A rapier weft insertion method for flattening carbon fiber tows
Through the improved rapier weft guide device, the unevenness and retraction of carbon fiber fibers in traditional looms are solved by using components such as motor drive, yarn stabilizer, roller set and yarn guide block, and the high efficiency and high quality of carbon fibers are achieved. Weaving.
Patent Information
- Application Number
- CN202411287909.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2044-09-14
AI Technical Summary
Traditional rapier looms are prone to problems such as fiber unevenness and fiber retraction folds when processing carbon fibers, resulting in a decrease in the production efficiency and quality of carbon fiber fabrics.
An improved rapier weft guide device is adopted, including a yarn barrel, a motor, a yarn stabilizer, a roller set, a yarn guide block, a weft feeding rapier, a yarn press, a yarn pincher, a scissor and a weft connecting rapier, through The motor drives the yarn barrel to rotate, the yarn stabilizer eliminates axial force, the roller set flattening fibers, the yarn guide block reduces friction, the clamping mechanism of the weft feeding rapier ensures the flatness of the carbon fibers, and the yarn press and the yarn clamping device work together to fix the fibers , scissors to cut the fibers to avoid collisions.
The flatness of carbon fiber weft yarns during the conveying process is achieved, fiber retraction and wear are reduced, and weaving quality and production efficiency are improved.
Smart Images
Figure CN118814338B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a weft insertion method, in particular to a rapier weft insertion method for flattening carbon fiber tows, and belongs to the technical field of carbon fiber weaving. Background Art
[0002] Carbon fiber materials have excellent properties such as high modulus, high strength, low density, high temperature resistance and chemical corrosion resistance. They can be woven and processed into advanced fabric-reinforced composite materials with excellent performance in all aspects. They are widely used in aerospace, new energy vehicles, marine engineering and other major fields. However, the weaving process of carbon fiber is relatively difficult. Due to the high brittleness of carbon fiber, it is easy to cause fiber breakage and fluffing during the weaving process, resulting in reduced product performance and failure to meet the standards of many high-end application fields. Therefore, improving the carbon fiber adaptability of related weaving machinery is the key to improving production efficiency and product quality.
[0003] The rapier loom is the most widely used shuttleless loom with the characteristics of high speed, high degree of automation, high-efficiency production and strong adaptability to yarn varieties. The rapier device is the core mechanism for weaving carbon fiber. The carbon fiber morphology during the rapier weft insertion process affects the quality of subsequent fabrics and composite components. However, the traditional rapier device is not completely suitable for carbon fiber. The carbon fiber cross-section shrinkage is prone to occur during the weft insertion process, resulting in fiber wear, fabric uniformity and surface density significantly reduced, affecting the comprehensive performance of subsequent carbon fiber products. In order to improve the carbon fiber flattening effect of the rapier loom and prevent the fiber shrinkage phenomenon in the subsequent weaving process, the mechanical structure of the rapier loom needs to be improved.
[0004] When processing carbon fiber yarn, existing rapier looms often face problems such as uneven yarn and fiber shrinkage and wrinkles. The main reasons are: 1) The yarn is unwound from the yarn tube along the axial direction to form a yarn loop. The unwinding process lacks yarn orientation and tension control, resulting in yarn wrinkles and wear; 2) During the weft insertion process, the flat carbon fiber tow is easy to contact the periphery of the yarn guide hole, resulting in its inability to maintain its original flatness; 3) Due to the incompatibility of traditional mechanical structures, the weft delivery sword and the weft receiving sword are very likely to have yarn orientation deflection and cross-sectional shrinkage during the process of clamping and handing over carbon fiber. Existing weaving equipment and technology lack effective methods to solve these problems, which affects the production efficiency and quality of carbon fiber fabrics.
[0005] Therefore, in order to solve the above problems, it is necessary to provide an innovative rapier weft insertion method for flattening carbon fiber tows to overcome the above defects in the prior art. Summary of the invention
[0006] The object of the present invention is to provide a rapier weft insertion method for flattening carbon fiber tows, which solves the problems of fiber unevenness, fiber shrinkage and wrinkles that occur when a rapier loom processes carbon fiber, and realizes efficient and high-quality weaving of carbon fiber.
[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a rapier weft insertion method for flattening carbon fiber tows, which adopts a rapier weft insertion device, which includes a yarn drum, a motor, a weft yarn rack, a yarn stabilizer, a roller group, a yarn guide block, a weft delivery rapier, a yarn presser, a yarn clamp, scissors and a weft connection rapier; the yarn drum is placed on the weft yarn rack; the motor is installed on the weft yarn rack, which drives the yarn drum to rotate so that the carbon fiber is decoupled from the yarn drum; the yarn stabilizer, the roller group, the yarn guide block and the weft delivery rapier are arranged in sequence; the yarn presser is arranged at the front end of the weft delivery rapier; the yarn clamp and the yarn presser cooperate to fix or loosen the carbon fiber; the weft connection rapier can be connected with the weft delivery rapier; the weft connection rapier and the weft delivery rapier are respectively provided with a set of clamping mechanisms; the scissors are arranged between the weft connection rapier and the weft delivery rapier;
[0008] The weft insertion method comprises the following steps:
[0009] 1) The carbon fiber is unwound from the yarn drum, and then sent to the weft delivery rapier after passing through the yarn stabilizer, roller group and yarn guide block in sequence;
[0010] 2) After the carbon fiber is fed into the weft delivery rapier, it enters the clamping mechanism of the weft delivery rapier and is fixed by the yarn presser and the yarn clamp;
[0011] 3) The clamping mechanism of the weft delivery rapier moves forward and closes until the carbon fiber is completely clamped, and the yarn presser is lifted to release the carbon fiber;
[0012] 4) The weft-sending rapier and the weft-receiving rapier are brought together until they are in contact with each other; then the clamping mechanism of the weft-sending rapier is released, while the clamping mechanism of the weft-receiving rapier is closed, so that the carbon fiber is caught by the weft-receiving rapier to achieve handover, and the weft-receiving rapier continues to insert the weft;
[0013] 5) After the handover is completed, the weft delivery rapier returns to the initial position, and the yarn presser is pressed down again to cooperate with the yarn clamp to complete the clamping of the carbon fiber. The yarn presser is in a compressed state, so that the position of the carbon fiber is lowered and enters the clamping mechanism of the weft delivery rapier, ensuring that the weft delivery rapier clamps the carbon fiber smoothly;
[0014] 6) Finally, the scissors cut the carbon fiber; and repeat steps 3)-5) to start the next weft insertion cycle.
[0015] The rapier weft insertion method for flattening carbon fiber tows of the present invention further comprises: the yarn tube is horizontally placed on a weft yarn tube rack, so that the carbon fiber is tangentially decoupled from the yarn tube.
[0016] The rapier weft insertion method for flattening carbon fiber tows of the present invention further comprises: the yarn stabilizer is arranged vertically to eliminate the axial force and axial displacement of the debonded carbon fiber.
[0017] The rapier weft insertion method for flattening carbon fiber tows of the present invention further comprises: the roller group comprises two double rollers and a single roller arranged between the two double rollers; the upper roller of the double rollers is a hard roller, and the lower roller is a soft roller.
[0018] The rapier weft insertion method for flattening carbon fiber tows of the present invention further comprises: a flat yarn guide hole is provided on the yarn guide block, and round chamfers are provided at both ends of the yarn guide hole; and a tension sensor is built in the yarn guide block.
[0019] The rapier weft insertion method for flattening carbon fiber tows of the present invention is further as follows: the weft sending rapier includes a weft sending rapier body, and one end of the weft sending rapier body is provided with the clamping mechanism; the clamping mechanism includes a weft sending rack, a mounting frame, a first gear, an intermediate idler wheel, a second gear, a push rod, a clamping claw, a driving motor and a lead screw; wherein a limiting groove is provided on the weft sending rapier body; the weft sending rack is inserted into the limiting groove; the driving motor is installed in the limiting groove, which is connected and drives the lead screw to rotate; the lead screw and the weft sending rack are screwed together, and can drive the weft sending rack to move along the limiting groove; the mounting frame is fixed to the weft sending rapier body; the first gear and the intermediate idler wheel are coaxially pivoted to the weft sending rapier body, and the two rotate synchronously; the first gear is meshed with the weft sending rack; the second gear is meshed with the intermediate idler wheel; the clamping claw is connected to the second gear and is opened and closed by the second gear; the push rod is fixed to the end of the weft sending rack, and can abut against the clamping claw.
[0020] The rapier weft insertion method for flattening carbon fiber tows of the present invention further comprises: the first gear, the intermediate idler gear, the second gear and the clamping claw are respectively arranged symmetrically relative to the weft delivery rack; and the push rod is located between the two clamping claws.
[0021] The rapier weft insertion method for flattening carbon fiber bundles of the present invention is further as follows: the front end of the clamping claw is provided with an L-shaped stopper, the front end surface and the bottom surface of the push rod abut against the stopper, and the carbon fiber can be clamped between the stopper and the push rod, so that the carbon fiber is fixed flatly.
[0022] The rapier weft insertion method for flattening carbon fiber tows of the present invention is further as follows: a dovetail groove is provided on the top of the weft delivery rapier body; an inclined surface is provided at one end of the dovetail groove, a cavity is provided below the inclined surface, and the weft receiving rapier can extend into the cavity and receive the carbon fiber.
[0023] The rapier weft insertion method for flattening carbon fiber tows of the present invention also has the following characteristics: the clamping mechanism of the weft-joining rapier and the clamping mechanism of the weft-delivering rapier have the same structure.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] 1. The rapier weft insertion method for flattening carbon fiber tows of the present invention can ensure that the carbon fiber weft yarn remains flat during the transportation process, solves the problems of fiber unevenness, fiber shrinkage and wrinkles when the rapier loom processes carbon fiber, and improves the weaving quality.
[0026] 2. The present invention places the carbon fiber yarn tube horizontally and equips it with a tensioning system controlled by a motor to ensure that the carbon fiber is unwound in a tangential direction and remains flat, thereby avoiding wrinkles and wear of the carbon fiber during the unwinding process.
[0027] 3. The yarn stabilizer of the present invention eliminates the axial displacement of the carbon fiber during the unwinding process, ensures the stability of the carbon fiber path, and reduces the distortion and wear of the carbon fiber.
[0028] 4. The yarn guide block of the present invention has a wide and flat yarn guide hole that matches the width of the carbon fiber. It adopts rounded corners to reduce friction, ensuring that the cross-sectional shape of the carbon fiber does not change when passing through the yarn guide hole. It also monitors and controls in real time through a tension sensor to keep the carbon fiber tension uniform.
[0029] 5. The clamping structure at the front end of the weft delivery rapier of the present invention adopts the cooperation of the fixing rod and the clamping claw to ensure that the shape and tension of the carbon fiber remain unchanged during the clamping process. The groove design of the weft delivery rapier and the weft receiving rapier is specially customized for the width of the carbon fiber, reducing the orientation deflection and cross-sectional retraction of the carbon fiber during the weft insertion process, and ensuring the continuity of the weft insertion cycle.
[0030] 6. The present invention ensures the flatness and continuity of the carbon fiber during the weft insertion process through the coordinated action of the yarn presser and the yarn clamp. The yarn presser fixes the carbon fiber when in a compressed state. After the scissors cut the carbon fiber, the weft delivery rapier clamps the carbon fiber again, and the yarn presser is lifted up and released to avoid collision with the weft delivery rapier.
[0031] 7. The rapier weft insertion device used in the present invention has the characteristics of simple structure, convenient operation, easy implementation, and has good development prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a schematic diagram of the rapier weft insertion device for flattening carbon fiber tows of the present invention.
[0033] Figure 2 yes Figure 1 A three-dimensional view of the center yarn stabilizer.
[0034] Figure 3 yes Figure 1 A three-dimensional view of the twin rollers in the middle roller group.
[0035] Figure 4 yes Figure 1 A three-dimensional view of a single roller in the middle roller group.
[0036] Figure 5 yes Figure 1 A three-dimensional view of the center yarn guide block.
[0037] Figure 6 yes Figure 1 A three-dimensional view of the center-feed rapier.
[0038] Figure 7 yes Figure 1 A three-dimensional view of the mid-weft rapier.
[0039] Figure 8 yes Figure 1 Schematic diagram of the relaxed state of the middle yarn clamp and yarn presser.
[0040] Fig. 9 yes Figure 1 Schematic diagram of the clamping state of the middle yarn clamp and the yarn presser.
[0041] Fig.10 yes Figure 6 A three-dimensional view of the clamping mechanism of the mid-feed rapier.
[0042] Fig.11 yes Fig.10 A stereoscopic image of the clamping mechanism from another perspective.
[0043] Fig.12 yes Fig.10 3D exploded view of the clamping mechanism.
[0044] Fig.13 yes Fig.10 A diagram of the state in which one of the clamping claws of the clamping mechanism clamps the carbon fiber.
[0045] Fig.14 It is a three-dimensional diagram of the weft-delivering rapier and the weft-receiving rapier when they are connected.
[0046] Fig.15 yes Figure 6 Cross-section of the center-feed rapier body. DETAILED DESCRIPTION
[0047] Please refer to the instruction manual Figure 1 To Attachment Fig.15 As shown, it is a rapier weft insertion device for flattening carbon fiber tows of the present invention, which is composed of a yarn tube 1, a motor 2, a weft yarn rack 3, a yarn stabilizer 4, a roller group 5, a yarn guide block 6, a weft delivery rapier 7, a yarn presser 8, a yarn clamp 9, scissors 10 and a weft connecting rapier 11.
[0048] The yarn drum 1 is placed on a weft yarn rack 3, on which carbon fibers 12 are wound. In this embodiment, the yarn drum 1 is horizontally placed on the weft yarn rack 3, so that the carbon fibers 12 are tangentially decoupled from the yarn drum 1, ensuring that the delivered carbon fibers 12 are in a flat state.
[0049] The motor 2 is installed on the weft yarn tube frame 3, which drives the yarn tube 1 to rotate, so that the carbon fiber 12 can be actively unwound from the yarn tube 1. By controlling the speed of the motor 2, the tension of the carbon fiber 12 is adjusted to ensure that the tension of the carbon fiber 12 is uniform during the weaving process, prevent the carbon fiber 12 from being too loose or too tight, keep it flat, and avoid wrinkles and wear of the carbon fiber 12 during the unwinding process.
[0050] The yarn stabilizer 4, the roller group 5, the yarn guide block 6 and the weft delivery rapier 7 are arranged in sequence. In this embodiment, the yarn stabilizer 4 is arranged vertically. Since the carbon fiber 12 is unwound and delivered along the tangential direction, there will be a certain axial force. After the carbon fiber 12 passes through the yarn stabilizer 4, the unwound carbon fiber 12 eliminates the axial force and axial displacement, ensures the path of the carbon fiber 12 is stable, and reduces the distortion and wear of the carbon fiber 12.
[0051] The roller group 5 is used to further flatten the carbon fiber 12 to ensure the flatness of the carbon fiber 12 during the entire transmission process. The roller group 5 includes two double rollers 51 and a single roller 52 arranged between the two double rollers 51. The upper roller of the double roller 51 is a hard roller, which is used to flatten the carbon fiber 12; the lower roller is a soft roller, which, on the one hand, increases the roughness so that the roller has a better grip; on the other hand, because the material is soft, due to the presence of tension, there will be slight deformation on the surface of the roller, which can better ensure the flattening effect. The purpose of the single roller 52 is to change the radial position of the carbon fiber 12 to ensure that the carbon fiber 12 is tensioned. The last roller is also a double roller 51, which performs the last step of flattening so that the cross-sectional shape of the carbon fiber 12 will not change after it is sent out.
[0052] The yarn guide block 6 is provided with a flat yarn guide hole 61 to ensure that the shape of the carbon fiber 12 is not changed when passing through the yarn guide hole 61. Both ends of the yarn guide hole 61 are provided with rounded chamfers 62 to reduce friction and ensure that the cross-sectional shape of the carbon fiber 12 is not changed when passing through the yarn guide hole 61. The yarn guide block 61 has a built-in tension sensor, which is monitored in real time by the tension sensor. The motor 2 can be dynamically adjusted according to the real-time detected tension data of the carbon fiber 12 to ensure that the tension is always in the best state.
[0053] Furthermore, the weft sending rapier 7 includes a weft sending rapier body 70, and one end of the weft sending rapier body 70 is provided with a clamping mechanism 72 for clamping the carbon fiber 12. The clamping mechanism 72 can ensure that the shape and tension of the carbon fiber 12 remain unchanged during the clamping process, and is composed of a weft sending rack 721, a mounting frame 722, a first gear 723, an intermediate idler wheel 724, a second gear 725, a push rod 726, a clamping claw 727, a drive motor 728, and a lead screw 729.
[0054] The weft sending rapier body 70 is provided with a limiting groove 71, and the weft sending rack 721 is inserted into the limiting groove 71. The driving motor 728 is installed in the limiting groove 71, and is connected to and drives the lead screw 729 to rotate. The lead screw 729 is screwed to the weft sending rack 721, and can drive the weft sending rack 721 to move along the limiting groove 71.
[0055] The mounting frame 722 is fixed on the weft sending rapier body 70. The first gear 723 and the intermediate idler wheel 724 are coaxially pivoted on the weft sending rapier body 70, and the two rotate synchronously. The first gear 723 is meshed with the weft sending rack 721. The second gear 725 is meshed with the intermediate idler wheel 724, and the second gear 725 is pivoted on the mounting frame 722.
[0056] The clamping claw 727 is connected to the second gear 725 and is opened and closed by the second gear 725. The push rod 726 is fixed to the end of the weft feeding rack 721 and can abut against the clamping claw 727.
[0057] In this embodiment, the first gear 723 , the intermediate idler gear 724 , the second gear 725 and the clamping claw 727 are respectively arranged symmetrically with respect to the weft feeding rack 721 , so that the clamping mechanism 72 is symmetrically arranged. The push rod 726 is located between the two clamping claws 727 .
[0058] The front end of the clamping claw 727 is provided with an L-shaped stop portion 730, and the front end surface and bottom surface of the push rod 726 abut against the stop portion 730. The carbon fiber 12 can be clamped between the stop portion 730 and the push rod 726, so that the carbon fiber 12 is fixed flatly and prevents the carbon fiber 12 from sliding or deforming during the weft insertion process.
[0059] The working principle of the clamping mechanism 72 is as follows: the lead screw 729 is driven to rotate by the driving motor 728, and the lead screw 729 rotates to push out the weft feeding rack 721, and the weft feeding rack 721 is limited by the limiting groove 71 of the weft feeding rapier 7, and can only move along the extension direction of the limiting groove 71. The weft feeding rack 721 moves, thereby driving the first gear 723 to rotate, the first gear 723 links the intermediate idler wheel 724 to rotate, the intermediate idler wheel 724 then drives the second gear 725 to rotate, and the second gear 725 links the clamping claw 727 to rotate, so that the clamping claw 727 is closed; at the same time, the push rod 726 is pushed out by the linkage of the weft feeding rack 721, and cooperates with the clamping claw 727 to clamp the carbon fiber 12 between the push rod 726 and the clamping claw 727.
[0060] A dovetail groove 701 is provided on the top of the weft-feeding rapier body 70. The bottom width of the dovetail groove 701 is slightly larger than the width of the carbon fiber 12 in a normal state, ensuring that the cross-sectional shape of the carbon fiber 12 does not deform too much. The top width of the dovetail groove 701 is slightly smaller than the width of the carbon fiber 12, which can prevent the carbon fiber 12 from sliding out during the weft-feeding process. The dovetail groove 701 can also reduce the directional deflection and cross-sectional retraction of the carbon fiber 12 during the weft insertion process, ensuring the continuity of the weft insertion cycle. A slope 702 is provided at one end of the dovetail groove 701, and a cavity 703 is provided below the slope 702.
[0061] The weft receiving rapier 11 can be connected to the weft sending rapier 7. Specifically, the weft receiving rapier 11 can extend into the cavity 703 of the weft sending rapier 7 and receive the carbon fiber 12. The weft receiving rapier 11 is also provided with a clamping mechanism 72 with the same structure as the clamping mechanism 72 of the weft sending rapier 7. The structures and working principles of the two are the same, which will not be repeated here.
[0062] The yarn presser 8 is arranged at the front end of the weft delivery rapier 7. The yarn clamp 9 cooperates with the yarn presser 8 to fix or loosen the carbon fiber 12. Through the synergistic effect of the yarn clamp 9 and the yarn presser 8, the flatness and continuity of the carbon fiber 12 during the weft insertion process are ensured. The scissors 10 are arranged between the weft receiving rapier 11 and the weft delivery rapier 7, and can cut the carbon fiber 12.
[0063] The yarn presser 8 has two states: a compressed state and a relaxed state. In the compressed state, the yarn clamp 9 and the yarn presser 8 are in contact; in the relaxed state, the yarn presser 8 is lifted. After the first weft insertion, the weft delivery rapier 7 returns to the initial position. At this time, the yarn presser 8 presses the carbon fiber 12 down to the yarn clamp 9, and the yarn presser 8 is in a compressed state to ensure that the carbon fiber 12 is in the dovetail groove 701 of the weft delivery rapier 7. Subsequently, the scissors 10 cut the carbon fiber 12 until the clamping claw 727 at the front end of the weft delivery rapier 7 clamps the carbon fiber 12 again, and the yarn presser 8 is lifted to release the carbon fiber 12. At this time, the yarn presser 8 is in a relaxed state to avoid collision with the weft delivery rapier 7 during operation.
[0064] The method for flattening and weft inserting carbon fiber tows using the rapier weft insertion device comprises the following steps:
[0065] 1), the carbon fiber 12 is unwound from the yarn drum 1, and is sent to the weft sending rapier 7 after passing through the yarn stabilizer 4, the roller group 5 and the yarn guide block 6 in sequence.
[0066] 2) After the carbon fiber 12 is fed into the weft sending rapier 7, it enters the clamping mechanism 72 of the weft sending rapier 7 and is fixed by the yarn presser 8 and the yarn clamp 9.
[0067] 3) The clamping mechanism 72 of the weft delivery rapier 7 moves forward and closes until the carbon fiber 12 is completely clamped, thereby ensuring that the carbon fiber 12 maintains its shape and width during the weft insertion process. Afterwards, the yarn presser 8 is lifted to release the carbon fiber 12.
[0068] 4) The weft sending rapier 7 and the weft receiving rapier 11 are brought closer together until the weft sending rapier 7 and the weft receiving rapier 11 are in contact with each other, that is, the weft receiving rapier 11 enters the cavity 703 of the weft sending rapier 7. After that, the clamping mechanism 72 of the weft sending rapier 7 is released, and the clamping mechanism 72 of the weft receiving rapier 11 is closed, so that the carbon fiber 12 is caught by the weft receiving rapier 11 and the weft receiving rapier 11 continues the weft insertion work.
[0069] 5) After the handover is completed, the weft delivery rapier 7 returns to the initial position. After the weft receiving rapier 11 takes over the carbon fiber 12, the carbon fiber 12 is slightly higher than the clamping claw 727 of the weft delivery rapier 7. At this time, the yarn presser 8 is pressed down again to cooperate with the yarn clamp 9 to complete the fixation of the carbon fiber 12. The yarn presser 8 is in a compressed state, so that the position of the carbon fiber 12 is lowered and enters the clamping mechanism 72 of the weft delivery rapier 7, ensuring that the weft delivery rapier 7 can clamp the carbon fiber 12 smoothly.
[0070] 6), finally, the scissors 10 cut the carbon fiber 12; and repeat steps 3)-5), and the next weft insertion cycle begins, thereby achieving efficient and high-quality weaving of carbon fiber.
[0071] The above specific implementation methods are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A rapier weft insertion method for flattening carbon fiber tows, characterized in that: It adopts a rapier weft insertion device, which includes a yarn drum, a motor, a weft yarn rack, a yarn stabilizer, a roller group, a yarn guide block, a weft delivery rapier, a yarn presser, a yarn clamp, scissors and a weft joining rapier; the yarn drum is placed on the weft yarn rack; the motor is installed on the weft yarn rack, and drives the yarn drum to rotate so that the carbon fiber is unwound from the yarn drum; the yarn stabilizer, the roller group, the yarn guide block and the weft delivery rapier are arranged in sequence; the yarn presser is arranged at the front end of the weft delivery rapier; the yarn clamp and the yarn presser cooperate to fix or loosen the carbon fiber; the weft joining rapier can be connected to the weft delivery rapier; the weft joining rapier and the weft delivery rapier are respectively provided with a set of clamping mechanisms; the scissors are arranged between the weft joining rapier and the weft delivery rapier; The yarn stabilizer is arranged vertically to eliminate the axial force and axial displacement of the debonded carbon fibers; The yarn guide block is provided with a flat yarn guide hole, and both ends of the yarn guide hole are provided with round chamfers; the yarn guide block is built-in with a tension sensor; The weft-sending rapier comprises a weft-sending rapier body, and one end of the weft-sending rapier body is provided with the clamping mechanism; the clamping mechanism comprises a weft-sending rack, a mounting frame, a first gear, an intermediate idler wheel, a second gear, a push rod, a clamping claw, a driving motor and a lead screw; wherein a limiting groove is provided on the weft-sending rapier body; the weft-sending rack is inserted into the limiting groove; the driving motor is installed in the limiting groove, and it is connected to and drives the lead screw to rotate; the lead screw and the weft-sending rack are screwed together, and it can drive the weft-sending rack to move along the limiting groove; the mounting frame is fixed to the weft-sending rapier body; the first gear and the intermediate idler wheel are coaxially pivoted to the weft-sending rapier body, and the two rotate synchronously; the first gear and the weft-sending rack are meshed; the second gear and the intermediate idler wheel are meshed; the second gear is pivoted to the mounting frame; the clamping claw is connected to the second gear, and is opened and closed by the second gear; the push rod is fixed to the end of the weft-sending rack, and it can abut against the clamping claw; The first gear, the intermediate idler gear, the second gear and the clamping claw are arranged symmetrically relative to the weft feeding rack; the push rod is located between the two clamping claws; The front end of the clamping claw is provided with an L-shaped stopper, the front end surface and the bottom surface of the push rod abut against the stopper, and the carbon fiber can be clamped between the stopper and the push rod, so that the carbon fiber is fixed flatly; A dovetail groove is provided on the top of the weft delivery rapier body; an inclined surface is provided at one end of the dovetail groove, and a cavity is provided below the inclined surface, and the weft receiving rapier can extend into the cavity and receive the carbon fiber; The structure of the clamping mechanism of the weft receiving rapier is the same as that of the clamping mechanism of the weft sending rapier; The weft insertion method comprises the following steps: 1) The carbon fiber is unwound from the yarn drum, and then sent to the weft delivery rapier after passing through the yarn stabilizer, roller group and yarn guide block in sequence; 2) After the carbon fiber is fed into the weft delivery rapier, it enters the clamping mechanism of the weft delivery rapier and is fixed by the yarn presser and the yarn clamp; 3) The clamping mechanism of the weft delivery rapier moves forward and closes until the carbon fiber is completely clamped, and the yarn presser is lifted to release the carbon fiber; 4) The weft-sending rapier and the weft-receiving rapier are brought together until they are in contact with each other; then the clamping mechanism of the weft-sending rapier is released, while the clamping mechanism of the weft-receiving rapier is closed, so that the carbon fiber is caught by the weft-receiving rapier to achieve handover, and the weft-receiving rapier continues to insert the weft; 5) After the handover is completed, the weft delivery rapier returns to the initial position, and the yarn presser is pressed down again to cooperate with the yarn clamp to complete the clamping of the carbon fiber. The yarn presser is in a compressed state, so that the position of the carbon fiber is lowered and enters the clamping mechanism of the weft delivery rapier, ensuring that the weft delivery rapier clamps the carbon fiber smoothly; 6) Finally, the scissors cut the carbon fiber; and repeat steps 3)-5) to start the next weft insertion cycle.
2. The rapier weft insertion method for flattening carbon fiber tows according to claim 1, characterized in that: The yarn tube is horizontally placed on a weft yarn tube frame so that the carbon fibers are tangentially decoupled from the yarn tube.
3. The rapier weft insertion method for flattening carbon fiber tows according to claim 1, characterized in that: The roller group comprises two double rollers and a single roller arranged between the two double rollers; the upper roller of the double rollers is a hard roller, and the lower roller is a soft roller.