Carbon fiber processing quality detection equipment and detection method

Abstract

The invention relates to the technical field of carbon fiber plate detection, and discloses a carbon fiber processing quality detection device and a detection method.The carbon fiber processing quality detection device comprises a workbench, the upper surface of the workbench is provided with two detection piece bearing assemblies which are used for placing a carbon fiber plate needing to be detected in a side-standing mode, and the two detection piece bearing assemblies are arranged in a mirror image mode; an extrusion unit is arranged on the upper surface of the workbench and located on one side of the two detection piece bearing assemblies and used for extruding the side edge of the carbon fiber plate, and a bending degree detection unit is arranged on the upper surface of the workbench and located on the other side of the two detection piece bearing assemblies and used for detecting the resilience degree of the extruded carbon fiber plate. According to the invention, through the arrangement of the detection piece bearing assembly, a carbon fiber plate to be detected can be placed on the device in a side-standing manner, so that the error of an experiment result caused by the weight of the carbon fiber plate when the carbon fiber plate lies flat is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber plate testing technology, specifically to a carbon fiber processing quality testing device and testing method. Background Technology

[0002] Carbon fiber composites have been widely used in aerospace, rail transportation, high-end sports equipment and new energy fields due to their excellent properties such as high specific strength, high specific modulus, fatigue resistance and strong designability. As a typical structural component, the mechanical properties and geometric accuracy of carbon fiber plates directly determine the quality and reliability of the final product.

[0003] Among them, resilience (i.e. the ability of a material to recover its original shape after elastic deformation) is a key indicator for measuring the internal structural integrity, interlayer bonding quality and residual stress state of carbon fiber sheets.

[0004] The above-mentioned reference comparison file format can be adopted as follows: In existing carbon fiber sheet quality testing, especially for evaluating resilience performance, the carbon fiber sheet is typically laid flat on the equipment and subjected to compression testing from top to bottom when testing its resilience. However, this method has the following problems: 1. Since carbon fiber sheets have a certain weight, their own weight will cause them to bend slightly after bending. This will lead to errors when measuring the degree of bending. Therefore, how to solve the influence of the weight of the carbon fiber sheet on the degree of bending is an urgent problem to be solved.

[0005] 2. When placing the carbon fiber plate on its side, given its thinness and lightness, it is prone to tilting or falling over, which may affect the testing process. Therefore, ensuring that the carbon fiber plate remains stably upright is also a problem to be solved.

[0006] 3. After the carbon fiber sheet is extruded, during the process of the carbon fiber sheet rebounding and maintaining its final state, the carbon fiber sheet will be displaced. It is difficult for the carbon fiber sheet to always remain in the center position, which will lead to inaccurate measurement data and affect the accurate assessment of the rebound performance of the carbon fiber sheet. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a carbon fiber processing quality inspection device and method, mainly to solve the problems of the influence of the carbon fiber sheet's own weight on the curvature measurement, ensuring that the carbon fiber sheet remains stably upright, and how to ensure that the carbon fiber sheet is always centered on the device.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A carbon fiber processing quality inspection device includes a workbench. Two inspection component support assemblies are provided on the upper surface of the workbench for placing the carbon fiber sheet to be inspected on its side. The two inspection component support assemblies are arranged in a mirror image. An extrusion unit is provided on the upper surface of the workbench, located on one side of the two inspection component support assemblies, for extruding the side of the carbon fiber sheet. A bending degree detection unit is provided on the upper surface of the workbench, located on the other side of the two inspection component support assemblies, for detecting the springback of the extruded carbon fiber sheet. A top frame is fixedly connected to the upper surface of the workbench. Contact detection components for detecting the positions of both ends of the carbon fiber sheet are provided on the top frame via a synchronous connecting rod assembly.

[0009] Furthermore, the test piece bearing assembly includes an L-shaped slide that is detachably connected to the upper surface of the workbench by bolts. An extension seat is fixedly connected to one side of the L-shaped slide, and a U-shaped frame with a top opening is fixedly connected to the middle position of the upper surface of the extension seat. A straightening component is provided inside the U-shaped frame to keep the carbon fiber plate in a sideways position within the U-shaped frame.

[0010] Based on the aforementioned scheme, two sets of symmetrical screw holes are provided on both sides of the upper surface of the worktable. Two through holes are provided on the bottom horizontal section of the two L-shaped slides to cooperate with the corresponding two sets of screw holes. Screws are inserted in the through holes, and the bottom end of the screws is threaded into one of the screw holes. Two sets of guide rails are fixedly connected to the upper surface of the worktable to cooperate with the two L-shaped slides respectively, and the guide rails pass through the L-shaped slides and slide in a sliding connection with the L-shaped slides.

[0011] As a further embodiment of the present invention, the straightening assembly includes a rotating roller rotatably connected to the inner wall of the bottom of a U-shaped frame via a bearing seat. Two sliding plates are inserted through and slidably connected to one side wall of the U-shaped frame. A clamping roller that cooperates with the rotating roller is rotatably connected between the ends of the two sliding plates inside the U-shaped frame. A vertical rod is fixedly connected between the two sliding plates inside the U-shaped frame. Multiple springs are fixedly connected between one side of the vertical rod and one side of the inner wall of the U-shaped frame for pushing the clamping roller closer to the rotating roller.

[0012] Furthermore, the extrusion unit includes a fixed base fixedly connected to the upper surface of the workbench. A ball screw module is fixedly connected to one side of the fixed base. A T-shaped extension plate is fixedly connected to one side of the slider of the ball screw module. An extrusion block is fixedly connected to one side of the top of the extension plate. A rubber pad is adhered to the side of the extrusion block near the test piece.

[0013] Based on the aforementioned scheme, the curvature detection unit includes a linear motor module fixedly connected to the upper surface of the workbench. A connecting frame is fixedly connected to the mover of the linear motor module. A cylinder is fixedly connected to one side of the connecting frame. One end of the piston rod of the cylinder passes through the connecting frame and is fixedly connected to an end bracket. A linear displacement sensor is fixedly connected to the upper surface of the end bracket.

[0014] As a further embodiment of the present invention, the synchronous linkage assembly includes strip rods fixedly connected to both sides of the inner wall of the top of the top frame, two sliding rods fixedly connected between opposite sides of the two strip rods, and two transverse frames slidably connected to the two sliding rods via sliding sleeves.

[0015] Furthermore, end seats are fixedly connected to both ends of the upper surface of the top frame, and a bidirectional lead screw is rotatably connected between the two end seats through a bearing seat. The bidirectional lead screw passes through two transverse frames and is threadedly connected to a threaded cylinder on the transverse frame. A self-locking motor that causes the bidirectional lead screw to rotate forward and backward along the axial direction is fixedly connected to one side of one of the end seats.

[0016] Based on the aforementioned scheme, the contact detection assembly includes two contact frames that are fixedly connected to one side of the bottom of the transverse frame, and the two contact frames are located on opposite sides of the two transverse frames. Piezoelectric thin film sensors are installed on the opposite sides of the two contact frames. The two piezoelectric thin film sensors are electrically connected to the self-locking motor. Two warning lights are fixedly connected to the upper surface of the top frame, and the two warning lights are electrically connected to the corresponding piezoelectric thin film sensors.

[0017] A method for inspecting the processing quality of carbon fiber includes the following steps: Step 1: Before testing the carbon fiber sheet, first take out a finished carbon fiber sheet, place it horizontally between the two test component support components, and place it upright between the two test component support components. Step 2: After the carbon fiber plate is placed, the middle part of the carbon fiber plate is horizontally pressed by the extrusion unit. After pressing to the required curvature, stop and wait for the required extrusion time, then restart the extrusion unit to remove the extrusion unit from the carbon fiber plate and return to the initial position. Step 3: After the carbon fiber sheet is extruded, the two ends of the carbon fiber sheet are limited by the synchronous linkage assembly. When both contact detection components on the synchronous linkage assembly are in contact with the two ends of the carbon fiber sheet, the synchronous linkage assembly stops working. Step 4: Then, the bending detection unit sweeps across one side of the bent carbon fiber plate to measure the curvature of the carbon fiber plate and calculate the springback.

[0018] Compared with the prior art, the present invention provides a carbon fiber processing quality inspection device and method, which has the following beneficial effects: 1. The present invention, through the provided detection component support assembly, can place the carbon fiber plate to be tested upright on the device, effectively reducing the error in the experimental results caused by the weight of the carbon fiber plate when it is lying flat.

[0019] 2. The present invention, through the provided straightening component, forms a flexible "clamping area" on both sides of the carbon fiber plate, which overcomes the weight of the carbon fiber plate itself, enabling the carbon fiber plate to maintain a stable vertical state, preventing the plate from tipping over, sliding or shifting during the testing process, and ensuring the safety and repeatability of the testing process.

[0020] 3. Before applying stress and after the rebound stabilization, the present invention uses a synchronous linkage assembly to detect and limit the position of both ends of the carbon fiber plate. In this way, not only can the permanent deformation after rebound be detected, but the carbon fiber plate can also be kept in a centrally symmetrical state at the beginning of the detection stage, which is convenient for subsequent compression of the middle position of the side of the carbon fiber plate.

[0021] 4. The present invention, through the synchronous linkage assembly, can clamp the carbon fiber plate to the centered position before and after stress is applied. In conjunction with the two piezoelectric thin film sensors in the contact detection assembly, it can prevent the contact frame from over-clamping the carbon fiber plate. This not only ensures the stability and accuracy of the carbon fiber plate during the detection process, but also avoids damage to the carbon fiber plate or distortion of test data caused by over-clamping. This makes the entire detection process more reliable and efficient, and provides a strong guarantee for the accurate evaluation of carbon fiber processing quality.

[0022] 5. The L-shaped slide on the workbench of this invention, through the cooperation of guide rails and screw holes, realizes the function of flexibly adjusting the spacing according to the length of carbon fiber board, which can adapt to the detection of carbon fiber boards of various specifications and sizes, effectively improving the utilization rate and application range of the equipment. Attached Figure Description

[0023] Figure 1 This is a front perspective view of a carbon fiber processing quality inspection device proposed in this invention; Figure 2 This invention proposes a carbon fiber processing quality testing device. Figure 1 Rear 3D view; Figure 3 This is a structural diagram of the workbench surface of a carbon fiber processing quality inspection device proposed in this invention; Figure 4 This is a schematic diagram of an L-shaped slide table for a carbon fiber processing quality inspection device proposed in this invention; Figure 5 This is a schematic diagram of the U-shaped frame of a carbon fiber processing quality inspection device proposed in this invention; Figure 6This is a schematic diagram of the extrusion unit of a carbon fiber processing quality inspection device proposed in this invention; Figure 7 This is a schematic diagram of the curvature detection unit of a carbon fiber processing quality inspection device proposed in this invention; Figure 8 This is a structural diagram of a synchronous connecting rod assembly for a carbon fiber processing quality inspection device proposed in this invention. Figure 9 This invention proposes a carbon fiber processing quality inspection device. Figure 8 The bottom structure diagram.

[0024] In the diagram: 1. Workbench; 2. Test piece bearing assembly; 3. Straightening assembly; 4. Extrusion unit; 5. Bending detection unit; 6. Top frame; 7. Synchronous linkage assembly; 8. Contact detection assembly; 201. L-shaped slide; 202. Extension seat; 203. U-shaped frame; 204. Guide rail; 205. Screw hole; 206. Through hole; 301. Rotating roller; 302. Slide plate; 303. Clamping roller; 304. Vertical bar; 305. Spring; 401. Fixed base; 402. Ball screw module; 403. Extension plate frame; 404. Extrusion block; 405. Rubber pad; 501. Linear motor module; 502. Connecting frame; 503. Cylinder; 504. End bracket; 505. Linear displacement sensor; 701. Strip rod; 702. Slide rod; 703. Horizontal sliding frame; 704. End seat; 705. Double-acting lead screw; 706. Self-locking motor; 801. Contact frame; 802. Piezoelectric film sensor; 803. Warning light. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Please see Figures 1-9 As shown, a carbon fiber processing quality inspection device includes a workbench 1. Two inspection component bearing assemblies 2 are provided on the upper surface of the workbench 1 for placing the carbon fiber sheet to be inspected on its side. The two inspection component bearing assemblies 2 are arranged in a mirror image. An extrusion unit 4 is provided on the upper surface of the workbench 1 on one side of the two inspection component bearing assemblies 2 for extruding the side of the carbon fiber sheet. A bending degree inspection unit 5 is provided on the upper surface of the workbench 1 on the other side of the two inspection component bearing assemblies 2 for inspecting the springback of the carbon fiber sheet after extrusion. A top frame 6 is fixedly connected to the upper surface of the workbench 1 by bolts. A contact inspection assembly 8 for inspecting the positions of both ends of the carbon fiber sheet is provided on the top frame 6 through a synchronous connecting rod assembly 7.

[0029] Before testing the carbon fiber plate, take out a finished carbon fiber plate, place it horizontally between the two test piece support components 2, and place it upright between the two test piece support components 2. After the carbon fiber plate is placed, the middle part of the carbon fiber plate is horizontally squeezed by the extrusion unit 4. After the required curvature is reached, the extrusion unit 4 is stopped and the required extrusion time is waited for. Then the extrusion unit 4 is restarted to remove the extrusion unit 4 from the carbon fiber plate and return to the initial position. After the carbon fiber sheet is extruded, the two ends of the carbon fiber sheet are limited by the synchronous linkage assembly 7. When both contact detection components 8 on the synchronous linkage assembly 7 are in contact with the two ends of the carbon fiber sheet, the synchronous linkage assembly 7 stops working. Subsequently, the bending degree detection unit 5 sweeps across one side of the bent carbon fiber plate to measure the curvature of the carbon fiber plate and calculate the springback.

[0030] To facilitate the bearing of the processed carbon fiber sheet, this invention employs a testing component bearing assembly 2 (such as...). Figure 3-4 As shown, it includes an L-shaped slide 201 that is detachably connected to the upper surface of the workbench 1 by bolts. An extension seat 202 is fixedly connected to one side of the L-shaped slide 201 by bolts. A U-shaped frame 203 with a top opening is fixedly connected to the middle position of the upper surface of the extension seat 202 by bolts. A straightening component 3 is provided inside the U-shaped frame 203 to keep the carbon fiber plate in a sideways position inside the U-shaped frame 203.

[0031] The carbon fiber plate to be tested can be placed upright on the device by the provided test component bearing component 2, which effectively reduces the error in the test results caused by the weight of the carbon fiber plate when it is lying flat.

[0032] To adjust the position of the two L-shaped slides 201, two sets of symmetrical screw holes 205 are provided on both sides of the upper surface of the worktable 1. Two through holes 206 are provided on the bottom horizontal section of the two L-shaped slides 201 to cooperate with the corresponding two sets of screw holes 205. Screws are inserted in the through holes 206, and the bottom end of the screw is threaded into one of the screw holes 205. Two sets of guide rails 204 are fixedly connected to the upper surface of the worktable 1 by bolts, which are respectively used to cooperate with the two L-shaped slides 201. The guide rails 204 pass through the L-shaped slides 201 and are slidably connected to the L-shaped slides 201.

[0033] The L-shaped slide 201 on the workbench 1, through the cooperation of the guide rail 204 and the screw hole 205, realizes the function of flexibly adjusting the spacing according to the length of the carbon fiber plate, which can adapt to the inspection of carbon fiber plates of various specifications and sizes, effectively improving the utilization rate and application range of the equipment.

[0034] Before testing, the first step is to adjust the distance between the two L-shaped slides 201 according to the length of the carbon fiber plate to be tested. When adjusting, first loosen the screws that fix the L-shaped slides 201 so that the two L-shaped slides 201 can slide along the guide rail 204. After adjusting to the required spacing, pass the screw through the through hole 206 and screw it into the screw hole 205 of the worktable to complete the positioning and fixing.

[0035] To ensure that the carbon fiber plate remains upright within the U-shaped frame 203, this invention employs a straightening component 3 (such as...). Figure 5(As shown) includes a rotating roller 301 rotatably connected to the inner wall of the bottom of the U-shaped frame 203 via a bearing seat. Two sliding plates 302 are inserted through and slidably connected to one side wall of the U-shaped frame 203. A clamping roller 303, which works in conjunction with the rotating roller 301, is rotatably connected between the ends of the two sliding plates 302 inside the U-shaped frame 203. A vertical rod 304 is fixedly connected between the two sliding plates 302 inside the U-shaped frame 203 by bolts. Multiple springs 305 are welded between one side of the vertical rod 304 and one side of the inner wall of the U-shaped frame 203 for pushing the clamping roller 303 closer to the rotating roller 301.

[0036] The uprighting component 3 forms a flexible "clamping area" on both sides of the carbon fiber plate, which overcomes the weight of the carbon fiber plate itself and enables the carbon fiber plate to maintain a stable vertical state. This prevents the plate from tipping over, sliding or shifting during the testing process, ensuring the safety and repeatability of the testing process.

[0037] After the L-shaped slide table 201 is adjusted, the carbon fiber plate to be tested is placed sideways into the U-shaped frame 203. Before placing it in, the U-shaped part formed by the slide plate 302 and the clamping roller 303 is pulled. At this time, the spring 305 is compressed and the carbon fiber plate is placed sideways between the rotating roller 301 and the U-shaped part. Then, the spring 305 of the U-shaped part is released to release the elastic force and squeeze the carbon fiber plate, so that the carbon fiber plate is stabilized in the sideways position.

[0038] To extrude the carbon fiber sheet, this invention employs an extrusion unit 4 (such as...). Figure 6 As shown, the worktable 1 is fixedly connected to a fixed base 401 by bolts. A ball screw module 402 is fixedly connected to one side of the fixed base 401 by bolts. A T-shaped extension plate frame 403 is fixedly connected to the slider side of the ball screw module 402 by bolts. A pressing block 404 is fixedly connected to the top side of the extension plate frame 403 by bolts. A rubber pad 405 is adhered to the side of the pressing block 404 near the test piece.

[0039] It should be noted that the ball screw module 402 achieves precise linear motion through the coordinated operation of various components: the slide table is the moving part, the ball screw and guide rail form the transmission core, the motor and coupling provide power, and the aluminum alloy profile and support base ensure structural stability. Furthermore, by cooperating with magnetic switches, proximity switches, or photoelectric switches, the displacement of the slide table can be precisely controlled. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0040] Specifically, the ball screw module 402 is activated, driving the extension plate 403 and the extrusion block 404 on the slider to move smoothly towards the center of the side of the carbon fiber plate. The rubber pad 405 at the front end of the extrusion block 404 first contacts the carbon fiber plate. The ball screw module 402 continues to advance, applying a preset displacement to the carbon fiber plate, causing it to bend towards the bending detection unit 5. When the extrusion reaches the preset value, the equipment maintains the required extrusion time. Then, the ball screw module 402 moves in the opposite direction, driving the extrusion block 404 back to the initial position, and the carbon fiber plate begins to rebound freely.

[0041] To detect the curvature of the bent carbon fiber sheet, this invention employs a curvature detection unit 5 (e.g., Figure 7 As shown, the linear motor module 501 is bolted to the upper surface of the worktable 1. A connecting frame 502 is bolted to the mover of the linear motor module 501. A cylinder 503 is bolted to one side of the connecting frame 502. One end of the piston rod of the cylinder 503 passes through the connecting frame 502 and is bolted to an end bracket 504. A linear displacement sensor 505 (model KTR self-resetting displacement sensor) is bolted to the upper surface of the end bracket 504.

[0042] It should be noted that the linear motor module 501 is existing technology, model RXP45 synchronous belt linear module. By controlling the current of the input coil, a moving magnetic field is generated. This moving magnetic field has a "push-pull" effect with the magnetic field of the fixed permanent magnet, thereby directly converting electrical energy into mechanical energy of linear motion. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0043] Specifically, the cylinder 503 extends, which in turn moves the end bracket 504 and the linear displacement sensor 505 toward the carbon fiber plate until the probe of the linear displacement sensor 505 contacts the carbon fiber plate. Then, the linear motor module 501 starts, driving the linear displacement sensor 505 to move at a constant speed along the length of the carbon fiber plate. When the probe of the linear displacement sensor 505 encounters a bend, it retracts. After it has completely traversed the carbon fiber plate, the actual contour curve of the carbon fiber plate after springback is completely recorded.

[0044] It should be noted that cylinder 503 is a power actuator that converts the pressure energy of compressed air into mechanical energy. By controlling the gas inlet and outlet, it drives the piston to perform linear reciprocating motion. It can be used in conjunction with a magnetic switch, proximity switch or photoelectric switch to achieve precise control of the extension and retraction displacement of the piston rod of cylinder 503. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0045] In this invention, the synchronous linkage assembly 7 (such as...) Figure 8-9As shown, the top frame 6 includes two strip rods 701 that are fixedly connected to the inner wall of the top of the top frame 6 by bolts. Two slide rods 702 are fixedly connected between opposite sides of the two strip rods 701 by bolts. Two transverse sliding frames 703 are slidably connected to the two slide rods 702 by sliding sleeves.

[0046] Before stress is applied and after the rebound stabilizes, the positions of both ends of the carbon fiber plate are detected and limited by the synchronous linkage assembly 7. In this way, not only can the permanent deformation after rebound be detected, but the carbon fiber plate can also be kept in a centrally symmetrical state at the beginning of the detection stage, which is convenient for subsequent compression of the middle position of the side of the carbon fiber plate.

[0047] Furthermore, both ends of the upper surface of the top frame 6 are fixedly connected to end seats 704 by bolts. A bidirectional lead screw 705 is rotatably connected between the two end seats 704 through a bearing seat. The bidirectional lead screw 705 passes through two transverse frames 703 and is threadedly connected to the threaded cylinder on the transverse frame 703. A self-locking motor 706 that causes the bidirectional lead screw 705 to rotate forward and backward along the axial direction is fixedly connected to one side of one of the end seats 704 by bolts.

[0048] In this application, the inner wall of the threaded cylinder on the transverse frame 703 is provided with an annular groove, and a nylon 66 damping ring with a Shore hardness of 85A is embedded in the groove. The continuous axial clamping force generated by its elastic deformation forms a helical angle interference fit with the surface of the double-acting screw 705 at 15°-20°. When the threaded pair is subjected to axial vibration load, the nylon insert can generate a maximum elastic compression of 0.3mm, which increases the friction coefficient between the thread contact surfaces from 0.15 to 0.68 (tested according to ASTM D1894 standard), effectively suppressing loosening displacement caused by thread springback.

[0049] It should be noted that the self-locking motor 706 is existing technology. It utilizes the high-precision closed-loop control characteristics of the servo motor system to output a continuous and dynamically adjusted locking torque to the motor to resist the force or torque applied by the external load, thereby achieving the position locking of the motor output shaft. It is an active and intelligent "electrically controlled self-locking". Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0050] Before applying stress, initial reference data of the positions at both ends of the carbon fiber plate is obtained, and the self-locking motor 706 is started to drive the bidirectional lead screw 705 to rotate. Due to the thread characteristics of the bidirectional lead screw 705, the two transverse frames 703 will move synchronously and in opposite directions along the slide bar 702.

[0051] Furthermore, the contact detection assembly 8 includes two contact frames 801 that are fixedly connected to one side of the bottom of the transverse frame 703 by bolts, and the two contact frames 801 are located on opposite sides of the two transverse frames 703. Piezoelectric thin film sensors 802 are installed on opposite sides of the two contact frames 801. The two piezoelectric thin film sensors 802 are electrically connected to the self-locking motor 706. Two warning lights 803 are fixedly connected to the upper surface of the top frame 6 by bolts. The two warning lights 803 are electrically connected to the corresponding piezoelectric thin film sensors 802.

[0052] It should be noted that the piezoelectric thin film sensor 802 is existing technology. The model number of the piezoelectric thin film sensor 802 is LDT0-028K, which belongs to a type of smart sensor. Those skilled in the art can set it according to actual needs, which will not be elaborated here.

[0053] The synchronous linkage assembly 7 can clamp the carbon fiber plate to the center position before and after stress is applied. In conjunction with the two piezoelectric thin film sensors 802 in the contact detection assembly 8, it can prevent the contact frame 801 from over-clamping the carbon fiber plate. This not only ensures the stability and accuracy of the carbon fiber plate during the detection process, but also avoids damage to the carbon fiber plate or distortion of test data caused by over-clamping. This makes the entire detection process more reliable and efficient, and provides a strong guarantee for the accurate evaluation of carbon fiber processing quality.

[0054] When the slide bar 702 moves synchronously and in opposite directions, it will drive the two contact frames 801 below it to move precisely to both ends of the carbon fiber plate. When the piezoelectric film sensor 802 installed inside the contact frame 801 simultaneously contacts both ends of the carbon fiber plate, the self-locking motor 706 stops working. When the piezoelectric film sensor 802 does not contact the carbon fiber plate, the warning light 803 is constantly lit in green. When the piezoelectric film sensor 802 contacts the carbon fiber plate, the warning light 803 is constantly lit in red.

[0055] After the carbon fiber plate springs back freely and maintains its final state, the self-locking motor 706 is restarted. The contact frame 801 is moved by the bidirectional lead screw 705 and the transverse frame 703. When the piezoelectric film sensor 802 installed inside the contact frame 801 contacts both ends of the carbon fiber plate at the same time, the self-locking motor 706 stops working and limits the two ends of the carbon fiber plate.

[0056] The obtained contour data is compared with the standard straight line to calculate the maximum residual bending amount. The springback is calculated using the formula: springback = (1 - residual bending amount / maximum bending deformation amount) × 100%.

[0057] The present invention discloses a method for detecting the processing quality of carbon fiber, which specifically comprises the following steps: S1: Preparatory work before testing. First, adjust the distance between the two L-shaped slides 201 according to the length of the carbon fiber plate to be tested. When adjusting, first loosen the screws that fix the L-shaped slides 201 so that the two L-shaped slides 201 can slide along the guide rail 204. After adjusting to the required spacing, pass the screw through the through hole 206 and screw it into the screw hole 205 of the worktable to complete the positioning and fixing. S2: After the L-shaped slide table 201 is adjusted, the carbon fiber plate to be tested is placed sideways into the U-shaped frame 203. Before placing it in, the U-shaped part formed by the slide plate 302 and the clamping roller 303 is pulled. At this time, the spring 305 is compressed and the carbon fiber plate is placed sideways between the rotating roller 301 and the U-shaped part. Then, the spring 305 of the U-shaped part is released to release the elastic force to squeeze the carbon fiber plate and stabilize the carbon fiber plate in the sideways position. S3: Before applying stress, obtain the initial reference data of the positions at both ends of the carbon fiber plate, start the self-locking motor 706, and drive the bidirectional lead screw 705 to rotate. Due to the thread characteristics of the bidirectional lead screw 705, the two transverse frames 703 will move synchronously and in opposite directions along the slide bar 702, thereby driving the two contact frames 801 below to move precisely to both ends of the carbon fiber plate. When the piezoelectric film sensor 802 installed inside the contact frame 801 simultaneously contacts both ends of the carbon fiber plate, the self-locking motor 706 stops working. When the piezoelectric film sensor 802 does not contact the carbon fiber plate, the warning light 803 is always green. When the piezoelectric film sensor 802 contacts the carbon fiber plate, the warning light 803 is always red. S4: After obtaining the positions of both ends of the carbon fiber plate, force needs to be applied to the carbon fiber plate to produce controllable bending deformation. Start the ball screw module 402 to drive the extension plate frame 403 and the extrusion block 404 on the slider to move smoothly towards the center of the side of the carbon fiber plate. The rubber pad 405 at the front end of the extrusion block 404 first contacts the carbon fiber plate. The ball screw module 402 continues to advance, applying a preset displacement to the carbon fiber plate, causing it to bend in the direction of the bending detection unit 5. When the extrusion reaches the preset value, the equipment maintains the required extrusion time. Then the ball screw module 402 moves in the opposite direction, driving the extrusion block 404 back to the initial position, and the carbon fiber plate begins to spring back freely. S5: After the carbon fiber plate springs back freely and maintains its final state, the self-locking motor 706 is restarted. The contact frame 801 is moved by the bidirectional lead screw 705 and the transverse frame 703. When the piezoelectric film sensor 802 installed inside the contact frame 801 contacts both ends of the carbon fiber plate at the same time, the self-locking motor 706 stops working and limits the two ends of the carbon fiber plate. S6: After limiting both ends of the carbon fiber plate, the cylinder 503 is extended. During the extension process, the end bracket 504 and the linear displacement sensor 505 will move towards the carbon fiber plate until the probe of the linear displacement sensor 505 contacts the carbon fiber plate. Then the linear motor module 501 is started, driving the linear displacement sensor 505 to move at a constant speed along the length of the carbon fiber plate. When the probe of the linear displacement sensor 505 encounters a bending part, it will retract. After the carbon fiber plate has been completely traversed, the actual contour curve of the carbon fiber plate after the rebound is completely recorded. S7: Finally, compare the obtained contour data with the standard straight line to calculate the maximum residual bending amount, and calculate the springback using the formula Springback = (1 - Residual bending amount / Maximum bending deformation) × 100%.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A carbon fiber processing quality detection apparatus comprising a worktable (1), characterized in that, The upper surface of the workbench (1) is provided with two detection component bearing assemblies (2) for placing the carbon fiber plate to be detected in a side-standing manner, and the two detection component bearing assemblies (2) are mirror image arranged, the upper surface of the workbench (1) and located at one side of the two detection component bearing assemblies (2) is provided with an extrusion unit (4) for extruding the side edge of the carbon fiber plate, the upper surface of the workbench (1) and located at the other side of the two detection component bearing assemblies (2) is provided with a bending degree detection unit (5) for detecting the resilience of the extruded carbon fiber plate, the upper surface of the workbench (1) is fixedly connected with a top frame (6), and the top frame (6) is provided with a contact detection assembly (8) for detecting the positions of the two ends of the carbon fiber plate through a synchronous connecting rod assembly (7).

2. The carbon fiber processing quality detection device according to claim 1, wherein The detection component bearing assembly (2) comprises an L-shaped sliding table (201) detachably connected to the upper surface of the workbench (1) through bolts, one side of the L-shaped sliding table (201) is fixedly connected with an extension seat (202), the upper surface of the extension seat (202) is fixedly connected with a U-shaped frame (203) with an open top, and the U-shaped frame (203) is provided with a righting assembly (3) for keeping the carbon fiber plate in a side-standing state in the U-shaped frame (203).

3. The carbon fiber processing quality detection device according to claim 2, wherein Two groups of screw holes (205) are formed in the positions on both sides of the upper surface of the workbench (1), two through holes (206) are formed in the horizontal sections at the bottoms of the two L-shaped sliding tables (201) and used in cooperation with the corresponding two groups of screw holes (205), screws are penetrated through the through holes (206), and the bottom ends of the screws are screw-connected into one of the screw holes (205), and the upper surface of the workbench (1) is fixedly connected with two groups of guide rails (204) used in cooperation with the two L-shaped sliding tables (201), and the guide rails (204) penetrate through the L-shaped sliding tables (201) and are slidingly connected with the L-shaped sliding tables (201).

4. The carbon fiber processing quality detection device according to claim 2, wherein The righting assembly (3) comprises a rotating roller (301) rotatably connected to the inner wall at the bottom of the U-shaped frame (203) through a bearing seat, two sliding plates (302) are penetrated through and slidingly connected with one side wall of the U-shaped frame (203), a clamping roller (303) used in cooperation with the rotating roller (301) is rotatably connected between the end portions of the two sliding plates (302) in the U-shaped frame (203), a vertical rod (304) is fixedly connected between the two sliding plates (302) in the U-shaped frame (203), a plurality of springs (305) are fixedly connected between one side of the vertical rod (304) and one side inner wall of the U-shaped frame (203) and used for pushing the clamping roller (303) to be close to the rotating roller (301).

5. The carbon fiber processing quality detection apparatus according to claim 1, wherein The extrusion unit (4) comprises a fixed base (401) fixedly connected to the upper surface of the workbench (1), a ball screw module (402) is fixedly connected to one side of the fixed base (401), a T-shaped extension plate frame (403) is fixedly connected to one side of the sliding block of the ball screw module (402), an extrusion block (404) is fixedly connected to one side of the top end of the extension plate frame (403), and a rubber pad (405) is bonded to one side of the extrusion block (404) close to the detection component.

6. The carbon fiber processing quality detection apparatus according to claim 5, wherein The bending degree detection unit (5) comprises a linear motor module (501) fixedly connected to the upper surface of the workbench (1), a connecting frame (502) fixedly connected to the mover of the linear motor module (501), a gas cylinder (503) fixedly connected to one side of the connecting frame (502), and an end bracket (504) fixedly connected to the piston rod of the gas cylinder (503) and penetrating through the connecting frame (502), and a linear displacement sensor (505) fixedly connected to the upper surface of the end bracket (504).

7. The carbon fiber processing quality detection apparatus according to claim 1, wherein The synchronous linkage assembly (7) comprises two strip-shaped rods (701) fixedly connected to the inner walls on both sides of the top of the top frame (6), two slide rods (702) fixedly connected between the opposite sides of the two strip-shaped rods (701), and two horizontal moving frames (703) slidably connected to the two slide rods (702) through slide sleeves.

8. The carbon fiber processing quality detection apparatus according to claim 7, wherein The upper surface of the top frame (6) is fixedly connected with two end seats (704) at both ends, a two-way screw rod (705) is rotatably connected between the two end seats (704) through a bearing seat, the two-way screw rod (705) penetrates through the two horizontal moving frames (703) and is threadedly connected with threaded barrels on the horizontal moving frames (703), and one side of one of the end seats (704) is fixedly connected with a self-locking motor (706) for enabling the two-way screw rod (705) to be reversely rotated along the axial direction.

9. The carbon fiber processing quality detection apparatus according to claim 1, wherein The contact detection assembly (8) comprises two contact frames (801) fixedly connected to one side of the bottom of each horizontal moving frame (703), and the two contact frames (801) are located on the opposite sides of the two horizontal moving frames (703), piezoelectric film sensors (802) are mounted on the opposite sides of the two contact frames (801), the two piezoelectric film sensors (802) are electrically connected with the self-locking motor (706), and two warning lights (803) are fixedly connected to the upper surface of the top frame (6) and electrically connected with the corresponding piezoelectric film sensors (802).

10. A method for detecting the processing quality of carbon fibers, which is suitable for the carbon fiber processing quality detection device according to claim 1, characterized in that, The method comprises the following steps: Step one: before detecting the carbon fiber plate, a piece of processed carbon fiber plate is taken out, placed horizontally between the two detection piece bearing assemblies (2), and placed vertically between the two detection piece bearing assemblies (2); Step two: after the carbon fiber plate is placed, the middle position of the carbon fiber plate is horizontally extruded by the extrusion unit (4), the extrusion is stopped after the desired bending degree is reached, the extrusion unit (4) is restarted after the required extrusion time, the extrusion unit (4) is separated from the carbon fiber plate, and returns to the initial position; Step three: after the extrusion of the carbon fiber plate is completed, the two ends of the carbon fiber plate are limited by the synchronous linkage assembly (7), and the synchronous linkage assembly (7) stops working when the two contact detection assemblies (8) on the synchronous linkage assembly (7) are in contact with the two ends of the carbon fiber plate; Step four: then the bending degree detection unit (5) sweeps from one side of the bent carbon fiber plate, measures the bending degree of the carbon fiber plate, and calculates the rebound degree.

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