Carbon fiber preform internal quality detection device and use method thereof

Abstract

The invention discloses a carbon fiber preform internal quality detection device and a use method thereof.The carbon fiber preform internal quality detection device comprises a machine table, a placement table is fixedly connected to the top of the machine table, a carbon fiber preform is placed on the top of the placement table, and a cylinder and an ultrasonic detector are arranged on the top of the machine table; a stretching mechanism, a brushing mechanism, a suction mechanism and a slicking assembly are arranged at the top of the machine table, the brushing mechanism is arranged to drive a cylinder to rotate, so that a rotating ball is extruded, coupling liquid on the inner side of a sliding rod can uniformly flow out from a port of the rotating ball, and the coupling liquid can be uniformly sprayed out from the port of the rotating ball; therefore, the coupling agent can be uniformly coated on the surface of the carbon fiber preform, and can be quickly coated on the surface of the preform in a large area, so that the time for coating the coupling agent is saved, and the working efficiency of pretreatment before detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber materials, in particular to a device for detecting the internal quality of a carbon fiber preform and a method for using the device. Background Art

[0002] A carbon fiber preform is a preform made with carbon fiber as the reinforcement material through textile spinning, web forming, and quasi-3D molding (such as needle punching and braiding). Its core value lies in providing a pre-arranged fiber framework for carbon fiber composite materials (CFRP). It is a key intermediate product in composite material manufacturing. The tensile strength, compressive strength, and flexural strength of a carbon fiber preform directly determine its load-bearing capacity. Internal defects (such as fiber breakage, porosity, and inclusions) can cause stress concentration and significantly reduce material strength. Testing can identify these defects and prevent material failure under extreme conditions. Therefore, specialized equipment is required to test the internal quality of carbon fiber preforms.

[0003] When inspecting a carbon fiber preform, the existing internal quality inspection device for carbon fiber preforms generally first cleans the oil, dust, paint and other impurities on the surface of the carbon fiber product to be inspected to ensure that the surface is flat and smooth to ensure good acoustic coupling between the probe and the inspection surface. Then, a layer of coupling agent is evenly applied to the surface of the carbon fiber preform using a brush or sponge. This treatment method is not only inefficient, but also easily generates bubbles during the application process, thereby affecting the accuracy of the inspection. For this reason, we have designed a carbon fiber preform internal quality inspection device and its use method to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a carbon fiber preform internal quality inspection device and its use method in order to solve the problem that manually applying a layer of coupling agent evenly on the surface of a carbon fiber preform is not only inefficient but also easily generates bubbles during the application process, thereby affecting the accuracy of the inspection.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: A carbon fiber preform internal quality inspection device, comprising: a machine platform, a placing platform fixedly connected to the top of the machine platform, a carbon fiber preform placed on the top of the placing platform, a cylinder and an ultrasonic detector provided on the top of the machine platform, a stretching mechanism, a brushing mechanism, a suction mechanism and a scraping assembly provided on the top of the machine platform; the brushing mechanism comprises a plurality of groups of circular shells arranged on the inner side of the cylinder, each group of the circular shells is provided with a plurality of, a connecting block is fixedly connected between every two of the circular shells, a plurality of second connecting bars are fixedly connected to the inner side of the cylinder, one end of each second connecting bar is fixedly connected to one of the circular shells, a sliding rod is slidably connected to the inner side of each of the circular shells, and each of the sliding rods extends to the outside of the cylinder, a plurality of first circular holes communicating with the inner side of the cylinder are opened on the inner side of the sliding rod, a return spring is installed between the sliding rod and the inner side of the circular shell, and a rotating ball is rotatably connected to one end of the sliding rod.

[0006] As a further solution of the present invention: the stretching mechanism includes two rectangular seats fixedly connected to the top of the machine, a limit bar fixedly connected between the two rectangular seats, two first sliding blocks slidably connected to the outer wall of the limit bar, one end of each of the first sliding blocks is fixedly connected to the first connecting bar, one end of the first connecting bar is fixedly connected to the first fixed plate, and a clamping assembly is provided on the inner side of the first fixed plate.

[0007] As a further solution of the present invention: the clamping assembly includes two second fixing plates fixedly connected to the inner side of the first fixing plate, a limiting rod fixedly connected between the two second fixing plates, and two third connecting plates slidably connected to the outer wall of the limiting rod, one end of the two third connecting plates is fixedly connected to the clamping plate, a fourth drive motor is installed on the top of one second fixing plate, the output end of the fourth drive motor passes through the inner side of the second fixing plate and is fixedly connected to a second bidirectional threaded screw, the outer wall of the second bidirectional threaded screw is respectively provided with a positive thread and a negative thread, and the two third connecting plates are threadedly connected to the positive thread and the negative thread respectively.

[0008] As a further solution of the present invention: the stretching mechanism also includes a first drive motor installed at one end of the rectangular seat, the output end of the first drive motor passes through the inner side of the rectangular seat and is fixedly connected to a first bidirectional threaded screw, the outer wall of the first bidirectional threaded screw is respectively provided with a positive thread and a negative thread, and the two first sliding blocks are respectively threadedly connected to the positive thread and the negative thread.

[0009] As a further solution of the present invention: the brushing mechanism also includes two first connecting seats fixedly connected to the top of the machine, the top of the two first connecting seats is fixedly connected to a first connecting plate, the inner side of the first connecting plate is slidably connected to a second sliding block, the bottom of the second sliding block is fixedly connected to the second connecting seat, the bottom of the second connecting seat is fixedly connected to the second connecting plate, the inner side of the second connecting plate is rotatably connected to a rotating rod, one end of the rotating rod passes through the outside of the second connecting plate and is fixedly connected to the cylinder, a second driving motor is installed on one side of the first connecting plate, the output end of the second driving motor passes through the inner side of the first connecting plate and is fixedly connected to a one-way threaded screw, and the second sliding block is threadedly connected to the outer wall of the one-way threaded screw, and a liquid supply assembly is provided on the top of the cylinder.

[0010] As a further solution of the present invention: the liquid supply assembly includes a fifth fixed plate fixedly connected to one side of the first connecting seat, the top of the fifth fixed plate is fixedly connected to two first fixed seats, the inner sides of the two first fixed seats are rotatably connected to a connecting rod, the outer wall of the connecting rod is fixedly connected to two rotating disks, the inner side of the connecting rod is provided with a liquid supply groove, the outer wall of the first fixed seat is rolled up with a second connecting tube, and the inner side of the second connecting tube is connected to the liquid supply groove, one end of one of the first fixed seats is equipped with a third driving motor, the output end of the third driving motor passes through the other end of the first fixed seat and is fixedly connected to the connecting rod, the connecting rod passes through one end of the other first fixed seat and is rotatably connected to the external liquid supply tube, the first connecting tube is installed at the infusion port of the cylinder, the bottom of the second connecting seat is fixedly connected to a fixed block, the inner side of the fixed block is provided with a circular groove, the liquid outlet of the circular groove is fixedly connected to the first connecting tube, and the liquid supply port of the circular groove is fixedly connected to the second connecting tube.

[0011] As a further solution of the present invention: the scraping assembly includes a connecting strip fixedly connected to the bottom of the fixed block, and the connecting strip is fixedly connected to the ultrasonic detector, and a cleaning rod is fixedly connected to the bottom of the connecting strip, and a first inclined surface is provided at one end of the cleaning rod.

[0012] As a further solution of the present invention: the suction mechanism includes a second fixed seat fixedly connected to the bottom of the second connecting plate, a cavity is opened on the inner side of the second fixed seat, a second inclined surface is provided at one end of the second fixed seat, a plurality of second inclined surfaces communicating with the cavity are opened on the inner side of the second inclined surface, and a third connecting pipe is installed at the liquid suction port of the second inclined surface.

[0013] As a further solution of the present invention: the suction mechanism also includes a third fixed plate fixedly connected to the top of the second fixed seat, one end of the third fixed plate is fixedly connected to a fourth fixed plate, a hydraulic cylinder is installed on the top of the fourth fixed plate, the input end of the hydraulic cylinder passes through the bottom of the fourth fixed plate and is fixedly connected to the third connecting pipe, the top of the third fixed plate is fixedly connected to the fourth fixed plate, a fourth connecting pipe is installed at the liquid inlet of the fourth fixed plate, and the fourth connecting pipe is fixedly connected to the output end of the hydraulic cylinder.

[0014] The present invention also discloses a method for detecting the internal quality of a carbon fiber preform, which uses the above-mentioned carbon fiber preform internal quality detection device, including the following steps: S1 and the fourth drive motor are controlled by a PLC controller, which can control the intermittent start of the fourth drive motor. When the carbon fiber preform needs to be inspected, the staff first places the carbon fiber preform to be inspected on the inspection position on the top of the placement table, and then the PLC controller starts the fourth drive motor. The output end of the fourth drive motor drives the second bidirectional threaded screw to rotate, thereby driving the two third connecting plates to move toward the center position of the first fixed plate, thereby driving the two clamping plates to move toward the center position of the first fixed plate, so as to clamp the carbon fiber preform, thereby realizing automatic clamping of the carbon fiber preform without manual control, thereby improving the working efficiency of the device.

[0015] S2. The first drive motor is controlled by a PLC controller, which can control the intermittent start of the first drive motor. After the clamping plate clamps the carbon fiber preform, the PLC controller controls the first drive motor to start, thereby driving the first bidirectional threaded screw to rotate, thereby driving the two first sliding blocks to move in the direction of the rectangular seat on one side, thereby driving the first connecting bar to move, thereby driving the first fixed plate to move, thereby adaptively stretching the carbon fiber preform, so that the tiny gaps or loose contacts between the fibers inside the carbon fiber preform will be compressed, making the defects such as delamination and debonding and the acoustic impedance difference of the surrounding matrix more obvious, so that when the ultrasonic wave is detected, the reflected signals at the defect, such as the echo amplitude and phase change, will be more prominent, which is convenient for identifying tiny defects, thereby improving the accuracy of detection.

[0016] S3. One end of the connecting rod is connected to the external liquid supply pipe. When the carbon fiber preform is tested, the external liquid supply pipe inputs the coupling liquid into the inner side of the connecting rod, and then flows into the inner side of the cylinder; The second drive motor is controlled by a PLC controller, which can control the intermittent start of the second drive motor. When the clamping plate stretches the carbon fiber preform, the PLC controller controls the start of the second drive motor. The output end of the second drive motor drives the one-way threaded screw to rotate, thereby driving the second sliding block to move from one end of the carbon fiber preform to the other end, thereby driving the second connecting seat to move, thereby driving the cylinder to move, and under the action of the carbon fiber preform, driving the cylinder to rotate, thereby squeezing the rotating ball, so that the coupling liquid on the inside of the sliding rod can flow out evenly from the port of the rotating ball, so that the coupling agent can be evenly coated on the surface of the carbon fiber preform, and at the same time, it can be quickly applied to a large area on the surface of the preform, saving time for applying the coupling agent and improving the work efficiency of pre-processing before detection; At the same time, when encountering workpiece surfaces with different curvature radii, under the action of the return spring, the sliding rod can adaptively slide toward the inside of the return spring, so that the rotating ball can automatically adjust the pressure and contact angle according to the change of curvature, and always maintain a good fit. Whether it is a local area with a larger curvature or a relatively flat part, uniform coupling agent application can be achieved, which makes the brushing device more versatile and adaptable, and can be used for the inspection pre-processing of carbon fiber preforms of various shapes and sizes. The adaptive pressure provided by the spring enables the ball to continuously and stably contact the workpiece surface during the circular motion, ensuring the continuity of the brushing process. At the same time, this uniform pressure also makes the application of the coupling agent smoother.

[0017] The third drive motor is controlled by a PLC controller, which can control the intermittent start of the third drive motor. When the cylinder moves, the PLC controller controls the third drive motor to start, thereby driving the connecting rod to rotate, so as to reel the second connecting tube. As a result, the second connecting tube can be synchronously reeled as the cylinder moves, thereby preventing the second connecting tube from scattering to the top of the carbon fiber preform, thereby affecting the uniformity of the coupling agent application, thereby improving the overall practicality of the device.

[0018] S4. When the cylinder rolls forward to apply the coupling agent, the fixed block can move forward while driving the connecting bar, thereby driving the cleaning rod forward, thereby smoothing the applied coupling agent and spreading it evenly on the workpiece surface, making the coupling agent layer thickness more consistent, thereby optimizing the ultrasonic transmission conditions and improving the accuracy and repeatability of the test results. At the same time, when smoothing the coupling agent, the cleaning rod can squeeze out or break these bubbles, reducing the interference of bubbles on ultrasonic propagation, avoiding signal anomalies caused by bubbles, and making the test results more reliable.

[0019] S5. The hydraulic cylinder is controlled by a PLC controller, which can control the intermittent start of the hydraulic cylinder. When the cleaning rod moves forward to smooth the coupling agent, the PLC controller controls the start of the hydraulic cylinder, thereby driving the hydraulic cylinder to suck the cavity, thereby sucking the outside of the second circular hole, so as to promptly remove the overflowing coupling agent and suck it into the inner side of the liquid storage cylinder for storage to prevent it from flowing to other parts of the workpiece surface. At the same time, it can avoid the formation of stains or residues on the workpiece surface after the coupling agent dries, thereby keeping the workpiece surface clean, which is beneficial to subsequent inspection work and further processing of the workpiece. At the same time, continuous suction can keep the coupling agent around the scraper at a relatively stable amount, avoiding the accumulation of excessive coupling agent affecting the scraping effect of the scraper, helping to improve the overall efficiency of brushing and scraping, and making the preparation process before inspection smoother and more efficient.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a stretching mechanism, the first bidirectional threaded screw is driven to rotate, thereby driving the two first sliding blocks to move respectively in the direction of the rectangular seat on one side, thereby driving the first connecting bar to move, thereby driving the first fixed plate to move, thereby adaptively stretching the carbon fiber preform, so that the small gaps or loose contacts between the fibers inside the carbon fiber preform are compressed, making the defects such as delamination and debonding and the acoustic impedance difference of the surrounding matrix more obvious. Therefore, when ultrasonic testing is performed, the reflected signals at the defects, such as echo amplitude and phase changes, will be more prominent, which facilitates the identification of small defects and improves the accuracy of detection; 2. By setting up a brushing mechanism, the second connecting seat is driven to move, thereby driving the cylinder to move. Under the action of the carbon fiber preform, the cylinder is driven to rotate, thereby squeezing the rotating ball, so that the coupling liquid on the inner side of the sliding rod can flow out evenly from the port of the rotating ball, so that the coupling agent can be evenly coated on the surface of the carbon fiber preform. At the same time, it can be quickly coated on a large area of the preform surface, saving time for applying the coupling agent and improving the work efficiency of the pre-treatment before detection; 3. By providing a return spring, under the action of the return spring, the sliding rod can adaptively slide toward the inside of the return spring, so that the rotating ball can automatically adjust the pressure and contact angle according to the change of curvature, always maintaining a good fit. Whether it is a local area with a large curvature or a relatively flat part, the coupling agent can be evenly applied, which makes the brushing device more versatile and adaptable. It can be used for pre-processing of carbon fiber preforms of various shapes and sizes. The adaptive pressure provided by the spring enables the ball to maintain continuous and stable contact with the workpiece surface during the circular motion, ensuring the continuity of the brushing process. At the same time, this uniform pressure also makes the application of the coupling agent smoother. 4. By setting up a scraping component, the cleaning rod moves forward to smooth the applied coupling agent and spread it evenly on the workpiece surface, making the coupling agent layer thickness more consistent, thereby optimizing the ultrasonic transmission conditions and improving the accuracy and repeatability of the test results. At the same time, when the cleaning rod smoothes the coupling agent, it can squeeze out or break these bubbles, reducing the interference of bubbles on ultrasonic transmission, avoiding signal anomalies caused by bubbles, and making the test results more reliable; 5. By setting up a suction mechanism, the hydraulic cylinder is driven to suck the cavity, thereby sucking the outside of the second circular hole, so that the overflowed coupling agent can be sucked out in time and sucked into the inner side of the liquid storage cylinder for storage to prevent it from flowing to other parts of the workpiece surface. At the same time, it can avoid the coupling agent from forming stains or residues on the workpiece surface after drying, thereby keeping the workpiece surface clean, which is beneficial to subsequent inspection work and further processing of the workpiece. At the same time, continuous suction can keep the coupling agent around the scraper at a relatively stable amount, avoiding the accumulation of excessive coupling agent affecting the scraping effect of the scraper, helping to improve the overall efficiency of brushing and scraping, and making the preparation process before inspection smoother and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the structure of the clamping plate of the present invention; Figure 4 is a cross-sectional view of the stretching mechanism of the present invention; Figure 5 is a cross-sectional view of the coating mechanism of the present invention; Figure 6 It is a schematic diagram of the cylindrical structure of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 It is a schematic structural diagram of the liquid supply component of the present invention; Figure 9 It is a schematic structural diagram of the suction mechanism of the present invention; Figure 10 It is a partial schematic diagram of the suction mechanism of the present invention; Figure 11 It is a cross-sectional view of the suction mechanism of the present invention.

[0022] In the figure: 1, machine table; 2, placing table; 3, carbon fiber preform; 4, rectangular seat; 5, limit bar; 6, first sliding block; 7, first connecting bar; 8, first fixing plate; 9, first bidirectional threaded screw; 10, first driving motor; 11, first connecting seat; 12, first connecting plate; 13, second sliding block; 14, second fixing plate; 15, unidirectional threaded screw; 16, second driving motor; 17, second connecting seat; 18, second connecting plate; 19, rotating rod; 20, cylinder; 21, second connecting bar; 22, round shell; 23, connecting block; 24, sliding rod; 25, return spring; 26, first round hole; 27, rotating ball; 28, first connecting 29. Connecting pipe; 30. Circular groove; 31. Second connecting pipe; 32. First fixing seat; 33. Connecting rod; 34. Rotating disk; 35. Third driving motor; 36. Connecting strip; 37. Cleaning rod; 38. First inclined plane; 39. Ultrasonic detector; 40. Second fixing seat; 41. Cavity; 42. Second inclined plane; 43. Second circular hole; 44. Third connecting pipe; 45. Third fixing plate; 46. Hydraulic cylinder; 47. Fourth connecting pipe; 48. Liquid storage cylinder; 49. Fourth fixing plate; 50. Fifth fixing plate; 51. Third connecting plate; 52. Limiting rod; 53. Clamping plate; 54. Fourth driving motor; 55. Second bidirectional threaded screw. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0025] See also Figures 1 to 11 This embodiment provides a carbon fiber preform internal quality detection device, comprising: Machine 1, the top of the machine 1 is fixedly connected to a placing table 2, a carbon fiber preform 3 is placed on the top of the placing table 2, a cylinder 20 and an ultrasonic detector 39 are provided on the top of the machine 1, and a stretching mechanism, a brushing mechanism, a suction mechanism and a scraping assembly are provided on the top of the machine 1; the stretching mechanism includes two rectangular seats 4 fixedly connected to the top of the machine 1, a limiting strip 5 is fixedly connected between the two rectangular seats 4, and the outer wall of the limiting strip 5 is slidably connected to two first sliding blocks 6, one end of each first sliding block 6 is fixedly connected to a first connecting strip 7, one end of the first connecting strip 7 is fixedly connected to a first fixed plate 8, a clamping assembly is provided on the inner side of the first fixed plate 8, the clamping assembly includes two second fixed plates 14 fixedly connected to the inner side of the first fixed plate 8, a limiting rod 52 is fixedly connected between the two second fixed plates 14, and the limiting rod 52 Two third connecting plates 51 are slidably connected to the outer wall, and one end of the two third connecting plates 51 is fixedly connected to a clamping plate 53. A fourth drive motor 54 is installed on the top of a second fixed plate 14, and the output end of the fourth drive motor 54 passes through the inner side of the second fixed plate 14 and is fixedly connected to a second bidirectional threaded screw 55. The outer wall of the second bidirectional threaded screw 55 is respectively provided with a positive thread and a negative thread. The two third connecting plates 51 are respectively threadedly connected to the positive thread and the negative thread. The stretching mechanism also includes a first drive motor 10 installed at one end of a rectangular seat 4. The output end of the first drive motor 10 passes through the inner side of the rectangular seat 4 and is fixedly connected to a first bidirectional threaded screw 9. The outer wall of the first bidirectional threaded screw 9 is respectively provided with a positive thread and a negative thread, and the two first sliding blocks 6 are respectively threadedly connected to the positive thread and the negative thread.

[0026] The fourth drive motor 54 is controlled by a PLC controller, and the fourth drive motor 54 can be controlled to start intermittently. When the carbon fiber preform 3 needs to be inspected, the staff first places the carbon fiber preform 3 to be inspected on the inspection position on the top of the placement table 2, and then the PLC controller starts the fourth drive motor 54. The output end of the fourth drive motor 54 drives the second bidirectional threaded screw 55 to rotate, thereby driving the two third connecting plates 51 to move toward the center position of the first fixed plate 8, thereby driving the two clamping plates 53 to move toward the center position of the first fixed plate 8, thereby clamping the carbon fiber preform 3, thereby realizing automatic clamping of the carbon fiber preform 3, without the need for manual control, thereby improving the working efficiency of the device; The first drive motor 10 is controlled by a PLC controller, which can control the intermittent start of the first drive motor 10. After the clamping plate 53 clamps the carbon fiber preform 3, the PLC controller controls the first drive motor 10 to start, thereby driving the first bidirectional threaded screw 9 to rotate, thereby driving the two first sliding blocks 6 to move in the direction of the rectangular seat 4 on one side, thereby driving the first connecting bar 7 to move, thereby driving the first fixed plate 8 to move, thereby adaptively stretching the carbon fiber preform 3, so that the tiny gaps or loose contacts between the fibers on the inside of the carbon fiber preform 3 will be compressed, making the defects such as delamination and debonding and the acoustic impedance difference of the surrounding matrix more obvious, so that when the ultrasonic wave is detected, the reflected signals at the defect, such as the echo amplitude and phase change, will be more prominent, which is convenient for identifying tiny defects, thereby improving the accuracy of detection.

[0027] See also Figures 2 to 7The brushing mechanism includes multiple groups of round shells 22 arranged on the inner side of the cylinder 20, each group of round shells 22 is provided with multiple, and a connecting block 23 is fixedly connected between every two round shells 22. A plurality of second connecting strips 21 are fixedly connected to the inner side of the cylinder 20, and one end of each second connecting strip 21 is fixedly connected to a round shell 22. The inner side of each round shell 22 is slidably connected to a sliding rod 24, and each sliding rod 24 passes through the outside of the cylinder 20. A plurality of first circular holes 26 communicating with the inner side of the cylinder 20 are opened on the inner side of the sliding rod 24. A return spring 25 is installed between the sliding rod 24 and the inner side of the round shell 22. One end of the sliding rod 24 rotates The brushing mechanism is rotatably connected to a rotating ball 27. The brushing mechanism also includes two first connecting seats 11 fixedly connected to the top of the machine 1. The tops of the two first connecting seats 11 are fixedly connected to a first connecting plate 12. The inner side of the first connecting plate 12 is slidably connected to a second sliding block 13. The bottom of the second sliding block 13 is fixedly connected to a second connecting seat 17. The bottom of the second connecting seat 17 is fixedly connected to a second connecting plate 18. The inner side of the second connecting plate 18 is rotatably connected to a rotating rod 19. One end of the rotating rod 19 passes through the outside of the second connecting plate 18 and is fixedly connected to the cylinder 20. A second driving motor 16 is installed on one side of the first connecting plate 12. The second driving motor 16 is installed on the other side of the first connecting plate 12. The output end of the motor 16 passes through the inner side of the first connecting plate 12 and is fixedly connected to a one-way threaded screw 15, and the second sliding block 13 is threadedly connected to the outer wall of the one-way threaded screw 15. A liquid supply assembly is provided on the top of the cylinder 20, and the liquid supply assembly includes a fifth fixed plate 50 fixedly connected to one side of the first connecting seat 11. The top of the fifth fixed plate 50 is fixedly connected to two first fixed seats 32. The inner sides of the two first fixed seats 32 are rotatably connected to a connecting rod 33. The outer wall of the connecting rod 33 is fixedly connected to two rotating disks 34. A liquid supply groove is provided on the inner side of the connecting rod 33. The outer wall of the first fixed seat 32 is wound with a second connecting pipe 31, and The inner side of the second connecting tube 31 is connected to the liquid supply tank. A third drive motor 35 is installed at one end of a first fixed base 32. The output end of the third drive motor 35 passes through the other end of the first fixed base 32 and is fixedly connected to a connecting rod 33. The connecting rod 33 passes through one end of another first fixed base 32 and is rotatably connected to the external liquid supply tube. The first connecting tube 28 is installed at the infusion port of the cylinder 20. A fixing block 29 is fixedly connected to the bottom of the second connecting base 17. A circular groove 30 is opened on the inner side of the fixing block 29. The liquid outlet of the circular groove 30 is fixedly connected to the first connecting tube 28, and the liquid supply port of the circular groove 30 is fixedly connected to the second connecting tube 31. One end of the connecting rod 33 is connected to the external liquid supply pipe. When the carbon fiber preform 3 is tested, the external liquid supply pipe inputs the coupling liquid into the inner side of the connecting rod 33, and then flows into the inner side of the cylinder 20. The second drive motor 16 is controlled by a PLC controller, and the second drive motor 16 can be controlled to start intermittently. When the clamping plate 53 stretches the carbon fiber preform 3, the PLC controller controls to start the second drive motor 16. The output end of the second drive motor 16 drives the one-way threaded screw 15 to rotate, thereby driving the second sliding block 13 to move from one end of the carbon fiber preform 3 to the other end, thereby driving the second connecting seat 17 to move, thereby driving the cylinder 20 to move, and under the action of the carbon fiber preform 3, the cylinder 20 is driven to rotate, thereby squeezing the rotating ball 27, so that the coupling liquid on the inside of the sliding rod 24 can flow out evenly from the port of the rotating ball 27, so that the coupling agent can be evenly coated on the surface of the carbon fiber preform 3, and at the same time, it can be quickly applied to a large area on the surface of the preform, saving time for applying the coupling agent and improving the work efficiency of the pre-processing before detection; At the same time, when encountering workpiece surfaces with different curvature radii, under the action of the return spring 25, the sliding rod 24 can adaptively slide toward the inner side of the return spring 25, so that the rotating ball 27 can automatically adjust the pressure and contact angle according to the change of curvature, always maintaining a good fit state. Whether it is a local area with a large curvature or a relatively flat part, the coupling agent can be evenly applied, which makes the brushing device more versatile and adaptable, and can be used for pre-processing of carbon fiber preforms 3 of various shapes and sizes. The adaptive pressure provided by the spring enables the ball to continuously and stably contact the workpiece surface during the circular motion, ensuring the continuity of the brushing process. At the same time, this uniform pressure also makes the application of the coupling agent smoother. The third drive motor 35 is controlled by a PLC controller, and can control the intermittent start of the third drive motor 35. When the cylinder 20 moves, the PLC controller controls the third drive motor 35 to start, thereby driving the connecting rod 33 to rotate, thereby reeling the second connecting tube 31. As a result, the second connecting tube 31 can be synchronously reeled as the cylinder 20 moves, thereby preventing the second connecting tube 31 from scattering to the top of the carbon fiber preform 3, thereby affecting the uniformity of the coupling agent application, thereby improving the overall practicality of the device.

[0028] See also Figures 6 to 11The scraping assembly includes a connecting strip 36 fixedly connected to the bottom of the fixed block 29, and the connecting strip 36 is fixedly connected to the ultrasonic detector 39. The bottom of the connecting strip 36 is fixedly connected to a cleaning rod 37. One end of the cleaning rod 37 is provided with a first inclined surface 38. The suction mechanism includes a second fixed seat 40 fixedly connected to the bottom of the second connecting plate 18. The inner side of the second fixed seat 40 is provided with a cavity 41. One end of the second fixed seat 40 is provided with a second inclined surface 42. The inner side of the second inclined surface 42 is provided with a plurality of second inclined surfaces 42 communicating with the cavity 41. The second inclined surface 42 absorbs liquid A third connecting pipe 44 is installed at the mouth of the suction mechanism, and the suction mechanism also includes a third fixing plate 45 fixedly connected to the top of the second fixing seat 40, one end of the third fixing plate 45 is fixedly connected to the fourth fixing plate 49, and a hydraulic cylinder 46 is installed on the top of the fourth fixing plate 49, and the input end of the hydraulic cylinder 46 passes through the bottom of the fourth fixing plate 49 and is fixedly connected to the third connecting pipe 44, and the top of the third fixing plate 45 is fixedly connected to the fourth fixing plate 49, and a fourth connecting pipe 47 is installed at the liquid inlet of the fourth fixing plate 49, and the fourth connecting pipe 47 is fixedly connected to the output end of the hydraulic cylinder 46.

[0029] When the cylinder 20 rolls forward to apply the coupling agent, the fixed block 29 can simultaneously drive the connecting bar 36 forward, thereby driving the cleaning rod 37 forward, thereby smoothing the applied coupling agent and spreading it evenly on the workpiece surface, making the coupling agent layer thickness more consistent, thereby optimizing the ultrasonic transmission conditions and improving the accuracy and repeatability of the test results. At the same time, when smoothing the coupling agent, the cleaning rod 37 can squeeze out or break these bubbles, reducing the interference of bubbles on ultrasonic propagation, avoiding signal anomalies caused by bubbles, and making the test results more reliable. The hydraulic cylinder 46 is controlled by a PLC controller, which can control the intermittent start of the hydraulic cylinder 46. When the cleaning rod 37 moves forward to smooth the coupling agent, the PLC controller controls the start of the hydraulic cylinder 46, thereby driving the hydraulic cylinder 46 to suck the cavity 41, thereby sucking the outer side of the second circular hole 43, so as to promptly remove the overflowing coupling agent and suck it into the inner side of the liquid storage cylinder 48 for storage to prevent it from flowing to other parts of the workpiece surface. At the same time, it can prevent the coupling agent from forming stains or residues on the workpiece surface after drying, thereby keeping the workpiece surface clean, which is beneficial to subsequent inspection work and further processing of the workpiece. At the same time, continuous suction can keep the coupling agent around the scraper at a relatively stable amount, avoiding the accumulation of excessive coupling agent affecting the scraping effect of the scraper, helping to improve the overall efficiency of brushing and scraping, and making the preparation process before inspection smoother and more efficient. When the cleaning rod 37 moves forward to scrape the coupling agent on the top of the carbon fiber preform 3, the cleaning rod 37 moves while driving the ultrasonic detector 39 to move forward, thereby performing a quality inspection on the top of the carbon fiber preform 3. Since the ultrasonic detector 39 performs internal quality inspection on the carbon fiber preform 3, which is an existing technology, it is not described in detail in this solution.

[0030] In combination with the above-mentioned carbon fiber preform internal quality detection device, a method for detecting the internal quality of a carbon fiber preform is provided below, which specifically includes the following steps: S1 and the fourth drive motor 54 are controlled by a PLC controller, and the fourth drive motor 54 can be controlled to start intermittently. When the carbon fiber preform 3 needs to be inspected, the staff first places the carbon fiber preform 3 to be inspected on the inspection position on the top of the placement table 2, and then the PLC controller starts the fourth drive motor 54. The output end of the fourth drive motor 54 drives the second bidirectional threaded screw 55 to rotate, thereby driving the two third connecting plates 51 to move toward the center position of the first fixed plate 8, thereby driving the two clamping plates 53 to move toward the center position of the first fixed plate 8, so as to clamp the carbon fiber preform 3, thereby realizing automatic clamping of the carbon fiber preform 3 without manual control, thereby improving the working efficiency of the device.

[0031] S2. The first drive motor 10 is controlled by a PLC controller, and the first drive motor 10 can be controlled to start intermittently. After the clamping plate 53 clamps the carbon fiber preform 3, the PLC controller controls the first drive motor 10 to start, thereby driving the first bidirectional threaded screw 9 to rotate, thereby driving the two first sliding blocks 6 to move toward the direction of the rectangular seat 4 on one side, thereby driving the first connecting bar 7 to move, thereby driving the first fixed plate 8 to move, thereby adaptively stretching the carbon fiber preform 3, so that the tiny gaps or loose contacts between the fibers on the inside of the carbon fiber preform 3 will be compressed, making the defects such as delamination and debonding and the acoustic impedance difference of the surrounding matrix more obvious, so that when the ultrasonic wave is detected, the reflected signals at the defect, such as the echo amplitude and phase change, will be more prominent, which is convenient for identifying tiny defects, thereby improving the accuracy of detection.

[0032] S3. One end of the connecting rod 33 is connected to the external liquid supply pipe. When the carbon fiber preform 3 is tested, the external liquid supply pipe inputs the coupling liquid into the inner side of the connecting rod 33, and then flows into the inner side of the cylinder 20. The second drive motor 16 is controlled by a PLC controller, and the second drive motor 16 can be controlled to start intermittently. When the clamping plate 53 stretches the carbon fiber preform 3, the PLC controller controls to start the second drive motor 16. The output end of the second drive motor 16 drives the one-way threaded screw 15 to rotate, thereby driving the second sliding block 13 to move from one end of the carbon fiber preform 3 to the other end, thereby driving the second connecting seat 17 to move, thereby driving the cylinder 20 to move, and under the action of the carbon fiber preform 3, the cylinder 20 is driven to rotate, thereby squeezing the rotating ball 27, so that the coupling liquid on the inside of the sliding rod 24 can flow out evenly from the port of the rotating ball 27, so that the coupling agent can be evenly coated on the surface of the carbon fiber preform 3, and at the same time, it can be quickly applied to a large area on the surface of the preform, saving time for applying the coupling agent and improving the work efficiency of the pre-processing before detection; At the same time, when encountering workpiece surfaces with different curvature radii, under the action of the return spring 25, the sliding rod 24 can adaptively slide toward the inside of the return spring 25, so that the rotating ball 27 can automatically adjust the pressure and contact angle according to the change of curvature, and always maintain a good fit. Whether it is a local area with a larger curvature or a relatively flat part, uniform coupling agent application can be achieved, which makes the brushing device more versatile and adaptable, and can be used for the inspection pre-processing of carbon fiber preforms 3 of various shapes and sizes. The adaptive pressure provided by the spring enables the ball to continuously and stably contact the workpiece surface during the circular motion, ensuring the continuity of the brushing process. At the same time, this uniform pressure also makes the application of the coupling agent smoother.

[0033] The third drive motor 35 is controlled by a PLC controller, and can control the intermittent start of the third drive motor 35. When the cylinder 20 moves, the PLC controller controls the third drive motor 35 to start, thereby driving the connecting rod 33 to rotate, thereby reeling the second connecting tube 31. As a result, the second connecting tube 31 can be synchronously reeled as the cylinder 20 moves, thereby preventing the second connecting tube 31 from scattering to the top of the carbon fiber preform 3, thereby affecting the uniformity of the coupling agent application, thereby improving the overall practicality of the device.

[0034] S4. When the cylinder 20 rolls forward to apply the coupling agent, the fixed block 29 can drive the connecting bar 36 forward while moving forward, thereby driving the cleaning rod 37 forward, thereby smoothing the applied coupling agent and spreading it evenly on the workpiece surface, making the coupling agent layer thickness more consistent, thereby optimizing the ultrasonic transmission conditions and improving the accuracy and repeatability of the test results. At the same time, when smoothing the coupling agent, the cleaning rod 37 can squeeze out or break these bubbles, reducing the interference of bubbles on ultrasonic propagation, avoiding signal anomalies caused by bubbles, and making the test results more reliable.

[0035] S5. The hydraulic cylinder 46 is controlled by a PLC controller, which can control the intermittent start of the hydraulic cylinder 46. When the cleaning rod 37 moves forward to smooth the coupling agent, the PLC controller controls the start of the hydraulic cylinder 46, thereby driving the hydraulic cylinder 46 to suck the cavity 41, thereby sucking the outside of the second circular hole 43, so as to promptly remove the overflowed coupling agent and suck it into the inner side of the liquid storage cylinder 48 for storage to prevent it from flowing to other parts of the workpiece surface. At the same time, it can avoid the formation of stains or residues on the workpiece surface after the coupling agent dries, thereby keeping the workpiece surface clean, which is beneficial to subsequent inspection work and further processing of the workpiece. At the same time, continuous suction can keep the coupling agent around the scraper at a relatively stable amount, avoiding the accumulation of excessive coupling agent affecting the scraping effect of the scraper, helping to improve the overall efficiency of brushing and scraping, and making the preparation process before inspection smoother and more efficient.

[0036] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A carbon fiber preform internal quality detection device, characterized in that: include: A machine (1), wherein the top of the machine (1) is fixedly connected to a placement table (2), a carbon fiber preform (3) is placed on the top of the placement table (2), a cylinder (20) and an ultrasonic detector (39) are provided on the top of the machine (1), and a stretching mechanism, a brushing mechanism, a suction mechanism, and a scraping assembly are provided on the top of the machine (1); The brushing mechanism includes a plurality of groups of circular shells (22) arranged on the inner side of the cylinder (20), each group of the circular shells (22) is provided with a plurality of them, and a connecting block (23) is fixedly connected between every two of the circular shells (22). A plurality of second connecting strips (21) are fixedly connected to the inner side of the cylinder (20), and one end of each second connecting strip (21) is fixedly connected to one of the circular shells (22). The inner side of each of the circular shells (22) is slidably connected to a sliding rod (24), and each of the sliding rods (24) passes through the outside of the cylinder (20). The inner side of the sliding rod (24) is provided with a plurality of first circular holes (26) that communicate with the inner side of the cylinder (20). A reset spring (25) is installed between the sliding rod (24) and the inner side of the circular shell (22), and one end of the sliding rod (24) is rotatably connected to a rotating ball (27).

2. The carbon fiber preform internal quality detection device according to claim 1, characterized in that: The stretching mechanism comprises two rectangular seats (4) fixedly connected to the top of the machine (1), a limit bar (5) fixedly connected between the two rectangular seats (4), two first sliding blocks (6) slidably connected to the outer wall of the limit bar (5), one end of each of the first sliding blocks (6) is fixedly connected to a first connecting bar (7), one end of the first connecting bar (7) is fixedly connected to a first fixed plate (8), and a clamping assembly is provided on the inner side of the first fixed plate (8).

3. The carbon fiber preform internal quality detection device according to claim 2, characterized in that: The clamping assembly comprises two second fixing plates (14) fixedly connected to the inner side of the first fixing plate (8), a limiting rod (52) fixedly connected between the two second fixing plates (14), two third connecting plates (51) slidably connected to the outer wall of the limiting rod (52), one end of each of the two third connecting plates (51) is fixedly connected to a clamping plate (53), a fourth driving motor (54) is installed on the top of one of the second fixing plates (14), the output end of the fourth driving motor (54) passes through the inner side of the second fixing plate (14) and is fixedly connected to a second bidirectional threaded screw (55), a positive thread and a negative thread are respectively provided on the outer wall of the second bidirectional threaded screw (55), and the two third connecting plates (51) are respectively threadedly connected to the positive thread and the negative thread.

4. The carbon fiber preform internal quality detection device according to claim 3, characterized in that: The stretching mechanism further comprises a first drive motor (10) mounted at one end of the rectangular seat (4), the output end of the first drive motor (10) passing through the inner side of the rectangular seat (4) and fixedly connected to a first bidirectional threaded screw rod (9), the outer wall of the first bidirectional threaded screw rod (9) is respectively provided with a positive thread and a negative thread, and the two first sliding blocks (6) are respectively threadedly connected to the positive thread and the negative thread.

5. The carbon fiber preform internal quality detection device according to claim 4, characterized in that: The coating mechanism further comprises two first connecting seats (11) fixedly connected to the top of the machine (1), a first connecting plate (12) fixedly connected to the top of the two first connecting seats (11), a second sliding block (13) slidably connected to the inner side of the first connecting plate (12), a second connecting seat (17) fixedly connected to the bottom of the second sliding block (13), a second connecting seat (17) fixedly connected to the bottom of the second connecting seat (17) fixedly connected to the second connecting plate (18), a rotating rod (19) rotatably connected to the inner side of the second connecting plate (18), one end of the rotating rod (19) passes through the outside of the second connecting plate (18) and is fixedly connected to the cylinder (20), a second driving motor (16) is installed on one side of the first connecting plate (12), an output end of the second driving motor (16) passes through the inner side of the first connecting plate (12) and is fixedly connected to a one-way threaded screw (15), and the second sliding block (13) is threadedly connected to the outer wall of the one-way threaded screw (15), and a liquid supply component is provided on the top of the cylinder (20).

6. The carbon fiber preform internal quality inspection device according to claim 5, characterized in that: The liquid supply assembly comprises a fifth fixed plate (50) fixedly connected to one side of the first connecting seat (11), the top of the fifth fixed plate (50) is fixedly connected to two first fixed seats (32), the inner sides of the two first fixed seats (32) are rotatably connected to a connecting rod (33), the outer wall of the connecting rod (33) is fixedly connected to two rotating disks (34), the inner side of the connecting rod (33) is provided with a liquid supply tank, the outer wall of the first fixed seat (32) is rolled up with a second connecting tube (31), and the inner side of the second connecting tube (31) is communicated with the liquid supply tank, one end of one of the first fixed seats (32) is installed with a third drive motor (35), the The output end of the third drive motor (35) passes through the other end of the first fixing seat (32) and is fixedly connected to the connecting rod (33). The connecting rod (33) passes through one end of the other first fixing seat (32) and is rotatably connected to the external liquid supply pipe. A first connecting pipe (28) is installed at the infusion port of the cylinder (20). A fixing block (29) is fixedly connected to the bottom of the second connecting seat (17). A circular groove (30) is provided on the inner side of the fixing block (29). The liquid outlet of the circular groove (30) is fixedly connected to the first connecting pipe (28), and the liquid supply port of the circular groove (30) is fixedly connected to the second connecting pipe (31).

7. The carbon fiber preform internal quality inspection device according to claim 6, characterized in that: The scraping assembly includes a connecting strip (36) fixedly connected to the bottom of the fixed block (29), and the connecting strip (36) is fixedly connected to the ultrasonic detector (39). A cleaning rod (37) is fixedly connected to the bottom of the connecting strip (36), and a first inclined surface (38) is provided at one end of the cleaning rod (37).

8. The carbon fiber preform internal quality inspection device according to claim 7, characterized in that: The suction mechanism includes a second fixing seat (40) fixedly connected to the bottom of the second connecting plate (18), a cavity (41) is provided on the inner side of the second fixing seat (40), a second inclined surface (42) is provided at one end of the second fixing seat (40), a plurality of second inclined surfaces (42) communicating with the cavity (41) are provided on the inner side of the second inclined surface (42), and a third connecting pipe (44) is installed at the liquid suction port of the second inclined surface (42).

9. The carbon fiber preform internal quality inspection device according to claim 8, characterized in that: The suction mechanism also includes a third fixed plate (45) fixedly connected to the top of the second fixed seat (40), one end of the third fixed plate (45) is fixedly connected to a fourth fixed plate (49), a hydraulic cylinder (46) is installed on the top of the fourth fixed plate (49), the input end of the hydraulic cylinder (46) passes through the bottom of the fourth fixed plate (49) and is fixedly connected to the third connecting pipe (44), the top of the third fixed plate (45) is fixedly connected to the fourth fixed plate (49), a fourth connecting pipe (47) is installed at the liquid inlet of the fourth fixed plate (49), and the fourth connecting pipe (47) is fixedly connected to the output end of the hydraulic cylinder (46).

10. A method for detecting the internal quality of a carbon fiber preform, characterized in that: The carbon fiber preform internal quality detection device according to claim 9 comprises the following steps: S1. When the carbon fiber preform (3) needs to be inspected, the staff first places the carbon fiber preform (3) to be inspected at the inspection position on the top of the placement table (2), and then moves it toward the center position of the first fixed plate (8) through the two third connecting plates (51), thereby driving the two clamping plates (53) to move toward the center position of the first fixed plate (8), thereby clamping the carbon fiber preform (3); S2. After the clamping plate (53) clamps the carbon fiber preform (3), the two first sliding blocks (6) are respectively moved toward the rectangular seat (4) on one side, thereby driving the first connecting bar (7) to move, thereby driving the first fixing plate (8) to move, thereby adaptively stretching the carbon fiber preform (3); S3, by rotating the cylinder (20), the rotating ball (27) is squeezed, so that the coupling liquid inside the sliding rod (24) can flow out evenly from the port of the rotating ball (27), so that the coupling agent can be evenly coated on the surface of the carbon fiber preform (3), and at the same time, a large area of the preform surface can be quickly coated, which saves time for coating the coupling agent and improves the work efficiency of the pre-test processing; Under the action of the return spring (25), the sliding rod (24) can adaptively slide toward the inner side of the return spring (25), so that the rotating ball (27) can automatically adjust the pressure and contact angle according to the change of curvature, and always maintain a good fit state; The second connecting tube (31) is wound up by rotating the connecting rod (33), so that the second connecting tube (31) can be wound up synchronously with the movement of the cylinder (20), thereby preventing the second connecting tube (31) from falling onto the top of the carbon fiber preform (3); S4, by moving the cleaning rod (37) forward, the applied coupling agent is smoothed and evenly spread on the surface of the workpiece, so that the thickness of the coupling agent layer is more consistent; S5. By sucking the outside of the second circular hole (43), the overflowed coupling agent can be sucked out in time and sucked into the inside of the liquid storage cylinder (48) for storage to prevent it from flowing to other parts of the workpiece surface; When the cleaning rod (37) moves forward to scrape the coupling agent on the top of the carbon fiber preform (3), the cleaning rod (37) moves while driving the ultrasonic detector (39) to move forward, thereby performing a quality inspection on the top of the carbon fiber preform (3).

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