Monofilament prepreg yarn dry-method winding equipment and tension control method

Abstract

The invention discloses monofilament prepreg yarn dry-method winding equipment and a tension control method, and relates to the technical field of composite material forming, the monofilament prepreg yarn dry-method winding equipment comprises an unwinding yarn box, a yarn roll is connected with a driving motor and used for outputting yarn, the yarn is wound on a hook leg buffer mechanism after being led out of the yarn roll, and the hook leg buffer mechanism is used for adjusting the tension of the yarn; a main shaft is rotatably arranged on the gantry frame in the length direction, and a mold is arranged on the main shaft; the moving trolley is in sliding connection with the gantry frame in the length direction of the gantry frame, the moving trolley is provided with a yarn winding nozzle, the yarn winding nozzle corresponds to the mold, and the yarn enters the yarn winding nozzle after being led out of the hook leg buffering mechanism and is wound on the mold. According to the invention, high-speed automatic winding of monofilament prepreg yarns can be realized, the automation degree is high, and the production efficiency is improved. The yarn tension output by each yarn roll is independently adjusted based on the tension after stranding, the control precision of the yarn tension is improved, the tension is kept stable, and therefore the yarn winding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material forming, and particularly to a dry winding device for single-filament prepreg yarn and a tension control method thereof. Background Art

[0002] Carbon fiber single-filament prepreg yarn is an intermediate material obtained by pre-impregnating and combining carbon fiber single filaments and resin through a specific process. Because the resin content is more accurate and cleaner compared to wet winding, it has been widely used.

[0003] Existing dry winding devices for single-filament prepreg yarn have low production efficiency, low automation level, and are difficult to control and maintain stable tension.

[0004] In view of this, how to provide a dry winding device for single-filament prepreg yarn and a tension control method is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a dry winding device for single-filament prepreg yarn and a tension control method to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the present invention provides a dry winding device for single-filament prepreg yarn, including:

[0007] A unwinding yarn box, which contains multiple yarn reels, and the yarn reels are connected to a driving motor for outputting yarn;

[0008] Multiple hook-leg buffer mechanisms, which are arranged in the unwinding yarn box and correspond to the multiple yarn reels one by one. The yarn is led out from the yarn reel and wound around the hook-leg buffer mechanism, and the hook-leg buffer mechanism is used to adjust the tension of the yarn;

[0009] A gantry frame, on which a main shaft is rotatably arranged along the length direction. The main shaft is driven to rotate by a main shaft power mechanism, and a mold is arranged on the main shaft;

[0010] A moving trolley, which is slidably connected to the gantry frame along the length direction of the gantry frame. A winding nozzle is arranged on the moving trolley, and the winding nozzle corresponds to the mold. The yarn is led out from the hook-leg buffer mechanism, enters the winding nozzle, and is wound on the mold.

[0011] Furthermore, it further includes:

[0012] A measurement sensor. The multiple yarn reels are arranged in a stepped manner up and down, and the measurement sensor is arranged in the unwinding yarn box for detecting the diameter of the yarn reel;

[0013] A control system, which is communicatively connected to the measurement sensor.

[0014] Furthermore, the hook-leg buffer mechanism includes:

[0015] A cylinder, which is connected to the unwinding yarn box and communicatively connected to the control system, and its output end extends downward and is connected to the tensioning guide roller;

[0016] The first guide roller and the second guide roller are respectively arranged on the left and right sides of the tensioning guide roller, and the height of the tensioning guide roller is higher than that of the first guide roller and the second guide roller. The first guide roller is close to the yarn roll;

[0017] The yarn is drawn out from the yarn roll and sequentially wound around the lower surface of the first guide roller, the upper surface of the tensioning guide roller, and the lower surface of the second guide roller. After being drawn out from the second guide roller, the yarn enters the winding nozzle.

[0018] Further, it further includes:

[0019] A first tension sensor. A nozzle box body is arranged on the moving trolley. The winding nozzle is arranged on the nozzle box body. The first tension sensor is arranged in the nozzle box body. The yarn is drawn out from the second guide roller, stranded and enters the nozzle box body, and enters the winding nozzle after the tension is detected by the first tension sensor. The first tension sensor is communicatively connected to the control system.

[0020] Further, it further includes: a BOPP film winding mechanism. After the yarn is wound on the mold, the BOPP film winding mechanism winds the BOPP film on the mold.

[0021] Further, the BOPP film winding mechanism includes:

[0022] A BOPP film roll, which is arranged on the moving trolley and connected to a magnetic powder brake for outputting BOPP film material;

[0023] A secondary tension increasing mechanism, which is arranged on the moving trolley for amplifying the tension of the BOPP film material. The BOPP film material output by the BOPP film roll is wound around the secondary tension increasing mechanism;

[0024] A second tension sensor. The BOPP film material is drawn out from the secondary tension increasing mechanism, and after the tension is detected by the second tension sensor, it is wound onto the mold. The magnetic powder brake, the second tension sensor, and the secondary tension increasing mechanism are communicatively connected to the control system.

[0025] Further, the secondary tension increasing mechanism includes a plurality of tension amplifiers. The tension amplifiers are driven by a tension magnetic powder controller. The BOPP film material is sequentially wound around the plurality of tension amplifiers. The tension magnetic powder controller is communicatively connected to the control system.

[0026] Further, a first pneumatic chuck is arranged on the main shaft. The first pneumatic chuck is used for clamping the mold, and the main shaft center has an inflation structure.

[0027] Further, a second pneumatic chuck is slidably arranged along the length direction of the gantry frame, and the first pneumatic chuck and the second pneumatic chuck jointly clamp the mold.

[0028] The present invention also provides a method for controlling the tension of a single-filament prepreg dry winding equipment, which is applied to the single-filament prepreg dry winding equipment and includes the following steps:

[0029] Set the target tension after yarn ply twisting to be F 总 , the actual tension detected by the first tension sensor is F 检 , the tension generated by resistance and friction is F1, the tension generated by a single yarn bobbin is F2, the number of yarn bobbins is n, the torque generated by the driving motor is T, and the radius of the yarn bobbin is R;

[0030] F 检 = nF2 + F1;

[0031] F2 = T / R;

[0032] Detect F through the control system 检 and compare it with F 总 . When F 检 is different from F 总 , adjust the torque generated by the driving motor according to the radius of the yarn bobbin, and through PID closed-loop control until Ftotal is the same as or close to Fdetect.

[0033] The present invention discloses the following technical effects:

[0034] 1. The present invention can realize the high-speed automatic winding of single-filament prepreg, with high automation degree and improved production efficiency.

[0035] 2. The present invention can detect the tension after the yarns output from multiple yarn bobbins are ply twisted, independently adjust the tension of the yarns output from each yarn bobbin based on the tension after ply twisting, and the tension deviation of the yarns output from each yarn bobbin does not exceed 1 N, improving the control accuracy of the yarn tension and maintaining the tension stability. At the same time, when the yarn winding speed changes, the hook leg buffer mechanism can also reduce the tension fluctuation, further improving the yarn tension stability, thereby improving the yarn winding quality.

[0036] 3. After the yarn winding is completed, the present invention winds the BOPP film on the mold to wind and cure the mold, preventing the tension from loosening and the resin from flowing; the BOPP film is discharged by a magnetic powder brake, and after the tension is amplified by a two-stage tension increasing mechanism, it enters the second tension sensor for tension detection, and the control system controls the magnetic powder brake and the tension magnetic powder controller to complete the closed-loop control based on the detection data of the second tension sensor. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 Structural schematic diagram of the present invention;

[0039] Figure 2 For Figure 1 Schematic diagram of the back side;

[0040] Figure 3 Structural schematic diagram of the unwinding yarn box;

[0041] Figure 4 Schematic diagram of the leg-hooking buffer mechanism;

[0042] Figure 5 Schematic diagram of the gantry frame;

[0043] Figure 6 Working principle diagram of the present invention;

[0044] Among them, 1. Unwinding yarn box; 2. Yarn roll; 3. Driving motor; 4. Gantry frame; 5. Main shaft power mechanism; 6. Die; 7. Moving trolley; 8. Winding nozzle; 9. Measuring sensor; 10. Cylinder; 11. Tensioning guide roller; 12. First guide roller; 13. Second guide roller; 14. First tension sensor; 15. Nozzle box body; 16. BOPP film material roll; 17. Magnetic powder brake; 18. Secondary tension increasing mechanism; 19. Second tension sensor. Specific embodiments

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0047] The embodiments of the present invention provide a single-filament prepreg dry winding device, including:

[0048] The unwinding yarn box 1 has multiple yarn reels 2 built in it. The yarn reels 2 are connected to a drive motor 3 for outputting yarn. Multiple guide rollers are arranged in a preset path in the unwinding yarn box 1. After the yarn is drawn out from the yarn reels 2, it is shaped and arranged by the multiple guide rollers.

[0049] A plurality of hook leg buffer mechanisms are arranged in the unwinding yarn box 1 and are arranged one-to-one corresponding to the plurality of yarn reels 2. The yarn is drawn out from the yarn reel 2 and wound around the hook leg buffer mechanism. The hook leg buffer mechanism is used to adjust the tension of the yarn and buffer the tension fluctuation caused by speed changes during winding;

[0050] The gantry frame 4 is welded from steel plates and has high rigidity and stability. It is fixed to the foundation by anchor bolts, and the geometric accuracy of the machine base can be adjusted by adjusting nuts. The gantry frame 4 is rotatably provided with a main shaft along its length. The main shaft is driven to rotate by a main shaft power mechanism 5, and a mold 6 is provided on the main shaft.

[0051] The movable trolley 7 is slidably connected to the gantry frame 4 along the length direction of the gantry frame 4. A winding nozzle 8 is provided on the movable trolley 7. The winding nozzle 8 corresponds to the mold 6. The yarn is drawn out from the hook leg buffer mechanism and enters the winding nozzle 8 and is wound on the mold 6.

[0052] In this embodiment, it also includes:

[0053] The measuring sensor 9 is arranged in an upper and lower stepped manner. The measuring sensor 9 is provided in the unwinding yarn box 1 for detecting the diameter of the yarn roll 2. A new unwinding method is adopted in which the driving motor 3 is combined with the yarn roll 2 diameter measurement;

[0054] The control system is in communication with the measuring sensor 9 and changes the torque output of the driving motor 3 in real time by detecting the diameter of the yarn roll 2 to ensure stable yarn tension.

[0055] In this embodiment, the leg hook buffer mechanism includes:

[0056] The cylinder 10 is a low-friction cylinder 10, which is connected to the unwinding box 1 and is in communication with the control system, and its output end extends downward and is connected to the tensioning guide roller 11;

[0057] The first guide roller 12 and the second guide roller 13 are respectively arranged on the left and right sides of the tensioning guide roller 11, and the height of the tensioning guide roller 11 is higher than the first guide roller 12 and the second guide roller 13, and the first guide roller 12 is close to the yarn roll 2;

[0058] After being drawn out from the yarn reel 2, the yarn is sequentially wound around the lower surface of the first guide roller 12, the upper surface of the tensioning guide roller 11 and the lower surface of the second guide roller 13. After being drawn out from the second guide roller 13, the yarn enters the winding nozzle 8.

[0059] In this embodiment, it also includes:

[0060] The first tension sensor 14 is provided on the moving trolley 7. A nozzle box body 15 is arranged on the moving trolley 7, and a winding nozzle 8 is arranged on the nozzle box body 15. The first tension sensor 14 is arranged inside the nozzle box body 15. The yarn is led out from the second guide roller 13, stranded and then enters the nozzle box body 15. After the tension is detected by the first tension sensor 14, it enters the winding nozzle 8. The first tension sensor 14 is communicatively connected to the control system.

[0061] By detecting the tension of the stranded yarn, comparing the detected data with the preset target value, and then adjusting the tension of the single-strand yarn in the hook leg buffer mechanism. Specifically, the tension of the single-strand yarn can be adjusted by adjusting the height of the tensioning guide roller 11. The tension deviation of the yarn output from each yarn bobbin 2 does not exceed 1 N. In addition, the tension adjustment of each strand of yarn is independently completed and has no influence on each other, which can ensure that the tension of each strand of yarn is constant and avoid the yarn from sagging.

[0062] In this embodiment, the winding nozzle 8 realizes the special-shaped winding of complex parts through five-axis interpolation motion. Specifically, the moving trolley 7 moves along the Z-axis, the telescopic arm moves along the X-axis, the nozzle yaw B-axis moves, the nozzle rotation A-axis moves, and the main shaft C-axis rotates, jointly realizing the five-axis numerical control interpolation motion. The moving trolley 7 adopts a lightweight design and can realize high-speed moving winding. The movement of the trolley is driven by a servo motor through a reducer to drive a rack and pinion transmission, and is supported by a linear guide rail. The maximum moving speed can reach 120 m / min. The telescopic arm X-axis is vertically arranged at 90 degrees perpendicular to the moving trolley 7 and is driven by a servo motor directly driving a ball screw. The yaw B-axis is located below the telescopic arm and is driven by a servo motor to rotate a hollow reducer. In addition to the advantages of high precision and large load, the hollow structure of the hollow reducer can also be used for wire routing. The nozzle box body 15 is fixed below the yaw B-axis to drive the box body to rotate. The specific working process of the five-axis interpolation motion belongs to the prior art and will not be elaborated here. In some other embodiments, the above mechanism can also be replaced by other five-axis motion mechanisms, and the corresponding models and sizes can be adjusted adaptively.

[0063] In this embodiment, the nozzle rotation A-axis is located on the front side of the nozzle box body 15 and adopts a hollow reducer, which is convenient for threading. The nozzle rotation A-axis is connected to the winding nozzle 8.

[0064] In this embodiment, it further includes: a BOPP film winding mechanism, which is located at the rear side of the nozzle box body 15. When the yarn is wound on the mold 6, the BOPP film winding mechanism winds the BOPP film on the mold 6.

[0065] In this embodiment, the BOPP film winding mechanism includes:

[0066] A BOPP film reel 16, which is arranged on the moving trolley 7 and connected to a magnetic powder brake 17 for outputting the BOPP film material;

[0067] The secondary tension increasing mechanism 18 is arranged on the moving trolley 7 for amplifying the tension of the BOPP film material. The BOPP film material output from the BOPP film material roll 16 is wound around the secondary tension increasing mechanism 18.

[0068] The second tension sensor 19. The BOPP film material is led out from the secondary tension increasing mechanism, passes through the second tension sensor 19 for tension detection, and then is wound around the die 6. The magnetic powder brake 17, the second tension sensor 19, and the secondary tension increasing mechanism 18 are communicatively connected to the control system.

[0069] In this embodiment, the secondary tension increasing mechanism 18 includes a plurality of tension amplifiers. The tension amplifiers are driven by a tension magnetic powder controller. The BOPP film material is sequentially wound around the plurality of tension amplifiers. The tension magnetic powder controller is communicatively connected to the control system.

[0070] Taking four tension amplifiers as an example, the total tension amplification coefficient is K = K1 * K2 * K3 * K4, where Ki is the amplification coefficient of each stage.

[0071] In this embodiment, a first pneumatic chuck is arranged on the main shaft. The first pneumatic chuck is used for clamping the die 6. The center of the main shaft has an inflation structure, which can realize automatic inflation with large pressure, has a pressure detection sensor to realize closed-loop inflation, and has the functions of constant stamping and step-by-step pressurized inflation. The gantry frame 4 is slidably provided with a second pneumatic chuck along the length direction. The first pneumatic chuck and the second pneumatic chuck jointly clamp the die 6. To adapt to dies 6 of different lengths, the tailstock is provided with a pneumatic chuck and a center, which can realize automatic clamping and fixing together with the main shaft.

[0072] In this embodiment, it further includes an operation control system, which adopts a floor-standing structure, facilitating the operator to tow it to any position, conforming to ergonomics, and being more convenient and efficient.

[0073] The embodiment of the present invention also provides a tension control method for a single-filament prepreg dry winding equipment. Applying the single-filament prepreg dry winding equipment, it includes the following steps:

[0074] Set the target tension after yarn ply twisting to be F 总 , the actual tension detected by the first tension sensor 14 is F 检 , the tension generated by resistance and friction is F1, the tension generated by a single yarn bobbin 2 is F2, the number of yarn bobbins 2 is n, the torque generated by the drive motor 3 is T, and the radius of the yarn bobbin 2 is R;

[0075] F 检 = nF2 + F1;

[0076] F2 = T / R;

[0077] Detect F 检 through the control system and compare it with F总 In contrast, when F 检 differs from F 总 is different, the torque generated by the drive motor 3 is adjusted according to the radius of the yarn roll 2, and through PID closed-loop control until the total F is the same as or close to the detected F.

[0078] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0079] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. Dry winding equipment for single-filament prepreg yarn, characterized in that, include: A yarn unwinding box (1) having a plurality of yarn reels (2) therein, wherein the yarn reels (2) are connected to a driving motor (3) for outputting yarn; A plurality of hook-leg buffer mechanisms are arranged in the unwinding yarn box (1) and are arranged one-to-one corresponding to the plurality of yarn reels (2); the yarn is drawn out from the yarn reels (2) and wound around the hook-leg buffer mechanisms; the hook-leg buffer mechanisms are used to adjust the tension of the yarn; A gantry frame (4) is rotatably provided with a main shaft along its length, the main shaft being driven to rotate by a main shaft power mechanism (5), and a mold (6) being provided on the main shaft; A movable trolley (7) is slidably connected to the gantry frame (4) along the length direction of the gantry frame (4). A winding nozzle (8) is provided on the movable trolley (7). The winding nozzle (8) corresponds to the mold (6). The yarn is drawn out from the hook leg buffer mechanism, enters the winding nozzle (8) and is wound on the mold (6).

2. The dry winding equipment for monofilament prepreg yarn according to claim 1, characterized in that, Also includes: A measuring sensor (9), wherein a plurality of yarn rolls (2) are arranged in an upper and lower stepped manner, and the measuring sensor (9) is arranged in the unwinding yarn box (1) for detecting the diameter of the yarn roll (2); A control system is communicatively connected to the measurement sensor (9).

3. The dry winding equipment for monofilament prepreg yarn according to claim 2, characterized in that, The leg hook buffer mechanism includes: A cylinder (10) is connected to the unwinding box (1) and is in communication with the control system, and an output end thereof extends downward and is connected to a tensioning guide roller (11); A first guide roller (12) and a second guide roller (13) are respectively arranged on the left and right sides of the tensioning guide roller (11), and the height of the tensioning guide roller (11) is higher than the first guide roller (12) and the second guide roller (13), and the first guide roller (12) is close to the yarn roll (2); After being drawn out from the yarn reel (2), the yarn is sequentially wound around the lower surface of the first guide roller (12), the upper surface of the tensioning guide roller (11) and the lower surface of the second guide roller (13). After being drawn out from the second guide roller (13), the yarn enters the winding nozzle (8).

4. The dry winding equipment for monofilament prepreg yarn according to claim 3, characterized in that Also includes: A first tension sensor (14), a nozzle box (15) is provided on the movable trolley (7), the winding nozzle (8) is provided on the nozzle box (15), the first tension sensor (14) is provided in the nozzle box (15), the yarn is drawn out from the second guide roller (13) and then folded and enters the nozzle box (15), and enters the winding nozzle (8) after the tension is detected by the first tension sensor (14), and the first tension sensor (14) is connected to the control system for communication.

5. The dry winding equipment for monofilament prepreg yarn according to claim 4, characterized in that, Also includes: A BOPP film winding mechanism winds the BOPP film on the mold (6) after the yarn is wound on the mold (6).

6. The dry winding equipment for monofilament prepreg yarn according to claim 5, characterized in that, The BOPP film winding mechanism includes: A BOPP film material roll (16) is arranged on the movable trolley (7) and connected to a magnetic powder brake (17) for outputting the BOPP film material; A secondary tensioning mechanism (18) is provided on the mobile trolley (7) for amplifying the tension of the BOPP film material, and the BOPP film material outputted from the BOPP film material roll (16) is wound around the secondary tensioning mechanism (18); The second tension sensor (19), the BOPP film is led out from the secondary tension increasing mechanism, and after the tension is detected by the second tension sensor (19), it is wound around the mold (6). The magnetic powder brake (17), the second tension sensor (19), the secondary tension increasing mechanism (18) are communicatively connected to the control system.

7. The dry winding device for monofilament prepreg yarn according to claim 6, characterized in that, The secondary tension increasing mechanism (18) includes a plurality of tension amplifiers, the tension amplifiers are driven by a tension magnetic powder controller, the BOPP film is sequentially wound around the plurality of tension amplifiers, and the tension magnetic powder controller is communicatively connected to the control system.

8. The dry winding equipment for monofilament prepreg yarn according to claim 6, characterized in that, A first pneumatic chuck is arranged on the main shaft, the first pneumatic chuck is used for clamping the mold (6), and the center of the main shaft has an inflation structure.

9. The dry winding equipment for monofilament prepreg yarn according to claim 8, characterized in that, A second pneumatic chuck is slidably arranged along the length direction of the gantry frame (4), and the first pneumatic chuck and the second pneumatic chuck jointly clamp the mold (6).

10. Tension control method for dry winding equipment of monofilament prepreg yarn, characterized in that, Applying the monofilament prepreg dry winding equipment according to any one of claims 6-9, comprising the following steps: Set the target tension after yarn doubling to F 总 , the actual tension detected by the first tension sensor (14) is F 检 , the tension generated by resistance and friction is F1, the tension generated by a single yarn bobbin (2) is F2, the number of yarn bobbins (2) is n, the torque generated by the drive motor (3) is T, and the radius of the yarn bobbin (2) is R; F 检 = nF2 + F1; F2 = T / R; Implement detection F through the control system 检 And compare with F 总 When F 检 And F 总 Are different, adjust the torque generated by the drive motor (3) according to the radius of the yarn bobbin (2), and through PID closed-loop control until F 总 And F 检 Are the same or similar.

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