Fabric flaw detection equipment

Abstract

The invention discloses fabric flaw detection equipment, belongs to the technical field of flaw detection, and solves the problem that the quality of the processed composite fabric cannot be guaranteed due to the fact that the composite fabric is directly rolled and the quality of the composite fabric before rolling is not identified. Comprising a compound machine, a cloth rolling mechanism, a cloth inspecting mechanism and a switching mechanism, and the switching mechanism, the cloth rolling mechanism and the cloth inspecting mechanism are all located at the discharging end of the compound machine. During discharging of the compound machine, a cloth inspecting mechanism is switched to a working station, fabric is preferentially inspected, the compound fabric penetrates through a guide roller and then is wound around a temporary winding roller, a driving motor drives winding, and in the process, after a thermodynamic diagram, a top view and a bottom view are collected, a data processing module simplifies images, removes colors and only reserves contours, so that the problems of fabric wrinkles, blisters and the like are judged; after confirmation, the air cylinder drives the cutting knife to cut off the fabric, and the cloth rolling mechanism rolls the fabric to keep the quality.

Description

Technical Field

[0001] The invention relates to the technical field of textile production and processing, and in particular to a fabric defect detection device. Background Art

[0002] Composite fabric is a new type of material, which is made by bonding one or more layers of textile materials, non-woven materials and other functional materials. This kind of fabric combines the advantages of different materials, such as waterproof and breathable, radiation-resistant, washable and wear-resistant. In the production process of composite fabric, the fabric and film are squeezed by the glue roller in the gluing device to transfer the glue to the fabric, and then pressed by the composite device to form a preliminary bond. The maintenance treatment time of composite fabric has a great influence on its bonding strength and the degree of fusion of adhesives. It needs to be carried out under a certain temperature and humidity to ensure the natural fusion of adhesives. Composite fabrics are widely used in clothing, home decoration, vehicle interior and industrial fields, and are favored by the market for their diverse performance and uses.

[0003] At present, there are relatively mature existing technologies for the composite processing of fabrics, that is, a composite machine is used to perform the composite action between fabrics, and the production and processing requirements of the composite fabrics are completed through a combination of gluing and pressurizing. Generally speaking, the composite fabric leaving the composite machine can be directly wound up by a fabric winding mechanism. For example, a special composite fabric and its production equipment with application number 202010641231.6, the technical points of which are as follows: it includes a workbench, a feeding assembly is provided at one end of the workbench, and a transfer roller is provided at the top of the workbench, and a supporting leg is provided at the bottom end of the workbench, a gluing assembly is provided at one end of the transfer roller close to the feeding assembly, and a first pressing assembly is provided at one end of the transfer roller away from the gluing assembly, a second pressing assembly is provided at one end of the first pressing assembly away from the transfer roller, a side pressing assembly is provided at one end of the second pressing assembly away from the first pressing assembly, and a receiving roller is provided at one end of the side pressing assembly away from the second pressing assembly, and a composite fabric is provided on the feeding assembly.

[0004] The above scheme rolls up the pressed composite fabric on the receiving roller, which is a type of directly rolling up the composite fabric, and does not perform quality identification on the composite fabric before rolling up. At the same time, the composite fabric that is directly rolled up is also unlikely to perform quality identification when it actually leaves the factory. Therefore, the quality of the processed composite fabric cannot be guaranteed.

[0005] Therefore, a fabric defect detection device is proposed to solve or alleviate the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a fabric defect detection device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A fabric defect detection device comprises a compound machine, a cloth rolling mechanism, a cloth inspection mechanism, and a switching mechanism, wherein the switching mechanism, the cloth rolling mechanism, and the cloth inspection mechanism are all located at the discharge end of the compound machine, the switching mechanism has a first active position and a second active position, the switching mechanism has a working station arranged opposite to the discharge end of the compound machine, the switching mechanism is used to switch the first active position or the second active position to be located at the working station, and the cloth rolling mechanism and the cloth inspection mechanism are respectively arranged at the first active position and the second active position, the cloth rolling mechanism is used to rewind the composite fabric leaving the discharge end of the compound machine, and the cloth inspection mechanism is used to inspect the composite fabric leaving the discharge end of the compound machine and feed back the result.

[0008] Preferably, the switching mechanism includes a slide rail and a rail flatbed trolley slidably connected to the slide rail, the cargo plate of the rail flatbed trolley is in the shape of an elongated strip, the first active position and the second active position are respectively located at the two ends of the cargo plate of the rail flatbed trolley, and the working position is the position when the first active position or the second active position is facing the discharge end of the compound machine.

[0009] Preferably, the cloth inspecting mechanism includes a frame, a first guide roller, a second guide roller, a third guide roller and a fourth guide roller rotatably connected to the frame, a cutting assembly arranged on the frame and located between the second guide roller and the third guide roller, a mounting frame arranged on the frame and located between the third guide roller and the fourth guide roller, and a temporary rolling assembly, an upper connecting plate and a lower connecting plate are fixedly connected between the mounting frames on both sides, the horizontal height of the upper connecting plate is greater than the horizontal height of the third guide roller and the fourth guide roller, and the horizontal height of the lower connecting plate is lower than the horizontal height of the third guide roller and the fourth guide roller.

[0010] Preferably, the cutting assembly includes two groups of mounting slides fixedly connected to the frame and arranged vertically, a cylinder fixedly connected vertically downward in the mounting slide, a slide fixedly connected to the movable end of the cylinder and slidably connected in the mounting slide, a clamp arranged on the slide, and a cutting knife installed between the slides on both sides through the clamp and arranged with the blade facing downward.

[0011] Preferably, the temporary winding assembly includes two groups of bearing seats fixedly connected to the frame, a rotating shaft with both ends fixedly connected to the inner rings of the two groups of bearing seats, a temporary winding roller fixedly connected to the outer ring of the rotating shaft, a driving motor fixedly connected to the frame, a driving wheel coaxially fixedly connected to the output shaft of the driving motor, a driven wheel coaxially fixedly connected to one end of the rotating shaft, and a transmission belt connecting the driving wheel and the driven wheel.

[0012] Preferably, it also includes a defect detection system, which includes an upper image acquisition module, a lower image acquisition module, and a thermal map acquisition module. The upper image acquisition module is installed on the bottom surface of the upper connecting plate, and the lower image acquisition module and the thermal map acquisition module are both installed on the top surface of the lower connecting plate. The defect detection system also includes a data processing module, and the output ends of the upper image acquisition module, the lower image acquisition module, and the thermal map acquisition module are all coupled to the input end of the data processing module. The upper image acquisition module is used to acquire a top view of the composite fabric and transmit it to the data processing module, the lower image acquisition module is used to acquire a bottom view of the composite fabric and transmit it to the data processing module, and the thermal map acquisition module is used to acquire a thermal map of the composite fabric and transmit it to the data processing module. The data processing module identifies surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifies glue layer problems in the composite fabric according to the thermal map, the top view, and the bottom view.

[0013] Preferably, the adhesive layer problems include peeling problems, bubbling problems, and coating missing problems.

[0014] Preferably, the data processing module identifies surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifies glue layer problems in the composite fabric according to the thermal map, the top view and the bottom view, including the following steps: Convert the top and bottom views into grayscale images and smooth them using a Gaussian filter; For each pixel in the top view and bottom view , using the surrounding neighborhood pixels to generate a binary pattern, assuming that the neighborhood of each pixel is P pixels, ,in, is a binary function, if ,but , otherwise it is 0. is the pixel value in the neighborhood, and p is the value of the current pixel; The gradient, gradient magnitude and gradient direction of the top view and bottom view are calculated by edge detection algorithm; Along the gradient direction, the gradient amplitude is suppressed and the local maximum value is retained; Use two thresholds to classify edges and determine strong and weak edges; According to the connectivity of strong edges and weak edges, weak edges are connected to strong edges to obtain edge graphs of top view and bottom view; Use Fourier transform to perform frequency domain analysis on the top view and bottom view to detect whether there is significant periodic fluctuation. If there are periodic fluctuations, the Fourier transform will form obvious peaks in the low-frequency region; Use optical flow to detect local deformations in top and bottom views. Where u and v are the horizontal and vertical components of the optical flow field, , , is the gradient of the top view and bottom view in the x, y, and t directions; The scores of texture, gradient, fluctuation and local deformation are combined by weighted average. ,in, , , , is the weight of each feature; Set the score threshold. If If the score is greater than the threshold, the output result is that there is surface deformation and wrinkles. Otherwise, the output result is that there is no surface deformation and wrinkles.

[0015] Preferably, the data processing module identifies surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifies glue layer problems in the composite fabric according to the thermal map, the top view and the bottom view, and also includes the following steps: The contour detection algorithm is used to traverse the edge pixels in the edge map and identify each closed contour according to the connectivity of the pixels; And for each pixel Set the binarization threshold T, if If it is greater than T, it is set to white, otherwise it is set to black, and the binary images of the top view and bottom view are output; Convert the heat map to grayscale and smooth it through Gaussian filter; The processed heat map is subjected to edge detection algorithm to obtain the horizontal and vertical gradients. ,in, is the Sobel convolution kernel in the horizontal direction, Vertical gradient ,in, is the Sobel convolution kernel in the vertical direction, , calculate the gradient amplitude of each pixel ; The processed thermal map is binarized for a set gradient amplitude threshold to obtain a binary image of the thermal map; The binary image of the thermal map, the binary images of the top view and the bottom view are converted into pixel matrices and filtered by subtraction to obtain a filtered binary image; The contours in the filtered binary image are extracted by a contour extraction algorithm and a pixel set of each contour is obtained; Set the contour area threshold, calculate the area of ​​each contour through the pixel set of each contour and compare it with the contour area threshold. If the area of ​​the contour is greater than the contour area threshold, the output result is that there is a problem of falling off, bubbling, or smearing. Otherwise, the output result is that there is no problem of falling off, bubbling, or smearing.

[0016] Preferably, the cloth rolling mechanism includes a cloth rolling machine, the upper image acquisition module and the lower image acquisition module both include cameras, the thermal map acquisition module includes a thermal imager, and the data processing module includes a processor.

[0017] The present invention has the following beneficial effects: The present invention can complete the inspection and winding actions of the composite fabric at the same time as the composite fabric is produced. When the composite fabric is output from the discharge end of the composite machine, the inspection mechanism is adjusted to the working position through the switching mechanism to ensure that the composite fabric can immediately enter the inspection process. After the composite fabric passes through a series of guide rollers, it is wound on the temporary winding roller for winding; While winding, the thermal map acquisition module can capture the thermal map of the composite fabric because the composite fabric still retains the heat of the composite machine. In addition, the upper and lower image acquisition modules respectively obtain the top view and bottom view of the composite fabric. These images are then transmitted to the data processing module for processing, removing the color and retaining only the lines and contours to reduce interference with wrinkle and deformation judgment. The top view and bottom view are used to detect deformation and wrinkles on the fabric surface, while the thermal map is used to identify problems such as blistering, shedding and uneven coating. By eliminating the influence of the fabric layer on the thermal map, the glue layer condition can be more accurately evaluated, providing reliable reference data for operators; Once the inspection is completed and the composite fabric is confirmed to be free of defects, the cylinder will drive the slide and the clamp to lower the cutting knife to cut the composite fabric. In this way, the operator does not need to manually unwind, but directly moves the cloth winding mechanism to the working position through the switching mechanism, winds the cut composite fabric onto the cloth winding machine, completes the winding, and ensures the quality of the wound fabric. This process not only improves efficiency, but also ensures the consistency of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural block diagram of the present invention; Figure 2 It is a structural schematic diagram of the cloth inspection mechanism in the present invention; Figure 3 It is a structural block diagram of the defect detection system in the present invention.

[0020] In the figure: 1. compound machine; 2. cloth winding mechanism; 3. cloth inspection mechanism; 301. frame; 302. first guide roller; 303. second guide roller; 3041. mounting slide; 3042. cylinder; 3043. slide seat; 3044. fixture; 3045. cutting knife; 305. third guide roller; 3061. mounting frame; 3062. upper connecting plate; 3063. lower connecting plate; 307. fourth guide roller; 3081. bearing seat; 3082. temporary winding roller; 3083. driven wheel; 3084. driving motor; 3085. driving wheel; 3086. transmission belt; 4. upper image acquisition module; 5. lower image acquisition module; 6. thermal map acquisition module; 7. data processing module. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the invention is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] A fabric defect detection device, such as Figure 1 As shown, it includes a compound machine 1, a cloth rolling mechanism 2, a cloth inspection mechanism 3, and a switching mechanism. The switching mechanism, the cloth rolling mechanism 2 and the cloth inspection mechanism 3 are all located at the discharge end of the compound machine 1. There are a first active position and a second active position on the switching mechanism. There is a working station arranged opposite the discharge end of the compound machine 1 on the switching mechanism. The switching mechanism is used to switch the first active position or the second active position to be located at the working station, and the cloth rolling mechanism 2 and the cloth inspection mechanism 3 are respectively arranged at the first active position and the second active position. The cloth rolling mechanism 2 is used to rewind the composite fabric leaving the discharge end of the compound machine 1, and the cloth inspection mechanism 3 is used to detect the composite fabric leaving the discharge end of the compound machine 1 and feedback the result.

[0028] Preferably, the cloth winding mechanism 2 includes a cloth winding machine, the switching mechanism includes a slide rail, and a rail flatbed trolley slidably connected to the slide rail, the cargo plate of the rail flatbed trolley is in the shape of an elongated strip, the first active position and the second active position are respectively located at the two ends of the cargo plate of the rail flatbed trolley, and the working position is the position when the first active position or the second active position is facing the discharge end of the compound machine 1.

[0029] Preferably, if Figure 2 As shown, the cloth inspection mechanism 3 includes a frame 301, a first guide roller 302, a second guide roller 303, a third guide roller 305 and a fourth guide roller 307 rotatably connected to the frame 301, a cutting assembly arranged on the frame 301 and located between the second guide roller 303 and the third guide roller 305, a mounting frame 3061 arranged on the frame 301 and located between the third guide roller 305 and the fourth guide roller 307, and a temporary rolling assembly, an upper connecting plate 3062 and a lower connecting plate 3063 are fixedly connected between the mounting frames 3061 on both sides, the horizontal height of the upper connecting plate 3062 is greater than the horizontal height of the third guide roller 305 and the fourth guide roller 307, and the horizontal height of the lower connecting plate 3063 is lower than the horizontal height of the third guide roller 305 and the fourth guide roller 307.

[0030] The cutting assembly includes two groups of mounting slides 3041 fixedly connected to the frame 301 and arranged vertically, a cylinder 3042 fixedly connected vertically downward in the mounting slide 3041, a slide 3043 fixedly connected to the movable end of the cylinder 3042 and slidably connected in the mounting slide 3041, a clamp 3044 arranged on the slide 3043, and a cutting knife 3045 installed between the two side slides 3043 through the clamp 3044 and arranged with the blade facing downward.

[0031] The temporary winding assembly includes two groups of bearing seats 3081 fixedly connected to the frame 301, a rotating shaft with both ends fixedly connected to the inner rings of the two groups of bearing seats 3081, a temporary winding roller 3082 fixedly connected to the outer ring of the rotating shaft, a driving motor 3084 fixedly connected to the frame 301, a driving wheel 3085 coaxially fixedly connected to the output shaft of the driving motor 3084, a driven wheel 3083 coaxially fixedly connected to one end of the rotating shaft, and a transmission belt 3086 that transmits and connects the driving wheel 3085 and the driven wheel 3083.

[0032] Preferably, if Figure 3 As shown, it also includes a defect detection system, which includes an upper image acquisition module 4, a lower image acquisition module 5, and a thermal map acquisition module 6. The upper image acquisition module 4 is installed on the bottom surface of the upper connecting plate 3062, and the lower image acquisition module 5 and the thermal map acquisition module 6 are both installed on the top surface of the lower connecting plate 3063. The defect detection system also includes a data processing module 7. The output ends of the upper image acquisition module 4, the lower image acquisition module 5, and the thermal map acquisition module 6 are all coupled to the input end of the data processing module 7. The upper image acquisition module 4 is used to collect a top view of the composite fabric and transmit it to the data processing module Block 7, the lower image acquisition module 5 is used to acquire the top view of the composite fabric and transmit it to the data processing module 7, the thermal map acquisition module 6 is used to acquire the thermal map of the composite fabric and transmit it to the data processing module 7, the data processing module 7 identifies the surface deformation and wrinkles according to the top view and the top view, and comprehensively identifies the glue layer problems in the composite fabric according to the thermal map, the top view and the top view. The glue layer problems include falling problems, blistering problems, and smear missing problems. The upper image acquisition module 4 and the lower image acquisition module 5 both include cameras, the thermal map acquisition module 6 includes a thermal imager, and the data processing module 7 includes a processor.

[0033] Preferably, the data processing module 7 identifies surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifies glue layer problems in the composite fabric according to the thermal map, the top view and the bottom view, including the following steps: Convert the top and bottom views into grayscale images and smooth them using a Gaussian filter; For each pixel in the top view and bottom view , using the surrounding neighborhood pixels to generate a binary pattern, assuming that the neighborhood of each pixel is P pixels, ,in, is a binary function, if ,but , otherwise it is 0. is the pixel value in the neighborhood, and p is the value of the current pixel; The gradient, gradient magnitude and gradient direction of the top view and bottom view are calculated by edge detection algorithm; Along the gradient direction, the gradient amplitude is suppressed and the local maximum value is retained; Use two thresholds to classify edges and determine strong and weak edges; According to the connectivity of strong edges and weak edges, weak edges are connected to strong edges to obtain edge graphs of top view and bottom view; Use Fourier transform to perform frequency domain analysis on the top view and bottom view to detect whether there is significant periodic fluctuation. ,If there are periodic fluctuations, the Fourier transform will form an obvious peak in the low-frequency region; Use optical flow to detect local deformations in top and bottom views. , where u and v are the horizontal and vertical components of the optical flow field, , , is the gradient of the top view and bottom view in the x, y, and t directions; The scores of texture, gradient, fluctuation and local deformation are combined by weighted average. ,in, , , , is the weight of each feature; Set the score threshold. If If the score is greater than the threshold, the output result is that there is surface deformation and wrinkles, otherwise, the output result is that there is no surface deformation and wrinkles. Preferably, the data processing module 7 identifies the surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifies the glue layer problem in the composite fabric according to the thermal map, the top view and the bottom view, and also includes the following steps: The contour detection algorithm is used to traverse the edge pixels in the edge map and identify each closed contour according to the connectivity of the pixels; And for each pixel Set the binarization threshold T, if If it is greater than T, it is set to white, otherwise it is set to black, and the binary images of the top view and bottom view are output; Convert the heat map to grayscale and smooth it through Gaussian filter; The processed heat map is subjected to edge detection algorithm to obtain the horizontal and vertical gradients. ,in, is the Sobel convolution kernel in the horizontal direction, , the vertical gradient ,in, is the Sobel convolution kernel in the vertical direction, , calculate the gradient amplitude of each pixel ; Set the gradient amplitude threshold, perform binarization on the processed thermal map, and obtain a binary image of the thermal map; The binary image of the thermal map, the binary images of the top view and the bottom view are converted into pixel matrices and filtered by subtraction to obtain a filtered binary image; The contours in the filtered binary image are extracted by a contour extraction algorithm and a pixel set of each contour is obtained; Set the contour area threshold, calculate the area of ​​each contour through the pixel set of each contour and compare it with the contour area threshold. If the area of ​​the contour is greater than the contour area threshold, the output result is that there is a problem of falling off, bubbling, or smearing. Otherwise, the output result is that there is no problem of falling off, bubbling, or smearing.

[0034] The present invention can switch the fabric inspection mechanism 3 to the working station when the composite fabric leaves the discharge end of the composite machine 1, so that the composite fabric leaving the discharge end of the composite machine 1 can be inspected first, and when inspecting the fabric, the composite fabric needs to pass through the first guide roller 302, the second guide roller 303, the third guide roller 305, and the fourth guide roller 307, and then be wound around the outer ring of the temporary winding roller 3082, and by starting the driving motor 3084, the driving motor 3084 can drive the rotating shaft and the temporary winding roller 3082 to wind up the composite fabric through the driving wheel 3085, the transmission belt 3086, and the driven wheel 3083; In addition, during the winding process, since the composite fabric has just left the discharging end of the composite machine 1, the composite fabric still retains a certain amount of heat. After being photographed by the thermal map acquisition module 6, a thermal map of the composite fabric can be obtained, and the upper image acquisition module 4 and the lower image acquisition module 5 respectively photograph the top view and bottom view of the composite fabric, and the thermal map, the top view, and the bottom view are transmitted to the data processing module 7; The data processing module 7 simplifies the thermal map, the top view, and the bottom view, removes the colors therein, and retains only the outline of the lines, thereby reducing the influence of the picture on the judgment of whether there is wrinkle deformation. The top view and the bottom view can be used to judge whether there is deformation and wrinkle problems on the surface of the composite fabric. The thermal map can judge whether there is blistering, shedding, smearing and missing due to the heat of the composite fabric. After removing the influence of the fabric layer in the top view and the bottom view from the thermal map, the thermal map can more accurately judge the condition of the glue layer in the composite fabric, so that a relatively accurate result can be output in the end for reference by production operators. After finishing the cloth inspection work of the cloth inspection mechanism 3 and confirming that there is no problem with the composite fabric, the cylinder 3042 can be arranged to work, driving the slide 3043 to move in the installation slide 3041, so that the slide 3043 drives the cutting knife 3045 to move downward through the clamp 3044 to cut the composite fabric. In this way, the operator no longer needs to unwind from the temporary winding roller 3082, but can directly switch through the switching mechanism, so that the cloth winding mechanism 2 can reach the working station, and then the cut composite fabric is wound on the cloth winding mechanism 2 of the cloth winding machine, so that it completes the winding action of the composite fabric, so that the wound composite fabric can maintain good quality.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fabric defect detection device, characterized in that: The invention comprises a composite machine (1), a cloth rolling mechanism (2), a cloth inspection mechanism (3), and a switching mechanism, wherein the switching mechanism, the cloth rolling mechanism (2), and the cloth inspection mechanism (3) are all located at the discharge end of the composite machine (1), the switching mechanism has a first active position and a second active position, the switching mechanism has a working position arranged opposite to the discharge end of the composite machine (1), the switching mechanism is used to switch the first active position or the second active position to be located at the working position, and the cloth rolling mechanism (2) and the cloth inspection mechanism (3) are respectively arranged at the first active position and the second active position, the cloth rolling mechanism (2) is used to rewind the composite fabric leaving the discharge end of the composite machine (1), and the cloth inspection mechanism (3) is used to detect the composite fabric leaving the discharge end of the composite machine (1) and to feed back the result.

2. A fabric defect detection device according to claim 1, characterized in that: The switching mechanism comprises a slide rail and a rail flatbed trolley slidably connected to the slide rail, the cargo board of the rail flatbed trolley is in the shape of an elongated strip, the first movable position and the second movable position are respectively located at the two end positions of the cargo board of the rail flatbed trolley, and the working position is the position when the first movable position or the second movable position is directly opposite to the discharge end of the compound machine (1).

3. The fabric defect detection device according to claim 1, characterized in that: The cloth inspection mechanism (3) comprises a frame (301), a first guide roller (302) rotatably connected to the frame (301), a second guide roller (303), a third guide roller (305) and a fourth guide roller (307), a cutting assembly arranged on the frame (301) and located between the second guide roller (303) and the third guide roller (305), a mounting frame (3061) arranged on the frame (301) and located between the third guide roller (305) and the fourth guide roller (307), and a temporary winding assembly, wherein an upper connecting plate (3062) and a lower connecting plate (3063) are fixedly connected between the mounting frames (3061) on both sides, the horizontal height of the upper connecting plate (3062) being greater than the horizontal height of the third guide roller (305) and the fourth guide roller (307), and the horizontal height of the lower connecting plate (3063) being lower than the horizontal height of the third guide roller (305) and the fourth guide roller (307).

4. A fabric defect detection device according to claim 3, characterized in that: The cutting assembly comprises two groups of mounting slides (3041) fixedly connected to the frame (301) and arranged vertically, a cylinder (3042) fixedly connected vertically downward in the mounting slide (3041), a slide seat (3043) fixedly connected to the movable end of the cylinder (3042) and slidably connected in the mounting slide (3041), a clamp (3044) arranged on the slide seat (3043), and a cutting knife (3045) installed between the slide seats (3043) on both sides through the clamp (3044) and arranged with the blade face downward.

5. The fabric defect detection device according to claim 3, characterized in that: The temporary winding assembly comprises two groups of bearing seats (3081) fixedly connected to a frame (301), a rotating shaft with two ends respectively fixedly connected to the inner rings of the two groups of bearing seats (3081), a temporary winding roller (3082) fixedly connected to the outer ring of the rotating shaft, a driving motor (3084) fixedly connected to the frame (301), a driving wheel (3085) coaxially fixedly connected to the output shaft of the driving motor (3084), a driven wheel (3083) coaxially fixedly connected to one end of the rotating shaft, and a transmission belt (3086) connecting the driving wheel (3085) and the driven wheel (3083).

6. The fabric defect detection device according to claim 3, characterized in that: The defect detection system also includes an upper image acquisition module (4), a lower image acquisition module (5), and a thermal map acquisition module (6), wherein the upper image acquisition module (4) is mounted on the bottom surface of the upper connecting plate (3062), and the lower image acquisition module (5) and the thermal map acquisition module (6) are both mounted on the top surface of the lower connecting plate (3063). The defect detection system also includes a data processing module (7), and the output ends of the upper image acquisition module (4), the lower image acquisition module (5), and the thermal map acquisition module (6) are all connected to the data processing module (7). The processing module (7) is coupled to the input end thereof, the upper image acquisition module (4) being used to acquire a top view of the composite fabric and transmit it to the data processing module (7), the lower image acquisition module (5) being used to acquire a bottom view of the composite fabric and transmit it to the data processing module (7), the thermal map acquisition module (6) being used to acquire a thermal map of the composite fabric and transmit it to the data processing module (7), the data processing module (7) identifying surface deformation and wrinkles according to the top view and the bottom view, and comprehensively identifying glue layer problems in the composite fabric according to the thermal map, the top view and the bottom view.

7. A fabric defect detection device according to claim 6, characterized in that: The adhesive layer problems include peeling problem, bubbling problem and coating missing problem.

8. The fabric defect detection device according to claim 6, characterized in that: The data processing module (7) identifies surface deformation and wrinkles based on the top view and the bottom view, and comprehensively identifies adhesive layer problems in the composite fabric based on the thermal map, the top view and the bottom view, including the following steps: Convert the top and bottom views into grayscale images and smooth them using a Gaussian filter; For each pixel in the top view and bottom view , using the surrounding neighborhood pixels to generate a binary pattern, assuming that the neighborhood of each pixel is P pixels, ,in, is a binary function, if ,but , otherwise it is 0. is the pixel value in the neighborhood, and p is the value of the current pixel; The gradient, gradient magnitude and gradient direction of the top view and bottom view are calculated by edge detection algorithm; Along the gradient direction, the gradient amplitude is suppressed and the local maximum value is retained; Use two thresholds to classify edges and determine strong and weak edges; According to the connectivity of strong edges and weak edges, weak edges are connected to strong edges to obtain edge graphs of top view and bottom view; Use Fourier transform to perform frequency domain analysis on the top view and bottom view to detect whether there is significant periodic fluctuation. ,If there are periodic fluctuations, the Fourier transform will form an obvious peak in the low-frequency region; Use optical flow to detect local deformations in top and bottom views. , where u and v are the horizontal and vertical components of the optical flow field, , , is the gradient of the top view and bottom view in the x, y, and t directions; The scores of texture, gradient, fluctuation and local deformation are combined by weighted average. ,in, , , , is the weight of each feature; Set the score threshold. If If the score is greater than the threshold, the output result is that there is surface deformation and wrinkles. Otherwise, the output result is that there is no surface deformation and wrinkles.

9. A fabric defect detection device according to claim 8, characterized in that: The data processing module (7) identifies surface deformation and wrinkles based on the top view and the bottom view, and comprehensively identifies glue layer problems in the composite fabric based on the thermal map, the top view and the bottom view, and also includes the following steps: using a contour detection algorithm to traverse edge pixels in the edge map and identify each closed contour according to pixel connectivity; And for each pixel Set the binarization threshold T, if If it is greater than T, it is set to white, otherwise it is set to black, and the binary images of the top view and bottom view are output; Convert the heat map to grayscale and smooth it through Gaussian filter; The processed heat map is subjected to edge detection algorithm to obtain the horizontal and vertical gradients. ,in, is the Sobel convolution kernel in the horizontal direction, , the vertical gradient ,in, is the Sobel convolution kernel in the vertical direction, , calculate the gradient amplitude of each pixel ; The processed thermal map is binarized for a set gradient amplitude threshold to obtain a binary image of the thermal map; The binary image of the thermal map, the binary images of the top view and the bottom view are converted into pixel matrices and filtered by subtraction to obtain a filtered binary image; The contours in the filtered binary image are extracted by a contour extraction algorithm and a pixel set of each contour is obtained; Set the contour area threshold, calculate the area of ​​each contour through the pixel set of each contour and compare it with the contour area threshold. If the area of ​​the contour is greater than the contour area threshold, the output result is that there is a problem of falling off, bubbling, or smearing. Otherwise, the output result is that there is no problem of falling off, bubbling, or smearing.

10. The fabric defect detection device according to claim 6, characterized in that: The cloth rolling mechanism (2) comprises a cloth rolling machine, the upper image acquisition module (4) and the lower image acquisition module (5) both comprise cameras, the thermal image acquisition module (6) comprises a thermal imager, and the data processing module (7) comprises a processor.

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