A production process and equipment for improving mechanical properties of carbon fiber pultrusion plate

Abstract

The present application relates to the technical field of carbon fiber production, and discloses a production process and equipment for improving the mechanical properties of carbon fiber pultrusion plates, which comprises the following steps: S1, preheating treatment of carbon fiber; S2, guiding the carbon fiber to a glue tank for impregnation treatment, narrowing the middle part of the glue tank to concentrate glue solution, and arranging an overflow groove on the side face, driving the glue solution circulation by a diaphragm pump, and controlling the glue solution pressure and liquid level fluctuation within a preset range; S3, passing the carbon fiber through the gap between extrusion glue rods to squeeze out excess glue solution; S4, primary shaping of the carbon fiber bundle after impregnation by a preforming mold; S5, high-temperature curing of the primary shaped carbon fiber bundle in a curing forming mold; and S6, aging treatment of the carbon fiber plate and cutting into a shape. The present application realizes accurate regulation and control of the impregnation amount and pressure of the carbon fiber, improves the penetration effect of the glue solution in the carbon fiber bundle, and further improves the mechanical properties of the carbon fiber pultrusion plate.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber impregnation technology, and more specifically, to a production process and equipment for improving the mechanical properties of carbon fiber pultruded sheets. Background Technology

[0002] Pultrusion, as a highly efficient, continuous, and automated production process, enables the mass production of high-performance composite profiles with constant cross-sections. The core of carbon fiber pultruded sheet production lies in impregnating continuous fiber bundles with resin and then precisely curing them using a heated mold. The extent to which the resin can fully impregnate the carbon fiber sheet directly affects its mechanical properties after molding.

[0003] Uniform resin impregnation ensures that each carbon fiber monofilament is fully coated with resin, effectively transferring the load from the relatively weak resin matrix to the high-strength carbon fiber. This fully leverages the reinforcing effect of the fiber, directly improving the tensile, compressive, and flexural strength of the material. The uniformity of resin and fiber distribution guarantees the spatial uniformity of material properties, reducing performance fluctuations and improving product quality stability.

[0004] Therefore, it is necessary to propose a production process and equipment to improve the mechanical properties of carbon fiber pultruded sheets, so as to at least partially solve the problem of improving the strength of carbon fiber pultruded sheets. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

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

[0007] S1, preheating treatment of carbon fiber;

[0008] 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.

[0009] S3, pass the carbon fiber through the gap of the extrusion rod to squeeze out the excess adhesive;

[0010] S4, the resin-impregnated carbon fiber bundles are initially shaped by a preforming mold;

[0011] S5, the initially shaped carbon fiber bundles are placed into a curing mold for high-temperature curing;

[0012] S6 involves aging carbon fiber sheets and then cutting them into shapes.

[0013] Preferably, the glue tank includes a glue-dipping tank body and an outer glue tank. The outer glue tank is detachably mounted on the glue-dipping tank body and is provided with a circulation channel. A diaphragm pump is provided on the circulation channel. The outer glue tank narrows in the middle and is recessed downward to form a conical structure. A yarn guide rod group and a glue extrusion rod group are respectively provided on both sides of the outer glue tank. A yarn pressing rod is provided in the middle of the outer glue tank, and the length of the yarn pressing rod is adapted to the width of the narrowed part in the middle of the outer glue tank.

[0014] Preferably, in step S2, a temperature monitoring unit is provided during the impregnation process, specifically:

[0015] 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, which is rotatably positioned at the edge of the impregnation tank body.

[0016] Preferably, in step S2, a glue volume control unit is provided in the glue impregnation process. The glue volume control unit regulates the glue level by adjusting the power of the diaphragm pump and setting an overflow tank. Specifically:

[0017] Connect the circulation channel to the glue storage tank, which is used to supply and store the glue solution.

[0018] 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.

[0019] An overflow trough is installed at the glue inlet end of the circulation channel. The overflow trough is connected to one side of the external glue tank. The overflow trough controls the fluctuation range of the glue level within 5mm.

[0020] Preferably, in step S2, the impregnation process includes a tension control unit, which comprises a pressure sensor and a tension adjustment device. The tension adjustment device is mounted on the impregnation tank body and regulates the carbon fiber tension based on the pressure sensor readings. Specifically:

[0021] Pressure sensors are installed near the carbon fiber contact positions of the yarn guide rod group, the glue extrusion rod group, and the yarn pressing rod to detect the pressure of the carbon fiber winding on the yarn guide rod group, the glue extrusion rod group, and the yarn pressing rod, respectively.

[0022] The tension adjustment device drives the pressure bar to move and adjusts the position of the pressure bar so that the pressure difference between the two sides of the carbon fiber and the guide bar group and the extrusion bar group is within the 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-test component is slidably connected inside the test slot, and a reset spring is directly connected between the self-test component and the bottom of the test slot. A second conductive block is connected to the bottom of the self-test component. Both the first and second conductive blocks are electrically connected to the controller. The circuit is turned on after the first and second conductive blocks come into contact.

[0040] Two self-testing rods are symmetrically arranged at the top and bottom of the adjustment box. The self-testing rods are coaxially arranged with the self-testing component, and the top of the self-testing component is provided with a self-testing groove that is compatible with the self-testing rod.

[0041] This invention provides a production equipment for improving the mechanical properties of carbon fiber pultruded sheets, applied to the production process, including a preheating treatment component, an impregnation component, an extrusion component, a preforming component, a high-temperature curing component, and a sheet cutting component arranged in the process sequence.

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

[0043] This invention provides a production process and equipment for improving the mechanical properties of carbon fiber pultruded sheets. The process improves the impregnation process by narrowing the impregnation tank in the middle to reduce its volume, thus increasing the utilization rate of the impregnating solution. Precise control of the impregnating pressure is achieved by adjusting the power of the diaphragm pump. An overflow tank is added to improve the accuracy of the impregnating solution level control, avoiding the influence of foam on the impregnating solution level detection when using a level sensor during impregnation. This enables precise control of the amount of impregnating carbon fiber and the impregnation pressure, improving the penetration effect of the impregnating solution into the carbon fiber bundle, thereby enhancing the mechanical properties of the carbon fiber pultruded sheet.

[0044] The present invention provides a production process and equipment for improving the mechanical properties of carbon fiber pultruded sheets. Other advantages, objectives and features of the present invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the present invention. Attached Figure Description

[0045] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0046] Figure 1 This is a flowchart of a production process for improving the mechanical properties of carbon fiber pultruded sheets according to the present invention;

[0047] Figure 2 This is a control block diagram of the impregnation process in this invention;

[0048] Figure 3 This is a schematic diagram of the adhesive tank structure in this invention;

[0049] Figure 4 This is a schematic diagram of the installation of the yarn pressing rod in this invention;

[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] A circulation channel is set up during the glue impregnation process. When the glue in the outer glue tank 2 reaches the preset depth, it overflows through the overflow tank 8 and then flows back to the glue storage tank 7 through the glue circulation channel, ensuring that the glue in the outer glue tank 2 is sufficient. A diaphragm pump provides power for the glue flow, causing the glue to flow back to the outer glue tank 2. A fluid pressure sensor is installed at the glue outlet end of the circulation channel (the end where the glue enters the outer glue tank 2) to monitor the glue pressure 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 rate 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 rate and pressure of the diaphragm pump, controlling the glue pressure fluctuation within 5% of the preset glue pressure.

[0085] By combining pressure closed-loop control and liquid level overflow control, the two core parameters of adhesive pressure and adhesive tank level during the impregnation process are automatically controlled, improving the accuracy of adhesive level and pressure, ensuring that the impregnation state of the fiber bundle is consistent at all positions during the impregnation process, and improving the consistency of mechanical properties of the finished board at all positions.

[0086] Example 5:

[0087] like Figure 2 , Figure 3 , Figure 9 As shown, based on the above embodiment 2, in S2, the impregnation process includes a tension control unit, which includes a pressure sensor and a tension adjustment device. The tension adjustment device is installed on the impregnation tank body 1. The tension adjustment device regulates the carbon fiber tension according to the detection result of the pressure sensor, specifically as follows:

[0088] Pressure sensors are installed near the carbon fiber contact positions of the yarn guide rod group 3, the glue extrusion rod group 4, and the yarn pressing rod 5 to detect the pressure of the carbon fiber winding on the yarn guide rod group 3, the glue extrusion rod group 4, and the yarn pressing rod 5, respectively.

[0089] The tension adjustment device drives the yarn pressing rod 5 to move, and adjusts the position of the yarn pressing rod 5 so that the pressure difference between the two sides of the carbon fiber and the yarn guiding rod group 3 and the extrusion rod group 4 is within the preset threshold range.

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

[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] Adjustment motor 14 is installed on the top of adjustment box 11;

[0102] Screw 15 is vertically connected to the regulating box 11 and connected to the output shaft of the regulating motor 14.

[0103] Adjustment plate 16 is vertically slidably connected to the inner wall of adjustment box 11. A transverse sliding groove 17 is provided on the side of adjustment plate 16 near adjustment rod 12.

[0104] Screw sleeve 18 is installed inside the adjusting plate 16, and screw rod 15 passes through screw sleeve 18 and is screwed to it;

[0105] Adjusting column 19 is eccentrically connected to the end of adjusting rod 12 and extends into adjusting box 11 to slide in transverse slide groove 17.

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

[0107] When the adjusting box 11 is in use, the adjusting motor 14 is started, causing its output shaft to rotate forward, which in turn drives the screw 15 to rotate forward. The screw 15 and the screw sleeve 18 are threaded together, causing the screw sleeve 18 to move upward. The screw sleeve 18 is fixed inside the adjusting plate 16, which in turn causes the adjusting plate 16 to move upward, allowing the adjusting column 19 to slide within the transverse slide groove 17. Due to the eccentric setting of the adjusting column 19, the adjusting rod 12 is driven to rotate forward, thus achieving forward rotation drive for the adjusting rod 12. Conversely, starting the adjusting motor 14 causes its output shaft to rotate in the opposite direction. Through the above transmission process, reverse rotation drive for the adjusting rod 12 can be achieved. Using the above transmission method, the adjusting motor 14 does not directly act on the adjusting rod 12, reducing the torque during the adjustment process and preventing damage to the adjusting motor 14 during the impregnation process.

[0108] Example 8:

[0109] like Figures 5-8 As shown, based on the above embodiment 7, the tension adjustment device further includes:

[0110] The first gear 21 is connected to the end of the adjusting rod 12, and the first gear 21 is set as an incomplete gear;

[0111] The second gear 22 has a gear shaft 23 that is mounted on the top of the regulating box 11 via a gear frame 20. The second gear 22 is meshed with the first gear 21.

[0112] Angle sensor 24 is mounted on gear shaft 23 and is used to detect the rotation angle of the second gear 22.

[0113] The working principle and beneficial effects of the above technical solution are as follows:

[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] A self-testing component is installed inside the regulating box 11. When the deviation between the real-time rotation angle detected by the angle sensor 24 and the set rotation angle exceeds the preset range, it indicates that there is an error in the transmission process of the components inside the regulating box 11. The equipment is then stopped and the self-testing component is activated. During the self-test, the regulating motor 14 is started to drive the screw 15 to rotate. The screw 15 and the screw sleeve 18 are connected by a thread, causing the regulating plate 16 to move vertically. The regulating motor 14 first rotates forward and then reverses, causing the regulating plate 16 to move upward and then downward. When the regulating plate 16 moves upward, the self-testing rod 31 above is inserted into the self-testing slot 32 at the top of the self-testing component 28. The end of the self-testing rod 31 can be set as an arc surface to guide its insertion into the self-testing slot 32. Then, as the regulating plate 16 moves, the self-testing rod 31 pushes the self-testing component 28 to slide within the detection slot 26, bringing it closer to the bottom of the detection slot 26. When the component transmission deviation is small or non-existent, the circuit is connected after the first conductive block 27 contacts the second conductive block 30, and the controller receives an electrical signal, indicating that the upward movement of the regulating plate 16 is accurate. Conversely, if no signal is received, it indicates that the upward movement position is off, and maintenance is required. Similarly, when the regulating motor 14 reverses to move the regulating 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-test program in the adjusting box 11 can be activated. By checking the contact status of the conductive block, the accuracy of the movement position of the adjusting plate 16 can be determined. The self-test is performed on the deviation of the forward and reverse angle adjustment during the adjustment process, quickly identifying the deviation status of the components and providing a basis for inspection and maintenance. In addition, when the deviation is small, the insertion of the self-test rod 31 and the self-test component 28 can also achieve a small-amplitude correction, playing a self-adjusting function of deviation. This ensures that the control process is accurate and effective when controlling fiber tension, and guarantees the molding quality and mechanical properties of the carbon fiber sheet.

[0123] Example 10:

[0124] A production equipment for improving the mechanical properties of carbon fiber pultruded sheets, applied to the production process of any one of Examples 1-9, includes a preheating treatment component, an impregnation component, an extrusion component, a preforming component, a high-temperature curing component, and a sheet cutting component arranged in the process sequence.

[0125] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0126] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0127] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A production process for improving the mechanical properties of carbon fiber pultruded sheets, characterized by, The application relates to a carbon fiber plate manufacturing method and device. S1, preheating treatment is conducted on carbon fibers; S2, the carbon fibers are guided to a glue tank for impregnation treatment, the middle part of the glue tank is narrowed to concentrate glue liquid, overflow grooves are arranged on the sides, glue liquid circulation is driven by a diaphragm pump, and glue liquid pressure and liquid level fluctuation are controlled within a preset range; the glue tank comprises a glue tank body (1) and an outer glue tank (2), the middle part of the outer glue tank (2) is narrowed and recessed downward to form a conical structure, yarn guide rod groups (3) and glue extruding rod groups (4) are arranged on the two sides of the outer glue tank (2), and 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); S3, the carbon fibers pass through the gap between the glue extruding rod groups (4), and the excess glue liquid is squeezed out; S4, the carbon fiber bundle after impregnation treatment is preliminarily shaped in a preforming mold; S5, the preliminarily shaped carbon fiber bundle enters a curing forming mold for high-temperature curing; S6, the carbon fiber plate is subjected to aging treatment, and is cut into a shape. In S2, the impregnation treatment process is provided with a tension control unit, the tension control unit comprises a pressure sensor and a tension adjusting device, the pressure sensor is used for detecting the pressure of the carbon fibers wound on the yarn guide rod groups (3), the glue extruding rod groups (4) and the yarn pressing rod (5), and the tension adjusting device adjusts the position of the yarn pressing rod (5) to make the pressure difference of the carbon fibers on the two sides of the yarn guide rod groups (3) and the glue extruding rod groups (4) within a preset threshold range. The tension adjusting device comprises adjusting boxes (11), adjusting rods (12) and yarn pressing rod support plates (13), the 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), the two yarn pressing rod support plates (13) are symmetrically mounted on the adjusting rod (12), and the yarn pressing rod (5) is rotatably connected to the yarn pressing rod support plates (13). The adjusting box (11) comprises an adjusting motor (14), a screw rod (15), an adjusting plate (16), a screw sleeve (18) and an adjusting column (19), the adjusting motor (14) is mounted at the top end of the adjusting box (11), the screw rod (15) is connected with the output shaft of the adjusting motor (14), the adjusting plate (16) is vertically and slidably connected to the inner wall of the adjusting box (11) and is provided with a transverse sliding groove (17) on the side close to the adjusting rod (12), the screw sleeve (18) is mounted in the adjusting plate (16) and is screwed with the screw rod (15), and the adjusting column (19) is eccentrically connected to the end of the adjusting rod (12) and extends into the adjusting box (11) and is slidably connected with the transverse sliding groove (17).

2. The production process for improving the mechanical properties of carbon fiber pultruded plates according to claim 1, characterized in that, The outer glue tank (2) is detachably arranged on the glue tank body (1) and is provided with a circulating flow channel, the diaphragm pump is arranged on the circulating flow channel, and the length of the yarn pressing rod (5) is adaptively arranged with the width of the narrowed part in the 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 treatment process, and the temperature monitoring unit comprises: A temperature sensor is arranged 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, the impregnation process sets a glue amount control unit, the glue amount control unit controls the glue liquid level by adjusting the power of the diaphragm pump and setting the overflow tank (8), specifically: The circulating flow channel is connected with the glue storage barrel (7), and the glue storage barrel (7) is used for providing and storing glue liquid; A fluid pressure sensor is arranged at the glue outlet end of the circulating flow channel, and the real-time pressure of the glue liquid is collected. When the pressure of the glue liquid is higher or lower than the preset value, the power of the diaphragm pump is reduced or increased, and the pressure fluctuation is controlled within 5% of the preset glue liquid pressure; An overflow tank (8) is arranged at the glue inlet end of the circulating flow channel, and the overflow tank (8) is connected to one side of the external glue tank (2). The overflow tank (8) controls the fluctuation range of the glue liquid level within 5mm.

5. The production process for improving the mechanical properties of carbon fiber pultruded sheets according to claim 1, characterized in that, The adjusting rod (12) is uniformly provided with a plurality of clamping grooves in the circumferential direction. The two sides of the impregnation tank body (1) are 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 with the rod seat (10). The yarn pressing rod support plate (13) is provided with a clamping block matched with the clamping groove.

6. The process for improving the mechanical properties of carbon fiber pultruded sheet according to claim 1, characterized in that, The tension adjusting device further comprises: A first gear (21) connected to the end of the adjusting rod (12), the first gear (21) is set as an incomplete gear; A second gear (22) whose gear shaft (23) is installed at the top end of the adjusting box (11) through a gear frame (20), the second gear (22) is meshingly connected with the first gear (21); An angle sensor (24) installed on the gear shaft (23) for detecting the rotation angle of the second gear (22).

7. The process for improving the mechanical properties of carbon fiber pultruded sheet according to claim 6, characterized in that, The adjusting box (11) further comprises: A self-checking sleeve (25) vertically arranged in the adjusting plate (16), and detection grooves (26) symmetrically arranged at the top end and the bottom end of the self-checking sleeve (25), and a first conductive block (27) arranged at the bottom of the detection groove (26); A self-checking piece (28) slidably connected in the detection groove (26), and a reset spring (29) directly connected between the self-checking piece (28) and the bottom of the detection groove (26), and a second conductive block (30) connected to the bottom end of the self-checking piece (28); 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 in contact; Two self-checking rods (31) symmetrically arranged at the top end and the bottom end of the adjusting box (11), the self-checking rods (31) are coaxially arranged with the self-checking piece (28), and the self-checking piece (28) is provided with a self-checking groove (32) matched with the self-checking rod (31).

8. A production apparatus for improving mechanical properties of a carbon fiber pultrusion sheet, characterized by, The production process of any one of claims 1-7, comprising a preheating treatment assembly, an impregnation assembly, an extrusion assembly, a preforming assembly, a high-temperature curing forming assembly and a plate cutting assembly arranged in sequence along the process.

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