Production process and equipment for improving mechanical property of carbon fiber pultrusion plate

Abstract

The invention relates to the technical field of carbon fiber production, and discloses a production process and equipment for improving the mechanical property of a carbon fiber pultrusion plate, and the production process comprises the following steps: S1, carrying out preheating treatment on carbon fibers; s2, the carbon fibers are guided to a glue tank for glue dipping treatment, the middle of the glue tank is narrowed to concentrate glue, an overflow tank is arranged on the side face of the glue tank, the glue is driven to circulate through a diaphragm pump, and glue pressure and liquid level fluctuation are controlled to be within a preset range; s3, carbon fibers penetrate through gaps of the glue extruding rods, and redundant glue liquid is extruded out; s4, the carbon fiber bundles subjected to gum dipping are subjected to preliminary shaping through a pre-forming mold; s5, the preliminarily-shaped carbon fiber bundles enter a curing forming mold to be subjected to high-temperature curing; and S6, aging treatment is conducted on the carbon fiber plate, and cutting forming is conducted. According to the invention, the accurate regulation and control of the impregnation amount and the impregnation pressure of the carbon fiber are realized, the permeation effect of the glue solution in the carbon fiber bundle is improved, and the mechanical property of the carbon fiber pultrusion plate is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon fiber impregnation, and more particularly to a production process and equipment for improving the mechanical properties of carbon fiber pultruded plates. BACKGROUND

[0002] As a kind of efficient, continuous automatic production process, pultrusion can mass-produce high-performance composite profiles with constant cross-section. The core of carbon fiber pultruded plate production is to impregnate continuous fiber bundle with resin and then accurately cure it in a heated mold. The mechanical properties of carbon fiber plate after forming are directly affected by whether the resin glue can fully penetrate.

[0003] Uniform impregnation ensures that the surface of each carbon fiber filament is fully wrapped in resin, effectively transferring the load from the relatively weak resin matrix to the high-strength carbon fiber, fully utilizing the reinforcing effect of the fiber and directly improving the tensile strength, compressive strength and bending strength of the material. The uniformity of resin and fiber distribution ensures the uniformity of material properties in space, reduces performance fluctuations and improves product quality stability.

[0004] Therefore, it is necessary to propose a production process and equipment for improving the mechanical properties of carbon fiber pultruded plates to at least partially solve the problem of improving the strength of carbon fiber pultruded plates. SUMMARY

[0005] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solution, nor to attempt to determine the protection scope of the claimed technical solution.

[0006] To at least partially solve the above problems, the present application provides a production process for improving the mechanical properties of carbon fiber pultruded plates, comprising:

[0007] S1, preheating treatment of carbon fiber;

[0008] S2, guiding the carbon fiber to the glue tank for impregnation treatment, narrowing the middle part of the glue tank to concentrate the glue and setting overflow grooves on the side, driving the glue circulation by a diaphragm pump, controlling the glue pressure and liquid level fluctuation within a preset range;

[0009] S3, passing the carbon fiber through the gap between the glue extrusion rods to extrude the excess glue;

[0010] S4, the impregnated carbon fiber bundle is preliminarily shaped by a preforming mold;

[0011] S5, the preliminarily shaped carbon fiber bundle enters a high-temperature curing mold for curing;

[0012] S6, aging treatment is carried out to the carbon fiber plate, and cutting is performed.

[0013] Preferably, the glue tank includes a glue tank body and an outer glue tank, the outer glue tank is detachably arranged on the glue tank body and is provided with a circulating flow channel, a diaphragm pump is arranged on the circulating flow channel; the middle part of the outer glue tank is narrowed and recessed downward to form a tapered structure, yarn guide rod groups and extrusion glue rod groups are arranged on the two sides of the outer glue tank, a yarn pressing rod is arranged in the middle part of the outer glue tank and extends into the inner part of the outer glue tank, and the length of the yarn pressing rod is adapted to the width of the narrowed part of the middle part of the outer glue tank.

[0014] Preferably, in S2, a temperature monitoring unit is arranged in the glue dipping process, and the temperature monitoring unit specifically comprises:

[0015] The temperature of the glue solution is detected by the temperature sensor, the controller receives the temperature data and compares the temperature data with a preset glue dipping temperature range, an abnormal situation that the temperature exceeds the preset glue dipping temperature range is identified, and the temperature sensor is installed on a temperature sensor support which is rotationally arranged on the edge of the glue tank body.

[0016] Preferably, in S2, a glue amount control unit is arranged in the glue dipping process, the glue amount control unit controls the glue liquid level by adjusting the power of the diaphragm pump and setting an overflow tank, and the glue amount control unit specifically comprises:

[0017] The circulating flow channel is connected with a glue storage barrel, and the glue storage barrel is used for providing and storing the glue solution;

[0018] A fluid pressure sensor is arranged at the glue outlet end of the circulating flow channel to collect the real-time pressure of the glue solution, the power of the diaphragm pump is reduced or increased when the pressure of the glue solution exceeds or is lower than a preset value, and the pressure fluctuation is controlled to be within 5% of the preset glue solution pressure;

[0019] An overflow tank is arranged at the glue inlet end of the circulating flow channel, the overflow tank is connected to one side of the outer glue tank, and the overflow tank controls the fluctuation range of the glue liquid level to be within 5 mm.

[0020] Preferably, in S2, a tension control unit is arranged in the glue dipping process, the tension control unit includes a pressure sensor and a tension adjusting device, the tension adjusting device is arranged on the glue tank body, the tension adjusting device controls the tension of the carbon fiber according to the detection result of the pressure sensor, and the tension control unit specifically comprises:

[0021] Pressure sensors are arranged at the positions close to the contact positions of the carbon fiber on the yarn guide rod groups, the extrusion glue rod groups and the yarn pressing rod to detect the pressures of the carbon fiber wound on the yarn guide rod groups, the extrusion glue rod groups and the yarn pressing rod, respectively;

[0022] The tension adjusting device drives the yarn pressing rod to act and adjusts the position of the yarn pressing rod, so that the pressure difference of the carbon fiber on the two sides of the yarn guide rod groups and the extrusion glue rod groups is within a preset threshold range.

[0023] Preferably, the tension adjusting device includes:

[0024] Two regulating boxes are symmetrically arranged at the top of both sides of the impregnation tank body;

[0025] An adjusting rod is connected between two adjusting boxes. The adjusting rod has multiple slots evenly arranged along the circumference. The top of both sides of the impregnation tank body is also provided with rod seats for supporting the adjusting rod. The rod seats are located inside the adjusting box. The adjusting rod is rotatably connected to the rod seats.

[0026] Two yarn pressing rod support plates are symmetrically installed on the adjusting rod. The yarn pressing rod support plates are equipped with locking blocks that fit the locking slots. The yarn pressing rods are rotatably connected to the yarn pressing rod support plates.

[0027] Preferably, the regulating box includes:

[0028] Adjust the motor, which is mounted on top of the adjustment box;

[0029] The screw is vertically connected inside the regulating box and connected to the output shaft of the regulating motor;

[0030] The adjusting plate is vertically slidably connected to the inner wall of the adjusting box, and a horizontal sliding groove is provided on the side of the adjusting plate near the adjusting rod.

[0031] A threaded sleeve is installed inside the adjusting plate, and a screw rod passes through the threaded sleeve and is screwed to it.

[0032] The adjusting column is eccentrically connected to the end of the adjusting rod and extends into the adjusting box to slide in a transverse groove.

[0033] Preferably, the tension adjusting device further includes:

[0034] The first gear is connected to the end of the adjusting rod and is configured as an incomplete gear.

[0035] The second gear has its gear shaft mounted on the top of the regulating box via a gear frame, and it meshes with the first gear.

[0036] An angle sensor, mounted on the gear shaft, is used to detect the rotation angle of the second gear.

[0037] Preferably, the regulating box also includes:

[0038] The self-test sleeve is vertically installed inside the adjustment plate, and the top and bottom of the self-test sleeve are symmetrically provided with test grooves, and the bottom of the test groove is provided with a first conductive block.

[0039] The self-checking piece is slidingly connected in the detection groove, and the self-checking piece is directly connected with the bottom of the detection groove with a reset spring, and the bottom end of the self-checking piece is connected with a second conductive block; the first conductive block and the second conductive block are electrically connected with the controller, and the circuit is conducted after the first conductive block and the second conductive block are in contact.

[0040] The self-checking rod is symmetrically arranged at the top end and the bottom end of the adjusting box, and the self-checking rod is coaxially arranged with the self-checking piece, and the top end of the self-checking piece is provided with a self-checking groove matched with the self-checking rod.

[0041] The application provides a production equipment for improving mechanical properties of carbon fiber pultrusion plates, which is applied to the production process and comprises preheating treatment components, glue dipping components, glue extruding components, preforming components, high-temperature curing forming components and plate cutting components arranged in sequence along the process.

[0042] Compared with the prior art, the application has at least the following beneficial effects:

[0043] The production process and equipment for improving mechanical properties of carbon fiber pultrusion plates improve the glue dipping process, narrow the middle part of the glue tank to reduce the volume of the infiltration tank, improve the utilization rate of glue solution, adjust the power of the diaphragm pump to realize accurate control of the glue solution pressure, set an overflow tank to improve the control precision of the glue solution liquid level, avoid the influence of foam on the detection of the glue solution liquid level during the detection by using a liquid level sensor in the glue dipping process, realize accurate regulation and control of the carbon fiber glue dipping amount and the glue dipping pressure, improve the penetration effect of the glue solution in the carbon fiber bundle, and further improve the mechanical properties of the carbon fiber pultrusion plate.

[0044] The production process and equipment for improving mechanical properties of carbon fiber pultrusion plates, other advantages, objects and characteristics of the application will be partially embodied through the following description, and will be partially understood by those skilled in the art through research and practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0045] The accompanying drawings are used to provide a further understanding of the application, and constitute a part of the specification, and are used to explain the application together with embodiments of the application, and do not constitute a limitation on the application. In the drawings:

[0046] Figure 1 The flowchart of the production process for improving mechanical properties of carbon fiber pultrusion plates is provided;

[0047] Figure 2 The control block diagram of the glue dipping process in the application is provided;

[0048] Figure 3 The structural schematic diagram of the glue tank in the application is provided;

[0049] Figure 4 The installation schematic diagram of the yarn pressing rod in the application is provided;

[0050] Figure 5 This is a schematic cross-sectional view of the tension adjustment device in this invention;

[0051] Figure 6 This is a schematic cross-sectional view of the regulating box in this invention;

[0052] Figure 7 This is a schematic diagram of the structure of the end of the adjusting rod in this invention;

[0053] Figure 8 This is a schematic diagram of the self-testing component in this invention;

[0054] Figure 9 This is a physical image of the impregnation process in this invention.

[0055] In the diagram: 1. Dipping tank body; 2. External glue tank; 3. Yarn guide rod assembly; 4. Glue extrusion rod assembly; 5. Yarn pressing rod; 6. Temperature sensor bracket; 7. Glue storage tank; 8. Overflow tank; 10. Rod seat; 11. Adjustment box; 12. Adjustment rod; 13. Yarn pressing rod support plate; 14. Adjustment motor; 15. Screw; 16. Adjustment plate; 17. Transverse slide; 18. Screw sleeve; 19. Adjustment column; 20. Gear frame; 21. First gear; 22. Second gear; 23. Gear shaft; 24. Angle sensor; 25. Self-test sleeve; 26. Detection slot; 27. First conductive block; 28. Self-test component; 29. ​​Reset spring; 30. Second conductive block; 31. Self-test rod; 32. Self-test slot. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0057] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0058] Example 1:

[0059] like Figure 1 As shown, the present invention provides a production process for improving the mechanical properties of carbon fiber pultruded sheets, including:

[0060] S1, preheating treatment of carbon fiber;

[0061] S2, guide the carbon fiber into the glue tank for impregnation. The glue tank narrows in the middle to concentrate the glue liquid and an overflow tank is set on the side. The glue liquid is circulated by a diaphragm pump to control the glue liquid pressure and level fluctuation within a preset range.

[0062] S3, pass the carbon fiber through the gap of the extrusion rod to squeeze out the excess adhesive;

[0063] S4, the resin-impregnated carbon fiber bundles are initially shaped by a preforming mold;

[0064] S5, the initially shaped carbon fiber bundles are placed into a curing mold for high-temperature curing;

[0065] S6 involves aging carbon fiber sheets and then cutting them into shapes.

[0066] The working principle and beneficial effects of the above technical solution are as follows:

[0067] This invention provides a production process for improving the mechanical properties of carbon fiber pultruded sheets. The impregnation process is improved by narrowing the middle of the impregnation tank to reduce its volume and increase the utilization rate of the adhesive. The adhesive is continuously injected into the impregnation tank by a diaphragm pump. When the height of the adhesive in the impregnation tank exceeds the height of the overflow tank, the adhesive overflows through the overflow tank and flows into the storage tank. Then, it is circulated back into the impregnation tank by the diaphragm pump, thus realizing the circulation of the adhesive.

[0068] By adjusting the power of the diaphragm pump, precise control of the adhesive pressure is achieved; by setting an overflow trough, the accuracy of adhesive level control is improved, and the influence of foam on adhesive level detection is avoided when using a level sensor during the impregnation process; precise control of the amount and pressure of adhesive impregnation for carbon fibers is achieved, improving the penetration effect of adhesive in the carbon fiber bundle, thereby enhancing the mechanical properties of the carbon fiber pultruded sheet.

[0069] Example 2:

[0070] like Figure 3 As shown, based on the above embodiment 1, the glue tank includes an impregnation tank body 1 and an outer glue tank 2. The outer glue tank 2 is detachably mounted on the impregnation tank body 1 and is provided with a circulation channel. A diaphragm pump is provided on the circulation channel. The outer glue tank 2 narrows in the middle and is recessed downward to form a conical structure. A yarn guide rod group 3 and a glue extrusion rod group 4 are respectively provided on both sides of the outer glue tank 2. A yarn pressing rod 5 is provided in the middle of the outer glue tank 2 and extends into it. The length of the yarn pressing rod 5 is adapted to the width of the narrowed part in the middle of the outer glue tank 2.

[0071] The working principle and beneficial effects of the above technical solution are as follows:

[0072] The yarn guide rod assembly 3 includes multiple yarn guide rods arranged in a staggered pattern. Fibers bypass the yarn guide rods and enter the outer glue tank 2 at a preset angle under their guidance. The glue extrusion rod assembly 4 includes multiple spaced glue extrusion rods. Fibers pass through the gaps between the extrusion rods, which squeeze out excess glue from the fibers, ensuring uniform glue application and controllable glue volume. The fibers bypass the pressing rod 5 and fully contact the glue in the outer glue tank 2, ensuring sufficient glue depth. The depth of the outer glue tank 2 is less than the depth of the glue tank body 1, effectively reducing the tank volume, decreasing glue consumption, and improving glue utilization.

[0073] Example 3:

[0074] like Figure 2 , Figure 3 As shown, based on the above embodiment 2, in S2, a temperature monitoring unit is set up in the impregnation process, specifically:

[0075] The temperature of the adhesive solution is detected by a temperature sensor. The controller receives the temperature data and compares it with the preset impregnation temperature range to identify abnormal situations where the temperature exceeds the preset impregnation temperature range. The temperature sensor is installed on a temperature sensor bracket 6, which is rotatably positioned at the edge of the impregnation tank body 1.

[0076] The working principle and beneficial effects of the above technical solution are as follows:

[0077] A temperature sensor is mounted on a temperature sensor bracket 6, with its probe inserted into the adhesive solution to continuously collect the current temperature of the solution. The temperature sensor bracket 6 is rotatable, allowing operators to flexibly adjust the position and depth of the temperature sensor as needed, ensuring the representativeness and accuracy of the monitoring points. The temperature sensor transmits the detected temperature data to the controller, which compares it to a preset impregnation temperature range. Temperatures above or below the preset range are considered abnormal, and the controller triggers an alarm to alert personnel for maintenance or manual temperature control. This ensures the impregnation process operates stably under optimal temperature conditions, reducing fiber damage due to temperature runaway and improving the strength of the finished board.

[0078] Example 4:

[0079] like Figure 2 , Figure 3 As shown, based on the above embodiment 2, in S2, a glue volume control unit is set in the glue impregnation process. The glue volume control unit regulates the glue liquid level by adjusting the power of the diaphragm pump and setting the overflow tank 8, specifically:

[0080] The circulation channel is connected to the glue storage tank 7, which is used to supply and store the glue liquid.

[0081] A fluid pressure sensor is installed at the outlet of the circulation channel to collect the real-time pressure of the adhesive. When the adhesive pressure exceeds or falls below the preset value, the power of the diaphragm pump is reduced or increased to control the pressure fluctuation within 5% of the preset adhesive pressure.

[0082] An overflow trough 8 is provided at the glue inlet end of the circulation channel. The overflow trough 8 is connected to one side of the external glue tank 2. The overflow trough 8 controls the fluctuation range of the glue level within 5mm.

[0083] The working principle and beneficial effects of the above technical solution are as follows:

[0084] The circulating flow channel is arranged in the impregnation process. When the glue liquid in the outer glue tank 2 reaches the preset depth, it is overflowed through the overflow tank 8 and then flows back to the glue storage barrel 7 through the glue liquid circulating flow channel, so that the glue liquid in the outer glue tank 2 is sufficient; the diaphragm pump provides power for the glue liquid flow, so that the glue liquid flows back to the outer glue tank 2. A fluid pressure sensor is installed at the glue outlet end (the end of the outer glue tank 2 where the glue liquid enters) of the circulating flow channel, which monitors the pressure of the glue liquid in real time. The control system compares the real-time pressure value read by the sensor with the preset target pressure value. If the real-time pressure exceeds the upper limit of the preset value, the power of the diaphragm pump is reduced, thereby reducing the output flow and pressure of the diaphragm pump; if the real-time pressure is lower than the lower limit of the preset value, the power of the diaphragm pump is increased, thereby increasing the output flow and pressure of the diaphragm pump, and the glue liquid pressure fluctuation is controlled within 5% of the preset glue liquid pressure.

[0085] Through the combination of pressure closed-loop control and liquid level overflow control, the automatic control of the two core parameters of glue liquid pressure and glue tank liquid level in the impregnation process is realized, the accuracy of the glue liquid level and pressure is improved, the consistency of the impregnation state of the fiber bundle at each position in the impregnation process is ensured, and the consistency of the mechanical properties of the finished board at each position is improved.

[0086] Embodiment 5:

[0087] As shown in Figure 2 , Figure 3 , Figure 9 Based on the above embodiment 2, in S2, the impregnation process is provided with a tension control unit, the tension control unit includes a pressure sensor and a tension adjusting device, the tension adjusting device is arranged on the impregnation tank body 1, and the tension adjusting device adjusts and controls the tension of the carbon fiber according to the detection result of the pressure sensor. Specifically:

[0088] A pressure sensor is arranged at the position close to the contact position of the yarn guide rod group 3, the glue extruding rod group 4 and the presser bar 5, which detects the pressure of the carbon fiber wound on the yarn guide rod group 3, the glue extruding rod group 4 and the presser bar 5 respectively.

[0089] The tension adjusting device drives the presser bar 5 to act, adjusts the position of the presser bar 5, and makes the pressure difference of the carbon fiber on both sides of the yarn guide rod group 3 and the glue extruding rod group 4 within the preset threshold range.

[0090] The working principle and beneficial effects of the above technical solution are:

[0091] Pressure sensors are installed at the contact points between the yarn guide rod group 3, the extrusion rod group 4, and the pressing rod 5 and the carbon fiber to detect the contact pressure when the fiber wraps around the rods. The contact pressure is proportional to the fiber tension, thus providing real-time feedback on the tension status. The side of the fiber closer to the yarn guide rod group 3 is the yarn inlet side, and the side closer to the extrusion rod group 4 is the yarn outlet side, separated by the pressing rod 5. When the pressure difference between the two sides exceeds a preset threshold, the tension adjustment device is activated to adjust the position of the pressing rod 5, reducing the pressure difference between the yarn inlet and outlet sides to within the preset threshold. This indicates that the tension on both sides of the fiber is uniform during impregnation, achieving tension balance in the impregnation system. This ensures uniform contact between the adhesive and the fiber filaments, improving the impregnation effect and reducing damage to the fiber from tension fluctuations, preventing fiber breakage or knotting due to unbalanced fiber bundle pressure.

[0092] Example 6:

[0093] like Figures 4-8 As shown, based on the above embodiment 5, the tension adjustment device includes:

[0094] Adjustment box 11, two adjustment boxes 11 are symmetrically arranged at the top of both sides of the impregnation tank body 1;

[0095] An adjusting rod 12 is connected between two adjusting boxes 11. The adjusting rod 12 has multiple slots evenly arranged along the circumference. The top of both sides of the impregnation tank body 1 is also provided with rod seats 10 for supporting the adjusting rod 12. The rod seats 10 are located inside the adjusting box 11. The adjusting rod 12 is rotatably connected to the rod seats 10.

[0096] Two yarn pressing rod support plates 13 are symmetrically installed on the adjusting rod 12. The yarn pressing rod support plates 13 are provided with a locking block that matches the locking slot. The yarn pressing rod 5 is rotatably connected to the yarn pressing rod support plate 13.

[0097] The working principle and beneficial effects of the above technical solution are as follows:

[0098] When the tension adjustment device is in use, a rotary drive assembly is installed inside the adjustment box 11. The output end of the adjustment box 11 drives the adjustment rod 12 to rotate within the rod seat 10, which in turn drives the pressure rod support plate 13 to rotate, adjusting the position of the pressure rod 5 so that it is close to the yarn guide rod assembly 3 or the extrusion rod assembly 4, thereby adjusting the pressure difference on both sides of the fiber bundle to a preset range. The pressure rod support plate 13 and the adjustment rod 12 are connected by a slot and a locking block, and their axial position can be locked, so that the pressure rod support plate 13 rotates synchronously with the adjustment rod 12, resulting in high assembly precision.

[0099] Example 7:

[0100] like Figures 5-8 As shown, based on the above embodiment 6, the regulating box 11 includes:

[0101] Adjusting motor 14, adjusting motor 14 is installed on the top end of adjusting box 11;

[0102] Screw rod 15, screw rod 15 is vertically connected in adjusting box 11 and is connected with the output shaft of adjusting motor 14;

[0103] Adjusting plate 16, adjusting plate 16 is vertically and slidingly connected on the inner wall of adjusting box 11, and the side of adjusting plate 16 close to adjusting rod 12 is provided with transverse sliding groove 17;

[0104] Screw sleeve 18, screw sleeve 18 is installed in adjusting plate 16, and screw rod 15 penetrates screw sleeve 18 and is screwed with screw sleeve 18;

[0105] Adjusting column 19, adjusting column 19 is eccentrically connected on the end of adjusting rod 12, and adjusting column 19 extends into adjusting box 11 and is slidingly connected with transverse sliding groove 17.

[0106] The working principle and beneficial effects of the above technical scheme are as follows:

[0107] When adjusting box 11 is used, adjusting motor 14 is started to make its output shaft rotate forward, drive screw rod 15 to rotate forward, make screw rod 15 and screw sleeve 18 threadedly drive, make screw sleeve 18 move upward, screw sleeve 18 is fixed in adjusting plate 16, and then make adjusting plate 16 move upward, make adjusting column 19 slide in transverse sliding groove 17, because adjusting column 19 is eccentrically arranged, drive adjusting rod 12 to rotate forward, realize the forward rotation driving of adjusting rod 12. Conversely, the output shaft of adjusting motor 14 is reversely rotated, and the reverse rotation driving of adjusting rod 12 can be realized through the above transmission process. By adopting the above transmission mode, adjusting motor 14 does not directly act on adjusting rod 12, the torque in the adjusting process is reduced, and the damage of adjusting motor 14 in the impregnation process is prevented.

[0108] Embodiment 8:

[0109] As shown in the above embodiment 7, the tension adjusting device further comprises: Figures 5-8 First gear 21, first gear 21 is connected on the end of adjusting rod 12, and first gear 21 is arranged as an incomplete gear;

[0110] Second gear 22, gear shaft 23 of second gear 22 is installed on the top end of adjusting box 11 through gear frame 20, and second gear 22 is meshingly connected with first gear 21;

[0111] Angle sensor 24, angle sensor 24 is installed on gear shaft 23 and is used for detecting the rotation angle of second gear 22.

[0112] The working principle and beneficial effects of the above technical scheme are as follows:

[0113]

[0114] ​When the adjusting rod 12 rotates, it drives the first gear 21 to rotate synchronously. The first gear 21 meshes with the second gear 22, causing the second gear 22 and its gear shaft 23 to rotate. The first gear 21 adopts an incomplete gear structure to limit the rotation angle range of the adjusting rod 12. The rotation angle of the gear shaft 23 can be detected by the angle sensor 24, thereby realizing the monitoring of the actual rotation angle of the adjusting rod 12. The gear transmission method has an accurate transmission ratio and a small transmission error. It can accurately detect the rotation angle after gear transmission and feed back the angle detection data to the controller in real time, which plays a role in real-time monitoring of the rotation angle. On the one hand, it prevents structural transmission errors when the adjusting column 19 slides in the transverse slide groove 17, which would lead to inaccurate angle control. On the other hand, it solves the problem of displacement of the yarn pressing rod 5 caused by fiber bundle pressure during the impregnation process. Real-time monitoring helps to compensate for changes in the adjusting angle.

[0115] Example 9:

[0116] like Figures 5-8 As shown, based on the above embodiment 8, the regulating box 11 further includes:

[0117] Self-test sleeve 25, self-test sleeve 25 is vertically set inside adjustment plate 16, and detection grooves 26 are symmetrically arranged at the top and bottom of self-test sleeve 25, and a first conductive block 27 is arranged at the bottom of detection groove 26.

[0118] Self-test component 28 is slidably connected in the detection groove 26, and a reset spring 29 is directly connected to the bottom of the detection groove 26. A second conductive block 30 is connected to the bottom of the self-test component 28. Both the first conductive block 27 and the second conductive block 30 are electrically connected to the controller. The circuit is turned on after the first conductive block 27 and the second conductive block 30 come into contact.

[0119] Two self-testing rods 31 are symmetrically arranged at the top and bottom of the adjustment box 11. The self-testing rods 31 are coaxially arranged with the self-testing component 28. The top of the self-testing component 28 is provided with a self-testing groove 32 that is adapted to the self-testing rods 31.

[0120] The working principle and beneficial effects of the above technical solution are as follows:

[0121] The self-checking assembly is arranged in the adjusting box 11, and when the real-time rotation angle detected by the angle sensor 24 deviates from the set rotation angle by more than a preset range, it indicates that there is an error in the transmission process of the internal components of the adjusting box 11, and the device is stopped and the self-checking assembly is started. During the self-checking process, the adjusting motor 14 is started to drive the screw rod 15 to rotate, and the screw rod 15 is in threaded transmission with the screw sleeve 18, so that the adjusting plate 16 moves in the vertical direction. The adjusting motor 14 first rotates forward and then reverses, so that the adjusting plate 16 first moves upward and then moves downward. When the adjusting plate 16 moves upward, the self-checking rod 31 at the top is inserted into the self-checking groove 32 at the top of the self-checking part 28. The end of the self-checking rod 31 can be provided with an arc surface to guide it to be inserted into the self-checking groove 32. Then, with the movement of the adjusting plate 16, the self-checking rod 31 pushes the self-checking part 28 to slide in the detection groove 26, so that it approaches the bottom of the detection groove 26. When the component transmission deviation is small or does not exist, the first conductive block 27 contacts the second conductive block 30, and the circuit is turned on. The controller receives the electrical signal, indicating that the upward movement position of the adjusting plate 16 is accurate, otherwise no signal is received, indicating that the upward movement position is deviated and needs to be repaired. Similarly, when the adjusting motor 14 reverses to move the adjusting plate 16 downward, the detection method is the same.

[0122] Through the above structural design, when the rotation angle of the adjusting rod 12 deviates, the self-checking program in the adjusting box 11 can be started, and whether the moving position of the adjusting plate 16 is accurate can be judged through the contact state of the conductive block. The deviation of the forward angle adjustment and the reverse angle adjustment in the adjustment process is self-checked, the component deviation state is quickly identified, and the basis for maintenance is provided. In addition, when the deviation is small, the insertion of the self-checking rod 31 and the self-checking part 28 can also realize small-amplitude correction, play the function of deviation self-adjustment, and further ensure that the regulation process is accurate and effective when controlling the fiber tension, and ensure the forming quality and mechanical properties of the carbon fiber plate.

[0123] Embodiment 10:

[0124] A production equipment for improving the mechanical properties of carbon fiber pultruded plates, applied to the production process of any one of embodiments 1-9, comprising a preheating treatment assembly, a gel dipping assembly, an extrusion assembly, a preforming assembly, a high-temperature curing forming assembly and a plate cutting assembly arranged in sequence along the process.

[0125] In the description of the application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0126] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0127] Although the embodiments of the present application have been disclosed as above, it is not limited to the application and implementation listed in the specification and embodiments, and it can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A production process for improving the mechanical properties of carbon fiber pultruded sheets, characterized by, The method comprises the following steps: S1, preheating treatment of carbon fibers; S2, guiding the carbon fibers to the glue tank for impregnation treatment, the middle part of the glue tank is narrowed to concentrate the glue solution, overflow grooves are arranged on the sides, the glue solution is driven to circulate by a diaphragm pump, and the glue solution pressure and liquid level fluctuation are controlled within a preset range; S3, the carbon fibers pass through the gap between the extrusion rods, and the excess glue solution is extruded; S4, the carbon fiber bundle after impregnation is preliminarily shaped by a preforming mold; S5, the preliminarily shaped carbon fiber bundle enters a curing forming mold for high-temperature curing; S6, aging treatment is performed on the carbon fiber plate, and the carbon fiber plate is cut into a desired shape.

2. The production process for improving the mechanical properties of carbon fiber pultruded plates according to claim 1, characterized in that, The glue tank comprises a glue tank body (1) and an outer glue tank (2), the outer glue tank (2) is detachably arranged on the glue tank body (1) and is provided with a circulating flow channel, a diaphragm pump is arranged on the circulating flow channel, the middle part of the outer glue tank (2) is narrowed and is concave downward to form a tapered structure, yarn guide rod groups (3) and extrusion rod groups (4) are arranged on the two sides of the outer glue tank (2), respectively, a yarn pressing rod (5) is arranged in the middle part of the outer glue tank (2) and extends into the inner part of the outer glue tank (2), and the length of the yarn pressing rod (5) is adapted to the width of the narrowed middle part of the outer glue tank (2).

3. The production process for improving the mechanical properties of carbon fiber pultruded plates according to claim 2, characterized in that, In S2, a temperature monitoring unit is arranged in the impregnation process, specifically as follows: The temperature of the glue solution is detected by a temperature sensor, the controller receives the temperature data and compares the temperature data with a preset impregnation temperature range, abnormal conditions that the temperature exceeds the preset impregnation temperature range are identified, the temperature sensor is installed on a temperature sensor support (6), and the temperature sensor support (6) is rotatably arranged on the edge of the glue tank body (1).

4. The production process for improving the mechanical properties of carbon fiber pultruded plates according to claim 2, characterized by, In S2, a glue amount control unit is arranged in the impregnation process, the glue amount control unit adjusts the power of the diaphragm pump and sets an overflow groove (8) to control the glue solution level, specifically as follows: The circulating flow channel is connected with a glue storage barrel (7), and the glue storage barrel (7) is used for providing and storing the glue solution; A fluid pressure sensor is arranged at the glue outlet end of the circulating flow channel to collect the real-time pressure of the glue solution, the power of the diaphragm pump is reduced or increased when the pressure of the glue solution exceeds or is lower than a preset value, and the pressure fluctuation is controlled to be within 5% of the preset glue solution pressure; The overflow groove (8) is arranged at the glue inlet end of the circulating flow channel, the overflow groove (8) is connected to one side of the outer glue tank (2), and the glue solution level fluctuation range is controlled to be within 5 mm.

5. The process of claim 2, wherein the carbon fiber pultruded sheet has a tensile strength of at least 1.5 GPa, an elastic modulus of at least 200 GPa, and an elongation at break of at least 2%. In S2, a tension control unit is arranged in the impregnation process, the tension control unit comprises a pressure sensor and a tension adjusting device, the tension adjusting device is arranged on the glue tank body (1), the tension adjusting device adjusts the tension of the carbon fibers according to the detection result of the pressure sensor, and specifically as follows: Pressure sensors are arranged at the positions where the yarn guide rod groups (3), the extrusion rod groups (4) and the yarn pressing rod (5) contact the carbon fibers to detect the pressures of the carbon fibers wound on the yarn guide rod groups (3), the extrusion rod groups (4) and the yarn pressing rod (5), respectively; The tension adjusting device drives the yarn pressing rod (5) to act and adjusts the position of the yarn pressing rod (5) so that the pressure difference of the carbon fibers on the two sides of the yarn guide rod groups (3) and the extrusion rod groups (4) is within a preset threshold range.

6. The production process for improving the mechanical properties of carbon fiber pultruded sheets according to claim 5, characterized in that, The tension adjusting device comprises: Two adjusting boxes (11) are symmetrically arranged at the top ends of the two sides of the glue tank body (1). The adjusting rod (12) is connected between the two adjusting boxes (11), and the adjusting rod (12) is uniformly provided with a plurality of clamping grooves in the circumferential direction. The impregnation groove body (1) is further provided with a rod seat (10) for supporting the adjusting rod (12) at the top end of the two sides, and the rod seat (10) is located inside the adjusting box (11); the adjusting rod (12) is rotatably connected with the rod seat (10); The presser bar support plate (13) is symmetrically installed on the adjusting rod (12), and the presser bar support plate (13) is provided with a clamping block matched with the clamping groove. The presser bar (5) is rotatably connected to the presser bar support plate (13).

7. The process for improving the mechanical properties of carbon fiber pultruded sheet according to claim 6, characterized in that, The adjusting box (11) comprises: The adjusting motor (14) is installed at the top end of the adjusting box (11); The screw rod (15) is vertically connected in the adjusting box (11) and connected with the output shaft of the adjusting motor (14); The adjusting plate (16) is vertically and slidingly connected to the inner wall of the adjusting box (11), and the side of the adjusting plate (16) close to the adjusting rod (12) is provided with a transverse sliding groove (17); The screw sleeve (18) is installed in the adjusting plate (16), and the screw rod (15) penetrates through the screw sleeve (18) and is screwed therewith; The adjusting column (19) is eccentrically connected to the end of the adjusting rod (12), and the adjusting column (19) extends into the adjusting box (11) and is slidingly connected with the transverse sliding groove (17).

8. The process for improving the mechanical properties of carbon fiber pultruded sheets according to claim 7, characterized in that, The tension adjusting device further comprises: The first gear (21) is connected to the end of the adjusting rod (12), and the first gear (21) is provided as an incomplete gear; The gear shaft (23) of the second gear (22) is installed on the top end of the adjusting box (11) through the gear frame (20), and the second gear (22) is meshingly connected with the first gear (21); The angle sensor (24) is installed on the gear shaft (23) and used for detecting the rotation angle of the second gear (22).

9. The process for improving the mechanical properties of carbon fiber pultruded sheets according to claim 8, characterized in that, The adjusting box (11) further comprises: The self-checking sleeve (25) is vertically arranged in the adjusting plate (16), and detection grooves (26) are symmetrically arranged at the top end and the bottom end of the self-checking sleeve (25). The bottom of the detection groove (26) is provided with a first conductive block (27); The self-checking piece (28) is slidingly connected in the detection groove (26), and the self-checking piece (28) is directly connected with the reset spring (29) at the bottom of the detection groove (26). The bottom end of the self-checking piece (28) is connected with a second conductive block (30); the first conductive block (27) and the second conductive block (30) are electrically connected with the controller, and the circuit is turned on after the first conductive block (27) and the second conductive block (30) are contacted; Two self-checking rods (31) are symmetrically arranged at the top end and the bottom end of the adjusting box (11), and the self-checking rods (31) are coaxially arranged with the self-checking piece (28). The top end of the self-checking piece (28) is provided with a self-checking groove (32) matched with the self-checking rod (31).

10. A production apparatus for improving mechanical properties of a carbon fiber pultrusion sheet, characterized by, The production process of any one of claims 1-9, comprising, in the order of the process, a preheating assembly, a resin impregnation assembly, a resin extrusion assembly, a preforming assembly, a high-temperature curing forming assembly, and a plate cutting assembly.

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