A cloth detection device and method suitable for an open-width cloth winding machine

Abstract

A cloth detection device suitable for an open-width cloth winding machine, which rotates and operates on a large circular knitting machine, comprises: a frame, wherein a first rubber roller group and a second rubber roller group are arranged in parallel and at intervals on the frame, and cloth in a straightened state is transmitted between the first rubber roller group and the second rubber roller group; an image acquisition module, which is arranged between the first rubber roller group and the second rubber roller group, and comprises a first camera module, a second camera module, a driving mechanism, a shading member, and a backlight device, wherein the first camera module and the second camera module are reciprocated and slid along the cloth radial width direction at different positions in the cloth transmission direction by the driving mechanism, the shading member is arranged opposite to the first camera module at intervals of cloth, and the backlight device is arranged opposite to the second camera module at intervals of cloth, and the first camera module, the second camera module, the driving mechanism, and the backlight device are externally electrically connected to a control system.

Description

Technical Field

[0001] The present application relates to the field of textile machinery, and in particular to a cloth detection device and method suitable for an open-width cloth winding machine. Background Art

[0002] The open-width cloth winding machine is a cloth winding device used in large circular knitting machines. The internal space of existing large circular knitting machines is relatively limited. There are mainly two ways to detect the produced cloth. One way is to perform manual inspection during the production process, that is, arrange personnel to use the naked eye to check regularly. The other way is offline inspection, that is, when the cloth production is completed, an additional cloth inspection machine is used for inspection. The above two methods are not only time-consuming and labor-intensive, but also have deficiencies in the accuracy of the human eye and the real-time performance of the cloth inspection machine, which often leads to problems with poor batch quality.

[0003] To this end, the patent application with the publication number CN214572888U discloses a real-time cloth image acquisition and processing mechanism based on a circular knitting machine, in which a camera and a light source are set on the inner wall of the knitting table to improve the real-time performance of cloth detection. However, when the camera detects, the cloth is wound on the cloth drum, and most of the cloth in the image taken by the camera is in a curved state, which is not conducive to the comparison between the real-time image and the template. In addition, the position of the camera is relatively fixed, and it is difficult to detect defects in areas far from the camera, such as defects on the edge, which is prone to misjudgment. Therefore, the accuracy and comprehensiveness of the detection need to be further improved.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0005] The first object of the present application is to provide a cloth detection device suitable for an open-width cloth winding machine. The cloth detection device has a simple structure and can simultaneously perform image detection on the front side and the back side of the cloth while the cloth is being conveyed.

[0006] The second purpose of the present application is to provide a cloth detection method, which, in conjunction with a corresponding detection device, can effectively detect defects on the front and back of the cloth, with little or no missed detection.

[0007] To achieve the first purpose of the present application, the present invention discloses a cloth detection device suitable for an open-width cloth winding machine, which rotates and operates on a large circular knitting machine, comprising: a frame, wherein a first rubber roller group and a second rubber roller group are arranged in parallel and spaced relation, wherein the discharge end of the first rubber roller group corresponds to the feed end of the second rubber roller group, and there is a sufficient span between the first rubber roller group and the second rubber roller group and the cloth is straightened during the transmission process; an image acquisition module, which is arranged on the outside of the cloth straightened between the first rubber roller group and the second rubber roller group, and the image acquisition module comprises a first camera module and a second camera module arranged along the traveling direction of the cloth, a driving mechanism arranged on the frame, a shading member with a light absorbing function, and a backlight device; the first camera module and the second camera module are respectively reciprocated and slid along the radial width direction of the cloth by the driving mechanism; the The shading member is arranged opposite to the first camera module at intervals of cloth, and the shading member has a shading body matching the radial width of the cloth, and the height of the shading body basically matches the framing height H1 of the first camera module, so that the first camera module is configured to capture the front image of the cloth; the backlight device is arranged opposite to the second camera module at intervals of cloth, and the height of the backlight device basically matches the framing height H2 of the second camera module, and the backlight device is configured as a light source for fill light for the second camera module, so that the second camera module is configured to capture the back image of the cloth; the control system is at least used to receive real-time image information collected by the first camera module and the second camera module, and compare and analyze the real-time image information with its preset qualified template, and once the analysis result is unqualified, send a feedback instruction to the outside.

[0008] By adopting the above structure, while the cloth is continuously transported between the first rubber roller group and the second rubber roller group, the first camera module and the second camera module can simultaneously capture continuous and smooth images of the front side and back side of the cloth during the reciprocating sliding process, and can accurately cover the two edges in the width direction of the cloth for the detection of cloth defect points.

[0009] To achieve the second purpose of the present application, the present invention discloses a cloth detection method suitable for an open-width cloth winding machine, S1: within a predetermined operating time T1, based on a preset cloth winding roller operating speed V1, the cloth is conveyed from the first rubber roller group to the second rubber roller group for a length of L1, and a sliding cycle time T2 of the first camera module or the second camera module is set by a control system, wherein the sliding cycle time T2 is defined as the time of a single reciprocating stroke accumulated by the forward sliding stroke and the reverse sliding stroke of the first camera module or the second camera module from one end of the self-driving mechanism to the other end. When the first camera module is in a single reciprocating stroke, the shading member is located in an effective viewing area of ​​the first camera module, and each effective portion of the forward sliding stroke and the reverse sliding stroke captured by the first camera module is detected. The effective framing areas are superimposed on each other to form a first forward collective image area and a second forward collective image area, and the overlapping part of the first forward collective image area and the second forward collective image area is the first overlapping area; when the second camera module is in a single reciprocating stroke, the backlight device remains always on and is located in the effective framing area of ​​the second camera module, and the effective framing areas of the forward sliding stroke and the reverse sliding stroke captured by the second camera module are superimposed on each other to form a first reverse collective image area and a second reverse collective image area, and the overlapping part of the first reverse collective image area and the second reverse collective image area is the second overlapping area, at least ensuring that the first overlapping area and the second overlapping area can respectively basically fully cover the area where the cloth slides downward by a length of L1;

[0010] S2: transmitting the real-time cloth images captured by the first camera module and the second camera module to the control system;

[0011] S3: Based on the qualified template and threshold value preset in the control system, the real-time cloth image is analyzed and compared, the similarity between the real-time cloth image and the qualified template is calculated, and the similarity is compared with the threshold value;

[0012] If the similarity is greater than the threshold, the real-time cloth image analysis result is qualified and the cloth winding machine continues to operate;

[0013] If the similarity is less than the threshold, the real-time cloth image analysis result is unqualified and the cloth winding machine stops and alarms.

[0014] After adopting the above method, during the transmission of the cloth, the first camera module and the second camera module realize reciprocating sliding along the driving mechanism. During the reciprocating sliding, the first overlapping area captured by the first camera module can cover the front area of ​​the cloth conveying length L1, and the second overlapping area captured by the second camera module can cover the back area of ​​the cloth conveying length L1. The detection of the front and back sides of the cloth can be completed synchronously, automatically and comprehensively. When the detection is unqualified, the cloth rolling machine can automatically alarm, which effectively reduces the labor intensity of the workers and ensures the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] A detailed description given as non-limiting examples better explains what the application consists of and how it can be implemented, and furthermore, this description refers to the accompanying drawings, in which:

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a cloth detection device provided in an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of the side structure of a cloth detection device provided in an embodiment of the present invention, in which the side plate of the frame is omitted;

[0018] Figure 3 for Figure 2 The side view structural diagram of the image acquisition module is highlighted in the middle;

[0019] Figure 4 A schematic diagram of the coordination structure of the image acquisition module, the light shielding member, and the auxiliary light source device provided in an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the matching structure of a shading member and an auxiliary light source device provided in an embodiment of the present invention;

[0021] Figure 6 for Figure 5 Detailed view of the side panel portion of the middle shade;

[0022] Figure 7 A schematic diagram of a light shielding member corresponding to a first position and a second position provided by an embodiment of the present invention;

[0023] Figure 8A-8C It is a principle diagram of the first overlapping area or the second overlapping area provided by the present invention substantially fully covering the area where the cloth slides downward by a length of L1;

[0024] Figure 9a-9c This is a schematic diagram of the first camera or the second camera provided by the present invention, which basically does not miss any inspection during a single sliding stroke;

[0025] Fig.10 It is a framing image of the first camera module and the second camera module in a single reciprocating stroke provided by an embodiment of the present invention. In this figure, the framing height H1 of the first camera module is equal to the framing height H2 of the second camera module;

[0026] Fig.11A It is a framing image of the first camera module and the second camera module in a single reciprocating stroke provided by an embodiment of the present invention. In this figure, the framing height H1 of the first camera module is greater than the framing height H2 of the second camera module, and the slip cycle time T2 is the ratio of the framing height H2 of the second camera module to the running speed V1 of the cloth winding roller;

[0027] Fig. 11B It is the framing image of the first camera module and the second camera module in a single reciprocating stroke provided by an embodiment of the present invention. In this figure, the framing height H1 of the first camera module is equal to the framing height H2 of the second camera module, and the slip cycle time T2 is the ratio of the framing height H1 of the first camera module to the running speed V1 of the cloth winding roller.

[0028] Description of labels:

[0029] 1. Frame; 11. Rotating shaft; 12. Fastener; 13. First stopper; 14. Second stopper; 2. First rubber roller group; 3. Second rubber roller group; 4. Cloth roller; 5. Image acquisition module; 51. Driving mechanism; 511. Guide rail; 512. Slider; 513. Driving member; 52. First camera module; 521. First lens; 522. Light guide cover; 53. Second camera module; 531. Second lens; 54. Shading member; 541. Shading body; 55. Backlight device; 551. Device body; 552. Groove; 553. Second light source; 56. Mounting seat; 561. Mounting plate; 562. Side plate; 563. Opening groove; S1. First overlapping area; S2. Second overlapping area. DETAILED DESCRIPTION

[0030] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the present application.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be used interchangeably.

[0033] The wording is to be construed as restrictive.

[0034] Please refer to Figure 1-2, a cloth detection device suitable for an open-width cloth rolling machine provided in this embodiment is now described. The cloth rolling machine is a cloth rolling device that rotates and operates on a large circular knitting machine, so the cloth detection device rotates synchronously with the cloth rolling machine and performs cloth detection. The cloth detection device includes: a frame 1, an image acquisition module 5 arranged on the outside of the cloth straightened between the first rubber roller group 2 and the second rubber roller group 3, and a control system; the working principle of the cloth detection device is to leave enough span and straighten the cloth through the first rubber roller group 2 and the second rubber roller group 3 arranged in parallel and spaced intervals on the frame 1, and a collection module for collecting the front and back images of the cloth is arranged on the outside of the cloth straightened between the first rubber roller group 2 and the second rubber roller group 3, and the control system realizes communication with the image acquisition module 5, and recognizes and processes the image collected by the image acquisition module.

[0035] Specifically, Figure 2-3 As shown, the frame 1 is provided with a first rubber roller group 2 and a second rubber roller group 3 in parallel and at intervals. Here, the parallel interval means that the axial directions of the first rubber roller group 2 and the second rubber roller group 3 are substantially parallel and separated by a predetermined length along a predetermined direction, as shown in FIG. Figure 3 As shown, the first rubber roller group 2 and the second rubber roller group 3 are basically parallel in the axial direction, and there is a spacing in the X direction and the Y direction respectively. A cloth winding roller 4 is provided on one side of the second rubber roller group 3. The discharge end of the first rubber roller group 2 corresponds to the feed end of the second rubber roller group 3. There is a sufficient span between the first rubber roller group 2 and the second rubber roller group 3 and it is used to straighten the cloth during the transmission process. It should be noted that in the prior art, based on the fact that the above two rubber roller groups only play the role of traction and guidance, the span between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3 is generally short. In this case, due to the addition of the image acquisition module 5, it is necessary to ensure that the cloth is transmitted from the discharge end of the first rubber roller group 2 to the feed end of the second rubber roller group 3 at a certain rate. During this sufficiently long time, the image acquisition module 5 can capture the image of the cloth in a flat state. At the same time, since the image acquisition module 5 also occupies a certain space, the span between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3 needs to be appropriately enlarged to facilitate the operator to wind the cloth from the first rubber roller group 2 to the second rubber roller group 3 for cloth winding operation; the discharge end of the second rubber roller group 3 corresponds to the feed end of the cloth winding roller 4, that is, the cloth winding path of the cloth, which is first pulled by the first rubber roller group 2, then pulled by the second rubber roller group 3, and finally wound on the cloth winding roller 4. The cloth winding roller 4 is arranged at the power output end of the cloth winding motor, and the cloth tensioning is achieved through the winding traction of the cloth winding motor.

[0036] like Figure 2-3As shown, the image acquisition module 5 includes a first camera module 52 and a second camera module 53 arranged along the traveling direction of the cloth, a driving mechanism 51 arranged on the frame 1, a shading member 54 with a light absorbing function, and a backlight device 55; wherein, the first camera module 52 can be arranged upstream or downstream of the second camera module 53 along the traveling direction of the cloth. In the present embodiment, the first camera module 52 is arranged upstream of the second camera module 53 along the traveling direction of the cloth, and the first camera module 52 and the second camera module 53 are respectively reciprocated along the radial width direction of the cloth by the driving mechanism 51. In the present embodiment, during the reciprocating sliding process of the first camera module 52 and the second camera module 53, the actual cloth area mapped by the image area where the cloth exists captured in the corresponding lens is the effective framing area, while the actual area mapped by the image area where the cloth is out of the edge and belongs to the frame 1 does not belong to the effective framing area. In addition, the framing height H1, H2 refers to the maximum height of the cloth in a single image that can be captured by the first camera module 52 or the second camera module 53, mapped to the corresponding height of the cloth in the actual scene; the framing width W1, W2 refers to the maximum width of the cloth in a single image that can be captured by the first camera module 52 or the second camera module 53, mapped to the corresponding width of the cloth in the actual scene.

[0037] like Figure 3-Figure 4 As shown, in the present embodiment, the first camera module 52 and the second camera module 53 are linked. In some embodiments, the first camera module 52 and the second camera module 53 may also be driven by different power sources. The driving mechanism 51 includes a driving member 513, a driven member connected to the driving member 513, a slider 512 arranged on the driven member, and a fixed seat installed on the slider 512, wherein the driving member 513 is a motor with forward and reverse functions, such as a servo motor or a stepping motor, and the driven member is a belt, chain or screw driven by the motor, and the belt, chain or screw is connected to the motor in a prior art and is not described in detail here. The slider 512 is arranged on the belt, chain or screw, and the first camera module 52 and the second camera module 53 are arranged along the height direction of the mounting seat 56 and are installed on the slider 512 through the fixed seat. The driving member 513 drives the driven member to make the slider 512 slide forward or reversely along the width direction of the cloth. Please refer to Figure 4, with the first camera module 52 and the second camera module 53 being located at the rightmost end of the guide rail 511 as the starting point, the positive sliding means that the first camera module 52 and the second camera module 53 slide from the rightmost end of the guide rail 511 to the leftmost end of the guide rail 511, and the reverse sliding means that the first camera module 52 and the second camera module 53 slide from the leftmost end of the guide rail 511 to the rightmost end of the guide rail 511. It should be noted that the positive and reverse directions are only used to distinguish the two travel sections of the first camera module 52 and the second camera module 53 sliding back and forth on the guide rail 511. When the starting reference points are different, the positive and reverse directions are It is also different, but not limited to this, so that the framing area of ​​the first lens 521 in the first camera module 52 and the framing area of ​​the second lens 531 in the second camera module 53 can both cover the area in the direction of the cloth width. In this way, on the one hand, the range captured by the first camera module 52 and the second camera module 53 can accurately cover the two edges in the front direction of the cloth width and the reverse direction of the cloth width, making the detection more comprehensive. On the other hand, the images captured by the first camera module 52 and the second camera module 53 can further highlight the local details of the cloth, making the detection more accurate.

[0038] like Figure 3 Or as shown in Figure 4, the shading member 54 is arranged opposite to the first camera module 52 with cloth intervals, and the shading member 54 has a shading body 541 that matches the cloth width, and the height of the shading body 541 basically matches the framing height H1 of the first camera module 52. Matching means that the length or height of the shading body 541 can cover the effective framing area of ​​the first camera module 52, and basic matching means that the coverage rate reaches more than 90%, so that the first camera module 52 is configured to capture the front image of the cloth. It can be understood that cloth is a material used to make clothes. Clothes have an outer surface and an inner surface that contacts the human body. The outer surface of the clothes directly affects the viewer's perception, so the outer surface has higher aesthetic requirements than the inner surface, that is, the control of defects is also more stringent. The front of the cloth mentioned in this embodiment refers to the side of the cloth used as the outer surface of the clothes. In addition, it should be noted that the cloth is formed by interlacing fabrics, and there are many tiny pores between the fabrics, which are not completely closed and opaque, so the real background on the back of the cloth will interfere with the front image of the cloth collected by the first camera module 52. In order to eliminate the interference, the shading member 54 is added, and the shading member 54 can be made of a light-absorbing material such as a black plastic board, or has a light-absorbing coating such as a black coating. By setting the shading member 54, the background noise can be effectively reduced, the image contrast can be improved, and the camera can collect the image of the front of the cloth more accurately.

[0039] like Figure 3As shown in FIG. 4, the backlight device 55 is arranged opposite to the second camera module 53 with a gap between the pieces of cloth, and the height of the backlight device 55 basically matches the framing height H2 of the second camera module 53. Here, the matching means that the light emitted by the backlight device 55 can cover the effective framing area of ​​the second camera module 53, and the basic matching means that the coverage rate is more than 90%. The backlight device 55 is configured as a light source for the second camera module 53 to perform fill light, so that the second camera module 53 is configured to capture the image of the back side of the cloth. It should be noted that no other fill light source is set at the second lens 531 of the second camera module 53, because if other fill light sources are set at the second lens 531 of the second camera module 53, the front side of the cloth will be illuminated and the back side of the protruding cloth cannot be compared, and the second camera module 53 captures the image of the back side of the cloth through the front side of the cloth.

[0040] The control system is at least used to receive the real-time image information collected by the first camera module 52 and the second camera module 53, and compare and analyze the real-time image information with the preset qualified template. If the analysis result is unqualified, a feedback instruction is sent out. The forms of cloth defects that result in unqualified results include: broken needles, oily yarn, oil stains, holes, horizontal stripes, etc. Specifically, broken needles refer to cracks along the warp lines on the cloth surface, usually with a hole formed at the end. Oil stains refer to black oil spots caused by oil on the machine or dust floating in the air contaminating the cloth surface. Oily yarn refers to long weft defects formed on the cloth surface due to the original yarn carrying oil or dirt. Holes refer to broken yarns and holes on the cloth surface. Horizontal strips refer to some abnormal continuous horizontal cycles in the cylindrical knitted fabric. The object of sending feedback instructions outward here is the electrical device that needs to respond when the detection is unqualified, such as the drive component 513, the alarm, the cloth winding motor, etc. The feedback instructions include but are not limited to the start and stop signals of the electrical device such as the alarm start signal and the winder motor stop signal.

[0041] Furthermore, the first lens 521 of the first camera module 52 and the second lens 531 of the second camera module 53 are respectively vertically arranged on the side close to the front side of the cloth. The advantage of arranging the first lens 521 and the second lens 531 vertically to the cloth is that the image of the cloth will not be tilted when entering the first lens 521 and the second lens 531. The images taken by the first camera module 52 and the second camera module 53 can better restore the actual image, which is conducive to discovering defects on the cloth.

[0042] Compared with the prior art, the cloth detection device provided in the present embodiment has a sufficient span set by the first rubber roller group 2 and the second rubber roller group 3, and a first camera module 52 and a second camera module 53 respectively configured to obtain the front image and the back image of the cloth, so that while the cloth is continuously conveyed, the first camera module 52 and the second camera module 53 can simultaneously capture continuous and smooth front and back images of the cloth in the process of reciprocating sliding, and can accurately cover the two edges in the width direction of the cloth for the detection of cloth defect points.

[0043] Reference again Figure 2-3 , the connecting line between the section at the discharge end of the first rubber roller group 2 and the section at the feed end of the second rubber roller group 3 constructs a transmission section, and the image acquisition module 5 is located between the transmission section and the cloth rolling roller 4. It should be noted that the front of the cloth transported by the existing open-width cloth rolling machine is facing the cloth rolling roller 4, so the image acquisition module 5 is set on the inside, which is also based on the consideration of the front detection of the cloth. In addition, the distance between the feed end of the first rubber roller group 2 and the axis of the cloth rolling roller 4 in the X direction will be smaller than the distance between the discharge end of the second rubber roller group 3 and the axis of the cloth rolling roller 4 in the X direction. In this way, while meeting the detection of the front and back of the cloth, the structure of the cloth detection device can be made more compact.

[0044] like Figure 3As shown, in the present embodiment, the first camera module 52 is provided with a plurality of first light sources at the outer diameter end of the first lens 521, and the plurality of first light sources can be symmetrically arranged around the axis of the first lens 521. The number of the first light sources can be at least three, such as 9-12, and a light guide cover 522 is further provided at the outer periphery of the first light source, and the light guide cover 522 covers the front end of the lens to prevent stray light from other positions from affecting the first lens 521. The light guide cover 522 also has a side wall, and the side wall is used to project the light paths of the plurality of first light sources to the front of the first lens 521 of the first camera module 52, that is, the light path of the first light source covers the path area between the first lens 521 and the cloth, and a pure light path is added to the first lens 521, so that the first lens 521 can obtain a clearer cloth image. The second camera module 53 is additionally provided with a shading cover 532 at one end of the second lens 531. The backlight device 55 includes a device body 551. A groove 552 is formed on the device body 551. The groove 552 has a plurality of second light sources 553 arranged along the radial width direction of the cloth. The shading cover 532 and the light guide cover 522 are fixedly connected to each other and are configured to isolate the light interference of the first light source and guide the light of the second light source 553 to enter the second lens 531 of the second camera module 53. By providing the light guide cover 522 and the shading cover 532, not only the guidance of the light of the first light source and the light of the second light source 553 is achieved respectively, but also the interference of the light of the first light source to the second camera module 53 is avoided. The frame 1 is provided with a mounting base 56 for fixing the shading member 54 and the backlight device 55. The light absorbing surface of the shading body 541 exceeds the light emitting surface of the backlight device 55, preferably exceeds by 5-10 cm, so that the light absorbing surface is closer to the cloth located between the first rubber roller group 2 and the second rubber roller group 3 than the light emitting surface, that is, the front and rear position relationship between the light absorbing surface and the light emitting surface is defined. Since the light emitting surface is further back than the light absorbing surface, the light of the second light source 553 projected into the effective viewing area of ​​the first camera module 52 is reduced, thereby avoiding the interference of the light of the second light source 553 on the first camera module 52. On the basis of setting up the light guide cover 522 and the light shield 532, the first lens 521 of the first camera module 52 can obtain a clearer front image of the cloth, and at the same time, the second lens 531 of the second camera module 53 can obtain a clearer back image of the cloth.

[0045] When the cloth is not properly inspected, it needs to be processed manually. To facilitate the operation of the staff, Figure 3As shown in or 7, the mounting seat 56 is configured to be able to generate an active connection with the frame 1 for position adjustment, at least when the mounting seat 56 is in the first position, the shading body 541 is in the effective framing area corresponding to the first lens 521 of the first camera module 52, and the plurality of the second light sources 553 are in the effective framing area corresponding to the second lens 531 of the second camera module 53; when the mounting seat 56 is in the second position, the shading body 541 is moved away from the effective framing area corresponding to the first lens 521 of the first camera module 52, and the plurality of the second light sources 553 are moved away from the effective framing area corresponding to the second lens 531 of the second camera module 53, so as to facilitate the workers to carry out the cloth loading operation from the first rubber roller group 2 to the second rubber roller group 3. The first position refers to the working positions of the shading member 54 and the backlight device 55 on the mounting seat 56 when the image acquisition module 5 is operating normally. At this time, the shading body 541 is in the effective framing area corresponding to the first lens 521 of the first camera module 52 and is basically parallel to the width direction of the cloth. The second position refers to the placement position of the mounting seat 56 during the manual cloth loading process when the image acquisition module 5 stops operating. At this time, at least it is ensured that the shading member 54 is not in the effective framing area corresponding to the first lens 521 of the first camera module 52, and the backlight device 55 is not in the effective framing area corresponding to the second lens 531 of the second camera module 53, so as to facilitate operation.

[0046] like Figure 4-Figure 7 As shown, the mounting seat 56 includes a mounting plate 561 and two side plates 562 for fixing the shading member 54 or the backlight device 55. The mounting plate 561 is arranged between the two side plates 562. One end of the side plate 562 is rotatably pivoted to the frame 1 via a rotating shaft 11 arranged on the frame 1. A communicating open groove 563 is provided at the adjacent position of the mounting plate 561 and the side plate 562. The opening portion on the mounting plate 561 is larger than the opening portion on the side plate 562. A fastener 12 is provided on the frame 1. The fastener 12 penetrates the open groove 563 and presses the side plate 562 against the frame 1, so that the mounting seat 56 is fixed in the first position. The fastener 12 is a locking screw threadedly connected to the frame 1, and the opening groove 563 is used to make way for the fastener 12 during the rotation of the mounting seat 56 around the rotating shaft 11. The opening portion on the light shielding body 541 is used to make way for the head of the locking screw, and the opening portion on the side plate 562 is used to make way for the rod of the locking screw. Therefore, the opening portion on the light shielding body 541 is larger than the opening portion on the side plate 562. In addition, through the setting of the opening groove 563, when the mounting seat 56 is rotating, there is no need to remove the fastener 12, and only the fastener 12 needs to be loosened, making the operation simple and convenient. Please refer to Figure 6-7As shown, the frame 1 is also provided with a first stopper 13 and a second stopper 14, respectively. The first stopper 13 and the second stopper 14 are respectively abutted against the two sides of the side plate 562 to limit the position, so that the mounting seat 56 is switched between the first position and the second position with the rotating shaft 11 as the rotation axis 11. The first stopper 13 and the second stopper 14 are a first stopper screw and a second stopper screw fixed to the frame 1, the rod of the stopper screw is threadedly connected to the frame 1, and the head of the stopper screw is configured to abut against the side plate 562. When the mounting base 56 is to be rotated from the first position to the second position, it is only necessary to loosen the fastener 12, rotate the mounting base 56, and make the mounting base 56 rotate around the rotating shaft 11, and at the same time, the locking screw is rotated out of the open groove 563 until the side edge of the side plate 562 abuts against the head of the second limiting screw, and the mounting base 56 is limited in the second position without any other additional operation; when the mounting base 56 is to be rotated from the second position to the first position, it is only necessary to rotate the mounting base 56, and make the mounting base 56 rotate around the rotating shaft 11, and at the same time, the locking screw is rotated into the open groove 563, and then the locking screw is tightened to achieve the fastening of the mounting base 56.

[0047] The present embodiment also provides a cloth detection method applicable to an open-width cloth winding machine, which is applicable to the above-mentioned cloth detection device, S1: within a predetermined running time T1, based on a preset running speed V1 of the cloth winding roller 4, the cloth is conveyed from the first rubber roller group 2 to the second rubber roller group 3 for a length of L1, and a sliding cycle time T2 of the first camera module 52 or the second camera module 53 is set by a control system, and the sliding cycle time T2 is defined as the time of a single reciprocating stroke accumulated by the positive sliding stroke and the reverse sliding stroke of the first camera module 52 or the second camera module 53 from one end of the self-driving mechanism 51 to the other end. When the first camera module 52 is in a single reciprocating stroke, the shading member 54 is located in an effective viewing area of ​​the first camera module 52, and the positive sliding stroke and the reverse sliding stroke captured by the first camera module 52 are captured. Each effective framing area is superimposed on each other to form a first forward collective image area and a second forward collective image area, and the overlapping part of the first forward collective image area and the second forward collective image area is a first overlapping area S1; when the second camera module 53 is in a single reciprocating stroke, the backlight device 55 remains always on and is located in the effective framing area of ​​the second camera module 53, and each effective framing area of ​​the forward sliding stroke and the reverse sliding stroke captured by the second camera module 53 is superimposed on each other to form a first reverse collective image area and a second reverse collective image area, and the overlapping part of the first reverse collective image area and the second reverse collective image area is a second overlapping area S2, at least ensuring that the first overlapping area S1 and the second overlapping area S2 can respectively basically fully cover the area where the cloth slides downward by a length of L1;

[0048] S2: transmitting the real-time cloth images collected by the first camera module 52 and the second camera module 53 to the control system;

[0049] S3: Based on the qualified template and threshold value preset in the control system, the real-time cloth image is analyzed and compared, the similarity between the real-time cloth image and the qualified template is calculated, and the similarity is compared with the threshold value;

[0050] If the similarity is greater than the threshold, the real-time cloth image analysis result is qualified and the cloth winding machine continues to operate;

[0051] If the similarity is less than the threshold, the real-time cloth image analysis result is unqualified and the cloth winding machine stops and alarms.

[0052] The following mainly describes the S1 step in detail:

[0053] First, the analysis model is established. In the actual application scenario, the first camera module 52 and the second camera module 53 slide horizontally along the follower while the cloth is transported downward. It is not easy to analyze the situation when the first camera module 52, the second camera module 53 and the cloth are all moving. Therefore, the analysis model assumes that the cloth is stationary. It can be understood that the movement of the first camera module 52 and the second camera module 53 includes horizontal sliding and movement in the opposite direction of the cloth transmission direction. In general, the sliding rates of the first camera module 52 and the second camera module 53 are equal and fixed.

[0054] Secondly, the working process and principle of the method are analyzed. It is assumed that the first camera module 52 and the second camera module 53 are of the same model. The first camera module 52 and the second camera module 53 are described with the framing width W1, W2 and the framing height H1, H2 having the same values. Then, based on the sliding periodic stroke WS of the first camera module 52 and the second camera module 53, the periodic stroke WS is defined as a single reciprocating stroke accumulated by the positive sliding stroke and the reverse sliding stroke of the first camera module 52 and the second camera module 53 from one end of the driving mechanism 51 to the other end. As long as the effective viewing areas of the first camera module 52 and the second camera module 53 at both ends of the driving mechanism 51 can cover the two edges in the cloth width direction, the periodic stroke WS is a floating range. In this embodiment, the stroke value of the periodic stroke WS is twice the value of the cloth width WB. For example, the first camera module 52 and the second camera module 53 are located at the rightmost end of the driving mechanism 51 as the starting point for a single reciprocating stroke. The first camera module 52 and the second camera module 53 slide from the rightmost end of the driving mechanism 51 to the leftmost end as a positive slide, and vice versa as a reverse slide. Fig. 8AAs shown, the middle rectangle represents the cloth, and the upper and lower ends of the cloth are the first rubber roller group 2 and the second rubber roller group 3 respectively. There are two inclined paths in the center of the cloth, wherein the upper one is the effective framing area of ​​the first camera module 52, and the lower one is the effective framing area of ​​the second camera module 53. When the first camera module 52 is in a single reciprocating stroke, the shading member 54 is located in the effective framing area of ​​the first camera module 52, and the effective framing areas of the forward sliding stroke and the reverse sliding stroke collected by the first camera module 52 are superimposed on each other to form a first forward collective image area and a second forward collective image area, respectively. The first forward collective image area and the second forward collective image area overlap as the first overlapping area S1; when the second camera module 53 is in a single reciprocating stroke, the backlight device 55 remains on and is located in the effective framing area of ​​the second camera module 53, and the effective framing areas of the forward sliding stroke and the reverse sliding stroke collected by the second camera module 53 are superimposed on each other to form the first reverse collective image area and the second reverse collective image area, respectively, and the first reverse collective image area and the second reverse collective image area overlap as the second overlapping area S2. Figure 8C As shown, in this figure, only the second overlapping area S2 of the second camera module 53 is compared with the area where the cloth slides downward by a length of L1. The first overlapping area S1 of the first camera module 52 is compared similarly, at least ensuring that the first overlapping area S1 and the second overlapping area S2 can respectively and basically fully cover the area where the cloth slides downward by a length of L1.

[0055] like Figure 9a-9c As shown, in this figure, only the second camera module 53 is used as an example to illustrate how to achieve basically no missed detection. The first camera module 52 is similar. According to the running speed V1 of the cloth rolling roller 4, the slip cycle time T2, and the above analysis model, it can be concluded that the first positive collection image area and the first reverse collection area of ​​the second camera module 53 in one cycle have three superposition results:

[0056] Specifically, the length L3 of the second overlapping area S2 is defined as the length of the perpendicular line between the rightmost end point and the leftmost line segment of the second overlapping area S2; in a sliding cycle time T2, Figure 9a The conveying length L2 of the middle cloth is greater than the framing height H2, and the length L3 of the second overlapping area S2 is less than the width WB of the cloth. At this time, there is a gap area between the second reverse collective image area at the upper right end and the first reverse collective image area at the lower right end, that is, there is a missed detection area; Figure 9b The conveying length L2 of the middle cloth is equal to the framing height H2, and the length L3 of the second overlapping area S2 is equal to the width WB of the cloth. However, the rightmost end of the second overlapping area S2 has only one endpoint, and at this time, there is just no gap between the second reverse collective image area at the upper rightmost end and the first reverse collective image area at the lower rightmost end. Fig.9cThe conveying length L2 of the middle cloth is less than the framing height H2, the length L3 of the second overlapping area S2 is equal to the width WB of the cloth, and there are two endpoints at the rightmost end of the second overlapping area S2. At this time, there is no gap between the second reverse collective image area at the upper rightmost end and the first reverse collective image area at the lower rightmost end, and the area of ​​the second overlapping area S2 is greater than Figure 9b That is, at least ensure that the length L3 of the second overlapping area S2 can cover the width WB of the cloth, and basically no missed inspection will occur.

[0057] According to the above three results, when the framing height H1 of the first camera module 52 is equal to the framing height H2 of the second camera module 53, if missed detection is to be avoided, the conveying length L2 of the cloth should be equal to or less than the framing heights H1, H2 during the slip cycle time T2. Similarly, when the cloth conveying length value is H2, the first camera module 52 and the second camera module 53 should complete at least one slip cycle time T2; that is, based on the preset running speed V1 of the cloth winding roller 4, since the running speed V1 of the cloth winding roller 4 is to adapt to the weaving speed of the circular knitting machine, the running speed V1 of the cloth winding roller 4 is predetermined, based on the framing heights H1 and H2 of the first camera module 52 and the second camera module 53, the time T3=H1 / V1 or H2 / V1 for the cloth to pass through the framing heights H1 and H2 is obtained, wherein the time T3 for the cloth to pass through the framing heights H1 and H2 refers to the time taken when the cloth moves downward and the conveying length value is the framing heights H1 and H2, the slip cycle time T2≤T3, and the average slip rate V2=WS / T2 of the first camera module 52 and the second camera module 53.

[0058] Based on the above analysis principle, when the framing height H1 of the first camera module 52 is different from the framing height H2 of the second camera module 53, the framing height H1 of the first camera module 52 is greater than the framing height H2 of the second camera module 53, and the framing height H1 of the first camera module 52 is less than the framing height H2 of the second camera module 53. Fig.11A As shown, when the sliding cycle time T2=H2 / V1, there is no gap between the first reverse collective image area and the second reverse collective image area of ​​the second camera module 53, and there is no gap between the first forward collective image area and the second forward collective image area of ​​the first camera module 52. Under this condition, no missed detection will occur in the first camera module 52 and the second camera module 53; Fig. 11BAs shown, when the slip cycle time T2=H1 / V1, there is no gap between the first positive collective image area and the second positive collective image area of ​​the first camera module 52, but at the same time there is a gap between the first reverse collective image area and the second reverse collective image area of ​​the second camera module 53, that is, if a higher framing height is used as the critical value of the slip cycle time T2, the camera module with a smaller framing height will miss the detection. In summary, the slip cycle time T2 of the first camera module 52 or the second camera module 53 is controlled by the control system, further including: based on the preset running speed V1 of the cloth rolling roller 4, the framing height H1 of the first camera module 52 and the framing height H2 of the second camera module 53, the time T3=MIN(H1, H2) / V1 for the cloth to pass through the minimum framing height MIN(H1, H2) is obtained, and the slip cycle time T2≤T3.

[0059] After adopting the above method, during the transmission of the cloth, the first camera module 52 and the second camera module 53 realize reciprocating sliding along the driving mechanism 51. During the reciprocating sliding process, the first overlapping area S1 captured by the first camera module 52 can cover the front area of ​​the cloth conveying length L1, and the second overlapping area S2 captured by the second camera module 53 can cover the back area of ​​the cloth conveying length L1. The detection of the front and back sides of the cloth can be completed synchronously, automatically and comprehensively. When the detection is unqualified, the cloth winding machine can automatically alarm, which effectively reduces the labor intensity of the workers and ensures the quality of the product.

[0060] It should be understood that all the above preferred embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present application should be within the legal protection scope of the present application.

Claims

1. A cloth detection device suitable for an open-width cloth winding machine, rotating on a circular knitting machine, characterized in that: include: A frame (1), wherein the frame (1) is provided with a first rubber roller group (2) and a second rubber roller group (3) in parallel and at intervals, a cloth rolling roller (4) is provided on one side of the second rubber roller group (3), the discharge end of the first rubber roller group (2) corresponds to the feed end of the second rubber roller group (3), the discharge end of the second rubber roller group (3) corresponds to the feed end of the cloth rolling roller (4), and there is a sufficient span between the first rubber roller group (2) and the second rubber roller group (3) and the cloth is used to be straightened during the transmission process; An image acquisition module (5) is arranged on the outer side of the cloth being straightened between the first rubber roller group (2) and the second rubber roller group (3), the image acquisition module (5) comprising a first camera module (52) and a second camera module (53) arranged along the direction of travel of the cloth, a driving mechanism (51) arranged on the frame (1), a shading member (54), and a backlight device (55); the first camera module (52) and the second camera module (53) are respectively slid back and forth along the radial width direction of the cloth by the driving mechanism (51); the shading member (54) is arranged opposite to the first camera module (52) at intervals of the cloth, the shading member (54) has a shading body (541) matching the radial width of the cloth, and the height of the shading body (541) is substantially the same as that of the first camera module The backlight device (55) is arranged opposite to the second camera module (53) with the cloth spaced therebetween, and the height of the backlight device (55) is substantially matched with the framing height H2 of the second camera module (53). The backlight device (55) is configured as a light source for the second camera module (53) to perform fill light, so that the second camera module (53) is configured to capture an image of the back side of the cloth. A control system is at least used for receiving real-time image information captured by the first camera module (52) and the second camera module (53), and comparing and analyzing the real-time image information with a preset qualified template, and sending a feedback instruction to the outside if the analysis result is unqualified.

2. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 1, characterized in that: The first lens (521) of the first camera module (52) and the second lens (531) of the second camera module (53) are respectively arranged in a direction perpendicular to the front side of the transmitted cloth.

3. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 1 or 2, characterized in that: The connecting line between the section at the discharge end of the first rubber roller group (2) and the section at the feed end of the second rubber roller group (3) forms a transmission section, and the image acquisition module (5) is located between the transmission section and the cloth rolling roller (4).

4. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 1, characterized in that: The driving mechanism (51) comprises a driving member (513), a driven member drivingly connected to the driving member (513), a slider (512) arranged on the driven member, and a fixing seat mounted on the slider (512); the first camera module (52) and the second camera module (53) are arranged along the height direction of the fixing seat (56) and are mounted on the slider (512) via the fixing seat; the driving member (513) drives the driven member to make the slider (512) slide in a positive or reverse direction along the width direction of the cloth.

5. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 1 or 4, characterized in that: The first camera module (52) is provided with a plurality of first light sources at the outer diameter end of the first lens (521), and a light guide cover (522) is additionally provided at the outer periphery of the first light source, the side wall of the light guide cover (522) being used to project the light paths of the plurality of first light sources to the front of the first lens (521) of the first camera module (52).

6. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 5, characterized in that: The second camera module (53) is additionally provided with a light shield (532) at one end of the second lens (531); the backlight device (55) has a plurality of second light sources (553) arranged along the width direction of the cloth; the light shield (532) is configured to isolate light interference from the first light source and guide light from the second light source (553) to enter the second lens (531) of the second camera module (53).

7. A cloth detection device suitable for an open-width cloth winding machine as claimed in claim 1 or 6, characterized in that: The frame (1) is provided with a mounting seat (56) for fixing the shading member (54) and the backlight device (55); the light absorbing surface of the shading body (541) exceeds the light emitting surface of the backlight device (55), so that the light absorbing surface is closer to the cloth located between the first rubber roller group (2) and the second rubber roller group (3) than the light emitting surface.

8. A cloth detection method applicable to an open-width cloth winding machine, applied to the detection device according to any one of claims 1 to 7, comprising: S1: Within a predetermined operation time T1, based on a preset cloth rolling roller (4) operation speed V1, the cloth is conveyed from the first rubber roller group (2) to the second rubber roller group (3) by a length L1, and a sliding cycle time T2 of the first camera module (52) or the second camera module (53) is set by a control system. The sliding cycle time T2 is defined as the time of a single reciprocating stroke accumulated by the forward sliding stroke and the reverse sliding stroke of the first camera module (52) or the second camera module (53) from one end of the self-driving mechanism (51) to the other end. When the first camera module (52) is in a single reciprocating stroke, the shading member (54) is located within the effective viewing area of ​​the first camera module (52), and the effective viewing areas of the forward sliding stroke and the reverse sliding stroke captured by the first camera module (52) overlap with each other. The first positive collective image area and the second positive collective image area are respectively formed, and the overlapping part of the first positive collective image area and the second positive collective image area is the first overlapping area S1; when the second camera module (53) is in a single reciprocating stroke, the backlight device (55) remains always on and is located in the effective framing area of ​​the second camera module (53), and the effective framing areas of the forward sliding stroke and the reverse sliding stroke collected by the second camera module (53) are superimposed on each other to form the first reverse collective image area and the second reverse collective image area, and the overlapping part of the first reverse collective image area and the second reverse collective image area is the second overlapping area S2, so as to at least ensure that the first overlapping area S1 and the second overlapping area S2 can respectively basically fully cover the area of ​​the cloth sliding downward by a length of L1; S2: transmitting the real-time cloth images captured by the first camera module (52) and the second camera module (53) to the control system; S3: Based on the qualified template and threshold value preset in the control system, the real-time cloth image is analyzed and compared, the similarity between the real-time cloth image and the qualified template is calculated, and the similarity is compared with the threshold value; If the similarity is greater than the threshold, the real-time cloth image analysis result is qualified and the cloth winding machine continues to operate; If the similarity is less than the threshold, the real-time cloth image analysis result is unqualified and the cloth winding machine stops and alarms.

9. A cloth detection method suitable for an open-width cloth winding machine as claimed in claim 8, characterized in that: Controlling the sliding cycle time T2 of the first camera module (52) or the second camera module (53) by a control system further comprises: Based on a preset running speed V1 of the cloth rolling roller (4), a framing height H1 of the first camera module (52), and a framing height H2 of the second camera module (53), the time T3=MIN(H1, H2) / V1 for the cloth to pass through the minimum framing height MIN(H1, H2) is obtained, and the slip cycle time T2≤T3.

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