A device and method for testing the flatness of knitted fabrics

Abstract

This application relates to a device and method for detecting the flatness of knitted fabrics, comprising a detection table, an unwinding roller, and a winding roller; a dark chamber disposed on the detection table; an electrostatic loading system for applying pulsed electrostatic charge to the fabric to be tested before entering the dark chamber; and the following components disposed within the dark chamber: a conductive light-transmitting plate; a light-transmitting lamp disposed below the conductive light-transmitting plate; a perforated plate disposed above the fabric to be tested on the conductive light-transmitting plate, having an array of perforations on it; a matte imaging plate disposed above the perforated plate; and an industrial camera for capturing the light spot image of the matte imaging plate and transmitting it to an image processing system, which identifies the light spot image and determines flatness defects. This application utilizes the electrostatic loading system to apply charge to the fabric to be tested, which reduces surface dynamic disturbance during fabric transmission and enhances the uniformity of surface charge distribution. Furthermore, by using the perforated plate to magnify fabric defects, it significantly improves the efficiency and accuracy of flatness defect identification.

Description

Technical Field

[0001] This application relates to the technical field of fabric testing, and in particular to a device and method for testing the flatness of knitted fabrics. Background Technology

[0002] Knitted fabrics are woven fabrics created by bending yarns into loops and interlocking them using knitting needles. Based on yarn material, they can be categorized into cotton knitted fabrics, polyester knitted fabrics, blended knitted fabrics, and specialty synthetic fiber fabrics. Among these, blended knitted fabrics are the most widely used in sportswear due to their excellent breathability, sweat absorption, and appropriate elasticity. However, because of the different properties of the yarns in blended knitted fabrics, they are prone to uneven shrinkage during processing or storage, affected by environmental temperature and humidity. This can lead to wrinkles or wavy deformation, affecting the fabric's smoothness. Therefore, it is necessary to test the smoothness of knitted fabrics after production or before garment processing.

[0003] Chinese patent application CN202111211626.3, in the related technology, proposes a device and method for detecting the flatness of knitted fabrics. The device includes a base plate, a first support plate, a second support plate, a driven wheel, a driving wheel, a connecting shaft, a transition plate, a widening plate, a fabric shaft, a support shaft, a cantilever plate, a motor, a connecting belt, and a frame plate. A middle plate is fixedly connected to the front center of the frame plate, and a first electric push rod is installed at the top of the middle plate. A linkage plate is fixedly connected to the output shaft end of the first electric push rod. An image recognition device is fixedly connected to the bottom end of the middle plate. A clearance hole is provided in the middle of the linkage plate. First connecting plates are rotatably connected to the left and right sides of the linkage plate. A pressure shaft is rotatably connected to the bottom of the first connecting plate via a shaft. A spring is connected to the middle of the first connecting plate, and the other end of the spring is connected to a second connecting plate. A receiving device is provided at the top center of the base plate, and a control panel is installed at the top of the frame plate. The image recognition device and the motor are electrically connected to the control panel. The device boasts high detection efficiency and accuracy.

[0004] However, blended knitted fabrics inherently possess a certain degree of elasticity. When performing flattening tests on blended knitted fabrics, excessive stretching or insufficient flattening force can cause fabric deformation, leading to highly inaccurate test results. Although the aforementioned solution uses elastically designed pressure rollers to improve fabric conformity, the fabric will inevitably vibrate during the unwinding and winding process due to fluctuations in the conveyor equipment. This results in a persistent error in the fabric flatness test results. Furthermore, because blended fabrics have a delicate texture, ordinary industrial cameras struggle to accurately identify flatness defects, which also leads to inaccurate fabric flatness test results. Summary of the Invention

[0005] To address the issue of low accuracy in flatness testing results for blended fabrics due to transmission fluctuations and inherent fabric characteristics, this application provides a flatness testing device and method for knitted fabrics.

[0006] The technical solution of the device and method for detecting the flatness of knitted fabrics provided in this application is as follows:

[0007] The first aspect of this application provides a knitted fabric flatness testing device, which adopts the following technical solution:

[0008] A device for detecting the flatness of knitted fabrics includes a testing platform with a testing port extending through it. The testing platform is equipped with:

[0009] The unwinding roller and the take-up roller are located on both sides of the testing table and are used to transfer the fabric to be tested.

[0010] A dark box, set on a testing platform and covering the testing opening, has an inlet and an outlet on opposite sides for the fabric to be tested to pass through; and

[0011] An electrostatic loading system is used to apply pulsed static electricity to the fabric to be tested before it enters the dark chamber.

[0012] The dark box is equipped with:

[0013] A conductive light-transmitting plate is installed at the detection port;

[0014] A light-transmitting lamp is located below the conductive light-transmitting plate;

[0015] A perforated plate is placed above the fabric to be tested on a conductive and light-transmitting plate, and an array of perforations are formed on it.

[0016] A matte imaging plate is disposed above the perforated plate; and

[0017] An industrial camera is used to capture images of light spots on a matte display panel and transmit them to an image processing system, which is used to identify the light spot images and determine flatness defects.

[0018] Furthermore, the aperture of the perforated plate is 0.2-0.5 mm, the array spacing is 1-3 mm, and the straight-line distance between the perforated plate and the conductive light-transmitting plate is less than the straight-line distance between the perforated plate and the matte imaging plate.

[0019] Furthermore, the electrostatic loading system includes:

[0020] A metal rod is insulated and installed on the testing platform and grounded separately, and the distance between it and the fabric to be tested transmitted on the testing platform is controlled to be 1-3 mm;

[0021] A pulsed electrostatic generator is used to apply pulsed electrostatics to the metal rod.

[0022] Furthermore, the metal rod is covered with an insulating sleeve, and an electrical notch is provided on the side of the insulating sleeve near the testing platform, which is arranged along the length of the metal rod. The length of the electrical notch is not less than the width of the fabric to be tested.

[0023] Furthermore, the metal rod is inclined along the transmission direction of the fabric to be tested.

[0024] Furthermore, the inner wall of the darkroom is provided with a metal shielding mesh, which is independently grounded from the conductive light-transmitting plate. The conductive light-transmitting plate is insulated and installed on the detection platform.

[0025] Furthermore, an ion air bar is provided on the detection platform, and the ion air bar is located on the side near the outlet of the dark box.

[0026] Furthermore, the testing platform is also equipped with two guide rollers arranged on both sides of the dark box. The fabric to be tested is guided by the two guide rollers and then adheres to the surface of the testing platform.

[0027] Furthermore, the perforated plate is slidably disposed within the dark box, and the dark box is provided with a linear drive component for driving the perforated plate closer to or further away from the conductive light-transmitting plate.

[0028] The second aspect of this application provides a method for detecting the flatness of knitted fabrics, which adopts the following technical solution:

[0029] A method for detecting the flatness of knitted fabrics, based on the aforementioned knitted fabric flatness detection device, includes the following steps:

[0030] The fabric to be tested is unwound from the unwinding roller, enters through the inlet of the dark box and exits through the outlet, and is then wound up on the winding roller.

[0031] The electrostatic loading system applies pulsed static electricity to the fabric to be tested before it enters the dark chamber, so that the fabric to be tested fits tightly against the detection table and the conductive light-transmitting plate during the process of passing through the dark chamber, and fixes the fiber position on the fabric to be tested, reducing the light spot noise caused by fiber floating or slipping.

[0032] When the fabric under test passes through the dark box, the light emitted by the light-transmitting lamp passes through the fabric under test and is imaged through multiple small holes on the perforated plate, forming an inverted and magnified light spot on the matte imaging plate.

[0033] The industrial camera captures the spot image on the matte display panel and transmits it to the image processing system, which identifies the spot image and determines flatness defects.

[0034] In summary, the beneficial technical effects of this application are as follows:

[0035] 1. By applying a charge to the fabric under test using an electrostatic loading system, the gap between the fabric and the conductive light-transmitting plate can be reduced to approximately 5 μm. Compared to the 50–200 μm gap of conventional vacuum adsorption, electrostatic adsorption significantly reduces surface dynamic disturbances during the fabric's transmission on the conductive light-transmitting plate, improving the accuracy of industrial cameras in capturing flatness defects in the fabric. Furthermore, the natural curling or entanglement of fibers in knitted fabrics may interfere with the detection signal; applying electrostatics can cause the fibers of the fabric to tend to align, reducing noise interference from non-target structures. Simultaneously, applying electrostatics can also enhance the uniformity of surface charge distribution on the fabric, assisting the detection device in more quickly identifying local deformations or pores, thus improving the efficiency and accuracy of flatness defect identification.

[0036] 2. By setting up a dark box, the interference of ambient light on the light spot on the matte display plate can be reduced, ensuring the clarity of the light spot on the matte display plate and facilitating rapid identification by industrial cameras and image processing systems. Moreover, by setting a perforated plate closer to the fabric under test between the fabric and the matte display plate, the light passing through the fabric under test is imaged through multiple small holes in the perforated plate, resulting in an enlarged light spot on the matte display plate. This means that defects on the fabric under test can be magnified, eliminating the need for a high-precision industrial camera and complex image processing system algorithms. This is more conducive to rapid identification by industrial cameras and image processing systems and can improve the accuracy of the flatness detection results of the fabric under test.

[0037] 3. By opening multiple ventilation holes through the part of the test plate near the conductive light-transmitting plate, the air that may remain between the test fabric and the test table can be discharged after the fabric to be tested is tightly attached to the test table surface under the electrostatic adsorption, so as to ensure a good adhesion effect between the test fabric and the conductive light-transmitting plate.

[0038] 4. By raising and lowering the perforated plate inside the dark chamber, the position of the perforated plate between the fabric to be tested and the matte imaging plate can be precisely adjusted. Before testing, the position of the perforated plate can be adjusted so that the light spot image on the matte imaging plate is as clear as possible before the formal test, which can improve the accuracy of the flatness test results of knitted fabrics. Similarly, it can also be applied to the flatness test of fabrics of different materials and thicknesses. Attached Figure Description

[0039] Figure 1 This is a cross-sectional view of the overall structure of an embodiment of this application;

[0040] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Testing platform; 11. Testing port; 12. Conductive light-transmitting plate;

[0043] 21. Unwinding roll; 22. Rewinding roll;

[0044] 3. Dark box; 31. Import; 32. Export; 33. Metal shielding mesh;

[0045] 41. Transmitting light; 42. Perforated plate; 43. Matte developing plate; 44. Industrial camera;

[0046] 5. Metal rod; 51. Insulating sheath; 511. Power-on notch;

[0047] 6. Ionizing air bar;

[0048] 7. Guide rollers;

[0049] 8. Fabric to be tested. Detailed Implementation

[0050] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] This application discloses a device for detecting the flatness of knitted fabrics. (Refer to...) Figure 1 It includes a testing table 1, with a testing port 11 extending through the testing table 1. The testing table 1 is made of metal or has a smooth stainless steel plate attached to its surface to reduce wear on the knitted fabric during transmission. The table surface of the testing table 1 is grounded separately.

[0052] The testing station 1 is equipped with:

[0053] The unwinding roller 21 and the take-up roller 22 are respectively located on both sides of the testing table 1 and are used to transport the fabric 8 to be tested; the two are arranged in parallel and the testing table 1 is equipped with a power motor that drives the two to rotate synchronously.

[0054] The dark box 3 is set on the testing table 1 and covers the testing port 11. It has an inlet 31 and an outlet 32 ​​on opposite sides for the fabric 8 to be tested to pass through. Specifically, the dark box 3 is a sealed box with an internal light-absorbing coating to reduce interference from external ambient light. Furthermore, the dark box 3 is equipped with flexible light-shielding components at both the inlet 31 and the outlet 32, such as densely overlapping rubber strips or bristles.

[0055] An electrostatic loading system is used to apply pulsed static electricity to the fabric 8 to be tested, which is about to enter the dark chamber 3.

[0056] The dark box 3 contains:

[0057] The conductive light-transmitting plate 12 is installed at the detection port 11 and is insulated from the detection stage 1. Its upper surface is flush with the table surface of the detection stage 1 or protrudes from the table surface of the detection stage 1. If it protrudes, a transition curved surface or transition slope is provided at the junction of the two. The conductive light-transmitting plate 12 can be ITO coated glass or an acrylic plate with a conductive film or nano-metal mesh on its upper surface. The conductive structure of the conductive light-transmitting plate 12 is grounded separately through a copper strip.

[0058] A light-transmitting lamp 41 is located below the conductive light-transmitting plate 12. It is a planar light source formed by high-brightness LED beads, and the light it projects can be white, red, or green. When the fabric 8 to be tested is a dark or high-density fabric, a floodlight that projects red or green light is required. If necessary, a light guide can also be set between the light-transmitting lamp 41 and the conductive light-transmitting plate 12 to ensure that the light from the light-transmitting lamp 41 shines directly onto the fabric 8 to be tested on the conductive light-transmitting plate 12.

[0059] A perforated plate 42 is placed on the conductive and light-transmitting plate 12 above the fabric 8 to be tested. Small holes are arranged in an array on the plate. The diameter of the small holes on the perforated plate 42 is 0.2 to 0.5 mm and the array spacing is 1 to 3 mm.

[0060] The matte display plate 43 is positioned above the perforated plate 42. It can be a high-contrast matte white plate or a coated acrylic plate. The straight-line distance between the perforated plate 42 and the conductive light-transmitting plate 12 is smaller than the straight-line distance between the perforated plate 42 and the matte display plate 43, so as to achieve a proportional magnification effect of the light spot transmitted on the matte display plate 43.

[0061] An industrial camera 44 is used to capture the light spot image of the matte display panel 43 and transmit it to an image processing system. The image processing system is used to identify the light spot image and determine flatness defects. The image processing system is existing technology and can be fully implemented by those skilled in the art, so it needs no further explanation. Furthermore, the installation position of the industrial camera 44 can be adjusted depending on the material of the matte display panel 43. For example, if the matte display panel 43 is an opaque, high-contrast matte white board, the industrial camera 44 is positioned diagonally below the matte display panel 43, capturing the light spot pattern on the lower surface of the matte display panel 43 at an angle; if the matte display panel 43 is a translucent coated acrylic board, the industrial camera 44 is positioned directly above the matte display panel 43, capturing the light spot pattern transmitted through the matte surface of the matte display panel 43 in a forward direction.

[0062] Therefore, when testing the flatness of knitted fabrics, the unwinding roller 21 and the take-up roller 22 can be used to unwind and rewind the fabric 8 to be tested, and make the fabric 8 initially adhere to the test table 1 and the upper surface of the conductive light-transmitting plate 12. At the same time, the electrostatic loading system applies pulsed static electricity to the fabric 8 to be tested before it enters the dark box 3, so that the fabric 8 to be tested adheres tightly to the grounded test table 1 and the conductive light-transmitting plate 12 by means of electrostatic adsorption during the process of passing through the dark box 3. This can eliminate local relaxation caused by gravity or transmission tension, and ensure that there is no dynamic disturbance on the surface of the fabric 8 to be tested during light transmission imaging. In addition, the fabric 8 to be tested after being loaded with static electricity can also fix the position of the fibers on the fabric 8 to be tested, reduce the spot noise caused by the floating or slipping of fibers during the transmission of the fabric 8 to be tested, and ensure the clarity of the spot image on the imaging plate.

[0063] Therefore, when the fabric 8 under test passes through the dark box 3, the direct light emitted by the light-transmitting lamp 41 passes through the fabric 8 under test and is imaged by multiple small holes on the perforated plate 42, forming an inverted and magnified light spot on the matte imaging plate 43. This light spot corresponds to the micropore distribution characteristics on the fabric 8 under test. The industrial camera 44 captures the light spot image on the matte imaging plate 43 and transmits it to the image processing system. The image processing system identifies the light spot image and determines the flatness defect. For example, when the light spot on the matte imaging plate 43 appears as a striped or distorted light spot with blurred edges, it indicates that the fabric 8 under test has wrinkles, indicating poor flatness. When the light spot on the matte imaging plate 43 appears as a wavy light spot with blurred edges, it indicates that the fabric 8 under test has wavy deformation, indicating poor flatness. When the light spot on the matte imaging plate 43 appears as a regular light spot with clear edges and uniform distribution, it indicates that the fabric 8 under test has good flatness. Of course, if the light spot presents other shapes or characteristics, it can also correspond to other defects in the fabric being tested. The basis for judgment is conventional technology and will not be elaborated here.

[0064] Therefore, with the above setup, the smoothness of knitted fabrics can be effectively detected. Furthermore, by applying a charge to the fabric 8 under test through the electrostatic loading system, the gap between the fabric 8 under test and the conductive light-transmitting plate 12 can be reduced to about 5μm. Compared with the 50-200μm gap of the conventional vacuum adsorption method, the electrostatic adsorption method can significantly reduce the surface dynamic disturbance of the fabric 8 under test during its transmission on the conductive light-transmitting plate 12, thereby improving the capture accuracy of the industrial camera 44 for the smoothness defects of the fabric 8 under test. Moreover, the natural curling or entanglement of fibers in knitted fabrics may interfere with the detection signal. After applying electrostatics, the fibers of the fabric 8 under test tend to be oriented, reducing noise interference from non-target structures. At the same time, applying electrostatics can also enhance the uniformity of the surface charge distribution of the fabric 8 under test, which can help the detection device to more quickly identify local deformations or pores, thereby improving the efficiency and accuracy of smoothness defect identification.

[0065] Furthermore, by setting up the dark box 3, the interference of ambient light on the light spot on the matte imaging plate 43 can be reduced, ensuring the clarity of the light spot on the matte imaging plate 43 and facilitating rapid identification by the industrial camera 44 and the image processing system. Moreover, by setting a perforated plate 42 closer to the fabric 8 under test between the fabric 8 under test and the matte imaging plate 43, the light passing through the fabric 8 under test is imaged by multiple small holes on the perforated plate 42 and then appears as an enlarged light spot on the matte imaging plate 43. This means that defects on the fabric 8 under test can be magnified, eliminating the need for a high-precision industrial camera 44 and a complex image processing system algorithm. This is more conducive to rapid identification by the industrial camera 44 and the image processing system, and can improve the accuracy of the flatness detection results of the fabric 8 under test.

[0066] In another feasible embodiment, multiple ventilation holes can be opened through the part of the detection plate near the conductive light-transmitting plate 12 so that after the fabric to be tested 8 is tightly attached to the table surface of the detection stage 1 under the electrostatic adsorption, the air that may remain between the fabric to be tested 8 and the detection stage 1 can be discharged to ensure a good adhesion effect between the fabric to be tested 8 and the conductive light-transmitting plate 12.

[0067] In addition, the aforementioned electrostatic loading system includes:

[0068] A metal rod 5 is insulated and mounted on the testing platform 1 and grounded independently. The distance between the metal rod 5 and the fabric 8 to be tested being transported on the testing platform 1 is controlled to be 1-3 mm. The metal rod 5 is covered with an insulating sleeve 51, which can be a PTFE sleeve. An electrical notch 511 is provided on the side of the insulating sleeve 51 closest to the testing platform 1, which is set along the length of the metal rod 5. The length of the electrical notch 511 is not less than the width of the fabric 8 to be tested. Moreover, the metal rod 5 can be set perpendicular to the transmission direction of the fabric 8 to be tested, or it can be set at an angle along the transmission direction of the fabric 8 to be tested, so as to adjust the electric field distribution between the metal rod 5 and the fabric 8 to be tested, so that the electric field lines cover the surface of the fabric 8 to be tested more evenly and reduce edge effects.

[0069] A pulsed electrostatic generator is used to apply pulsed electrostatics to the metal rod 5.

[0070] Furthermore, to prevent the fabric 8 to be tested from being affected by static electricity after being charged, an ion air bar 6 is installed on the testing table 1. The ion air bar 6 is located on the side near the outlet 32 ​​of the dark box 3, and its working end points towards the fabric 8 to be tested on the testing table 1.

[0071] Therefore, when the pulsed electrostatic generator is started, discharge occurs through the metal rod 5. The insulating sleeve 51 restricts the discharge direction of the metal rod 5 to ensure that the electrostatic energy is accurately applied to the fabric 8 under test. When the fabric 8 under test is tested in the dark box 3 and output from the outlet 32, the ion wind rod 6 blows ion wind at high speed onto the fabric 8 under test to neutralize the charge on the fabric 8 under test, thereby eliminating static electricity and facilitating subsequent processing steps.

[0072] In addition, as an adaptation, the testing table 1 is also equipped with two guide rollers 7 arranged on both sides of the dark box 3. The fabric to be tested 8 is guided by the two guide rollers 7 and then adheres to the table surface of the testing table 1. The setting of the guide rollers 7 can make the fabric to be tested 8, which is continuously unwound and rewound, as flat as possible and adhere to the testing table 1. This makes it convenient for the metal rod 5 to apply static electricity to the fabric to be tested 8, so that the fabric to be tested 8 can adhere tightly to the testing table 1 and the upper surface of the conductive light-transmitting plate 12.

[0073] Furthermore, the perforated plate 42 is slidably disposed inside the dark box 3. The dark box 3 is provided with a linear drive component (not shown in the figure) for driving the perforated plate 42 closer to or further away from the conductive light-transmitting plate 12. The linear drive component can be a high-precision linear drive device such as a linear motor, electric push rod, or ball screw. It can precisely adjust the position of the perforated plate 42 between the fabric 8 to be tested and the matte imaging plate 43 so that when testing fabrics 8 of different materials and thicknesses, the position of the perforated plate 42 is first adjusted so that the light spot image on the matte imaging plate 43 is as clear as possible before the formal test is performed.

[0074] This application discloses a method for detecting the flatness of knitted fabrics, based on the aforementioned knitted fabric flatness detection device, with reference to... Figure 1 It includes the following steps:

[0075] The fabric to be tested 8 is unwound from the unwinding roller 21, enters through the inlet 31 on the dark box 3, exits through the outlet 32, and is wound up on the take-up roller 22.

[0076] The electrostatic loading system applies pulsed static electricity to the fabric 8 to be tested before entering the dark chamber 3, so that the fabric 8 to be tested will adhere tightly to the test stage 1 and the conductive light-transmitting plate 12 by means of electrostatic adsorption during the process of passing through the dark chamber 3, and fix the fiber position on the fabric 8 to reduce the light spot noise caused by fiber floating or slipping.

[0077] When the fabric under test 8 passes through the dark box 3, the light emitted by the light-transmitting lamp 41 passes through the fabric under test 8 and is imaged by multiple small holes on the perforated plate 42, forming an inverted and magnified light spot on the matte imaging plate 43.

[0078] The industrial camera 44 captures the spot image on the matte display panel 43 and transmits it to the image processing system. The image processing system identifies the spot image and determines the flatness defect.

[0079] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0080] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. 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formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed through the detection table, and a detection port being formed ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ 3. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ ​ ​ 4. The device for detecting the flatness of a knitted fabric according to claim 3, wherein ​ 5. The device for detecting the flatness of a knitted fabric according to claim 3, wherein ​ 6. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ 7. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ 8. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ 9. The device for detecting the flatness of a knitted fabric according to claim 1, wherein ​ 10. A method for detecting the flatness of a knitted fabric based on the knitted fabric flatness detection device according to any one of claims 1-9, characterized in that, ​ ​ ​ ​ ​

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