An online defect detection device for double-sided weft knitted machine fabric

Abstract

The present invention relates to the technical field of circular knitting machines, and in particular to an online detection device for fabric defects of a double-sided weft knitting machine, wherein an inner camera bracket is mounted on a central blowing rod and is located inside a cloth support frame, and the cloth support frame is located inside the fabric; a first inner camera and a second inner camera are symmetrically mounted on the inner camera bracket with the central blowing rod as a symmetry axis, and the field of view of the first inner camera and the field of view of the second inner camera at least partially overlap; an outer camera bracket is fixedly mounted on a large plate and is located outside the fabric and a driving arm, and the driving arm is located outside the fabric; a first outer camera and a second outer camera are symmetrically mounted on the outer camera bracket with the central blowing rod as a symmetry axis, and the field of view of the first outer camera and the field of view of the second outer camera at least partially overlap, and the cloth support frame and the driving arm are rotatably arranged with the central blowing rod as a rotating axis. The present invention solves the problem that it is difficult to realize online detection of fabric defects based on existing equipment.

Description

Technical Field

[0001] The invention relates to the technical field of circular knitting machines, and in particular to an online defect detection device for double-sided weft knitting machine fabrics. Background Art

[0002] Fabric defect detection is an important part of fabric quality control. Traditional fabric defect detection is performed manually after the fabric is off the machine. Manual detection is not only time-consuming and laborious, but also has high missed detection rate and false detection rate. In recent years, with the rapid development of industrial automation and digital image processing technology, traditional manual detection of fabric defects can no longer meet the needs of today's textile industry. An efficient real-time online detection system for fabric defects has replaced the traditional manual detection of fabric defect classification accuracy and efficiency. However, most of the existing online detection devices for fabric defects of double-sided weft knitting machines adopt the solution of adding cameras to the fabric cutting machine. This solution either requires multiple cameras or requires a slide rail to install a mobile camera. Regardless of whether multiple cameras are added or a slide rail is used to install a mobile camera, the height of the fabric cutting machine and the minimum allowable rotation diameter must be increased. In this way, the frame must be made higher and larger to accommodate a larger size of the fabric cutting machine. This greatly increases the investment cost, making it difficult to realize online detection of fabric defects on the basis of existing equipment, which is not conducive to the popularization of online detection technology for fabric defects.

[0003] Therefore, it is necessary to propose an online detection device for double-sided weft knitting machine fabric defects, which is convenient for realizing online detection of fabric defects and intelligent transformation of equipment without changing the main structure of the equipment. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an online defect detection device for double-sided weft knitted machine fabrics.

[0005] In order to achieve the above purpose, the technical solution of the present invention is:

[0006] A double-sided weft knitting machine fabric defect online detection device comprises a central blowing rod, an inner camera bracket, a first inner camera, a second inner camera, a cloth support frame, two driving arms, a large plate, an outer camera bracket, a first outer camera, a second outer camera and fabric, wherein the inner camera bracket is mounted on the central blowing rod and is located inside the cloth support frame, and the cloth support frame is located inside the fabric; the first inner camera and the second inner camera are symmetrically mounted on the inner camera bracket with the central blowing rod as a symmetry axis, the visual field of the first inner camera is a first area, the visual field of the second inner camera is a second area, and the first area and the second area at least partially overlap; the outer camera bracket is fixedly mounted on the large plate and is located outside the fabric and the driving arm, and the driving arm is located outside the fabric; the first outer camera and the second outer camera are symmetrically mounted on the outer camera bracket with the central blowing rod as a symmetry axis, the visual field of the first outer camera is a third area, the visual field of the second outer camera is a fourth area, the third area and the fourth area at least partially overlap, and the cloth support frame and the driving arm are rotatably arranged with the central blowing rod as a rotating axis.

[0007] Preferably, the distance between the center position of the first internal camera or the second internal camera and the center position of the central blowing rod is adjustable between a first distance and a second distance, the first distance is smaller than the second distance, and the value of the first distance is:

[0008] ;

[0009] The horizontal plane where the center positions of the first internal camera and the second internal camera are located is the first horizontal plane, r represents the distance between the fabric and the center position of the central blowing rod in the first horizontal plane, and L represents half of the arc length of the overlapping part of the first area and the second area in the first horizontal plane. It represents the distance between the first side of the cross section of the vertical frame of the cloth support frame and the center position of the central blowing rod in the first horizontal plane, It represents half of the cross-sectional length of the vertical frame of the cloth support frame in the first horizontal plane. represents the first distance;

[0010] The value of the second distance is Difference from the camera width.

[0011] Preferably, the vertical plane where the center position of the central blowing rod and the center position of the vertical frame section of the cloth supporting frame are located is the first vertical plane, the vertical plane where the edge of the first area blocked by the cloth supporting frame and away from the second internal camera is located is the second vertical plane, and the intersection of the first vertical plane and the second vertical plane is the first intersection; the vertical plane where the edge of the second area close to the first internal camera is located is the third vertical plane, and the intersection of the third vertical plane and the fabric is the second intersection; when the distance between the center position of the first internal camera and the center position of the central blowing rod is equal to the first distance and the first intersection is located on the surface of the fabric, the arc length of the fabric intercepted by the first intersection and the second intersection is 1.5 times the length of the vertical frame section of the cloth supporting frame.

[0012] Preferably, the overlapping area of ​​the third area and the fourth area is located inside the driving arm.

[0013] Preferably, the horizontal plane where the centers of the first external camera and the second external camera are located is the second horizontal plane, and in the second horizontal plane, the distance between the external camera bracket and the fabric is greater than twice the distance between the second side of the driving arm cross section and the fabric.

[0014] Preferably, the distance between the center positions of the first external camera and the second external camera is adjustable between a third distance and a fourth distance, the third distance is smaller than the fourth distance, and the value of the third distance is:

[0015] ;

[0016] in, represents the distance between the second side of the driving arm cross section and the fabric in the second horizontal plane, represents half of the cross-sectional length of the driving arm in the second horizontal plane, Indicates the distance between the internal and external camera bracket and the fabric in the second horizontal plane, Indicates the third distance;

[0017] The value of the fourth distance is:

[0018] ;

[0019] in, Indicates the fourth distance.

[0020] Preferably, the external camera bracket is installed on the large plate with the central blowing rod as the symmetry axis, and on the external camera bracket, the distance between the middle part of the external camera bracket and the fabric is the shortest.

[0021] Preferably, the internal camera bracket is rotatably set with the central blowing rod between a first position and a second position. When the internal camera bracket is in the first position, the internal camera bracket is vertically set to the external camera bracket, and the shooting direction of the first internal camera and the second internal camera is the first direction; when the internal camera bracket is in the second position, the internal camera bracket is vertically set to the external camera bracket, and the shooting direction of the first internal camera and the second internal camera is the second direction.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The double-sided weft knitting machine fabric defect online detection device proposed in the present application is based on the existing equipment. By adding an internal camera bracket and an external camera bracket for installing cameras on the central blowing rod and the large plate respectively, the fabric defect online detection can be realized without changing the main structure of the equipment, which is convenient for the intelligent transformation of the equipment and is conducive to the popularization of the fabric defect online detection technology.

[0024] (2) The present application proposes an online defect detection device for double-sided weft knitted machine fabrics, which overcomes the detection problem caused by being blocked by a cloth support frame or a driving arm by arranging two cameras on the inside and outside of the fabric respectively, through the overlapping area of ​​the field of view of the two cameras.

[0025] (3) In the online defect detection device for double-sided weft knitted machine fabric proposed in the present application, the overlapping area between the field of view of the first internal camera and the field of view of the second internal camera, and the overlapping area between the field of view of the first external camera and the field of view of the second external camera do not intersect, so as to ensure that the first internal camera, the second internal camera, the first external camera and the second external camera can all obtain high-quality fabric images. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the overall structure of the double-sided weft knitting machine.

[0027] Figure 2 It is a partial structural front view of a double-sided weft knitting machine.

[0028] Figure 3 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to the first embodiment Figure 1 .

[0029] Figure 4 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to the first embodiment Figure 2 .

[0030] Figure 5 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to the first embodiment Figure 3 .

[0031] Figure 6 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to the second embodiment Figure 1 .

[0032] Figure 7 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to the second embodiment Figure 2 .

[0033] Figure 8 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to Embodiment 3 Figure 1 .

[0034] Fig. 9 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to Embodiment 3 Figure 2 .

[0035] Fig.10 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to Embodiment 3 Figure 3 .

[0036] Fig.11 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to a fourth embodiment Figure 1 .

[0037] Fig.12 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to a fourth embodiment Figure 2 .

[0038] Fig.13 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to a fourth embodiment Figure 3 .

[0039] Fig.14 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to a fifth embodiment Figure 1 .

[0040] Fig.15 A schematic diagram of a partial structural cross section of a double-sided weft knitting machine in a first horizontal plane according to a fifth embodiment Figure 2 .

[0041] Fig.16 It is a partial structural cross-sectional schematic diagram of a double-sided weft knitting machine in a first horizontal plane according to a sixth embodiment.

[0042] Fig.17 It is a schematic diagram of a partial structural cross-section of a double-sided weft knitting machine when the inner camera bracket is in the first position.

[0043] Fig.18It is a schematic diagram of a partial structural cross-section of a double-sided weft knitting machine when the inner camera bracket is in the second position.

[0044] Figure numerals: 11, central blowing rod; 12, syringe mouth; 13, cloth support rack; 21, internal camera bracket; 22, first internal camera; 23, second internal camera; 3, cloth support rack frame; 31, vertical frame; 4, driving arm; 5, large plate; 61, external camera bracket; 62, first external camera; 63, second external camera; 7, fabric; 81, first invisible fabric surface; 82, second invisible fabric surface; 83, third invisible fabric surface; 84, fourth invisible fabric surface; 91, first vertical plane; 92, second vertical plane; 93, third vertical plane. DETAILED DESCRIPTION

[0045] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. The various drawings of the present invention are only for illustration to make it easier to understand the present invention, and the specific proportions can be adjusted according to design requirements. The upper and lower relationships of the relative elements and the definitions of the front / back in the figures described in the text should be understood by those skilled in the art to refer to the relative positions of the components, so they can all be flipped to present the same components, which should all fall within the scope disclosed in this specification.

[0046] refer to Figure 1 , Figure 2 , Figure 3 and Fig.14 The present application proposes an online defect detection device for double-sided weft knitted machine fabric, comprising a central blowing rod 11, an internal camera bracket 21, a first internal camera 22, a second internal camera 23, a cloth support frame 3, two driving arms 4, a large plate 5, an external camera bracket 61, a first external camera 62, a second external camera 63 and a fabric 7, wherein the internal camera bracket 21 is mounted on the central blowing rod 11 and is located on the inner side of the cloth support frame 3, and the cloth support frame 3 is located on the inner side of the fabric 7; the first internal camera 22 and the second internal camera 23 are symmetrically mounted on the internal camera bracket 21 with the central blowing rod 11 as the axis of symmetry, the field of view of the first internal camera 22 is a first area, the field of view of the second internal camera 23 is a second area, and the first area and the second area at least partially overlap. In the embodiment of the present application, reference is made to Figure 3 , the first area is indicated by red, the second area is indicated by yellow, and the overlapping part of the first area and the second area is indicated by brown; the external camera bracket 61 is fixedly mounted on the large plate 5 and is located outside the fabric 7 and the driving arm 4, and the driving arm 4 is located outside the fabric 7; refer to Figure 2 and Fig.14The first external camera 62 and the second external camera 63 are symmetrically mounted on the external camera bracket 61 with the central blowing rod 11 as the axis of symmetry. The field of view of the first external camera 62 is the third area, and the field of view of the second external camera 63 is the fourth area. The third area and the fourth area at least partially overlap. In the embodiment of the present application, the third area is represented by purple, the fourth area is represented by green, and the overlapping part of the third area and the fourth area is represented by blue; the cloth support frame 3 and the driving arm 4 are rotatably arranged with the central blowing rod 11 as the rotation axis. The online detection device for fabric defects of a double-sided weft knitting machine proposed in the present application is based on the existing equipment. By adding an internal camera bracket 21 and an external camera bracket 61 for mounting cameras on the central blowing rod 11 and the large plate 5 respectively, the online detection of fabric defects can be realized without changing the main structure of the double-sided weft knitting machine equipment, which is convenient for intelligent transformation of equipment, avoids increasing investment costs, and is conducive to the popularization of online detection technology for fabric defects. Furthermore, by arranging two cameras on the inner and outer sides of the fabric 7 respectively, the detection problem caused by being blocked by the fabric support frame 3 or the driving arm 4 can be overcome through the overlapping area of ​​the field of view of the two cameras.

[0047] In a specific embodiment, the inner camera bracket 21 is rotatably arranged with the central blowing rod 11 between a first position and a second position, Fig.17 , the internal camera bracket 21 is in the first position, the internal camera bracket 21 is vertically arranged with the external camera bracket 61, and the shooting direction of the first internal camera 22 and the second internal camera 23 is the first direction; Fig.18 , the internal camera bracket 21 is in the second position, the internal camera bracket 21 is vertically arranged with the external camera bracket 61, and the shooting direction of the first internal camera 22 and the second internal camera 23 is the second direction. In the embodiment of the present application, the rotation area of ​​the internal camera bracket 21 is composed of Fig.17 The first position shown is rotated clockwise to Fig.14 The position of the inner camera bracket 21 is shown, and then Fig.14 The position of the inner camera bracket 21 is rotated clockwise to Fig.18 The area passed by the second position is shown so that the area where the first area and the second area overlap does not intersect with the area where the third area and the fourth area overlap, as shown in FIG. Fig.17 and 18As shown, the area where the first area and the second area overlap includes the first invisible fabric surface 81, the second invisible fabric surface 82 and the brown area, and the area where the third area and the fourth area overlap includes the third invisible fabric surface 83, the fourth invisible fabric surface 84 and the blue area, and the two areas do not intersect. When acquiring the image of the fabric 7, it may be necessary to set a fill light, so that the area where the first area and the second area overlap does not intersect with the area where the third area and the fourth area overlap, thereby avoiding exposure of the image information acquired by the internal camera and the external camera, and avoiding affecting the image quality acquired by the internal camera and the external camera.

[0048] Specifically, refer to Figure 3 The distance between the center position of the first internal camera 22 or the second internal camera 23 and the center position of the central blowing rod 11 is adjustable between a first distance and a second distance, the first distance is smaller than the second distance, and the value of the first distance is:

[0049] ;

[0050] The horizontal plane where the center positions of the first internal camera 22 and the second internal camera 23 are located is the first horizontal plane, r represents the distance between the center position of the fabric 7 and the central blowing rod 11 in the first horizontal plane, and L represents half of the arc length of the overlapping portion of the first area and the second area in the first horizontal plane. represents the distance between the first side of the cross section of the vertical frame 31 of the cloth support frame 3 and the center position of the central blowing rod 11 in the first horizontal plane, represents half of the cross-sectional length of the vertical frame 31 of the cloth support frame 3 in the first horizontal plane, represents the first distance;

[0051] The value of the second distance is Difference from the camera width.

[0052] In a specific embodiment, the area where the third area overlaps with the fourth area is located on the inner side of the driving arm 4; the horizontal plane where the center positions of the first external camera 62 and the second external camera 63 are located is the second horizontal plane, and in the second horizontal plane, the distance between the external camera bracket 61 and the fabric 7 is greater than 2 times the distance between the second side of the cross-section of the driving arm 4 and the fabric 7; the external camera bracket 61 is installed on the large plate 5 with the central blowing rod 11 as the axis of symmetry, and on the external camera bracket 61, the middle part of the external camera bracket 61 is at the shortest distance from the fabric 7, that is, in the second horizontal plane, the central blowing rod 11 is located on the mid-vertical line of the external camera bracket 61.

[0053] Specifically, refer to Fig.11 , the distance between the center positions of the first external camera 62 and the second external camera 63 is adjustable between a third distance and a fourth distance, the third distance is smaller than the fourth distance, and the value of the third distance is:

[0054] ;

[0055] in, represents the distance between the second side of the cross section of the driving arm 4 and the fabric 7 in the second horizontal plane, represents half of the cross-sectional length of the driving arm 4 in the second horizontal plane, represents the distance between the internal and external camera support 61 and the fabric 7 in the second horizontal plane, Indicates the third distance;

[0056] The value of the fourth distance is:

[0057] ;

[0058] in, Indicates the fourth distance.

[0059] The present application proposes an online defect detection device for double-sided weft knitted machine fabrics, in which two internal cameras and two external cameras are respectively arranged on the inner and outer sides of the cylindrical fabric 7 just woven out from the needle cylinder mouth 12 to the cloth support frame 13. Specifically, the two internal cameras are arranged at a certain distance apart, and the fields of view of the two internal cameras at least partially overlap. When the field of view of one of the internal cameras is blocked by the cloth support frame 3, resulting in partial fabric 7 being missed, the missed fabric 7 area can be covered by the field of view of the other internal camera; similarly, the two external cameras are arranged at a certain distance apart, and the fields of view of the two external cameras at least partially overlap. When the field of view of one of the external cameras is blocked by the driving arm 4, resulting in partial fabric 7 being missed, the missed fabric 7 area can be covered by the field of view of the other external camera, thereby overcoming the detection problem caused by the field of view of the camera being blocked by the cloth support frame 3 or the driving arm 4.

[0060] The distance between the two internal cameras is between the first distance and the second distance, which can satisfy that the blocked part of the field of view of one internal camera can be covered by the field of view of the other internal camera; the distance between the two external cameras is between the third distance and the fourth distance, which can satisfy that the blocked part of the field of view of one external camera can be covered by the field of view of the other external camera. The online defect detection device for double-sided weft knitting machine fabric proposed in the present application provides a solution for realizing online detection of fabric defects by intelligently transforming the equipment without changing the main structure of the equipment, which is conducive to the popularization of online detection technology for fabric defects. When the distance between the two internal cameras is between the first distance and the second distance, and the distance between the two external cameras is between the third distance and the fourth distance, the specific situation of the field of view of each camera is specifically described through the following embodiments.

[0061] Embodiment 1

[0062] refer to Figure 3 , when the distance between the center position of the first internal camera 22 or the second internal camera 23 and the center position of the central blowing rod 11 is the first distance, the distance between the center position of the first internal camera 22 and the center position of the second internal camera 23 is .

[0063] refer to Figure 3 , the vertical plane where the center position of the central blowing rod 11 and the center position of the cross section of the vertical frame 31 of the cloth-supporting frame 3 are located is the first vertical plane 91, the vertical plane where the edge of the first area blocked by the cloth-supporting frame 3 away from the second internal camera 23 is located is the second vertical plane 92, and the intersection of the first vertical plane 91 and the second vertical plane 92 is the first intersection; the vertical plane where the edge of the second area close to the first internal camera 22 is located is the third vertical plane 93, and the intersection of the third vertical plane 93 and the fabric 7 is the second intersection. The cloth-supporting frame 3 rotates with the central blowing rod 11 as the rotation axis. When the cloth-supporting frame 3 rotates into the first area, the edge of the first area blocked by the cloth-supporting frame 3 will be tangent to the edge of the cloth-supporting frame 3. Therefore, when the cloth-supporting frame 3 rotates, the first intersection is always located on the surface of the fabric 7, and the position of the first internal camera 22 and the position of the second internal camera 23 are determined according to the intersection of the second vertical plane 92 and the internal camera bracket 21. When the cloth support frame 3 is rotated to make the first internal camera 22 and the second internal camera 23 meet the following conditions: when viewed from the first horizontal plane, the arc length of the fabric 7 intercepted by the first intersection line and the second intersection line is 1.5 times the cross-sectional length of the vertical frame 31 of the cloth support frame 3, the first distance is calculated according to the expression of the first distance. If there is no obstruction by the cloth support frame 3, the brown area should be fan-shaped. Figure 3 In the figure, the cross section of the first area blocked by the cloth-supporting frame 3 and the fabric 7 is the first invisible fabric surface 81, and the small fan-shaped area including the first invisible fabric surface 81 is still within the field of view of the second internal camera 23, so the small fan-shaped area is a yellow area.

[0064] refer to Figure 4 The cloth support frame 3 rotates with the central blowing rod 11 as the rotation axis, and rotates to Figure 4In the shown position, a portion of the cloth-supporting frame 3 is located in the area of ​​the first area excluding the overlapping area, and a portion is located in the overlapping area of ​​the first area and the second area. The cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the first area is the first invisible fabric surface 81, and the cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the second area is the second invisible fabric surface 82. There is no overlap between the first invisible fabric surface 81 and the second invisible fabric surface 82. Therefore, the first invisible fabric surface 81 is still within the field of view of the second internal camera 23, and the figure including the first invisible fabric surface 81 belongs to the yellow area. The second invisible fabric surface 82 is still within the field of view of the first internal camera 22, and the figure including the second invisible fabric surface 82 belongs to the red area.

[0065] refer to Figure 5 The cloth support frame 3 rotates with the central blowing rod 11 as the rotation axis, and rotates to Figure 5 In the shown position, the cloth-supporting frame 3 is entirely located in the overlapping area of ​​the first area and the second area, and the cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the first area is the first invisible fabric surface 81, and the cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the second area is the second invisible fabric surface 82. There is no overlap between the first invisible fabric surface 81 and the second invisible fabric surface 82, and therefore the first invisible fabric surface 81 is still within the field of view of the second internal camera 23, and the figure including the first invisible fabric surface 81 belongs to the yellow area, and the second invisible fabric surface 82 is still within the field of view of the first internal camera 22, and the figure including the second invisible fabric surface 82 belongs to the red area.

[0066] Since the first internal camera 22 and the second internal camera 23 are symmetrically mounted on the internal camera bracket 21 with the central blowing rod 11 as the symmetry axis, the first area and the second area are axisymmetric about the perpendicular midline of the internal camera bracket 21. Figures 3 to 5 When the cloth-supporting frame 3 rotates between the first area and the second area, the closer the center position of the cloth-supporting frame 3 is to the perpendicular midline of the inner camera bracket 21, the farther the distance between the first invisible fabric surface 81 and the second invisible fabric surface 82 is.

[0067] Embodiment 2

[0068] refer to Figure 6 and Figure 7The difference between this embodiment and the first embodiment is that the distance between the center position of the first internal camera 22 or the second internal camera 23 and the center position of the central blowing rod 11 is between the first distance and the second distance, the cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the first area is the first invisible fabric surface 81, and the cross-section of the area blocked by the cloth-supporting frame 3 and the fabric 7 in the second area is the second invisible fabric surface 82, and the first invisible fabric surface 81 and the second invisible fabric surface 82 do not overlap, so the first invisible fabric surface 81 is still within the field of view of the second internal camera 23, and the figure including the first invisible fabric surface 81 belongs to the yellow area, and the second invisible fabric surface 82 is still within the field of view of the first internal camera 22, and the figure including the second invisible fabric surface 82 belongs to the red area.

[0069] Embodiment 3

[0070] refer to Figures 8 to 10 The difference between this embodiment and the first embodiment is that the distance between the center position of the first internal camera 22 or the second internal camera 23 and the center position of the central blowing rod 11 is the second distance. The cloth support frame 3 rotates with the central blowing rod 11 as the rotation axis, and rotates to Figure 8 and 9 When the position is shown, the first area and the second area are not blocked; Fig.10 In the position shown, the cross-section of the area blocked by the cloth supporting frame 3 and the fabric 7 in the first area is the first invisible fabric surface 81, and it is not blocked in the second area. Therefore, the first invisible fabric surface 81 is still within the field of view of the second internal camera 23, and the figure including the first invisible fabric surface 81 belongs to the yellow area.

[0071] Embodiment 4

[0072] refer to Figures 11 to 13 , the distance between the center positions of the first external camera 62 and the second external camera 63 is equal to the third distance.

[0073] The driving arm 4 rotates with the central blowing rod 11 as the rotation axis, and rotates to Fig.11 In the position shown, the vertex of the area where the third area and the fourth area overlap is located on the second side of the cross section of the driving arm 4, and the driving arm 4 is located on the mid-vertical line of the external camera bracket 61. Since the first external camera 62 and the second external camera 63 are symmetrically mounted on the external camera bracket 61 with the central blowing rod 11 as the axis of symmetry, the third area and the fourth area are axisymmetric about the mid-vertical line of the external camera bracket 61. In the third area, the cross section of the area blocked by the driving arm 4 and the fabric 7 is the third invisible fabric surface 83, and in the fourth area, the cross section of the area blocked by the driving arm 4 and the fabric 7 is the fourth invisible fabric surface 84. There is no overlap between the third invisible fabric surface 83 and the fourth invisible fabric surface 84. The driving arm 4 rotates to the position as shown. Fig.12 and Fig.13 In the position shown, the third invisible fabric surface 83 and the fourth invisible fabric surface 84 do not overlap, so the third invisible fabric surface 83 is still within the field of view of the second external camera 63, and the figure including the third invisible fabric surface 83 belongs to the green area. The fourth invisible fabric surface 84 is still within the field of view of the first external camera 62, and the figure including the fourth invisible fabric surface 84 belongs to the purple area.

[0074] Embodiment 5

[0075] refer to Fig.14 and 15 The difference between this embodiment and the fourth embodiment is that the distance between the first external camera 62 and the second external camera 63 is between the third distance and the fourth distance. The driving arm 4 rotates with the central blowing rod 11 as the rotation axis, and rotates to Fig.11 In the position shown, the driving arm 4 is located on the mid-perpendicular line of the external camera bracket 61, and the vertex of the overlapping area of ​​the third area and the fourth area is located between the driving arm 4 and the fabric 7. Fig.14 and Fig.15 In the position shown, the third invisible fabric surface 83 and the fourth invisible fabric surface 84 do not overlap, so the third invisible fabric surface 83 is still within the field of view of the second external camera 63, and the figure including the third invisible fabric surface 83 belongs to the green area. The fourth invisible fabric surface 84 is still within the field of view of the first external camera 62, and the figure including the fourth invisible fabric surface 84 belongs to the purple area.

[0076] refer to Figures 11 to 13 , Figure 14 to Figure 15 When the driving arm 4 rotates between the third area and the fourth area, the closer the center position of the driving arm 4 is to the perpendicular bisector of the internal camera bracket 21, the closer the distance between the third invisible fabric surface 83 and the fourth invisible fabric surface 84 is.

[0077] Embodiment 6

[0078] refer to Fig.16 The difference between this embodiment and the fourth embodiment is that the distance between the first external camera 62 and the second external camera 63 is the fourth distance. The driving arm 4 rotates with the central blowing rod 11 as the rotation axis, and rotates to Fig.16 In the position shown, the driving arm 4 is located on the mid-vertical line of the external camera bracket 61, and the driving arm 4 is tangent to the third area and the fourth area respectively, without blocking the third area and the fourth area. The driving arm 4 continues to rotate and will only block any one of the third area and the fourth area. Therefore, the overlapping area of ​​the third area and the fourth area can meet the requirements of online detection, and there will be no missed detection due to the blocking of the driving arm 4.

[0079] refer to Fig.11 , Fig.14 and Fig.16 , the driving arm 4 is located on the mid-perpendicular line of the external camera bracket 61. When the shooting direction remains unchanged, the farther the distance between the center positions of the first external camera 62 and the second external camera 63 is, Fig.11 The distance between the third invisible fabric surface 83 and the fourth invisible fabric surface 84, Fig.14 The larger the distance between the third invisible fabric surface 83 and the fourth invisible fabric surface 84, the less likely it is to be blocked, until the distance between the first external camera 62 and the second external camera 63 is the fourth distance, the third area and the fourth area will not be blocked at the same time; and the smaller the overlapping area between the third area and the fourth area, the farther the vertex of the overlapping area is from the second side of the cross-section of the driving arm 4.

[0080] The above embodiments are only used to further illustrate the technical solutions of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solutions of the present invention.

Claims

1. An online defect detection device for double-sided weft knitted machine fabrics, characterized in that: It includes a central blowing rod, an inner camera bracket, a first inner camera, a second inner camera, a cloth-supporting frame, two driving arms, a large plate, an outer camera bracket, a first outer camera, a second outer camera and fabric, wherein the inner camera bracket is mounted on the central blowing rod and is located on the inner side of the cloth-supporting frame, and the cloth-supporting frame is located on the inner side of the fabric; the first inner camera and the second inner camera are symmetrically mounted on the inner camera bracket with the central blowing rod as a symmetry axis, the field of view of the first inner camera is a first area, the field of view of the second inner camera is a second area, and the first area and the second area at least partially overlap; the outer camera bracket is fixedly mounted on the large plate and is located on the outer side of the fabric and the driving arm, and the driving arm is located on the outer side of the fabric; the first outer camera and the second outer camera are symmetrically mounted on the outer camera bracket with the central blowing rod as a symmetry axis, the field of view of the first outer camera is a third area, the field of view of the second outer camera is a fourth area, and the third area and the fourth area at least partially overlap, and the cloth-supporting frame and the driving arm are rotatably arranged with the central blowing rod as a rotation axis.

2. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The distance between the center position of the first internal camera or the second internal camera and the center position of the central blowing rod is adjustable between a first distance and a second distance, the first distance is smaller than the second distance, and the value of the first distance is: ； The horizontal plane where the center positions of the first internal camera and the second internal camera are located is the first horizontal plane, r represents the distance between the fabric and the center position of the central blowing rod in the first horizontal plane, and L represents half of the arc length of the overlapping part of the first area and the second area in the first horizontal plane. It represents the distance between the first side of the cross section of the vertical frame of the cloth support frame and the center position of the central blowing rod in the first horizontal plane, It represents half of the cross-sectional length of the vertical frame of the cloth support frame in the first horizontal plane. represents the first distance; The value of the second distance is Difference from the camera width.

3. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The vertical plane where the center position of the central blowing rod and the center position of the vertical frame section of the cloth supporting frame are located is the first vertical plane, the vertical plane where the edge of the first area blocked by the cloth supporting frame and away from the second internal camera is located is the second vertical plane, and the intersection of the first vertical plane and the second vertical plane is the first intersection; the vertical plane where the edge of the second area close to the first internal camera is located is the third vertical plane, and the intersection of the third vertical plane and the fabric is the second intersection; when the distance between the center position of the first internal camera and the center position of the central blowing rod is equal to the first distance and the first intersection is located on the surface of the fabric, the arc length of the fabric intercepted by the first intersection and the second intersection is 1.5 times the length of the vertical frame section of the cloth supporting frame.

4. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The area where the third area overlaps with the fourth area is located inside the driving arm.

5. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The horizontal plane where the centers of the first external camera and the second external camera are located is a second horizontal plane. In the second horizontal plane, the distance between the external camera bracket and the fabric is greater than 2 times the distance between the second side of the driving arm cross section and the fabric.

6. The device for online defect detection of double-sided weft knitted machine fabric according to claim 5, characterized in that: The distance between the center positions of the first external camera and the second external camera is adjustable between a third distance and a fourth distance, the third distance is smaller than the fourth distance, and the value of the third distance is: ； in, represents the distance between the second side of the driving arm cross section and the fabric in the second horizontal plane, represents half of the cross-sectional length of the driving arm in the second horizontal plane, Indicates the distance between the internal and external camera bracket and the fabric in the second horizontal plane, Indicates the third distance; The value of the fourth distance is: ； in, Indicates the fourth distance.

7. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The external shooting bracket is installed on the large plate with the central blowing rod as the symmetry axis, and on the external shooting bracket, the distance between the middle part of the external shooting bracket and the fabric is the shortest.

8. The device for online defect detection of double-sided weft knitted machine fabric according to claim 1, characterized in that: The internal camera bracket is rotatably set between a first position and a second position with a central blowing rod. When the internal camera bracket is in the first position, the internal camera bracket is vertically set to the external camera bracket, and the shooting direction of the first internal camera and the second internal camera is a first direction; when the internal camera bracket is in the second position, the internal camera bracket is vertically set to the external camera bracket, and the shooting direction of the first internal camera and the second internal camera is a second direction.

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