeth (15). The tension sensor is used to sense the pressure of carbon fiber on the yarn teeth (15). The tension sensor and the yarn tooth adjustment component are electrically connected. The tension sensor includes a force-sensitive element, a resistance strain gauge and a circuit system. The circuit system is wrapped in the yarn teeth (15). The force-sensitive element is combined with the yarn teeth (15). The force of the fiber passing between two yarn teeth (15) on the yarn teeth (15) is transmitted to the force-sensitive element. The force-sensitive element transmits the pressure signal to the circuit system through the resistance strain gauge to monitor the pressure of the fiber on the yarn teeth (15). The yarn-loosening tooth adjustment component includes a base (18) fixedly connected to the side wall of the yarn-loosening wheel (3). The length direction of the base (18) is parallel to the axial direction of the yarn-loosening wheel (3). A plurality of sliding grooves (19) are provided in the base (18). The plurality of sliding grooves (19) are arranged along the radial direction of the yarn-loosening wheel (3) and distributed along the axial direction of the yarn-loosening wheel (3). A plurality of yarn-loosening teeth (15) are slidably connected in the plurality of sliding grooves (19). A piston (20) is slidably connected in the sliding grooves (19). The piston (20) and the yarn-loosening teeth (15) are connected in a certain way. A spring (21) is fixedly connected between the base and the bottom. Several servo motors (22) are fixedly connected inside the base. A lead screw (23) is fixedly connected to the output shaft of the servo motor (22) along the same axis. A threaded hole (24) is opened in the middle of the side of the piston (20) away from the spring (21). The piston (20) is connected to the lead screw (23) through the threaded hole (24). A control element is provided in the yarn spreading wheel (3). The main function of the control element is to control the working time of each servo motor (22) and thereby adjust the lifting and lowering of the yarn spreading tooth (15). The vibrating wheel assembly includes a front fixed wheel (7), a plurality of vibrating wheels (17) and a rear fixed wheel (14) arranged sequentially from front to back, and carbon fiber is wound around the front fixed wheel (7), the plurality of vibrating wheels (17) and the rear fixed wheel (14) sequentially from front to back; The vibrating wheels (17) are arranged in five groups, from front to back: a first horizontal vibrating wheel (9), a second horizontal vibrating wheel (10), an upper and lower vibrating wheel (11), a third horizontal vibrating wheel (12), and a fourth horizontal vibrating wheel (13). The first horizontal vibrating wheel (9), the second horizontal vibrating wheel (10), the third horizontal vibrating wheel (12), and the fourth horizontal vibrating wheel (13) are driven by horizontal vibration driving components, and the upper and lower vibrating wheel (11) is driven by vertical vibration driving components to drive the upper and lower vibrating wheel (11) to perform vertical vibration. The vibrating wheel assembly also includes a high-speed vibrating wheel (8), which is disposed between the front fixed wheel (7) and the first horizontal vibrating wheel (9). The high-speed vibrating wheel (8) is used to break up carbon fibers.

2. The yarn-spreading device for producing low-grammage carbon fiber prepreg according to claim 1, characterized in that: The limiting wheel (2) is made of iron-nickel alloy.

3. The yarn-spreading device for producing low-grammage carbon fiber prepreg according to claim 1, characterized in that: A scanning camera (16) is also provided, which is located above the yarn spreading wheel (3) to identify fiber defects and the uniformity of the separated fiber bundles of carbon fibers passing through the yarn spreading wheel (3).

4. The yarn-spreading device for producing low-grammage carbon fiber prepreg according to claim 1, characterized in that: The surfaces of the first horizontal vibrating wheel (9), the second horizontal vibrating wheel (10), the upper and lower vibrating wheels (11), the third horizontal vibrating wheel (12), and the fourth horizontal vibrating wheel (13) are treated with ion spraying.

5. The yarn-spreading device for producing low-grammage carbon fiber prepreg according to claim 1, characterized in that: The heating roller assembly includes two sets of heating rollers (6) distributed vertically. Carbon fiber is disposed between the two sets of heating rollers (6). The diameter of the middle section of the upper heating roller (6) is larger than the diameter of the two end faces, and the diameter of the cross section of the heating roller (6) transitions evenly from the middle to both sides.

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