A defect capturing device for composite fiber tow

Abstract

The present invention discloses a defect capturing device for composite fiber bundles, and relates to the technical field of composite fiber bundle defect detection, comprising a box body, a wire outlet pipe and a defect contact piece, wherein a fixed plate is arranged in the box body, an outer ring is arranged on the fixed plate, an inner ring is arranged rotatably inside the outer ring, a circular cylinder is fixedly connected to the inner wall of the inner ring, an oiling mechanism is arranged in the circular cylinder, and a gear is arranged on the top of the circular cylinder; an oiling mechanism is arranged on the rear end surface of the box body; an electric push rod is arranged on the rear end surface of the box body, and a linkage mechanism is arranged on the movable end of the electric push rod; the present invention facilitates the operation of the oiling mechanism and the oiling mechanism first through the use of the linkage mechanism, so as to rotate the sponge, which is beneficial to cleaning dust or impurities on the surface of the composite fiber bundle, avoiding dust or impurities being regarded as defects of the composite fiber bundle, thereby avoiding the occurrence of misdetection, and is beneficial to defect detection of the composite fiber bundle.

Description

Technical Field

[0001] The invention relates to the technical field of composite fiber tow defect detection, and in particular to a defect capturing device for composite fiber tow. Background Art

[0002] A composite fiber tow is a tow composed of two or more polymers with different chemical or physical properties, and is made through a composite spinning technology. In the production process of the composite fiber tow, some defects will inevitably appear on the fibers, and the presence of defects greatly reduces the quality of the fiber tow. Therefore, it is necessary to detect the defects of the composite fiber tow, thereby requiring the use of a defect capture device. However, when the existing defect capture device is used, since the composite fiber tow will produce impurities such as flying flowers and dust during production, and these impurities will fall on the composite fiber tow and will firmly adhere to the surface of the composite fiber tow, and these impurities will be mistaken for defects in the composite fiber tow, resulting in detection errors, affecting the accuracy of the composite fiber tow detection. Summary of the invention

[0003] The present invention is to solve the problems in the background technology and to provide a defect capturing device for composite fiber tows.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A defect catching device for composite fiber tows, comprising a box, a wire outlet pipe and a defect contact, wherein a fixed plate is arranged in the box, an outer ring is arranged on the fixed plate, an inner ring is arranged rotatably inside the outer ring, a circular cylinder is fixedly connected to the inner wall of the inner ring, an oiling mechanism for oiling the composite fiber tow is arranged in the circular cylinder, and a gear is arranged on the top of the circular cylinder;

[0006] The rear end surface of the box body is provided with an oil filling mechanism for filling oil to the outer ring;

[0007] A vertical plate is provided in the box body, a rectangular opening is provided on the vertical plate, and a cleaning mechanism for cleaning the oiling mechanism is provided in the rectangular opening;

[0008] An electric push rod is arranged on the rear end surface of the box body, and a linkage mechanism is arranged on the movable end of the electric push rod.

[0009] Preferably, the oiling mechanism includes a plurality of arc-shaped cavities opened in a circular cylinder, an annular frame slidably arranged in the arc-shaped cavities and a sponge arranged on the outer wall of the annular frame, a plurality of oil holes are opened on the surface of the annular frame in contact with the sponge, the annular frame and the inner ring are connected through oil guide pipe 3, and an extrusion spring 2 is provided between the annular frame and the arc-shaped cavity.

[0010] Preferably, the oil adding mechanism includes an oil tank arranged on the top surface of the box body, a sealing box arranged in the box body and a piston slidably arranged in the sealing box, the sealing box and the oil tank are connected through an oil guide pipe 1, and a one-way oil inlet valve is provided on the outer wall of the oil guide pipe 1, and the sealing box and the outer ring are connected through an oil guide pipe 2, and a one-way oil outlet valve is provided on the oil guide pipe 2.

[0011] Preferably, the cleaning mechanism comprises a connecting frame slidably arranged in the rectangular opening, an annular scraper is arranged at one end of the connecting frame, and a return spring is arranged between the connecting frame and the rectangular opening.

[0012] Preferably, the linkage mechanism includes a strip frame arranged at the movable end of the electric push rod, and a movable block and an extrusion spring 1 slidably arranged in the strip frame, and the extrusion spring 1 is located on one side of the fixed end of the electric push rod, the movable block is provided with a connecting plate connected to the piston, and the connecting plate is provided with a strip tooth plate meshing with the gear, a rectangular plate is fixedly connected to the bottom of the strip frame, a rectangular groove is provided on the rectangular plate, a round rod matching the connecting frame is slidably provided in the rectangular groove, and an adjusting piece matching the round rod is provided on the rear end surface of the box body.

[0013] Preferably, the adjusting member comprises a straight groove formed on the rear end surface of the box body, and the rear end surface of the box body is also provided with an inclined groove connected to the straight groove, and both the straight groove and the inclined groove cooperate with the round rod.

[0014] Preferably, the defective contact comprises a rectangular box arranged on the bottom surface of the box body, a touch plate slidably arranged in the rectangular box and a plurality of circular holes opened on the touch plate, an extrusion spring and a displacement sensor are arranged between the touch plate and the rectangular box, and the sensing head of the displacement sensor is in contact with the touch plate.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] The present invention uses a linkage mechanism to facilitate the operation of the oil adding mechanism and the oil applying mechanism first, thereby achieving quantitative addition of lubricating oil to the sponge, and the sponge can be rotated while the lubricating oil is being added, so that the lubricating oil is evenly applied to the composite fiber bundle, thereby avoiding the occurrence of missing applications; and the sponge can also clean dust or impurities on the surface of the composite fiber bundle when rotating, thereby avoiding dust or impurities being considered as defects of the composite fiber bundle, thereby avoiding the occurrence of misdetection, and facilitating defect detection of the composite fiber bundle; then, under the action of the adjusting member, the annular scraper is moved downward to scrape and clean the impurities on the sponge, thereby improving the cleaning effect of the composite fiber bundle, while avoiding excessive impurities attached to the sponge to affect the oiling of the composite fiber bundle, and also avoiding impurities on the sponge from scratching the outer surface of the composite fiber bundle, thereby facilitating protection of the sponge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It shows a schematic structural diagram of a front viewing angle provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a cross-sectional structure at a front viewing angle provided by an embodiment of the present invention is shown;

[0019] Figure 3 A schematic structural diagram of a linkage mechanism provided by an embodiment of the present invention from a first perspective is shown;

[0020] Figure 4 A schematic structural diagram of a linkage mechanism according to a second viewing angle is shown;

[0021] Figure 5 A schematic structural diagram of a linkage mechanism provided by an embodiment of the present invention from a third viewing angle is shown;

[0022] Figure 6 A cross-sectional view of a sealing box provided according to an embodiment of the present invention is shown;

[0023] Figure 7 A schematic diagram of the cross-sectional structure of a circular cylinder provided in a front view according to an embodiment of the present invention is shown;

[0024] Figure 8 A schematic diagram of the cross-sectional structure of a circular cylinder from a top view provided by an embodiment of the present invention is shown;

[0025] Fig. 9 It shows a schematic structural diagram of a cleaning mechanism provided according to an embodiment of the present invention;

[0026] Fig.10 A schematic diagram of the structure of a defective contact provided in an embodiment of the present invention is shown;

[0027] Fig.11 A schematic structural diagram of an adjusting member provided according to an embodiment of the present invention is shown.

[0028] Legend:

[0029] 1. Box; 2. Oil guide pipe 1; 3. One-way oil inlet valve; 4. Wire outlet pipe; 5. Oil tank; 6. Vertical plate; 7. Adjustment piece; 701. Straight groove; 702. Inclined groove; 8. Defect contact piece; 801. Rectangular box; 802. Displacement sensor; 803. Extrusion spring 3; 804. Touch plate; 805. Circular hole; 9. Rectangular groove; 10. Rectangular plate; 11. Bar frame; 12. Electric push rod; 13. Sealed box; 14. Fixed Plate; 15, circular cylinder; 16, outer ring; 17, gear; 18, connecting plate; 19, strip tooth plate; 20, connecting frame; 21, rectangular opening; 22, round rod; 23, movable block; 24, extrusion spring one; 25, annular scraper; 26, oil guide pipe two; 27, one-way oil outlet valve; 28, piston; 29, sponge; 30, inner ring; 31, annular frame; 32, extrusion spring two; 33, oil guide pipe three; 34, reset spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 - Fig.11 , the present invention provides a technical solution:

[0032] A defect capturing device for composite fiber bundles, comprising a box body 1, a wire outlet pipe 4 installed on the top surface of the box body 1, and the wire outlet pipe 4 is used for outputting the composite fiber bundles, so that the composite fiber bundles can be transmitted in a certain direction and path for subsequent defect detection; a defect contact 8 installed on the inner bottom surface of the box body 1 is used to detect defects on the composite fiber bundles; a fixed plate 14 is provided in the box body 1, an outer ring 16 is provided on the fixed plate 14, and an inner ring 30 is rotatably provided inside the outer ring 16, wherein a dynamic sealing structure is provided between the outer ring 16 and the inner ring 30 to avoid oil leakage; at the same time, the arrangement of the outer ring 16 and the inner ring 30 is adopted to facilitate the rotation of the circular cylinder 15, thereby facilitating the rotation of the sponge 29, and further facilitating the oiling of the composite fiber bundles; a circular cylinder 15 is fixedly connected to the inner wall of the inner ring 30, and a collecting box (not shown in the figure, which is the prior art) is provided directly below the circular cylinder 15, which is used to collect the cleaned dust or debris Quality; an oiling mechanism for oiling the composite fiber tow is provided in the circular cylinder 15. By using the oiling mechanism, it is convenient to apply oil to the composite fiber tow, reduce the friction of the composite fiber tow during subsequent movement, thereby avoiding the wear of the composite fiber tow in the subsequent process, which is beneficial to protecting the composite fiber tow; at the same time, it is also possible to clean the dust or impurities on the surface of the composite fiber tow, avoid the dust or impurities being considered as defects of the composite fiber tow, thereby avoiding the occurrence of misdetection, which is beneficial to defect detection of the composite fiber tow; a gear 17 is provided on the top of the circular cylinder 15; the mutual cooperation of the gear 17 and the bar-shaped tooth plate 19 facilitates the rotation of the circular cylinder 15, thereby facilitating the rotation of the sponge 29, and further facilitating the uniform application of oil on the composite fiber tow, avoiding the occurrence of missed application; at the same time, it is also convenient to clean the firm impurities or dust on the composite fiber tow, thereby improving the cleaning effect of impurities or dust;

[0033] The rear end surface of the box body 1 is provided with an oil adding mechanism for adding oil to the outer ring 16; the use of the oil adding mechanism facilitates the delivery of lubricating oil into the outer ring 16, thereby facilitating the quantitative addition of lubricating oil to the sponge 29, thereby avoiding the waste of lubricating oil and saving resources;

[0034] A vertical plate 6 is provided in the box body 1, and a rectangular opening 21 is provided on the vertical plate 6. A cleaning mechanism for cleaning the oiling mechanism is provided in the rectangular opening 21. By using the cleaning mechanism, it is convenient to regularly clean the impurities on the sponge 29, thereby improving the cleaning effect of the composite fiber tow, while preventing the sponge 29 from having too many impurities attached to it and affecting the oiling of the composite fiber tow, and also preventing the impurities on the sponge 29 from scratching the outer surface of the composite fiber tow, thereby facilitating the protection of the sponge 29;

[0035] An electric push rod 12 is provided on the rear end surface of the box body 1, and a linkage mechanism is provided at the movable end of the electric push rod 12; wherein, through the use of the linkage mechanism, it is convenient to first add lubricating oil to the sponge 29, and the sponge 29 can be rotated while adding the lubricating oil, so that the lubricating oil is evenly applied to the composite fiber bundle to avoid the phenomenon of missing smearing, and then the annular scraper 25 is moved downward to scrape and clean the impurities on the sponge 29, thereby improving the effect of cleaning the composite fiber bundle, while avoiding excessive impurities attached to the sponge 29 and affecting the oiling of the composite fiber bundle, and also avoiding the impurities on the sponge 29 from scratching the outer surface of the composite fiber bundle, thereby facilitating the protection of the sponge 29.

[0036] In the present invention, the oiling mechanism includes a plurality of arc-shaped cavities provided in the circular cylinder 15, an annular frame 31 slidably provided in the arc-shaped cavities, and a sponge 29 provided on the outer wall of the annular frame 31, and the sponge 29 is made of an elastic and flexible sponge to facilitate the deformation and recovery of the sponge 29, thereby facilitating the cleaning of impurities on the sponge 29; a plurality of oil holes are provided on the surface of the annular frame 31 in contact with the sponge 29, thereby facilitating the lubricating oil in the annular frame 31 to enter the sponge 29 and realize the oiling of the sponge 29; the annular frame 31 is connected to the inner ring 30 through an oil guide pipe 3 33, and an extrusion spring 2 32 is provided between the annular frame 31 and the arc-shaped cavity. By using the extrusion spring 2 32, the annular frame 31 can be squeezed to facilitate the contact of the sponge 29 with the composite fiber bundle, thereby facilitating the application of the lubricating oil on the composite fiber bundle.

[0037] In the present invention, the oil adding mechanism includes an oil tank 5 (for placing lubricating oil) arranged on the top surface of the box body 1, a sealed box 13 arranged in the box body 1 and a piston 28 slidably arranged in the sealed box 13. The sealed box 13 and the oil tank 5 are connected through an oil guide pipe 2, and a one-way oil inlet valve 3 is provided on the outer wall of the oil guide pipe 2 to facilitate the lubricating oil to flow back into the oil tank 5; the sealed box 13 and the outer ring 16 are connected through an oil guide pipe 26, and a one-way oil outlet valve 27 is provided on the oil guide pipe 26 to prevent the lubricating oil in the outer ring 16 from flowing back into the sealed box 13.

[0038] In the present invention, the cleaning mechanism includes a connecting frame 20 slidably disposed in a rectangular opening 21 , an annular scraper 25 is disposed at one end of the connecting frame 20 , and the annular scraper 25 is in contact with the inner wall of the circular cylinder 15 to facilitate scraping off impurities on the sponge 29 .

[0039] A reset spring 34 is provided between the connecting frame 20 and the rectangular opening 21 . The reset spring 34 facilitates the reset of the connecting frame 20 , thereby facilitating the reset of the annular scraper 25 .

[0040] In the present invention, the linkage mechanism includes a strip frame 11 arranged at the movable end of the electric push rod 12, a movable block 23 slidably arranged in the strip frame 11 and an extrusion spring 24, and the extrusion spring 24 is located on one side of the fixed end of the electric push rod 12. Through the use of the extrusion spring 24, it is convenient to squeeze the movable block 23, so that the movable block 23 moves synchronously with the strip frame 11; a connecting plate 18 connected to the piston 28 is provided on the movable block 23, and a strip toothed plate 19 meshing with the gear 17 is provided on the connecting plate 18. A rectangular plate 10 is fixedly connected to the bottom of the strip frame 11, and a rectangular groove 9 is provided on the rectangular plate 10. A round rod 22 matching the connecting frame 20 is slidably provided in the rectangular groove 9. An adjusting member 7 matching the round rod 22 is provided on the rear end surface of the box body 1. Through the use of the adjusting member 7, it is convenient to move the round rod 22 to the top of the connecting frame 20 first, and then the connecting frame 20 is moved downward to drive the annular scraper 25 to move downward to scrape impurities on the sponge 29.

[0041] In the present invention, the adjusting member 7 includes a straight groove 701 provided on the rear end surface of the box body 1, and an inclined groove 702 connected to the straight groove 701 is also provided on the rear end surface of the box body 1, and the straight groove 701 and the inclined groove 702 are both matched with the round rod 22. By using the straight groove 701, it is convenient to limit the round rod 22 to ensure that the round rod 22 can be moved above the connecting frame 20; by using the inclined groove 702, it is convenient to move the round rod 22 downward to squeeze the connecting frame 20 and move the connecting frame 20 downward, thereby driving the annular scraper 25 to move downward to clean the sponge 29.

[0042] In the present invention, the defect contact 8 includes a rectangular box 801 arranged on the bottom surface of the box body 1, a touch plate 804 slidably arranged in the rectangular box 801, and a plurality of circular holes 805 opened on the touch plate 804, and the inner diameters of the circular holes 805 are different, which is convenient for detecting composite fiber bundles with different diameters; an extrusion spring 803 and a displacement sensor 802 are arranged between the touch plate 804 and the rectangular box 801, wherein the displacement sensor 802 is connected to an external control device (not shown in the figure, it is a prior art, and the principle of its use is not described here) through Radio connection; and the sensing head of the displacement sensor 802 is in contact with the touch plate 804; the specific operation of the composite fiber bundle defect detection is: the composite fiber bundle is passed through the circular hole 805 that matches the composite fiber bundle, and when the defect on the composite fiber bundle passes through the circular hole 805, it will be blocked, thereby driving the touch plate 804 to move, and at this time, the displacement sensor 802 will receive the signal, and then transmit the signal to the external control device, which is processed by the external control device and determines that this is a defect, thereby realizing the defect detection of the composite fiber bundle.

[0043] Working principle: When the present invention is used, the composite fiber tow is first passed through the outlet pipe 4 into the box body 1, then passed through the sponges 29 in the circular cylinder 15, passed through the guide wheels (not shown in the figure, it is the prior art) in the box body 1 and passed through the circular holes 805 corresponding to the composite fiber tow, and finally passed out of the box body 1;

[0044] When the composite fiber tow moves in the circular hole 805, if there is no defect on the composite fiber tow, the composite fiber tow can smoothly pass through the circular hole 805; if there is a defect on the composite fiber tow, the composite fiber tow will be hindered when moving in the circular hole 805, and then the touch plate 804 will be displaced. At this time, the displacement sensor 802 will receive a signal and transmit the signal to the external control device, and the processor in the external control device will process and determine that the location is a defect.

[0045] When the composite fiber tow is tested, the electric push rod 12 is turned on, and the initial position of the movable end of the electric push rod 12 (recorded as point A), the movable end position of the electric push rod 12 when the strip tooth plate 19 contacts the inner wall of the box body 1 (recorded as point B), and the end of the movable end of the electric push rod 12 (recorded as point C); the movement of the movable end of the electric push rod 12 drives the bar frame 11 to move, and the movement of the bar frame 11 is divided into two processes:

[0046] Process 1: When the movable end of the electric push rod 12 moves back and forth between point A and point B:

[0047] When the movable end of the electric push rod 12 moves from point A to point B, the bar frame 11 moves with the movable end of the electric push rod 12, and then under the action of the extrusion spring 1 24, the movable block 23 moves synchronously with the bar frame 11, thereby driving the connecting plate 18 to move, thereby driving the bar tooth plate 19 and the piston 28 to move;

[0048] The movement of the piston 28 will transport the lubricating oil in the sealing box 13 to the outer ring 16 through the second oil guide pipe 26, and then the lubricating oil will enter the annular frame 31 through the third oil guide pipe 33, and finally the lubricating oil will flow to the sponge 29 through the oil hole, and then the sponge 29 will contact with the composite fiber tow to achieve oiling of the composite fiber tow;

[0049] When the strip-shaped tooth plate 19 moves, it drives the circular cylinder 15 to rotate, and then drives the sponge 29 to rotate, so as to facilitate the comprehensive application of lubricating oil to the composite fiber tow, avoid the phenomenon of missing lubrication, and facilitate the detection of the composite fiber tow;

[0050] When the movable end of the electric push rod 12 moves to point B, the circular cylinder 15 rotates one circle, and the circular rod 22 moves to the connecting frame 20 under the action of the straight groove 701;

[0051] When the movable end of the electric push rod 12 moves from point B to point A, the bar frame 11 will be reset, and then the round rod 22 and the connecting plate 18 will be reset, and the reset of the connecting plate 18 will drive the bar tooth plate 19 to reset, thereby realizing the rotation of the circular cylinder 15; at the same time, when the connecting plate 18 is reset, it will drive the piston 28 to reset, thereby pumping the lubricating oil in the oil tank 5 into the sealing box 13, so as to facilitate the re-addition of lubricating oil to the upper outer ring 16;

[0052] The lubricating oil is applied to the composite fiber bundle by reciprocating the movable end of the electric push rod 12 between point A and point B;

[0053] Process 2, when the movable end of the electric push rod 12 moves from point B to point C, at this time, the strip tooth plate 19 does not move because it contacts the inner wall of the box body 1, and as the bar frame 11 continues to move, the round rod 22 is driven to move into the inclined groove 702, and then the round rod 22 moves along the inclined groove 702 to move downward, thereby driving the connecting frame 20 to move downward, thereby driving the annular scraper 25 to move downward, and the dust or impurities on the sponge 29 are cleaned by the contact between the annular scraper 25 and the sponge 29, and the cleaned impurities or dust fall into the collection box below the circular cylinder 15;

[0054] When the movable end of the electric push rod 12 moves from point C to point B, the round rod 22 moves into the straight groove 701, and the connecting frame 20 is reset under the action of the reset spring 34, so that the annular scraper 25 is reset.

[0055] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A defect catching device for composite fiber tow, comprising a housing (1), a fiber outlet pipe (4) and a defect contact (8), characterized in that: A fixing plate (14) is provided in the box body (1), an outer ring (16) is provided on the fixing plate (14), an inner ring (30) is rotatably provided in the outer ring (16), a circular cylinder (15) is fixedly connected to the inner wall of the inner ring (30), an oiling mechanism for oiling the composite fiber bundle is provided in the circular cylinder (15), and a gear (17) is provided on the top of the circular cylinder (15); The rear end surface of the housing (1) is provided with an oil filling mechanism for filling oil to the outer ring (16); A vertical plate (6) is provided in the box body (1), a rectangular opening (21) is provided on the vertical plate (6), and a cleaning mechanism for cleaning the oiling mechanism is provided in the rectangular opening (21); An electric push rod (12) is provided on the rear end surface of the box body (1), and a linkage mechanism is provided at the movable end of the electric push rod (12); The oiling mechanism comprises a plurality of arc-shaped cavities formed in the circular cylinder (15), an annular frame (31) slidably disposed in the arc-shaped cavities, and a sponge (29) disposed on the outer wall of the annular frame (31); a plurality of oil holes are formed on the surface of the annular frame (31) in contact with the sponge (29); the annular frame (31) and the inner ring (30) are connected via a third oil guide pipe (33); and a second extrusion spring (32) is disposed between the annular frame (31) and the arc-shaped cavities; The oil filling mechanism comprises an oil tank (5) arranged on the top surface of the box body (1), a sealing box (13) arranged in the box body (1), and a piston (28) slidably arranged in the sealing box (13); the sealing box (13) and the oil tank (5) are connected via an oil guide pipe (2); a one-way oil inlet valve (3) is provided on the outer wall of the oil guide pipe (2); the sealing box (13) and the outer ring (16) are connected via an oil guide pipe (26); a one-way oil outlet valve (27) is provided on the oil guide pipe (26); The linkage mechanism comprises a strip frame (11) arranged at the movable end of the electric push rod (12), a movable block (23) and a compression spring (24) slidably arranged in the strip frame (11), and the compression spring (24) is located on one side of the fixed end of the electric push rod (12). The movable block (23) is provided with a connecting plate (18) connected to a piston (28), and the connecting plate (18) is provided with a strip tooth plate (19) meshing with a gear (17). A rectangular plate (10) is fixedly connected to the bottom of the strip frame (11), a rectangular groove (9) is provided on the rectangular plate (10), and a round rod (22) matching with the connecting frame (20) is slidably arranged in the rectangular groove (9), and an adjusting member (7) matching with the round rod (22) is provided on the rear end surface of the box body (1).

2. A defect capturing device for composite fiber tow according to claim 1, characterized in that: The cleaning mechanism comprises a connecting frame (20) slidably arranged in a rectangular opening (21), an annular scraper (25) being provided at one end of the connecting frame (20), and a return spring (34) being provided between the connecting frame (20) and the rectangular opening (21).

3. A defect catching device for composite fiber tow according to claim 2, characterized in that: The adjusting member (7) comprises a straight groove (701) formed on the rear end surface of the box body (1), and an inclined groove (702) communicating with the straight groove (701) is also formed on the rear end surface of the box body (1), and both the straight groove (701) and the inclined groove (702) are matched with the round rod (22).

4. A defect catching device for composite fiber tow according to claim 3, characterized in that: The defect contact (8) comprises a rectangular box (801) arranged on the inner bottom surface of the box body (1), a touch plate (804) slidably arranged in the rectangular box (801), and a plurality of circular holes (805) opened on the touch plate (804); a compression spring (803) and a displacement sensor (802) are arranged between the touch plate (804) and the rectangular box (801), and the induction head of the displacement sensor (802) is in contact with the touch plate (804).

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