TW202403282A - Cloth detection device and method suitable for scutching cloth rolling machine - Google Patents

Abstract

A cloth detection device suitable for a scutching cloth rolling machine rotationally operates on a circular knitting machine and comprises a rack, a first rubber roller set and a second rubber roller set are arranged on the rack in parallel in a spaced mode, a cloth rolling roller is arranged on one side of the second rubber roller set, and an image acquisition module is arranged between the first rubber roller set and the second rubber roller set. The image acquisition module comprises a guide piece, a driving piece and a camera shooting module, the guide piece comprises a guide rail and a sliding block, the driving piece drives the sliding block to slide forwards or reversely in the length direction of the guide rail, the camera shooting module is arranged on the sliding block, and a lens of the camera shooting module carries out image acquisition towards the cloth.

Description

Cloth detection device and method for open width cloth rolling machine

The invention relates to the field of textile machinery, in particular to a cloth detection device and method suitable for open-width cloth rolling machines.

The open-width cloth rolling machine is a cloth rolling device used in circular knitting machines. The internal space of existing circular knitting machines is relatively limited. There are two main methods for testing fabrics produced. One of the methods is manual testing during the production process, that is, arranging Personnel use the naked eye to check regularly, and the other way is offline inspection, that is, after 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 require the accuracy of the human eye and the immediacy of the cloth inspection machine. There are deficiencies in this, which often lead to problems with poor batch performance.

To this end, the patent application with publication number CN214572888U discloses a real-time collection and processing mechanism for cloth images based on a knitting circular knitting machine. It is equipped with a camera and a light source on the inner wall of the knitting circular table to improve the real-time performance of cloth detection. However, when the camera detects, the cloth is wound on the cloth tube. Most of the cloth in the images captured by the camera is in a curved state, which is not conducive to comparison between the real-time image and the template, and the position of the camera is relatively fixed. , it is difficult to detect defects in areas far away from the camera, such as edge defects, and misjudgments are prone to occur. Therefore, the accuracy and comprehensiveness of detection need to be further improved.

Therefore, how to eliminate the above defects is the technical difficulty that the inventor of this case wants to solve.

The first purpose of this application is to provide a cloth detection device for an open-width cloth rolling machine. The cloth detection device has a simple structure and can complete the image detection of the front side of the cloth while the cloth is being transported, effectively improving the accuracy of the cloth detection. degree and comprehensiveness.

The second purpose of this application is to provide another cloth detection device that can complete image detection of the front and back of the cloth while the cloth is being transported, further improving the comprehensiveness of cloth detection.

The third purpose of this application is to provide a cloth detection method. By using this detection method in conjunction with a corresponding detection device, defects on the front side of the cloth can be effectively detected, and basically no missed detection will occur.

The fourth purpose of the present application is to provide a cloth detection method. By using this detection method and a corresponding detection device, defects on the front and back of the cloth can be effectively detected, and basically no missed detection will occur.

In order to achieve the above objectives, the present invention provides a cloth detection device and method for an open-width cloth winding machine. The open-width cloth winding machine rotates on a circular knitting machine and includes a cloth cutting device and a winding device. The cloth device is used to cut and unfold the annular cloth woven by the circular knitting machine. The winding device includes a frame, and a first rubber roller group and a second rubber roller group are arranged in parallel on the frame. There is a cloth take-up roller on one side of the second rubber roller group. The cut and unfolded cloth is straightened and flattened by the first rubber roller group and the second rubber roller group in sequence, and is finally wound up on the cloth take-up roller. It includes an image acquisition module and a control system. The image acquisition module includes a guide, a driver and a camera module. The driver and camera module are electrically connected to a control system externally. The guide includes a guide rail. and a slide block. The guide rail is arranged on the frame and is suspended across the transmission surface constructed by the discharge end of the first rubber roller group and the feed end of the second rubber roller group. The driving member drives the slide block. along guide rail Forward and reverse reciprocating sliding motion in the length direction, the camera module has a lens, the camera module is arranged on the slider, and its lens faces the transmission surface to collect images, and the control system uses at least After receiving the real-time image information collected by the camera module, and comparing and analyzing the real-time image information with its preset sample image, it can determine whether there are defects in the cloth on the transmission surface. Once the control system determines that the transmission There are defects in the cloth, and control instructions are sent out.

Further, the guide rail is arranged parallel to the first rubber roller group, and the lens of the camera module is arranged above the direction perpendicular to the front direction of the cloth.

Further, the camera module is provided with a plurality of first light sources at the outer diameter end of the lens, and a light guide cover is added to the outer periphery of the first light source. The side walls of the light guide cover are used to connect the plurality of first light sources. The light path of the light source is projected directly in front of the lens of the camera module.

Using the above structure, the camera module slides on the guide rail. On the one hand, the range captured by the camera module can completely cover the width of the cloth, making the detection more comprehensive. On the other hand, by adding a first light source, the camera can The images captured by the module can highlight the details of the cloth and increase the accuracy of image recognition.

In order to achieve the second purpose of the application, the present invention discloses a cloth detection device for an open-width cloth rolling machine. The cloth detection device is based on the first purpose cloth detection device, and the image acquisition module also includes A light-shielding member is arranged on the frame and is opposite to the lens of the camera module. The light-shielding member has a light-shielding body that matches the width of the cloth, and the light-shielding body is arranged parallel to the guide rail. At least the camera module The lens of the group corresponds to the light-shielding body in the corresponding position of the effective viewing area memory; the light-shielding body has a groove, and at least several second light sources are provided in the groove, and the second light source is electrically connected to the control system, and Configured as an auxiliary camera module to collect images of the reverse side of the cloth.

Using the above structure, the light shield effectively reduces the background noise collected by the camera module on the front of the cloth and improves the image contrast. Through the setting of the second light source, when the first light source is turned off and the second light source is turned on, the camera module can be positioned on the front of the cloth. The camera module can capture images from the reverse side of the cloth.

In order to achieve the third object of the present invention, the present invention discloses a cloth detection method for an open-width cloth rolling machine, which is applied to the first purpose cloth detection device and includes the following steps:

S1: Within the scheduled execution time T1, based on the preset cloth roller operating speed V1, the cloth is transported from the first rubber roller group to the second rubber roller group, and the slip cycle time of the camera module is controlled through the control system T2, the sliding cycle time T2 is defined as the time for the camera module to go through the accumulated stroke of the forward sliding stroke and the reverse sliding stroke from one end of the guide rail to the other end. When the camera module is equipped with the first light source, the The first light source is at least guaranteed to remain on when the lens is in working condition. When the camera module is in the forward sliding stroke, the effective viewing areas of the forward sliding stroke collected through the camera module are superimposed on each other to form the first forward set image. Image area, when the camera module is in the reverse sliding stroke, the effective viewing areas of the reverse sliding stroke collected through the camera module are superimposed on each other to form the first reverse collective image area, the first forward collective image area and The overlapped portion of the first reverse collection image areas is the first overlapping area, which at least ensures that the first overlapping area can substantially cover the entire length of the cloth being conveyed downward.

S2: Transmit the real-time cloth image collected by the camera module to the control system.

S3: The sample image and threshold are preset in the control system, analyzed and compared with the cloth image collected in real time, the similarity between the real cloth image and the sample image is calculated, and the similarity value is compared with the threshold value. Compare, if the sample image stored in the control system is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the real-time cloth image will be The image analysis result of the piece is qualified, and the cloth rolling machine continues to run. If the similarity value of the immediately collected cloth image analysis and comparison is less than the threshold, the instant cloth image analysis result is unqualified, and the cloth rolling machine stops and alarms. If The sample image stored in the control system is an unqualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the real-time cloth image analysis result is unqualified, and the cloth rolling machine will stop and alarm. If If the similarity value after analysis and comparison of the cloth image collected in real time is less than the threshold, the result of the real-time cloth image analysis is qualified and the cloth rolling machine continues to run.

Using the above method, within the scheduled execution time T1, the first overlapping area collected by the camera module can cover the area of the cloth conveying length, and the front-side detection of the cloth can be automatically and comprehensively completed. When the detection fails, the cloth rolling machine can automatically alarm , effectively reducing the labor intensity of workers and ensuring product quality.

In order to achieve the fourth object of the present invention, the present invention discloses a cloth detection method for an open-width cloth rolling machine, which is applied to a cloth detection device for the second purpose and includes the following steps:

S1: Within the scheduled execution time T1, based on the preset cloth roller operating speed V1, the cloth is transported from the first rubber roller group to the second rubber roller group, and the slip cycle time of the camera module is controlled through the control system T2, the sliding cycle time T2 is defined as the time that the camera module goes through the accumulated stroke of the forward sliding stroke and the reverse sliding stroke from one end of the guide rail to the other end. When the camera module is in the forward sliding stroke, And when the camera module is equipped with a first light source, the first light source is turned on, and the second light source is turned off at the same time, and the effective viewing areas of the forward sliding stroke collected by the camera module are superimposed on each other to form a second forward collective image area. , when the camera module is in the reverse sliding stroke, the first light source of the camera module is turned off, the second light source of the shading body is turned on, and the effective viewing areas of the reverse sliding stroke collected by the camera module are superimposed on each other to form The second reverse set image area, the second forward set image area and the second reverse set image area overlap each other Divide it into a second overlapping area, and at least ensure that the second overlapping area can basically cover the entire length of the cloth being conveyed downward.

S2: Transmit the real-time cloth image collected by the camera module to the control system.

S3: The sample image and threshold are preset in the control system, analyzed and compared with the cloth image collected in real time, the similarity between the real cloth image and the sample image is calculated, and the similarity value is compared with the threshold value. Compare, if the sample image stored in the control system is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the real-time cloth image analysis result is qualified, and the cloth rolling machine continues to run. If the similarity value after analysis and comparison of the immediately collected cloth image is less than the threshold, the immediate cloth image analysis result is unqualified, and the cloth rolling machine stops and alarms. If the sample image stored in the control system is an unqualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the result of the real-time cloth image analysis is unqualified, and the cloth rolling machine will shut down and alarm. If the similarity value after analysis and comparison of the cloth image collected in real time is If it is less than the threshold, the instant cloth image analysis result is qualified and the cloth rolling machine continues to run.

Using the above method, the second overlapping area collected by the camera module can cover the area of the cloth conveying length, and can automatically and comprehensively complete the detection of the front and back of the cloth. When the detection fails, the cloth rolling machine can automatically alarm, effectively mitigating the Reduce the labor intensity of workers and ensure the quality of products.

1:Rack

11:Rotating shaft

12: Fasteners

13: First limiter

14:Second limiting piece

2: The first rubber roller group

3: Second rubber roller group

4: Cloth rolling roller

5:Image acquisition module

51: Guide parts

511: Guide rail

512:Slider

52:Driving parts

53:Camera module

531:Lens

532:First light source

533:Light guide cover

54:Light-shading parts

541: Blackout subject

542: Groove

543:Second light source

544:Side panel

545: Open slot

T1: Scheduled execution time

T2: Slip cycle time

T3: Time to detect distance longitudinally through the field of view

V1: running rate

V2: average slip rate

L1: conveying length

L2: conveying length

L3: Overlapping area length

H: vertical detection distance of field of view

W: Horizontal detection distance of field of view

WS: periodic itinerary

WB: width of cloth

WD: working distance

S: small triangle area

FR: frame rate

X: direction

Y: direction

f: focal length

h: side length

w: side length

[Figure 1] is a schematic three-dimensional structural diagram of a cloth detection device provided by an embodiment of the present invention.

[Figure 2] is a schematic side view of the fabric detection device provided by the embodiment of the present invention. In this figure, the side plate of the frame is omitted, and the light shielding member is located in the first position.

[Figure 3] is a schematic side view of the image acquisition module in Figure 2.

[Figure 4] is a partial three-dimensional structural diagram of the image acquisition module provided by the embodiment of the present invention.

[Fig. 5] is a schematic three-dimensional structural diagram of the light-shielding member provided by the embodiment of the present invention.

[Figure 6] is a detailed view of the side panel part of the light shielding member in Figure 5.

[Figure 7] is a schematic side view of the fabric detection device provided by the embodiment of the present invention. In this figure, the side panel of the frame is omitted, and the light shielding member is located in the second position.

[Fig. 8] is a schematic diagram of the transformation between the first position and the second position of the light shield provided by the embodiment of the present invention.

[Fig. 9] is one of the three-dimensional structural schematic diagrams of the image detection module during operation according to the embodiment of the present invention.

[Figure 10] is the second schematic diagram of the three-dimensional structure of the image detection module during operation according to the embodiment of the present invention. The cloth is omitted in this figure.

[Figure 11] is a schematic diagram of the first forward set image area provided by the embodiment of the present invention.

[Fig. 12] is a schematic diagram of the first overlapping area based on Fig. 11 provided by an embodiment of the present invention.

[Fig. 13] is a coverage comparison diagram of the first overlapping area and the cloth conveying length area provided by the embodiment of the present invention.

[Figure 14] is an enlarged schematic diagram of area A in Figure 11.

[Figure 15] is a schematic diagram of the acquisition principle of the camera module provided by the embodiment of the present invention.

[Figure 16] shows the first state of the overlapping area provided by the embodiment of the present invention.

[Fig. 17] is the second state of the overlapping area provided by the embodiment of the present invention.

[Fig. 18] is the third state of the overlapping area provided by the embodiment of the present invention.

[Fig. 19] The second reverse set image area and the third reverse set image area in the first periodic stroke provided by the present invention Intersection diagram of the second forward set image area in the two-cycle journey.

[Figure 20] is a schematic diagram of the intersection of the collective image area in the first cycle and the collective image area in the second cycle.

In order to allow the examiner to conveniently and concisely understand other features and advantages of the present invention and the effects achieved by the present invention, the present invention is described in detail as follows with reference to the accompanying drawings:

Referring to Figure 1, a cloth detection device and method for an open-width cloth winding machine provided by the present invention will be described. The cloth winding machine is a cloth rolling device that rotates on a circular knitting machine, so the cloth detection device is synchronized It rotates with the cloth rolling machine and detects the cloth.

Please refer to Figures 2 to 4, a cloth detection device and method for an open-width cloth rolling machine, which includes:

Splitting device and winding device. The cutting device is used to cut and unfold the annular cloth woven by the circular knitting machine. The winding device includes a frame 1. The frame 1 is arranged in parallel. There are a first rubber roller group 2 and a second rubber roller group 3. Parallel here means that the axial directions of the first rubber roller group 2 and the second rubber roller group 3 are basically parallel and are separated by a predetermined length in a predetermined direction. Specifically, As shown in Figure 3, on the basis that the first rubber roller group 2 and the second rubber roller group 3 are substantially parallel in the axial direction, there are also gaps in the directions X and Y respectively. The second rubber roller group 3 There is a cloth rolling roller 4 on one side. The discharge end of the first rubber roller group 2 corresponds to the feeding end of the second rubber roller group 3. The discharge end of the second rubber roller group 3 corresponds to the cloth rolling roller. The feeding end of the roller 4, that is, the transmission surface for conveying cloth is formed between the discharging end of the first rubber roller group 2 and the discharging end of the second rubber roller group 3. It passes through the first rubber roller group 2 first. traction, and then through the second rubber roller group 3, and finally to the cloth winding roller 4 for winding. The cloth winding roller 4 is set at the power output end of the cloth winding motor. Through the winding traction of the cloth winding motor The tensioning of the cloth is realized.

An image acquisition module 5 is provided between the first rubber roller group 2 and the second rubber roller group 3. The image acquisition module 5 includes a guide part 51, a driving part 52, and a camera module 53. The driving part 52 and the camera module 53 are externally electrically connected to a control system. The guide 51 includes a guide rail 511 and a slider 512. The guide rail 511 is arranged on the frame 1 and is suspended across the discharge of the first rubber roller group 2. On the transmission surface constructed by the end and the feed end of the second rubber roller group 3, the guide rail 511 is arranged parallel to the first rubber roller group 2, and the driving member 52 drives the slider 512 in a positive direction along the length direction of the guide rail 511. The driving member 52 can be a combination of a motor and a chain, or a combination of a motor and a screw. The slider 512 is arranged on the chain or the screw, and the motor has a forward and reverse function. Motors, such as servo motors, stepper motors, etc.; in this embodiment, please refer to Figure 10, with the camera module 53 located at the rightmost end of the guide rail 511 as the starting point, forward sliding means that the camera module 53 moves from the guide rail 511 The rightmost end slides to the leftmost end of the guide rail 511. Reverse sliding means that the camera module 53 slides from the leftmost end of the guide rail 511 to the rightmost end of the guide rail 511. It should be noted that the forward and reverse directions are only used to distinguish the reciprocating sliding of the camera module 53. In the two stroke sections of the guide rail 511, when the starting reference points are different, the forward and reverse directions are also different, and are not limited to this; the camera module 53 is provided on the slider 512, and the camera module 53 is There is a lens 531, and the lens 531 of the camera module 53 faces the cloth to collect images. The camera module 53 moves with the slider 512. On the one hand, the range captured by the camera module 53 can accurately cover the width direction of the cloth. The two edges of the cloth make the detection more comprehensive. On the other hand, the image captured by the camera module 53 can highlight the local details of the cloth, that is, the detection accuracy is higher. The control system is at least used to receive the images collected by the camera module 53. real-time image information, and compare and analyze the real-time image information with its preset template. Once the analysis result is unqualified, a feedback command will be sent to the outside. The forms of fabric defects that result in unqualified results include: broken needles, oil yarn, oil stains, holes, horizontal stripes, etc. Specifically, broken needles refer to cracks along the warp lines on the cloth surface, usually at the ends. Forming a hole, oil stain refers to oil on the machine or floating in the air. Black oil spots are caused by floating dust contaminating the cloth surface. Oil yarn refers to the original yarn containing oil or dirt, which will form weft-like long strip defects on the cloth surface. Holes refer to the cloth surface. The upper yarn has been broken and there are holes. The horizontal bars refer to the occurrence of some abnormal continuous horizontal loops in the cylindrical knitted fabric. The object that sends feedback instructions here is that when the test fails, a response needs to occur. Electrical devices, such as driving parts 52, alarms, cloth rolling motors, etc., control instructions include but are not limited to start and stop signals of electrical devices, such as alarm start signals, winding motor stop signals.

It can be understood that cloth is a material used to make clothes. Clothes have an outer surface and an inner surface that are in contact with the human body. The outer surface of clothes directly affects the perception of the viewer, so the outer surface has higher aesthetic requirements than the inner surface, that is, The control of defects is also more stringent. The front side of the cloth mentioned in this embodiment refers to the side of the cloth used as the outer surface of the clothes. Furthermore, the lens 531 of the camera module 53 is arranged perpendicular to the front side of the cloth. In the upper direction, the advantage of the lens 531 being vertically arranged on the cloth is that the image of the cloth entering the lens 531 will not be tilted at an angle, and the image captured by the camera module 53 can more accurately restore the actual image, which is beneficial to discovering the texture on the cloth. Flaws.

In this embodiment, as shown in Figure 3, the distance between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3 is the transmission distance. In the prior art, based on the above two rubber roller groups It only plays the role of traction and guidance, so the transmission distance between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3 is generally relatively short. In this case, due to the addition of the image acquisition module 5 , it is necessary to ensure that there is a long enough time when the cloth is transferred 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 speed, and within this long enough time, the camera module 53 can be moved along the guide rail When 511 slides in the length direction, the image of the cloth in a flat state can be captured. At the same time, since the image acquisition module 5 also occupies a certain space, it is necessary to connect the discharge end of the first rubber roller group 2 with the second The transmission distance between the feeding ends of the rubber roller group 3 is appropriately enlarged to facilitate the operator to wind the cloth from the first rubber roller group 2 to the second rubber roller group. Roller group 3 performs cloth winding operation.

Compared with the existing technology, the cloth detection device provided in this embodiment sets the transmission distance of the cloth through the first rubber roller group 2 and the second rubber roller group 3, and the camera module 53 for sliding viewfinding, so that the cloth continuously While being transported, the camera module 53 can capture continuous and flat images of the cloth during the reciprocating sliding process, and can accurately cover both edges of the cloth in the width direction, which can be used to detect cloth defects.

Referring again to Figures 2 and 3, a transmission surface is constructed between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3, and the image acquisition module 5 is located between the transmission surface and the cloth roll. Between the rollers 4, it should be noted that the front side of the cloth transported by the existing open-width cloth rolling machine is facing the direction of the cloth rolling roller 4, so the image acquisition module 5 is set on the inside, which is also based on the front side of the cloth. Detection considerations. In addition, the distance in the direction The spacing in the direction X can make the structure of the cloth detection device more compact while satisfying the front-side detection of the cloth.

As shown in Figure 4, in this embodiment, the camera module 53 is provided with at least two first light sources 532 at the outer diameter end of the lens 531. The first light sources 532 can be arranged symmetrically around the axis of the lens 531. , and a light guide cover 533 is added to the outer periphery of the first light source 532. The light guide cover 533 covers the front end of the lens 531 to prevent stray light from other positions from affecting the lens 531. The light guide cover 533 also has The side wall is used to project the light paths of several first light sources 532 directly in front of the lens 531 of the camera module 53, that is, the light paths of the first light sources 532 cover the path area between the lens 531 and the cloth, so that the lens 531 can obtain clearer cloth images.

This embodiment also provides a cloth detection method for an open-width cloth rolling machine, which is applied to the above-mentioned cloth detection device. The method is suitable for the camera module 53 to correct the cloth during the sliding process. The above-mentioned image collection is required, and at least ensures that the camera module 53 will basically not cause the cloth to be missed during the transportation process. The specific steps include the following:

S1: Within the scheduled execution time T1, based on the preset running speed V1 of the cloth rolling roller 4, the cloth is transported from the first rubber roller group 2 to the second rubber roller group 3 by a length L1, and the camera module 53 is controlled through the control system The sliding cycle time T2 is defined as the time the camera module 53 travels through the accumulated forward sliding stroke and reverse sliding stroke from one end of the guide rail 511 to the other end, that is, the camera module 53 53 takes one end of the guide rail 511 as the starting point. After the sliding cycle time T2, the total sliding stroke is the accumulation of the forward sliding stroke and the reverse sliding stroke, and the camera module 53 returns to the starting point. When the camera module 53 When the first light source 532 is provided, the first light source 532 is at least guaranteed to remain on continuously when the lens 531 is in the working state. When the camera module 53 is in the forward sliding stroke, the forward sliding stroke collected through the camera module 53 The effective viewing areas are superimposed on each other to form the first forward collective image area. When the camera module 53 is in the reverse sliding stroke, the effective viewing areas collected through the reverse sliding stroke of the camera module 53 are superimposed on each other to form the first reverse direction. Collection image area, in which the first forward collection image area and the first reverse collection image area both capture images of the front side of the cloth, and the first forward collection image area and the first reverse collection image area overlap each other The part is the first overlapping area, which at least ensures that the first overlapping area can basically fully cover the area of the cloth conveying length L1 downward. In this embodiment, basically full coverage means that within the predetermined execution time T1, the first overlapping area The proportion range of the area covering the downward conveying length L1 area of the cloth is 90%-100%.

S2: Transmit the real-time cloth image collected by the camera module 53 to the control system.

The camera module 53 and the control system can realize data transmission through a dedicated data line.

S3: Control the sample image and threshold in the system, where the sample image can be There are two classifications. The first classification is qualified sample images, and the second classification is unqualified sample images. The threshold refers to the comparison between real-time image information and sample images. The two reach a similar minimum value. If the control system stores The sample image is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the result of the real-time cloth image analysis is qualified, and the cloth rolling machine continues to run. If the cloth image collected in real time is If the similarity value after analysis and comparison is less than the threshold, the immediate cloth image analysis result is unqualified, and the cloth rolling machine stops and alarms. If the sample image stored in the control system is an unqualified sample image: If the cloth image collected in real time If the similarity value after analysis and comparison is greater than the threshold, the instant cloth image analysis result will be unqualified, and the cloth rolling machine will shut down and alarm. If the similarity value after analysis and comparison of the immediately collected cloth image is less than the threshold, the instant cloth image will be displayed. The image analysis result is qualified and the cloth rolling machine continues to run.

By adopting the above method, within the scheduled execution time T1, the first overlapping area collected by the camera module 53 can basically cover the area of the cloth conveying length L1, and the front-side detection of the cloth can be automatically and comprehensively completed. When the detection fails, The cloth rolling machine can automatically alarm, effectively reducing the labor intensity of workers and ensuring product quality.

The following mainly describes the S1 step in detail:

The first is the establishment of the analysis model. In actual application scenarios, while the camera module 53 slides horizontally along the guide rail 511, the cloth is transported downwards. It is difficult to analyze when the camera module 53 and the cloth are both moving. . Therefore, assuming that the cloth is stationary in the analysis model, it can be understood that the movement of the camera module 53 includes horizontal sliding and movement in the opposite direction of the cloth transmission direction, and in general, The sliding speed of the camera module 53 is fixed.

Secondly, there is an analysis of the working process and principle of this method. It is preset that the horizontal field of view detection distance W and the vertical field of view detection distance H of the viewfinder unit of the camera module 53 are preset. The horizontal field of view detection distance H is The detection distance W is the actual lateral length of the detection area in the field of view of the lens 531, the vertical detection distance H of the field of view is the actual longitudinal length of the detection area in the field of view of the lens 531, and based on the periodic stroke WS of the camera module 53 sliding, here the periodic stroke WS It is defined as the accumulation of the forward sliding stroke and the reverse sliding stroke of the camera module 53 from one end of the guide rail 511 to the other end. In order to facilitate the description of the following formula, this case temporarily replaces the periodic stroke with WS to facilitate the understanding of the review committee. , as long as the effective viewing area of the camera module 53 at both ends of the guide rail 511 can cover both edges of the cloth in the width direction, so the periodic stroke WS is a floating interval. The stroke value of the periodic stroke WS in this embodiment is The wide WB value is 2 times, please refer to Figure 10. The camera module 53 is located at the rightmost end of the guide rail 511 as the starting point. The camera module 53 slides from the rightmost end to the leftmost end of the guide rail 511 as the forward sliding, and vice versa. Reverse slip. Then, the effective viewing areas captured by the forward sliding movement of the camera module 53 are superimposed on each other to form a collective image area as the first forward collective image area, and the various effective viewing areas captured by the reverse sliding movement of the camera module 53 are superimposed on each other to form a collection. The image area is used as the first reverse collection image area, in which the first forward collection image area and the first reverse collection image area both collect images of the front side of the cloth; as shown in Figure 11, the upper and lower ends of Figure 11 They are the first rubber roller group 2 and the second rubber roller group 3 respectively. The cloth is located between the first rubber roller group 2 and the second rubber roller group 3. The solid path frame in the middle of the cloth is the first forward collective image area. , as shown in Figure 12, in a slip cycle time T2, the solid line path frame in the middle of the cloth is the first forward collection image area, the dotted line path frame is the first reverse collection image area, the first forward collection image area The section line area where the set image area intersects with the second reverse set image area is the first overlapping area, and the conveying length L2 of the cloth moving downward at this time is as shown in Figure 13. The first overlapping area in Figure 12 is intercepted. , and perform coverage comparison with the area of the conveying length L2 where the cloth moves downward. As long as the first overlapping area covers the area of the conveying length L2 where the cloth moves downward, detection will not be missed. Of course, what is shown in Figure 13 is the first overlapping area, which is the first forward set image area and the first forward set image area in the same slip cycle time T2. A special case of overlapping inverse collection image areas to aid understanding. Similarly, at the scheduled execution time T1, there are multiple slip cycle times T2, and the first overlapping area can basically cover the cloth being transported from the discharge end of the first rubber roller group 2 to the feed end of the second rubber roller group 3. For the area of length L1, for the convenience of marking in the drawing, the distance between the discharge end of the first rubber roller group 2 and the feed end of the second rubber roller group 3 is directly marked as the conveying length L1. In fact, the conveying length The length of L1 depends on the length of the set execution time T1 and the speed of the circular knitting machine.

It should be noted that it is known that the movement path of the camera module 53 is tilted relative to the cloth. Please refer to Figure 11 and Figure 14. Figure 14 shows an enlarged schematic diagram of area A in Figure 11. At this time, the actual movement path in Figure 11 The line path frame is the first forward collection image area. There are two boxes in the figure respectively representing the two adjacent effective viewing areas during the sliding process. To help understanding, the two effective viewing areas in this figure are The adjacent edges overlap, and the two effective viewing areas are staggered by a small distance from each other in the cloth conveying direction. Therefore, there are gaps between the bottom and top of the two effective viewing areas and the solid path frame, that is, there are two small triangular areas respectively. S, the small triangular area S is the blind area of detection. When the running speed V1 of the cloth roller 4 is slower, the sliding speed of the camera module 53 is slower, and the frame rate FR of the camera module 53 is larger, the small triangular area S is smaller. Overall, the small triangular area S accounts for a very small proportion; therefore, when the running speed V1 of the cloth rolling roller 4 and the slip cycle time T2 are matched, the first overlapping area can transport the cloth downward for the length L1 The area is basically fully covered, and there is basically no missed detection. According to the running speed V1 of the cloth roller 4, the slip cycle time T2, and the above analysis model, it can be concluded that the camera module 53 has three types of first forward collection image area, first and reverse collection area within a cycle. Overlay results:

Please refer to Figures 3 and 16 to 18. Figures 16 to 18 show three states of the overlapping area. In the embodiment, that is, within one cycle, the first forward set of the camera module 53 There are three states of the first overlapping area where the combined image area intersects with the first reverse set image area. Specifically, the first forward set image area acquired by the forward sliding stroke of the camera module 53 is as shown in the figure. The solid line path box in the middle of the cloth is shown, and the first reverse set image area obtained by the reverse sliding stroke is shown in the dotted path box in the middle of the cloth. The overlapping part of the two is the first overlapping area, as shown in the cloth. As shown in the middle cross-section area, the length L3 of the first overlapping area is defined as the length of the perpendicular line between the rightmost end point of the first overlapping area and the leftmost line segment; in a slip cycle time T2, the conveying length L2 of the cloth in Figure 16 is greater than the longitudinal direction of the field of view The detection distance H, the length L3 of the first overlapping area is less than the width WB of the cloth. At this time, there is a gap area between the first reverse set image area at the upper right end and the first forward set image area at the lower right end. , that is, there is a missed detection area; in Figure 17, the conveying length L2 of the cloth is equal to the longitudinal detection distance H of the field of view, and the length L3 of the first overlapping area is equal to the width WB of the cloth, but the rightmost end of the first overlapping area has only one endpoint, so When the first reverse set image area at the upper right end and the first forward set image area at the lower right end just do not have a gap area; the conveying length L2 of the cloth in Figure 18 is less than the longitudinal detection distance H of the field of view, the first overlap The area length L3 is equal to the width WB of the cloth, and there are two endpoints at the rightmost end of the first overlapping area. At this time, the first reverse set image area at the upper right end and the first forward set image at the lower right end There is no gap area in the area, and the area of the first overlapping area is larger than the area of the first overlapping area in Figure 17; that is, at least ensuring that the length L3 of the first overlapping area can cover the width WB of the cloth, basically no missed detection will occur.

Further, the slip cycle time T2 of the camera module 53 is controlled through the control system, including: please refer to Figures 11 to 13, Figure 15, Figure 16 to Figure 18. Figure 15 is the acquisition principle of the camera module 53, based on cloth. For wide WB, the preset periodic stroke WS of the camera module 53 sliding on the guide rail 511 is defined as the forward sliding stroke of the camera module 53 from one end of the guide rail 511 to the other end and The accumulation of reverse sliding strokes, when the camera module 53 is located at the end points of the two strokes of the periodic stroke WS, the collective image area constructed by the camera module 53 at least includes the two edges of the cloth in the width direction of the cloth; and then based on the predetermined Assuming the working distance WD between the lens 531 and the cloth, the focal length f of the camera module 53, and the side length h of the target surface of the camera module 53 parallel to the cloth conveying direction, the longitudinal detection of the field of view of the camera module 53 along the cloth conveying direction is obtained. The distance H=h*WD/f. In the same way, the horizontal detection distance W of the field of view of the camera module 53 along the width direction of the cloth can also be obtained based on the side length w of the target surface of the camera module 53 that is parallel to the width direction of the cloth. =w*WD/f, then the visual field horizontal detection distance W and the visual field longitudinal detection distance H of the viewing field of view unit in the effective viewing area of the camera module 53 are both determined. Of course, the resolution of the camera module 53 should meet the shooting requirements. Here No more details;

T3，攝像模組53的平均滑移速率V2=WS/T2。 According to the above three results, if no missed detection occurs, during the sliding cycle time T2 of the camera module 53, the conveying length L2 of the cloth should be equal to or less than the longitudinal detection distance H of the field of view. In the same way, when the value of the cloth conveying length is the longitudinal detection distance H of the field of view, the camera module 53 should complete at least one slip cycle time T2; that is, based on the preset running speed V1 of the cloth rolling roller 4, due to the cloth rolling The running speed V1 of the roller 4 is adapted to the weaving speed of the circular knitting machine. Therefore, the running speed V1 of the cloth-winding roller 4 is predetermined. The field of view of the camera module 53 detects the distance H longitudinally to obtain the cloth passing field of view. The time for the longitudinal detection distance H is T3 = H/V1, where the time T3 for the cloth to pass through the longitudinal detection distance H of the field of view refers to the time it takes for the cloth to move down and the conveying length reaches the longitudinal detection distance H of the field of view, and the slip cycle time T2

T3, the average slip rate of the camera module 53 is V2=WS/T2.

WB，可得FR

2WB/(W*T2)。在理想的情況下，即捲布輥筒4的運行速率V1及滑移週期時間T2相適配，且幀率足夠高的情況下，可以保證第一重疊區域完全覆蓋布匹向下輸送長度L1的區域，但用這種方式，相鄰圖片間的重疊區域比例會很高，雖然完全不會造成漏檢，但是會使攝像模組53在滑移週期時間T2採集過程中生成大量的圖片，大量的圖片意味著將產生大量的資料，一方面會對資料傳輸造成延遲卡頓，另一方面控制系統需在滑移週期時間T2不斷地計算處理比對輸出結果，如果硬體算力不足即在滑移週期時間T2控制系統不足以消化攝像模組53生成的圖片，還容易造成程式死機，再者控制系統還要將圖片保存下來，而頻繁保存大量圖片會佔用控制系統大量的運行記憶體，同樣會造成程式運行卡滯。因而在保證基本全覆蓋的基礎上，合理設置幀率FR，透過犧牲小部分區域，即讓集合圖像區域中相鄰圖片的邊緣是相互重合的，此時如圖14所示，小三角區域S的面積會大一些，但換取了資料傳輸、程式算力、記憶體佔用等資源優化，使得圖像採集檢測過程更加順暢。 Further, the frame rate FR of the camera module 53 is set. The frame rate FR of the camera module 53 refers to the number of shots taken by the camera module 53 per second. Therefore, FR is an integer value. When the camera module 53 1/2 sliding cycle time T2, that is, the camera module 53 can complete the sliding between the rightmost end and the leftmost end of the guide rail 511, and the first forward collective image area of the camera module 53 covers the width of the cloth. , when adjacent pictures in the first forward collection image area are seamlessly connected to each other, the sum of the visual field lateral detection distances W of each picture in the first forward collection image area should be greater than or equal to the cloth Width, i.e. FR*T2/2*W

WB, available FR

2WB/(W*T2). In an ideal situation, that is, if the running speed V1 of the cloth rolling roller 4 and the slip cycle time T2 are matched, and the frame rate is high enough, it can be ensured that the first overlapping area completely covers the downward conveying length L1 of the cloth. area, but in this way, the proportion of overlapping areas between adjacent pictures will be very high. Although it will not cause missed detection at all, it will cause the camera module 53 to generate a large number of pictures during the acquisition process of the slip cycle time T2, and a large number of The picture means that a large amount of data will be generated. On the one hand, it will cause delays in data transmission. On the other hand, the control system needs to continuously calculate, process and compare the output results during the slip cycle time T2. If the hardware computing power is insufficient, it will The slip cycle time T2 control system is not enough to digest the pictures generated by the camera module 53, and it is easy to cause the program to crash. Furthermore, the control system also needs to save the pictures, and frequently saving a large number of pictures will occupy a large amount of running memory of the control system. It will also cause the program to run stuck. Therefore, on the basis of ensuring basically full coverage, the frame rate FR is set reasonably by sacrificing a small area, that is, allowing the edges of adjacent pictures in the collection image area to overlap each other. At this time, as shown in Figure 14, the small triangle area The area of S will be larger, but in exchange for resource optimization such as data transmission, program computing power, and memory usage, the image acquisition and detection process will be smoother.

T3即可，在實際生產中，滑移週期時間T2=20s，即在一分種內，攝像模組53往復滑移三次，就能完成布匹正面圖像的檢測。進一步地，V2=WS/T2=3600/20=180mm/s，FR

3600/(40*20)=4.5，取整得FR幀率至少為5FPS。 The actual production parameters of a 96-channel circular knitting machine are used as an example to illustrate the formula. It is known that the width of the fabric produced is 1800mm, and the preset cycle stroke WS of the camera module 53 is twice the width, that is, 3600mm. The existing circular knitting machine has a It can rotate 13 times in a minute, and the length of the cloth woven by the circular knitting machine in one revolution is 15mm. At the same time, the conveying length of the cloth in one revolution of the circular knitting machine is 15mm. In one minute, the length of the cloth knitted by the circular knitting machine is 15mm. The conveying length L1=15*13=195mm, it can be seen that the running speed of the cloth roller 4 is V1=L1/T1=195/60=3.25mm/s. Based on the preset camera module 53, the chip target surface is 4mm long and 4mm wide. 2mm, the focal length is 8mm, and the working distance between the lens 531 and the cloth is 160mm. It can be seen that the horizontal detection distance of the field of view of the camera module 53 is W=2*160/8=40mm, and the longitudinal detection distance of the field of view is H=4*160/8=80mm. Further, Ground, the time for the cloth to pass through the longitudinal detection distance H of the field of view is T3=H/V1=80/3.25=24.6s, then the sliding cycle time T2 of the camera module 53

T3 is enough. In actual production, the sliding cycle time T2=20s, that is, within one minute, the camera module 53 slides back and forth three times to complete the detection of the front image of the cloth. Further, V2=WS/T2=3600/20=180mm/s, FR

3600/(40*20)=4.5, the rounded FR frame rate is at least 5FPS.

Please refer to Figure 3, in which the present invention provides a preferred embodiment, which is further improved on the basis of the cloth detection device of Embodiment 1. The difference is that the image acquisition module 5 also includes a light shielding member 54 , the light shielding member 54 is provided with a second light source 543 configured to assist the camera module 53 in collecting images of the reverse side of the cloth. It should be noted that the cloth is formed by cross-woven fabrics. There are many small pores between the fabrics, which are not completely closed and opaque. Therefore, the physical background located on the back of the cloth will affect the cloth collected by the camera module 53. Frontal images create interference. In order to eliminate interference, a light-shielding member 54 is added. The light-shielding member 54 can be made of an opaque material such as a wooden board or a metal plate, or has a light-absorbing coating such as a black coating. By providing the light-shielding member 54, the light-shielding member 54 can be effectively reduced. It reduces background noise and improves image contrast, making the image collection of the front of the cloth more accurate.

Please refer to Figures 5 to 8. Specifically, the light shielding member 54 is arranged on the frame 1 and is opposite to the lens 531 of the camera module 53. That is, the lens 531 and the light shielding member 54 of the camera module 53 are respectively located on the cloth. On both sides of the front and back, the light shielding member 54 has a light shielding body 541 that matches the width of the cloth, and the light shielding body 541 is arranged parallel to the guide rail 511. At least the camera module 53 The lens 531 corresponds to the light shielding body 541 in the corresponding position of the effective viewing area memory. It can be understood that the camera module 53 slides on the guide rail 511, and its viewing area located at both ends of the guide rail 511 at least covers both edges of the cloth in the width direction. There may be areas that do not belong to the cloth. Therefore, The effective viewing area refers to the viewing area corresponding to the cloth. As long as the light shielding body 541 is arranged in the effective viewing area, it can enhance the front detection of the cloth. Please refer to Figure 5, Figure 9 and Figure 10. In this embodiment, the light shielding body 541 also has a groove 542, the cross section of the groove 542 is U-shaped, and at least a number of A plurality of second light sources 543 can be arranged along the length direction of the groove 542. A plurality of the second light sources 543 can also be arranged along the width of the groove 542. The second light source 543 is connected to the control The system is electrically connected and configured to assist the camera module 53 in collecting images of the reverse side of the cloth. Specifically, when the camera module 53 is in the forward sliding stroke and the camera module 53 is equipped with the first light source 532, the first light source 532 of the camera module 53 is turned on, and the second light source 543 of the light shielding body 541 is turned off. And through the effective viewing areas of the forward sliding stroke collected by the camera module 53, they are superimposed on each other to form a forward collective image area, that is, the camera module 53 realizes the image collection of the front side of the cloth; when the camera module 53 is in the reverse sliding state, During the movement, the first light source 532 of the camera module 53 is turned off, the second light source 543 of the light shielding body 541 is turned on, and the effective viewing areas of the reverse sliding stroke collected by the camera module 53 are superimposed on each other to form a reverse set image. The image area, that is, the camera module 53 realizes image collection of the reverse side of the cloth. In summary, by arranging the second light source 543 on the light shield 54, in addition to the basic function of the camera module 53 to collect the front image of the cloth, the camera module 53 can also cooperate with the first light source 532 and the second light source 543. It has the function of collecting images from the reverse side of cloth, which greatly improves the comprehensiveness of cloth detection and effectively reduces the probability of missed detection.

When the cloth detection failure occurs, the cloth needs to be processed manually. In order to facilitate the operation of the staff, further, the light shielding member 54 is set to create a gap between the frame 1 and the light shielding member 54 . At least when the light shielding member 54 is in the first position, it is in the effective viewing area corresponding to the lens 531 of the camera module 53; when the light shielding member 54 is in the second position, it is in the effective viewing area from the lens of the camera module 53 531 moves away from the effective viewing area to facilitate workers to carry out cloth loading operations from the first rubber roller group 2 to the second rubber roller group 3. The first position refers to the working position of the light shielding member 54 when the image acquisition module 5 is operating normally. At this time, the light shielding body 541 is in the effective viewing area corresponding to the lens 531 of the camera module 53 and is basically in contact with the guide rail 511. Parallel, the second position refers to the placement position of the light-shielding member 54 during the manual cloth loading process when the image acquisition module 5 stops operating. At this time, it is at least ensured that the light-shielding member 54 is not corresponding to the lens 531 of the camera module 53 Within the effective viewing area to facilitate operation.

Specifically, the light shielding member 54 also includes two side plates 544, and the light shielding body 541 is disposed between the two side plates 544. One end of the side plate 544 can be connected to the frame 1 by the rotating shaft 11 provided on the frame 1. Rotatingly pivoted. In this embodiment, one end of the side plate 544 that is pivotally connected to the frame 1 is specifically the lower end of the side plate 544. A connected opening slot 545 is also provided at the adjoining position between the light shielding body 541 and the side plate 544. The opening on the light shielding body 541 is larger than the opening on the side plate 544. The frame 1 is provided with a fastener 12, which penetrates the opening groove 545 and presses the side plate 544 against the frame 1. , so that the light-shielding member 54 is fixed in the first position. Wherein, the fastener 12 can be a locking screw threadedly connected to the frame 1 , the opening slot 545 is used for the light-shielding member 54 to give way to the fastener 12 when the light-shielding member 54 rotates around the rotation axis 11 , and the light-shielding body 541 The opening on the main body 541 is used to accommodate the head of the locking screw, and the opening on the side plate 544 is used to accommodate the rod of the locking screw. Therefore, the opening on the light shielding body 541 is larger than the opening on the side plate 544 . In addition, through the arrangement of the opening groove 545, when the light shielding member 54 is rotated, there is no need to remove the fastener 12, and only need to loosen the fastener 12, making the operation simple and convenient. Please refer to Figure 8. The frame 1 is also provided with a first limiter 13 and a second limiter 14 respectively. The first limiter 13 and the second limiter 14 are respectively connected to the side. Both sides of the plate 544 are limited against each other, so that the light shielding member 54 switches between the first position and the second position with the rotating shaft 11 as the rotation axis. The first limiter 13 and the second limiter 14 are first limit screws and second limit screws fixed to the frame 1, and the stems of the limit screws are threadedly connected to the frame 1. The head of the limiting element screw is configured to abut against the side plate 544 . When the light-shielding member 54 is to be rotated from the first position to the second position, only the fastener 12 is loosened, the light-shielding member 54 is rotated, and the light-shielding member 54 is rotated around the rotating axis 11. At the same time, the locking screw is rotated out of the opening slot 545 until the light-shielding member 54 is rotated. By pressing the side against the head of the second limiting screw, the light-shielding member 54 can be limited in the second position without any additional operation; when the light-shielding member 54 is to be rotated from the second position to the first position, only It is necessary to rotate the light shield 54 so that the light shield 54 rotates around the rotating axis 11 until the side of the light shield contacts the head of the first limiting screw to complete the preliminary limit. At the same time, the locking screw is turned into the opening slot 545 and then tightened. Screws are used to fasten the light-shielding member 54.

This embodiment also provides a cloth detection method suitable for open-width cloth rolling machines. The method is suitable for the camera module 53 to collect images of the front and back sides of the cloth during the sliding process, and at least ensures that the cloth is conveyed during the transportation process. , the camera module 53 will basically not cause the front and back sides of the cloth to be missed. The specific steps include the following:

S1: Within the scheduled execution time T1, based on the preset running speed V1 of the cloth rolling roller 4, the cloth is transported from the first rubber roller group 2 to the second rubber roller group 3 by a length L1, and the camera module 53 is controlled through the control system The sliding cycle time T2 is defined as the time that the camera module 53 travels through the accumulated forward sliding stroke and reverse sliding stroke from one end of the guide rail 511 to the other end. When the camera module 53 53 is in the forward sliding stroke, and the camera module 53 is equipped with the first light source 532, the first light source 532 is turned on, and the second light source 543 is turned off at the same time, and the forward sliding stroke collected through the camera module 53 is effective. The viewing areas are superimposed on each other to form a second forward collective image area. When shooting The image module 53 is in the reverse sliding stroke, the first light source 532 of the camera module 53 is turned off, the second light source 543 of the light shielding body 541 is turned on, and each effective view is captured through the reverse sliding stroke collected by the camera module 53 The areas overlap each other to form a second reverse collection image area. The overlapping portion of the second forward collection image area and the second reverse collection image area is the second overlapping area, which at least ensures that the second overlapping area can move the cloth to The area of the lower conveying length L1 is basically fully covered; in this embodiment, basically full coverage means that within the predetermined execution time T1, the proportion interval of the second overlapping area covering the area of the downward conveying length L1 of the cloth is 90%- 100%;

S2: Transmit the real-time cloth image collected by the camera module 53 to the control system;

The camera module 53 and the control system can realize data transmission through a dedicated data line.

S3: Sample images and thresholds are preset in the control system. The sample images can be classified into two categories. The first classification is qualified sample images, and the second classification is unqualified sample images. The threshold refers to the instant image. The image information is compared with the sample image, and the two reach the minimum similarity value. If the sample image stored in the control system is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, then The result of the instant cloth image analysis is qualified, and the cloth rolling machine continues to run. If the similarity value of the immediately collected cloth image analysis and comparison is less than the threshold, the instant cloth image analysis result is unqualified, and the cloth rolling machine stops and alarms. If the sample image stored in the control system is an unqualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the real-time cloth image analysis result is unqualified, and the cloth rolling machine will stop and alarm. If the similarity value after analysis and comparison of the immediately collected cloth image is less than the threshold, the result of the instant cloth image analysis is qualified and the cloth rolling machine continues to run.

Using the above method, the collective image area collected by the camera module 53 can cover the cloth The area with conveying length L1 can automatically and comprehensively complete the detection of the front and back of the cloth. When the detection fails, the cloth rolling machine can automatically alarm, effectively reducing the labor intensity of workers and ensuring the quality of the product.

The difference between the cloth detection method of this embodiment and the cloth detection method of Embodiment 1 is that: the camera module 53 collects images of the front and back of the cloth, and when the camera module 53 collects images of the back of the cloth, the The lighting strategy of the first light source 532 and the second light source 543 is different from that when the camera module 53 collects the front image of the cloth.

It should be noted that in the description of the cloth detection method in Embodiment 1, the first forward set image area and the first reverse set image area are mentioned, while the second forward set image is provided in the second embodiment. area and the second reverse collection image area; the connection is that the first forward collection image area and the second forward collection image area are both defined as the collection image area collected by the camera module 53 during the forward sliding stroke , similarly, the first reverse collection image area and the second reverse collection area are the collection image areas collected by the camera module 53 during the reverse sliding stroke; the difference is that the first forward collection image area and the first reverse collection image area The reverse collection image area collects images of the front side of the cloth when the first light source 532 is always on, while the second forward collection image area in the second embodiment is when the first light source 532 remains on. In the scene where the second light source 543 is turned off, the image of the front side of the cloth is collected. The second reverse collection image area is in the scene where the first light source 532 is turned off and the second light source 543 remains on. The image of the back side of the cloth is collected. Like collection.

Step S1 is described below with reference to Figures 3, 10, 16 to 18 and 19 to 20:

The periodic stroke WS is defined as the accumulation of the forward sliding stroke and the reverse sliding stroke of the camera module 53 from one end of the guide rail 511 to the other end. The sliding period time T2 is the period of the camera module 53 The time it takes to pass the cycle stroke. In the first cycle stroke, when the camera module 53 is in the forward sliding stroke and the camera module 53 is equipped with the first light source 532, the first light source 532 of the camera module 53 is turned on. , the second light source 543 is turned off, and the effective viewing areas of the forward sliding stroke collected through the camera module 53 are superimposed on each other to form a second forward collective image area. When the camera module 53 is in the reverse sliding stroke, the The first light source 532 of the camera module 53 is turned off, the second light source 543 of the light shielding body 541 is turned on, and the effective viewing areas of the reverse sliding stroke collected by the camera module 53 are superimposed on each other to form a second reverse collective image area. Figures 16 to 18 show the three states of the overlapping area, which are basically consistent with the description of Embodiment 1, except that only the front image of the cloth is collected in the second forward collection image area of the first cycle, and the second reverse collection The image area only collects images of the reverse side of the cloth, so the second overlapping area collects images of both the front and back sides of the cloth. As shown in Figure 19, when the camera module 53 performs the second cycle of travel, the second cycle of the second cycle of travel The two forward set image areas cover the second reverse set image area where the first periodic stroke does not overlap, so as to realize the front image collection of the cloth in this area. Through the complementary image collection of the front and back sides of the adjacent periodic strokes of the camera module 53, as long as the second overlapping area can basically fully cover the area of the length L1 of the cloth being conveyed downward, the front and back image collection of the cloth can be completed. And it will not cause missed detection.

Although Embodiment 2 additionally detects the reverse side of the cloth, the principle of achieving at least basically no missed detection in Embodiment 2 is the same as Embodiment 1, and is therefore also based on the cooperation of the running speed V1 of the cloth roller 4 and the slip cycle time T2 Differently, the camera module 53 has three superposition results of the second forward collection image area and the reverse collection area within one cycle: the conveying length L2 of the cloth in Figure 16 is greater than the longitudinal detection distance H of the field of view, and the length of the second overlapping area is L3 is smaller than the width WB of the cloth. At this time, there is a gap area between the second reverse collection image area at the upper right end and the second forward collection image area at the lower right end; that is, there is a missed detection area; Figure 17 Conveying length of medium cloth The degree L2 is equal to the longitudinal detection distance H of the field of view, and the length L3 of the second overlapping area is equal to the width WB of the cloth, but the rightmost end of the second overlapping area has only one endpoint. At this time, the second reverse collection image area above the rightmost end There is just no gap area with the second forward collection image area at the lower right end; however, since there is also detection of the reverse side of the cloth, further explanation is given, as shown in Figure 19. Figure 19 shows the first cycle of the journey. Schematic diagram of the intersection of the second reverse set image area and the second forward set image area in the second cycle. In the first cycle, the upper boundary of the second reverse set image area that does not overlap is the The upper boundary line of the second reverse collective image area of the periodic stroke, and its lower boundary is the upper boundary line of the second forward collective image area of the periodic stroke. Since the viewing field of view of the camera module 53 is in the form of a block diagram, Therefore, the lower boundary line of the second forward set image area of the second periodic stroke will be lower than the upper boundary line of the second forward set image area of the first periodic stroke. Correspondingly, as shown in Figure 20, Figure 20 is The intersection of the first periodic trip set image area and the second periodic trip set image area, where the set image area refers to the second forward set image area and the second reverse set image in the periodic trip The accumulation of areas, the lower boundary line of the second overlapping area of the second periodic trip is lower than the upper boundary line of the reverse set area of the first periodic trip, that is, the second forward set image area of the second periodic trip can cover the first periodic trip. The second reverse set image area that does not overlap in one cycle will basically not miss detection; in Figure 18, the conveying length L2 of the cloth is less than the longitudinal detection distance H of the field of view, and the length L3 of the second overlapping area is equal to the width WB of the cloth , and there are two endpoints at the rightmost end of the second overlapping area. At this time, there is no gap area between the second reverse set image area at the upper right end and the second forward set image area at the lower right end, and the second The area of the overlapping area is larger than the area of the second overlapping area in Figure 17. Similarly, the second forward set image area of the second periodic trip can cover the second reverse set image area of the first periodic trip that does not overlap; that is, at least Ensure that the length L3 of the second overlapping area can cover the width WB of the cloth, and there will be basically no leakage. Inspection is also applicable in this embodiment.

T3。此外，攝像模組53的幀率FR確定，請參考實施例一布匹檢測方法中的對應部分，在此不再贅述。 As for the coordination of various parameters such as the running speed V1 of the cloth roller 4 and the slip cycle time T2, please refer to the corresponding part of the first embodiment. The control system controls the slip cycle time T2 of the camera module 53, which further includes: The preset running speed V1 of the cloth rolling roller 4, the longitudinal detection distance H of the field of view of the camera module 53, the time for acquiring the cloth passing the longitudinal detection distance H of the field of view T3 = H/V1, and the slip cycle time T2

T3. In addition, to determine the frame rate FR of the camera module 53, please refer to the corresponding part of the cloth detection method in Embodiment 1, which will not be described again here.

The above discussions are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention; therefore, equivalent changes in shape, structure or combination should be made without departing from the spirit and scope of the present invention. are covered by the patent scope of this invention.

1:Rack

2: The first rubber roller group

3: Second rubber roller group

4: Cloth rolling roller

5:Image acquisition module

X: direction

Y: direction

Claims (13)

A cloth detection device for an open-width cloth rolling machine, which includes: A cloth cutting device and a winding device. The cloth cutting device is used to cut and unfold the annular cloth woven by the circular knitting machine. The winding device includes a frame, and the first rubber roller group is arranged parallel to the frame. With the second rubber roller group, a cloth rolling roller is provided on one side of the second rubber roller group. The cut and unfolded cloth is straightened and smoothed by the first rubber roller group and the second rubber roller group in sequence, and is finally Winding up on the cloth rolling roller, there is an image acquisition module and a control system. The image acquisition module includes a guide part, a driving part and a camera module. The driving part and the camera module are electrically connected to the control system externally. The guide includes a guide rail and a slide block. The guide rail is arranged on the frame and is suspended across the transmission surface constructed by the discharge end of the first rubber roller group and the feed end of the second rubber roller group. The driving member drives the slider to reciprocate and slide in forward and reverse directions along the length of the guide rail. The camera module is arranged on the slider, and the camera module is equipped with a lens. The lens of the camera module faces the transmission surface. To carry out image collection, the control system is at least used to receive the real-time image information collected by the camera module, and compare and analyze the real-time image information with its preset sample image, so as to determine the cloth located on the transmission surface. Whether there are defects, when the control system determines that the transmitted cloth is defective, it will send control instructions to the outside. The cloth detection device for an open-width cloth winding machine as described in claim 1, wherein the guide rail is arranged parallel to the first rubber roller group, and the lens of the camera module is arranged above the direction perpendicular to the front direction of the cloth. The cloth detection device for an open-width cloth rolling machine as described in claim 2, wherein the image acquisition module is located between the transmission surface and the cloth rolling roller. The cloth detection device for an open-width cloth rolling machine as described in claim 1, wherein the camera module is provided with at least two first light sources at the outer diameter end of the lens, and a light guide is added at the outer periphery of the first light source. The side wall of the light guide cover is used to project the light paths of a plurality of first light sources directly in front of the lens of the camera module. The cloth detection device for an open-width cloth rolling machine as described in any one of claims 1-4, wherein the image acquisition module further includes a light shielding member, which is arranged on the frame and faces the lens of the camera module. It is provided that the light-shielding member has a light-shielding body that matches the width of the cloth, and the light-shielding body is arranged parallel to the guide rail, and at least the lens of the camera module corresponds to the light-shielding body at a corresponding position in the effective viewing area memory. The cloth detection device for an open-width cloth rolling machine as described in claim 5, wherein the light-shielding body has a groove, and at least a plurality of second light sources are provided in the groove, and the second light source is electrically connected to the control system , only when the camera module is used to collect images from the reverse side of the cloth, the control system issues a control instruction to light up the second light source. The cloth detection device for an open-width cloth rolling machine as described in claim 5 or 6, wherein the light-shielding member is configured to be movablely connected to the frame for position adjustment, at least when the light-shielding member is in the first position, It is located in the effective viewing area corresponding to the lens of the camera module; when the light shield is in the second position, it moves away from the effective viewing area corresponding to the lens of the camera module, making it easier for workers to move from the first rubber roller set to the second rubber roller. The team carries out cloth placement work. The cloth detection device for an open-width cloth rolling machine as described in claim 7, wherein the light-shielding member further includes two side plates, the light-shielding body is disposed between the two side plates, and one end of the side plate is arranged on the machine. The rotating shaft of the frame is rotatably pivoted to the frame, and a connected opening slot is provided at the junction between the light-shielding body and the side plate. The opening on the light-shielding body is larger than the opening on the side plate. The frame is provided with The fastener penetrates the opening slot and presses the side plate against the frame, so that the light shielding member is fixed in the first position. The cloth detection device for an open-width cloth rolling machine as described in claim 8, wherein a first limiting member and a second limiting member are respectively provided on the frame, and the first limiting member and the second limiting member are The position members are respectively positioned against both sides of the side plate so that the light-shielding member switches between the first position and the second position with the rotating shaft as the rotation axis. The cloth detection method for an open-width cloth rolling machine as described in any one of claims 1-4, includes the following steps: S1: Within the scheduled execution time, based on the preset running speed of the cloth roller, the cloth is conveyed from the first rubber roller group to the second rubber roller group, and the slip cycle time of the camera module is controlled through the control system, so The sliding cycle time is defined as the time for the camera module to go through the cumulative forward sliding stroke and reverse sliding stroke from one end of the guide rail to the other end. When the camera module is equipped with a first light source, the first light source must be at least It is guaranteed to remain on when the lens is in working condition. When the camera module is in the forward sliding stroke, the effective viewing areas of the forward sliding stroke collected through the camera module are superimposed on each other to form the first forward collective image area. The camera module is in the reverse sliding stroke, and the effective viewing areas of the reverse sliding stroke collected by the camera module are superimposed on each other to form the first reverse collective image area, the first forward collective image area and the first reverse The overlapping portion of the collective image areas is the first overlapping area, which at least ensures that the first overlapping area can basically cover the entire length of the cloth being conveyed downward; S2: Transmit the real-time cloth image collected by the camera module to the control system; S3: The control system has a sample image and threshold preset, analyzes and compares the sample image with the cloth image collected in real time, calculates the similarity between the real time cloth image and the sample image, and compares the similarity The degree value is compared with the threshold. If the sample image stored in the control system is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the result of the real-time cloth image analysis is qualified. Volume The cloth machine continues to run. If the similarity value after analysis and comparison of the cloth image collected in real time is less than the threshold, the real-time cloth image analysis result will be unqualified, and the cloth rolling machine will stop and alarm. If the sample image stored in the control system is unqualified Qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the result of the real-time cloth image analysis is unqualified, and the cloth rolling machine will stop and alarm. If the final similarity value is less than the threshold, the instant cloth image analysis result is qualified and the cloth rolling machine continues to run. The cloth detection method for an open-width cloth rolling machine as described in any one of claims 6-9, includes the following steps: S1: Within the scheduled execution time, based on the preset running speed of the cloth roller, the cloth is conveyed from the first rubber roller group to the second rubber roller group, and the slip cycle time of the camera module is controlled through the control system, so The sliding cycle time is defined as the time for the camera module to go through the accumulated stroke of forward sliding stroke and reverse sliding stroke from one end of the guide rail to the other end. When the camera module is in the forward sliding stroke, and the camera module When the first light source is provided, the first light source is turned on, and the second light source is turned off at the same time, and the effective viewing areas of the forward sliding stroke collected by the camera module are superimposed on each other to form a second forward collective image area. When the camera module The group is in the reverse sliding stroke, the first light source of the camera module is turned off, the second light source of the light-shielding body is turned on, and the effective viewing areas of the reverse sliding stroke collected by the camera module are superimposed on each other to form the second reverse direction The overlapping portion of the collection image area, the second forward collection image area and the second reverse collection image area is the second overlapping area, which at least ensures that the second overlapping area can basically carry out the area of the cloth sliding downward. full coverage; S2: Transmit the real-time cloth image collected by the camera module to the control system; S3: The control system has preset sample images and thresholds, analyzes and compares them with the immediately collected cloth images, calculates the similarity value between the real-time cloth image and the sample image, and compares the similarity value with If the sample image stored in the control system is a qualified sample image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the real-time cloth image analysis result is qualified, and the cloth rolling machine continues Run, if the similarity value after analysis and comparison of the cloth image collected in real time is less than the threshold, the result of the real-time cloth image analysis is unqualified, and the cloth rolling machine will stop and alarm. If the sample image stored in the control system is an unqualified sample image Image: If the similarity value after analysis and comparison of the cloth image collected in real time is greater than the threshold, the result of the real-time cloth image analysis is unqualified, and the cloth rolling machine will stop and alarm. If the similarity value of the cloth image collected in real time after analysis and comparison is If the degree value is less than the threshold, the instant cloth image analysis result is qualified and the cloth rolling machine continues to run. The cloth detection method for an open-width cloth rolling machine as described in claim 10 or 11, wherein the slip cycle time of the camera module is controlled through a control system, further comprising: Based on the preset running speed V1 of the cloth roller, the longitudinal detection distance H of the camera module's field of view, the time to obtain the cloth passing the longitudinal detection distance H of the field of view T3 = H/V1, and the slip cycle time T2

T3. The cloth detection method for an open-width cloth rolling machine as described in claim 12, wherein the frame rate FR of the camera module is obtained based on the cloth width WB, the field of view lateral detection distance W of the camera module, and the slip cycle time T2 , FR is a positive integer, and FR

2WB/(W*T2).

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