A defect detection device for carbon fiber precursor

Abstract

The application discloses a kind of for carbon fiber precursor's defect detection device, it is related to carbon fiber quality detection equipment field, including defect detection mechanism, the inside of defect detection mechanism is equipped with precursor amplification mechanism, carbon fiber precursor is inserted in the inside of precursor amplification mechanism, the back of precursor amplification mechanism is equipped with rack fixing seat B, first convex mirror is provided on precursor amplification mechanism, second convex mirror is installed in the side of first convex mirror, third convex mirror is provided in the side of second convex mirror away from first convex mirror, fourth convex mirror is installed in the side of third convex mirror away from second convex mirror;Visual defect detector is provided on defect detection mechanism.The used for carbon fiber precursor's defect detection device, precursor amplification mechanism can amplify detection surface, so that visual defect detector can more clearly observe the subtle features and potential defects on the surface of carbon fiber precursor, improve production efficiency, by multidirectional detection to precursor, improve detection accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of carbon fiber quality detection equipment, in particular to a defect detection device for carbon fiber precursor. BACKGROUND

[0002] Carbon fiber in the production process is mainly divided into two stages, the precursor stage and the carbonization stage, during the precursor stage process, if the fiber yarn overlaps, the spinneret drops the paste, the ceramic eye is damaged, etc., it will cause the precursor to have hair, hair ball and other defects, thereby affecting the carbonization stage, the size of the hair and hair ball is different, which is difficult to observe with the naked eye, and because the speed of the precursor fiber in the production process can reach nearly 400 meters per minute, the production personnel cannot immediately find the hair and process it, which seriously affects the product performance, in order to timely find the hair and hair ball of the precursor, it is necessary to monitor each bundle of precursor in real time; at present, the domestic carbon fiber precursor hair detection device generally uses a high-speed camera to detect the high-speed running precursor under the light source in real time, and then processes the data through a computer image processing and control system, and displays the number of hair on the display and alarms; this detection device can indeed achieve the purpose of real-time monitoring of high-speed running precursor, but in the actual production process, due to the fast line speed, slight vibration will cause large-scale deviation of the entire bundle, at this time the fixed camera cannot capture the deviated bundle; in addition, if the hair of the bundle is too large or the yarn is broken, the precursor will be wound on the driving roller to form a tangled yarn, and the surface of the fiber will be covered layer by layer, so that the hair cannot be found, at this time the above hair detection device fails and cannot alarm the hair and tangled yarn, thereby affecting the production.

[0003] In order to solve the above problems, through retrieval, the Chinese patent with publication number CN218212694U discloses a bidirectional high-precision carbon fiber precursor defect detection device, in the process of high-speed running of the carbon fiber precursor, the hair with hair, hair ball and other defects passes through the rolling shaft of the driving roller 5, and the hair is highlighted due to the illumination of the light source device, and then is captured by the high-frame-rate image capture device, after the image is captured, the alarm is triggered, the on-duty personnel should arrive in time, the staff processes according to the actual situation, when the hair and hair ball are too large to cause yarn breakage and tangling, because the hair on the surface of the precursor is covered layer by layer, the image capture device cannot judge and capture the precursor, at this time the tangled yarn detection device will judge whether the yarn is tangled according to the feedback information of the laser shot (the detection and judgment method belongs to the known method in the art, which is not repeated here), thereby alarming.

[0004] The device can detect the carbon fiber precursor, but can only detect the defects of the wire bundle opposite to the camera of the image capturing device in actual use, and has a blind area. Since there is a blind area, the overall carbon fiber wire cannot be comprehensively detected, and defects such as cracks, holes, impurities and the like on the side and back of the wire may be missed, the detection accuracy and reliability are reduced, the overall quality of the product cannot be guaranteed, and the carbon fiber wire cannot be comprehensively detected. SUMMARY

[0005] The present application aims to provide a defect detection device for carbon fiber precursor to solve the defects mentioned in the background.

[0006] To achieve the above-mentioned purpose, a defect detection device for carbon fiber precursor is provided, which comprises a defect detection mechanism, an original wire magnification mechanism is installed on the inner side of the defect detection mechanism, carbon fiber precursors are inserted into the original wire magnification mechanism, a rack fixing seat B is installed on the back of the original wire magnification mechanism, a first convex mirror is provided on the original wire magnification mechanism, a second convex mirror is installed on one side of the first convex mirror, a third convex mirror is provided on the side away from the second convex mirror of the second convex mirror, and a fourth convex mirror is installed on the side away from the second convex mirror of the third convex mirror; a visual defect detector is provided on the defect detection mechanism, an installation seat is provided at the bottom of the visual defect detector, and a positioning frame is installed at the bottom of the installation seat.

[0007] Further, the original wire magnification mechanism comprises a first convex mirror, a second convex mirror, a third convex mirror, a fourth convex mirror, a butt joint seat, a support frame, a positioning frame and a detection hole; the first convex mirror, the second convex mirror, the third convex mirror and the fourth convex mirror are centrally symmetric structures about the carbon fiber precursor.

[0008] Further, the two adjacent groups of convex mirrors are fixedly connected through the butt joint seats, the cross section of the butt joint seat is in the shape of a dovetail, and a splicing groove is formed in each of the four butt joint seats, a splicing strip is inserted into the splicing groove, the splicing strip and the splicing groove are in the shape of an isosceles trapezoid, the splicing strip is fixed in the splicing groove through bolts, and a support frame is fixedly arranged on the outer side of each of the four splicing strips.

[0009] Further, the end portions of the four support frames are fixed to the circumferential inner wall of the positioning frame, the positioning frame is an annular structure made of metal, four detection holes are uniformly formed in the circumferential outer wall of the positioning frame, and the four detection holes are circular.

[0010] Further, the visual defect detectors are inserted into the four detection holes, and the four visual defect detectors are arranged opposite to the first convex mirror, the second convex mirror, the third convex mirror and the fourth convex mirror respectively; the first convex mirror, the second convex mirror, the third convex mirror and the fourth convex mirror are combined to form a cylindrical magnifying lens, and the axial cross section of the magnifying lens, the positioning frame and the carbon fiber precursor is a concentric circle structure.

[0011] Further, the defect detection mechanism comprises a mounting seat, visual defect detectors, passive columns, passive slots, a driving disc, guide seats, guide rails, rack fixing seats A, an external gear and a driving gear, the visual defect detectors are provided in four groups, passive columns are fixedly installed on the front faces of the four groups of visual defect detectors, and limit seats are fixedly installed on the back faces of the four groups of visual defect detectors.

[0012] Further, the passive columns are inserted into the interiors of the passive slots, the passive slots are provided in four groups and are evenly formed in the surface of the driving disc, an external gear is fixedly arranged on the circumferential outer wall of the driving disc, and a driving gear is meshingly connected to the external gear.

[0013] Further, the driving disc is evenly provided with four groups of passive slots, the interiors of the four groups of passive slots are all inserted with passive columns, the passive slots are driven to rotate through the external gear and the driving gear and drive the visual defect detectors to lift through the passive columns.

[0014] Further, the circumferential inner wall of the driving disc is evenly provided with four groups of guide seats, the four groups of guide seats are movably inserted into guide slots formed in the interior of a guide rail, the guide rail is provided in an annular shape, and the guide slots in the interior of the guide rail and the guide seats are all provided in an isosceles trapezoidal shape.

[0015] Further, the circumferential inner wall of the guide rail is evenly provided with four groups of rack fixing seats A, the rack fixing seats A are provided in an "L" shape, two groups of screw holes are formed in the rack fixing seats A, the guide rail is installed on the carbon fiber wire conveying equipment through the four groups of rack fixing seats A, two groups of guide holes are formed in the limit seats on the back faces of the visual defect detectors, limit columns are inserted into the interiors of the two groups of guide holes, the limit columns are fixedly arranged on rack fixing seats B, three groups of stabilizing frames are evenly installed on the surfaces of the rack fixing seats B, positioning frames are fixedly arranged on the ends of the stabilizing frames away from the rack fixing seats B, four groups of screw holes are evenly formed in the rack fixing seats B, and the rack fixing seats B are screwingly fixed on the carbon fiber wire conveying equipment through the screw holes.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. This invention uses four sets of visual defect detectors to inspect the top, bottom, left, and right sides of carbon fiber precursor, achieving comprehensive coverage of the precursor surface, avoiding blind spots, and promptly detecting defects in various parts of the precursor, such as surface scratches, bubbles, and impurities, thus improving the stability and consistency of product quality. The precursor magnification mechanism magnifies the inspection surface, allowing the visual defect detectors to more clearly observe the subtle features and potential defects on the surface of the carbon fiber precursor. Even very small flaws can be accurately identified and analyzed, helping to promptly detect problems during production, reduce the defect rate, and improve production efficiency. By performing multi-directional inspection of the precursor, the detection accuracy is improved.

[0018] 2. This invention allows for synchronous adjustment of the distance between four sets of visual defect detectors and four sets of convex lenses via four sets of passive slots, passive columns, passive gears, external gears, and active gears. The specifications and diameters of carbon fiber precursors may vary. By synchronously adjusting the distance, the optimal distance between the convex lenses and the visual defect detectors can be adjusted according to different specifications of precursors, ensuring clear imaging and accurate detection for precursors of varying thicknesses, thus improving the versatility and adaptability of the detection equipment. The synchronous adjustment design makes it more convenient and faster for operators to adjust the detection system. A single, unified adjustment operation can simultaneously change the distance between the four sets of convex lenses and the visual defect detectors, eliminating the need for separate adjustments to each set, reducing operation steps and time, and improving the operability and efficiency of the equipment. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a bottom view of the structure of the present invention;

[0021] Figure 3 This is a top view of the structure of the present invention;

[0022] Figure 4 This is a rear view of the structure of the present invention;

[0023] Figure 5 This is a partial structural diagram of the present invention;

[0024] Figure 6 The structure of this invention Figure 1 Cross-sectional view;

[0025] Figure 7 The structure of this invention Figure 6 A magnified structural diagram at point A in the diagram.

[0026] [Figure Labels]

[0027] 1, carbon fiber precursor; 2, precursor magnification mechanism; 21, first convex mirror; 22, second convex mirror; 23, third convex mirror; 24, fourth convex mirror; 25, butt joint seat; 26, support frame; 27, positioning frame; 28, detection hole; 3, defect detection mechanism; 31, mounting seat; 32, visual defect detector; 33, passive column; 34, passive groove; 35, active disc; 36, guide seat; 37, guide rail; 38, rack fixing seat A; 39, external gear; 391, driving gear; 4, rack fixing seat B; 41, limiting column; 42, limiting seat; 43, stabilizing frame. DETAILED DESCRIPTION

[0028] Specific implementation one: please refer to Figures 1-7 The present application provides a technical scheme: a kind of defect detection device for carbon fiber precursor, including defect detection mechanism 3, the inside of defect detection mechanism 3 is installed with precursor magnification mechanism 2, precursor magnification mechanism 2 is inserted with carbon fiber precursor 1 in the inside, the back of precursor magnification mechanism 2 is installed with rack fixing seat B 4, and first convex mirror 21 is provided on precursor magnification mechanism 2, second convex mirror 22 is installed on the side of first convex mirror 21, third convex mirror 23 is provided on the side of second convex mirror 22 away from first convex mirror 21, and fourth convex mirror 24 is installed on the side of third convex mirror 23 away from second convex mirror 22;Visual defect detector 32 is provided on defect detection mechanism 3, and mounting seat 31 is provided at the bottom of visual defect detector 32, and positioning frame 27 is installed at the bottom of mounting seat 31.

[0029] Working principle: In actual use, the equipment in the device is installed on the carbon fiber precursor conveying equipment through four groups of guide rails 37 through four groups of rack fixing seats A 38; the rack fixing seat B4 is fixed on the carbon fiber precursor conveying equipment through the screw hole on it; when the carbon fiber precursor 1 is conveyed on the carbon fiber precursor conveying equipment, the detection surface of the carbon fiber precursor 1 can be enlarged through the precursor magnifying mechanism 2, and then the upper, lower, left and right four surfaces of the carbon fiber precursor 1 are visually detected through four groups of visual defect detectors 32; the four surfaces of the carbon fiber precursor 1 are detected through the four groups of visual defect detectors 32, which can realize the full coverage of the surface of the precursor, avoid the detection blind area, and timely find the defects existing in each part of the precursor, such as surface scratches, bubbles and impurities, which helps to improve the stability and consistency of product quality; the precursor magnifying mechanism 2 can enlarge the detection surface, so that the visual defect detector 32 can more clearly observe the fine features and potential defects on the surface of the carbon fiber precursor 1; even very small flaws can be accurately identified and analyzed, which helps to discover problems in the production process in time, reduces the rate of defective products, and improves production efficiency; visual detection belongs to a non-contact detection method, which will not cause physical damage to the carbon fiber precursor 1, avoid the problems of surface wear and deformation of the precursor caused by contact detection, and ensure the integrity and performance of the precursor are not affected; real-time detection during the conveying process of the carbon fiber precursor 1 can obtain the quality information of the precursor in time; once defects are found, corresponding measures can be taken immediately, such as stopping adjustment, marking the defect position, etc., which helps to correct the problems in the production process in time, avoid the generation of a large number of unqualified products, and reduce production cost; the specific way of the precursor magnifying mechanism 2 to enlarge the carbon fiber precursor 1 is that the first convex mirror 21, the second convex mirror 22, the third convex mirror 23 and the fourth convex mirror 24 are respectively arranged on the precursor magnifying mechanism 2; the first convex mirror 21, the second convex mirror 22, the third convex mirror 23 and the fourth convex mirror 24 are combined to form a cylindrical magnifying lens; the axial section of the magnifying lens, the positioning frame 27 and the carbon fiber precursor 1 is a concentric circle structure; the four convex mirrors are evenly distributed along the outer side of the circumference of the carbon fiber precursor 1, which realizes the magnification of the carbon fiber precursor 1 and the detection work through the visual defect detector 32; the visual detection means of the visual defect detector 32 is a conventional means in the prior art, and its working principle is well known to those skilled in the art, such as the HD-TXW type carbon fiber defect online detection system developed by Xi'an Huiteng; the system uses imported high-performance cameras and customized LED light sources to transmit image data through gigabit network; the camera is responsible for capturing the image of the carbon fiber precursor, and the light source provides stable, reliable and small light decay illumination to ensure image quality; the industrial computer processes and analyzes the collected images, which can detect the appearance defects such as hair and hair balls on each carbon fiber in real time, and can also monitor the state of each drop cylinder in real time, and has functions such as defect image display, position positioning, data storage, statistical analysis, etc.

[0030] The distance between the four sets of visual defect detectors 32 and the four sets of convex mirrors can be adjusted synchronously through the four sets of passive grooves 34, passive columns 33, passive grooves 34, external gears 39, and driving gears 391; the specifications and diameters of the carbon fiber precursor 1 may vary; by synchronously adjusting the distance, the optimal distance between the convex mirror and the visual defect detector 32 can be adjusted according to different specifications of the precursor, ensuring that different thicknesses of the precursor can achieve clear imaging and accurate detection, improving the versatility and adaptability of the detection equipment; different detection scenarios and precursor characteristics may require different magnification and imaging distances to achieve the best detection effect; synchronous adjustment of the distance can accurately adjust the relative position of the convex mirror and the visual defect detector 32 according to the actual situation, so that the image of the precursor after magnification by the convex mirror can be captured by the visual defect detector 32 in the clearest and most accurate way, thereby improving the detection accuracy and reliability and helping to discover more subtle defects; in the actual production process, the detection environment may change, such as light conditions, precursor conveying speed, etc.; by synchronously adjusting the distance, the parameters of the detection system can be adjusted in a timely manner according to environmental changes to ensure that stable and high-quality detection results can be obtained in different environments; for example, when the light is dim, the distance can be adjusted appropriately to increase the brightness and contrast of the image to better identify defects; the design of synchronous adjustment of the distance makes it more convenient and efficient for the operator to adjust the detection system; only one unified adjustment operation is needed to change the distance between the four sets of convex mirrors and the visual defect detector 32, without the need to adjust each set of convex mirror individually, reducing the operation steps and time, and improving the operability and working efficiency of the equipment; the driving and lifting mode of the four sets of visual defect detectors 32 is as follows: the driving gear 391 can rotate under the drive of the motor, the driving gear 391 drives the external gear 39 to rotate, the external gear 39 drives the passive groove 34 on the driving disc 35 to rotate, the passive column 33 inside the passive groove 34 can lift under the action of external force, at this time the adjustment of the distance between the visual defect detector 32 and the convex mirror is realized, and the two sets of limiting columns 41 are inserted into the limiting seat 42 at the back of the visual defect detector 32 during movement, which can limit and guide the visual defect detector 32 during movement to avoid tilting of the visual defect detector 32 during movement.

[0031] Specific embodiment two: this embodiment is a further limitation of the first specific embodiment, the precursor magnification mechanism 2 includes a first convex mirror 21, a second convex mirror 22, a third convex mirror 23, a fourth convex mirror 24, a butt joint seat 25, a support frame 26, a positioning frame 27 and a detection hole 28; the first convex mirror 21, the second convex mirror 22, the third convex mirror 23 and the fourth convex mirror 24 are center-symmetric structures about the carbon fiber precursor 1.

[0032] Specific embodiment three: this embodiment is a further limitation of specific embodiment two, the two adjacent groups of convex mirrors are fixedly connected through the butt joint seat 25, the section of the butt joint seat 25 is arranged in dovetail shape, meanwhile four groups of butt joint seats 25 are provided with splicing grooves, the splicing grooves are provided with splicing strips inside, the splicing strips and the splicing grooves are arranged in isosceles trapezoidal shape, the splicing strips are fixed inside the splicing grooves through bolts, and the outer sides of the four groups of splicing strips are fixedly provided with support frames 26.

[0033] Specific embodiment four: this embodiment is a further limitation of specific embodiment three, the ends of the four groups of support frames 26 are fixed with the circumferential inner wall of the positioning frame 27, the positioning frame 27 is an annular structure made of metal material, and four groups of detection holes 28 are uniformly arranged on the circumferential outer wall of the positioning frame 27.

[0034] Specific embodiment five: this embodiment is a further limitation of specific embodiment two, the interiors of the four groups of detection holes 28 are inserted with visual defect detectors 32, and the four groups of visual defect detectors 32 are respectively arranged opposite to the first convex mirror 21, the second convex mirror 22, the third convex mirror 23 and the fourth convex mirror 24; the first convex mirror 21, the second convex mirror 22, the third convex mirror 23 and the fourth convex mirror 24 are combined to form a cylindrical magnifying lens, and the axial section of the magnifying lens, the positioning frame 27 and the carbon fiber precursor 1 is a concentric circle structure.

[0035] Specific embodiment six: this embodiment is a further limitation of specific embodiment one, the defect detection mechanism 3 comprises a mounting seat 31, a visual defect detector 32, a passive column 33, a passive groove 34, a driving disc 35, a guide seat 36, a guide rail 37, a rack fixing seat A 38, an external gear 39 and a driving gear 391, the visual defect detector 32 is provided as four groups, the front surface of the four groups of visual defect detectors 32 is fixedly provided with the passive column 33, and the back surface of the four groups of visual defect detectors 32 is fixedly provided with the limiting seat 42.

[0036] Specific embodiment seven: this embodiment is a further limitation of specific embodiment six, the passive column 33 is inserted in the interior of the passive groove 34, the passive groove 34 is arranged in an inclined manner, the passive groove 34 is arranged as four groups and is uniformly arranged on the surface of the driving disc 35, the external gear 39 is fixedly arranged on the circumferential outer wall of the driving disc 35, and the driving gear 391 is engaged with the external gear 39.

[0037] Specific embodiment eight: this embodiment is a further limitation of specific embodiment seven, four groups of passive grooves 34 are uniformly arranged on the driving disc 35, the passive columns 33 are inserted in the interiors of the four groups of passive grooves 34, the passive grooves 34 are driven to rotate through the external gear 39 and the driving gear 391, and the visual defect detectors 32 are driven to ascend and descend through the passive columns 33.

[0038] Specific implementation nine: this implementation is further limited to the specific implementation six, the circumferential inner wall of the driving disc 35 is uniformly provided with four groups of guide seats 36, the four groups of guide seats 36 are movably inserted into the guide grooves in the guide rail 37, the guide rail 37 is arranged in a ring shape, and the guide grooves in the guide rail 37 and the guide seats 36 are both arranged in isosceles trapezoidal shape.

[0039] Specific implementation ten: this implementation is further limited to the specific implementation six, the circumferential inner wall of the guide rail 37 is uniformly provided with four groups of rack fixing seats A 38, the rack fixing seat A 38 is arranged in an “L” shape, two groups of threaded holes are formed in the rack fixing seat A 38, and the guide rail 37 is installed on the carbon fiber wire conveying equipment through the four groups of rack fixing seats A 38; two groups of guide holes are formed in the limiting seat 42 on the back of the visual defect detector 32, the limiting column 41 is inserted into the two groups of guide holes, the limiting column 41 is fixedly arranged on the rack fixing seat B 4, three groups of stabilizing frames 43 are uniformly arranged on the surface of the rack fixing seat B 4, the positioning frame 27 is fixedly arranged on the end of the stabilizing frame 43 away from the rack fixing seat B 4, four groups of threaded holes are uniformly formed in the rack fixing seat B 4, and the rack fixing seat B 4 is fixedly connected to the carbon fiber wire conveying equipment through the threaded holes.

Claims

1. A defect detection device for carbon fiber precursor, comprising a defect detection mechanism (3), characterized in that: The inside of the defect detection mechanism (3) is provided with a raw wire amplification mechanism (2), the inside of the raw wire amplification mechanism (2) is inserted with a carbon fiber raw wire (1), the back of the raw wire amplification mechanism (2) is provided with a rack fixing seat B (4), the raw wire amplification mechanism (2) is provided with a first convex mirror (21), one side of the first convex mirror (21) is provided with a second convex mirror (22), the side, away from the first convex mirror (21), of the second convex mirror (22) is provided with a third convex mirror (23), and the side, away from the second convex mirror (22), of the third convex mirror (23) is provided with a fourth convex mirror (24); the defect detection mechanism (3) is provided with a visual defect detector (32), and the bottom of the visual defect detector (32) is provided with a mounting seat (31); and the bottom of the mounting seat (31) is provided with a positioning frame (27). The raw wire amplification mechanism (2) comprises the first convex mirror (21), the second convex mirror (22), the third convex mirror (23), the fourth convex mirror (24), a butt joint seat (25), a support frame (26), the positioning frame (27) and a detection hole (28); the first convex mirror (21), the second convex mirror (22), the third convex mirror (23) and the fourth convex mirror (24) are in a central symmetry structure with the carbon fiber raw wire (1) as the center; the inside of each of the four groups of detection holes (28) is inserted with the visual defect detector (32), and the four groups of visual defect detectors (32) are oppositely arranged with the first convex mirror (21), the second convex mirror (22), the third convex mirror (23) and the fourth convex mirror (24) respectively; the first convex mirror (21), the second convex mirror (22), the third convex mirror (23) and the fourth convex mirror (24) are combined to form a cylindrical amplification lens, and the axial section of the amplification lens, the positioning frame (27) and the carbon fiber raw wire (1) is in a concentric circle structure; the defect detection mechanism (3) comprises the mounting seat (31), the visual defect detector (32), a passive column (33), a passive groove (34), a driving disc (35), a guide seat (36), a guide rail (37), a rack fixing seat A (38), an external gear (39) and a driving gear (391), the visual defect detector (32) is provided in four groups, the front surface of each of the four groups of visual defect detectors (32) is fixedly provided with the passive column (33), and the back surface of each of the four groups of visual defect detectors (32) is fixedly provided with a limiting seat (42); the passive column (33) is inserted into the inside of the passive groove (34), the passive groove (34) is arranged to be inclined, the four groups of passive grooves (34) are evenly arranged on the surface of the driving disc (35), the circumferential outer wall of the driving disc (35) is fixedly provided with the external gear (39), and the external gear (39) is in meshing connection with the driving gear (391); the driving disc (35) is evenly provided with the four groups of passive grooves (34), the inside of each of the four groups of passive grooves (34) is inserted with the passive column (33), and the passive groove (34) is driven to rotate through the external gear (39) and the driving gear (391) and drives the visual defect detector (32) to ascend and descend through the passive column (33).

2. A device for detecting defects in a carbon fiber precursor according to claim 1, characterized by: The two adjacent convex mirrors are fixedly connected through the butt joint base 25. The butt joint base 25 is provided in a swallowtail shape in section, and four butt joint bases 25 are provided with splicing grooves. Splicing strips are positioned and inserted into the splicing grooves. The splicing strips and the splicing grooves are provided in an isosceles trapezoidal shape. The splicing strips are fixed in the splicing grooves through bolts. The four splicing strips are provided with support frames 26 on the outer sides.

3. A device for detecting defects in a carbon fiber precursor according to claim 2, characterized in that: The end portions of the four support frames 26 are fixed to the circumferential inner wall of the positioning frame 27. The positioning frame 27 is provided in an annular structure made of metal. Four detection holes 28 are uniformly arranged on the circumferential outer wall of the positioning frame 27. The four detection holes 28 are provided in a circular shape.

4. A device for detecting defects in a carbon fiber precursor according to claim 1, characterized by: Four guide seats 36 are uniformly arranged on the circumferential inner wall of the driving disc 35. The four guide seats 36 are movably inserted into the guide grooves arranged in the guide rail 37. The guide rail 37 is provided in an annular shape. The guide groove in the guide rail 37 and the guide seat 36 are provided in an isosceles trapezoidal shape in section.

5. A device for detecting defects in a carbon fiber precursor according to claim 4, characterized in that: Four rack fixing seats A 38 are uniformly arranged on the circumferential inner wall of the guide rail 37. The rack fixing seat A 38 is provided in an "L" shape. Two screw holes are arranged on the rack fixing seat A 38. The guide rail 37 is installed on the carbon fiber wire conveying equipment through the four rack fixing seats A 38. Two guide holes are arranged on the limiting seat 42 at the back of the visual defect detector 32. Two limiting columns 41 are inserted into the two guide holes. The limiting column 41 is fixed to the rack fixing seat B 4. Three stabilizing frames 43 are uniformly arranged on the surface of the rack fixing seat B 4. The stabilizing frame 43 is fixedly installed with the positioning frame 27 at the end away from the rack fixing seat B 4. Four screw holes are uniformly arranged on the rack fixing seat B 4. The rack fixing seat B 4 is screw-fixed to the carbon fiber wire conveying equipment through the screw holes.

Images