Wrapped yarn surface defect degree detection device and detection method

Abstract

The invention belongs to the technical field of detection, and particularly relates to a wrap yarn surface defect degree detection device and method. The covered yarn surface defect degree detection device comprises a driving roller which is rotatably arranged on a rack and is used for driving yarn to move horizontally; the positioning pipe is arranged below the driving roller in parallel; the adjusting assembly is arranged on the outer wall of the positioning pipe in a sleeving manner and is suitable for ascending and descending relative to the positioning pipe; yarns penetrate through the space between the adjusting assembly and the driving roller and then move horizontally. If the outer diameter of the knotted part of the yarn is smaller than the descending threshold value of the adjusting assembly, the knotted part of the yarn is suitable for penetrating through the gap between the adjusting assembly and the driving roller; if the outer diameter of the knotted part of the yarn is larger than the descending threshold value of the adjusting assembly, the knotted part of the yarn extrudes the adjusting assembly to move downwards, and the bottom wall of the rack limits rotation of the adjusting assembly so as to limit horizontal movement of the knotted part of the yarn. And through the arrangement of the adjusting assembly, the detection accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the field of detection technology, and particularly relates to the detection of the existence of defects, and more particularly to a device and method for detecting the surface defect degree of covered yarn. Background Art

[0002] After the covered yarn is produced and formed, the quality inspection of the yarn joint is a key link to ensure the finished product rate. Traditional detection systems mostly use CCD vision sensors to perform surface scanning on the running yarn, and identify the diameter mutation area through image processing algorithms. However, when the yarn passes through the detection area at a speed of ≥50 m / min, the following interferences will occur at the knotted joint: 1. The torsion of the joint causes the change of the surface reflectivity, resulting in an increase in the error of the gray value fluctuation.

[0003] 2. The three-dimensional spiral structure causes the projection imaging distortion, and the diameter measurement deviation increases.

[0004] 3. The high-speed movement causes motion blur, resulting in a decrease in the image resolution.

[0005] The above problems lead to an increase in the missed detection rate of the yarn joint by the traditional optical detection system.

[0006] Therefore, how to avoid the problem of the increase in the missed detection rate of the knotted yarn joint is a technical difficulty that needs to be broken through in this field.

[0007] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information related to the prior art. Summary of the Invention

[0008] The embodiments of the present disclosure at least provide a device and a method for detecting the surface defect degree of covered yarn.

[0009] In a first aspect, the embodiments of the present disclosure provide a device for detecting the surface defect degree of covered yarn, including: A driving roller rotatably arranged on the frame for driving the yarn to move horizontally; A positioning tube arranged parallel to the driving roller below; An adjusting assembly sleeved on the outer wall of the positioning tube and adapted to move up and down relative to the positioning tube; Wherein, the yarn passes through the gap between the adjusting assembly and the driving roller and then moves horizontally; If the outer diameter of the knotted part of the yarn is less than the descending threshold of the adjusting assembly, the knotted part of the yarn is adapted to pass through the gap between the adjusting assembly and the driving roller; If the outer diameter of the knotted part of the yarn is greater than the descending threshold of the adjusting assembly, the knotted part of the yarn presses the adjusting assembly to move downward, and the bottom wall of the frame limits the rotation of the adjusting assembly to limit the horizontal movement of the knotted part of the yarn.

[0010] In an alternative embodiment, the adjusting assembly includes: a pressure tube, which is sleeved on the outer wall of the positioning tube, and a plurality of first water holes are radially formed in the outer wall; Extension tubes, two of the extension tubes are respectively arranged at both ends of the pressure tube, the inner diameter of which is the same as that of the pressure tube, and the outer diameter is smaller than that of the pressure tube; A plurality of flexible members, which extend along the axial direction of the pressure tube, and the plurality of flexible members are circumferentially distributed along the inner wall of the extension tube; Wherein, after the yarn passes between the adjusting assembly and the driving roller, the yarn squeezes the pressure tube to move downward; When the pressure tube moves downward, the extension tube squeezes each flexible member located above the positioning tube to compress and deform; if the outer diameter of the knot of the yarn is greater than the descending threshold of the adjusting assembly, the bottom wall of the frame limits the rotation of the pressure tube.

[0011] In an alternative embodiment, a fixing tube is respectively sleeved on both ends of the outer wall of the positioning tube, and an accommodating cavity is provided between the fixing tube and the positioning tube; The outer diameter of the fixing tube is not greater than the outer diameter of the pressure tube; A sealing disc is respectively arranged at both ends of the fixing tube.

[0012] In an alternative embodiment, water is stored in the accommodating cavity, and the water level height is not greater than 1 / 3 of the diameter of the fixing tube; Wherein, when the pressure tube rotates, each flexible member is successively immersed in water.

[0013] In an alternative embodiment, the adjusting assembly further includes a sealing ring, and the two sealing rings are respectively arranged at the ends of the extension tube, and the sealing ring is adapted to seal the gap between the fixing tube and the positioning tube.

[0014] In an alternative embodiment, the flexible member includes: a water absorption strip, which is rectangular and extends along the axial direction of the extension tube; A protection piece, the cross section of which is "U"-shaped, and both ends are fixed on the inner wall of the extension tube, and the water absorption strip is located inside the protection piece; The inner wall of the protection piece is parallel to the outer wall of the positioning tube; Wherein, when the pressure tube is squeezed downward by the yarn, the positioning tube squeezes the protection piece and the water absorption strip to compress and deform, so that the water in the water absorption strip flows upward through the first water hole to the yarn.

[0015] In an alternative embodiment, a plurality of flow channels are axially formed in the extension tube, and one flow channel corresponds to one water absorption strip; The flow channel communicates with the first water hole and the water absorption strip; Wherein, when the protection piece and the water absorption strip are squeezed and deformed, the water in the water absorption strip flows to the first water hole through the flow channel.

[0016] In an alternative embodiment, the water-absorbing strip is a water-absorbing sponge with a porosity of 95-97%.

[0017] In an alternative embodiment, the axis of the flow channel forms an inclined angle of 8±0.5° with the axis of the extension pipe to guide the water flow towards the first water hole.

[0018] In an alternative embodiment, the inner wall of the flow channel is provided with a spiral guide groove with a groove depth of 0.1-0.3 mm and a pitch that is 2-3 times the diameter of the flow channel.

[0019] In a second aspect, the embodiments of the present disclosure further provide a detection method for a detection device, and the detection method includes: The yarn moves horizontally after passing between the adjusting assembly and the driving roller; If the outer diameter of the knotted part of the yarn is less than the descending threshold of the adjusting assembly, the knotted part of the yarn is adapted to pass through the gap between the adjusting assembly and the driving roller; If the outer diameter of the knotted part of the yarn is greater than the descending threshold of the adjusting assembly, the knotted part of the yarn squeezes the adjusting assembly to move downward, and the bottom wall of the frame limits the rotation of the adjusting assembly to limit the horizontal movement of the knotted part of the yarn.

[0020] The beneficial effects of the present invention are as follows: The present invention provides a detection device for the surface defect degree of covered yarn. Through the setting of the adjusting assembly, after the yarn passes between the driving roller and the pressure pipe, the driving roller rotates to drive the yarn to move horizontally while driving the pressure pipe to rotate synchronously. If the outer diameter of the knotted part of the yarn is less than the descending threshold of the adjusting assembly, the knotted part of the yarn is adapted to pass through the gap between the adjusting assembly and the driving roller; if the outer diameter of the knotted part of the yarn is greater than the descending threshold of the adjusting assembly, the knotted part of the yarn squeezes the adjusting assembly to move downward, and the bottom wall of the frame limits the rotation of the adjusting assembly to limit the horizontal movement of the knotted part of the yarn. Compared with the traditional optical detection method, the detection accuracy is significantly improved.

[0021] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0022] To make the above objectives, features, and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby cited and detailed descriptions are provided in conjunction with the accompanying drawings as follows. Description of the Drawings

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A perspective view of the surface defect degree detection device for covered yarn provided by an embodiment of the present disclosure; Figure 2 A perspective view of the driving roller, positioning tube, and adjusting assembly provided by an embodiment of the present disclosure; Figure 3 A longitudinal sectional perspective view of the positioning tube and adjusting assembly provided by an embodiment of the present disclosure; Figure 4 A transverse sectional perspective view of the positioning tube and adjusting assembly provided by an embodiment of the present disclosure; Figure 5 A sectional front view of the flexible member provided by an embodiment of the present disclosure.

[0025] In the figure: 1. Driving roller; 2. Positioning tube; 21. Fixed tube; 22. Accommodating cavity; 23. Sealing disc; 3. Adjusting assembly; 31. Pressing wire tube; 310. First water hole; 32. Extension tube; 320. Flow channel; 33. Flexible member; 331. Water absorption strip; 332. Protective sheet; 34. Sealing ring; 4. Yarn; 5. Frame; 6. Water level. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component can be directly formed on the second component, or a third component can be inserted between the first component and the second component. In addition, in the drawings, to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0028] In this document, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0029] The terms used herein are only for describing specific exemplary configurations and are not intended to be limiting. As used herein, the singular articles "a", "an", and "the" may also be intended to include the plural forms, unless it is clearly stated otherwise in the context. The terms "comprising", "including", and "having" are inclusive, so they specify the presence of features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The method steps, processes, and operations described herein should not be construed as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as the order of execution. Additional or alternative steps may be employed.

[0030] As used herein, phrases such as "in one embodiment", "according to one embodiment", "in some embodiments", etc. generally refer to the fact that the specific feature, structure, or characteristic after the phrase may be included in at least one embodiment of the present disclosure. Thus, a specific feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, terms such as "example", "exemplary", etc. are used "as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other embodiments, aspects, or designs. Instead, the use of terms such as "example", "exemplary", etc. is intended to present concepts in a specific manner.

[0031] It has been found through research that in the related art, after the covered yarn is produced and formed, the quality detection of the yarn joint is a key link to ensure the finished product rate. Traditional detection systems mostly use CCD vision sensors to perform surface scanning on the running yarn, and identify the diameter mutation area through image processing algorithms. However, when the yarn passes through the detection area at a speed of ≥50 m / min, the following interferences will occur at the knotted joint: 1. The twisting of the joint causes a change in the surface reflectance, resulting in an increase in the grayscale value fluctuation error.

[0032] 2. The three-dimensional helical structure causes projection imaging distortion, and the diameter measurement deviation increases.

[0033] 3. High-speed movement causes motion blur, resulting in a decrease in the image resolution.

[0034] The above problems lead to an increased missed detection rate of yarn joints by traditional optical detection systems.

[0035] Therefore, how to avoid the problem of increased missed detection rate of yarn joints after knotting is a technical difficulty that urgently needs to be broken through in this field.

[0036] Regarding the defects and causes of the above solutions, they are all the results obtained by the inventor through practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure for the above problems should be the contributions made by the inventor to this disclosure during the process of this disclosure.

[0037] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] Hereinafter, with reference to the drawings, some embodiments of the present invention will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0039] As Figures 1 to 5 shown, at least one embodiment provides a covering yarn surface defect degree detection device, including: a driving roller 1, which is rotatably arranged on a frame 5 and is used for driving a yarn 4 to move horizontally; a servo motor is arranged on one side of the frame 5, and the servo motor is adapted to drive the driving roller 1 to rotate circumferentially. The frame 5 has a frame structure, the driving roller 1 is parallel to the horizontal plane, and there is a gap between the outer wall of the driving roller 1 and the inner top wall of the frame 5. A positioning tube 2, which is arranged parallel to the driving roller 1 below; both ends of the positioning tube 2 are fixed on the two side walls of the frame 5. An adjusting assembly 3, which is sleeved on the outer wall of the positioning tube 2, the adjusting assembly 3 is adapted to rotate relative to the positioning tube 2, abuts against the yarn 4 and is adapted to move up and down relative to the positioning tube 2; there is a gap between the outer wall of the adjusting assembly 3 and the bottom wall of the frame 5, and during the normal conveying process of the yarn 4, the adjusting assembly 3 rotates relative to the frame 5.

[0040] Refer to the attached Figure 2 drawing, the yarn 4 passes through between the adjusting assembly 3 and the driving roller 1 and then moves horizontally; during the normal conveying process of the yarn 4, when the yarn 4 passes through the pressure tube 31 and the driving roller 1, the outer wall of the yarn 4 abuts against the outer walls of the pressure tube 31 and the driving roller 1 respectively; when the driving roller 1 rotates, while driving the yarn 4 to move horizontally, it drives the pressure tube 31 to rotate synchronously. At this time, the rotation direction of the pressure tube 31 is opposite to that of the driving roller 1. Figure 2In the figure, F1 represents the horizontal movement direction of the yarn 4; F2 represents the rotation direction of the driving roller 1 and the pressure guide tube 31. If the outer diameter of the knot of the yarn 4 is less than the lowering threshold of the adjusting component 3 (the lowering threshold refers to the maximum stroke of the downward movement of the pressure guide tube 31 relative to the positioning tube 2. If the pressure guide tube 31 moves downward to the maximum stroke, the pressure guide tube 31 is limited by the bottom wall of the machine frame, resulting in the pressure guide tube 31 being unable to rotate relative to the positioning tube 2 continuously), the knot of the yarn 4 is suitable for passing through the gap between the adjusting component 3 and the driving roller 1; if the outer diameter of the knot of the yarn 4 is greater than the lowering threshold of the adjusting component 3, the knot of the yarn 4 squeezes the adjusting component 3 to move downward, and the bottom wall of the machine frame 5 limits the rotation of the adjusting component 3 to limit the horizontal movement of the knot of the yarn 4. Through the setting of the adjusting component 3, it is realized to detect whether the outer diameter of the knot of the yarn 4 is qualified in a mechanical dynamic response manner. Compared with the traditional optical detection method, the detection accuracy is significantly improved. In this embodiment, the knot of the yarn is formed by manually tying the two ends together after the yarn breaks, so the outer diameter of the knot of the yarn will be inconsistent.

[0041] Reference appendix Figure 4, the adjustment assembly 3 includes: a pressure tube 31 sleeved on the outer wall of the positioning tube 2, and a plurality of first water holes 310 are radially formed on the outer wall thereof; the pressure tube 31 is adapted to rotate circumferentially relative to the positioning tube 2. When the pressure tube 31 is squeezed by the yarn 4 or the knot of the yarn 4, the pressure tube 31 is adapted to move downward relative to the positioning tube 2. At this time, the axis of the pressure tube 31 is offset relative to the axis of the positioning tube 2. An extension tube 32, with two extension tubes 32 respectively arranged at both ends of the pressure tube 31, having an inner diameter consistent with that of the pressure tube 31 and an outer diameter smaller than that of the pressure tube 31; the extension tube 32 is integrally provided with the pressure tube 31 and is located inside the fixed tube 21. The thickness of the extension tube 32 is smaller than the gap between the positioning tube 2 and the fixed tube 21. A plurality of flexible members 33 extending along the axial direction of the pressure tube 31, and a plurality of the flexible members 33 are evenly distributed circumferentially along the inner wall of the extension tube 32; wherein, after the yarn 4 passes through between the adjustment assembly 3 and the driving roller 1, the yarn 4 squeezes the pressure tube 31 to move downward; when the pressure tube 31 moves downward, the extension tube 32 squeezes each flexible member 33 located above the positioning tube 2 to be compressed and deformed; so that the water adsorbed in the absorbent strip flows through the flow channel 320 to the first water holes 310, and the first water holes 310 are adapted to adhere the water to the outer wall of the passing yarn 4. Further, the aqueous solution contains 0.5% antistatic agent to avoid static electricity generated during the movement of the yarn 4. If the outer diameter of the knot of the yarn 4 is greater than the descending threshold of the adjustment assembly 3, the bottom wall of the frame 5 limits the rotation of the pressure tube 31. The bottom wall of the frame 5 is provided with a brake block, and the brake block is arc-shaped. When the pressure tube 31 is squeezed downward by the knot block of the yarn 4 and abuts against the brake block, the brake block limits the rotation of the pressure tube 31. At this time, the knot of the yarn 4 cannot pass through the gap between the driving roller 1 and the pressure tube 31, and the yarn 4 stops moving horizontally. A cleaning block is arranged near the brake block of the frame 5, and the cleaning block is adapted to fit the outer wall of the pressure tube 31 to clean the fluff and water on the pressure tube 31.

[0042] Reference appendix Figure 3 , a fixed tube 21 is respectively sleeved at both ends of the outer wall of the positioning tube 2, and a receiving cavity 22 is provided between the fixed tube 21 and the positioning tube 2; the outer diameter of the fixed tube 21 is not greater than the outer diameter of the pressure tube 31; a sealing disc 23 is respectively arranged at both ends of the fixed tube 21. Further, a water inlet pipe is provided on the side wall of the sealing disc 23, and the water inlet pipe is adapted to convey water into the receiving cavity 22. Water is stored in the receiving cavity 22, and the height of the water level 6 is not greater than 1 / 3 of the diameter of the fixed tube 21; wherein, when the pressure tube 31 rotates, each flexible member 33 is successively immersed in water. When the flexible member 33 is immersed in the water level 6, each flexible member 33 resets under the elastic action; as the pressure tube 31 continues to rotate, when the flexible member 33 moves above the positioning tube 2, the extension tube 32 squeezes the flexible member 33 to deform, so that the water in the water absorption strip 331 flows through the flow channel 320 to the first water holes 310.

[0043] Continue to refer to the appendix Figure 4 Moreover, the adjusting assembly 3 further includes a sealing ring 34. The two sealing rings 34 are respectively arranged at the ends of the extension tube 32. The sealing ring 34 is adapted to seal the gap between the fixed tube 21 and the positioning tube 2. The cooperation between the sealing ring 34 and the sealing disc 23 is adapted to seal the accommodating cavity 22 to form a closed chamber. The sealing ring 34 is elastic. When the extension tube 32 moves up and down relative to the positioning tube 2, the sealing ring 34 follows and is compressed or elongated. The sealing ring 34 is adapted to prevent the water in the accommodating cavity 22 from overflowing outward.

[0044] Refer to the appendix Figure 5 Moreover, the flexible member 33 includes: a water-absorbing strip 331, which is rectangular and extends along the axial direction of the extension tube 32; the water-absorbing strip 331 is a water-absorbing sponge with a porosity of 95-97%. A protective sheet 332, whose cross-section is "U"-shaped, with both ends fixed to the inner wall of the extension tube 32, and the water-absorbing strip 331 is located inside the protective sheet 332; the protective sheet 332 is a flexible member. A plurality of second water holes are opened in the protective sheet 332 near the extension tube 32. When the flexible member 33 is immersed in water as a whole, water flows into the water-absorbing strip 331 through the second water holes. The inner wall of the protective sheet 332 is parallel to the outer wall of the positioning tube 2; wherein, when the wire pressing tube 31 is squeezed downward by the yarn 4, the positioning tube 2 squeezes the protective sheet 332 and the water-absorbing strip 331 to be compressed and deformed, so that the water in the water-absorbing strip 331 flows upward through the first water hole 310 to the yarn 4. Figure 5 In this case, F1 represents the downward extrusion force received by the extension tube 32, and this extrusion force is caused by the knot of the yarn 4 squeezing the wire pressing tube 31 downward. The extension tube 32 drives the water-absorbing strip 331 and the protective sheet 332 to abut against the positioning tube 2, and the positioning tube 2 and the extension tube 32 squeeze the water-absorbing strip 331 from both sides, so that the water in the water-absorbing strip 331 flows through the flow channel 320 to the first water hole 310.

[0045] Continue to refer to the appendix Figure 4 Moreover, the extension tube 32 is axially provided with a plurality of flow channels 320, and one flow channel 320 corresponds to one water-absorbing strip 331; the flow channel 320 communicates with the first water hole 310 and the water-absorbing strip 331; the axis of the flow channel 320 forms an inclined angle of 8±0.5° with the axis of the extension tube 32 to guide the water flow to the first water hole 310. Among them, when the protective sheet 332 and the water-absorbing strip 331 are squeezed and deformed, the water in the water-absorbing strip 331 flows through the flow channel 320 to the first water hole 310. The inner wall of the flow channel 320 is provided with a spiral diversion groove, the groove depth is 0.1-0.3mm, and the pitch is 2-3 times the diameter of the flow channel 320. Thereby reducing the flow resistance of the water flow in the flow channel 320.

[0046] At least one embodiment provides a detection method for a detection device. The detection method includes: The yarn 4 moves horizontally after passing between the adjusting assembly 3 and the driving roller 1; If the outer diameter of the knot of the yarn 4 is less than the descending threshold of the adjusting assembly 3, the knot of the yarn 4 is adapted to pass through the gap between the adjusting assembly 3 and the driving roller 1; If the outer diameter of the knot of the yarn 4 is greater than the descending threshold of the adjusting assembly 3, the knot of the yarn 4 presses the adjusting assembly 3 to move downward, and the bottom wall of the frame 5 limits the rotation of the adjusting assembly 3 to limit the horizontal movement of the knot of the yarn 4.

[0047] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" shall be understood in a broad sense. For example, they can be fixedly connected, detachably connected or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be the communication inside two elements. 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 situations.

[0048] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms used herein do not imply an order or sequence unless clearly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section.

[0049] Taking the above-mentioned ideal embodiment according to the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A detecting device for surface defect degree of covered yarn, characterized in that Comprising: A driving roller (1) rotatably arranged on a frame (5) for driving a yarn (4) to move horizontally; A positioning tube (2) arranged parallel to the lower side of the driving roller (1); An adjusting assembly (3) sleeved on the outer wall of the positioning tube (2), abutted against the yarn (4) and adapted to move up and down relative to the positioning tube (2); Wherein, the yarn (4) moves horizontally after passing through between the adjusting assembly (3) and the driving roller (1); If the outer diameter of the knot of the yarn (4) is smaller than the descending threshold value of the adjusting assembly (3), the knot of the yarn (4) is adapted to pass through the gap between the adjusting assembly (3) and the driving roller (1); If the outer diameter of the knot of the yarn (4) is larger than the descending threshold value of the adjusting assembly (3), the knot of the yarn (4) presses the adjusting assembly (3) to move downward, and the bottom wall of the frame (5) limits the rotation of the adjusting assembly (3) to limit the horizontal movement of the knot of the yarn (4).

2. The surface defect degree detection device for covered yarn according to claim 1, characterized in that The adjusting assembly (3) includes: a pressure wire tube (31) sleeved on the outer wall of the positioning tube (2), and a plurality of first water holes (310) are radially opened on the outer wall; Extension tubes (32), two of the extension tubes (32) are respectively arranged at both ends of the pressure wire tube (31), the inner diameter of which is the same as that of the pressure wire tube (31), and the outer diameter is smaller than that of the pressure wire tube (31); A plurality of flexible members (33) extending along the axial direction of the pressure wire tube (31), and the plurality of flexible members (33) are circumferentially distributed along the inner wall of the extension tube (32); Wherein, after the yarn (4) passes through between the adjusting assembly (3) and the driving roller (1), the yarn (4) presses the pressure wire tube (31) to move downward; When the pressure wire tube (31) moves downward, the extension tube (32) presses each flexible member (33) located at the upper part of the positioning tube (2) to be compressed and deformed; If the outer diameter of the knot of the yarn (4) is larger than the descending threshold value of the adjusting assembly (3), the bottom wall of the frame (5) limits the rotation of the pressure wire tube (31).

3. The surface defect degree detection device for covered yarn according to claim 2, characterized in that A fixing tube (21) is respectively sleeved at both ends of the outer wall of the positioning tube (2), and an accommodating cavity (22) is arranged between the fixing tube (21) and the positioning tube (2); The outer diameter of the fixing tube (21) is not larger than the outer diameter of the pressure wire tube (31); A sealing disc (23) is respectively arranged at both ends of the fixing tube (21).

4. The surface defect degree detection device for covered yarn according to claim 3, characterized in that Water is stored in the accommodating cavity (22), and the height of the water level (6) is not greater than 1 / 3 of the diameter of the fixing tube (21); Wherein, when the pressure wire tube (31) rotates, each flexible member (33) is successively immersed in water.

5. The surface defect degree detection device for covered yarn according to claim 3, characterized in that The adjusting assembly (3) further includes a sealing ring (34), and the two sealing rings (34) are respectively arranged at the ends of the extension tube (32), and the sealing ring (34) is adapted to seal the gap between the fixing tube (21) and the positioning tube (2).

6. The surface defect degree detection device for covered yarn according to claim 4, characterized in that the flexible member (33) includes: a water absorption strip (331), which is rectangular and extends along the axial direction of the extension tube (32); a protection sheet (332), the cross section of which is "U" shaped, and both ends are fixed on the inner wall of the extension tube (32), and the water absorption strip (331) is located inside the protection sheet (332); the inner wall of the protection sheet (332) is parallel to the outer wall of the positioning tube (2); wherein, when the pressure tube (31) is extruded downward by the yarn (4) and moves downward, the positioning tube (2) extrudes the protection sheet (332) and the water absorption strip (331) to compress and deform, so that the water in the water absorption strip (331) flows upward through the first water hole (310) to the yarn (4).

7. The surface defect degree detection device for covered yarn according to claim 6, characterized in that a plurality of flow channels (320) are axially formed in the extension tube (32), and one flow channel (320) corresponds to one water absorption strip (331); the flow channel (320) communicates the first water hole (310) and the water absorption strip (331); wherein, when the protection sheet (332) and the water absorption strip (331) are extruded and deformed, the water in the water absorption strip (331) flows through the flow channel (320) to the first water hole (310).

8. The surface defect degree detection device for covered yarn according to claim 6, characterized in that the water absorption strip (331) is a water absorption sponge, and its porosity is 95-97%.

9. The surface defect degree detection device for covered yarn according to claim 7, characterized in that the axis of the flow channel (320) forms an inclined angle of 8±0.5° with the axis of the extension tube (32) to guide the water flow to the first water hole (310).

10. The surface defect degree detection device for covered yarn according to claim 9, characterized in that a spiral diversion groove is provided on the inner wall of the flow channel (320), the groove depth is 0.1-0.3 mm, and the pitch is 2-3 times the diameter of the flow channel (320).

11. A detection method for a detection device, characterized in that, Using the surface defect degree detection device for covered yarn according to any one of claims 1-10, the detection method includes: The yarn (4) horizontally moves after passing through between the adjusting assembly (3) and the driving roller (1); If the outer diameter of the knot of the yarn (4) is less than the descending threshold of the adjusting assembly (3), the knot of the yarn (4) is adapted to pass through the gap between the adjusting assembly (3) and the driving roller (1); If the outer diameter of the knot of the yarn (4) is greater than the descending threshold of the adjusting assembly (3), the knot of the yarn (4) extrudes the adjusting assembly (3) to move downward, and the bottom wall of the frame (5) limits the rotation of the adjusting assembly (3) to limit the horizontal movement of the knot of the yarn (4).

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